mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-14 15:37:55 +00:00
95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
// vim:cindent:ts=2:et:sw=2:
|
|
/* 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/. */
|
|
|
|
/* class that a parent frame uses to reflow a block frame */
|
|
|
|
#ifndef nsBlockReflowContext_h___
|
|
#define nsBlockReflowContext_h___
|
|
|
|
#include "nsIFrame.h"
|
|
#include "nsHTMLReflowMetrics.h"
|
|
|
|
class nsBlockFrame;
|
|
class nsBlockReflowState;
|
|
struct nsHTMLReflowState;
|
|
class nsLineBox;
|
|
class nsIFrame;
|
|
class nsPresContext;
|
|
class nsLineLayout;
|
|
struct nsStylePosition;
|
|
struct nsBlockHorizontalAlign;
|
|
|
|
/**
|
|
* An encapsulation of the state and algorithm for reflowing block frames.
|
|
*/
|
|
class nsBlockReflowContext {
|
|
public:
|
|
nsBlockReflowContext(nsPresContext* aPresContext,
|
|
const nsHTMLReflowState& aParentRS);
|
|
~nsBlockReflowContext() { }
|
|
|
|
nsresult ReflowBlock(const nsRect& aSpace,
|
|
bool aApplyTopMargin,
|
|
nsCollapsingMargin& aPrevMargin,
|
|
nscoord aClearance,
|
|
bool aIsAdjacentWithTop,
|
|
nsLineBox* aLine,
|
|
nsHTMLReflowState& aReflowState,
|
|
nsReflowStatus& aReflowStatus,
|
|
nsBlockReflowState& aState);
|
|
|
|
bool PlaceBlock(const nsHTMLReflowState& aReflowState,
|
|
bool aForceFit,
|
|
nsLineBox* aLine,
|
|
nsCollapsingMargin& aBottomMarginResult /* out */,
|
|
nsRect& aInFlowBounds,
|
|
nsOverflowAreas& aOverflowAreas,
|
|
nsReflowStatus aReflowStatus);
|
|
|
|
nsCollapsingMargin& GetCarriedOutBottomMargin() {
|
|
return mMetrics.mCarriedOutBottomMargin;
|
|
}
|
|
|
|
nscoord GetTopMargin() const {
|
|
return mTopMargin.get();
|
|
}
|
|
|
|
const nsHTMLReflowMetrics& GetMetrics() const {
|
|
return mMetrics;
|
|
}
|
|
|
|
/**
|
|
* Computes the collapsed top margin for a block whose reflow state is in aRS.
|
|
* The computed margin is added into aMargin.
|
|
* If aClearanceFrame is null then this is the first optimistic pass which shall assume
|
|
* that no frames have clearance, and we clear the HasClearance on all frames encountered.
|
|
* If non-null, this is the second pass and
|
|
* the caller has decided aClearanceFrame needs clearance (and we will
|
|
* therefore stop collapsing there); also, this function is responsible for marking
|
|
* it with SetHasClearance.
|
|
* If in the optimistic pass any frame is encountered that might possibly need
|
|
* clearance (i.e., if we really needed the optimism assumption) then we set aMayNeedRetry
|
|
* to true.
|
|
* We return true if we changed the clearance state of any line and marked it dirty.
|
|
*/
|
|
static bool ComputeCollapsedTopMargin(const nsHTMLReflowState& aRS,
|
|
nsCollapsingMargin* aMargin, nsIFrame* aClearanceFrame,
|
|
bool* aMayNeedRetry, bool* aIsEmpty = nullptr);
|
|
|
|
protected:
|
|
nsPresContext* mPresContext;
|
|
const nsHTMLReflowState& mOuterReflowState;
|
|
|
|
nsIFrame* mFrame;
|
|
nsRect mSpace;
|
|
|
|
nscoord mX, mY;
|
|
nsHTMLReflowMetrics mMetrics;
|
|
nsCollapsingMargin mTopMargin;
|
|
};
|
|
|
|
#endif /* nsBlockReflowContext_h___ */
|