mirror of
https://github.com/mozilla/gecko-dev.git
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348 lines
11 KiB
C++
348 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsMathMLmactionFrame.h"
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#include "nsCOMPtr.h"
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#include "nsPresContext.h"
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#include "nsINameSpaceManager.h"
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#include "prprf.h" // For PR_snprintf()
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#include "nsIDocShellTreeItem.h"
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#include "nsIDocShellTreeOwner.h"
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#include "nsIWebBrowserChrome.h"
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#include "nsIInterfaceRequestorUtils.h"
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#include "nsTextFragment.h"
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#include "nsIDOMEvent.h"
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#include "mozilla/gfx/2D.h"
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//
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// <maction> -- bind actions to a subexpression - implementation
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//
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enum nsMactionActionTypes {
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NS_MATHML_ACTION_TYPE_CLASS_ERROR = 0x10,
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NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION = 0x20,
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NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION = 0x40,
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NS_MATHML_ACTION_TYPE_CLASS_BITMASK = 0xF0,
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NS_MATHML_ACTION_TYPE_NONE = NS_MATHML_ACTION_TYPE_CLASS_ERROR|0x01,
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NS_MATHML_ACTION_TYPE_TOGGLE = NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION|0x01,
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NS_MATHML_ACTION_TYPE_UNKNOWN = NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION|0x02,
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NS_MATHML_ACTION_TYPE_STATUSLINE = NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION|0x01,
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NS_MATHML_ACTION_TYPE_TOOLTIP = NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION|0x02
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};
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// helper function to parse actiontype attribute
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static int32_t
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GetActionType(nsIContent* aContent)
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{
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nsAutoString value;
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if (aContent) {
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if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::actiontype_, value))
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return NS_MATHML_ACTION_TYPE_NONE;
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}
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if (value.EqualsLiteral("toggle"))
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return NS_MATHML_ACTION_TYPE_TOGGLE;
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if (value.EqualsLiteral("statusline"))
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return NS_MATHML_ACTION_TYPE_STATUSLINE;
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if (value.EqualsLiteral("tooltip"))
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return NS_MATHML_ACTION_TYPE_TOOLTIP;
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return NS_MATHML_ACTION_TYPE_UNKNOWN;
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}
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nsIFrame*
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NS_NewMathMLmactionFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLmactionFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmactionFrame)
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nsMathMLmactionFrame::~nsMathMLmactionFrame()
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{
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// unregister us as a mouse event listener ...
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// printf("maction:%p unregistering as mouse event listener ...\n", this);
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if (mListener) {
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mContent->RemoveSystemEventListener(NS_LITERAL_STRING("click"), mListener,
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false);
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mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mouseover"), mListener,
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false);
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mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mouseout"), mListener,
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false);
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}
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}
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void
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nsMathMLmactionFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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// Init our local attributes
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mChildCount = -1; // these will be updated in GetSelectedFrame()
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mActionType = GetActionType(aContent);
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// Let the base class do the rest
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return nsMathMLSelectedFrame::Init(aContent, aParent, aPrevInFlow);
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}
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nsresult
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nsMathMLmactionFrame::ChildListChanged(int32_t aModType)
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{
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// update cached values
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mChildCount = -1;
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mSelectedFrame = nullptr;
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return nsMathMLSelectedFrame::ChildListChanged(aModType);
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}
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// return the frame whose number is given by the attribute selection="number"
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nsIFrame*
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nsMathMLmactionFrame::GetSelectedFrame()
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{
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nsAutoString value;
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int32_t selection;
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if ((mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) ==
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NS_MATHML_ACTION_TYPE_CLASS_ERROR) {
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mSelection = -1;
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mInvalidMarkup = true;
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mSelectedFrame = nullptr;
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return mSelectedFrame;
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}
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// Selection is not applied to tooltip and statusline.
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// Thereby return the first child.
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if ((mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) ==
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NS_MATHML_ACTION_TYPE_CLASS_IGNORE_SELECTION) {
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// We don't touch mChildCount here. It's incorrect to assign it 1,
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// and it's inefficient to count the children. It's fine to leave
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// it be equal -1 because it's not used with other actiontypes.
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mSelection = 1;
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mInvalidMarkup = false;
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mSelectedFrame = mFrames.FirstChild();
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return mSelectedFrame;
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}
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GetAttribute(mContent, mPresentationData.mstyle, nsGkAtoms::selection_,
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value);
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if (!value.IsEmpty()) {
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nsresult errorCode;
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selection = value.ToInteger(&errorCode);
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if (NS_FAILED(errorCode))
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selection = 1;
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}
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else selection = 1; // default is first frame
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if (-1 != mChildCount) { // we have been in this function before...
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// cater for invalid user-supplied selection
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if (selection > mChildCount || selection < 1)
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selection = -1;
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// quick return if it is identical with our cache
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if (selection == mSelection)
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return mSelectedFrame;
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}
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// get the selected child and cache new values...
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int32_t count = 0;
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nsIFrame* childFrame = mFrames.FirstChild();
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while (childFrame) {
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if (!mSelectedFrame)
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mSelectedFrame = childFrame; // default is first child
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if (++count == selection)
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mSelectedFrame = childFrame;
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childFrame = childFrame->GetNextSibling();
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}
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// cater for invalid user-supplied selection
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if (selection > count || selection < 1)
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selection = -1;
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mChildCount = count;
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mSelection = selection;
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mInvalidMarkup = (mSelection == -1);
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TransmitAutomaticData();
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return mSelectedFrame;
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::SetInitialChildList(ChildListID aListID,
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nsFrameList& aChildList)
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{
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nsresult rv = nsMathMLSelectedFrame::SetInitialChildList(aListID, aChildList);
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if (!mSelectedFrame) {
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mActionType = NS_MATHML_ACTION_TYPE_NONE;
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}
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else {
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// create mouse event listener and register it
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mListener = new nsMathMLmactionFrame::MouseListener(this);
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// printf("maction:%p registering as mouse event listener ...\n", this);
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mContent->AddSystemEventListener(NS_LITERAL_STRING("click"), mListener,
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false, false);
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mContent->AddSystemEventListener(NS_LITERAL_STRING("mouseover"), mListener,
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false, false);
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mContent->AddSystemEventListener(NS_LITERAL_STRING("mouseout"), mListener,
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false, false);
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}
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return rv;
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType)
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{
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bool needsReflow = false;
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if (aAttribute == nsGkAtoms::actiontype_) {
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// updating mActionType ...
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int32_t oldActionType = mActionType;
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mActionType = GetActionType(mContent);
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// Initiate a reflow when actiontype classes are different.
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if ((oldActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) !=
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(mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK)) {
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needsReflow = true;
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}
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} else if (aAttribute == nsGkAtoms::selection_) {
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if ((mActionType & NS_MATHML_ACTION_TYPE_CLASS_BITMASK) ==
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NS_MATHML_ACTION_TYPE_CLASS_USE_SELECTION) {
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needsReflow = true;
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}
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} else {
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// let the base class handle other attribute changes
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return
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nsMathMLContainerFrame::AttributeChanged(aNameSpaceID,
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aAttribute, aModType);
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}
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if (needsReflow) {
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PresContext()->PresShell()->
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FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_IS_DIRTY);
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}
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return NS_OK;
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}
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// ################################################################
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// Event handlers
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// ################################################################
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NS_IMPL_ISUPPORTS1(nsMathMLmactionFrame::MouseListener,
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nsIDOMEventListener)
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// helper to show a msg on the status bar
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// curled from nsObjectFrame.cpp ...
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void
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ShowStatus(nsPresContext* aPresContext, nsString& aStatusMsg)
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{
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nsCOMPtr<nsISupports> cont = aPresContext->GetContainer();
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if (cont) {
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nsCOMPtr<nsIDocShellTreeItem> docShellItem(do_QueryInterface(cont));
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if (docShellItem) {
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nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
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docShellItem->GetTreeOwner(getter_AddRefs(treeOwner));
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if (treeOwner) {
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nsCOMPtr<nsIWebBrowserChrome> browserChrome(do_GetInterface(treeOwner));
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if (browserChrome) {
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browserChrome->SetStatus(nsIWebBrowserChrome::STATUS_LINK, aStatusMsg.get());
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}
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}
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}
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}
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::MouseListener::HandleEvent(nsIDOMEvent* aEvent)
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{
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nsAutoString eventType;
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aEvent->GetType(eventType);
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if (eventType.EqualsLiteral("mouseover")) {
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mOwner->MouseOver();
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}
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else if (eventType.EqualsLiteral("click")) {
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mOwner->MouseClick();
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}
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else if (eventType.EqualsLiteral("mouseout")) {
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mOwner->MouseOut();
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}
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else {
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NS_ABORT();
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}
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return NS_OK;
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}
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void
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nsMathMLmactionFrame::MouseOver()
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{
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// see if we should display a status message
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if (NS_MATHML_ACTION_TYPE_STATUSLINE == mActionType) {
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// retrieve content from a second child if it exists
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nsIFrame* childFrame = mFrames.FrameAt(1);
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if (!childFrame) return;
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nsIContent* content = childFrame->GetContent();
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if (!content) return;
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// check whether the content is mtext or not
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if (content->GetNameSpaceID() == kNameSpaceID_MathML &&
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content->Tag() == nsGkAtoms::mtext_) {
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// get the text to be displayed
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content = content->GetFirstChild();
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if (!content) return;
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const nsTextFragment* textFrg = content->GetText();
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if (!textFrg) return;
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nsAutoString text;
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textFrg->AppendTo(text);
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// collapse whitespaces as listed in REC, section 3.2.6.1
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text.CompressWhitespace();
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ShowStatus(PresContext(), text);
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}
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}
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}
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void
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nsMathMLmactionFrame::MouseOut()
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{
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// see if we should remove the status message
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if (NS_MATHML_ACTION_TYPE_STATUSLINE == mActionType) {
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nsAutoString value;
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value.SetLength(0);
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ShowStatus(PresContext(), value);
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}
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}
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void
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nsMathMLmactionFrame::MouseClick()
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{
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if (NS_MATHML_ACTION_TYPE_TOGGLE == mActionType) {
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if (mChildCount > 1) {
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int32_t selection = (mSelection == mChildCount)? 1 : mSelection + 1;
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nsAutoString value;
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char cbuf[10];
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PR_snprintf(cbuf, sizeof(cbuf), "%d", selection);
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value.AssignASCII(cbuf);
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bool notify = false; // don't yet notify the document
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mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::selection_, value, notify);
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// Now trigger a content-changed reflow...
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PresContext()->PresShell()->
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FrameNeedsReflow(mSelectedFrame, nsIPresShell::eTreeChange,
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NS_FRAME_IS_DIRTY);
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}
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}
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}
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