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// Copyright 2012 The Chromium Authors
// 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 <stddef.h>
#include <algorithm>
#include <queue>
#include <string_view>
#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/base/class_property.h"
#include "ui/base/mojom/ui_base_types.mojom-shared.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 {
namespace {
bool HasAncestor(const aura::Window* window, const aura::Window* ancestor) {
return ancestor && ancestor->Contains(window);
}
bool TransientChildIsWindowModal(const aura::Window* window) {
return window->GetProperty(aura::client::kModalKey) ==
ui::mojom::ModalType::kWindow;
}
bool TransientChildIsSystemModal(const aura::Window* window) {
return window->GetProperty(aura::client::kModalKey) ==
ui::mojom::ModalType::kSystem;
}
bool TransientChildIsChildModal(const aura::Window* window) {
return window->GetProperty(aura::client::kModalKey) ==
ui::mojom::ModalType::kChild;
}
aura::Window* GetModalParent(const aura::Window* window) {
return window->GetProperty(aura::client::kChildModalParentKey);
}
bool IsModalTransientChild(const aura::Window* transient,
const aura::Window* original) {
return transient->IsVisible() &&
(TransientChildIsWindowModal(transient) ||
TransientChildIsSystemModal(transient) ||
(TransientChildIsChildModal(transient) &&
HasAncestor(original, GetModalParent(transient))));
}
const aura::Window* GetModalTransientChild(const aura::Window* activatable,
const aura::Window* original) {
for (const aura::Window* transient : GetTransientChildren(activatable)) {
if (IsModalTransientChild(transient, original)) {
if (GetTransientChildren(transient).empty())
return transient;
const aura::Window* modal_child =
GetModalTransientChild(transient, original);
return modal_child ? modal_child : transient;
}
}
return nullptr;
}
} // namespace
void SetModalParent(aura::Window* child, aura::Window* parent) {
child->SetProperty(aura::client::kChildModalParentKey, parent);
}
aura::Window* GetModalTransient(aura::Window* window) {
return const_cast<aura::Window*>(
GetModalTransient(const_cast<const aura::Window*>(window)));
}
const aura::Window* GetModalTransient(const aura::Window* window) {
if (!window)
return nullptr;
// We always want to check for the transient child of the toplevel window.
const aura::Window* toplevel = GetToplevelWindow(window);
if (!toplevel)
return nullptr;
return GetModalTransientChild(toplevel, window);
}
////////////////////////////////////////////////////////////////////////////////
// WindowModalityController, public:
WindowModalityController::WindowModalityController(
ui::EventTarget* event_target,
aura::Env* env)
: env_(env ? env : aura::Env::GetInstance()), event_target_(event_target) {
env_->AddObserver(this);
DCHECK(event_target->IsPreTargetListEmpty());
event_target_->AddPreTargetHandler(this);
}
WindowModalityController::~WindowModalityController() {
event_target_->RemovePreTargetHandler(this);
env_->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();
}
std::string_view WindowModalityController::GetLogContext() const {
return "WindowModalityController";
}
////////////////////////////////////////////////////////////////////////////////
// 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::mojom::ModalType::kNone &&
window->IsVisible()) {
ActivateWindow(window);
CancelTouchesOnTransientWindowTree(window);
}
}
void WindowModalityController::OnWindowVisibilityChanged(aura::Window* window,
bool visible) {
if (visible && window->GetProperty(aura::client::kModalKey) !=
ui::mojom::ModalType::kNone) {
CancelTouchesOnTransientWindowTree(window);
// 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) {
bool should_release_capture = true;
if (window->GetProperty(aura::client::kModalKey) ==
ui::mojom::ModalType::kChild &&
!HasAncestor(capture_window, GetModalParent(window))) {
// For child modal windows we only need ensure capture is not on a
// descendant of the modal parent. This way we block events to the
// parents subtree appropriately.
should_release_capture = false;
}
if (should_release_capture)
capture_window->ReleaseCapture();
}
}
}
void WindowModalityController::OnWindowDestroyed(aura::Window* window) {
windows_.erase(std::ranges::find(windows_, 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::EventType::kMousePressed ||
event->type() == ui::EventType::kTouchPressed)) {
// 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::EventType::kTouchCancelled) {
return false;
}
return !!modal_transient_child;
}
void WindowModalityController::CancelTouchesOnTransientWindowTree(
aura::Window* window) {
// Find the top level transient window.
aura::Window* top_level_window = window;
while (wm::GetTransientParent(top_level_window))
top_level_window = wm::GetTransientParent(top_level_window);
// BFS to get all transient windows in the tree rooted to the top level
// transient window.
std::vector<ui::GestureConsumer*> blocked_consumers;
std::queue<aura::Window*> que;
que.emplace(top_level_window);
while (!que.empty()) {
aura::Window* parent = que.front();
que.pop();
blocked_consumers.emplace_back(parent);
for (aura::Window* w : wm::GetTransientChildren(parent)) {
que.emplace(w);
}
}
// Cancel touches on all the transient windows.
env_->gesture_recognizer()->CancelActiveTouchesOn(blocked_consumers);
}
} // namespace wm
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