1 // Copyright (c) 2012 The Chromium 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 "ash/wm/drag_window_resizer.h"
6
7 #include "ash/display/mouse_cursor_event_filter.h"
8 #include "ash/screen_util.h"
9 #include "ash/shell.h"
10 #include "ash/wm/coordinate_conversion.h"
11 #include "ash/wm/drag_window_controller.h"
12 #include "ash/wm/window_state.h"
13 #include "ash/wm/window_util.h"
14 #include "base/memory/weak_ptr.h"
15 #include "ui/aura/client/aura_constants.h"
16 #include "ui/aura/env.h"
17 #include "ui/aura/window.h"
18 #include "ui/aura/window_delegate.h"
19 #include "ui/aura/window_event_dispatcher.h"
20 #include "ui/base/hit_test.h"
21 #include "ui/base/ui_base_types.h"
22 #include "ui/gfx/screen.h"
23 #include "ui/wm/core/window_util.h"
24
25 namespace ash {
26 namespace {
27
28 // The maximum opacity of the drag phantom window.
29 const float kMaxOpacity = 0.8f;
30
31 // Returns true if Ash has more than one root window.
HasSecondaryRootWindow()32 bool HasSecondaryRootWindow() {
33 return Shell::GetAllRootWindows().size() > 1;
34 }
35
36 // When there are two root windows, returns one of the root windows which is not
37 // |root_window|. Returns NULL if only one root window exists.
GetAnotherRootWindow(aura::Window * root_window)38 aura::Window* GetAnotherRootWindow(aura::Window* root_window) {
39 aura::Window::Windows root_windows = Shell::GetAllRootWindows();
40 if (root_windows.size() < 2)
41 return NULL;
42 DCHECK_EQ(2U, root_windows.size());
43 if (root_windows[0] == root_window)
44 return root_windows[1];
45 return root_windows[0];
46 }
47
48 } // namespace
49
50 // static
51 DragWindowResizer* DragWindowResizer::instance_ = NULL;
52
~DragWindowResizer()53 DragWindowResizer::~DragWindowResizer() {
54 if (window_state_)
55 window_state_->DeleteDragDetails();
56 Shell* shell = Shell::GetInstance();
57 shell->mouse_cursor_filter()->set_mouse_warp_mode(
58 MouseCursorEventFilter::WARP_ALWAYS);
59 shell->mouse_cursor_filter()->HideSharedEdgeIndicator();
60 if (instance_ == this)
61 instance_ = NULL;
62 }
63
64 // static
Create(WindowResizer * next_window_resizer,wm::WindowState * window_state)65 DragWindowResizer* DragWindowResizer::Create(
66 WindowResizer* next_window_resizer,
67 wm::WindowState* window_state) {
68 return new DragWindowResizer(next_window_resizer, window_state);
69 }
70
Drag(const gfx::Point & location,int event_flags)71 void DragWindowResizer::Drag(const gfx::Point& location, int event_flags) {
72 base::WeakPtr<DragWindowResizer> resizer(weak_ptr_factory_.GetWeakPtr());
73 next_window_resizer_->Drag(location, event_flags);
74
75 if (!resizer)
76 return;
77
78 last_mouse_location_ = location;
79 // Show a phantom window for dragging in another root window.
80 if (HasSecondaryRootWindow()) {
81 gfx::Point location_in_screen = location;
82 wm::ConvertPointToScreen(GetTarget()->parent(), &location_in_screen);
83 const bool in_original_root =
84 wm::GetRootWindowAt(location_in_screen) == GetTarget()->GetRootWindow();
85 UpdateDragWindow(GetTarget()->bounds(), in_original_root);
86 } else {
87 drag_window_controller_.reset();
88 }
89 }
90
CompleteDrag()91 void DragWindowResizer::CompleteDrag() {
92 next_window_resizer_->CompleteDrag();
93
94 GetTarget()->layer()->SetOpacity(details().initial_opacity);
95 drag_window_controller_.reset();
96
97 // Check if the destination is another display.
98 gfx::Point last_mouse_location_in_screen = last_mouse_location_;
99 wm::ConvertPointToScreen(GetTarget()->parent(),
100 &last_mouse_location_in_screen);
101 gfx::Screen* screen = Shell::GetScreen();
102 const gfx::Display dst_display =
103 screen->GetDisplayNearestPoint(last_mouse_location_in_screen);
104
105 if (dst_display.id() !=
106 screen->GetDisplayNearestWindow(GetTarget()->GetRootWindow()).id()) {
107 // Adjust the size and position so that it doesn't exceed the size of
108 // work area.
109 const gfx::Size& size = dst_display.work_area().size();
110 gfx::Rect bounds = GetTarget()->bounds();
111 if (bounds.width() > size.width()) {
112 int diff = bounds.width() - size.width();
113 bounds.set_x(bounds.x() + diff / 2);
114 bounds.set_width(size.width());
115 }
116 if (bounds.height() > size.height())
117 bounds.set_height(size.height());
118
119 gfx::Rect dst_bounds =
120 ScreenUtil::ConvertRectToScreen(GetTarget()->parent(), bounds);
121
122 // Adjust the position so that the cursor is on the window.
123 if (!dst_bounds.Contains(last_mouse_location_in_screen)) {
124 if (last_mouse_location_in_screen.x() < dst_bounds.x())
125 dst_bounds.set_x(last_mouse_location_in_screen.x());
126 else if (last_mouse_location_in_screen.x() > dst_bounds.right())
127 dst_bounds.set_x(
128 last_mouse_location_in_screen.x() - dst_bounds.width());
129 }
130 ash::wm::AdjustBoundsToEnsureMinimumWindowVisibility(
131 dst_display.bounds(), &dst_bounds);
132
133 GetTarget()->SetBoundsInScreen(dst_bounds, dst_display);
134 }
135 }
136
RevertDrag()137 void DragWindowResizer::RevertDrag() {
138 next_window_resizer_->RevertDrag();
139
140 drag_window_controller_.reset();
141 GetTarget()->layer()->SetOpacity(details().initial_opacity);
142 }
143
DragWindowResizer(WindowResizer * next_window_resizer,wm::WindowState * window_state)144 DragWindowResizer::DragWindowResizer(WindowResizer* next_window_resizer,
145 wm::WindowState* window_state)
146 : WindowResizer(window_state),
147 next_window_resizer_(next_window_resizer),
148 weak_ptr_factory_(this) {
149 // The pointer should be confined in one display during resizing a window
150 // because the window cannot span two displays at the same time anyway. The
151 // exception is window/tab dragging operation. During that operation,
152 // |mouse_warp_mode_| should be set to WARP_DRAG so that the user could move a
153 // window/tab to another display.
154 MouseCursorEventFilter* mouse_cursor_filter =
155 Shell::GetInstance()->mouse_cursor_filter();
156 mouse_cursor_filter->set_mouse_warp_mode(
157 ShouldAllowMouseWarp() ?
158 MouseCursorEventFilter::WARP_DRAG : MouseCursorEventFilter::WARP_NONE);
159 if (ShouldAllowMouseWarp())
160 mouse_cursor_filter->ShowSharedEdgeIndicator(GetTarget()->GetRootWindow());
161 instance_ = this;
162 }
163
UpdateDragWindow(const gfx::Rect & bounds,bool in_original_root)164 void DragWindowResizer::UpdateDragWindow(const gfx::Rect& bounds,
165 bool in_original_root) {
166 if (details().window_component != HTCAPTION || !ShouldAllowMouseWarp())
167 return;
168
169 // It's available. Show a phantom window on the display if needed.
170 aura::Window* another_root =
171 GetAnotherRootWindow(GetTarget()->GetRootWindow());
172 const gfx::Rect root_bounds_in_screen(another_root->GetBoundsInScreen());
173 const gfx::Rect bounds_in_screen =
174 ScreenUtil::ConvertRectToScreen(GetTarget()->parent(), bounds);
175 gfx::Rect bounds_in_another_root =
176 gfx::IntersectRects(root_bounds_in_screen, bounds_in_screen);
177 const float fraction_in_another_window =
178 (bounds_in_another_root.width() * bounds_in_another_root.height()) /
179 static_cast<float>(bounds.width() * bounds.height());
180
181 if (fraction_in_another_window > 0) {
182 if (!drag_window_controller_) {
183 drag_window_controller_.reset(
184 new DragWindowController(GetTarget()));
185 // Always show the drag phantom on the |another_root| window.
186 drag_window_controller_->SetDestinationDisplay(
187 Shell::GetScreen()->GetDisplayNearestWindow(another_root));
188 drag_window_controller_->Show();
189 } else {
190 // No animation.
191 drag_window_controller_->SetBounds(bounds_in_screen);
192 }
193 const float phantom_opacity =
194 !in_original_root ? 1 : (kMaxOpacity * fraction_in_another_window);
195 const float window_opacity =
196 in_original_root ? 1 : (kMaxOpacity * (1 - fraction_in_another_window));
197 drag_window_controller_->SetOpacity(phantom_opacity);
198 GetTarget()->layer()->SetOpacity(window_opacity);
199 } else {
200 drag_window_controller_.reset();
201 GetTarget()->layer()->SetOpacity(1.0f);
202 }
203 }
204
ShouldAllowMouseWarp()205 bool DragWindowResizer::ShouldAllowMouseWarp() {
206 return (details().window_component == HTCAPTION) &&
207 !::wm::GetTransientParent(GetTarget()) &&
208 (GetTarget()->type() == ui::wm::WINDOW_TYPE_NORMAL ||
209 GetTarget()->type() == ui::wm::WINDOW_TYPE_PANEL);
210 }
211
212 } // namespace ash
213