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71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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
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* UI. */
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#ifndef nsFontInflationData_h_
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#define nsFontInflationData_h_
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#include "nsContainerFrame.h"
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class nsFontInflationData {
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using ReflowInput = mozilla::ReflowInput;
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public:
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static nsFontInflationData* FindFontInflationDataFor(const nsIFrame* aFrame);
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// Returns whether the usable width changed (which requires the
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// caller to mark its descendants dirty)
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static bool UpdateFontInflationDataISizeFor(const ReflowInput& aReflowInput);
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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 UsableISize() const { return mUsableISize; }
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private:
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explicit nsFontInflationData(nsIFrame* aBFCFrame);
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nsFontInflationData(const nsFontInflationData&) = delete;
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void operator=(const nsFontInflationData&) = delete;
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void UpdateISize(const ReflowInput& aReflowInput);
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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 inline-size 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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while (!aFrame->HasAnyStateBits(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 mUsableISize;
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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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