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// Copyright (c) 2012 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/wm/core/window_modality_controller.h"
#include <algorithm>
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/client/capture_client.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/aura/window_property.h"
#include "ui/base/ui_base_types.h"
#include "ui/events/event.h"
#include "ui/events/event_target.h"
#include "ui/events/gestures/gesture_recognizer.h"
#include "ui/wm/core/window_animations.h"
#include "ui/wm/core/window_util.h"
namespace wm {
// Transient child's modal parent.
extern const aura::WindowProperty<aura::Window*>* const kModalParentKey;
DEFINE_WINDOW_PROPERTY_KEY(aura::Window*, kModalParentKey, NULL);
namespace {
bool HasAncestor(aura::Window* window, aura::Window* ancestor) {
if (!window)
return false;
if (window == ancestor)
return true;
return HasAncestor(window->parent(), ancestor);
}
bool TransientChildIsWindowModal(aura::Window* window) {
return window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_WINDOW;
}
bool TransientChildIsSystemModal(aura::Window* window) {
return window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_SYSTEM;
}
bool TransientChildIsChildModal(aura::Window* window) {
return window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_CHILD;
}
aura::Window* GetModalParent(aura::Window* window) {
return window->GetProperty(kModalParentKey);
}
bool IsModalTransientChild(aura::Window* transient, aura::Window* original) {
return transient->IsVisible() &&
(TransientChildIsWindowModal(transient) ||
TransientChildIsSystemModal(transient) ||
(TransientChildIsChildModal(transient) &&
(HasAncestor(original, GetModalParent(transient)))));
}
aura::Window* GetModalTransientChild(
aura::Window* activatable,
aura::Window* original) {
for (aura::Window::Windows::const_iterator it =
GetTransientChildren(activatable).begin();
it != GetTransientChildren(activatable).end();
++it) {
aura::Window* transient = *it;
if (IsModalTransientChild(transient, original)) {
return GetTransientChildren(transient).empty() ?
transient : GetModalTransientChild(transient, original);
}
}
return NULL;
}
} // namespace
void SetModalParent(aura::Window* child, aura::Window* parent) {
child->SetProperty(kModalParentKey, parent);
}
aura::Window* GetModalTransient(aura::Window* window) {
if (!window)
return NULL;
// We always want to check the for the transient child of the toplevel window.
aura::Window* toplevel = GetToplevelWindow(window);
if (!toplevel)
return NULL;
return GetModalTransientChild(toplevel, window);
}
////////////////////////////////////////////////////////////////////////////////
// WindowModalityController, public:
WindowModalityController::WindowModalityController(
ui::EventTarget* event_target)
: event_target_(event_target) {
aura::Env::GetInstance()->AddObserver(this);
DCHECK(event_target->IsPreTargetListEmpty());
event_target_->AddPreTargetHandler(this);
}
WindowModalityController::~WindowModalityController() {
event_target_->RemovePreTargetHandler(this);
aura::Env::GetInstance()->RemoveObserver(this);
for (size_t i = 0; i < windows_.size(); ++i)
windows_[i]->RemoveObserver(this);
}
////////////////////////////////////////////////////////////////////////////////
// WindowModalityController, aura::EventFilter implementation:
void WindowModalityController::OnKeyEvent(ui::KeyEvent* event) {
aura::Window* target = static_cast<aura::Window*>(event->target());
if (GetModalTransient(target))
event->SetHandled();
}
void WindowModalityController::OnMouseEvent(ui::MouseEvent* event) {
aura::Window* target = static_cast<aura::Window*>(event->target());
if (ProcessLocatedEvent(target, event))
event->SetHandled();
}
void WindowModalityController::OnTouchEvent(ui::TouchEvent* event) {
aura::Window* target = static_cast<aura::Window*>(event->target());
if (ProcessLocatedEvent(target, event))
event->SetHandled();
}
////////////////////////////////////////////////////////////////////////////////
// WindowModalityController, aura::EnvObserver implementation:
void WindowModalityController::OnWindowInitialized(aura::Window* window) {
windows_.push_back(window);
window->AddObserver(this);
}
////////////////////////////////////////////////////////////////////////////////
// WindowModalityController, aura::WindowObserver implementation:
void WindowModalityController::OnWindowPropertyChanged(aura::Window* window,
const void* key,
intptr_t old) {
// In tests, we sometimes create the modality relationship after a window is
// visible.
if (key == aura::client::kModalKey &&
window->GetProperty(aura::client::kModalKey) != ui::MODAL_TYPE_NONE &&
window->IsVisible()) {
ActivateWindow(window);
ui::GestureRecognizer::Get()->CancelActiveTouchesExcept(nullptr);
}
}
void WindowModalityController::OnWindowVisibilityChanged(
aura::Window* window,
bool visible) {
if (visible && window->GetProperty(aura::client::kModalKey) !=
ui::MODAL_TYPE_NONE) {
ui::GestureRecognizer::Get()->CancelActiveTouchesExcept(nullptr);
// Make sure no other window has capture, otherwise |window| won't get mouse
// events.
aura::Window* capture_window = aura::client::GetCaptureWindow(window);
if (capture_window)
capture_window->ReleaseCapture();
}
}
void WindowModalityController::OnWindowDestroyed(aura::Window* window) {
windows_.erase(std::find(windows_.begin(), windows_.end(), window));
window->RemoveObserver(this);
}
bool WindowModalityController::ProcessLocatedEvent(aura::Window* target,
ui::LocatedEvent* event) {
if (event->handled())
return false;
aura::Window* modal_transient_child = GetModalTransient(target);
if (modal_transient_child && (event->type() == ui::ET_MOUSE_PRESSED ||
event->type() == ui::ET_TOUCH_PRESSED)) {
// Activate top window if transient child window is window modal.
if (TransientChildIsWindowModal(modal_transient_child)) {
aura::Window* toplevel = GetToplevelWindow(target);
DCHECK(toplevel);
ActivateWindow(toplevel);
}
AnimateWindow(modal_transient_child, WINDOW_ANIMATION_TYPE_BOUNCE);
}
if (event->type() == ui::ET_TOUCH_CANCELLED)
return false;
return !!modal_transient_child;
}
} // namespace wm
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