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flutter_platform_node_delegate.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "flutter_platform_node_delegate.h"
6
7 #include <utility>
8
9 #include "flutter/shell/platform/common/accessibility_bridge.h"
10 #include "flutter/third_party/accessibility/ax/ax_action_data.h"
11 #include "flutter/third_party/accessibility/ax/ax_tree_manager_map.h"
12 #include "flutter/third_party/accessibility/gfx/geometry/rect_conversions.h"
13
14 namespace flutter {
15
16 FlutterPlatformNodeDelegate::FlutterPlatformNodeDelegate() = default;
17
18 FlutterPlatformNodeDelegate::~FlutterPlatformNodeDelegate() = default;
19
20 void FlutterPlatformNodeDelegate::Init(std::weak_ptr<OwnerBridge> bridge,
21 ui::AXNode* node) {
22 bridge_ = std::move(bridge);
23 ax_node_ = node;
24 }
25
26 ui::AXNode* FlutterPlatformNodeDelegate::GetAXNode() const {
27 return ax_node_;
28 }
29
30 bool FlutterPlatformNodeDelegate::AccessibilityPerformAction(
31 const ui::AXActionData& data) {
32 AccessibilityNodeId target = ax_node_->id();
33 auto bridge_ptr = bridge_.lock();
34 BASE_DCHECK(bridge_ptr);
35 switch (data.action) {
36 case ax::mojom::Action::kDoDefault:
37 bridge_ptr->DispatchAccessibilityAction(
38 target, FlutterSemanticsAction::kFlutterSemanticsActionTap, {});
39 return true;
40 case ax::mojom::Action::kFocus:
41 bridge_ptr->SetLastFocusedId(target);
42 bridge_ptr->DispatchAccessibilityAction(
43 target,
44 FlutterSemanticsAction::
45 kFlutterSemanticsActionDidGainAccessibilityFocus,
46 {});
47 return true;
48 case ax::mojom::Action::kScrollToMakeVisible:
49 bridge_ptr->DispatchAccessibilityAction(
50 target, FlutterSemanticsAction::kFlutterSemanticsActionShowOnScreen,
51 {});
52 return true;
53 // TODO(chunhtai): support more actions.
54 default:
55 return false;
56 }
57 return false;
58 }
59
60 const ui::AXNodeData& FlutterPlatformNodeDelegate::GetData() const {
61 return ax_node_->data();
62 }
63
64 gfx::NativeViewAccessible FlutterPlatformNodeDelegate::GetParent() {
65 if (!ax_node_->parent()) {
66 return nullptr;
67 }
68 auto bridge_ptr = bridge_.lock();
69 BASE_DCHECK(bridge_ptr);
70 return bridge_ptr->GetNativeAccessibleFromId(ax_node_->parent()->id());
71 }
72
73 gfx::NativeViewAccessible FlutterPlatformNodeDelegate::GetFocus() {
74 auto bridge_ptr = bridge_.lock();
75 BASE_DCHECK(bridge_ptr);
76 AccessibilityNodeId last_focused = bridge_ptr->GetLastFocusedId();
77 if (last_focused == ui::AXNode::kInvalidAXID) {
78 return nullptr;
79 }
80 return bridge_ptr->GetNativeAccessibleFromId(last_focused);
81 }
82
83 int FlutterPlatformNodeDelegate::GetChildCount() const {
84 return static_cast<int>(ax_node_->GetUnignoredChildCount());
85 }
86
87 gfx::NativeViewAccessible FlutterPlatformNodeDelegate::ChildAtIndex(int index) {
88 auto bridge_ptr = bridge_.lock();
89 BASE_DCHECK(bridge_ptr);
90 AccessibilityNodeId child = ax_node_->GetUnignoredChildAtIndex(index)->id();
91 return bridge_ptr->GetNativeAccessibleFromId(child);
92 }
93
94 gfx::Rect FlutterPlatformNodeDelegate::GetBoundsRect(
95 const ui::AXCoordinateSystem coordinate_system,
96 const ui::AXClippingBehavior clipping_behavior,
97 ui::AXOffscreenResult* offscreen_result) const {
98 auto bridge_ptr = bridge_.lock();
99 BASE_DCHECK(bridge_ptr);
100 // TODO(chunhtai): We need to apply screen dpr in here.
101 // https://github.com/flutter/flutter/issues/74283
102 const bool clip_bounds =
103 clipping_behavior == ui::AXClippingBehavior::kClipped;
104 bool offscreen = false;
105 gfx::RectF bounds =
106 bridge_ptr->RelativeToGlobalBounds(ax_node_, offscreen, clip_bounds);
107 if (offscreen_result != nullptr) {
108 *offscreen_result = offscreen ? ui::AXOffscreenResult::kOffscreen
109 : ui::AXOffscreenResult::kOnscreen;
110 }
111 return gfx::ToEnclosingRect(bounds);
112 }
113
114 std::weak_ptr<FlutterPlatformNodeDelegate::OwnerBridge>
115 FlutterPlatformNodeDelegate::GetOwnerBridge() const {
116 return bridge_;
117 }
118
119 ui::AXPlatformNode* FlutterPlatformNodeDelegate::GetPlatformNode() const {
120 return nullptr;
121 }
122
123 gfx::NativeViewAccessible
124 FlutterPlatformNodeDelegate::GetLowestPlatformAncestor() const {
125 auto bridge_ptr = bridge_.lock();
126 BASE_DCHECK(bridge_ptr);
127 auto lowest_platform_ancestor = ax_node_->GetLowestPlatformAncestor();
128 if (lowest_platform_ancestor) {
129 return bridge_ptr->GetNativeAccessibleFromId(
130 ax_node_->GetLowestPlatformAncestor()->id());
131 }
132 return nullptr;
133 }
134
135 ui::AXNodePosition::AXPositionInstance
136 FlutterPlatformNodeDelegate::CreateTextPositionAt(int offset) const {
137 return ui::AXNodePosition::CreatePosition(*ax_node_, offset);
138 }
139
140 ui::AXPlatformNode* FlutterPlatformNodeDelegate::GetFromNodeID(
141 int32_t node_id) {
142 ui::AXTreeManager* tree_manager =
143 ui::AXTreeManagerMap::GetInstance().GetManager(
144 ax_node_->tree()->GetAXTreeID());
145 AccessibilityBridge* platform_manager =
146 static_cast<AccessibilityBridge*>(tree_manager);
147 return platform_manager->GetPlatformNodeFromTree(node_id);
148 }
149
150 ui::AXPlatformNode* FlutterPlatformNodeDelegate::GetFromTreeIDAndNodeID(
151 const ui::AXTreeID& tree_id,
152 int32_t node_id) {
153 ui::AXTreeManager* tree_manager =
154 ui::AXTreeManagerMap::GetInstance().GetManager(tree_id);
155 AccessibilityBridge* platform_manager =
156 static_cast<AccessibilityBridge*>(tree_manager);
157 return platform_manager->GetPlatformNodeFromTree(node_id);
158 }
159
160 const ui::AXTree::Selection FlutterPlatformNodeDelegate::GetUnignoredSelection()
161 const {
162 return ax_node_->GetUnignoredSelection();
163 }
164
165 } // namespace flutter
flutter::AccessibilityBridge
Definition: accessibility_bridge.h:36
flutter::AccessibilityBridge::GetPlatformNodeFromTree
ui::AXPlatformNode * GetPlatformNodeFromTree(const ui::AXNode::AXID node_id) const override
Definition: accessibility_bridge.cc:710
flutter::FlutterPlatformNodeDelegate::CreateTextPositionAt
ui::AXNodePosition::AXPositionInstance CreateTextPositionAt(int offset) const override
Definition: flutter_platform_node_delegate.cc:136
flutter::FlutterPlatformNodeDelegate::GetParent
gfx::NativeViewAccessible GetParent() override
Definition: flutter_platform_node_delegate.cc:64
flutter::FlutterPlatformNodeDelegate::GetBoundsRect
gfx::Rect GetBoundsRect(const ui::AXCoordinateSystem coordinate_system, const ui::AXClippingBehavior clipping_behavior, ui::AXOffscreenResult *offscreen_result) const override
Definition: flutter_platform_node_delegate.cc:94
flutter::FlutterPlatformNodeDelegate::GetLowestPlatformAncestor
gfx::NativeViewAccessible GetLowestPlatformAncestor() const override
Definition: flutter_platform_node_delegate.cc:124
flutter::FlutterPlatformNodeDelegate::GetUnignoredSelection
virtual const ui::AXTree::Selection GetUnignoredSelection() const override
Definition: flutter_platform_node_delegate.cc:160
flutter::FlutterPlatformNodeDelegate::Init
virtual void Init(std::weak_ptr< OwnerBridge > bridge, ui::AXNode *node)
Called only once, immediately after construction. The constructor doesn't take any arguments because ...
Definition: flutter_platform_node_delegate.cc:20
flutter::FlutterPlatformNodeDelegate::FlutterPlatformNodeDelegate
FlutterPlatformNodeDelegate()
flutter::FlutterPlatformNodeDelegate::GetChildCount
int GetChildCount() const override
Definition: flutter_platform_node_delegate.cc:83
flutter::FlutterPlatformNodeDelegate::GetOwnerBridge
std::weak_ptr< OwnerBridge > GetOwnerBridge() const
Gets the owner of this platform node delegate. This is useful when you want to get the information ab...
Definition: flutter_platform_node_delegate.cc:115
flutter::FlutterPlatformNodeDelegate::GetPlatformNode
virtual ui::AXPlatformNode * GetPlatformNode() const
Definition: flutter_platform_node_delegate.cc:119
flutter::FlutterPlatformNodeDelegate::GetAXNode
ui::AXNode * GetAXNode() const
Gets the underlying ax node for this platform node delegate.
Definition: flutter_platform_node_delegate.cc:26
flutter::FlutterPlatformNodeDelegate::GetFromNodeID
virtual ui::AXPlatformNode * GetFromNodeID(int32_t id) override
Definition: flutter_platform_node_delegate.cc:140
flutter::FlutterPlatformNodeDelegate::GetData
const ui::AXNodeData & GetData() const override
Definition: flutter_platform_node_delegate.cc:60
flutter::FlutterPlatformNodeDelegate::~FlutterPlatformNodeDelegate
virtual ~FlutterPlatformNodeDelegate() override
flutter::FlutterPlatformNodeDelegate::GetFromTreeIDAndNodeID
virtual ui::AXPlatformNode * GetFromTreeIDAndNodeID(const ui::AXTreeID &tree_id, int32_t node_id) override
Definition: flutter_platform_node_delegate.cc:150
flutter::FlutterPlatformNodeDelegate::AccessibilityPerformAction
bool AccessibilityPerformAction(const ui::AXActionData &data) override
Definition: flutter_platform_node_delegate.cc:30
flutter::FlutterPlatformNodeDelegate::ChildAtIndex
gfx::NativeViewAccessible ChildAtIndex(int index) override
Definition: flutter_platform_node_delegate.cc:87
flutter::FlutterPlatformNodeDelegate::GetFocus
gfx::NativeViewAccessible GetFocus() override
Definition: flutter_platform_node_delegate.cc:73
accessibility_bridge.h
flutter_platform_node_delegate.h
flutter
Definition: accessibility_bridge.h:26
flutter::AccessibilityNodeId
ui::AXNode::AXID AccessibilityNodeId
Definition: flutter_platform_node_delegate.h:15