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gecko/view/src/nsViewManager.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Patrick C. Beard <beard@netscape.com>
* Kevin McCluskey <kmcclusk@netscape.com>
* Robert O'Callahan <roc+@cs.cmu.edu>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1)
#include "plarena.h"
#include "nsAutoPtr.h"
#include "nsViewManager.h"
#include "nsUnitConversion.h"
#include "nsIRenderingContext.h"
#include "nsIDeviceContext.h"
#include "nsGfxCIID.h"
#include "nsIScrollableView.h"
#include "nsView.h"
#include "nsISupportsArray.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsGUIEvent.h"
#include "nsIPrefBranch.h"
#include "nsIPrefService.h"
#include "nsRegion.h"
#include "nsInt64.h"
#include "nsScrollPortView.h"
#include "nsHashtable.h"
#include "nsCOMArray.h"
#include "nsThreadUtils.h"
#include "gfxContext.h"
static NS_DEFINE_IID(kBlenderCID, NS_BLENDER_CID);
static NS_DEFINE_IID(kRegionCID, NS_REGION_CID);
static NS_DEFINE_IID(kRenderingContextCID, NS_RENDERING_CONTEXT_CID);
/**
XXX TODO XXX
DeCOMify newly private methods
Optimize view storage
*/
/**
A note about platform assumptions:
We assume all native widgets are opaque.
We assume that a widget is z-ordered on top of its parent.
We do NOT assume anything about the relative z-ordering of sibling widgets. Even though
we ask for a specific z-order, we don't assume that widget z-ordering actually works.
*/
#define NSCOORD_NONE PR_INT32_MIN
#ifdef NS_VM_PERF_METRICS
#include "nsITimeRecorder.h"
#endif
//-------------- Begin Invalidate Event Definition ------------------------
class nsInvalidateEvent : public nsViewManagerEvent {
public:
nsInvalidateEvent(nsViewManager *vm) : nsViewManagerEvent(vm) {}
NS_IMETHOD Run() {
if (mViewManager)
mViewManager->ProcessInvalidateEvent();
return NS_OK;
}
};
//-------------- End Invalidate Event Definition ---------------------------
static PRBool IsViewVisible(nsView *aView)
{
for (nsIView *view = aView; view; view = view->GetParent()) {
// We don't check widget visibility here because in the future (with
// the better approach to this that's in attachment 160801 on bug
// 227361), callers of the equivalent to this function should be able
// to rely on being notified when the result of this function changes.
if (view->GetVisibility() == nsViewVisibility_kHide)
return PR_FALSE;
}
// Find out if the root view is visible by asking the view observer
// (this won't be needed anymore if we link view trees across chrome /
// content boundaries in DocumentViewerImpl::MakeWindow).
nsIViewObserver* vo = aView->GetViewManager()->GetViewObserver();
return vo && vo->IsVisible();
}
void
nsViewManager::PostInvalidateEvent()
{
NS_ASSERTION(IsRootVM(), "Caller screwed up");
if (!mInvalidateEvent.IsPending()) {
nsRefPtr<nsViewManagerEvent> ev = new nsInvalidateEvent(this);
if (NS_FAILED(NS_DispatchToCurrentThread(ev))) {
NS_WARNING("failed to dispatch nsInvalidateEvent");
} else {
mInvalidateEvent = ev;
}
}
}
#undef DEBUG_MOUSE_LOCATION
PRInt32 nsViewManager::mVMCount = 0;
nsIRenderingContext* nsViewManager::gCleanupContext = nsnull;
// Weakly held references to all of the view managers
nsVoidArray* nsViewManager::gViewManagers = nsnull;
PRUint32 nsViewManager::gLastUserEventTime = 0;
nsViewManager::nsViewManager()
: mMouseLocation(NSCOORD_NONE, NSCOORD_NONE)
, mDelayedResize(NSCOORD_NONE, NSCOORD_NONE)
, mRootViewManager(this)
{
if (gViewManagers == nsnull) {
NS_ASSERTION(mVMCount == 0, "View Manager count is incorrect");
// Create an array to hold a list of view managers
gViewManagers = new nsVoidArray;
}
if (gCleanupContext == nsnull) {
/* XXX: This should use a device to create a matching |nsIRenderingContext| object */
CallCreateInstance(kRenderingContextCID, &gCleanupContext);
NS_ASSERTION(gCleanupContext,
"Wasn't able to create a graphics context for cleanup");
}
gViewManagers->AppendElement(this);
mVMCount++;
// NOTE: we use a zeroing operator new, so all data members are
// assumed to be cleared here.
mDefaultBackgroundColor = NS_RGBA(0, 0, 0, 0);
mHasPendingUpdates = PR_FALSE;
mRecursiveRefreshPending = PR_FALSE;
mUpdateBatchFlags = 0;
}
nsViewManager::~nsViewManager()
{
if (mRootView) {
// Destroy any remaining views
mRootView->Destroy();
mRootView = nsnull;
}
// Make sure to revoke pending events for all viewmanagers, since some events
// are posted by a non-root viewmanager.
mInvalidateEvent.Revoke();
mSynthMouseMoveEvent.Revoke();
if (!IsRootVM()) {
// We have a strong ref to mRootViewManager
NS_RELEASE(mRootViewManager);
}
mRootScrollable = nsnull;
NS_ASSERTION((mVMCount > 0), "underflow of viewmanagers");
--mVMCount;
#ifdef DEBUG
PRBool removed =
#endif
gViewManagers->RemoveElement(this);
NS_ASSERTION(removed, "Viewmanager instance not was not in the global list of viewmanagers");
if (0 == mVMCount) {
// There aren't any more view managers so
// release the global array of view managers
NS_ASSERTION(gViewManagers != nsnull, "About to delete null gViewManagers");
delete gViewManagers;
gViewManagers = nsnull;
// Cleanup all of the offscreen drawing surfaces if the last view manager
// has been destroyed and there is something to cleanup
// Note: A global rendering context is needed because it is not possible
// to create a nsIRenderingContext during the shutdown of XPCOM. The last
// viewmanager is typically destroyed during XPCOM shutdown.
NS_IF_RELEASE(gCleanupContext);
}
mObserver = nsnull;
mContext = nsnull;
}
NS_IMPL_ISUPPORTS1(nsViewManager, nsIViewManager)
nsresult
nsViewManager::CreateRegion(nsIRegion* *result)
{
nsresult rv;
if (!mRegionFactory) {
mRegionFactory = do_GetClassObject(kRegionCID, &rv);
if (NS_FAILED(rv)) {
*result = nsnull;
return rv;
}
}
nsIRegion* region = nsnull;
rv = CallCreateInstance(mRegionFactory.get(), &region);
if (NS_SUCCEEDED(rv)) {
rv = region->Init();
*result = region;
}
return rv;
}
// We don't hold a reference to the presentation context because it
// holds a reference to us.
NS_IMETHODIMP nsViewManager::Init(nsIDeviceContext* aContext)
{
NS_PRECONDITION(nsnull != aContext, "null ptr");
if (nsnull == aContext) {
return NS_ERROR_NULL_POINTER;
}
if (nsnull != mContext) {
return NS_ERROR_ALREADY_INITIALIZED;
}
mContext = aContext;
mRefreshEnabled = PR_TRUE;
mMouseGrabber = nsnull;
return NS_OK;
}
NS_IMETHODIMP_(nsIView *)
nsViewManager::CreateView(const nsRect& aBounds,
const nsIView* aParent,
nsViewVisibility aVisibilityFlag)
{
nsView *v = new nsView(this, aVisibilityFlag);
if (v) {
v->SetPosition(aBounds.x, aBounds.y);
nsRect dim(0, 0, aBounds.width, aBounds.height);
v->SetDimensions(dim, PR_FALSE);
v->SetParent(static_cast<nsView*>(const_cast<nsIView*>(aParent)));
}
return v;
}
NS_IMETHODIMP_(nsIScrollableView *)
nsViewManager::CreateScrollableView(const nsRect& aBounds,
const nsIView* aParent)
{
nsScrollPortView *v = new nsScrollPortView(this);
if (v) {
v->SetPosition(aBounds.x, aBounds.y);
nsRect dim(0, 0, aBounds.width, aBounds.height);
v->SetDimensions(dim, PR_FALSE);
v->SetParent(static_cast<nsView*>(const_cast<nsIView*>(aParent)));
}
return v;
}
NS_IMETHODIMP nsViewManager::GetRootView(nsIView *&aView)
{
aView = mRootView;
return NS_OK;
}
NS_IMETHODIMP nsViewManager::SetRootView(nsIView *aView)
{
nsView* view = static_cast<nsView*>(aView);
NS_PRECONDITION(!view || view->GetViewManager() == this,
"Unexpected viewmanager on root view");
// Do NOT destroy the current root view. It's the caller's responsibility
// to destroy it
mRootView = view;
if (mRootView) {
nsView* parent = mRootView->GetParent();
if (parent) {
// Calling InsertChild on |parent| will InvalidateHierarchy() on us, so
// no need to set mRootViewManager ourselves here.
parent->InsertChild(mRootView, nsnull);
} else {
InvalidateHierarchy();
}
mRootView->SetZIndex(PR_FALSE, 0, PR_FALSE);
}
// Else don't touch mRootViewManager
return NS_OK;
}
NS_IMETHODIMP nsViewManager::GetWindowDimensions(nscoord *aWidth, nscoord *aHeight)
{
if (nsnull != mRootView) {
if (mDelayedResize == nsSize(NSCOORD_NONE, NSCOORD_NONE)) {
nsRect dim;
mRootView->GetDimensions(dim);
*aWidth = dim.width;
*aHeight = dim.height;
} else {
*aWidth = mDelayedResize.width;
*aHeight = mDelayedResize.height;
}
}
else
{
*aWidth = 0;
*aHeight = 0;
}
return NS_OK;
}
NS_IMETHODIMP nsViewManager::SetWindowDimensions(nscoord aWidth, nscoord aHeight)
{
if (mRootView) {
if (IsViewVisible(mRootView)) {
mDelayedResize.SizeTo(NSCOORD_NONE, NSCOORD_NONE);
DoSetWindowDimensions(aWidth, aHeight);
} else {
mDelayedResize.SizeTo(aWidth, aHeight);
}
}
return NS_OK;
}
static void ConvertNativeRegionToAppRegion(nsIRegion* aIn, nsRegion* aOut,
nsIDeviceContext* context)
{
nsRegionRectSet* rects = nsnull;
aIn->GetRects(&rects);
if (!rects)
return;
PRInt32 p2a = context->AppUnitsPerDevPixel();
PRUint32 i;
for (i = 0; i < rects->mNumRects; i++) {
const nsRegionRect& inR = rects->mRects[i];
nsRect outR;
outR.x = NSIntPixelsToAppUnits(inR.x, p2a);
outR.y = NSIntPixelsToAppUnits(inR.y, p2a);
outR.width = NSIntPixelsToAppUnits(inR.width, p2a);
outR.height = NSIntPixelsToAppUnits(inR.height, p2a);
aOut->Or(*aOut, outR);
}
aIn->FreeRects(rects);
}
static nsView* GetDisplayRootFor(nsView* aView)
{
nsView *displayRoot = aView;
for (;;) {
nsView *displayParent = displayRoot->GetParent();
if (!displayParent)
return displayRoot;
if (displayRoot->GetFloating() && !displayParent->GetFloating())
return displayRoot;
displayRoot = displayParent;
}
}
/**
aRegion is given in device coordinates!!
*/
void nsViewManager::Refresh(nsView *aView, nsIRenderingContext *aContext,
nsIRegion *aRegion, PRUint32 aUpdateFlags)
{
NS_ASSERTION(aRegion != nsnull, "Null aRegion");
if (! IsRefreshEnabled())
return;
nsRect viewRect;
aView->GetDimensions(viewRect);
// damageRegion is the damaged area, in twips, relative to the view origin
nsRegion damageRegion;
// convert pixels-relative-to-widget-origin to twips-relative-to-widget-origin
ConvertNativeRegionToAppRegion(aRegion, &damageRegion, mContext);
// move it from widget coordinates into view coordinates
damageRegion.MoveBy(viewRect.x, viewRect.y);
if (damageRegion.IsEmpty()) {
#ifdef DEBUG_roc
nsRect damageRect = damageRegion.GetBounds();
printf("XXX Damage rectangle (%d,%d,%d,%d) does not intersect the widget's view (%d,%d,%d,%d)!\n",
damageRect.x, damageRect.y, damageRect.width, damageRect.height,
viewRect.x, viewRect.y, viewRect.width, viewRect.height);
#endif
return;
}
#ifdef NS_VM_PERF_METRICS
MOZ_TIMER_DEBUGLOG(("Reset nsViewManager::Refresh(region), this=%p\n", this));
MOZ_TIMER_RESET(mWatch);
MOZ_TIMER_DEBUGLOG(("Start: nsViewManager::Refresh(region)\n"));
MOZ_TIMER_START(mWatch);
#endif
NS_ASSERTION(!IsPainting(), "recursive painting not permitted");
if (IsPainting()) {
RootViewManager()->mRecursiveRefreshPending = PR_TRUE;
return;
}
SetPainting(PR_TRUE);
nsCOMPtr<nsIRenderingContext> localcx;
NS_ASSERTION(aView->GetWidget(),
"Must have a widget to calculate coordinates correctly");
if (nsnull == aContext)
{
localcx = CreateRenderingContext(*aView);
//couldn't get rendering context. this is ok at init time atleast
if (nsnull == localcx) {
SetPainting(PR_FALSE);
return;
}
} else {
// plain assignment grabs another reference.
localcx = aContext;
}
PRInt32 p2a = mContext->AppUnitsPerDevPixel();
nsRefPtr<gfxContext> ctx =
(gfxContext*) localcx->GetNativeGraphicData(nsIRenderingContext::NATIVE_THEBES_CONTEXT);
ctx->Save();
nsPoint vtowoffset = aView->ViewToWidgetOffset();
ctx->Translate(gfxPoint(gfxFloat(vtowoffset.x) / p2a,
gfxFloat(vtowoffset.y) / p2a));
ctx->Translate(gfxPoint(-gfxFloat(viewRect.x) / p2a,
-gfxFloat(viewRect.y) / p2a));
nsRegion opaqueRegion;
AddCoveringWidgetsToOpaqueRegion(opaqueRegion, mContext, aView);
damageRegion.Sub(damageRegion, opaqueRegion);
RenderViews(aView, *localcx, damageRegion);
ctx->Restore();
SetPainting(PR_FALSE);
if (RootViewManager()->mRecursiveRefreshPending) {
// Unset this flag first, since if aUpdateFlags includes NS_VMREFRESH_IMMEDIATE
// we'll reenter this code from the UpdateAllViews call.
RootViewManager()->mRecursiveRefreshPending = PR_FALSE;
UpdateAllViews(aUpdateFlags);
}
#ifdef NS_VM_PERF_METRICS
MOZ_TIMER_DEBUGLOG(("Stop: nsViewManager::Refresh(region), this=%p\n", this));
MOZ_TIMER_STOP(mWatch);
MOZ_TIMER_LOG(("vm2 Paint time (this=%p): ", this));
MOZ_TIMER_PRINT(mWatch);
#endif
}
void nsViewManager::DefaultRefresh(nsView* aView, nsIRenderingContext *aContext, const nsRect* aRect)
{
NS_PRECONDITION(aView, "Must have a view to work with!");
nsIWidget* widget = aView->GetNearestWidget(nsnull);
if (! widget)
return;
nsCOMPtr<nsIRenderingContext> context = aContext;
if (! aContext)
context = CreateRenderingContext(*aView);
if (! context)
return;
nscolor bgcolor = mDefaultBackgroundColor;
if (NS_GET_A(mDefaultBackgroundColor) == 0) {
NS_WARNING("nsViewManager: Asked to paint a default background, but no default background color is set!");
return;
}
context->SetColor(bgcolor);
context->FillRect(*aRect);
}
void nsViewManager::AddCoveringWidgetsToOpaqueRegion(nsRegion &aRgn, nsIDeviceContext* aContext,
nsView* aRootView) {
NS_PRECONDITION(aRootView, "Must have root view");
// We accumulate the bounds of widgets obscuring aRootView's widget into opaqueRgn.
// In OptimizeDisplayList, display list elements which lie behind obscuring native
// widgets are dropped.
// This shouldn't really be necessary, since the GFX/Widget toolkit should remove these
// covering widgets from the clip region passed into the paint command. But right now
// they only give us a paint rect and not a region, so we can't access that information.
// It's important to identifying areas that are covered by native widgets to avoid
// painting their views many times as we process invalidates from the root widget all the
// way down to the nested widgets.
//
// NB: we must NOT add widgets that correspond to floating views!
// We may be required to paint behind them
aRgn.SetEmpty();
nsIWidget* widget = aRootView->GetNearestWidget(nsnull);
if (!widget) {
return;
}
for (nsIWidget* childWidget = widget->GetFirstChild();
childWidget;
childWidget = childWidget->GetNextSibling()) {
PRBool widgetVisible;
childWidget->IsVisible(widgetVisible);
if (widgetVisible) {
nsView* view = nsView::GetViewFor(childWidget);
if (view && view->GetVisibility() == nsViewVisibility_kShow
&& !view->GetFloating()) {
nsRect bounds = view->GetBounds();
if (bounds.width > 0 && bounds.height > 0) {
nsView* viewParent = view->GetParent();
while (viewParent && viewParent != aRootView) {
viewParent->ConvertToParentCoords(&bounds.x, &bounds.y);
viewParent = viewParent->GetParent();
}
// maybe we couldn't get the view into the coordinate
// system of aRootView (maybe it's not a descendant
// view of aRootView?); if so, don't use it
if (viewParent) {
aRgn.Or(aRgn, bounds);
}
}
}
}
}
}
void nsViewManager::RenderViews(nsView *aView, nsIRenderingContext& aRC,
const nsRegion& aRegion)
{
if (mObserver) {
nsView* displayRoot = GetDisplayRootFor(aView);
nsPoint offsetToRoot = aView->GetOffsetTo(displayRoot);
nsRegion damageRegion(aRegion);
damageRegion.MoveBy(offsetToRoot);
aRC.PushState();
aRC.Translate(-offsetToRoot.x, -offsetToRoot.y);
mObserver->Paint(displayRoot, &aRC, damageRegion);
aRC.PopState();
}
}
void nsViewManager::ProcessPendingUpdates(nsView* aView, PRBool aDoInvalidate)
{
NS_ASSERTION(IsRootVM(), "Updates will be missed");
// Protect against a null-view.
if (!aView) {
return;
}
if (aView->HasWidget()) {
aView->ResetWidgetBounds(PR_FALSE, PR_FALSE, PR_TRUE);
}
// process pending updates in child view.
for (nsView* childView = aView->GetFirstChild(); childView;
childView = childView->GetNextSibling()) {
ProcessPendingUpdates(childView, aDoInvalidate);
}
if (aDoInvalidate && aView->HasNonEmptyDirtyRegion()) {
// Push out updates after we've processed the children; ensures that
// damage is applied based on the final widget geometry
NS_ASSERTION(mRefreshEnabled, "Cannot process pending updates with refresh disabled");
nsRegion* dirtyRegion = aView->GetDirtyRegion();
if (dirtyRegion) {
UpdateWidgetArea(aView, *dirtyRegion, nsnull);
dirtyRegion->SetEmpty();
}
}
}
NS_IMETHODIMP nsViewManager::Composite()
{
if (!IsRootVM()) {
return RootViewManager()->Composite();
}
if (UpdateCount() > 0)
{
ForceUpdate();
ClearUpdateCount();
}
return NS_OK;
}
NS_IMETHODIMP nsViewManager::UpdateView(nsIView *aView, PRUint32 aUpdateFlags)
{
// Mark the entire view as damaged
nsView* view = static_cast<nsView*>(aView);
nsRect bounds = view->GetBounds();
view->ConvertFromParentCoords(&bounds.x, &bounds.y);
return UpdateView(view, bounds, aUpdateFlags);
}
// This method accumulates the intersectons of all dirty regions attached to
// descendants of aSourceView with the cliprect of aTargetView into the dirty
// region of aTargetView, after offseting said intersections by aOffset.
static void
AccumulateIntersectionsIntoDirtyRegion(nsView* aTargetView,
nsView* aSourceView,
const nsPoint& aOffset)
{
if (aSourceView->HasNonEmptyDirtyRegion()) {
// In most cases, aSourceView is an ancestor of aTargetView, since most
// commonly we have dirty rects on the root view.
nsPoint offset = aTargetView->GetOffsetTo(aSourceView);
nsRegion intersection;
intersection = *aSourceView->GetDirtyRegion();
if (!intersection.IsEmpty()) {
nsRegion* targetRegion = aTargetView->GetDirtyRegion();
if (targetRegion) {
intersection.MoveBy(-offset + aOffset);
targetRegion->Or(*targetRegion, intersection);
// Random simplification number...
targetRegion->SimplifyOutward(20);
}
}
}
if (aSourceView == aTargetView) {
// No need to do this with kids of aTargetView
return;
}
for (nsView* kid = aSourceView->GetFirstChild();
kid;
kid = kid->GetNextSibling()) {
AccumulateIntersectionsIntoDirtyRegion(aTargetView, kid, aOffset);
}
}
nsresult
nsViewManager::WillBitBlit(nsView* aView, nsPoint aScrollAmount)
{
if (!IsRootVM()) {
RootViewManager()->WillBitBlit(aView, aScrollAmount);
return NS_OK;
}
NS_PRECONDITION(aView, "Must have a view");
NS_PRECONDITION(aView->HasWidget(), "View must have a widget");
++mScrollCnt;
// Since the view is actually moving the widget by -aScrollAmount, that's the
// offset we want to use when accumulating dirty rects.
AccumulateIntersectionsIntoDirtyRegion(aView, GetRootView(), -aScrollAmount);
return NS_OK;
}
// Invalidate all widgets which overlap the view, other than the view's own widgets.
void
nsViewManager::UpdateViewAfterScroll(nsView *aView, const nsRegion& aUpdateRegion)
{
NS_ASSERTION(RootViewManager()->mScrollCnt > 0,
"Someone forgot to call WillBitBlit()");
// Look at the view's clipped rect. It may be that part of the view is clipped out
// in which case we don't need to worry about invalidating the clipped-out part.
nsRect damageRect = aView->GetDimensions();
if (damageRect.IsEmpty()) {
return;
}
nsPoint offset = ComputeViewOffset(aView);
damageRect.MoveBy(offset);
// if this is a floating view, it isn't covered by any widgets other than
// its children, which are handled by the widget scroller.
if (aView->GetFloating()) {
return;
}
UpdateWidgetArea(RootViewManager()->GetRootView(), nsRegion(damageRect), aView);
if (!aUpdateRegion.IsEmpty()) {
// XXX We should update the region, not the bounds rect, but that requires
// a little more work. Fix this when we reshuffle this code.
nsRegion update(aUpdateRegion);
update.MoveBy(offset);
UpdateWidgetArea(RootViewManager()->GetRootView(), update, nsnull);
// FlushPendingInvalidates();
}
Composite();
--RootViewManager()->mScrollCnt;
}
/**
* @param aDamagedRegion this region, relative to aWidgetView, is invalidated in
* every widget child of aWidgetView, plus aWidgetView's own widget
* @param aIgnoreWidgetView if non-null, the aIgnoreWidgetView's widget and its
* children are not updated.
*/
void
nsViewManager::UpdateWidgetArea(nsView *aWidgetView, const nsRegion &aDamagedRegion,
nsView* aIgnoreWidgetView)
{
if (!IsRefreshEnabled()) {
// accumulate this rectangle in the view's dirty region, so we can
// process it later.
nsRegion* dirtyRegion = aWidgetView->GetDirtyRegion();
if (!dirtyRegion) return;
dirtyRegion->Or(*dirtyRegion, aDamagedRegion);
// Don't let dirtyRegion grow beyond 8 rects
dirtyRegion->SimplifyOutward(8);
nsViewManager* rootVM = RootViewManager();
rootVM->mHasPendingUpdates = PR_TRUE;
rootVM->IncrementUpdateCount();
return;
// this should only happen at the top level, and this result
// should not be consumed by top-level callers, so it doesn't
// really matter what we return
}
// If the bounds don't overlap at all, there's nothing to do
nsRegion intersection;
intersection.And(aWidgetView->GetDimensions(), aDamagedRegion);
if (intersection.IsEmpty()) {
return;
}
// If the widget is hidden, it don't cover nothing
if (nsViewVisibility_kHide == aWidgetView->GetVisibility()) {
#ifdef DEBUG
// Assert if view is hidden but widget is visible
nsIWidget* widget = aWidgetView->GetNearestWidget(nsnull);
if (widget) {
PRBool visible;
widget->IsVisible(visible);
NS_ASSERTION(!visible, "View is hidden but widget is visible!");
}
#endif
return;
}
if (aWidgetView == aIgnoreWidgetView) {
// the widget for aIgnoreWidgetView (and its children) should be treated as already updated.
return;
}
nsIWidget* widget = aWidgetView->GetNearestWidget(nsnull);
if (!widget) {
// The root view or a scrolling view might not have a widget
// (for example, during printing). We get here when we scroll
// during printing to show selected options in a listbox, for example.
return;
}
// Update all child widgets with the damage. In the process,
// accumulate the union of all the child widget areas, or at least
// some subset of that.
nsRegion children;
for (nsIWidget* childWidget = widget->GetFirstChild();
childWidget;
childWidget = childWidget->GetNextSibling()) {
nsView* view = nsView::GetViewFor(childWidget);
NS_ASSERTION(view != aWidgetView, "will recur infinitely");
if (view && view->GetVisibility() == nsViewVisibility_kShow) {
// Don't mess with views that are in completely different view
// manager trees
if (view->GetViewManager()->RootViewManager() == RootViewManager()) {
// get the damage region into 'view's coordinate system
nsRegion damage = intersection;
nsPoint offset = view->GetOffsetTo(aWidgetView);
damage.MoveBy(-offset);
UpdateWidgetArea(view, damage, aIgnoreWidgetView);
children.Or(children, view->GetDimensions() + offset);
children.SimplifyInward(20);
}
}
}
nsRegion leftOver;
leftOver.Sub(intersection, children);
if (!leftOver.IsEmpty()) {
NS_ASSERTION(IsRefreshEnabled(), "Can only get here with refresh enabled, I hope");
const nsRect* r;
for (nsRegionRectIterator iter(leftOver); (r = iter.Next());) {
nsRect bounds = *r;
ViewToWidget(aWidgetView, aWidgetView, bounds);
widget->Invalidate(bounds, PR_FALSE);
}
}
}
NS_IMETHODIMP nsViewManager::UpdateView(nsIView *aView, const nsRect &aRect, PRUint32 aUpdateFlags)
{
NS_PRECONDITION(nsnull != aView, "null view");
nsView* view = static_cast<nsView*>(aView);
nsRect damagedRect(aRect);
// If the rectangle is not visible then abort
// without invalidating. This is a performance
// enhancement since invalidating a native widget
// can be expensive.
// This also checks for silly request like damagedRect.width = 0 or damagedRect.height = 0
nsRectVisibility rectVisibility;
GetRectVisibility(view, damagedRect, 0, &rectVisibility);
if (rectVisibility != nsRectVisibility_kVisible) {
return NS_OK;
}
// if this is a floating view, it isn't covered by any widgets other than
// its children. In that case we walk up to its parent widget and use
// that as the root to update from. This also means we update areas that
// may be outside the parent view(s), which is necessary for floats.
if (view->GetFloating()) {
nsView* widgetParent = view;
while (!widgetParent->HasWidget()) {
widgetParent->ConvertToParentCoords(&damagedRect.x, &damagedRect.y);
widgetParent = widgetParent->GetParent();
}
UpdateWidgetArea(widgetParent, nsRegion(damagedRect), nsnull);
} else {
// Propagate the update to the root widget of the root view manager, since
// iframes, for example, can overlap each other and be translucent. So we
// have to possibly invalidate our rect in each of the widgets we have
// lying about.
damagedRect.MoveBy(ComputeViewOffset(view));
UpdateWidgetArea(RootViewManager()->GetRootView(), nsRegion(damagedRect), nsnull);
}
RootViewManager()->IncrementUpdateCount();
if (!IsRefreshEnabled()) {
return NS_OK;
}
// See if we should do an immediate refresh or wait
if (aUpdateFlags & NS_VMREFRESH_IMMEDIATE) {
Composite();
}
return NS_OK;
}
NS_IMETHODIMP nsViewManager::UpdateAllViews(PRUint32 aUpdateFlags)
{
if (RootViewManager() != this) {
return RootViewManager()->UpdateAllViews(aUpdateFlags);
}
UpdateViews(mRootView, aUpdateFlags);
return NS_OK;
}
void nsViewManager::UpdateViews(nsView *aView, PRUint32 aUpdateFlags)
{
// update this view.
UpdateView(aView, aUpdateFlags);
// update all children as well.
nsView* childView = aView->GetFirstChild();
while (nsnull != childView) {
UpdateViews(childView, aUpdateFlags);
childView = childView->GetNextSibling();
}
}
NS_IMETHODIMP nsViewManager::DispatchEvent(nsGUIEvent *aEvent, nsEventStatus *aStatus)
{
*aStatus = nsEventStatus_eIgnore;
switch(aEvent->message)
{
case NS_SIZE:
{
nsView* view = nsView::GetViewFor(aEvent->widget);
if (nsnull != view)
{
nscoord width = ((nsSizeEvent*)aEvent)->windowSize->width;
nscoord height = ((nsSizeEvent*)aEvent)->windowSize->height;
width = ((nsSizeEvent*)aEvent)->mWinWidth;
height = ((nsSizeEvent*)aEvent)->mWinHeight;
// The root view may not be set if this is the resize associated with
// window creation
if (view == mRootView)
{
PRInt32 p2a = mContext->AppUnitsPerDevPixel();
SetWindowDimensions(NSIntPixelsToAppUnits(width, p2a),
NSIntPixelsToAppUnits(height, p2a));
*aStatus = nsEventStatus_eConsumeNoDefault;
}
}
break;
}
case NS_PAINT:
{
nsPaintEvent *event = static_cast<nsPaintEvent*>(aEvent);
nsView *view = nsView::GetViewFor(aEvent->widget);
if (!view || !mContext)
break;
*aStatus = nsEventStatus_eConsumeNoDefault;
// The rect is in device units, and it's in the coordinate space of its
// associated window.
nsCOMPtr<nsIRegion> region = event->region;
if (!region) {
if (NS_FAILED(CreateRegion(getter_AddRefs(region))))
break;
const nsRect& damrect = *event->rect;
region->SetTo(damrect.x, damrect.y, damrect.width, damrect.height);
}
if (region->IsEmpty())
break;
// Refresh the view
if (IsRefreshEnabled()) {
// If an ancestor widget was hidden and then shown, we could
// have a delayed resize to handle.
PRBool didResize = PR_FALSE;
for (nsViewManager *vm = this; vm;
vm = vm->mRootView->GetParent()
? vm->mRootView->GetParent()->GetViewManager()
: nsnull) {
if (vm->mDelayedResize != nsSize(NSCOORD_NONE, NSCOORD_NONE) &&
IsViewVisible(vm->mRootView)) {
vm->DoSetWindowDimensions(vm->mDelayedResize.width,
vm->mDelayedResize.height);
vm->mDelayedResize.SizeTo(NSCOORD_NONE, NSCOORD_NONE);
// Paint later.
vm->UpdateView(vm->mRootView, NS_VMREFRESH_NO_SYNC);
didResize = PR_TRUE;
// not sure if it's valid for us to claim that we
// ignored this, but we're going to do so anyway, since
// we didn't actually paint anything
*aStatus = nsEventStatus_eIgnore;
}
}
if (!didResize) {
//NS_ASSERTION(IsViewVisible(view), "painting an invisible view");
// Just notify our own view observer that we're about to paint
// XXXbz do we need to notify other view observers for viewmanagers
// in our tree?
// Make sure to not send WillPaint notifications while scrolling
nsViewManager* rootVM = RootViewManager();
nsIWidget *widget = mRootView->GetWidget();
PRBool translucentWindow = PR_FALSE;
if (widget)
widget->GetWindowTranslucency(translucentWindow);
if (rootVM->mScrollCnt == 0 && !translucentWindow) {
nsIViewObserver* observer = GetViewObserver();
if (observer) {
// Do an update view batch. Make sure not to do it DEFERRED,
// since that would effectively delay any invalidates that are
// triggered by the WillPaint notification (they'd happen when
// the invalid event fires, which is later than the reflow
// event would fire and could end up being after some timer
// events, leading to frame dropping in DHTML). Note that the
// observer may try to reenter this code from inside
// WillPaint() by trying to do a synchronous paint, but since
// refresh will be disabled it won't be able to do the paint.
// We should really sort out the rules on our synch painting
// api....
BeginUpdateViewBatch();
observer->WillPaint();
EndUpdateViewBatch(NS_VMREFRESH_NO_SYNC);
// Get the view pointer again since the code above might have
// destroyed it (bug 378273).
view = nsView::GetViewFor(aEvent->widget);
}
}
// Make sure to sync up any widget geometry changes we
// have pending before we paint.
if (rootVM->mHasPendingUpdates) {
rootVM->ProcessPendingUpdates(mRootView, PR_FALSE);
}
if (view) {
Refresh(view, event->renderingContext, region,
NS_VMREFRESH_DOUBLE_BUFFER);
}
}
} else {
// since we got an NS_PAINT event, we need to
// draw something so we don't get blank areas.
nsRect damRect;
region->GetBoundingBox(&damRect.x, &damRect.y, &damRect.width, &damRect.height);
PRInt32 p2a = mContext->AppUnitsPerDevPixel();
damRect.ScaleRoundOut(float(p2a));
DefaultRefresh(view, event->renderingContext, &damRect);
// Clients like the editor can trigger multiple
// reflows during what the user perceives as a single
// edit operation, so it disables view manager
// refreshing until the edit operation is complete
// so that users don't see the intermediate steps.
//
// Unfortunately some of these reflows can trigger
// nsScrollPortView and nsScrollingView Scroll() calls
// which in most cases force an immediate BitBlt and
// synchronous paint to happen even if the view manager's
// refresh is disabled. (Bug 97674)
//
// Calling UpdateView() here, is necessary to add
// the exposed region specified in the synchronous paint
// event to the view's damaged region so that it gets
// painted properly when refresh is enabled.
//
// Note that calling UpdateView() here was deemed
// to have the least impact on performance, since the
// other alternative was to make Scroll() post an
// async paint event for the *entire* ScrollPort or
// ScrollingView's viewable area. (See bug 97674 for this
// alternate patch.)
UpdateView(view, damRect, NS_VMREFRESH_NO_SYNC);
}
break;
}
case NS_CREATE:
case NS_DESTROY:
case NS_SETZLEVEL:
case NS_MOVE:
/* Don't pass these events through. Passing them through
causes performance problems on pages with lots of views/frames
@see bug 112861 */
*aStatus = nsEventStatus_eConsumeNoDefault;
break;
case NS_DISPLAYCHANGED:
//Destroy the cached backbuffer to force a new backbuffer
//be constructed with the appropriate display depth.
//@see bugzilla bug 6061
*aStatus = nsEventStatus_eConsumeDoDefault;
break;
case NS_SYSCOLORCHANGED:
{
// Hold a refcount to the observer. The continued existence of the observer will
// delay deletion of this view hierarchy should the event want to cause its
// destruction in, say, some JavaScript event handler.
nsView *view = nsView::GetViewFor(aEvent->widget);
nsCOMPtr<nsIViewObserver> obs = GetViewObserver();
if (obs) {
obs->HandleEvent(view, aEvent, aStatus);
}
}
break;
default:
{
if ((NS_IS_MOUSE_EVENT(aEvent) &&
// Ignore moves that we synthesize.
static_cast<nsMouseEvent*>(aEvent)->reason ==
nsMouseEvent::eReal &&
// Ignore mouse exit and enter (we'll get moves if the user
// is really moving the mouse) since we get them when we
// create and destroy widgets.
aEvent->message != NS_MOUSE_EXIT &&
aEvent->message != NS_MOUSE_ENTER) ||
NS_IS_KEY_EVENT(aEvent) ||
NS_IS_IME_EVENT(aEvent)) {
gLastUserEventTime = PR_IntervalToMicroseconds(PR_IntervalNow());
}
if (aEvent->message == NS_DEACTIVATE) {
PRBool result;
GrabMouseEvents(nsnull, result);
}
//Find the view whose coordinates system we're in.
nsView* baseView = nsView::GetViewFor(aEvent->widget);
nsView* view = baseView;
PRBool capturedEvent = PR_FALSE;
if (!NS_IS_KEY_EVENT(aEvent) && !NS_IS_IME_EVENT(aEvent) &&
!NS_IS_CONTEXT_MENU_KEY(aEvent) && !NS_IS_FOCUS_EVENT(aEvent) &&
aEvent->eventStructType != NS_ACCESSIBLE_EVENT) {
// will dispatch using coordinates. Pretty bogus but it's consistent
// with what presshell does.
view = GetDisplayRootFor(baseView);
}
//Find the view to which we're initially going to send the event
//for hittesting.
if (NS_IS_MOUSE_EVENT(aEvent) || NS_IS_DRAG_EVENT(aEvent)) {
nsView* mouseGrabber = GetMouseEventGrabber();
if (mouseGrabber) {
view = mouseGrabber;
capturedEvent = PR_TRUE;
}
}
if (nsnull != view) {
PRInt32 p2a = mContext->AppUnitsPerDevPixel();
if ((aEvent->message == NS_MOUSE_MOVE &&
static_cast<nsMouseEvent*>(aEvent)->reason ==
nsMouseEvent::eReal) ||
aEvent->message == NS_MOUSE_ENTER) {
// aEvent->point is relative to the widget, i.e. the view top-left,
// so we need to add the offset to the view origin
nsPoint rootOffset = baseView->GetDimensions().TopLeft();
rootOffset += baseView->GetOffsetTo(RootViewManager()->mRootView);
RootViewManager()->mMouseLocation = aEvent->refPoint +
nsPoint(NSAppUnitsToIntPixels(rootOffset.x, p2a),
NSAppUnitsToIntPixels(rootOffset.y, p2a));
#ifdef DEBUG_MOUSE_LOCATION
if (aEvent->message == NS_MOUSE_ENTER)
printf("[vm=%p]got mouse enter for %p\n",
this, aEvent->widget);
printf("[vm=%p]setting mouse location to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
if (aEvent->message == NS_MOUSE_ENTER)
SynthesizeMouseMove(PR_FALSE);
} else if (aEvent->message == NS_MOUSE_EXIT) {
// Although we only care about the mouse moving into an area
// for which this view manager doesn't receive mouse move
// events, we don't check which view the mouse exit was for
// since this seems to vary by platform. Hopefully this
// won't matter at all since we'll get the mouse move or
// enter after the mouse exit when the mouse moves from one
// of our widgets into another.
RootViewManager()->mMouseLocation = nsPoint(NSCOORD_NONE, NSCOORD_NONE);
#ifdef DEBUG_MOUSE_LOCATION
printf("[vm=%p]got mouse exit for %p\n",
this, aEvent->widget);
printf("[vm=%p]clearing mouse location\n",
this);
#endif
}
//Calculate the proper offset for the view we're going to
nsPoint offset(0, 0);
if (view != baseView) {
//Get offset from root of baseView
nsView *parent;
for (parent = baseView; parent; parent = parent->GetParent())
parent->ConvertToParentCoords(&offset.x, &offset.y);
//Subtract back offset from root of view
for (parent = view; parent; parent = parent->GetParent())
parent->ConvertFromParentCoords(&offset.x, &offset.y);
}
// Dispatch the event
nsRect baseViewDimensions;
if (baseView != nsnull) {
baseView->GetDimensions(baseViewDimensions);
}
nsPoint pt;
pt.x = baseViewDimensions.x +
NSFloatPixelsToAppUnits(float(aEvent->refPoint.x) + 0.5f, p2a);
pt.y = baseViewDimensions.y +
NSFloatPixelsToAppUnits(float(aEvent->refPoint.y) + 0.5f, p2a);
pt += offset;
*aStatus = HandleEvent(view, pt, aEvent, capturedEvent);
//
// if the event is an nsTextEvent, we need to map the reply back into platform coordinates
//
if (aEvent->message==NS_TEXT_TEXT) {
((nsTextEvent*)aEvent)->theReply.mCursorPosition.x=NSAppUnitsToIntPixels(((nsTextEvent*)aEvent)->theReply.mCursorPosition.x, p2a);
((nsTextEvent*)aEvent)->theReply.mCursorPosition.y=NSAppUnitsToIntPixels(((nsTextEvent*)aEvent)->theReply.mCursorPosition.y, p2a);
((nsTextEvent*)aEvent)->theReply.mCursorPosition.width=NSAppUnitsToIntPixels(((nsTextEvent*)aEvent)->theReply.mCursorPosition.width, p2a);
((nsTextEvent*)aEvent)->theReply.mCursorPosition.height=NSAppUnitsToIntPixels(((nsTextEvent*)aEvent)->theReply.mCursorPosition.height, p2a);
}
if((aEvent->message==NS_COMPOSITION_START) ||
(aEvent->message==NS_COMPOSITION_QUERY)) {
((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.x=NSAppUnitsToIntPixels(((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.x, p2a);
((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.y=NSAppUnitsToIntPixels(((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.y, p2a);
((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.width=NSAppUnitsToIntPixels(((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.width, p2a);
((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.height=NSAppUnitsToIntPixels(((nsCompositionEvent*)aEvent)->theReply.mCursorPosition.height, p2a);
}
if(aEvent->message==NS_QUERYCARETRECT) {
((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.x=NSAppUnitsToIntPixels(((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.x, p2a);
((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.y=NSAppUnitsToIntPixels(((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.y, p2a);
((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.width=NSAppUnitsToIntPixels(((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.width, p2a);
((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.height=NSAppUnitsToIntPixels(((nsQueryCaretRectEvent*)aEvent)->theReply.mCaretRect.height, p2a);
}
}
break;
}
}
return NS_OK;
}
nsEventStatus nsViewManager::HandleEvent(nsView* aView, nsPoint aPoint,
nsGUIEvent* aEvent, PRBool aCaptured) {
//printf(" %d %d %d %d (%d,%d) \n", this, event->widget, event->widgetSupports,
// event->message, event->point.x, event->point.y);
// Hold a refcount to the observer. The continued existence of the observer will
// delay deletion of this view hierarchy should the event want to cause its
// destruction in, say, some JavaScript event handler.
nsCOMPtr<nsIViewObserver> obs = aView->GetViewManager()->GetViewObserver();
nsEventStatus status = nsEventStatus_eIgnore;
if (obs) {
obs->HandleEvent(aView, aEvent, &status);
}
return status;
}
NS_IMETHODIMP nsViewManager::GrabMouseEvents(nsIView *aView, PRBool &aResult)
{
if (!IsRootVM()) {
return RootViewManager()->GrabMouseEvents(aView, aResult);
}
// Along with nsView::SetVisibility, we enforce that the mouse grabber
// can never be a hidden view.
if (aView && static_cast<nsView*>(aView)->GetVisibility()
== nsViewVisibility_kHide) {
aView = nsnull;
}
#ifdef DEBUG_mjudge
if (aView)
{
printf("capturing mouse events for view %x\n",aView);
}
printf("removing mouse capture from view %x\n",mMouseGrabber);
#endif
mMouseGrabber = static_cast<nsView*>(aView);
aResult = PR_TRUE;
return NS_OK;
}
NS_IMETHODIMP nsViewManager::GetMouseEventGrabber(nsIView *&aView)
{
aView = GetMouseEventGrabber();
return NS_OK;
}
// Recursively reparent widgets if necessary
void nsViewManager::ReparentChildWidgets(nsIView* aView, nsIWidget *aNewWidget)
{
if (aView->HasWidget()) {
// Check to see if the parent widget is the
// same as the new parent. If not then reparent
// the widget, otherwise there is nothing more
// to do for the view and its descendants
nsIWidget* widget = aView->GetWidget();
nsIWidget* parentWidget = widget->GetParent();
if (parentWidget != aNewWidget) {
#ifdef DEBUG
nsresult rv =
#endif
widget->SetParent(aNewWidget);
NS_ASSERTION(NS_SUCCEEDED(rv), "SetParent failed!");
}
return;
}
// Need to check each of the views children to see
// if they have a widget and reparent it.
nsView* view = static_cast<nsView*>(aView);
for (nsView *kid = view->GetFirstChild(); kid; kid = kid->GetNextSibling()) {
ReparentChildWidgets(kid, aNewWidget);
}
}
// Reparent a view and its descendant views widgets if necessary
void nsViewManager::ReparentWidgets(nsIView* aView, nsIView *aParent)
{
NS_PRECONDITION(aParent, "Must have a parent");
NS_PRECONDITION(aView, "Must have a view");
// Quickly determine whether the view has pre-existing children or a
// widget. In most cases the view will not have any pre-existing
// children when this is called. Only in the case
// where a view has been reparented by removing it from
// a reinserting it into a new location in the view hierarchy do we
// have to consider reparenting the existing widgets for the view and
// it's descendants.
nsView* view = static_cast<nsView*>(aView);
if (view->HasWidget() || view->GetFirstChild()) {
nsIWidget* parentWidget = aParent->GetNearestWidget(nsnull);
if (parentWidget) {
ReparentChildWidgets(aView, parentWidget);
return;
}
NS_WARNING("Can not find a widget for the parent view");
}
}
NS_IMETHODIMP nsViewManager::InsertChild(nsIView *aParent, nsIView *aChild, nsIView *aSibling,
PRBool aAfter)
{
nsView* parent = static_cast<nsView*>(aParent);
nsView* child = static_cast<nsView*>(aChild);
nsView* sibling = static_cast<nsView*>(aSibling);
NS_PRECONDITION(nsnull != parent, "null ptr");
NS_PRECONDITION(nsnull != child, "null ptr");
NS_ASSERTION(sibling == nsnull || sibling->GetParent() == parent,
"tried to insert view with invalid sibling");
NS_ASSERTION(!IsViewInserted(child), "tried to insert an already-inserted view");
if ((nsnull != parent) && (nsnull != child))
{
// if aAfter is set, we will insert the child after 'prev' (i.e. after 'kid' in document
// order, otherwise after 'kid' (i.e. before 'kid' in document order).
#if 1
if (nsnull == aSibling) {
if (aAfter) {
// insert at end of document order, i.e., before first view
// this is the common case, by far
parent->InsertChild(child, nsnull);
ReparentWidgets(child, parent);
} else {
// insert at beginning of document order, i.e., after last view
nsView *kid = parent->GetFirstChild();
nsView *prev = nsnull;
while (kid) {
prev = kid;
kid = kid->GetNextSibling();
}
// prev is last view or null if there are no children
parent->InsertChild(child, prev);
ReparentWidgets(child, parent);
}
} else {
nsView *kid = parent->GetFirstChild();
nsView *prev = nsnull;
while (kid && sibling != kid) {
//get the next sibling view
prev = kid;
kid = kid->GetNextSibling();
}
NS_ASSERTION(kid != nsnull,
"couldn't find sibling in child list");
if (aAfter) {
// insert after 'kid' in document order, i.e. before in view order
parent->InsertChild(child, prev);
ReparentWidgets(child, parent);
} else {
// insert before 'kid' in document order, i.e. after in view order
parent->InsertChild(child, kid);
ReparentWidgets(child, parent);
}
}
#else // don't keep consistent document order, but order things by z-index instead
// essentially we're emulating the old InsertChild(parent, child, zindex)
PRInt32 zIndex = child->GetZIndex();
while (nsnull != kid)
{
PRInt32 idx = kid->GetZIndex();
if (CompareZIndex(zIndex, child->IsTopMost(), child->GetZIndexIsAuto(),
idx, kid->IsTopMost(), kid->GetZIndexIsAuto()) >= 0)
break;
prev = kid;
kid = kid->GetNextSibling();
}
parent->InsertChild(child, prev);
ReparentWidgets(child, parent);
#endif
// if the parent view is marked as "floating", make the newly added view float as well.
if (parent->GetFloating())
child->SetFloating(PR_TRUE);
//and mark this area as dirty if the view is visible...
if (nsViewVisibility_kHide != child->GetVisibility())
UpdateView(child, NS_VMREFRESH_NO_SYNC);
}
return NS_OK;
}
NS_IMETHODIMP nsViewManager::InsertChild(nsIView *aParent, nsIView *aChild, PRInt32 aZIndex)
{
// no-one really calls this with anything other than aZIndex == 0 on a fresh view
// XXX this method should simply be eliminated and its callers redirected to the real method
SetViewZIndex(aChild, PR_FALSE, aZIndex, PR_FALSE);
return InsertChild(aParent, aChild, nsnull, PR_TRUE);
}
NS_IMETHODIMP nsViewManager::RemoveChild(nsIView *aChild)
{
nsView* child = static_cast<nsView*>(aChild);
NS_ENSURE_ARG_POINTER(child);
nsView* parent = child->GetParent();
if (nsnull != parent)
{
UpdateView(child, NS_VMREFRESH_NO_SYNC);
parent->RemoveChild(child);
}
return NS_OK;
}
NS_IMETHODIMP nsViewManager::MoveViewBy(nsIView *aView, nscoord aX, nscoord aY)
{
nsView* view = static_cast<nsView*>(aView);
nsPoint pt = view->GetPosition();
MoveViewTo(view, aX + pt.x, aY + pt.y);
return NS_OK;
}
NS_IMETHODIMP nsViewManager::MoveViewTo(nsIView *aView, nscoord aX, nscoord aY)
{
nsView* view = static_cast<nsView*>(aView);
nsPoint oldPt = view->GetPosition();
nsRect oldArea = view->GetBounds();
view->SetPosition(aX, aY);
// only do damage control if the view is visible
if ((aX != oldPt.x) || (aY != oldPt.y)) {
if (view->GetVisibility() != nsViewVisibility_kHide) {
nsView* parentView = view->GetParent();
UpdateView(parentView, oldArea, NS_VMREFRESH_NO_SYNC);
UpdateView(parentView, view->GetBounds(), NS_VMREFRESH_NO_SYNC);
}
}
return NS_OK;
}
void nsViewManager::InvalidateHorizontalBandDifference(nsView *aView, const nsRect& aRect, const nsRect& aCutOut,
PRUint32 aUpdateFlags, nscoord aY1, nscoord aY2, PRBool aInCutOut) {
nscoord height = aY2 - aY1;
if (aRect.x < aCutOut.x) {
nsRect r(aRect.x, aY1, aCutOut.x - aRect.x, height);
UpdateView(aView, r, aUpdateFlags);
}
if (!aInCutOut && aCutOut.x < aCutOut.XMost()) {
nsRect r(aCutOut.x, aY1, aCutOut.width, height);
UpdateView(aView, r, aUpdateFlags);
}
if (aCutOut.XMost() < aRect.XMost()) {
nsRect r(aCutOut.XMost(), aY1, aRect.XMost() - aCutOut.XMost(), height);
UpdateView(aView, r, aUpdateFlags);
}
}
void nsViewManager::InvalidateRectDifference(nsView *aView, const nsRect& aRect, const nsRect& aCutOut,
PRUint32 aUpdateFlags) {
if (aRect.y < aCutOut.y) {
InvalidateHorizontalBandDifference(aView, aRect, aCutOut, aUpdateFlags, aRect.y, aCutOut.y, PR_FALSE);
}
if (aCutOut.y < aCutOut.YMost()) {
InvalidateHorizontalBandDifference(aView, aRect, aCutOut, aUpdateFlags, aCutOut.y, aCutOut.YMost(), PR_TRUE);
}
if (aCutOut.YMost() < aRect.YMost()) {
InvalidateHorizontalBandDifference(aView, aRect, aCutOut, aUpdateFlags, aCutOut.YMost(), aRect.YMost(), PR_FALSE);
}
}
NS_IMETHODIMP nsViewManager::ResizeView(nsIView *aView, const nsRect &aRect, PRBool aRepaintExposedAreaOnly)
{
nsView* view = static_cast<nsView*>(aView);
nsRect oldDimensions;
view->GetDimensions(oldDimensions);
if (oldDimensions != aRect) {
nsView* parentView = view->GetParent();
if (parentView == nsnull)
parentView = view;
// resize the view.
// Prevent Invalidation of hidden views
if (view->GetVisibility() == nsViewVisibility_kHide) {
view->SetDimensions(aRect, PR_FALSE);
} else {
if (!aRepaintExposedAreaOnly) {
//Invalidate the union of the old and new size
view->SetDimensions(aRect, PR_TRUE);
UpdateView(view, aRect, NS_VMREFRESH_NO_SYNC);
view->ConvertToParentCoords(&oldDimensions.x, &oldDimensions.y);
UpdateView(parentView, oldDimensions, NS_VMREFRESH_NO_SYNC);
} else {
view->SetDimensions(aRect, PR_TRUE);
InvalidateRectDifference(view, aRect, oldDimensions, NS_VMREFRESH_NO_SYNC);
nsRect r = aRect;
view->ConvertToParentCoords(&r.x, &r.y);
view->ConvertToParentCoords(&oldDimensions.x, &oldDimensions.y);
InvalidateRectDifference(parentView, oldDimensions, r, NS_VMREFRESH_NO_SYNC);
}
}
}
// Note that if layout resizes the view and the view has a custom clip
// region set, then we expect layout to update the clip region too. Thus
// in the case where mClipRect has been optimized away to just be a null
// pointer, and this resize is implicitly changing the clip rect, it's OK
// because layout will change it back again if necessary.
return NS_OK;
}
PRBool nsViewManager::CanScrollWithBitBlt(nsView* aView, nsPoint aDelta,
nsRegion* aUpdateRegion)
{
NS_ASSERTION(!IsPainting(),
"View manager shouldn't be scrolling during a paint");
if (IsPainting() || !mObserver) {
return PR_FALSE; // do the safe thing
}
nsView* displayRoot = GetDisplayRootFor(aView);
nsPoint displayOffset = aView->GetParent()->GetOffsetTo(displayRoot);
nsRect parentBounds = aView->GetParent()->GetDimensions() + displayOffset;
// The rect we're going to scroll is intersection of the parent bounds with its
// preimage
nsRect toScroll;
toScroll.IntersectRect(parentBounds + aDelta, parentBounds);
nsresult rv =
mObserver->ComputeRepaintRegionForCopy(displayRoot, aView, -aDelta, toScroll,
aUpdateRegion);
NS_ENSURE_SUCCESS(rv, PR_FALSE);
aUpdateRegion->MoveBy(-displayOffset);
#ifdef MOZ_WIDGET_GTK2
return aUpdateRegion->IsEmpty();
#else
return PR_TRUE;
#endif
}
NS_IMETHODIMP nsViewManager::SetViewFloating(nsIView *aView, PRBool aFloating)
{
nsView* view = static_cast<nsView*>(aView);
NS_ASSERTION(!(nsnull == view), "no view");
view->SetFloating(aFloating);
return NS_OK;
}
NS_IMETHODIMP nsViewManager::SetViewVisibility(nsIView *aView, nsViewVisibility aVisible)
{
nsView* view = static_cast<nsView*>(aView);
if (aVisible != view->GetVisibility()) {
view->SetVisibility(aVisible);
if (IsViewInserted(view)) {
if (!view->HasWidget()) {
if (nsViewVisibility_kHide == aVisible) {
nsView* parentView = view->GetParent();
if (parentView) {
UpdateView(parentView, view->GetBounds(), NS_VMREFRESH_NO_SYNC);
}
}
else {
UpdateView(view, NS_VMREFRESH_NO_SYNC);
}
}
}
// Any child views not associated with frames might not get their visibility
// updated, so propagate our visibility to them. This is important because
// hidden views should have all hidden children.
for (nsView* childView = view->GetFirstChild(); childView;
childView = childView->GetNextSibling()) {
if (!childView->GetClientData()) {
childView->SetVisibility(aVisible);
}
}
}
return NS_OK;
}
void nsViewManager::UpdateWidgetsForView(nsView* aView)
{
NS_PRECONDITION(aView, "Must have view!");
if (aView->HasWidget()) {
aView->GetWidget()->Update();
}
for (nsView* childView = aView->GetFirstChild();
childView;
childView = childView->GetNextSibling()) {
UpdateWidgetsForView(childView);
}
}
PRBool nsViewManager::IsViewInserted(nsView *aView)
{
if (mRootView == aView) {
return PR_TRUE;
} else if (aView->GetParent() == nsnull) {
return PR_FALSE;
} else {
nsView* view = aView->GetParent()->GetFirstChild();
while (view != nsnull) {
if (view == aView) {
return PR_TRUE;
}
view = view->GetNextSibling();
}
return PR_FALSE;
}
}
NS_IMETHODIMP nsViewManager::SetViewZIndex(nsIView *aView, PRBool aAutoZIndex, PRInt32 aZIndex, PRBool aTopMost)
{
nsView* view = static_cast<nsView*>(aView);
nsresult rv = NS_OK;
NS_ASSERTION((view != nsnull), "no view");
// don't allow the root view's z-index to be changed. It should always be zero.
// This could be removed and replaced with a style rule, or just removed altogether, with interesting consequences
if (aView == mRootView) {
return rv;
}
PRBool oldTopMost = view->IsTopMost();
PRBool oldIsAuto = view->GetZIndexIsAuto();
if (aAutoZIndex) {
aZIndex = 0;
}
PRInt32 oldidx = view->GetZIndex();
view->SetZIndex(aAutoZIndex, aZIndex, aTopMost);
if (oldidx != aZIndex || oldTopMost != aTopMost ||
oldIsAuto != aAutoZIndex) {
UpdateView(view, NS_VMREFRESH_NO_SYNC);
}
return rv;
}
NS_IMETHODIMP nsViewManager::SetViewObserver(nsIViewObserver *aObserver)
{
mObserver = aObserver;
return NS_OK;
}
NS_IMETHODIMP nsViewManager::GetViewObserver(nsIViewObserver *&aObserver)
{
if (nsnull != mObserver) {
aObserver = mObserver;
NS_ADDREF(mObserver);
return NS_OK;
} else
return NS_ERROR_NO_INTERFACE;
}
NS_IMETHODIMP nsViewManager::GetDeviceContext(nsIDeviceContext *&aContext)
{
NS_IF_ADDREF(mContext);
aContext = mContext;
return NS_OK;
}
already_AddRefed<nsIRenderingContext>
nsViewManager::CreateRenderingContext(nsView &aView)
{
nsView *par = &aView;
nsIWidget* win;
nsIRenderingContext *cx = nsnull;
nscoord ax = 0, ay = 0;
do
{
win = par->GetWidget();
if (win)
break;
//get absolute coordinates of view, but don't
//add in view pos since the first thing you ever
//need to do when painting a view is to translate
//the rendering context by the views pos and other parts
//of the code do this for us...
if (par != &aView)
{
par->ConvertToParentCoords(&ax, &ay);
}
par = par->GetParent();
}
while (nsnull != par);
if (nsnull != win)
{
mContext->CreateRenderingContext(par, cx);
if (nsnull != cx)
cx->Translate(ax, ay);
}
return cx;
}
NS_IMETHODIMP nsViewManager::DisableRefresh(void)
{
if (!IsRootVM()) {
return RootViewManager()->DisableRefresh();
}
if (mUpdateBatchCnt > 0)
return NS_OK;
mRefreshEnabled = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP nsViewManager::EnableRefresh(PRUint32 aUpdateFlags)
{
if (!IsRootVM()) {
return RootViewManager()->EnableRefresh(aUpdateFlags);
}
if (mUpdateBatchCnt > 0)
return NS_OK;
mRefreshEnabled = PR_TRUE;
if (!mHasPendingUpdates) {
// Nothing to do
return NS_OK;
}
// nested batching can combine IMMEDIATE with DEFERRED. Favour
// IMMEDIATE over DEFERRED and DEFERRED over NO_SYNC.
if (aUpdateFlags & NS_VMREFRESH_IMMEDIATE) {
FlushPendingInvalidates();
Composite();
} else if (aUpdateFlags & NS_VMREFRESH_DEFERRED) {
PostInvalidateEvent();
} else { // NO_SYNC
FlushPendingInvalidates();
}
return NS_OK;
}
NS_IMETHODIMP nsViewManager::BeginUpdateViewBatch(void)
{
if (!IsRootVM()) {
return RootViewManager()->BeginUpdateViewBatch();
}
nsresult result = NS_OK;
if (mUpdateBatchCnt == 0) {
mUpdateBatchFlags = 0;
result = DisableRefresh();
}
if (NS_SUCCEEDED(result))
++mUpdateBatchCnt;
return result;
}
NS_IMETHODIMP nsViewManager::EndUpdateViewBatch(PRUint32 aUpdateFlags)
{
if (!IsRootVM()) {
return RootViewManager()->EndUpdateViewBatch(aUpdateFlags);
}
nsresult result = NS_OK;
--mUpdateBatchCnt;
NS_ASSERTION(mUpdateBatchCnt >= 0, "Invalid batch count!");
if (mUpdateBatchCnt < 0)
{
mUpdateBatchCnt = 0;
return NS_ERROR_FAILURE;
}
mUpdateBatchFlags |= aUpdateFlags;
if (mUpdateBatchCnt == 0) {
result = EnableRefresh(mUpdateBatchFlags);
}
return result;
}
NS_IMETHODIMP nsViewManager::SetRootScrollableView(nsIScrollableView *aScrollable)
{
mRootScrollable = aScrollable;
return NS_OK;
}
NS_IMETHODIMP nsViewManager::GetRootScrollableView(nsIScrollableView **aScrollable)
{
*aScrollable = mRootScrollable;
return NS_OK;
}
NS_IMETHODIMP nsViewManager::GetWidget(nsIWidget **aWidget)
{
*aWidget = GetWidget();
NS_IF_ADDREF(*aWidget);
return NS_OK;
}
NS_IMETHODIMP nsViewManager::ForceUpdate()
{
if (!IsRootVM()) {
return RootViewManager()->ForceUpdate();
}
// Walk the view tree looking for widgets, and call Update() on each one
UpdateWidgetsForView(mRootView);
return NS_OK;
}
nsPoint nsViewManager::ComputeViewOffset(const nsView *aView)
{
NS_PRECONDITION(aView, "Null view in ComputeViewOffset?");
nsPoint origin(0, 0);
#ifdef DEBUG
const nsView* rootView;
const nsView* origView = aView;
#endif
while (aView) {
#ifdef DEBUG
rootView = aView;
#endif
origin += aView->GetPosition();
aView = aView->GetParent();
}
NS_ASSERTION(rootView ==
origView->GetViewManager()->RootViewManager()->GetRootView(),
"Unexpected root view");
return origin;
}
void nsViewManager::ViewToWidget(nsView *aView, nsView* aWidgetView, nsRect &aRect) const
{
while (aView != aWidgetView) {
aView->ConvertToParentCoords(&aRect.x, &aRect.y);
aView = aView->GetParent();
}
// intersect aRect with bounds of aWidgetView, to prevent generating any illegal rectangles.
nsRect bounds;
aWidgetView->GetDimensions(bounds);
aRect.IntersectRect(aRect, bounds);
// account for the view's origin not lining up with the widget's
aRect.x -= bounds.x;
aRect.y -= bounds.y;
aRect += aView->ViewToWidgetOffset();
// finally, convert to device coordinates.
aRect.ScaleRoundOut(1.0f / mContext->AppUnitsPerDevPixel());
}
nsresult nsViewManager::GetVisibleRect(nsRect& aVisibleRect)
{
nsresult rv = NS_OK;
// Get the viewport scroller
nsIScrollableView* scrollingView;
GetRootScrollableView(&scrollingView);
if (scrollingView) {
// Determine the visible rect in the scrolled view's coordinate space.
// The size of the visible area is the clip view size
nsScrollPortView* clipView = static_cast<nsScrollPortView*>(scrollingView);
clipView->GetDimensions(aVisibleRect);
scrollingView->GetScrollPosition(aVisibleRect.x, aVisibleRect.y);
} else {
rv = NS_ERROR_FAILURE;
}
return rv;
}
nsresult nsViewManager::GetAbsoluteRect(nsView *aView, const nsRect &aRect,
nsRect& aAbsRect)
{
nsIScrollableView* scrollingView = nsnull;
GetRootScrollableView(&scrollingView);
if (nsnull == scrollingView) {
return NS_ERROR_FAILURE;
}
nsIView* scrolledIView = nsnull;
scrollingView->GetScrolledView(scrolledIView);
nsView* scrolledView = static_cast<nsView*>(scrolledIView);
// Calculate the absolute coordinates of the aRect passed in.
// aRects values are relative to aView
aAbsRect = aRect;
nsView *parentView = aView;
while ((parentView != nsnull) && (parentView != scrolledView)) {
parentView->ConvertToParentCoords(&aAbsRect.x, &aAbsRect.y);
parentView = parentView->GetParent();
}
if (parentView != scrolledView) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP nsViewManager::GetRectVisibility(nsIView *aView,
const nsRect &aRect,
PRUint16 aMinTwips,
nsRectVisibility *aRectVisibility)
{
nsView* view = static_cast<nsView*>(aView);
// The parameter aMinTwips determines how many rows/cols of pixels must be visible on each side of the element,
// in order to be counted as visible
*aRectVisibility = nsRectVisibility_kZeroAreaRect;
if (aRect.width == 0 || aRect.height == 0) {
return NS_OK;
}
// is this view even visible?
if (view->GetVisibility() == nsViewVisibility_kHide) {
return NS_OK;
}
// nsViewManager::InsertChild ensures that descendants of floating views
// are also marked floating.
if (view->GetFloating()) {
*aRectVisibility = nsRectVisibility_kVisible;
return NS_OK;
}
// Calculate the absolute coordinates for the visible rectangle
nsRect visibleRect;
if (GetVisibleRect(visibleRect) == NS_ERROR_FAILURE) {
*aRectVisibility = nsRectVisibility_kVisible;
return NS_OK;
}
// Calculate the absolute coordinates of the aRect passed in.
// aRects values are relative to aView
nsRect absRect;
if ((GetAbsoluteRect(view, aRect, absRect)) == NS_ERROR_FAILURE) {
*aRectVisibility = nsRectVisibility_kVisible;
return NS_OK;
}
/*
* If aMinTwips > 0, ensure at least aMinTwips of space around object is visible
* The object is not visible if:
* ((objectTop < windowTop && objectBottom < windowTop) ||
* (objectBottom > windowBottom && objectTop > windowBottom) ||
* (objectLeft < windowLeft && objectRight < windowLeft) ||
* (objectRight > windowRight && objectLeft > windowRight))
*/
if (absRect.y < visibleRect.y &&
absRect.y + absRect.height < visibleRect.y + aMinTwips)
*aRectVisibility = nsRectVisibility_kAboveViewport;
else if (absRect.y + absRect.height > visibleRect.y + visibleRect.height &&
absRect.y > visibleRect.y + visibleRect.height - aMinTwips)
*aRectVisibility = nsRectVisibility_kBelowViewport;
else if (absRect.x < visibleRect.x &&
absRect.x + absRect.width < visibleRect.x + aMinTwips)
*aRectVisibility = nsRectVisibility_kLeftOfViewport;
else if (absRect.x + absRect.width > visibleRect.x + visibleRect.width &&
absRect.x > visibleRect.x + visibleRect.width - aMinTwips)
*aRectVisibility = nsRectVisibility_kRightOfViewport;
else
*aRectVisibility = nsRectVisibility_kVisible;
return NS_OK;
}
NS_IMETHODIMP
nsViewManager::IsPainting(PRBool& aIsPainting)
{
aIsPainting = IsPainting();
return NS_OK;
}
void
nsViewManager::FlushPendingInvalidates()
{
NS_ASSERTION(IsRootVM(), "Must be root VM for this to be called!\n");
NS_ASSERTION(mUpdateBatchCnt == 0, "Must not be in an update batch!");
// XXXbz this is probably not quite OK yet, if callers can explicitly
// DisableRefresh while we have an event posted.
// NS_ASSERTION(mRefreshEnabled, "How did we get here?");
// Let all the view observers of all viewmanagers in this tree know that
// we're about to "paint" (this lets them get in their invalidates now so
// we don't go through two invalidate-processing cycles).
NS_ASSERTION(gViewManagers, "Better have a viewmanagers array!");
// Make sure to not send WillPaint notifications while scrolling
if (mScrollCnt == 0) {
// Disable refresh while we notify our view observers, so that if they do
// view update batches we don't reenter this code and so that we batch
// all of them together. We don't use
// BeginUpdateViewBatch/EndUpdateViewBatch, since that would reenter this
// exact code, but we want the effect of a single big update batch.
PRBool refreshEnabled = mRefreshEnabled;
mRefreshEnabled = PR_FALSE;
++mUpdateBatchCnt;
PRInt32 index;
for (index = 0; index < mVMCount; index++) {
nsViewManager* vm = (nsViewManager*)gViewManagers->ElementAt(index);
if (vm->RootViewManager() == this) {
// One of our kids
nsIViewObserver* observer = vm->GetViewObserver();
if (observer) {
observer->WillPaint();
NS_ASSERTION(mUpdateBatchCnt == 1,
"Observer did not end view batch?");
}
}
}
--mUpdateBatchCnt;
// Someone could have called EnableRefresh on us from inside WillPaint().
// Only reset the old mRefreshEnabled value if the current value is false.
if (!mRefreshEnabled) {
mRefreshEnabled = refreshEnabled;
}
}
if (mHasPendingUpdates) {
ProcessPendingUpdates(mRootView, PR_TRUE);
mHasPendingUpdates = PR_FALSE;
}
}
void
nsViewManager::ProcessInvalidateEvent()
{
NS_ASSERTION(IsRootVM(),
"Incorrectly targeted invalidate event");
// If we're in the middle of an update batch, just repost the event,
// to be processed when the batch ends.
PRBool processEvent = (mUpdateBatchCnt == 0);
if (processEvent) {
FlushPendingInvalidates();
}
mInvalidateEvent.Forget();
if (!processEvent) {
// We didn't actually process this event... post a new one
PostInvalidateEvent();
}
}
NS_IMETHODIMP
nsViewManager::SetDefaultBackgroundColor(nscolor aColor)
{
mDefaultBackgroundColor = aColor;
return NS_OK;
}
NS_IMETHODIMP
nsViewManager::GetDefaultBackgroundColor(nscolor* aColor)
{
*aColor = mDefaultBackgroundColor;
return NS_OK;
}
NS_IMETHODIMP
nsViewManager::GetLastUserEventTime(PRUint32& aTime)
{
aTime = gLastUserEventTime;
return NS_OK;
}
class nsSynthMouseMoveEvent : public nsViewManagerEvent {
public:
nsSynthMouseMoveEvent(nsViewManager *aViewManager,
PRBool aFromScroll)
: nsViewManagerEvent(aViewManager),
mFromScroll(aFromScroll) {
}
NS_IMETHOD Run() {
if (mViewManager)
mViewManager->ProcessSynthMouseMoveEvent(mFromScroll);
return NS_OK;
}
private:
PRBool mFromScroll;
};
NS_IMETHODIMP
nsViewManager::SynthesizeMouseMove(PRBool aFromScroll)
{
if (!IsRootVM())
return RootViewManager()->SynthesizeMouseMove(aFromScroll);
if (mMouseLocation == nsPoint(NSCOORD_NONE, NSCOORD_NONE))
return NS_OK;
if (!mSynthMouseMoveEvent.IsPending()) {
nsRefPtr<nsViewManagerEvent> ev =
new nsSynthMouseMoveEvent(this, aFromScroll);
if (NS_FAILED(NS_DispatchToCurrentThread(ev))) {
NS_WARNING("failed to dispatch nsSynthMouseMoveEvent");
return NS_ERROR_UNEXPECTED;
}
mSynthMouseMoveEvent = ev;
}
return NS_OK;
}
/**
* Find the first floating view with a widget in a postorder traversal of the
* view tree that contains the point. Thus more deeply nested floating views
* are preferred over their ancestors, and floating views earlier in the
* view hierarchy (i.e., added later) are preferred over their siblings.
* This is adequate for finding the "topmost" floating view under a point,
* given that floating views don't supporting having a specific z-index.
*
* We cannot exit early when aPt is outside the view bounds, because floating
* views aren't necessarily included in their parent's bounds, so this could
* traverse the entire view hierarchy --- use carefully.
*/
static nsView* FindFloatingViewContaining(nsView* aView, nsPoint aPt)
{
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindFloatingViewContaining(v, aPt - v->GetOffsetTo(aView));
if (r)
return r;
}
if (aView->GetFloating() && aView->HasWidget() &&
aView->GetDimensions().Contains(aPt) && IsViewVisible(aView))
return aView;
return nsnull;
}
void
nsViewManager::ProcessSynthMouseMoveEvent(PRBool aFromScroll)
{
// allow new event to be posted while handling this one only if the
// source of the event is a scroll (to prevent infinite reflow loops)
if (aFromScroll)
mSynthMouseMoveEvent.Forget();
NS_ASSERTION(IsRootVM(), "Only the root view manager should be here");
if (mMouseLocation == nsPoint(NSCOORD_NONE, NSCOORD_NONE) || !mRootView) {
mSynthMouseMoveEvent.Forget();
return;
}
// Hold a ref to ourselves so DispatchEvent won't destroy us (since
// we need to access members after we call DispatchEvent).
nsCOMPtr<nsIViewManager> kungFuDeathGrip(this);
#ifdef DEBUG_MOUSE_LOCATION
printf("[vm=%p]synthesizing mouse move to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
nsPoint pt = mMouseLocation;
PRInt32 p2a = mContext->AppUnitsPerDevPixel();
pt.x = NSIntPixelsToAppUnits(mMouseLocation.x, p2a);
pt.y = NSIntPixelsToAppUnits(mMouseLocation.y, p2a);
// This could be a bit slow (traverses entire view hierarchy)
// but it's OK to do it once per synthetic mouse event
nsView* view = FindFloatingViewContaining(mRootView, pt);
nsPoint offset(0, 0);
if (!view) {
view = mRootView;
} else {
offset = view->GetOffsetTo(mRootView);
offset.x = NSAppUnitsToIntPixels(offset.x, p2a);
offset.y = NSAppUnitsToIntPixels(offset.y, p2a);
}
nsMouseEvent event(PR_TRUE, NS_MOUSE_MOVE, view->GetWidget(),
nsMouseEvent::eSynthesized);
event.refPoint = mMouseLocation - offset;
event.time = PR_IntervalNow();
// XXX set event.isShift, event.isControl, event.isAlt, event.isMeta ?
nsEventStatus status;
view->GetViewManager()->DispatchEvent(&event, &status);
if (!aFromScroll)
mSynthMouseMoveEvent.Forget();
}
void
nsViewManager::InvalidateHierarchy()
{
if (mRootView) {
if (!IsRootVM()) {
NS_RELEASE(mRootViewManager);
}
nsView *parent = mRootView->GetParent();
if (parent) {
mRootViewManager = parent->GetViewManager()->RootViewManager();
NS_ADDREF(mRootViewManager);
NS_ASSERTION(mRootViewManager != this,
"Root view had a parent, but it has the same view manager");
} else {
mRootViewManager = this;
}
}
}
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