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// Copyright 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 "ash/wm/mru_window_tracker.h"
#include <algorithm>
#include "ash/session_state_delegate.h"
#include "ash/shell.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/activation_controller.h"
#include "ash/wm/window_cycle_list.h"
#include "ash/wm/window_util.h"
#include "ash/wm/workspace_controller.h"
#include "ui/aura/root_window.h"
#include "ui/base/events/event.h"
#include "ui/base/events/event_handler.h"
namespace ash {
namespace {
// List of containers whose children we will allow switching to.
const int kContainerIds[] = {
internal::kShellWindowId_DefaultContainer,
internal::kShellWindowId_AlwaysOnTopContainer
};
// Adds all the children of |window| to |windows|.
void AddAllChildren(aura::Window* window,
MruWindowTracker::WindowList* windows) {
const MruWindowTracker::WindowList& children(window->children());
windows->insert(windows->end(), children.begin(), children.end());
}
// Adds all the children of all of |window|s children to |windows|.
void AddWorkspaceChildren(aura::Window* window,
MruWindowTracker::WindowList* windows) {
for (size_t i = 0; i < window->children().size(); ++i)
AddAllChildren(window->children()[i], windows);
}
// Adds the windows that can be cycled through for the specified window id to
// |windows|.
void AddTrackedWindows(aura::RootWindow* root,
int container_id,
MruWindowTracker::WindowList* windows) {
aura::Window* container = Shell::GetContainer(root, container_id);
if (container_id == internal::kShellWindowId_DefaultContainer)
AddWorkspaceChildren(container, windows);
else
AddAllChildren(container, windows);
}
// Returns a list of windows ordered by their stacking order.
// If |mru_windows| is passed, these windows are moved to the front of the list.
// If |top_most_at_end|, the list is returned in descending (bottom-most / least
// recently used) order.
MruWindowTracker::WindowList BuildWindowListInternal(
const std::list<aura::Window*>* mru_windows,
bool top_most_at_end) {
MruWindowTracker::WindowList windows;
Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
aura::RootWindow* active_root = Shell::GetActiveRootWindow();
for (Shell::RootWindowList::const_iterator iter = root_windows.begin();
iter != root_windows.end(); ++iter) {
if (*iter == active_root)
continue;
for (size_t i = 0; i < arraysize(kContainerIds); ++i)
AddTrackedWindows(*iter, kContainerIds[i], &windows);
}
// Add windows in the active root windows last so that the topmost window
// in the active root window becomes the front of the list.
for (size_t i = 0; i < arraysize(kContainerIds); ++i)
AddTrackedWindows(active_root, kContainerIds[i], &windows);
// Removes unfocusable windows.
MruWindowTracker::WindowList::iterator last =
std::remove_if(
windows.begin(),
windows.end(),
std::not1(std::ptr_fun(ash::wm::CanActivateWindow)));
windows.erase(last, windows.end());
// Put the windows in the mru_windows list at the head, if it's available.
if (mru_windows) {
// Iterate through the list backwards, so that we can move each window to
// the front of the windows list as we find them.
for (std::list<aura::Window*>::const_reverse_iterator ix =
mru_windows->rbegin();
ix != mru_windows->rend(); ++ix) {
MruWindowTracker::WindowList::iterator window =
std::find(windows.begin(), windows.end(), *ix);
if (window != windows.end()) {
windows.erase(window);
windows.push_back(*ix);
}
}
}
// Window cycling expects the topmost window at the front of the list.
if (!top_most_at_end)
std::reverse(windows.begin(), windows.end());
return windows;
}
} // namespace
//////////////////////////////////////////////////////////////////////////////
// MruWindowTracker, public:
MruWindowTracker::MruWindowTracker(
aura::client::ActivationClient* activation_client)
: activation_client_(activation_client),
ignore_window_activations_(false) {
activation_client_->AddObserver(this);
}
MruWindowTracker::~MruWindowTracker() {
Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
for (Shell::RootWindowList::const_iterator iter = root_windows.begin();
iter != root_windows.end(); ++iter) {
for (size_t i = 0; i < arraysize(kContainerIds); ++i) {
aura::Window* container = Shell::GetContainer(*iter, kContainerIds[i]);
if (container)
container->RemoveObserver(this);
}
aura::Window* default_container =
Shell::GetContainer(*iter, internal::kShellWindowId_DefaultContainer);
if (default_container) {
for (size_t i = 0; i < default_container->children().size(); ++i) {
aura::Window* workspace_window = default_container->children()[i];
DCHECK_EQ(internal::kShellWindowId_WorkspaceContainer,
workspace_window->id());
workspace_window->RemoveObserver(this);
}
}
}
activation_client_->RemoveObserver(this);
}
// static
MruWindowTracker::WindowList MruWindowTracker::BuildWindowList(
bool top_most_at_end) {
return BuildWindowListInternal(NULL, top_most_at_end);
}
MruWindowTracker::WindowList MruWindowTracker::BuildMruWindowList() {
return BuildWindowListInternal(&mru_windows_, false);
}
void MruWindowTracker::OnRootWindowAdded(aura::RootWindow* root_window) {
for (size_t i = 0; i < arraysize(kContainerIds); ++i) {
aura::Window* container =
Shell::GetContainer(root_window, kContainerIds[i]);
container->AddObserver(this);
}
aura::Window* default_container =
Shell::GetContainer(root_window,
internal::kShellWindowId_DefaultContainer);
for (size_t i = 0; i < default_container->children().size(); ++i) {
aura::Window* workspace_window = default_container->children()[i];
DCHECK_EQ(internal::kShellWindowId_WorkspaceContainer,
workspace_window->id());
workspace_window->AddObserver(this);
}
}
void MruWindowTracker::SetIgnoreActivations(bool ignore) {
ignore_window_activations_ = ignore;
// If no longer ignoring window activations, move currently active window
// to front.
if (!ignore) {
aura::Window* active_window = wm::GetActiveWindow();
mru_windows_.remove(active_window);
mru_windows_.push_front(active_window);
}
}
//////////////////////////////////////////////////////////////////////////////
// MruWindowTracker, private:
// static
bool MruWindowTracker::IsTrackedContainer(aura::Window* window) {
if (!window)
return false;
for (size_t i = 0; i < arraysize(kContainerIds); ++i) {
if (window->id() == kContainerIds[i]) {
return true;
}
}
return window->id() == internal::kShellWindowId_WorkspaceContainer;
}
void MruWindowTracker::OnWindowActivated(aura::Window* gained_active,
aura::Window* lost_active) {
if (gained_active && !ignore_window_activations_ &&
IsTrackedContainer(gained_active->parent())) {
mru_windows_.remove(gained_active);
mru_windows_.push_front(gained_active);
}
}
void MruWindowTracker::OnWindowAdded(aura::Window* window) {
if (window->id() == internal::kShellWindowId_WorkspaceContainer)
window->AddObserver(this);
}
void MruWindowTracker::OnWillRemoveWindow(aura::Window* window) {
mru_windows_.remove(window);
if (window->id() == internal::kShellWindowId_WorkspaceContainer)
window->RemoveObserver(this);
}
void MruWindowTracker::OnWindowDestroying(aura::Window* window) {
window->RemoveObserver(this);
}
} // namespace ash
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