1 files changed, 60 insertions, 0 deletions
diff --git a/layout/xul/tree/nsTreeColFrame.h b/layout/xul/tree/nsTreeColFrame.h
new file mode 100644
index 0000000000..f2525f7599
--- /dev/null
+++ b/layout/xul/tree/nsTreeColFrame.h
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "mozilla/Attributes.h"
+#include "mozilla/ComputedStyle.h"
+#include "nsBoxFrame.h"
+
+namespace mozilla {
+class PresShell;
+namespace dom {
+class XULTreeElement;
+}
+}  // namespace mozilla
+
+nsIFrame* NS_NewTreeColFrame(mozilla::PresShell* aPresShell,
+                             mozilla::ComputedStyle* aStyle);
+
+class nsTreeColFrame final : public nsBoxFrame {
+ public:
+  NS_DECL_FRAMEARENA_HELPERS(nsTreeColFrame)
+
+  explicit nsTreeColFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
+      : nsBoxFrame(aStyle, aPresContext, kClassID) {}
+
+  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
+                    nsIFrame* aPrevInFlow) override;
+
+  virtual void DestroyFrom(nsIFrame* aDestructRoot,
+                           PostDestroyData& aPostDestroyData) override;
+
+  virtual void BuildDisplayListForChildren(
+      nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) override;
+
+  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                    int32_t aModType) override;
+
+  virtual void SetXULBounds(nsBoxLayoutState& aBoxLayoutState,
+                            const nsRect& aRect,
+                            bool aRemoveOverflowArea = false) override;
+
+  friend nsIFrame* NS_NewTreeColFrame(mozilla::PresShell* aPresShell,
+                                      ComputedStyle* aStyle);
+
+ protected:
+  virtual ~nsTreeColFrame();
+
+  /**
+   * @return the tree that this column belongs to, or nullptr.
+   */
+  mozilla::dom::XULTreeElement* GetTree();
+
+  /**
+   * Helper method that gets the TreeColumns object this column belongs to
+   * and calls InvalidateColumns() on it.
+   */
+  void InvalidateColumns(bool aCanWalkFrameTree = true);
+};