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gecko/layout/mathml/nsMathMLmactionFrame.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 MathML Project.
*
* The Initial Developer of the Original Code is
* The University Of Queensland.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roger B. Sidje <rbs@maths.uq.edu.au>
*
* 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 ***** */
#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsINameSpaceManager.h"
#include "nsCSSRendering.h"
#include "prprf.h" // For PR_snprintf()
#include "nsIDocShellTreeItem.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIWebBrowserChrome.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIDOMElement.h"
#include "nsIDOMEventTarget.h"
#include "nsMathMLmactionFrame.h"
#include "nsAutoPtr.h"
#include "nsStyleSet.h"
#include "nsDisplayList.h"
#include "nsContentUtils.h"
//
// <maction> -- bind actions to a subexpression - implementation
//
#define NS_MATHML_ACTION_TYPE_NONE 0
#define NS_MATHML_ACTION_TYPE_TOGGLE 1
#define NS_MATHML_ACTION_TYPE_STATUSLINE 2
#define NS_MATHML_ACTION_TYPE_TOOLTIP 3 // unsupported
nsIFrame*
NS_NewMathMLmactionFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmactionFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmactionFrame)
nsMathMLmactionFrame::~nsMathMLmactionFrame()
{
// unregister us as a mouse event listener ...
// printf("maction:%p unregistering as mouse event listener ...\n", this);
if (mListener) {
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("click"), mListener,
false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mouseover"), mListener,
false);
mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mouseout"), mListener,
false);
}
}
NS_IMETHODIMP
nsMathMLmactionFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsAutoString value, prefix;
// Init our local attributes
mChildCount = -1; // these will be updated in GetSelectedFrame()
mSelection = 0;
mSelectedFrame = nsnull;
nsRefPtr<nsStyleContext> newStyleContext;
mActionType = NS_MATHML_ACTION_TYPE_NONE;
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::actiontype_, value);
if (!value.IsEmpty()) {
if (value.EqualsLiteral("toggle"))
mActionType = NS_MATHML_ACTION_TYPE_TOGGLE;
// XXX use goto to jump out of these if?
if (NS_MATHML_ACTION_TYPE_NONE == mActionType) {
// expected tooltip prefix (8ch)...
if (8 < value.Length() && 0 == value.Find("tooltip#"))
mActionType = NS_MATHML_ACTION_TYPE_TOOLTIP;
}
if (NS_MATHML_ACTION_TYPE_NONE == mActionType) {
// expected statusline prefix (11ch)...
if (11 < value.Length() && 0 == value.Find("statusline#"))
mActionType = NS_MATHML_ACTION_TYPE_STATUSLINE;
}
}
// Let the base class do the rest
return nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
NS_IMETHODIMP
nsMathMLmactionFrame::TransmitAutomaticData() {
// The REC defines the following element to be space-like:
// * an maction element whose selected sub-expression exists and is
// space-like;
nsIMathMLFrame* mathMLFrame = do_QueryFrame(mSelectedFrame);
if (mathMLFrame && mathMLFrame->IsSpaceLike()) {
mPresentationData.flags |= NS_MATHML_SPACE_LIKE;
} else {
mPresentationData.flags &= ~NS_MATHML_SPACE_LIKE;
}
// The REC defines the following element to be an embellished operator:
// * an maction element whose selected sub-expression exists and is an
// embellished operator;
mPresentationData.baseFrame = mSelectedFrame;
GetEmbellishDataFrom(mSelectedFrame, mEmbellishData);
return NS_OK;
}
nsresult
nsMathMLmactionFrame::ChildListChanged(PRInt32 aModType)
{
// update cached values
mChildCount = -1;
mSelection = 0;
mSelectedFrame = nsnull;
GetSelectedFrame();
return nsMathMLContainerFrame::ChildListChanged(aModType);
}
// return the frame whose number is given by the attribute selection="number"
nsIFrame*
nsMathMLmactionFrame::GetSelectedFrame()
{
nsAutoString value;
PRInt32 selection;
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::selection_,
value);
if (!value.IsEmpty()) {
PRInt32 errorCode;
selection = value.ToInteger(&errorCode);
if (NS_FAILED(errorCode))
selection = 1;
}
else selection = 1; // default is first frame
if (-1 != mChildCount) { // we have been in this function before...
// cater for invalid user-supplied selection
if (selection > mChildCount || selection < 1)
selection = 1;
// quick return if it is identical with our cache
if (selection == mSelection)
return mSelectedFrame;
}
// get the selected child and cache new values...
PRInt32 count = 0;
nsIFrame* childFrame = mFrames.FirstChild();
while (childFrame) {
if (!mSelectedFrame)
mSelectedFrame = childFrame; // default is first child
if (++count == selection)
mSelectedFrame = childFrame;
childFrame = childFrame->GetNextSibling();
}
// cater for invalid user-supplied selection
if (selection > count || selection < 1)
selection = 1;
mChildCount = count;
mSelection = selection;
return mSelectedFrame;
}
NS_IMETHODIMP
nsMathMLmactionFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
nsresult rv = nsMathMLContainerFrame::SetInitialChildList(aListID, aChildList);
// This very first call to GetSelectedFrame() will cause us to be marked as an
// embellished operator if the selected child is an embellished operator
if (!GetSelectedFrame()) {
mActionType = NS_MATHML_ACTION_TYPE_NONE;
}
else {
// create mouse event listener and register it
mListener = new nsMathMLmactionFrame::MouseListener(this);
// printf("maction:%p registering as mouse event listener ...\n", this);
mContent->AddSystemEventListener(NS_LITERAL_STRING("click"), mListener,
false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mouseover"), mListener,
false, false);
mContent->AddSystemEventListener(NS_LITERAL_STRING("mouseout"), mListener,
false, false);
}
return rv;
}
// Only paint the selected child...
NS_IMETHODIMP
nsMathMLmactionFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
nsresult rv = DisplayBorderBackgroundOutline(aBuilder, aLists);
NS_ENSURE_SUCCESS(rv, rv);
nsIFrame* childFrame = GetSelectedFrame();
if (childFrame) {
// Put the child's background directly onto the content list
nsDisplayListSet set(aLists, aLists.Content());
// The children should be in content order
rv = BuildDisplayListForChild(aBuilder, childFrame, aDirtyRect, set);
NS_ENSURE_SUCCESS(rv, rv);
}
#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
// visual debug
rv = DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists);
#endif
return rv;
}
// Only reflow the selected child ...
NS_IMETHODIMP
nsMathMLmactionFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
aStatus = NS_FRAME_COMPLETE;
aDesiredSize.width = aDesiredSize.height = 0;
aDesiredSize.ascent = 0;
mBoundingMetrics = nsBoundingMetrics();
nsIFrame* childFrame = GetSelectedFrame();
if (childFrame) {
nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState childReflowState(aPresContext, aReflowState,
childFrame, availSize);
rv = ReflowChild(childFrame, aPresContext, aDesiredSize,
childReflowState, aStatus);
SaveReflowAndBoundingMetricsFor(childFrame, aDesiredSize,
aDesiredSize.mBoundingMetrics);
mBoundingMetrics = aDesiredSize.mBoundingMetrics;
}
FinalizeReflow(*aReflowState.rendContext, aDesiredSize);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
return rv;
}
// Only place the selected child ...
/* virtual */ nsresult
nsMathMLmactionFrame::Place(nsRenderingContext& aRenderingContext,
bool aPlaceOrigin,
nsHTMLReflowMetrics& aDesiredSize)
{
aDesiredSize.width = aDesiredSize.height = 0;
aDesiredSize.ascent = 0;
mBoundingMetrics = nsBoundingMetrics();
nsIFrame* childFrame = GetSelectedFrame();
if (childFrame) {
GetReflowAndBoundingMetricsFor(childFrame, aDesiredSize, mBoundingMetrics);
if (aPlaceOrigin) {
FinishReflowChild(childFrame, PresContext(), nsnull, aDesiredSize, 0, 0, 0);
}
mReference.x = 0;
mReference.y = aDesiredSize.ascent;
}
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
return NS_OK;
}
// ################################################################
// Event handlers
// ################################################################
NS_IMPL_ISUPPORTS1(nsMathMLmactionFrame::MouseListener,
nsIDOMEventListener)
// helper to show a msg on the status bar
// curled from nsObjectFrame.cpp ...
void
ShowStatus(nsPresContext* aPresContext, nsString& aStatusMsg)
{
nsCOMPtr<nsISupports> cont = aPresContext->GetContainer();
if (cont) {
nsCOMPtr<nsIDocShellTreeItem> docShellItem(do_QueryInterface(cont));
if (docShellItem) {
nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
docShellItem->GetTreeOwner(getter_AddRefs(treeOwner));
if (treeOwner) {
nsCOMPtr<nsIWebBrowserChrome> browserChrome(do_GetInterface(treeOwner));
if (browserChrome) {
browserChrome->SetStatus(nsIWebBrowserChrome::STATUS_LINK, aStatusMsg.get());
}
}
}
}
}
NS_IMETHODIMP
nsMathMLmactionFrame::MouseListener::HandleEvent(nsIDOMEvent* aEvent)
{
nsAutoString eventType;
aEvent->GetType(eventType);
if (eventType.EqualsLiteral("mouseover")) {
mOwner->MouseOver();
}
else if (eventType.EqualsLiteral("click")) {
mOwner->MouseClick();
}
else if (eventType.EqualsLiteral("mouseout")) {
mOwner->MouseOut();
}
else {
NS_ABORT();
}
return NS_OK;
}
void
nsMathMLmactionFrame::MouseOver()
{
// see if we should display a status message
if (NS_MATHML_ACTION_TYPE_STATUSLINE == mActionType) {
nsAutoString value;
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::actiontype_, value);
// expected statusline prefix (11ch)...
if (11 < value.Length() && 0 == value.Find("statusline#")) {
value.Cut(0, 11);
ShowStatus(PresContext(), value);
}
}
}
void
nsMathMLmactionFrame::MouseOut()
{
// see if we should remove the status message
if (NS_MATHML_ACTION_TYPE_STATUSLINE == mActionType) {
nsAutoString value;
value.SetLength(0);
ShowStatus(PresContext(), value);
}
}
void
nsMathMLmactionFrame::MouseClick()
{
if (NS_MATHML_ACTION_TYPE_TOGGLE == mActionType) {
if (mChildCount > 1) {
PRInt32 selection = (mSelection == mChildCount)? 1 : mSelection + 1;
nsAutoString value;
char cbuf[10];
PR_snprintf(cbuf, sizeof(cbuf), "%d", selection);
value.AssignASCII(cbuf);
bool notify = false; // don't yet notify the document
mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::selection_, value, notify);
// Now trigger a content-changed reflow...
PresContext()->PresShell()->
FrameNeedsReflow(mSelectedFrame, nsIPresShell::eTreeChange,
NS_FRAME_IS_DIRTY);
}
}
}
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