src/ui/aura/window_targeter.cc

   1 // Copyright (c) 2013 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 "ui/aura/window_targeter.h"
   6
   7 #include "ui/aura/client/capture_client.h"
   8 #include "ui/aura/client/event_client.h"
   9 #include "ui/aura/client/focus_client.h"
  10 #include "ui/aura/window.h"
  11 #include "ui/aura/window_delegate.h"
  12 #include "ui/aura/window_event_dispatcher.h"
  13 #include "ui/aura/window_tree_host.h"
  14 #include "ui/events/event_target.h"
  15
  16 namespace aura {
  17
  18 WindowTargeter::WindowTargeter() {}
  19 WindowTargeter::~WindowTargeter() {}
  20
  21 bool WindowTargeter::WindowCanAcceptEvent(aura::Window* window,
  22                                           const ui::LocatedEvent& event) const {
  23   if (!window->IsVisible())
  24     return false;
  25   if (window->ignore_events())
  26     return false;
  27   client::EventClient* client = client::GetEventClient(window->GetRootWindow());
  28   if (client && !client->CanProcessEventsWithinSubtree(window))
  29     return false;
  30
  31   Window* parent = window->parent();
  32   if (parent && parent->delegate_ && !parent->delegate_->
  33       ShouldDescendIntoChildForEventHandling(window, event.location())) {
  34     return false;
  35   }
  36   return true;
  37 }
  38
  39 bool WindowTargeter::EventLocationInsideBounds(
  40     aura::Window* window, const ui::LocatedEvent& event) const {
  41   gfx::Point point = event.location();
  42   if (window->parent())
  43     aura::Window::ConvertPointToTarget(window->parent(), window, &point);
  44   return gfx::Rect(window->bounds().size()).Contains(point);
  45 }
  46
  47 ui::EventTarget* WindowTargeter::FindTargetForEvent(ui::EventTarget* root,
  48                                                     ui::Event* event) {
  49   Window* window = static_cast<Window*>(root);
  50   Window* target = event->IsKeyEvent() ?
  51       FindTargetForKeyEvent(window, *static_cast<ui::KeyEvent*>(event)) :
  52       static_cast<Window*>(EventTargeter::FindTargetForEvent(root, event));
  53   if (target && !window->parent()) {
  54     // |window| is the root window.
  55     if (!window->Contains(target)) {
  56       // |target| is not a descendent of |window|. So do not allow dispatching
  57       // from here. Instead, dispatch the event through the
  58       // WindowEventDispatcher that owns |target|.
  59       ui::EventDispatchDetails details ALLOW_UNUSED =
  60           target->GetHost()->event_processor()->OnEventFromSource(event);
  61       target = NULL;
  62     }
  63   }
  64   return target;
  65 }
  66
  67 bool WindowTargeter::SubtreeShouldBeExploredForEvent(
  68     ui::EventTarget* root,
  69     const ui::LocatedEvent& event) {
  70   Window* window = static_cast<Window*>(root);
  71   if (!WindowCanAcceptEvent(window, event))
  72     return false;
  73
  74   return EventLocationInsideBounds(window, event);
  75 }
  76
  77 ui::EventTarget* WindowTargeter::FindTargetForLocatedEvent(
  78     ui::EventTarget* root,
  79     ui::LocatedEvent* event) {
  80   Window* window = static_cast<Window*>(root);
  81   if (!window->parent()) {
  82     Window* target = FindTargetInRootWindow(window, *event);
  83     if (target) {
  84       window->ConvertEventToTarget(target, event);
  85       return target;
  86     }
  87   }
  88   return EventTargeter::FindTargetForLocatedEvent(root, event);
  89 }
  90
  91 Window* WindowTargeter::FindTargetForKeyEvent(Window* window,
  92                                               const ui::KeyEvent& key) {
  93   Window* root_window = window->GetRootWindow();
  94   if (key.key_code() == ui::VKEY_UNKNOWN)
  95     return NULL;
  96   client::FocusClient* focus_client = client::GetFocusClient(root_window);
  97   Window* focused_window = focus_client->GetFocusedWindow();
  98   if (!focused_window)
  99     return window;
 100
 101   client::EventClient* event_client = client::GetEventClient(root_window);
 102   if (event_client &&
 103       !event_client->CanProcessEventsWithinSubtree(focused_window)) {
 104     focus_client->FocusWindow(NULL);
 105     return NULL;
 106   }
 107   return focused_window ? focused_window : window;
 108 }
 109
 110 Window* WindowTargeter::FindTargetInRootWindow(Window* root_window,
 111                                                const ui::LocatedEvent& event) {
 112   DCHECK_EQ(root_window, root_window->GetRootWindow());
 113
 114   // Mouse events should be dispatched to the window that processed the
 115   // mouse-press events (if any).
 116   if (event.IsScrollEvent() || event.IsMouseEvent()) {
 117     WindowEventDispatcher* dispatcher = root_window->GetHost()->dispatcher();
 118     if (dispatcher->mouse_pressed_handler())
 119       return dispatcher->mouse_pressed_handler();
 120   }
 121
 122   // All events should be directed towards the capture window (if any).
 123   Window* capture_window = client::GetCaptureWindow(root_window);
 124   if (capture_window)
 125     return capture_window;
 126
 127   if (event.IsTouchEvent()) {
 128     // Query the gesture-recognizer to find targets for touch events.
 129     const ui::TouchEvent& touch = static_cast<const ui::TouchEvent&>(event);
 130     ui::GestureConsumer* consumer =
 131         ui::GestureRecognizer::Get()->GetTouchLockedTarget(touch);
 132     if (consumer)
 133       return static_cast<Window*>(consumer);
 134     consumer =
 135         ui::GestureRecognizer::Get()->GetTargetForLocation(
 136             event.location(), touch.source_device_id());
 137     if (consumer)
 138       return static_cast<Window*>(consumer);
 139
 140     // If the initial touch is outside the root window, target the root.
 141     if (!root_window->bounds().Contains(event.location()))
 142       return root_window;
 143   }
 144
 145   return NULL;
 146 }
 147
 148 }  // namespace aura