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// Copyright 2014 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 "ash/wm/maximize_mode/maximize_mode_window_manager.h"
#include "ash/ash_switches.h"
#include "ash/root_window_controller.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/maximize_mode/maximize_mode_window_state.h"
#include "ash/wm/maximize_mode/workspace_backdrop_delegate.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/overview/window_selector_controller.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_util.h"
#include "ash/wm/wm_event.h"
#include "ash/wm/workspace_controller.h"
#include "base/command_line.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/window.h"
#include "ui/gfx/screen.h"
namespace ash {
namespace {
// The height of the area in which a touch operation leads to exiting the
// full screen mode.
const int kLeaveFullScreenAreaHeightInPixel = 2;
// Exits overview mode if it is currently active.
void CancelOverview() {
WindowSelectorController* controller =
Shell::GetInstance()->window_selector_controller();
if (controller && controller->IsSelecting())
controller->OnSelectionEnded();
}
} // namespace
MaximizeModeWindowManager::~MaximizeModeWindowManager() {
// Overview mode needs to be ended before exiting maximize mode to prevent
// transforming windows which are currently in
// overview: http://crbug.com/366605
CancelOverview();
Shell::GetInstance()->RemovePreTargetHandler(this);
Shell::GetInstance()->RemoveShellObserver(this);
gfx::Screen::GetScreen()->RemoveObserver(this);
EnableBackdropBehindTopWindowOnEachDisplay(false);
RemoveWindowCreationObservers();
RestoreAllWindows();
}
int MaximizeModeWindowManager::GetNumberOfManagedWindows() {
return window_state_map_.size();
}
void MaximizeModeWindowManager::AddWindow(aura::Window* window) {
// Only add the window if it is a direct dependent of a container window
// and not yet tracked.
if (!ShouldHandleWindow(window) ||
window_state_map_.find(window) != window_state_map_.end() ||
!IsContainerWindow(window->parent())) {
return;
}
MaximizeAndTrackWindow(window);
}
void MaximizeModeWindowManager::WindowStateDestroyed(aura::Window* window) {
// At this time ForgetWindow() should already have been called. If not,
// someone else must have replaced the "window manager's state object".
DCHECK(!window->HasObserver(this));
WindowToState::iterator it = window_state_map_.find(window);
DCHECK(it != window_state_map_.end());
window_state_map_.erase(it);
}
void MaximizeModeWindowManager::OnOverviewModeStarting() {
if (backdrops_hidden_)
return;
EnableBackdropBehindTopWindowOnEachDisplay(false);
SetDeferBoundsUpdates(true);
backdrops_hidden_ = true;
}
void MaximizeModeWindowManager::OnOverviewModeEnded() {
if (!backdrops_hidden_)
return;
backdrops_hidden_ = false;
EnableBackdropBehindTopWindowOnEachDisplay(true);
SetDeferBoundsUpdates(false);
}
void MaximizeModeWindowManager::OnWindowDestroying(aura::Window* window) {
if (IsContainerWindow(window)) {
// container window can be removed on display destruction.
window->RemoveObserver(this);
observed_container_windows_.erase(window);
} else {
// If a known window gets destroyed we need to remove all knowledge about
// it.
ForgetWindow(window);
}
}
void MaximizeModeWindowManager::OnWindowAdded(aura::Window* window) {
// A window can get removed and then re-added by a drag and drop operation.
if (IsContainerWindow(window->parent()) &&
window_state_map_.find(window) == window_state_map_.end()) {
MaximizeAndTrackWindow(window);
// When the state got added, the "WM_EVENT_ADDED_TO_WORKSPACE" event got
// already sent and we have to notify our state again.
if (window_state_map_.find(window) != window_state_map_.end()) {
wm::WMEvent event(wm::WM_EVENT_ADDED_TO_WORKSPACE);
wm::GetWindowState(window)->OnWMEvent(&event);
}
}
}
void MaximizeModeWindowManager::OnWindowPropertyChanged(aura::Window* window,
const void* key,
intptr_t old) {
// Stop managing |window| if the always-on-top property is added.
if (key == aura::client::kAlwaysOnTopKey &&
window->GetProperty(aura::client::kAlwaysOnTopKey)) {
ForgetWindow(window);
}
}
void MaximizeModeWindowManager::OnWindowBoundsChanged(
aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds) {
if (!IsContainerWindow(window))
return;
// Reposition all non maximizeable windows.
for (WindowToState::iterator it = window_state_map_.begin();
it != window_state_map_.end();
++it) {
it->second->UpdateWindowPosition(wm::GetWindowState(it->first));
}
}
void MaximizeModeWindowManager::OnDisplayAdded(const gfx::Display& display) {
DisplayConfigurationChanged();
}
void MaximizeModeWindowManager::OnDisplayRemoved(const gfx::Display& display) {
DisplayConfigurationChanged();
}
void MaximizeModeWindowManager::OnDisplayMetricsChanged(const gfx::Display&,
uint32_t) {
// Nothing to do here.
}
void MaximizeModeWindowManager::OnTouchEvent(ui::TouchEvent* event) {
if (event->type() != ui::ET_TOUCH_PRESSED)
return;
// Find the active window (from the primary screen) to un-fullscreen.
aura::Window* window = wm::GetActiveWindow();
if (!window)
return;
wm::WindowState* window_state = wm::GetWindowState(window);
if (!window_state->IsFullscreen() || window_state->in_immersive_fullscreen())
return;
// Test that the touch happened in the top or bottom lines.
int y = event->y();
if (y >= kLeaveFullScreenAreaHeightInPixel &&
y < (window->bounds().height() - kLeaveFullScreenAreaHeightInPixel)) {
return;
}
// Leave full screen mode.
event->StopPropagation();
wm::WMEvent toggle_fullscreen(wm::WM_EVENT_TOGGLE_FULLSCREEN);
window_state->OnWMEvent(&toggle_fullscreen);
}
MaximizeModeWindowManager::MaximizeModeWindowManager()
: backdrops_hidden_(false) {
// The overview mode needs to be ended before the maximize mode is started. To
// guarantee the proper order, it will be turned off from here.
CancelOverview();
MaximizeAllWindows();
AddWindowCreationObservers();
EnableBackdropBehindTopWindowOnEachDisplay(true);
gfx::Screen::GetScreen()->AddObserver(this);
Shell::GetInstance()->AddShellObserver(this);
Shell::GetInstance()->AddPreTargetHandler(this);
}
void MaximizeModeWindowManager::MaximizeAllWindows() {
MruWindowTracker::WindowList windows = ash::Shell::GetInstance()->
mru_window_tracker()->BuildWindowListIgnoreModal();
// Add all existing Mru windows.
for (MruWindowTracker::WindowList::iterator window = windows.begin();
window != windows.end(); ++window) {
MaximizeAndTrackWindow(*window);
}
}
void MaximizeModeWindowManager::RestoreAllWindows() {
while (window_state_map_.size())
ForgetWindow(window_state_map_.begin()->first);
}
void MaximizeModeWindowManager::SetDeferBoundsUpdates(
bool defer_bounds_updates) {
for (WindowToState::iterator it = window_state_map_.begin();
it != window_state_map_.end();
++it) {
it->second->SetDeferBoundsUpdates(defer_bounds_updates);
}
}
void MaximizeModeWindowManager::MaximizeAndTrackWindow(
aura::Window* window) {
if (!ShouldHandleWindow(window))
return;
DCHECK(window_state_map_.find(window) == window_state_map_.end());
window->AddObserver(this);
// We create and remember a maximize mode state which will attach itself to
// the provided state object.
window_state_map_[window] = new MaximizeModeWindowState(window, this);
}
void MaximizeModeWindowManager::ForgetWindow(aura::Window* window) {
WindowToState::iterator it = window_state_map_.find(window);
// The following DCHECK could fail if our window state object was destroyed
// earlier by someone else. However - at this point there is no other client
// which replaces the state object and therefore this should not happen.
DCHECK(it != window_state_map_.end());
window->RemoveObserver(this);
// By telling the state object to revert, it will switch back the old
// State object and destroy itself, calling WindowStateDestroyed().
it->second->LeaveMaximizeMode(wm::GetWindowState(it->first));
DCHECK(window_state_map_.find(window) == window_state_map_.end());
}
bool MaximizeModeWindowManager::ShouldHandleWindow(aura::Window* window) {
DCHECK(window);
// Windows with the always-on-top property should be free-floating and thus
// not managed by us.
if (window->GetProperty(aura::client::kAlwaysOnTopKey))
return false;
// Windows in the dock should not be managed by us.
if (wm::GetWindowState(window)->IsDocked())
return false;
return window->type() == ui::wm::WINDOW_TYPE_NORMAL;
}
void MaximizeModeWindowManager::AddWindowCreationObservers() {
DCHECK(observed_container_windows_.empty());
// Observe window activations/creations in the default containers on all root
// windows.
aura::Window::Windows root_windows = Shell::GetAllRootWindows();
for (aura::Window::Windows::const_iterator iter = root_windows.begin();
iter != root_windows.end(); ++iter) {
aura::Window* container =
Shell::GetContainer(*iter, kShellWindowId_DefaultContainer);
DCHECK(observed_container_windows_.find(container) ==
observed_container_windows_.end());
container->AddObserver(this);
observed_container_windows_.insert(container);
}
}
void MaximizeModeWindowManager::RemoveWindowCreationObservers() {
for (std::set<aura::Window*>::iterator iter =
observed_container_windows_.begin();
iter != observed_container_windows_.end(); ++iter) {
(*iter)->RemoveObserver(this);
}
observed_container_windows_.clear();
}
void MaximizeModeWindowManager::DisplayConfigurationChanged() {
EnableBackdropBehindTopWindowOnEachDisplay(false);
RemoveWindowCreationObservers();
AddWindowCreationObservers();
EnableBackdropBehindTopWindowOnEachDisplay(true);
}
bool MaximizeModeWindowManager::IsContainerWindow(aura::Window* window) {
return observed_container_windows_.find(window) !=
observed_container_windows_.end();
}
void MaximizeModeWindowManager::EnableBackdropBehindTopWindowOnEachDisplay(
bool enable) {
// This function should be a no-op if backdrops have been disabled.
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAshDisableMaximizeModeWindowBackdrop)) {
return;
}
if (backdrops_hidden_)
return;
// Inform the WorkspaceLayoutManager that we want to show a backdrop behind
// the topmost window of its container.
Shell::RootWindowControllerList controllers =
Shell::GetAllRootWindowControllers();
for (Shell::RootWindowControllerList::iterator iter = controllers.begin();
iter != controllers.end(); ++iter) {
RootWindowController* controller = *iter;
aura::Window* container = Shell::GetContainer(
controller->GetRootWindow(), kShellWindowId_DefaultContainer);
controller->workspace_controller()->SetMaximizeBackdropDelegate(
scoped_ptr<WorkspaceLayoutManagerDelegate>(
enable ? new WorkspaceBackdropDelegate(container) : NULL));
}
}
} // namespace ash
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