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Side by Side Diff: ui/views/view.h

Issue 2119413004: a11y: Exclude children of nested keyboard accessible controls from a11y tree. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Before revert of cross-platform ignored a11y elements. Created 4 years, 1 month ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef UI_VIEWS_VIEW_H_ 5 #ifndef UI_VIEWS_VIEW_H_
6 #define UI_VIEWS_VIEW_H_ 6 #define UI_VIEWS_VIEW_H_
7 7
8 #include <stddef.h> 8 #include <stddef.h>
9 9
10 #include <algorithm> 10 #include <algorithm>
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772 // Returns the view that should be selected next when pressing Shift-Tab. 772 // Returns the view that should be selected next when pressing Shift-Tab.
773 View* GetPreviousFocusableView(); 773 View* GetPreviousFocusableView();
774 774
775 // Sets the component that should be selected next when pressing Tab, and 775 // Sets the component that should be selected next when pressing Tab, and
776 // makes the current view the precedent view of the specified one. 776 // makes the current view the precedent view of the specified one.
777 // Note that by default views are linked in the order they have been added to 777 // Note that by default views are linked in the order they have been added to
778 // their container. Use this method if you want to modify the order. 778 // their container. Use this method if you want to modify the order.
779 // IMPORTANT NOTE: loops in the focus hierarchy are not supported. 779 // IMPORTANT NOTE: loops in the focus hierarchy are not supported.
780 void SetNextFocusableView(View* view); 780 void SetNextFocusableView(View* view);
781 781
782 // Returns last set focus behavior.
783 FocusBehavior focus_behavior() const { return focus_behavior_; }
782 // Sets |focus_behavior| and advances focus if necessary. 784 // Sets |focus_behavior| and advances focus if necessary.
783 void SetFocusBehavior(FocusBehavior focus_behavior); 785 void SetFocusBehavior(FocusBehavior focus_behavior);
784 786
785 // Returns true if this view is focusable, |enabled_| and drawn. 787 // Returns true if this view is focusable, |enabled_| and drawn.
786 bool IsFocusable() const; 788 bool IsFocusable() const;
787 789
788 // Return whether this view is focusable when the user requires full keyboard 790 // Return whether this view is focusable when the user requires full keyboard
789 // access, even though it may not be normally focusable. 791 // access, even though it may not be normally focusable.
790 bool IsAccessibilityFocusable() const; 792 bool IsAccessibilityFocusable() const;
791 793
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938 // Invoked from DoDrag after the drag completes. This implementation does 940 // Invoked from DoDrag after the drag completes. This implementation does
939 // nothing, and is intended for subclasses to do cleanup. 941 // nothing, and is intended for subclasses to do cleanup.
940 virtual void OnDragDone(); 942 virtual void OnDragDone();
941 943
942 // Returns true if the mouse was dragged enough to start a drag operation. 944 // Returns true if the mouse was dragged enough to start a drag operation.
943 // delta_x and y are the distance the mouse was dragged. 945 // delta_x and y are the distance the mouse was dragged.
944 static bool ExceededDragThreshold(const gfx::Vector2d& delta); 946 static bool ExceededDragThreshold(const gfx::Vector2d& delta);
945 947
946 // Accessibility ------------------------------------------------------------- 948 // Accessibility -------------------------------------------------------------
947 949
950 // Gets the NativeViewAccessibility instance for this view, and creates one if
951 // it doesn't yet exist.
952 NativeViewAccessibility* GetNativeViewAccessibility();
953
948 // Modifies |state| to reflect the current accessible state of this view. 954 // Modifies |state| to reflect the current accessible state of this view.
949 virtual void GetAccessibleState(ui::AXViewState* state) { } 955 virtual void GetAccessibleState(ui::AXViewState* state) { }
950 956
951 // Returns an instance of the native accessibility interface for this view. 957 // Returns an instance of the native accessibility interface for this view.
952 virtual gfx::NativeViewAccessible GetNativeViewAccessible(); 958 virtual gfx::NativeViewAccessible GetNativeViewAccessible();
953 959
954 // Notifies assistive technology that an accessibility event has 960 // Notifies assistive technology that an accessibility event has
955 // occurred on this view, such as when the view is focused or when its 961 // occurred on this view, such as when the view is focused or when its
956 // value changes. Pass true for |send_native_event| except for rare 962 // value changes. Pass true for |send_native_event| except for rare
957 // cases where the view is a native control that's already sending a 963 // cases where the view is a native control that's already sending a
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1136 // with an associated view. Widget::ReorderNativeViews() may reorder layers 1142 // with an associated view. Widget::ReorderNativeViews() may reorder layers
1137 // below layers owned by a view. 1143 // below layers owned by a view.
1138 virtual void ReorderChildLayers(ui::Layer* parent_layer); 1144 virtual void ReorderChildLayers(ui::Layer* parent_layer);
1139 1145
1140 // Input --------------------------------------------------------------------- 1146 // Input ---------------------------------------------------------------------
1141 1147
1142 virtual DragInfo* GetDragInfo(); 1148 virtual DragInfo* GetDragInfo();
1143 1149
1144 // Focus --------------------------------------------------------------------- 1150 // Focus ---------------------------------------------------------------------
1145 1151
1146 // Returns last set focus behavior.
1147 FocusBehavior focus_behavior() const { return focus_behavior_; }
1148
1149 // Override to be notified when focus has changed either to or from this View. 1152 // Override to be notified when focus has changed either to or from this View.
1150 virtual void OnFocus(); 1153 virtual void OnFocus();
1151 virtual void OnBlur(); 1154 virtual void OnBlur();
1152 1155
1153 // Handle view focus/blur events for this view. 1156 // Handle view focus/blur events for this view.
1154 void Focus(); 1157 void Focus();
1155 void Blur(); 1158 void Blur();
1156 1159
1157 // System events ------------------------------------------------------------- 1160 // System events -------------------------------------------------------------
1158 1161
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1568 // Belongs to this view, but it's reference-counted on some platforms 1571 // Belongs to this view, but it's reference-counted on some platforms
1569 // so we can't use a scoped_ptr. It's dereferenced in the destructor. 1572 // so we can't use a scoped_ptr. It's dereferenced in the destructor.
1570 NativeViewAccessibility* native_view_accessibility_; 1573 NativeViewAccessibility* native_view_accessibility_;
1571 1574
1572 DISALLOW_COPY_AND_ASSIGN(View); 1575 DISALLOW_COPY_AND_ASSIGN(View);
1573 }; 1576 };
1574 1577
1575 } // namespace views 1578 } // namespace views
1576 1579
1577 #endif // UI_VIEWS_VIEW_H_ 1580 #endif // UI_VIEWS_VIEW_H_
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