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/window_resizer.h"
6
7 #include "ash/screen_ash.h"
8 #include "ash/shell.h"
9 #include "ash/shell_window_ids.h"
10 #include "ash/wm/coordinate_conversion.h"
11 #include "ash/wm/dock/docked_window_layout_manager.h"
12 #include "ash/wm/window_state.h"
13 #include "ash/wm/window_util.h"
14 #include "ui/aura/client/aura_constants.h"
15 #include "ui/aura/root_window.h"
16 #include "ui/aura/window.h"
17 #include "ui/aura/window_delegate.h"
18 #include "ui/base/hit_test.h"
19 #include "ui/base/ui_base_types.h"
20 #include "ui/compositor/scoped_layer_animation_settings.h"
21 #include "ui/gfx/display.h"
22 #include "ui/gfx/screen.h"
23
24 namespace ash {
25
26 namespace {
27
GetPositionChangeDirectionForWindowComponent(int window_component)28 int GetPositionChangeDirectionForWindowComponent(int window_component) {
29 int pos_change_direction = WindowResizer::kBoundsChangeDirection_None;
30 switch (window_component) {
31 case HTTOPLEFT:
32 case HTBOTTOMRIGHT:
33 case HTGROWBOX:
34 case HTCAPTION:
35 pos_change_direction |=
36 WindowResizer::kBoundsChangeDirection_Horizontal |
37 WindowResizer::kBoundsChangeDirection_Vertical;
38 break;
39 case HTTOP:
40 case HTTOPRIGHT:
41 case HTBOTTOM:
42 pos_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
43 break;
44 case HTBOTTOMLEFT:
45 case HTRIGHT:
46 case HTLEFT:
47 pos_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
48 break;
49 default:
50 break;
51 }
52 return pos_change_direction;
53 }
54
GetSizeChangeDirectionForWindowComponent(int window_component)55 int GetSizeChangeDirectionForWindowComponent(int window_component) {
56 int size_change_direction = WindowResizer::kBoundsChangeDirection_None;
57 switch (window_component) {
58 case HTTOPLEFT:
59 case HTTOPRIGHT:
60 case HTBOTTOMLEFT:
61 case HTBOTTOMRIGHT:
62 case HTGROWBOX:
63 case HTCAPTION:
64 size_change_direction |=
65 WindowResizer::kBoundsChangeDirection_Horizontal |
66 WindowResizer::kBoundsChangeDirection_Vertical;
67 break;
68 case HTTOP:
69 case HTBOTTOM:
70 size_change_direction |= WindowResizer::kBoundsChangeDirection_Vertical;
71 break;
72 case HTRIGHT:
73 case HTLEFT:
74 size_change_direction |= WindowResizer::kBoundsChangeDirection_Horizontal;
75 break;
76 default:
77 break;
78 }
79 return size_change_direction;
80 }
81
82 // Returns true for resize components along the right edge, where a drag in
83 // positive x will make the window larger.
IsRightEdge(int window_component)84 bool IsRightEdge(int window_component) {
85 return window_component == HTTOPRIGHT ||
86 window_component == HTRIGHT ||
87 window_component == HTBOTTOMRIGHT ||
88 window_component == HTGROWBOX;
89 }
90
91 } // namespace
92
93 // static
94 const int WindowResizer::kBoundsChange_None = 0;
95 // static
96 const int WindowResizer::kBoundsChange_Repositions = 1;
97 // static
98 const int WindowResizer::kBoundsChange_Resizes = 2;
99
100 // static
101 const int WindowResizer::kBoundsChangeDirection_None = 0;
102 // static
103 const int WindowResizer::kBoundsChangeDirection_Horizontal = 1;
104 // static
105 const int WindowResizer::kBoundsChangeDirection_Vertical = 2;
106
Details()107 WindowResizer::Details::Details()
108 : window(NULL),
109 window_state(NULL),
110 window_component(HTNOWHERE),
111 bounds_change(0),
112 position_change_direction(0),
113 size_change_direction(0),
114 is_resizable(false),
115 source(aura::client::WINDOW_MOVE_SOURCE_MOUSE) {
116 }
117
Details(aura::Window * window,const gfx::Point & location,int window_component,aura::client::WindowMoveSource source)118 WindowResizer::Details::Details(aura::Window* window,
119 const gfx::Point& location,
120 int window_component,
121 aura::client::WindowMoveSource source)
122 : window(window),
123 window_state(wm::GetWindowState(window)),
124 initial_bounds_in_parent(window->bounds()),
125 restore_bounds(gfx::Rect()),
126 initial_location_in_parent(location),
127 initial_opacity(window->layer()->opacity()),
128 window_component(window_component),
129 bounds_change(GetBoundsChangeForWindowComponent(window_component)),
130 position_change_direction(
131 GetPositionChangeDirectionForWindowComponent(window_component)),
132 size_change_direction(
133 GetSizeChangeDirectionForWindowComponent(window_component)),
134 is_resizable(bounds_change != kBoundsChangeDirection_None),
135 source(source) {
136 if (window_state->IsNormalShowState() &&
137 window_state->HasRestoreBounds() &&
138 window_component == HTCAPTION)
139 restore_bounds = window_state->GetRestoreBoundsInScreen();
140 }
141
~Details()142 WindowResizer::Details::~Details() {
143 }
144
WindowResizer()145 WindowResizer::WindowResizer() {
146 }
147
~WindowResizer()148 WindowResizer::~WindowResizer() {
149 }
150
151 // static
GetBoundsChangeForWindowComponent(int component)152 int WindowResizer::GetBoundsChangeForWindowComponent(int component) {
153 int bounds_change = WindowResizer::kBoundsChange_None;
154 switch (component) {
155 case HTTOPLEFT:
156 case HTTOP:
157 case HTTOPRIGHT:
158 case HTLEFT:
159 case HTBOTTOMLEFT:
160 bounds_change |= WindowResizer::kBoundsChange_Repositions |
161 WindowResizer::kBoundsChange_Resizes;
162 break;
163 case HTCAPTION:
164 bounds_change |= WindowResizer::kBoundsChange_Repositions;
165 break;
166 case HTRIGHT:
167 case HTBOTTOMRIGHT:
168 case HTBOTTOM:
169 case HTGROWBOX:
170 bounds_change |= WindowResizer::kBoundsChange_Resizes;
171 break;
172 default:
173 break;
174 }
175 return bounds_change;
176 }
177
178 // static
CalculateBoundsForDrag(const Details & details,const gfx::Point & passed_location)179 gfx::Rect WindowResizer::CalculateBoundsForDrag(
180 const Details& details,
181 const gfx::Point& passed_location) {
182 if (!details.is_resizable)
183 return details.initial_bounds_in_parent;
184
185 gfx::Point location = passed_location;
186 int delta_x = location.x() - details.initial_location_in_parent.x();
187 int delta_y = location.y() - details.initial_location_in_parent.y();
188
189 AdjustDeltaForTouchResize(details, &delta_x, &delta_y);
190
191 // The minimize size constraint may limit how much we change the window
192 // position. For example, dragging the left edge to the right should stop
193 // repositioning the window when the minimize size is reached.
194 gfx::Size size = GetSizeForDrag(details, &delta_x, &delta_y);
195 gfx::Point origin = GetOriginForDrag(details, delta_x, delta_y);
196 gfx::Rect new_bounds(origin, size);
197
198 // Sizing has to keep the result on the screen. Note that this correction
199 // has to come first since it might have an impact on the origin as well as
200 // on the size.
201 if (details.bounds_change & kBoundsChange_Resizes) {
202 gfx::Rect work_area =
203 Shell::GetScreen()->GetDisplayNearestWindow(details.window).work_area();
204 aura::Window* dock_container = Shell::GetContainer(
205 details.window->GetRootWindow(),
206 internal::kShellWindowId_DockedContainer);
207 internal::DockedWindowLayoutManager* dock_layout =
208 static_cast<internal::DockedWindowLayoutManager*>(
209 dock_container->layout_manager());
210
211 work_area.Union(dock_layout->docked_bounds());
212 work_area = ScreenAsh::ConvertRectFromScreen(details.window->parent(),
213 work_area);
214 if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
215 if (IsRightEdge(details.window_component) &&
216 new_bounds.right() < work_area.x() + kMinimumOnScreenArea) {
217 int delta = work_area.x() + kMinimumOnScreenArea - new_bounds.right();
218 new_bounds.set_width(new_bounds.width() + delta);
219 } else if (new_bounds.x() > work_area.right() - kMinimumOnScreenArea) {
220 int width = new_bounds.right() - work_area.right() +
221 kMinimumOnScreenArea;
222 new_bounds.set_x(work_area.right() - kMinimumOnScreenArea);
223 new_bounds.set_width(width);
224 }
225 }
226 if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
227 if (!IsBottomEdge(details.window_component) &&
228 new_bounds.y() > work_area.bottom() - kMinimumOnScreenArea) {
229 int height = new_bounds.bottom() - work_area.bottom() +
230 kMinimumOnScreenArea;
231 new_bounds.set_y(work_area.bottom() - kMinimumOnScreenArea);
232 new_bounds.set_height(height);
233 } else if (details.window_component == HTBOTTOM ||
234 details.window_component == HTBOTTOMRIGHT ||
235 details.window_component == HTBOTTOMLEFT) {
236 // Update bottom edge to stay in the work area when we are resizing
237 // by dragging the bottom edge or corners.
238 if (new_bounds.bottom() > work_area.bottom())
239 new_bounds.Inset(0, 0, 0,
240 new_bounds.bottom() - work_area.bottom());
241 }
242 }
243 if (details.bounds_change & kBoundsChange_Repositions &&
244 new_bounds.y() < 0) {
245 int delta = new_bounds.y();
246 new_bounds.set_y(0);
247 new_bounds.set_height(new_bounds.height() + delta);
248 }
249 }
250
251 if (details.bounds_change & kBoundsChange_Repositions) {
252 // When we might want to reposition a window which is also restored to its
253 // previous size, to keep the cursor within the dragged window.
254 if (!details.restore_bounds.IsEmpty()) {
255 // However - it is not desirable to change the origin if the window would
256 // be still hit by the cursor.
257 if (details.initial_location_in_parent.x() >
258 details.initial_bounds_in_parent.x() + details.restore_bounds.width())
259 new_bounds.set_x(location.x() - details.restore_bounds.width() / 2);
260 }
261
262 // Make sure that |new_bounds| doesn't leave any of the displays. Note that
263 // the |work_area| above isn't good for this check since it is the work area
264 // for the current display but the window can move to a different one.
265 aura::Window* parent = details.window->parent();
266 gfx::Point passed_location_in_screen(passed_location);
267 wm::ConvertPointToScreen(parent, &passed_location_in_screen);
268 gfx::Rect near_passed_location(passed_location_in_screen, gfx::Size());
269 // Use a pointer location (matching the logic in DragWindowResizer) to
270 // calculate the target display after the drag.
271 const gfx::Display& display =
272 Shell::GetScreen()->GetDisplayMatching(near_passed_location);
273 aura::Window* dock_container = Shell::GetContainer(
274 wm::GetRootWindowMatching(near_passed_location),
275 internal::kShellWindowId_DockedContainer);
276 internal::DockedWindowLayoutManager* dock_layout =
277 static_cast<internal::DockedWindowLayoutManager*>(
278 dock_container->layout_manager());
279
280 gfx::Rect screen_work_area = display.work_area();
281 screen_work_area.Union(dock_layout->docked_bounds());
282 screen_work_area.Inset(kMinimumOnScreenArea, 0);
283 gfx::Rect new_bounds_in_screen =
284 ScreenAsh::ConvertRectToScreen(parent, new_bounds);
285 if (!screen_work_area.Intersects(new_bounds_in_screen)) {
286 // Make sure that the x origin does not leave the current display.
287 new_bounds_in_screen.set_x(
288 std::max(screen_work_area.x() - new_bounds.width(),
289 std::min(screen_work_area.right(),
290 new_bounds_in_screen.x())));
291 new_bounds =
292 ScreenAsh::ConvertRectFromScreen(parent, new_bounds_in_screen);
293 }
294 }
295
296 return new_bounds;
297 }
298
299 // static
IsBottomEdge(int window_component)300 bool WindowResizer::IsBottomEdge(int window_component) {
301 return window_component == HTBOTTOMLEFT ||
302 window_component == HTBOTTOM ||
303 window_component == HTBOTTOMRIGHT ||
304 window_component == HTGROWBOX;
305 }
306
307 // static
AdjustDeltaForTouchResize(const Details & details,int * delta_x,int * delta_y)308 void WindowResizer::AdjustDeltaForTouchResize(const Details& details,
309 int* delta_x,
310 int* delta_y) {
311 if (details.source != aura::client::WINDOW_MOVE_SOURCE_TOUCH ||
312 !(details.bounds_change & kBoundsChange_Resizes))
313 return;
314
315 if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
316 if (IsRightEdge(details.window_component)) {
317 *delta_x += details.initial_location_in_parent.x() -
318 details.initial_bounds_in_parent.right();
319 } else {
320 *delta_x += details.initial_location_in_parent.x() -
321 details.initial_bounds_in_parent.x();
322 }
323 }
324 if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
325 if (IsBottomEdge(details.window_component)) {
326 *delta_y += details.initial_location_in_parent.y() -
327 details.initial_bounds_in_parent.bottom();
328 } else {
329 *delta_y += details.initial_location_in_parent.y() -
330 details.initial_bounds_in_parent.y();
331 }
332 }
333 }
334
335 // static
GetOriginForDrag(const Details & details,int delta_x,int delta_y)336 gfx::Point WindowResizer::GetOriginForDrag(const Details& details,
337 int delta_x,
338 int delta_y) {
339 gfx::Point origin = details.initial_bounds_in_parent.origin();
340 if (details.bounds_change & kBoundsChange_Repositions) {
341 int pos_change_direction =
342 GetPositionChangeDirectionForWindowComponent(details.window_component);
343 if (pos_change_direction & kBoundsChangeDirection_Horizontal)
344 origin.Offset(delta_x, 0);
345 if (pos_change_direction & kBoundsChangeDirection_Vertical)
346 origin.Offset(0, delta_y);
347 }
348 return origin;
349 }
350
351 // static
GetSizeForDrag(const Details & details,int * delta_x,int * delta_y)352 gfx::Size WindowResizer::GetSizeForDrag(const Details& details,
353 int* delta_x,
354 int* delta_y) {
355 gfx::Size size = details.initial_bounds_in_parent.size();
356 if (details.bounds_change & kBoundsChange_Resizes) {
357 gfx::Size min_size = details.window->delegate()->GetMinimumSize();
358 size.SetSize(GetWidthForDrag(details, min_size.width(), delta_x),
359 GetHeightForDrag(details, min_size.height(), delta_y));
360 } else if (!details.restore_bounds.IsEmpty()) {
361 size = details.restore_bounds.size();
362 }
363 return size;
364 }
365
366 // static
GetWidthForDrag(const Details & details,int min_width,int * delta_x)367 int WindowResizer::GetWidthForDrag(const Details& details,
368 int min_width,
369 int* delta_x) {
370 int width = details.initial_bounds_in_parent.width();
371 if (details.size_change_direction & kBoundsChangeDirection_Horizontal) {
372 // Along the right edge, positive delta_x increases the window size.
373 int x_multiplier = IsRightEdge(details.window_component) ? 1 : -1;
374 width += x_multiplier * (*delta_x);
375
376 // Ensure we don't shrink past the minimum width and clamp delta_x
377 // for the window origin computation.
378 if (width < min_width) {
379 width = min_width;
380 *delta_x = -x_multiplier * (details.initial_bounds_in_parent.width() -
381 min_width);
382 }
383
384 // And don't let the window go bigger than the display.
385 int max_width = Shell::GetScreen()->GetDisplayNearestWindow(
386 details.window).bounds().width();
387 gfx::Size max_size = details.window->delegate()->GetMaximumSize();
388 if (max_size.width() != 0)
389 max_width = std::min(max_width, max_size.width());
390 if (width > max_width) {
391 width = max_width;
392 *delta_x = -x_multiplier * (details.initial_bounds_in_parent.width() -
393 max_width);
394 }
395 }
396 return width;
397 }
398
399 // static
GetHeightForDrag(const Details & details,int min_height,int * delta_y)400 int WindowResizer::GetHeightForDrag(const Details& details,
401 int min_height,
402 int* delta_y) {
403 int height = details.initial_bounds_in_parent.height();
404 if (details.size_change_direction & kBoundsChangeDirection_Vertical) {
405 // Along the bottom edge, positive delta_y increases the window size.
406 int y_multiplier = IsBottomEdge(details.window_component) ? 1 : -1;
407 height += y_multiplier * (*delta_y);
408
409 // Ensure we don't shrink past the minimum height and clamp delta_y
410 // for the window origin computation.
411 if (height < min_height) {
412 height = min_height;
413 *delta_y = -y_multiplier * (details.initial_bounds_in_parent.height() -
414 min_height);
415 }
416
417 // And don't let the window go bigger than the display.
418 int max_height = Shell::GetScreen()->GetDisplayNearestWindow(
419 details.window).bounds().height();
420 gfx::Size max_size = details.window->delegate()->GetMaximumSize();
421 if (max_size.height() != 0)
422 max_height = std::min(max_height, max_size.height());
423 if (height > max_height) {
424 height = max_height;
425 *delta_y = -y_multiplier * (details.initial_bounds_in_parent.height() -
426 max_height);
427 }
428 }
429 return height;
430 }
431
432 } // namespace aura
433