зеркало из https://github.com/mozilla/pjs.git
103 строки
3.6 KiB
C++
103 строки
3.6 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* ***** 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 the font size inflation manager.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2012
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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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/* Per-block-formatting-context manager of font size inflation for pan and zoom UI. */
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#ifndef nsFontInflationData_h_
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#define nsFontInflationData_h_
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#include "nsIFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsBlockFrame.h"
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struct nsHTMLReflowState;
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class nsFontInflationData
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{
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public:
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static nsFontInflationData* FindFontInflationDataFor(const nsIFrame *aFrame);
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static void
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UpdateFontInflationDataWidthFor(const nsHTMLReflowState& aReflowState);
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static void MarkFontInflationDataTextDirty(nsIFrame *aFrame);
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bool InflationEnabled() {
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if (mTextDirty) {
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ScanText();
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}
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return mInflationEnabled;
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}
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private:
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nsFontInflationData(nsIFrame* aBFCFrame);
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nsFontInflationData(const nsFontInflationData&) MOZ_DELETE;
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void operator=(const nsFontInflationData&) MOZ_DELETE;
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void UpdateWidth(const nsHTMLReflowState &aReflowState);
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enum SearchDirection { eFromStart, eFromEnd };
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static nsIFrame* FindEdgeInflatableFrameIn(nsIFrame *aFrame,
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SearchDirection aDirection);
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void MarkTextDirty() { mTextDirty = true; }
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void ScanText();
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// Scan text in the subtree rooted at aFrame. Increment mTextAmount
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// by multiplying the number of characters found by the font size
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// (yielding the width that would be occupied by the characters if
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// they were all em squares). But stop scanning if mTextAmount
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// crosses mTextThreshold.
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void ScanTextIn(nsIFrame *aFrame);
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static const nsIFrame* FlowRootFor(const nsIFrame *aFrame)
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{
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while (!(aFrame->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT)) {
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aFrame = aFrame->GetParent();
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}
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return aFrame;
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}
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nsIFrame *mBFCFrame;
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nscoord mTextAmount, mTextThreshold;
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bool mInflationEnabled; // for this BFC
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bool mTextDirty;
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};
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#endif /* !defined(nsFontInflationData_h_) */
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