The Tor Browser: accessible/src/xul/XULTreeAccessible.h@97036ab72558 (annotated)

accessible/src/xul/XULTreeAccessible.h@97036ab72558 (annotated)

accessible/src/xul/XULTreeAccessible.h

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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 mozilla_a11y_XULTreeAccessible_h__
 #define mozilla_a11y_XULTreeAccessible_h__
 #include "nsITreeBoxObject.h"
 #include "nsITreeView.h"
 #include "nsITreeColumns.h"
 #include "XULListboxAccessible.h"
 class nsTreeBodyFrame;
 namespace mozilla {
 namespace a11y {
 /*
  * A class the represents the XUL Tree widget.
  */
 const uint32_t kMaxTreeColumns = 100;
 const uint32_t kDefaultTreeCacheSize = 256;
 /**
  * Accessible class for XUL tree element.
  */
 class XULTreeAccessible : public AccessibleWrap
 {
 public:
   using Accessible::GetChildAt;
   XULTreeAccessible(nsIContent* aContent, DocAccessible* aDoc,
                     nsTreeBodyFrame* aTreeframe);
   // nsISupports and cycle collection
   NS_DECL_ISUPPORTS_INHERITED
   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeAccessible, Accessible)
   // Accessible
   virtual void Shutdown();
   virtual void Value(nsString& aValue);
   virtual a11y::role NativeRole();
   virtual uint64_t NativeState();
   virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
                                    EWhichChildAtPoint aWhichChild);
   virtual Accessible* GetChildAt(uint32_t aIndex) const MOZ_OVERRIDE;
   virtual uint32_t ChildCount() const MOZ_OVERRIDE;
   virtual Relation RelationByType(RelationType aType) MOZ_OVERRIDE;
   // SelectAccessible
   virtual already_AddRefed<nsIArray> SelectedItems();
   virtual uint32_t SelectedItemCount();
   virtual Accessible* GetSelectedItem(uint32_t aIndex);
   virtual bool IsItemSelected(uint32_t aIndex);
   virtual bool AddItemToSelection(uint32_t aIndex);
   virtual bool RemoveItemFromSelection(uint32_t aIndex);
   virtual bool SelectAll();
   virtual bool UnselectAll();
   // Widgets
   virtual bool IsWidget() const;
   virtual bool IsActiveWidget() const;
   virtual bool AreItemsOperable() const;
   virtual Accessible* CurrentItem();
   virtual void SetCurrentItem(Accessible* aItem);
   virtual Accessible* ContainerWidget() const;
   // XULTreeAccessible
   /**
    * Return tree item accessible at the givem row. If accessible doesn't exist
    * in the cache then create and cache it.
    *
    * @param aRow         [in] the given row index
    */
   Accessible* GetTreeItemAccessible(int32_t aRow) const;
   /**
    * Invalidates the number of cached treeitem accessibles.
    *
    * @param aRow    [in] row index the invalidation starts from
    * @param aCount  [in] the number of treeitem accessibles to invalidate,
    *                 the number sign specifies whether rows have been
    *                 inserted (plus) or removed (minus)
    */
   void InvalidateCache(int32_t aRow, int32_t aCount);
   /**
    * Fires name change events for invalidated area of tree.
    *
    * @param aStartRow  [in] row index invalidation starts from
    * @param aEndRow    [in] row index invalidation ends, -1 means last row index
    * @param aStartCol  [in] column index invalidation starts from
    * @param aEndCol    [in] column index invalidation ends, -1 mens last column
    *                    index
    */
   void TreeViewInvalidated(int32_t aStartRow, int32_t aEndRow,
                            int32_t aStartCol, int32_t aEndCol);
   /**
    * Invalidates children created for previous tree view.
    */
   void TreeViewChanged(nsITreeView* aView);
 protected:
   /**
    * Creates tree item accessible for the given row index.
    */
   virtual already_AddRefed<Accessible>
     CreateTreeItemAccessible(int32_t aRow) const;
   nsCOMPtr<nsITreeBoxObject> mTree;
   nsITreeView* mTreeView;
   mutable AccessibleHashtable mAccessibleCache;
 };
 /**
  * Base class for tree item accessibles.
  */
 #define XULTREEITEMBASEACCESSIBLE_IMPL_CID            \
 {  /* 1ab79ae7-766a-443c-940b-b1e6b0831dfc */         \
 x1ab79ae7,                                         \
 x766a,                                             \
 x443c,                                             \
   { 0x94, 0x0b, 0xb1, 0xe6, 0xb0, 0x83, 0x1d, 0xfc }  \
 }
 class XULTreeItemAccessibleBase : public AccessibleWrap
 {
 public:
   using Accessible::GetParent;
   XULTreeItemAccessibleBase(nsIContent* aContent, DocAccessible* aDoc,
                             Accessible* aParent, nsITreeBoxObject* aTree,
                             nsITreeView* aTreeView, int32_t aRow);
   // nsISupports and cycle collection
   NS_DECL_ISUPPORTS_INHERITED
   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeItemAccessibleBase,
                                            AccessibleWrap)
   // nsIAccessible
   NS_IMETHOD GetBounds(int32_t *aX, int32_t *aY,
                        int32_t *aWidth, int32_t *aHeight);
   NS_IMETHOD SetSelected(bool aSelect);
   NS_IMETHOD TakeFocus();
   NS_IMETHOD GetActionName(uint8_t aIndex, nsAString& aName);
   NS_IMETHOD DoAction(uint8_t aIndex);
   // Accessible
   virtual void Shutdown();
   virtual GroupPos GroupPosition();
   virtual uint64_t NativeState();
   virtual uint64_t NativeInteractiveState() const;
   virtual int32_t IndexInParent() const;
   virtual Relation RelationByType(RelationType aType) MOZ_OVERRIDE;
   virtual Accessible* FocusedChild();
   // ActionAccessible
   virtual uint8_t ActionCount();
   // Widgets
   virtual Accessible* ContainerWidget() const;
   // XULTreeItemAccessibleBase
   NS_DECLARE_STATIC_IID_ACCESSOR(XULTREEITEMBASEACCESSIBLE_IMPL_CID)
   /**
    * Return row index associated with the accessible.
    */
   int32_t GetRowIndex() const { return mRow; }
   /**
    * Return cell accessible for the given column. If XUL tree accessible is not
    * accessible table then return null.
    */
   virtual Accessible* GetCellAccessible(nsITreeColumn* aColumn) const
     { return nullptr; }
   /**
    * Proccess row invalidation. Used to fires name change events.
    */
   virtual void RowInvalidated(int32_t aStartColIdx, int32_t aEndColIdx) = 0;
 protected:
   enum { eAction_Click = 0, eAction_Expand = 1 };
   // Accessible
   virtual void DispatchClickEvent(nsIContent *aContent, uint32_t aActionIndex);
   virtual Accessible* GetSiblingAtOffset(int32_t aOffset,
                                          nsresult *aError = nullptr) const;
   // XULTreeItemAccessibleBase
   /**
    * Return true if the tree item accessible is expandable (contains subrows).
    */
   bool IsExpandable();
   /**
    * Return name for cell at the given column.
    */
   void GetCellName(nsITreeColumn* aColumn, nsAString& aName);
   nsCOMPtr<nsITreeBoxObject> mTree;
   nsITreeView* mTreeView;
   int32_t mRow;
 };
 NS_DEFINE_STATIC_IID_ACCESSOR(XULTreeItemAccessibleBase,
                               XULTREEITEMBASEACCESSIBLE_IMPL_CID)
 /**
  * Accessible class for items for XUL tree.
  */
 class XULTreeItemAccessible : public XULTreeItemAccessibleBase
 {
 public:
   XULTreeItemAccessible(nsIContent* aContent, DocAccessible* aDoc,
                         Accessible* aParent, nsITreeBoxObject* aTree,
                         nsITreeView* aTreeView, int32_t aRow);
   // nsISupports and cycle collection
   NS_DECL_ISUPPORTS_INHERITED
   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(XULTreeItemAccessible,
                                            XULTreeItemAccessibleBase)
   // Accessible
   virtual void Shutdown();
   virtual ENameValueFlag Name(nsString& aName);
   virtual a11y::role NativeRole();
   // XULTreeItemAccessibleBase
   virtual void RowInvalidated(int32_t aStartColIdx, int32_t aEndColIdx);
 protected:
   // Accessible
   virtual void CacheChildren();
   // XULTreeItemAccessible
   nsCOMPtr<nsITreeColumn> mColumn;
   nsString mCachedName;
 };
 /**
  * Accessible class for columns element of XUL tree.
  */
 class XULTreeColumAccessible : public XULColumAccessible
 {
 public:
   XULTreeColumAccessible(nsIContent* aContent, DocAccessible* aDoc);
 protected:
   // Accessible
   virtual Accessible* GetSiblingAtOffset(int32_t aOffset,
                                          nsresult *aError = nullptr) const;
 };
 ////////////////////////////////////////////////////////////////////////////////
 // Accessible downcasting method
 inline XULTreeAccessible*
 Accessible::AsXULTree()
 {
   return IsXULTree() ? static_cast<XULTreeAccessible*>(this) : nullptr;
 }
 } // namespace a11y
 } // namespace mozilla
 #endif

The Tor Browser / annotate

accessible/src/xul/XULTreeAccessible.h@97036ab72558 (annotated)

accessible/src/xul/XULTreeAccessible.h