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