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comparison: layout/generic/nsFontInflationData.h
layout/generic/nsFontInflationData.h
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| 1 /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* Per-block-formatting-context manager of font size inflation for pan and zoom UI. */ | |
| 7 | |
| 8 #ifndef nsFontInflationData_h_ | |
| 9 #define nsFontInflationData_h_ | |
| 10 | |
| 11 #include "nsIFrame.h" | |
| 12 | |
| 13 struct nsHTMLReflowState; | |
| 14 | |
| 15 class nsFontInflationData | |
| 16 { | |
| 17 public: | |
| 18 | |
| 19 static nsFontInflationData* FindFontInflationDataFor(const nsIFrame *aFrame); | |
| 20 | |
| 21 // Returns whether the effective width changed (which requires the | |
| 22 // caller to mark its descendants dirty | |
| 23 static bool | |
| 24 UpdateFontInflationDataWidthFor(const nsHTMLReflowState& aReflowState); | |
| 25 | |
| 26 static void MarkFontInflationDataTextDirty(nsIFrame *aFrame); | |
| 27 | |
| 28 bool InflationEnabled() { | |
| 29 if (mTextDirty) { | |
| 30 ScanText(); | |
| 31 } | |
| 32 return mInflationEnabled; | |
| 33 } | |
| 34 | |
| 35 nscoord EffectiveWidth() const { | |
| 36 return mNCAWidth; | |
| 37 } | |
| 38 | |
| 39 private: | |
| 40 | |
| 41 nsFontInflationData(nsIFrame* aBFCFrame); | |
| 42 | |
| 43 nsFontInflationData(const nsFontInflationData&) MOZ_DELETE; | |
| 44 void operator=(const nsFontInflationData&) MOZ_DELETE; | |
| 45 | |
| 46 void UpdateWidth(const nsHTMLReflowState &aReflowState); | |
| 47 enum SearchDirection { eFromStart, eFromEnd }; | |
| 48 static nsIFrame* FindEdgeInflatableFrameIn(nsIFrame *aFrame, | |
| 49 SearchDirection aDirection); | |
| 50 | |
| 51 void MarkTextDirty() { mTextDirty = true; } | |
| 52 void ScanText(); | |
| 53 // Scan text in the subtree rooted at aFrame. Increment mTextAmount | |
| 54 // by multiplying the number of characters found by the font size | |
| 55 // (yielding the width that would be occupied by the characters if | |
| 56 // they were all em squares). But stop scanning if mTextAmount | |
| 57 // crosses mTextThreshold. | |
| 58 void ScanTextIn(nsIFrame *aFrame); | |
| 59 | |
| 60 static const nsIFrame* FlowRootFor(const nsIFrame *aFrame) | |
| 61 { | |
| 62 while (!(aFrame->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT)) { | |
| 63 aFrame = aFrame->GetParent(); | |
| 64 } | |
| 65 return aFrame; | |
| 66 } | |
| 67 | |
| 68 nsIFrame *mBFCFrame; | |
| 69 nscoord mNCAWidth; | |
| 70 nscoord mTextAmount, mTextThreshold; | |
| 71 bool mInflationEnabled; // for this BFC | |
| 72 bool mTextDirty; | |
| 73 }; | |
| 74 | |
| 75 #endif /* !defined(nsFontInflationData_h_) */ |
