gecko-dev/layout/tables/BasicTableLayoutStrategy.h

82 lines
3.4 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:cindent:ts=4:et:sw=4:
/* 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/. */
/*
* Web-compatible algorithms that determine column and table widths,
* used for CSS2's 'table-layout: auto'.
*/
#ifndef BasicTableLayoutStrategy_h_
#define BasicTableLayoutStrategy_h_
#include "mozilla/Attributes.h"
#include "nsITableLayoutStrategy.h"
class nsTableFrame;
class BasicTableLayoutStrategy : public nsITableLayoutStrategy
{
public:
BasicTableLayoutStrategy(nsTableFrame *aTableFrame);
virtual ~BasicTableLayoutStrategy();
// nsITableLayoutStrategy implementation
virtual nscoord GetMinWidth(nsRenderingContext* aRenderingContext) MOZ_OVERRIDE;
virtual nscoord GetPrefWidth(nsRenderingContext* aRenderingContext,
bool aComputingSize) MOZ_OVERRIDE;
virtual void MarkIntrinsicWidthsDirty() MOZ_OVERRIDE;
virtual void ComputeColumnWidths(const nsHTMLReflowState& aReflowState) MOZ_OVERRIDE;
private:
// NOTE: Using prefix "BTLS" to avoid overlapping names with
// the values of nsLayoutUtils::IntrinsicWidthType
enum BtlsWidthType { BTLS_MIN_WIDTH,
BTLS_PREF_WIDTH,
BTLS_FINAL_WIDTH };
// Compute intrinsic width member variables on the columns.
void ComputeColumnIntrinsicWidths(nsRenderingContext* aRenderingContext);
// Distribute a colspanning cell's percent width (if any) to its columns.
void DistributePctWidthToColumns(float aSpanPrefPct,
int32_t aFirstCol,
int32_t aColCount);
// Distribute a width of some BltsWidthType type to a set of columns.
// aWidth: The amount of width to be distributed
// aFirstCol: The index (in the table) of the first column to be
// considered for receiving width
// aColCount: The number of consecutive columns (starting with aFirstCol)
// to be considered for receiving width
// aWidthType: The type of width being distributed. (BTLS_MIN_WIDTH and
// BTLS_PREF_WIDTH are intended to be used for dividing up
// colspan's min & pref width. BTLS_FINAL_WIDTH is intended
// to be used for distributing the table's final width across
// all its columns)
// aSpanHasSpecifiedWidth: Should be true iff:
// - We're distributing a colspanning cell's
// pref or min width to its columns
// - The colspanning cell has a specified width.
void DistributeWidthToColumns(nscoord aWidth,
int32_t aFirstCol,
int32_t aColCount,
BtlsWidthType aWidthType,
bool aSpanHasSpecifiedWidth);
// Compute the min and pref widths of the table from the width
// variables on the columns.
void ComputeIntrinsicWidths(nsRenderingContext* aRenderingContext);
nsTableFrame *mTableFrame;
nscoord mMinWidth;
nscoord mPrefWidth;
nscoord mPrefWidthPctExpand;
nscoord mLastCalcWidth;
};
#endif /* !defined(BasicTableLayoutStrategy_h_) */