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.
5 #include "ash/display/mouse_cursor_event_filter.h"
7 #include "ash/display/cursor_window_controller.h"
8 #include "ash/display/display_controller.h"
9 #include "ash/display/display_manager.h"
10 #include "ash/display/shared_display_edge_indicator.h"
11 #include "ash/root_window_controller.h"
12 #include "ash/screen_util.h"
13 #include "ash/shell.h"
14 #include "ash/wm/coordinate_conversion.h"
15 #include "ash/wm/window_util.h"
16 #include "ui/aura/env.h"
17 #include "ui/aura/window.h"
18 #include "ui/aura/window_event_dispatcher.h"
19 #include "ui/base/layout.h"
20 #include "ui/compositor/dip_util.h"
21 #include "ui/events/event.h"
22 #include "ui/gfx/screen.h"
27 // Maximum size on the display edge that initiate snapping phantom window,
28 // from the corner of the display.
29 const int kMaximumSnapHeight = 16;
31 // Minimum height of an indicator on the display edge that allows
32 // dragging a window. If two displays shares the edge smaller than
33 // this, entire edge will be used as a draggable space.
34 const int kMinimumIndicatorHeight = 200;
36 const int kIndicatorThickness = 1;
39 MouseCursorEventFilter::MouseCursorEventFilter()
40 : mouse_warp_mode_(WARP_ALWAYS),
41 was_mouse_warped_(false),
42 drag_source_root_(NULL),
43 scale_when_drag_started_(1.0f),
44 shared_display_edge_indicator_(new SharedDisplayEdgeIndicator) {
47 MouseCursorEventFilter::~MouseCursorEventFilter() {
48 HideSharedEdgeIndicator();
51 void MouseCursorEventFilter::ShowSharedEdgeIndicator(
52 const aura::Window* from) {
53 HideSharedEdgeIndicator();
54 if (Shell::GetScreen()->GetNumDisplays() <= 1 || from == NULL) {
55 src_indicator_bounds_.SetRect(0, 0, 0, 0);
56 dst_indicator_bounds_.SetRect(0, 0, 0, 0);
57 drag_source_root_ = NULL;
60 drag_source_root_ = from;
62 DisplayLayout::Position position = Shell::GetInstance()->
63 display_manager()->GetCurrentDisplayLayout().position;
64 if (position == DisplayLayout::TOP || position == DisplayLayout::BOTTOM)
65 UpdateHorizontalIndicatorWindowBounds();
67 UpdateVerticalIndicatorWindowBounds();
69 shared_display_edge_indicator_->Show(src_indicator_bounds_,
70 dst_indicator_bounds_);
73 void MouseCursorEventFilter::HideSharedEdgeIndicator() {
74 shared_display_edge_indicator_->Hide();
77 void MouseCursorEventFilter::OnMouseEvent(ui::MouseEvent* event) {
78 aura::Window* target = static_cast<aura::Window*>(event->target());
79 RootWindowController* rwc = GetRootWindowController(target->GetRootWindow());
80 // The root window controller is removed during the shutting down
81 // RootWindow, so don't process events futher.
83 event->StopPropagation();
87 if (event->type() == ui::ET_MOUSE_PRESSED) {
88 scale_when_drag_started_ = ui::GetDeviceScaleFactor(target->layer());
89 } else if (event->type() == ui::ET_MOUSE_RELEASED) {
90 scale_when_drag_started_ = 1.0f;
93 // Handle both MOVED and DRAGGED events here because when the mouse pointer
94 // enters the other root window while dragging, the underlying window system
95 // (at least X11) stops generating a ui::ET_MOUSE_MOVED event.
96 if (event->type() != ui::ET_MOUSE_MOVED &&
97 event->type() != ui::ET_MOUSE_DRAGGED) {
101 Shell::GetInstance()->display_controller()->
102 cursor_window_controller()->UpdateLocation();
104 gfx::Point point_in_screen(event->location());
105 wm::ConvertPointToScreen(target, &point_in_screen);
106 if (WarpMouseCursorIfNecessary(target->GetRootWindow(), point_in_screen))
107 event->StopPropagation();
110 bool MouseCursorEventFilter::WarpMouseCursorIfNecessary(
111 aura::Window* target_root,
112 const gfx::Point& point_in_screen) {
113 if (Shell::GetScreen()->GetNumDisplays() <= 1 ||
114 mouse_warp_mode_ == WARP_NONE)
117 // Do not warp again right after the cursor was warped. Sometimes the offset
118 // is not long enough and the cursor moves at the edge of the destination
119 // display. See crbug.com/278885
120 // TODO(mukai): simplify the offset calculation below, it would not be
121 // necessary anymore with this flag.
122 if (was_mouse_warped_) {
123 was_mouse_warped_ = false;
127 aura::Window* root_at_point = wm::GetRootWindowAt(point_in_screen);
128 gfx::Point point_in_root = point_in_screen;
129 wm::ConvertPointFromScreen(root_at_point, &point_in_root);
130 gfx::Rect root_bounds = root_at_point->bounds();
134 // If the window is dragged between 2x display and 1x display,
135 // staring from 2x display, pointer location is rounded by the
136 // source scale factor (2x) so it will never reach the edge (which
137 // is odd). Shrink by scale factor of the display where the dragging
138 // started instead. Only integral scale factor is supported for now.
139 int shrink = scale_when_drag_started_;
140 // Make the bounds inclusive to detect the edge.
141 root_bounds.Inset(0, 0, shrink, shrink);
142 gfx::Rect src_indicator_bounds = src_indicator_bounds_;
143 src_indicator_bounds.Inset(-shrink, -shrink, -shrink, -shrink);
145 if (point_in_root.x() <= root_bounds.x()) {
146 // Use -2, not -1, to avoid infinite loop of pointer warp.
147 offset_x = -2 * scale_when_drag_started_;
148 } else if (point_in_root.x() >= root_bounds.right()) {
149 offset_x = 2 * scale_when_drag_started_;
150 } else if (point_in_root.y() <= root_bounds.y()) {
151 offset_y = -2 * scale_when_drag_started_;
152 } else if (point_in_root.y() >= root_bounds.bottom()) {
153 offset_y = 2 * scale_when_drag_started_;
158 gfx::Point point_in_dst_screen(point_in_screen);
159 point_in_dst_screen.Offset(offset_x, offset_y);
160 aura::Window* dst_root = wm::GetRootWindowAt(point_in_dst_screen);
162 // Warp the mouse cursor only if the location is in the indicator bounds
163 // or the mouse pointer is in the destination root.
164 if (mouse_warp_mode_ == WARP_DRAG &&
165 dst_root != drag_source_root_ &&
166 !src_indicator_bounds.Contains(point_in_screen)) {
170 wm::ConvertPointFromScreen(dst_root, &point_in_dst_screen);
172 if (dst_root->bounds().Contains(point_in_dst_screen)) {
173 DCHECK_NE(dst_root, root_at_point);
174 was_mouse_warped_ = true;
175 dst_root->MoveCursorTo(point_in_dst_screen);
181 void MouseCursorEventFilter::UpdateHorizontalIndicatorWindowBounds() {
182 bool from_primary = Shell::GetPrimaryRootWindow() == drag_source_root_;
183 // GetPrimaryDisplay returns an object on stack, so copy the bounds
184 // instead of using reference.
185 const gfx::Rect primary_bounds =
186 Shell::GetScreen()->GetPrimaryDisplay().bounds();
187 const gfx::Rect secondary_bounds = ScreenUtil::GetSecondaryDisplay().bounds();
188 DisplayLayout::Position position = Shell::GetInstance()->
189 display_manager()->GetCurrentDisplayLayout().position;
191 src_indicator_bounds_.set_x(
192 std::max(primary_bounds.x(), secondary_bounds.x()));
193 src_indicator_bounds_.set_width(
194 std::min(primary_bounds.right(), secondary_bounds.right()) -
195 src_indicator_bounds_.x());
196 src_indicator_bounds_.set_height(kIndicatorThickness);
197 src_indicator_bounds_.set_y(
198 position == DisplayLayout::TOP ?
199 primary_bounds.y() - (from_primary ? 0 : kIndicatorThickness) :
200 primary_bounds.bottom() - (from_primary ? kIndicatorThickness : 0));
202 dst_indicator_bounds_ = src_indicator_bounds_;
203 dst_indicator_bounds_.set_height(kIndicatorThickness);
204 dst_indicator_bounds_.set_y(
205 position == DisplayLayout::TOP ?
206 primary_bounds.y() - (from_primary ? kIndicatorThickness : 0) :
207 primary_bounds.bottom() - (from_primary ? 0 : kIndicatorThickness));
210 void MouseCursorEventFilter::UpdateVerticalIndicatorWindowBounds() {
211 bool in_primary = Shell::GetPrimaryRootWindow() == drag_source_root_;
212 // GetPrimaryDisplay returns an object on stack, so copy the bounds
213 // instead of using reference.
214 const gfx::Rect primary_bounds =
215 Shell::GetScreen()->GetPrimaryDisplay().bounds();
216 const gfx::Rect secondary_bounds = ScreenUtil::GetSecondaryDisplay().bounds();
217 DisplayLayout::Position position = Shell::GetInstance()->
218 display_manager()->GetCurrentDisplayLayout().position;
220 int upper_shared_y = std::max(primary_bounds.y(), secondary_bounds.y());
221 int lower_shared_y = std::min(primary_bounds.bottom(),
222 secondary_bounds.bottom());
223 int shared_height = lower_shared_y - upper_shared_y;
225 int dst_x = position == DisplayLayout::LEFT ?
226 primary_bounds.x() - (in_primary ? kIndicatorThickness : 0) :
227 primary_bounds.right() - (in_primary ? 0 : kIndicatorThickness);
228 dst_indicator_bounds_.SetRect(
229 dst_x, upper_shared_y, kIndicatorThickness, shared_height);
231 // The indicator on the source display.
232 src_indicator_bounds_.set_width(kIndicatorThickness);
233 src_indicator_bounds_.set_x(
234 position == DisplayLayout::LEFT ?
235 primary_bounds.x() - (in_primary ? 0 : kIndicatorThickness) :
236 primary_bounds.right() - (in_primary ? kIndicatorThickness : 0));
238 const gfx::Rect& source_bounds =
239 in_primary ? primary_bounds : secondary_bounds;
240 int upper_indicator_y = source_bounds.y() + kMaximumSnapHeight;
241 int lower_indicator_y = std::min(source_bounds.bottom(), lower_shared_y);
243 // This gives a hight that can be used without sacrifying the snap space.
244 int available_space = lower_indicator_y -
245 std::max(upper_shared_y, upper_indicator_y);
247 if (shared_height < kMinimumIndicatorHeight) {
248 // If the shared height is smaller than minimum height, use the
250 upper_indicator_y = upper_shared_y;
251 } else if (available_space < kMinimumIndicatorHeight) {
252 // Snap to the bottom.
254 std::max(upper_shared_y, lower_indicator_y + kMinimumIndicatorHeight);
256 upper_indicator_y = std::max(upper_indicator_y, upper_shared_y);
258 src_indicator_bounds_.set_y(upper_indicator_y);
259 src_indicator_bounds_.set_height(lower_indicator_y - upper_indicator_y);