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gecko/view/public/nsIViewManager.h

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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):
*
* 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 ***** */
#ifndef nsIViewManager_h___
#define nsIViewManager_h___
#include "nscore.h"
#include "nsIView.h"
#include "nsEvent.h"
#include "nsIRenderingContext.h"
class nsIScrollableView;
class nsIWidget;
struct nsRect;
class nsRegion;
class nsIDeviceContext;
class nsIViewObserver;
enum nsRectVisibility {
nsRectVisibility_kVisible,
nsRectVisibility_kAboveViewport,
nsRectVisibility_kBelowViewport,
nsRectVisibility_kLeftOfViewport,
nsRectVisibility_kRightOfViewport,
nsRectVisibility_kZeroAreaRect
};
#define NS_IVIEWMANAGER_IID \
{ 0xe1f3095c, 0x65cd, 0x46e1, \
{ 0x9d, 0x70, 0x88, 0xcf, 0x54, 0x19, 0x9d, 0x05 } }
class nsIViewManager : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IVIEWMANAGER_IID)
/**
* Initialize the ViewManager
* Note: this instance does not hold a reference to the viewobserver
* because it holds a reference to this instance.
* @result The result of the initialization, NS_OK if no errors
*/
NS_IMETHOD Init(nsIDeviceContext* aContext) = 0;
/**
* Create an ordinary view
* @param aBounds initial bounds for view
* XXX We should eliminate this parameter; you can set the bounds after CreateView
* @param aParent intended parent for view. this is not actually set in the
* nsIView through this method. it is only used by the initialization
* code to walk up the view tree, if necessary, to find resources.
* XXX We should eliminate this parameter!
* @param aVisibilityFlag initial visibility state of view
* XXX We should eliminate this parameter; you can set it after CreateView
* @result The new view
*/
NS_IMETHOD_(nsIView*) CreateView(const nsRect& aBounds,
const nsIView* aParent,
nsViewVisibility aVisibilityFlag = nsViewVisibility_kShow) = 0;
/**
* Create an scrollable view
* @param aBounds initial bounds for view
* XXX We should eliminate this parameter; you can set the bounds after CreateScrollableView
* @param aParent intended parent for view. this is not actually set in the
* nsIView through this method. it is only used by the initialization
* code to walk up the view tree, if necessary, to find resources.
* XXX We should eliminate this parameter!
* @result The new view
*/
NS_IMETHOD_(nsIScrollableView*) CreateScrollableView(const nsRect& aBounds,
const nsIView* aParent) = 0;
/**
* Get the root of the view tree.
* @result the root view
*/
NS_IMETHOD GetRootView(nsIView *&aView) = 0;
/**
* Set the root of the view tree. Does not destroy the current root view.
* aView may have a parent view managed by a different view manager.
* aView may have a widget (anything but printing) or may not (printing).
* @param aView view to set as root
*/
NS_IMETHOD SetRootView(nsIView *aView) = 0;
/**
* Get the dimensions of the root window. The dimensions are in
* twips
* @param aWidth out parameter for width of window in twips
* @param aHeight out parameter for height of window in twips
*/
NS_IMETHOD GetWindowDimensions(nscoord *aWidth, nscoord *aHeight) = 0;
/**
* Set the dimensions of the root window.
* Called if the root window is resized. The dimensions are in
* twips
* @param aWidth of window in twips
* @param aHeight of window in twips
*/
NS_IMETHOD SetWindowDimensions(nscoord aWidth, nscoord aHeight) = 0;
/**
* Do any resizes that are pending.
*/
NS_IMETHOD FlushDelayedResize() = 0;
/**
* Called to force a redrawing of any dirty areas.
*/
// XXXbz why is this exposed? Shouldn't update view batches handle this?
// It's not like Composite() does what's expected inside a view update batch
// anyway, since dirty areas may not have been invalidated on the widget yet
// and widget changes may not have been propagated yet. Maybe this should
// call FlushPendingInvalidates()?
NS_IMETHOD Composite(void) = 0;
/**
* Called to inform the view manager that the entire area of a view
* is dirty and needs to be redrawn.
* @param aView view to paint. should be root view
* @param aUpdateFlags see bottom of nsIViewManager.h for description
*/
NS_IMETHOD UpdateView(nsIView *aView, PRUint32 aUpdateFlags) = 0;
/**
* Called to inform the view manager that some portion of a view
* is dirty and needs to be redrawn. The rect passed in
* should be in the view's coordinate space.
* @param aView view to paint. should be root view
* @param rect rect to mark as damaged
* @param aUpdateFlags see bottom of nsIViewManager.h for description
*/
NS_IMETHOD UpdateView(nsIView *aView, const nsRect &aRect, PRUint32 aUpdateFlags) = 0;
/**
* Called to inform the view manager that it should redraw all views.
* @param aView view to paint. should be root view
* @param aUpdateFlags see bottom of nsIViewManager.h for description
*/
NS_IMETHOD UpdateAllViews(PRUint32 aUpdateFlags) = 0;
/**
* Called to dispatch an event to the appropriate view. Often called
* as a result of receiving a mouse or keyboard event from the widget
* event system.
* @param aEvent event to dispatch
* @param aViewTarget dispatch the event to this view
* @param aStatus event handling status
*/
NS_IMETHOD DispatchEvent(nsGUIEvent *aEvent,
nsIView* aViewTarget, nsEventStatus* aStatus) = 0;
/**
* Given a parent view, insert another view as its child.
* aSibling and aAbove control the "document order" for the insertion.
* If aSibling is null, the view is inserted at the end of the document order
* if aAfter is PR_TRUE, otherwise it is inserted at the beginning.
* If aSibling is non-null, then if aAfter is PR_TRUE, the view is inserted
* after the sibling in document order (appearing above the sibling unless
* overriden by z-order).
* If it is PR_FALSE, the view is inserted before the sibling.
* The view manager generates the appopriate dirty regions.
* @param aParent parent view
* @param aChild child view
* @param aSibling sibling view
* @param aAfter after or before in the document order
*/
NS_IMETHOD InsertChild(nsIView *aParent, nsIView *aChild, nsIView *aSibling,
PRBool aAfter) = 0;
/**
* Remove a specific child view from its parent. This will NOT remove its placeholder
* if there is one.
* The view manager generates the appropriate dirty regions.
* @param aParent parent view
* @param aChild child view
*/
NS_IMETHOD RemoveChild(nsIView *aChild) = 0;
/**
* Move a view to the specified position, provided in parent coordinates.
* The new position is the (0, 0) origin for the view's coordinate system.
* The view's bounds may extend above or to the left of this point.
* The view manager generates the appropriate dirty regions.
* @param aView view to move
* @param aX x value for new view position
* @param aY y value for new view position
*/
NS_IMETHOD MoveViewTo(nsIView *aView, nscoord aX, nscoord aY) = 0;
/**
* Resize a view. In addition to setting the width and height, you can
* set the x and y of its bounds relative to its position. Negative x and y
* will let the view extend above and to the left of the (0,0) point in its
* coordinate system.
* The view manager generates the appropriate dirty regions.
* @param aView view to move
* @param the new bounds relative to the current position
* @param RepaintExposedAreaOnly
* if PR_TRUE Repaint only the expanded or contracted region,
* if PR_FALSE Repaint the union of the old and new rectangles.
*/
NS_IMETHOD ResizeView(nsIView *aView, const nsRect &aRect,
PRBool aRepaintExposedAreaOnly = PR_FALSE) = 0;
/**
* Set the visibility of a view. Hidden views have the effect of hiding
* their descendants as well. This does not affect painting, so layout
* is responsible for ensuring that content in hidden views is not
* painted nor handling events. It does affect the visibility of widgets;
* if a view is hidden, descendant views with widgets have their widgets
* hidden.
* The view manager generates the appropriate dirty regions.
* @param aView view to change visibility state of
* @param visible new visibility state
*/
NS_IMETHOD SetViewVisibility(nsIView *aView, nsViewVisibility aVisible) = 0;
/**
* Set the z-index of a view. Positive z-indices mean that a view
* is above its parent in z-order. Negative z-indices mean that a
* view is below its parent.
* The view manager generates the appropriate dirty regions.
* @param aAutoZIndex indicate that the z-index of a view is "auto". An "auto" z-index
* means that the view does not define a new stacking context,
* which means that the z-indicies of the view's children are
* relative to the view's siblings.
* @param aView view to change z depth of
* @param aZindex explicit z depth
* @param aTopMost used when this view is z-index:auto to compare against
* other z-index:auto views.
* PR_TRUE if the view should be topmost when compared with
* other z-index:auto views.
*/
NS_IMETHOD SetViewZIndex(nsIView *aView, PRBool aAutoZIndex, PRInt32 aZindex, PRBool aTopMost = PR_FALSE) = 0;
/**
* Set whether the view "floats" above all other views,
* which tells the compositor not to consider higher views in
* the view hierarchy that would geometrically intersect with
* this view. This is a hack, but it fixes some problems with
* views that need to be drawn in front of all other views.
*/
NS_IMETHOD SetViewFloating(nsIView *aView, PRBool aFloatingView) = 0;
/**
* Set the view observer associated with this manager
* @param aObserver - new observer
* @result error status
*/
NS_IMETHOD SetViewObserver(nsIViewObserver *aObserver) = 0;
/**
* Get the view observer associated with this manager
* @param aObserver - out parameter for observer
* @result error status
*/
NS_IMETHOD GetViewObserver(nsIViewObserver *&aObserver) = 0;
/**
* Get the device context associated with this manager
* @result device context
*/
NS_IMETHOD GetDeviceContext(nsIDeviceContext *&aContext) = 0;
/**
* prevent the view manager from refreshing.
* @return error status
*/
// XXXbz callers of this function don't seem to realize that it disables
// refresh for the entire view manager hierarchy.... Maybe it shouldn't do
// that?
NS_IMETHOD DisableRefresh(void) = 0;
/**
* allow the view manager to refresh. this may cause a synchronous
* paint to occur inside the call.
* @param aUpdateFlags see bottom of nsIViewManager.h for description
* @return error status
*/
NS_IMETHOD EnableRefresh(PRUint32 aUpdateFlags) = 0;
class NS_STACK_CLASS UpdateViewBatch {
public:
UpdateViewBatch() {}
/**
* prevents the view manager from refreshing. allows UpdateView()
* to notify widgets of damaged regions that should be repainted
* when the batch is ended. Call EndUpdateViewBatch on this object
* before it is destroyed
* @return error status
*/
UpdateViewBatch(nsIViewManager* aVM) {
if (aVM) {
mRootVM = aVM->BeginUpdateViewBatch();
}
}
~UpdateViewBatch() {
NS_ASSERTION(!mRootVM, "Someone forgot to call EndUpdateViewBatch!");
}
/**
* See the constructor, this lets you "fill in" a blank UpdateViewBatch.
*/
void BeginUpdateViewBatch(nsIViewManager* aVM) {
NS_ASSERTION(!mRootVM, "already started a batch!");
if (aVM) {
mRootVM = aVM->BeginUpdateViewBatch();
}
}
/**
* allow the view manager to refresh any damaged areas accumulated
* after the BeginUpdateViewBatch() call. this may cause a
* synchronous paint to occur inside the call if aUpdateFlags
* NS_VMREFRESH_IMMEDIATE is set.
*
* If this is not the outermost view batch command, then this does
* nothing except that the specified flags are remembered. When the
* outermost batch finally ends, we merge together all the flags for the
* inner batches in the following way:
* -- If any batch specified NS_VMREFRESH_IMMEDIATE, then we use that flag
* (i.e. there is a synchronous paint under the last EndUpdateViewBatch)
* -- Otherwise if any batch specified NS_VMREFERSH_DEFERRED, then we use
* that flag (i.e. invalidation is deferred until the processing of an
* Invalidate PLEvent)
* -- Otherwise all batches specified NS_VMREFRESH_NO_SYNC and we honor
* that; all widgets are invalidated normally and will be painted the next
* time the toolkit chooses to update them.
*
* @param aUpdateFlags see bottom of nsIViewManager.h for
* description @return error status
*/
void EndUpdateViewBatch(PRUint32 aUpdateFlags) {
if (!mRootVM)
return;
mRootVM->EndUpdateViewBatch(aUpdateFlags);
mRootVM = nsnull;
}
private:
UpdateViewBatch(const UpdateViewBatch& aOther);
const UpdateViewBatch& operator=(const UpdateViewBatch& aOther);
nsCOMPtr<nsIViewManager> mRootVM;
};
private:
friend class UpdateViewBatch;
virtual nsIViewManager* BeginUpdateViewBatch(void) = 0;
NS_IMETHOD EndUpdateViewBatch(PRUint32 aUpdateFlags) = 0;
public:
/**
* set the view that is is considered to be the root scrollable
* view for the document.
* @param aScrollable root scrollable view
* @return error status
*/
NS_IMETHOD SetRootScrollableView(nsIScrollableView *aScrollable) = 0;
/**
* get the view that is is considered to be the root scrollable
* view for the document.
* @param aScrollable out parameter for root scrollable view
* @return error status
*/
NS_IMETHOD GetRootScrollableView(nsIScrollableView **aScrollable) = 0;
/**
* Retrieve the widget at the root of the nearest enclosing
* view manager whose root view has a widget.
*/
NS_IMETHOD GetRootWidget(nsIWidget **aWidget) = 0;
/**
* Force update of view manager widget
* Callers should use UpdateView(view, NS_VMREFRESH_IMMEDIATE) in most cases instead
* @result error status
*/
// XXXbz Callers seem to be confused about this one... and it doesn't play
// right with view update batching at all (will miss updates). Maybe this
// should call FlushPendingInvalidates()?
NS_IMETHOD ForceUpdate() = 0;
/**
* Indicate whether the viewmanager is currently painting
*
* @param aPainting PR_TRUE if the viewmanager is painting
* PR_FALSE otherwise
*/
NS_IMETHOD IsPainting(PRBool& aIsPainting)=0;
/**
* Retrieve the time of the last user event. User events
* include mouse and keyboard events. The viewmanager
* saves the time of the last user event.
*
* @param aTime Last user event time in microseconds
*/
NS_IMETHOD GetLastUserEventTime(PRUint32& aTime)=0;
/**
* Determine if a rectangle specified in the view's coordinate system
* is completely, or partially visible.
* @param aView view that aRect coordinates are specified relative to
* @param aRect rectangle in twips to test for visibility
* @param aMinTwips is the min. pixel rows or cols at edge of screen
* needed for object to be counted visible
* @param aRectVisibility returns eVisible if the rect is visible,
* otherwise it returns an enum indicating why not
*/
NS_IMETHOD GetRectVisibility(nsIView *aView, const nsRect &aRect,
nscoord aMinTwips,
nsRectVisibility *aRectVisibility)=0;
/**
* Dispatch a mouse move event based on the most recent mouse
* position. This is used when the contents of the page moved
* (aFromScroll is false) or scrolled (aFromScroll is true).
*/
NS_IMETHOD SynthesizeMouseMove(PRBool aFromScroll)=0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIViewManager, NS_IVIEWMANAGER_IID)
// Paint timing mode flags
// intermediate: do no special timing processing; repaint when the
// toolkit issues an expose event (which will happen *before* PLEvent
// processing). This is essentially the default.
#define NS_VMREFRESH_NO_SYNC 0
// least immediate: we suppress invalidation, storing dirty areas in
// views, and post an Invalidate PLEvent. The Invalidate event gets
// processed after toolkit events such as window resize events!
// This is only usable with EndUpdateViewBatch and EnableRefresh.
#define NS_VMREFRESH_DEFERRED 0x0001
// most immediate: force a call to nsViewManager::Composite, which
// synchronously updates the window(s) right away before returning
#define NS_VMREFRESH_IMMEDIATE 0x0002
//animate scroll operation
#define NS_VMREFRESH_SMOOTHSCROLL 0x0008
#endif // nsIViewManager_h___
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