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
|
// Copyright (c) 2013 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 "ui/aura/window_targeter.h"
#include "ui/aura/client/capture_client.h"
#include "ui/aura/client/event_client.h"
#include "ui/aura/client/focus_client.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/aura/window_tree_host.h"
#include "ui/events/event_target.h"
namespace aura {
namespace {
bool IsLocatedEvent(const ui::Event& event) {
return event.IsMouseEvent() || event.IsTouchEvent() ||
event.IsScrollEvent() || event.IsGestureEvent();
}
} // namespace
WindowTargeter::WindowTargeter() {}
WindowTargeter::~WindowTargeter() {}
ui::EventTarget* WindowTargeter::FindTargetForEvent(ui::EventTarget* root,
ui::Event* event) {
Window* window = static_cast<Window*>(root);
Window* target = event->IsKeyEvent() ?
FindTargetForKeyEvent(window, *static_cast<ui::KeyEvent*>(event)) :
static_cast<Window*>(EventTargeter::FindTargetForEvent(root, event));
if (target && !window->parent() && !window->Contains(target)) {
// |window| is the root window, but |target| is not a descendent of
// |window|. So do not allow dispatching from here. Instead, dispatch the
// event through the WindowEventDispatcher that owns |target|.
aura::Window* new_root = target->GetRootWindow();
if (IsLocatedEvent(*event)) {
// The event has been transformed to be in |target|'s coordinate system.
// But dispatching the event through the EventProcessor requires the event
// to be in the host's coordinate system. So, convert the event to be in
// the root's coordinate space, and then to the host's coordinate space by
// applying the host's transform.
ui::LocatedEvent* located_event = static_cast<ui::LocatedEvent*>(event);
located_event->ConvertLocationToTarget(target, new_root);
located_event->UpdateForRootTransform(
new_root->GetHost()->GetRootTransform());
}
ignore_result(
new_root->GetHost()->event_processor()->OnEventFromSource(event));
target = NULL;
}
return target;
}
bool WindowTargeter::SubtreeCanAcceptEvent(
ui::EventTarget* target,
const ui::LocatedEvent& event) const {
aura::Window* window = static_cast<aura::Window*>(target);
if (!window->IsVisible())
return false;
if (window->ignore_events())
return false;
client::EventClient* client = client::GetEventClient(window->GetRootWindow());
if (client && !client->CanProcessEventsWithinSubtree(window))
return false;
Window* parent = window->parent();
if (parent && parent->delegate_ && !parent->delegate_->
ShouldDescendIntoChildForEventHandling(window, event.location())) {
return false;
}
return true;
}
bool WindowTargeter::EventLocationInsideBounds(
ui::EventTarget* target,
const ui::LocatedEvent& event) const {
aura::Window* window = static_cast<aura::Window*>(target);
gfx::Point point = event.location();
if (window->parent())
aura::Window::ConvertPointToTarget(window->parent(), window, &point);
return gfx::Rect(window->bounds().size()).Contains(point);
}
ui::EventTarget* WindowTargeter::FindTargetForLocatedEvent(
ui::EventTarget* root,
ui::LocatedEvent* event) {
Window* window = static_cast<Window*>(root);
if (!window->parent()) {
Window* target = FindTargetInRootWindow(window, *event);
if (target) {
window->ConvertEventToTarget(target, event);
return target;
}
}
return EventTargeter::FindTargetForLocatedEvent(root, event);
}
Window* WindowTargeter::FindTargetForKeyEvent(Window* window,
const ui::KeyEvent& key) {
Window* root_window = window->GetRootWindow();
client::FocusClient* focus_client = client::GetFocusClient(root_window);
Window* focused_window = focus_client->GetFocusedWindow();
if (!focused_window)
return window;
client::EventClient* event_client = client::GetEventClient(root_window);
if (event_client &&
!event_client->CanProcessEventsWithinSubtree(focused_window)) {
focus_client->FocusWindow(NULL);
return NULL;
}
return focused_window ? focused_window : window;
}
Window* WindowTargeter::FindTargetInRootWindow(Window* root_window,
const ui::LocatedEvent& event) {
DCHECK_EQ(root_window, root_window->GetRootWindow());
// Mouse events should be dispatched to the window that processed the
// mouse-press events (if any).
if (event.IsScrollEvent() || event.IsMouseEvent()) {
WindowEventDispatcher* dispatcher = root_window->GetHost()->dispatcher();
if (dispatcher->mouse_pressed_handler())
return dispatcher->mouse_pressed_handler();
}
// All events should be directed towards the capture window (if any).
Window* capture_window = client::GetCaptureWindow(root_window);
if (capture_window)
return capture_window;
if (event.IsTouchEvent()) {
// Query the gesture-recognizer to find targets for touch events.
const ui::TouchEvent& touch = static_cast<const ui::TouchEvent&>(event);
ui::GestureConsumer* consumer =
ui::GestureRecognizer::Get()->GetTouchLockedTarget(touch);
if (consumer)
return static_cast<Window*>(consumer);
consumer =
ui::GestureRecognizer::Get()->GetTargetForLocation(
event.location(), touch.source_device_id());
if (consumer)
return static_cast<Window*>(consumer);
// If the initial touch is outside the root window, target the root.
if (!root_window->bounds().Contains(event.location()))
return root_window;
}
return NULL;
}
} // namespace aura
|
