gecko-dev/layout/generic/nsFlexContainerFrame.h

149 строки
6.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code is subject to the terms of the Mozilla Public License
* version 2.0 (the "License"). You can obtain a copy of the License at
* http://mozilla.org/MPL/2.0/. */
/* rendering object for CSS "display: flex" */
#ifndef nsFlexContainerFrame_h___
#define nsFlexContainerFrame_h___
#include "nsContainerFrame.h"
nsIFrame* NS_NewFlexContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext);
typedef nsContainerFrame nsFlexContainerFrameSuper;
template <class T> class nsTArray;
class nsFlexContainerFrame : public nsFlexContainerFrameSuper {
NS_DECL_FRAMEARENA_HELPERS
NS_DECL_QUERYFRAME_TARGET(nsFlexContainerFrame)
NS_DECL_QUERYFRAME
// Factory method:
friend nsIFrame* NS_NewFlexContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext);
public:
// Forward-decls of helper classes
class FlexItem;
class FlexLine;
class FlexboxAxisTracker;
class StrutInfo;
// nsIFrame overrides
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) MOZ_OVERRIDE;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus) MOZ_OVERRIDE;
virtual nscoord
GetMinWidth(nsRenderingContext* aRenderingContext) MOZ_OVERRIDE;
virtual nscoord
GetPrefWidth(nsRenderingContext* aRenderingContext) MOZ_OVERRIDE;
virtual nsIAtom* GetType() const MOZ_OVERRIDE;
#ifdef DEBUG_FRAME_DUMP
NS_IMETHOD GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
#endif
// Flexbox-specific public methods
bool IsHorizontal();
protected:
// Protected constructor & destructor
nsFlexContainerFrame(nsStyleContext* aContext) :
nsFlexContainerFrameSuper(aContext),
mChildrenHaveBeenReordered(false)
{}
virtual ~nsFlexContainerFrame();
/*
* This method does the bulk of the flex layout, implementing the algorithm
* described at:
* http://dev.w3.org/csswg/css-flexbox/#layout-algorithm
* (with a few initialization pieces happening in the caller, Reflow().
*
* Since this is a helper for Reflow(), this takes all the same parameters
* as Reflow(), plus a few more parameters that Reflow() sets up for us.
*
* (The logic behind the division of work between Reflow and DoFlexLayout is
* as follows: DoFlexLayout() begins at the step that we have to jump back
* to, if we find any visibility:collapse children, and Reflow() does
* everything before that point.)
*/
nsresult DoFlexLayout(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus,
nscoord aContentBoxMainSize,
nscoord aAvailableHeightForContent,
nsTArray<StrutInfo>& aStruts,
const FlexboxAxisTracker& aAxisTracker);
/**
* Checks whether our child-frame list "mFrames" is sorted, using the given
* IsLessThanOrEqual function, and sorts it if it's not already sorted.
*
* XXXdholbert Once we support pagination, we need to make this function
* check our continuations as well (or wrap it in a function that does).
*
* @return true if we had to sort mFrames, false if it was already sorted.
*/
template<bool IsLessThanOrEqual(nsIFrame*, nsIFrame*)>
bool SortChildrenIfNeeded();
// Protected flex-container-specific methods / member-vars
#ifdef DEBUG
void SanityCheckAnonymousFlexItems() const;
#endif // DEBUG
FlexItem GenerateFlexItemForChild(nsPresContext* aPresContext,
nsIFrame* aChildFrame,
const nsHTMLReflowState& aParentReflowState,
const FlexboxAxisTracker& aAxisTracker);
// Returns nsresult because we might have to reflow aFlexItem.Frame() (to
// get its vertical intrinsic size in a vertical flexbox), and if that
// reflow fails (returns a failure nsresult), we want to bail out.
nsresult ResolveFlexItemMaxContentSizing(nsPresContext* aPresContext,
FlexItem& aFlexItem,
const nsHTMLReflowState& aParentReflowState,
const FlexboxAxisTracker& aAxisTracker);
nsresult GenerateFlexLines(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nscoord aContentBoxMainSize,
nscoord aAvailableHeightForContent,
const nsTArray<StrutInfo>& aStruts,
const FlexboxAxisTracker& aAxisTracker,
nsTArray<FlexLine>& aLines);
nscoord GetMainSizeFromReflowState(const nsHTMLReflowState& aReflowState,
const FlexboxAxisTracker& aAxisTracker);
nscoord ComputeCrossSize(const nsHTMLReflowState& aReflowState,
const FlexboxAxisTracker& aAxisTracker,
const nsTArray<FlexLine>& aLines,
nscoord aAvailableHeightForContent,
bool* aIsDefinite,
nsReflowStatus& aStatus);
nsresult SizeItemInCrossAxis(nsPresContext* aPresContext,
const FlexboxAxisTracker& aAxisTracker,
nsHTMLReflowState& aChildReflowState,
FlexItem& aItem);
bool mChildrenHaveBeenReordered; // Have we ever had to reorder our kids
// to satisfy their 'order' values?
};
#endif /* nsFlexContainerFrame_h___ */