1 files changed, 95 insertions, 0 deletions
diff --git a/layout/xul/grid/nsIGridPart.h b/layout/xul/grid/nsIGridPart.h
new file mode 100644
index 000000000..202429de6
--- /dev/null
+++ b/layout/xul/grid/nsIGridPart.h
@@ -0,0 +1,95 @@
+/* -*- 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
+