465 lines
16 KiB
C++
465 lines
16 KiB
C++
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla MathML Project.
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*
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* The Initial Developer of the Original Code is
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* The University Of Queensland.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Roger B. Sidje <rbs@maths.uq.edu.au>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsIPresContext.h"
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#include "nsUnitConversion.h"
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#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsINameSpaceManager.h"
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#include "nsIRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsCSSRendering.h"
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#include "prprf.h" // For PR_snprintf()
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#include "nsIWebShell.h"
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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 "nsIInterfaceRequestor.h"
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#include "nsIInterfaceRequestorUtils.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMEventReceiver.h"
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#include "nsIDOMMouseListener.h"
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#include "nsMathMLmactionFrame.h"
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#include "nsAutoPtr.h"
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#include "nsStyleSet.h"
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//
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// <maction> -- bind actions to a subexpression - implementation
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//
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#define NS_MATHML_ACTION_TYPE_NONE 0
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#define NS_MATHML_ACTION_TYPE_TOGGLE 1
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#define NS_MATHML_ACTION_TYPE_STATUSLINE 2
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#define NS_MATHML_ACTION_TYPE_TOOLTIP 3 // unsupported
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#define NS_MATHML_ACTION_TYPE_RESTYLE 4
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NS_IMPL_ADDREF_INHERITED(nsMathMLmactionFrame, nsMathMLContainerFrame)
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NS_IMPL_RELEASE_INHERITED(nsMathMLmactionFrame, nsMathMLContainerFrame)
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NS_IMPL_QUERY_INTERFACE_INHERITED1(nsMathMLmactionFrame, nsMathMLContainerFrame, nsIDOMMouseListener)
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nsresult
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NS_NewMathMLmactionFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
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{
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NS_PRECONDITION(aNewFrame, "null OUT ptr");
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if (nsnull == aNewFrame) {
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return NS_ERROR_NULL_POINTER;
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}
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nsMathMLmactionFrame* it = new (aPresShell) nsMathMLmactionFrame;
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if (nsnull == it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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*aNewFrame = it;
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return NS_OK;
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}
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nsMathMLmactionFrame::nsMathMLmactionFrame()
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{
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}
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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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nsCOMPtr<nsIDOMEventReceiver> receiver(do_QueryInterface(mContent));
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receiver->RemoveEventListenerByIID(this, NS_GET_IID(nsIDOMMouseListener));
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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nsAutoString value, prefix;
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// Init our local attributes
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mPresContext = aPresContext;
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mWasRestyled = PR_FALSE;
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mChildCount = -1; // these will be updated in GetSelectedFrame()
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mSelection = 0;
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mSelectedFrame = nsnull;
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nsRefPtr<nsStyleContext> newStyleContext;
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mActionType = NS_MATHML_ACTION_TYPE_NONE;
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if (NS_CONTENT_ATTR_HAS_VALUE == aContent->GetAttr(kNameSpaceID_None,
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nsMathMLAtoms::actiontype_, value)) {
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if (value.EqualsLiteral("toggle"))
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mActionType = NS_MATHML_ACTION_TYPE_TOGGLE;
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// XXX use goto to jump out of these if?
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if (NS_MATHML_ACTION_TYPE_NONE == mActionType) {
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// expected tooltip prefix (8ch)...
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if (8 < value.Length() && 0 == value.Find("tooltip#"))
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mActionType = NS_MATHML_ACTION_TYPE_TOOLTIP;
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}
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if (NS_MATHML_ACTION_TYPE_NONE == mActionType) {
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// expected statusline prefix (11ch)...
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if (11 < value.Length() && 0 == value.Find("statusline#"))
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mActionType = NS_MATHML_ACTION_TYPE_STATUSLINE;
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}
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if (NS_MATHML_ACTION_TYPE_NONE == mActionType) {
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// expected restyle prefix (8ch)...
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if (8 < value.Length() && 0 == value.Find("restyle#")) {
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mActionType = NS_MATHML_ACTION_TYPE_RESTYLE;
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mRestyle = value;
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// Here is the situation:
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// When the attribute [actiontype="restyle#id"] is set, the Style System has
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// given us the associated style. But we want to start with our default style.
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// So... first, remove the attribute actiontype="restyle#id"
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PRBool notify = PR_FALSE; // don't trigger a reflow yet!
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aContent->UnsetAttr(kNameSpaceID_None, nsMathMLAtoms::actiontype_, notify);
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// then, re-resolve our style
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nsStyleContext* parentStyleContext = aParent->GetStyleContext();
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newStyleContext = aPresContext->StyleSet()->
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ResolveStyleFor(aContent, parentStyleContext);
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if (!newStyleContext)
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mRestyle.Truncate();
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else {
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if (newStyleContext != aContext)
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aContext = newStyleContext;
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else
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mRestyle.Truncate();
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}
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}
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}
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}
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// Let the base class do the rest
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return nsMathMLContainerFrame::Init(aPresContext, aContent, aParent, aContext, aPrevInFlow);
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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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PRInt32 selection;
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if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttr(kNameSpaceID_None,
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nsMathMLAtoms::selection_, value)) {
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PRInt32 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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PRInt32 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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// if the selected child is an embellished operator,
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// we become embellished as well
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GetEmbellishDataFrom(mSelectedFrame, mEmbellishData);
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if (NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags)) {
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mEmbellishData.nextFrame = mSelectedFrame; // yes!
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}
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return mSelectedFrame;
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::SetInitialChildList(nsIPresContext* aPresContext,
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nsIAtom* aListName,
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nsIFrame* aChildList)
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{
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nsresult rv = nsMathMLContainerFrame::SetInitialChildList(aPresContext, aListName, aChildList);
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// This very first call to GetSelectedFrame() will cause us to be marked as an
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// embellished operator if the selected child is an embellished operator
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if (!GetSelectedFrame()) {
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mActionType = NS_MATHML_ACTION_TYPE_NONE;
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}
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else {
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// register us as a mouse event listener ...
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// printf("maction:%p registering as mouse event listener ...\n", this);
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nsCOMPtr<nsIDOMEventReceiver> receiver(do_QueryInterface(mContent));
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receiver->AddEventListenerByIID(this, NS_GET_IID(nsIDOMMouseListener));
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}
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return rv;
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}
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// Return the selected frame ...
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NS_IMETHODIMP
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nsMathMLmactionFrame::GetFrameForPoint(nsIPresContext* aPresContext,
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const nsPoint& aPoint,
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nsFramePaintLayer aWhichLayer,
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nsIFrame** aFrame)
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{
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nsIFrame* childFrame = GetSelectedFrame();
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if (childFrame) {
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nsPoint pt(aPoint.x - mRect.x, aPoint.y - mRect.y);
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return childFrame->GetFrameForPoint(aPresContext, pt, aWhichLayer, aFrame);
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}
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return nsFrame::GetFrameForPoint(aPresContext, aPoint, aWhichLayer, aFrame);
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}
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// Only paint the selected child...
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NS_IMETHODIMP
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nsMathMLmactionFrame::Paint(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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nsFramePaintLayer aWhichLayer,
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PRUint32 aFlags)
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{
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if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
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PaintSelf(aPresContext, aRenderingContext, aDirtyRect);
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}
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nsIFrame* childFrame = GetSelectedFrame();
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if (childFrame)
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PaintChild(aPresContext, aRenderingContext, aDirtyRect, childFrame, aWhichLayer);
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#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
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// visual debug
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if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer &&
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NS_MATHML_PAINT_BOUNDING_METRICS(mPresentationData.flags)) {
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aRenderingContext.SetColor(NS_RGB(0,0,255));
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nscoord x = mReference.x + mBoundingMetrics.leftBearing;
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nscoord y = mReference.y - mBoundingMetrics.ascent;
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nscoord w = mBoundingMetrics.rightBearing - mBoundingMetrics.leftBearing;
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nscoord h = mBoundingMetrics.ascent + mBoundingMetrics.descent;
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aRenderingContext.DrawRect(x,y,w,h);
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}
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#endif
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return NS_OK;
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}
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// Only reflow the selected child ...
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NS_IMETHODIMP
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nsMathMLmactionFrame::Reflow(nsIPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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nsresult rv = NS_OK;
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aDesiredSize.width = aDesiredSize.height = 0;
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aDesiredSize.ascent = aDesiredSize.descent = 0;
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mBoundingMetrics.Clear();
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nsIFrame* childFrame = GetSelectedFrame();
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if (childFrame) {
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nsReflowReason reason = aReflowState.reason;
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if (mWasRestyled) {
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mWasRestyled = PR_FALSE;
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// If we have just been restyled, make sure to reflow our
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// selected child with a StyleChange reflow reason so that
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// it doesn't over-optimize its reflow. In principle we shouldn't
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// need to do this because we posted a style changed reflow (see
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// MouseClick() below). But that reason can be (and usually, it is)
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// changed in the reflow chain and we don't have much control other
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// than making sure that the right value is reset here.
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reason = eReflowReason_StyleChange;
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}
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nsSize availSize(aReflowState.mComputedWidth, aReflowState.mComputedHeight);
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nsHTMLReflowState childReflowState(aPresContext, aReflowState,
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childFrame, availSize, reason);
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rv = ReflowChild(childFrame, aPresContext, aDesiredSize,
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childReflowState, aStatus);
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childFrame->SetRect(nsRect(aDesiredSize.descent,aDesiredSize.ascent,
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aDesiredSize.width,aDesiredSize.height));
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mBoundingMetrics = aDesiredSize.mBoundingMetrics;
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FinalizeReflow(aPresContext, *aReflowState.rendContext, aDesiredSize);
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}
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return rv;
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}
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// Only place the selected child ...
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NS_IMETHODIMP
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nsMathMLmactionFrame::Place(nsIPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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aDesiredSize.width = aDesiredSize.height = 0;
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aDesiredSize.ascent = aDesiredSize.descent = 0;
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mBoundingMetrics.Clear();
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nsIFrame* childFrame = GetSelectedFrame();
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if (childFrame) {
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GetReflowAndBoundingMetricsFor(childFrame, aDesiredSize, mBoundingMetrics);
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if (aPlaceOrigin) {
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FinishReflowChild(childFrame, aPresContext, nsnull, aDesiredSize, 0, 0, 0);
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}
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mReference.x = 0;
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mReference.y = aDesiredSize.ascent;
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}
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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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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// helper to show a msg on the status bar
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// curled from nsObjectFrame.cpp ...
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nsresult
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nsMathMLmactionFrame::ShowStatus(nsIPresContext* aPresContext,
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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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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::MouseOver(nsIDOMEvent* aMouseEvent)
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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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nsAutoString value;
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if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttr(kNameSpaceID_None,
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nsMathMLAtoms::actiontype_, value)) {
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// expected statusline prefix (11ch)...
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if (11 < value.Length() && 0 == value.Find("statusline#")) {
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value.Cut(0, 11);
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ShowStatus(mPresContext, value);
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}
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::MouseOut(nsIDOMEvent* aMouseEvent)
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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(mPresContext, value);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMathMLmactionFrame::MouseClick(nsIDOMEvent* aMouseEvent)
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{
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nsAutoString value;
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if (NS_MATHML_ACTION_TYPE_TOGGLE == mActionType) {
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if (mChildCount > 1) {
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PRInt32 selection = (mSelection == mChildCount)? 1 : mSelection + 1;
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char cbuf[10];
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PR_snprintf(cbuf, sizeof(cbuf), "%d", selection);
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value.AssignWithConversion(cbuf);
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PRBool notify = PR_FALSE; // don't yet notify the document
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mContent->SetAttr(kNameSpaceID_None, nsMathMLAtoms::selection_, value, notify);
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// Now trigger a content-changed reflow...
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ReflowDirtyChild(mPresContext->PresShell(), mSelectedFrame);
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}
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}
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else if (NS_MATHML_ACTION_TYPE_RESTYLE == mActionType) {
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if (!mRestyle.IsEmpty()) {
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nsCOMPtr<nsIDOMElement> node( do_QueryInterface(mContent) );
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if (node.get()) {
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if (NS_CONTENT_ATTR_HAS_VALUE == mContent->GetAttr(kNameSpaceID_None,
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nsMathMLAtoms::actiontype_, value))
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node->RemoveAttribute(NS_LITERAL_STRING("actiontype"));
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else
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node->SetAttribute(NS_LITERAL_STRING("actiontype"), mRestyle);
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// At this stage, our style sub-tree has been re-resolved
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mWasRestyled = PR_TRUE;
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// Cancel the reflow command that the change of attribute has
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// caused, and post a style changed reflow request that is instead
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// targeted at our selected frame
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nsIPresShell *presShell = mPresContext->PresShell();
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presShell->CancelReflowCommand(this, nsnull);
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nsFrame::CreateAndPostReflowCommand(presShell, mSelectedFrame,
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eReflowType_StyleChanged, nsnull, nsnull, nsnull);
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}
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}
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}
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return NS_OK;
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}
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