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gecko-dev/layout/mathml/nsMathMLmactionFrame.cpp
Frédéric Wang f5b2f9c1aa Bug 745131 - Improve how <semantics> determine the visible child. r=karlt 
--HG--
rename : layout/mathml/nsMathMLmactionFrame.cpp => layout/mathml/nsMathMLSelectedFrame.cpp
rename : layout/mathml/nsMathMLmactionFrame.h => layout/mathml/nsMathMLSelectedFrame.h
2013-05-10 08:40:44 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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 "nsTextFragment.h"
#include "nsMathMLmactionFrame.h"
#include "nsAutoPtr.h"
#include "nsStyleSet.h"
#include "nsDisplayList.h"
//
// <maction> -- bind actions to a subexpression - implementation
//
enum nsMactionActionTypes {
NS_MATHML_ACTION_TYPE_CLASS_ERROR = 0x10,
NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION = 0x20,
NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION = 0x40,
NS_MATHML_ACTION_TYPE_CLASS_BITMASK = 0xF0,
NS_MATHML_ACTION_TYPE_NONE = NS_MATHML_ACTION_TYPE_CLASS_ERROR|0x01,
NS_MATHML_ACTION_TYPE_TOGGLE = NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION|0x01,
NS_MATHML_ACTION_TYPE_UNKNOWN = NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION|0x02,
NS_MATHML_ACTION_TYPE_STATUSLINE = NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION|0x01,
NS_MATHML_ACTION_TYPE_TOOLTIP = NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION|0x02
};
// helper function to parse actiontype attribute
static int32_t
GetActionType(nsIContent* aContent)
{
nsAutoString value;
if (aContent) {
if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::actiontype_, value))
return NS_MATHML_ACTION_TYPE_NONE;
}
if (value.EqualsLiteral("toggle"))
return NS_MATHML_ACTION_TYPE_TOGGLE;
if (value.EqualsLiteral("statusline"))
return NS_MATHML_ACTION_TYPE_STATUSLINE;
if (value.EqualsLiteral("tooltip"))
return NS_MATHML_ACTION_TYPE_TOOLTIP;
return NS_MATHML_ACTION_TYPE_UNKNOWN;
}
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);
}
}
void
nsMathMLmactionFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
// Init our local attributes
mChildCount = -1; // these will be updated in GetSelectedFrame()
mActionType = GetActionType(aContent);
// Let the base class do the rest
return nsMathMLSelectedFrame::Init(aContent, aParent, aPrevInFlow);
}
nsresult
nsMathMLmactionFrame::ChildListChanged(int32_t aModType)
{
// update cached values
mChildCount = -1;
mSelectedFrame = nullptr;
return nsMathMLSelectedFrame::ChildListChanged(aModType);
}
// return the frame whose number is given by the attribute selection="number"
nsIFrame*
nsMathMLmactionFrame::GetSelectedFrame()
{
nsAutoString value;
int32_t selection;
if ((mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) ==
NS_MATHML_ACTION_TYPE_CLASS_ERROR) {
mSelection = -1;
mInvalidMarkup = true;
mSelectedFrame = nullptr;
return mSelectedFrame;
}
// Selection is not applied to tooltip and statusline.
// Thereby return the first child.
if ((mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) ==
NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION) {
// We don't touch mChildCount here. It's incorrect to assign it 1,
// and it's inefficient to count the children. It's fine to leave
// it be equal -1 because it's not used with other actiontypes.
mSelection = 1;
mInvalidMarkup = false;
mSelectedFrame = mFrames.FirstChild();
return mSelectedFrame;
}
GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::selection_,
value);
if (!value.IsEmpty()) {
nsresult 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...
int32_t 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;
mInvalidMarkup = (mSelection == -1);
TransmitAutomaticData();
return mSelectedFrame;
}
NS_IMETHODIMP
nsMathMLmactionFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
nsresult rv = nsMathMLSelectedFrame::SetInitialChildList(aListID, aChildList);
if (!mSelectedFrame) {
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;
}
NS_IMETHODIMP
nsMathMLmactionFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
bool needsReflow = false;
if (aAttribute == nsGkAtoms::actiontype_) {
// updating mActionType ...
int32_t oldActionType = mActionType;
mActionType = GetActionType(mContent);
// Initiate a reflow when actiontype classes are different.
if ((oldActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) !=
(mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK)) {
needsReflow = true;
}
} else if (aAttribute == nsGkAtoms::selection_) {
if ((mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) ==
NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION) {
needsReflow = true;
}
} else {
// let the base class handle other attribute changes
return
nsMathMLContainerFrame::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
if (needsReflow) {
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_IS_DIRTY);
}
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) {
// retrieve content from a second child if it exists
nsIFrame* childFrame = mFrames.FrameAt(1);
if (!childFrame) return;
nsIContent* content = childFrame->GetContent();
if (!content) return;
// check whether the content is mtext or not
if (content->GetNameSpaceID() == kNameSpaceID_MathML &&
content->Tag() == nsGkAtoms::mtext_) {
// get the text to be displayed
content = content->GetFirstChild();
if (!content) return;
const nsTextFragment* textFrg = content->GetText();
if (!textFrg) return;
nsAutoString text;
textFrg->AppendTo(text);
// collapse whitespaces as listed in REC, section 3.2.6.1
text.CompressWhitespace();
ShowStatus(PresContext(), text);
}
}
}
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) {
int32_t 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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