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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 "ash/wm/ash_focus_rules.h"
#include "ash/shell.h"
#include "ash/shell_delegate.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/window_state.h"
#include "ui/aura/window.h"
namespace ash {
namespace wm {
namespace {
// These are the list of container ids of containers which may contain windows
// that need to be activated in the order that they should be activated.
const int kWindowContainerIds[] = {
kShellWindowId_OverlayContainer,
kShellWindowId_LockSystemModalContainer,
kShellWindowId_SettingBubbleContainer,
kShellWindowId_LockScreenContainer,
kShellWindowId_SystemModalContainer,
kShellWindowId_AlwaysOnTopContainer,
kShellWindowId_AppListContainer,
kShellWindowId_DefaultContainer,
// Docked, panel, launcher and status are intentionally checked after other
// containers even though these layers are higher. The user expects their
// windows to be focused before these elements.
kShellWindowId_DockedContainer,
kShellWindowId_PanelContainer,
kShellWindowId_ShelfContainer,
kShellWindowId_StatusContainer, };
bool BelongsToContainerWithEqualOrGreaterId(const aura::Window* window,
int container_id) {
for (; window; window = window->parent()) {
if (window->id() >= container_id)
return true;
}
return false;
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
// AshFocusRules, public:
AshFocusRules::AshFocusRules() {
}
AshFocusRules::~AshFocusRules() {
}
bool AshFocusRules::IsWindowConsideredActivatable(aura::Window* window) const {
// Only toplevel windows can be activated.
if (!IsToplevelWindow(window))
return false;
// The window must be visible.
if (!IsWindowConsideredVisibleForActivation(window))
return false;
return true;
}
////////////////////////////////////////////////////////////////////////////////
// AshFocusRules, ::wm::FocusRules:
bool AshFocusRules::SupportsChildActivation(aura::Window* window) const {
if (window->id() == kShellWindowId_DefaultContainer)
return true;
for (size_t i = 0; i < arraysize(kWindowContainerIds); i++) {
if (window->id() == kWindowContainerIds[i])
return true;
}
return false;
}
bool AshFocusRules::IsWindowConsideredVisibleForActivation(
aura::Window* window) const {
// If the |window| doesn't belong to the current active user and also doesn't
// show for the current active user, then it should not be activated.
if (!Shell::GetInstance()->delegate()->CanShowWindowForUser(window))
return false;
if (BaseFocusRules::IsWindowConsideredVisibleForActivation(window))
return true;
// Minimized windows are hidden in their minimized state, but they can always
// be activated.
if (wm::GetWindowState(window)->IsMinimized())
return true;
return window->TargetVisibility() &&
(window->parent()->id() == kShellWindowId_DefaultContainer ||
window->parent()->id() == kShellWindowId_LockScreenContainer);
}
bool AshFocusRules::CanActivateWindow(aura::Window* window) const {
// Clearing activation is always permissible.
if (!window)
return true;
if (!BaseFocusRules::CanActivateWindow(window))
return false;
if (Shell::GetInstance()->IsSystemModalWindowOpen()) {
return BelongsToContainerWithEqualOrGreaterId(
window, kShellWindowId_SystemModalContainer);
}
return true;
}
aura::Window* AshFocusRules::GetNextActivatableWindow(
aura::Window* ignore) const {
DCHECK(ignore);
// Start from the container of the most-recently-used window. If the list of
// MRU windows is empty, then start from the container of the window that just
// lost focus |ignore|.
ash::MruWindowTracker* mru = ash::Shell::GetInstance()->mru_window_tracker();
std::vector<aura::Window*> windows = mru->BuildMruWindowList();
aura::Window* starting_window = windows.empty() ? ignore : windows[0];
// Look for windows to focus in |starting_window|'s container. If none are
// found, we look in all the containers in front of |starting_window|'s
// container, then all behind.
int starting_container_index = 0;
aura::Window* root = starting_window->GetRootWindow();
if (!root)
root = Shell::GetTargetRootWindow();
int container_count = static_cast<int>(arraysize(kWindowContainerIds));
for (int i = 0; i < container_count; i++) {
aura::Window* container = Shell::GetContainer(root, kWindowContainerIds[i]);
if (container && container->Contains(starting_window)) {
starting_container_index = i;
break;
}
}
aura::Window* window = nullptr;
for (int i = starting_container_index; !window && i < container_count; i++)
window = GetTopmostWindowToActivateForContainerIndex(i, ignore);
if (!window && starting_container_index > 0) {
for (int i = starting_container_index - 1; !window && i >= 0; i--)
window = GetTopmostWindowToActivateForContainerIndex(i, ignore);
}
return window;
}
////////////////////////////////////////////////////////////////////////////////
// AshFocusRules, private:
aura::Window* AshFocusRules::GetTopmostWindowToActivateForContainerIndex(
int index,
aura::Window* ignore) const {
aura::Window* window = NULL;
aura::Window* root = ignore ? ignore->GetRootWindow() : NULL;
aura::Window::Windows containers = Shell::GetContainersFromAllRootWindows(
kWindowContainerIds[index], root);
for (aura::Window::Windows::const_iterator iter = containers.begin();
iter != containers.end() && !window; ++iter) {
window = GetTopmostWindowToActivateInContainer((*iter), ignore);
}
return window;
}
aura::Window* AshFocusRules::GetTopmostWindowToActivateInContainer(
aura::Window* container,
aura::Window* ignore) const {
for (aura::Window::Windows::const_reverse_iterator i =
container->children().rbegin();
i != container->children().rend();
++i) {
WindowState* window_state = GetWindowState(*i);
if (*i != ignore &&
window_state->CanActivate() &&
!window_state->IsMinimized())
return *i;
}
return NULL;
}
} // namespace wm
} // namespace ash
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