75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* Per-block-formatting-context manager of font size inflation for pan and zoom UI. */
|
|
|
|
#ifndef nsFontInflationData_h_
|
|
#define nsFontInflationData_h_
|
|
|
|
#include "nsContainerFrame.h"
|
|
|
|
class nsFontInflationData
|
|
{
|
|
using ReflowInput = mozilla::ReflowInput;
|
|
|
|
public:
|
|
|
|
static nsFontInflationData* FindFontInflationDataFor(const nsIFrame *aFrame);
|
|
|
|
// Returns whether the effective width changed (which requires the
|
|
// caller to mark its descendants dirty
|
|
static bool
|
|
UpdateFontInflationDataISizeFor(const ReflowInput& aReflowInput);
|
|
|
|
static void MarkFontInflationDataTextDirty(nsIFrame *aFrame);
|
|
|
|
bool InflationEnabled() {
|
|
if (mTextDirty) {
|
|
ScanText();
|
|
}
|
|
return mInflationEnabled;
|
|
}
|
|
|
|
nscoord EffectiveISize() const {
|
|
return mNCAISize;
|
|
}
|
|
|
|
private:
|
|
|
|
explicit nsFontInflationData(nsIFrame* aBFCFrame);
|
|
|
|
nsFontInflationData(const nsFontInflationData&) = delete;
|
|
void operator=(const nsFontInflationData&) = delete;
|
|
|
|
void UpdateISize(const ReflowInput &aReflowInput);
|
|
enum SearchDirection { eFromStart, eFromEnd };
|
|
static nsIFrame* FindEdgeInflatableFrameIn(nsIFrame *aFrame,
|
|
SearchDirection aDirection);
|
|
|
|
void MarkTextDirty() { mTextDirty = true; }
|
|
void ScanText();
|
|
// Scan text in the subtree rooted at aFrame. Increment mTextAmount
|
|
// by multiplying the number of characters found by the font size
|
|
// (yielding the inline-size that would be occupied by the characters if
|
|
// they were all em squares). But stop scanning if mTextAmount
|
|
// crosses mTextThreshold.
|
|
void ScanTextIn(nsIFrame *aFrame);
|
|
|
|
static const nsIFrame* FlowRootFor(const nsIFrame *aFrame)
|
|
{
|
|
while (!(aFrame->GetStateBits() & NS_FRAME_FONT_INFLATION_FLOW_ROOT)) {
|
|
aFrame = aFrame->GetParent();
|
|
}
|
|
return aFrame;
|
|
}
|
|
|
|
nsIFrame *mBFCFrame;
|
|
nscoord mNCAISize;
|
|
nscoord mTextAmount, mTextThreshold;
|
|
bool mInflationEnabled; // for this BFC
|
|
bool mTextDirty;
|
|
};
|
|
|
|
#endif /* !defined(nsFontInflationData_h_) */
|