forked from chromium/chromium
-
Notifications
You must be signed in to change notification settings - Fork 0
/
drag_window_controller.cc
249 lines (217 loc) · 9.01 KB
/
drag_window_controller.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/wm/drag_window_controller.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/shell.h"
#include "ash/wm/window_mirror_view.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/client/screen_position_client.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/aura/window_tree_host.h"
#include "ui/base/hit_test.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/paint_context.h"
#include "ui/compositor_extra/shadow.h"
#include "ui/display/display.h"
#include "ui/gfx/transform_util.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/core/coordinate_conversion.h"
#include "ui/wm/core/cursor_manager.h"
#include "ui/wm/core/shadow_types.h"
#include "ui/wm/core/window_util.h"
namespace ash {
namespace {
// The maximum opacity of the drag phantom window.
constexpr float kDragPhantomMaxOpacity = 0.8f;
// Computes an opacity value for |dragged_window| or for a drag window that
// represents |dragged_window| on |root_window|.
float GetDragWindowOpacity(aura::Window* root_window,
aura::Window* dragged_window,
bool is_touch_dragging) {
// For touch dragging, the present function should only need to be used for
// the drag windows; the opacity of the original window can simply be set to 1
// in the constructor and reverted in the destructor.
DCHECK(!is_touch_dragging || dragged_window->GetRootWindow() != root_window);
// For mouse dragging, if the mouse is in |root_window|, then return 1.
if (!is_touch_dragging && Shell::Get()->cursor_manager()->GetDisplay().id() ==
display::Screen::GetScreen()
->GetDisplayNearestWindow(root_window)
.id()) {
return 1.f;
}
// Return an opacity value based on what fraction of |dragged_window| is
// contained in |root_window|.
gfx::Rect dragged_window_bounds = dragged_window->bounds();
::wm::ConvertRectToScreen(dragged_window->parent(), &dragged_window_bounds);
gfx::RectF transformed_dragged_window_bounds(dragged_window_bounds);
gfx::TransformAboutPivot(dragged_window_bounds.origin(),
dragged_window->transform())
.TransformRect(&transformed_dragged_window_bounds);
gfx::RectF visible_bounds(root_window->GetBoundsInScreen());
visible_bounds.Intersect(transformed_dragged_window_bounds);
return kDragPhantomMaxOpacity * visible_bounds.size().GetArea() /
transformed_dragged_window_bounds.size().GetArea();
}
} // namespace
// This keeps track of the drag window's state. It creates/destroys/updates
// bounds and opacity based on the current bounds.
class DragWindowController::DragWindowDetails {
public:
explicit DragWindowDetails(const display::Display& display)
: root_window_(Shell::GetRootWindowForDisplayId(display.id())) {}
DragWindowDetails(const DragWindowDetails&) = delete;
DragWindowDetails& operator=(const DragWindowDetails&) = delete;
~DragWindowDetails() = default;
void Update(aura::Window* original_window,
bool is_touch_dragging,
const base::Optional<gfx::Rect>& shadow_bounds) {
const float opacity =
GetDragWindowOpacity(root_window_, original_window, is_touch_dragging);
if (opacity == 0.f) {
shadow_.reset();
widget_.reset();
return;
}
if (!widget_)
CreateDragWindow(original_window, shadow_bounds);
gfx::Rect bounds = original_window->bounds();
aura::Window* window = widget_->GetNativeWindow();
aura::Window::ConvertRectToTarget(original_window->parent(),
window->parent(), &bounds);
window->SetBounds(bounds);
window->SetTransform(original_window->transform());
widget_->SetOpacity(opacity);
}
private:
friend class DragWindowController;
void CreateDragWindow(aura::Window* original_window,
const base::Optional<gfx::Rect>& shadow_bounds) {
DCHECK(!widget_);
views::Widget::InitParams params;
params.type = views::Widget::InitParams::TYPE_POPUP;
params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
params.opacity = views::Widget::InitParams::WindowOpacity::kTranslucent;
params.layer_type = ui::LAYER_NOT_DRAWN;
params.name = "DragWindow";
params.activatable = views::Widget::InitParams::Activatable::ACTIVATABLE_NO;
params.accept_events = false;
const int parent_id = original_window->parent()->id();
params.parent = root_window_->GetChildById(parent_id);
widget_ = std::make_unique<views::Widget>();
widget_->set_focus_on_creation(false);
widget_->Init(std::move(params));
// TODO(crbug.com/1026746): Change this to WindowPreviewView.
// WindowPreviewView can show transient children, but currently does not
// show popups due to performance reasons. WindowPreviewView also needs to
// be modified so that it can optionally be clipped to the main window's
// bounds.
widget_->SetContentsView(std::make_unique<WindowMirrorView>(
original_window, /*trilinear_filtering_on_init=*/false,
/*show_non_client_view=*/true));
aura::Window* window = widget_->GetNativeWindow();
window->set_id(kShellWindowId_PhantomWindow);
window->SetProperty(aura::client::kAnimationsDisabledKey, true);
gfx::Rect bounds = original_window->bounds();
::wm::ConvertRectToScreen(original_window->parent(), &bounds);
window->SetBounds(bounds);
if (shadow_bounds) {
shadow_ = std::make_unique<ui::Shadow>();
shadow_->Init(::wm::kShadowElevationActiveWindow);
shadow_->SetContentBounds(*shadow_bounds);
widget_->GetLayer()->Add(shadow_->layer());
} else {
::wm::SetShadowElevation(window, ::wm::kShadowElevationActiveWindow);
}
// Show the widget the setup is done.
widget_->Show();
}
// The root window of |widget_|.
aura::Window* root_window_;
// Contains a WindowMirrorView which is a copy of the original window.
std::unique_ptr<views::Widget> widget_;
// Optional custom shadow if one is given.
std::unique_ptr<ui::Shadow> shadow_;
};
DragWindowController::DragWindowController(
aura::Window* window,
bool is_touch_dragging,
const base::Optional<gfx::Rect>& shadow_bounds)
: window_(window),
is_touch_dragging_(is_touch_dragging),
shadow_bounds_(shadow_bounds),
old_opacity_(window->layer()->opacity()) {
window->layer()->SetOpacity(1.f);
DCHECK(drag_windows_.empty());
display::Screen* screen = display::Screen::GetScreen();
display::Display current = screen->GetDisplayNearestWindow(window_);
for (const display::Display& display : screen->GetAllDisplays()) {
if (current.id() == display.id())
continue;
drag_windows_.push_back(std::make_unique<DragWindowDetails>(display));
}
}
DragWindowController::~DragWindowController() {
window_->layer()->SetOpacity(old_opacity_);
}
void DragWindowController::Update() {
// For mouse dragging, update the opacity of the original window. For touch
// dragging, just leave that opacity at 1.
if (!is_touch_dragging_) {
window_->layer()->SetOpacity(GetDragWindowOpacity(
window_->GetRootWindow(), window_, /*is_touch_dragging=*/false));
}
for (std::unique_ptr<DragWindowDetails>& details : drag_windows_)
details->Update(window_, is_touch_dragging_, shadow_bounds_);
}
int DragWindowController::GetDragWindowsCountForTest() const {
int count = 0;
for (const std::unique_ptr<DragWindowDetails>& details : drag_windows_) {
if (details->widget_)
count++;
}
return count;
}
const aura::Window* DragWindowController::GetDragWindowForTest(
size_t index) const {
for (const std::unique_ptr<DragWindowDetails>& details : drag_windows_) {
if (details->widget_) {
if (index == 0)
return details->widget_->GetNativeWindow();
index--;
}
}
return nullptr;
}
const ui::Shadow* DragWindowController::GetDragWindowShadowForTest(
size_t index) const {
for (const std::unique_ptr<DragWindowDetails>& details : drag_windows_) {
if (details->widget_) {
if (index == 0)
return details->shadow_.get();
index--;
}
}
return nullptr;
}
void DragWindowController::RequestLayerPaintForTest() {
auto list = base::MakeRefCounted<cc::DisplayItemList>();
ui::PaintContext context(list.get(), 1.0f, gfx::Rect(),
window_->GetHost()->compositor()->is_pixel_canvas());
for (auto& details : drag_windows_) {
std::vector<ui::Layer*> layers;
layers.push_back(details->widget_->GetLayer());
while (layers.size()) {
ui::Layer* layer = layers.back();
layers.pop_back();
if (layer->delegate())
layer->delegate()->OnPaintLayer(context);
for (auto* child : layer->children())
layers.push_back(child);
}
}
}
} // namespace ash