| Flutter Windows Embedder |

host_window_tooltip.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/shell/platform/windows/host_window_tooltip.h"
6 #include <cstdio>
7 #include "flutter/shell/platform/windows/flutter_windows_view_controller.h"
8 #include "shell/platform/windows/window_manager.h"
9
10 namespace flutter {
11 HostWindowTooltip::HostWindowTooltip(
12 WindowManager* window_manager,
13 FlutterWindowsEngine* engine,
14 const BoxConstraints& constraints,
15 GetWindowPositionCallback get_position_callback,
16 HWND parent)
17 : HostWindow(window_manager, engine),
18 get_position_callback_(get_position_callback),
19 parent_(parent),
20 isolate_(Isolate::Current()),
21 view_alive_(std::make_shared<int>(0)) {
22 // Use minimum constraints as initial size to ensure the view can be created
23 // with valid metrics.
24 auto const initial_width =
25 static_cast<double>(constraints.smallest().width());
26 auto const initial_height =
27 static_cast<double>(constraints.smallest().height());
28
29 InitializeFlutterView(HostWindowInitializationParams{
30 .archetype = WindowArchetype::kTooltip,
31 .window_style = WS_POPUP,
32 .extended_window_style = WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW,
33 .box_constraints = constraints,
34 .initial_window_rect = {{0, 0}, {initial_width, initial_height}},
35 .title = L"",
36 .owner_window = parent,
37 .nCmdShow = SW_SHOWNOACTIVATE,
38 .sizing_delegate = this,
39 .is_sized_to_content = true});
40 SetWindowLongPtr(window_handle_, GWLP_HWNDPARENT,
41 reinterpret_cast<LONG_PTR>(parent_));
42 }
43
44 void HostWindowTooltip::DidUpdateViewSize(int32_t width, int32_t height) {
45 // This is called from the raster thread.
46 std::weak_ptr<int> weak_view_alive = view_alive_;
47 engine_->task_runner()->PostTask([this, width, height, weak_view_alive]() {
48 auto const view_alive = weak_view_alive.lock();
49 if (!view_alive) {
50 return;
51 }
52 if (width_ == width && height_ == height) {
53 return;
54 }
55
56 if (is_being_destroyed_) {
57 return;
58 }
59
60 width_ = width;
61 height_ = height;
62 UpdatePosition();
63 });
64 }
65
66 WindowRect HostWindowTooltip::GetWorkArea() const {
67 constexpr int32_t kDefaultWorkAreaSize = 10000;
68 WindowRect work_area = {0, 0, kDefaultWorkAreaSize, kDefaultWorkAreaSize};
69 HMONITOR monitor = MonitorFromWindow(parent_, MONITOR_DEFAULTTONEAREST);
70 if (monitor) {
71 MONITORINFO monitor_info = {0};
72 monitor_info.cbSize = sizeof(monitor_info);
73 if (GetMonitorInfo(monitor, &monitor_info)) {
74 work_area.left = monitor_info.rcWork.left;
75 work_area.top = monitor_info.rcWork.top;
76 work_area.width = monitor_info.rcWork.right - monitor_info.rcWork.left;
77 work_area.height = monitor_info.rcWork.bottom - monitor_info.rcWork.top;
78 }
79 }
80 return work_area;
81 }
82
83 void HostWindowTooltip::UpdatePosition() {
84 RECT parent_client_rect;
85 GetClientRect(parent_, &parent_client_rect);
86
87 // Convert top-left and bottom-right points to screen coordinates.
88 POINT parent_top_left = {parent_client_rect.left, parent_client_rect.top};
89 POINT parent_bottom_right = {parent_client_rect.right,
90 parent_client_rect.bottom};
91
92 ClientToScreen(parent_, &parent_top_left);
93 ClientToScreen(parent_, &parent_bottom_right);
94
95 // Get monitor from HWND and usable work area.
96 HMONITOR monitor = MonitorFromWindow(parent_, MONITOR_DEFAULTTONEAREST);
97 WindowRect work_area = GetWorkArea();
98
99 IsolateScope scope(isolate_);
100 auto rect = get_position_callback_(
101 WindowSize{width_, height_},
102 WindowRect{parent_top_left.x, parent_top_left.y,
103 parent_bottom_right.x - parent_top_left.x,
104 parent_bottom_right.y - parent_top_left.y},
105 work_area);
106 SetWindowPos(window_handle_, nullptr, rect->left, rect->top, rect->width,
107 rect->height, SWP_NOACTIVATE | SWP_NOOWNERZORDER);
108 free(rect);
109
110 // The positioner constrained the dimensions more than current size, apply
111 // positioner constraints.
112 if (rect->width < width_ || rect->height < height_) {
113 auto metrics_event = view_controller_->view()->CreateWindowMetricsEvent();
114 view_controller_->engine()->SendWindowMetricsEvent(metrics_event);
115 }
116 }
117
118 LRESULT HostWindowTooltip::HandleMessage(HWND hwnd,
119 UINT message,
120 WPARAM wparam,
121 LPARAM lparam) {
122 switch (message) {
123 case WM_MOUSEACTIVATE:
124 // Prevent activation when clicked
125 return MA_NOACTIVATE;
126
127 case WM_NCACTIVATE:
128 // Return TRUE to prevent visual activation changes
129 return TRUE;
130
131 case WM_ACTIVATE:
132 // Immediately deactivate if somehow activated
133 if (LOWORD(wparam) != WA_INACTIVE) {
134 HWND hFocus = GetFocus();
135 SetFocus(nullptr);
136 }
137 break;
138 }
139
140 return HostWindow::HandleMessage(hwnd, message, wparam, lparam);
141 }
142
143 } // namespace flutter
flutter::FlutterWindowsEngine
Definition: flutter_windows_engine.h:92
flutter::FlutterWindowsEngine::task_runner
TaskRunner * task_runner()
Definition: flutter_windows_engine.h:173
flutter::HostWindow
Definition: host_window.h:29
flutter::HostWindow::window_handle_
HWND window_handle_
Definition: host_window.h:222
flutter::HostWindow::InitializeFlutterView
void InitializeFlutterView(HostWindowInitializationParams const &params)
Definition: host_window.cc:244
flutter::HostWindow::view_controller_
std::unique_ptr< FlutterWindowsViewController > view_controller_
Definition: host_window.h:216
flutter::HostWindow::is_being_destroyed_
bool is_being_destroyed_
Definition: host_window.h:228
flutter::HostWindow::engine_
FlutterWindowsEngine * engine_
Definition: host_window.h:211
flutter::HostWindow::HandleMessage
virtual LRESULT HandleMessage(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
Definition: host_window.cc:384
flutter::HostWindowTooltip::HandleMessage
LRESULT HandleMessage(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) override
Definition: host_window_tooltip.cc:118
flutter::HostWindowTooltip::UpdatePosition
void UpdatePosition()
Definition: host_window_tooltip.cc:83
flutter::HostWindowTooltip::HostWindowTooltip
HostWindowTooltip(WindowManager *window_manager, FlutterWindowsEngine *engine, const BoxConstraints &constraints, GetWindowPositionCallback get_position_callback, HWND parent)
Definition: host_window_tooltip.cc:11
flutter::Isolate
Definition: isolate_scope.h:15
flutter::IsolateScope
Definition: isolate_scope.h:33
flutter::TaskRunner::PostTask
void PostTask(TaskClosure task)
Definition: task_runner.cc:89
flutter::WindowManager
Definition: window_manager.h:108
flutter_windows_view_controller.h
host_window_tooltip.h
message
Win32Message message
Definition: keyboard_unittests.cc:137
flutter
Definition: accessibility_bridge_windows.cc:11
flutter::GetWindowPositionCallback
WindowRect *(* GetWindowPositionCallback)(const WindowSize &child_size, const WindowRect &parent_rect, const WindowRect &output_rect)
Definition: window_manager.h:69
flutter::WindowArchetype::kTooltip
@ kTooltip
flutter::HostWindow::HostWindowInitializationParams
Definition: host_window.h:118
flutter::HostWindow::HostWindowInitializationParams::archetype
WindowArchetype archetype
Definition: host_window.h:119
flutter::WindowRect
Definition: window_manager.h:42
flutter::WindowSize
Definition: window_manager.h:50
window_manager.h