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tenfourfox/accessible/xul/XULTreeAccessible.h

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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 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 {
class XULTreeGridCellAccessible;
/*
* A class the represents the XUL Tree widget.
*/
const uint32_t kMaxTreeColumns = 100;
const uint32_t kDefaultTreeCacheLength = 128;
/**
* Accessible class for XUL tree element.
*/
class XULTreeAccessible : public AccessibleWrap
{
public:
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() override;
virtual void Value(nsString& aValue) override;
virtual a11y::role NativeRole() override;
virtual uint64_t NativeState() override;
virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
EWhichChildAtPoint aWhichChild) override;
virtual Accessible* GetChildAt(uint32_t aIndex) const override;
virtual uint32_t ChildCount() const override;
virtual Relation RelationByType(RelationType aType) override;
// SelectAccessible
virtual void SelectedItems(nsTArray<Accessible*>* aItems) override;
virtual uint32_t SelectedItemCount() override;
virtual Accessible* GetSelectedItem(uint32_t aIndex) override;
virtual bool IsItemSelected(uint32_t aIndex) override;
virtual bool AddItemToSelection(uint32_t aIndex) override;
virtual bool RemoveItemFromSelection(uint32_t aIndex) override;
virtual bool SelectAll() override;
virtual bool UnselectAll() override;
// Widgets
virtual bool IsWidget() const override;
virtual bool IsActiveWidget() const override;
virtual bool AreItemsOperable() const override;
virtual Accessible* CurrentItem() override;
virtual void SetCurrentItem(Accessible* aItem) override;
virtual Accessible* ContainerWidget() const override;
// 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:
virtual ~XULTreeAccessible();
/**
* 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 */ \
0x1ab79ae7, \
0x766a, \
0x443c, \
{ 0x94, 0x0b, 0xb1, 0xe6, 0xb0, 0x83, 0x1d, 0xfc } \
}
class XULTreeItemAccessibleBase : public AccessibleWrap
{
public:
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)
// Accessible
virtual void Shutdown() override;
virtual nsIntRect Bounds() const override;
virtual GroupPos GroupPosition() override;
virtual uint64_t NativeState() override;
virtual uint64_t NativeInteractiveState() const override;
virtual int32_t IndexInParent() const override;
virtual Relation RelationByType(RelationType aType) override;
virtual Accessible* FocusedChild() override;
virtual void SetSelected(bool aSelect) override;
virtual void TakeFocus() override;
// ActionAccessible
virtual uint8_t ActionCount() override;
virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
virtual bool DoAction(uint8_t aIndex) override;
// Widgets
virtual Accessible* ContainerWidget() const override;
// 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 XULTreeGridCellAccessible* 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:
virtual ~XULTreeItemAccessibleBase();
enum { eAction_Click = 0, eAction_Expand = 1 };
// Accessible
virtual void DispatchClickEvent(nsIContent *aContent, uint32_t aActionIndex) override;
virtual Accessible* GetSiblingAtOffset(int32_t aOffset,
nsresult *aError = nullptr) const override;
// 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() override;
virtual ENameValueFlag Name(nsString& aName) override;
virtual a11y::role NativeRole() override;
// XULTreeItemAccessibleBase
virtual void RowInvalidated(int32_t aStartColIdx, int32_t aEndColIdx) override;
protected:
virtual ~XULTreeItemAccessible();
// Accessible
virtual void CacheChildren() override;
// 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
override;
};
////////////////////////////////////////////////////////////////////////////////
// Accessible downcasting method
inline XULTreeAccessible*
Accessible::AsXULTree()
{
return IsXULTree() ? static_cast<XULTreeAccessible*>(this) : nullptr;
}
} // namespace a11y
} // namespace mozilla
#endif
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