Flutter Windows Embedder
flutter_platform_node_delegate_windows.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 <oleacc.h>
6 
8 
9 #include "flutter/fml/logging.h"
12 #include "flutter/third_party/accessibility/ax/ax_clipping_behavior.h"
13 #include "flutter/third_party/accessibility/ax/ax_coordinate_system.h"
14 #include "flutter/third_party/accessibility/ax/platform/ax_fragment_root_win.h"
15 
16 namespace flutter {
17 
19  std::weak_ptr<AccessibilityBridge> bridge,
20  FlutterWindowsView* view)
21  : bridge_(bridge), view_(view) {
22  FML_DCHECK(!bridge_.expired())
23  << "Expired AccessibilityBridge passed to node delegate";
24  FML_DCHECK(view_);
25 }
26 
28  if (ax_platform_node_) {
29  ax_platform_node_->Destroy();
30  }
31 }
32 
33 // |ui::AXPlatformNodeDelegate|
34 void FlutterPlatformNodeDelegateWindows::Init(std::weak_ptr<OwnerBridge> bridge,
35  ui::AXNode* node) {
37  ax_platform_node_ = ui::AXPlatformNode::Create(this);
38  FML_DCHECK(ax_platform_node_) << "Failed to create AXPlatformNode";
39 }
40 
41 // |ui::AXPlatformNodeDelegate|
42 gfx::NativeViewAccessible
44  FML_DCHECK(ax_platform_node_) << "AXPlatformNode hasn't been created";
45  return ax_platform_node_->GetNativeViewAccessible();
46 }
47 
48 // |ui::AXPlatformNodeDelegate|
50  int screen_physical_pixel_x,
51  int screen_physical_pixel_y) const {
52  // If this node doesn't contain the point, return.
53  ui::AXOffscreenResult result;
54  gfx::Rect rect = GetBoundsRect(ui::AXCoordinateSystem::kScreenPhysicalPixels,
55  ui::AXClippingBehavior::kUnclipped, &result);
56  gfx::Point screen_point(screen_physical_pixel_x, screen_physical_pixel_y);
57  if (!rect.Contains(screen_point)) {
58  return nullptr;
59  }
60 
61  // If any child in this node's subtree contains the point, return that child.
62  auto bridge = bridge_.lock();
63  FML_DCHECK(bridge);
64  for (const ui::AXNode* child : GetAXNode()->children()) {
65  std::shared_ptr<FlutterPlatformNodeDelegateWindows> win_delegate =
66  std::static_pointer_cast<FlutterPlatformNodeDelegateWindows>(
67  bridge->GetFlutterPlatformNodeDelegateFromID(child->id()).lock());
68  FML_DCHECK(win_delegate)
69  << "No FlutterPlatformNodeDelegate found for node " << child->id();
70  auto hit_view = win_delegate->HitTestSync(screen_physical_pixel_x,
71  screen_physical_pixel_y);
72  if (hit_view) {
73  return hit_view;
74  }
75  }
76 
77  // If no children contain the point, but this node does, return this node.
78  return ax_platform_node_->GetNativeViewAccessible();
79 }
80 
81 // |FlutterPlatformNodeDelegate|
83  const ui::AXCoordinateSystem coordinate_system,
84  const ui::AXClippingBehavior clipping_behavior,
85  ui::AXOffscreenResult* offscreen_result) const {
87  coordinate_system, clipping_behavior, offscreen_result);
88  POINT origin{bounds.x(), bounds.y()};
89  POINT extent{bounds.x() + bounds.width(), bounds.y() + bounds.height()};
90  ClientToScreen(view_->GetWindowHandle(), &origin);
91  ClientToScreen(view_->GetWindowHandle(), &extent);
92  return gfx::Rect(origin.x, origin.y, extent.x - origin.x,
93  extent.y - origin.y);
94 }
95 
97  ax::mojom::Event event_type) {
98  ax_platform_node_->NotifyAccessibilityEvent(event_type);
99 }
100 
102  VARIANT varchild{};
103  varchild.vt = VT_I4;
104  varchild.lVal = CHILDID_SELF;
105  GetNativeViewAccessible()->accSelect(SELFLAG_TAKEFOCUS, varchild);
106 }
107 
108 gfx::AcceleratedWidget
110  return view_->GetWindowHandle();
111 }
112 
114  const {
115  return ax_platform_node_;
116 }
117 
118 } // namespace flutter
flutter::FlutterWindowsView
Definition: flutter_windows_view.h:34
flutter::FlutterPlatformNodeDelegateWindows::GetNativeViewAccessible
gfx::NativeViewAccessible GetNativeViewAccessible() override
Definition: flutter_platform_node_delegate_windows.cc:43
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::FlutterPlatformNodeDelegateWindows::FlutterPlatformNodeDelegateWindows
FlutterPlatformNodeDelegateWindows(std::weak_ptr< AccessibilityBridge > bridge, FlutterWindowsView *view)
Definition: flutter_platform_node_delegate_windows.cc:18
flutter::FlutterPlatformNodeDelegateWindows::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_windows.cc:82
flutter::FlutterPlatformNodeDelegateWindows::DispatchWinAccessibilityEvent
virtual void DispatchWinAccessibilityEvent(ax::mojom::Event event_type)
Definition: flutter_platform_node_delegate_windows.cc:96
flutter::FlutterPlatformNodeDelegateWindows::GetTargetForNativeAccessibilityEvent
gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() override
Definition: flutter_platform_node_delegate_windows.cc:109
flutter::FlutterPlatformNodeDelegateWindows::HitTestSync
gfx::NativeViewAccessible HitTestSync(int screen_physical_pixel_x, int screen_physical_pixel_y) const override
Definition: flutter_platform_node_delegate_windows.cc:49
flutter::FlutterWindowsView::GetWindowHandle
virtual HWND GetWindowHandle() const
Definition: flutter_windows_view.cc:758
flutter::FlutterPlatformNodeDelegateWindows::Init
void Init(std::weak_ptr< OwnerBridge > bridge, ui::AXNode *node) override
Called only once, immediately after construction. The constructor doesn't take any arguments because ...
Definition: flutter_platform_node_delegate_windows.cc:34
flutter_windows_view.h
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::FlutterPlatformNodeDelegateWindows::GetPlatformNode
ui::AXPlatformNode * GetPlatformNode() const override
Definition: flutter_platform_node_delegate_windows.cc:113
accessibility_bridge_windows.h
flutter
Definition: accessibility_bridge_windows.cc:11
flutter::FlutterPlatformNodeDelegateWindows::~FlutterPlatformNodeDelegateWindows
virtual ~FlutterPlatformNodeDelegateWindows()
Definition: flutter_platform_node_delegate_windows.cc:27
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_platform_node_delegate_windows.h
flutter::FlutterPlatformNodeDelegateWindows::SetFocus
void SetFocus()
Definition: flutter_platform_node_delegate_windows.cc:101
event_type
ax::mojom::Event event_type
Definition: accessibility_bridge_windows_unittests.cc:34