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// 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"
#include "ui/events/event_target_iterator.h"
namespace aura {
WindowTargeter::WindowTargeter() {}
WindowTargeter::~WindowTargeter() {}
Window* WindowTargeter::FindTargetForLocatedEvent(Window* window,
ui::LocatedEvent* event) {
if (!window->parent()) {
Window* target = FindTargetInRootWindow(window, *event);
if (target) {
window->ConvertEventToTarget(target, event);
return target;
}
}
return FindTargetForLocatedEventRecursively(window, event);
}
bool WindowTargeter::SubtreeCanAcceptEvent(
Window* window,
const ui::LocatedEvent& event) const {
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(
Window* window,
const ui::LocatedEvent& event) const {
gfx::Point point = event.location();
if (window->parent())
Window::ConvertPointToTarget(window->parent(), window, &point);
return gfx::Rect(window->bounds().size()).Contains(point);
}
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))
: FindTargetForNonKeyEvent(window, 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|.
Window* new_root = target->GetRootWindow();
if (event->IsLocatedEvent()) {
// 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 = nullptr;
}
return target;
}
ui::EventTarget* WindowTargeter::FindNextBestTarget(
ui::EventTarget* previous_target,
ui::Event* event) {
return nullptr;
}
bool WindowTargeter::SubtreeShouldBeExploredForEvent(
Window* window,
const ui::LocatedEvent& event) {
return SubtreeCanAcceptEvent(window, event) &&
EventLocationInsideBounds(window, 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(nullptr);
return nullptr;
}
return focused_window ? focused_window : window;
}
Window* WindowTargeter::FindTargetForNonKeyEvent(Window* root_window,
ui::Event* event) {
if (!event->IsLocatedEvent())
return root_window;
return FindTargetForLocatedEvent(root_window,
static_cast<ui::LocatedEvent*>(event));
}
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 nullptr;
}
Window* WindowTargeter::FindTargetForLocatedEventRecursively(
Window* root_window,
ui::LocatedEvent* event) {
scoped_ptr<ui::EventTargetIterator> iter = root_window->GetChildIterator();
if (iter) {
ui::EventTarget* target = root_window;
for (ui::EventTarget* child = iter->GetNextTarget(); child;
child = iter->GetNextTarget()) {
WindowTargeter* targeter =
static_cast<WindowTargeter*>(child->GetEventTargeter());
if (!targeter)
targeter = this;
if (!targeter->SubtreeShouldBeExploredForEvent(
static_cast<Window*>(child), *event)) {
continue;
}
target->ConvertEventToTarget(child, event);
target = child;
Window* child_target_window =
static_cast<Window*>(targeter->FindTargetForEvent(child, event));
if (child_target_window)
return child_target_window;
}
target->ConvertEventToTarget(root_window, event);
}
return root_window->CanAcceptEvent(*event) ? root_window : nullptr;
}
} // namespace aura
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