зеркало из https://github.com/mozilla/gecko-dev.git
78 строки
2.3 KiB
C++
78 строки
2.3 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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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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/* 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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// Returns whether the effective width changed (which requires the
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// caller to mark its descendants dirty
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static bool
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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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nscoord EffectiveWidth() const {
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return mNCAWidth;
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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 mNCAWidth;
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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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