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FlutterPlatformNodeDelegateMac.mm
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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 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterPlatformNodeDelegateMac.h"
6
7 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterAppDelegate.h"
8 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterEngine_Internal.h"
9 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterTextInputSemanticsObject.h"
10 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterViewController_Internal.h"
11
12 #include "flutter/shell/platform/common/accessibility_bridge.h"
13 #include "flutter/third_party/accessibility/ax/ax_action_data.h"
14 #include "flutter/third_party/accessibility/ax/ax_node_position.h"
15 #include "flutter/third_party/accessibility/ax/platform/ax_platform_node.h"
16 #include "flutter/third_party/accessibility/ax/platform/ax_platform_node_base.h"
17 #include "flutter/third_party/accessibility/base/string_utils.h"
18 #include "flutter/third_party/accessibility/gfx/geometry/rect_conversions.h"
19 #include "flutter/third_party/accessibility/gfx/mac/coordinate_conversion.h"
20
21 namespace flutter { // namespace
22
23 FlutterPlatformNodeDelegateMac::FlutterPlatformNodeDelegateMac(
24 std::weak_ptr<AccessibilityBridge> bridge,
25 __weak FlutterViewController* view_controller)
26 : bridge_(std::move(bridge)), view_controller_(view_controller) {}
27
28 void FlutterPlatformNodeDelegateMac::Init(std::weak_ptr<OwnerBridge> bridge, ui::AXNode* node) {
29 FlutterPlatformNodeDelegate::Init(bridge, node);
30 if (GetData().IsTextField()) {
31 ax_platform_node_ = new FlutterTextPlatformNode(this, view_controller_);
32 } else {
33 ax_platform_node_ = ui::AXPlatformNode::Create(this);
34 }
35 NSCAssert(ax_platform_node_, @"Failed to create platform node.");
36 }
37
38 FlutterPlatformNodeDelegateMac::~FlutterPlatformNodeDelegateMac() {
39 // Destroy() also calls delete on itself.
40 ax_platform_node_->Destroy();
41 }
42
43 gfx::NativeViewAccessible FlutterPlatformNodeDelegateMac::GetNativeViewAccessible() {
44 NSCAssert(ax_platform_node_, @"Platform node does not exist.");
45 return ax_platform_node_->GetNativeViewAccessible();
46 }
47
48 gfx::NativeViewAccessible FlutterPlatformNodeDelegateMac::GetParent() {
49 gfx::NativeViewAccessible parent = FlutterPlatformNodeDelegate::GetParent();
50 if (!parent) {
51 NSCAssert(view_controller_.viewLoaded, @"Flutter view must be loaded");
52 return view_controller_.flutterView;
53 }
54 return parent;
55 }
56
57 gfx::Rect FlutterPlatformNodeDelegateMac::GetBoundsRect(
58 const ui::AXCoordinateSystem coordinate_system,
59 const ui::AXClippingBehavior clipping_behavior,
60 ui::AXOffscreenResult* offscreen_result) const {
61 gfx::Rect local_bounds = FlutterPlatformNodeDelegate::GetBoundsRect(
62 coordinate_system, clipping_behavior, offscreen_result);
63 gfx::RectF local_bounds_f(local_bounds);
64 gfx::RectF screen_bounds = ConvertBoundsFromLocalToScreen(local_bounds_f);
65 return gfx::ToEnclosingRect(ConvertBoundsFromScreenToGlobal(screen_bounds));
66 }
67
68 gfx::NativeViewAccessible FlutterPlatformNodeDelegateMac::GetNSWindow() {
69 FlutterAppDelegate* appDelegate = (FlutterAppDelegate*)[NSApp delegate];
70 return appDelegate.mainFlutterWindow;
71 }
72
73 std::string FlutterPlatformNodeDelegateMac::GetLiveRegionText() const {
74 if (GetAXNode()->IsIgnored()) {
75 return "";
76 }
77
78 std::string text = GetData().GetStringAttribute(ax::mojom::StringAttribute::kName);
79 if (!text.empty()) {
80 return text;
81 };
82 auto bridge_ptr = bridge_.lock();
83 NSCAssert(bridge_ptr, @"Accessibility bridge in flutter engine must not be null.");
84 for (int32_t child : GetData().child_ids) {
85 auto delegate_child = bridge_ptr->GetFlutterPlatformNodeDelegateFromID(child).lock();
86 if (!delegate_child) {
87 continue;
88 }
89 text += std::static_pointer_cast<FlutterPlatformNodeDelegateMac>(delegate_child)
90 ->GetLiveRegionText();
91 }
92 return text;
93 }
94
95 gfx::RectF FlutterPlatformNodeDelegateMac::ConvertBoundsFromLocalToScreen(
96 const gfx::RectF& local_bounds) const {
97 // Converts to NSRect to use NSView rect conversion.
98 NSRect ns_local_bounds =
99 NSMakeRect(local_bounds.x(), local_bounds.y(), local_bounds.width(), local_bounds.height());
100 // The macOS XY coordinates start at bottom-left and increase toward top-right,
101 // which is different from the Flutter's XY coordinates that start at top-left
102 // increasing to bottom-right. Therefore, this method needs to flip the y coordinate when
103 // it converts the bounds from flutter coordinates to macOS coordinates.
104 ns_local_bounds.origin.y = -ns_local_bounds.origin.y - ns_local_bounds.size.height;
105
106 NSCAssert(view_controller_.viewLoaded, @"Flutter view must be loaded.");
107 NSRect ns_view_bounds = [view_controller_.flutterView convertRectFromBacking:ns_local_bounds];
108 NSRect ns_window_bounds = [view_controller_.flutterView convertRect:ns_view_bounds toView:nil];
109 NSRect ns_screen_bounds =
110 [[view_controller_.flutterView window] convertRectToScreen:ns_window_bounds];
111 gfx::RectF screen_bounds(ns_screen_bounds.origin.x, ns_screen_bounds.origin.y,
112 ns_screen_bounds.size.width, ns_screen_bounds.size.height);
113 return screen_bounds;
114 }
115
116 gfx::RectF FlutterPlatformNodeDelegateMac::ConvertBoundsFromScreenToGlobal(
117 const gfx::RectF& screen_bounds) const {
118 // The VoiceOver seems to only accept bounds that are relative to primary screen.
119 // Thus, this method uses [[NSScreen screens] firstObject] instead of [NSScreen mainScreen].
120 NSScreen* screen = [[NSScreen screens] firstObject];
121 NSRect primary_screen_bounds = [screen frame];
122 // The screen is flipped against y axis.
123 float flipped_y = primary_screen_bounds.size.height - screen_bounds.y() - screen_bounds.height();
124 return {screen_bounds.x(), flipped_y, screen_bounds.width(), screen_bounds.height()};
125 }
126
127 } // namespace flutter
flutter::FlutterPlatformNodeDelegateMac::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: FlutterPlatformNodeDelegateMac.mm:28
flutter::FlutterPlatformNodeDelegateMac::GetLiveRegionText
std::string GetLiveRegionText() const
Gets the live region text of this node in UTF-8 format. This is useful to determine the changes in be...
Definition: FlutterPlatformNodeDelegateMac.mm:73
FlutterViewController
Definition: FlutterViewController.h:73
flutter::FlutterTextPlatformNode
The ax platform node for a text field.
Definition: FlutterTextInputSemanticsObject.h:22
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
FlutterEngine_Internal.h
flutter::FlutterPlatformNodeDelegateMac::FlutterPlatformNodeDelegateMac
FlutterPlatformNodeDelegateMac(std::weak_ptr< AccessibilityBridge > bridge, __weak FlutterViewController *view_controller)
Definition: FlutterPlatformNodeDelegateMac.mm:23
flutter::FlutterPlatformNodeDelegate::GetData
const ui::AXNodeData & GetData() const override
Definition: flutter_platform_node_delegate.cc:60
flutter::FlutterPlatformNodeDelegateMac::GetNSWindow
gfx::NativeViewAccessible GetNSWindow() override
Definition: FlutterPlatformNodeDelegateMac.mm:68
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
FlutterPlatformNodeDelegateMac.h
flutter::FlutterPlatformNodeDelegateMac::GetParent
gfx::NativeViewAccessible GetParent() override
Definition: FlutterPlatformNodeDelegateMac.mm:48
flutter
Definition: AccessibilityBridgeMac.h:16
FlutterAppDelegate
Definition: FlutterAppDelegate.h:54
FlutterAppDelegate.h
flutter::FlutterPlatformNodeDelegateMac::~FlutterPlatformNodeDelegateMac
virtual ~FlutterPlatformNodeDelegateMac()
Definition: FlutterPlatformNodeDelegateMac.mm:38
FlutterAppDelegate::mainFlutterWindow
IBOutlet NSWindow * mainFlutterWindow
Definition: FlutterAppDelegate.h:65
flutter::FlutterPlatformNodeDelegateMac::GetBoundsRect
gfx::Rect GetBoundsRect(const ui::AXCoordinateSystem coordinate_system, const ui::AXClippingBehavior clipping_behavior, ui::AXOffscreenResult *offscreen_result) const override
Definition: FlutterPlatformNodeDelegateMac.mm:57
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::FlutterPlatformNodeDelegateMac::GetNativeViewAccessible
gfx::NativeViewAccessible GetNativeViewAccessible() override
Definition: FlutterPlatformNodeDelegateMac.mm:43
FlutterViewController_Internal.h
flutter::FlutterPlatformNodeDelegate::GetParent
gfx::NativeViewAccessible GetParent() override
Definition: flutter_platform_node_delegate.cc:64
FlutterTextInputSemanticsObject.h
accessibility_bridge.h