1 files changed, 214 insertions, 0 deletions
diff --git a/layout/xul/tree/nsTreeColumns.h b/layout/xul/tree/nsTreeColumns.h
new file mode 100644
index 0000000000..677206a89d
--- /dev/null
+++ b/layout/xul/tree/nsTreeColumns.h
@@ -0,0 +1,214 @@
+/* -*- 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/. */
+
+#ifndef nsTreeColumns_h__
+#define nsTreeColumns_h__
+
+#include "mozilla/Attributes.h"
+#include "mozilla/RefPtr.h"
+#include "nsCoord.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsQueryObject.h"
+#include "nsWrapperCache.h"
+#include "nsString.h"
+
+class nsAtom;
+class nsTreeBodyFrame;
+class nsTreeColumns;
+class nsIFrame;
+class nsIContent;
+struct nsRect;
+
+namespace mozilla {
+enum class StyleTextAlignKeyword : uint8_t;
+using StyleTextAlign = StyleTextAlignKeyword;
+class ErrorResult;
+namespace dom {
+class Element;
+class XULTreeElement;
+}  // namespace dom
+}  // namespace mozilla
+
+#define NS_TREECOLUMN_IMPL_CID                       \
+  { /* 02cd1963-4b5d-4a6c-9223-814d3ade93a3 */       \
+    0x02cd1963, 0x4b5d, 0x4a6c, {                    \
+      0x92, 0x23, 0x81, 0x4d, 0x3a, 0xde, 0x93, 0xa3 \
+    }                                                \
+  }
+
+// This class is our column info.  We use it to iterate our columns and to
+// obtain information about each column.
+class nsTreeColumn final : public nsISupports, public nsWrapperCache {
+ public:
+  nsTreeColumn(nsTreeColumns* aColumns, mozilla::dom::Element* aElement);
+
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_TREECOLUMN_IMPL_CID)
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(nsTreeColumn)
+
+  // WebIDL
+  nsIContent* GetParentObject() const;
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  mozilla::dom::Element* Element();
+
+  nsTreeColumns* GetColumns() const { return mColumns; }
+
+  int32_t GetX(mozilla::ErrorResult& aRv);
+  int32_t GetWidth(mozilla::ErrorResult& aRv);
+
+  void GetId(nsAString& aId) const;
+  int32_t Index() const { return mIndex; }
+
+  bool Primary() const { return mIsPrimary; }
+  bool Cycler() const { return mIsCycler; }
+  bool Editable() const { return mIsEditable; }
+  int16_t Type() const { return mType; }
+
+  nsTreeColumn* GetNext() const { return mNext; }
+  nsTreeColumn* GetPrevious() const { return mPrevious; }
+
+  already_AddRefed<nsTreeColumn> GetPreviousColumn();
+
+  void Invalidate(mozilla::ErrorResult& aRv);
+
+  friend class nsTreeBodyFrame;
+  friend class nsTreeColumns;
+
+ protected:
+  ~nsTreeColumn();
+  nsIFrame* GetFrame();
+  nsIFrame* GetFrame(nsTreeBodyFrame* aBodyFrame);
+  // Don't call this if GetWidthInTwips or GetRect fails
+  bool IsLastVisible(nsTreeBodyFrame* aBodyFrame);
+
+  /**
+   * Returns a rect with x and width taken from the frame's rect and specified
+   * y and height. May fail in case there's no frame for the column.
+   */
+  nsresult GetRect(nsTreeBodyFrame* aBodyFrame, nscoord aY, nscoord aHeight,
+                   nsRect* aResult);
+
+  nsresult GetXInTwips(nsTreeBodyFrame* aBodyFrame, nscoord* aResult);
+  nsresult GetWidthInTwips(nsTreeBodyFrame* aBodyFrame, nscoord* aResult);
+
+  void SetColumns(nsTreeColumns* aColumns) { mColumns = aColumns; }
+
+ public:
+  const nsAString& GetId() const { return mId; }
+  nsAtom* GetAtom() { return mAtom; }
+  int32_t GetIndex() { return mIndex; }
+
+ protected:
+  bool IsPrimary() { return mIsPrimary; }
+  bool IsCycler() { return mIsCycler; }
+  bool IsEditable() { return mIsEditable; }
+  bool Overflow() { return mOverflow; }
+
+  int16_t GetType() { return mType; }
+
+  int8_t GetCropStyle() { return mCropStyle; }
+  mozilla::StyleTextAlign GetTextAlignment() { return mTextAlignment; }
+
+  void SetNext(nsTreeColumn* aNext) {
+    NS_ASSERTION(!mNext, "already have a next sibling");
+    mNext = aNext;
+  }
+  void SetPrevious(nsTreeColumn* aPrevious) { mPrevious = aPrevious; }
+
+ private:
+  /**
+   * Non-null nsIContent for the associated <treecol> element.
+   */
+  RefPtr<mozilla::dom::Element> mContent;
+
+  nsTreeColumns* mColumns;
+
+  nsString mId;
+  RefPtr<nsAtom> mAtom;
+
+  int32_t mIndex;
+
+  bool mIsPrimary;
+  bool mIsCycler;
+  bool mIsEditable;
+  bool mOverflow;
+
+  int16_t mType;
+
+  int8_t mCropStyle;
+  mozilla::StyleTextAlign mTextAlignment;
+
+  RefPtr<nsTreeColumn> mNext;
+  nsTreeColumn* mPrevious;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsTreeColumn, NS_TREECOLUMN_IMPL_CID)
+
+class nsTreeColumns final : public nsISupports, public nsWrapperCache {
+ private:
+  ~nsTreeColumns();
+
+ public:
+  explicit nsTreeColumns(nsTreeBodyFrame* aTree);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(nsTreeColumns)
+
+  nsIContent* GetParentObject() const;
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  // WebIDL
+  mozilla::dom::XULTreeElement* GetTree() const;
+  uint32_t Count();
+  uint32_t Length() { return Count(); }
+
+  nsTreeColumn* GetFirstColumn() {
+    EnsureColumns();
+    return mFirstColumn;
+  }
+  nsTreeColumn* GetLastColumn();
+
+  nsTreeColumn* GetPrimaryColumn();
+  nsTreeColumn* GetSortedColumn();
+  nsTreeColumn* GetKeyColumn();
+
+  nsTreeColumn* GetColumnFor(mozilla::dom::Element* aElement);
+
+  nsTreeColumn* IndexedGetter(uint32_t aIndex, bool& aFound);
+  nsTreeColumn* GetColumnAt(uint32_t aIndex);
+  nsTreeColumn* NamedGetter(const nsAString& aId, bool& aFound);
+  nsTreeColumn* GetNamedColumn(const nsAString& aId);
+  void GetSupportedNames(nsTArray<nsString>& aNames);
+
+  void InvalidateColumns();
+
+  friend class nsTreeBodyFrame;
+
+ protected:
+  void SetTree(nsTreeBodyFrame* aTree) { mTree = aTree; }
+
+  // Builds our cache of column info.
+  void EnsureColumns();
+
+ private:
+  nsTreeBodyFrame* mTree;
+
+  /**
+   * The first column in the list of columns. All of the columns are supposed
+   * to be "alive", i.e. have a frame. This is achieved by clearing the columns
+   * list each time a treecol changes size.
+   *
+   * XXX this means that new nsTreeColumn objects are unnecessarily created
+   *     for untouched columns.
+   */
+  RefPtr<nsTreeColumn> mFirstColumn;
+};
+
+#endif  // nsTreeColumns_h__