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96 lines
3.6 KiB
C++
96 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef nsIGridPart_h___
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#define nsIGridPart_h___
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#include "nsISupports.h"
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class nsGridRowGroupLayout;
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class nsGrid;
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class nsGridRowLayout;
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class nsGridRow;
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class nsGridLayout2;
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// 07373ed7-e947-4a5e-b36c-69f7c195677b
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#define NS_IGRIDPART_IID \
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{ 0x07373ed7, 0xe947, 0x4a5e, \
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{ 0xb3, 0x6c, 0x69, 0xf7, 0xc1, 0x95, 0x67, 0x7b } }
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/**
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* An additional interface implemented by nsBoxLayout implementations
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* for parts of a grid (excluding cells, which are not special).
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*/
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class nsIGridPart : public nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IGRIDPART_IID)
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virtual nsGridRowGroupLayout* CastToRowGroupLayout()=0;
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virtual nsGridLayout2* CastToGridLayout()=0;
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/**
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* @param aBox [IN] The other half of the |this| parameter, i.e., the box
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* whose layout manager is |this|.
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* @param aIndex [INOUT] For callers not setting aRequestor, the value
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* pointed to by aIndex is incremented by the index
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* of the row (aBox) within its row group; if aBox
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* is not a row/column, it is untouched.
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* The implementation does this by doing the aIndex
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* incrementing in the call to the parent row group
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* when aRequestor is non-null.
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* @param aRequestor [IN] Non-null if and only if this is a recursive
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* call from the GetGrid method on a child grid part,
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* in which case it is a pointer to that grid part.
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* (This may only be non-null for row groups and
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* grids.)
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* @return The grid of which aBox (a row, row group, or grid) is a part.
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*/
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virtual nsGrid* GetGrid(nsIFrame* aBox, int32_t* aIndex, nsGridRowLayout* aRequestor=nullptr)=0;
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/**
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* @param aBox [IN] The other half of the |this| parameter, i.e., the box
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* whose layout manager is |this|.
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* @param aParentBox [OUT] The box representing the next level up in
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* the grid (i.e., row group for a row, grid for a
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* row group).
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* @returns The layout manager for aParentBox.
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*/
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virtual nsIGridPart* GetParentGridPart(nsIFrame* aBox, nsIFrame** aParentBox) = 0;
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/**
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* @param aBox [IN] The other half of the |this| parameter, i.e., the box
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* whose layout manager is |this|.
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* @param aRowCount [INOUT] Row count
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* @param aComputedColumnCount [INOUT] Column count
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*/
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virtual void CountRowsColumns(nsIFrame* aBox, int32_t& aRowCount, int32_t& aComputedColumnCount)=0;
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virtual void DirtyRows(nsIFrame* aBox, nsBoxLayoutState& aState)=0;
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virtual int32_t BuildRows(nsIFrame* aBox, nsGridRow* aRows)=0;
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virtual nsMargin GetTotalMargin(nsIFrame* aBox, bool aIsHorizontal)=0;
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virtual int32_t GetRowCount() { return 1; }
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/**
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* Return the level of the grid hierarchy this grid part represents.
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*/
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enum Type { eGrid, eRowGroup, eRowLeaf };
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virtual Type GetType()=0;
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/**
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* Return whether this grid part is an appropriate parent for the argument.
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*/
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bool CanContain(nsIGridPart* aPossibleChild) {
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Type thisType = GetType(), childType = aPossibleChild->GetType();
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return thisType + 1 == childType || (thisType == eRowGroup && childType == eRowGroup);
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}
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIGridPart, NS_IGRIDPART_IID)
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#endif
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