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default_state.cc
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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/default_state.h"
#include "ash/public/cpp/metrics_util.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/public/cpp/window_animation_types.h"
#include "ash/root_window_controller.h"
#include "ash/screen_util.h"
#include "ash/shell.h"
#include "ash/wm/screen_pinning_controller.h"
#include "ash/wm/window_positioning_utils.h"
#include "ash/wm/window_state.h"
#include "ash/wm/window_state_delegate.h"
#include "ash/wm/window_state_util.h"
#include "ash/wm/wm_event.h"
#include "ash/wm/workspace_controller.h"
#include "base/bind.h"
#include "base/metrics/histogram_macros.h"
#include "chromeos/ui/base/window_state_type.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/compositor/animation_throughput_reporter.h"
#include "ui/display/display.h"
#include "ui/display/display_observer.h"
#include "ui/display/screen.h"
#include "ui/wm/core/window_util.h"
namespace ash {
namespace {
using ::chromeos::WindowStateType;
// This specifies how much percent (30%) of a window rect
// must be visible when the window is added to the workspace.
const float kMinimumPercentOnScreenArea = 0.3f;
// When a window that has restore bounds at least as large as a work area is
// unmaximized, inset the bounds slightly so that they are not exactly the same.
// This makes it easier to resize the window.
const int kMaximizedWindowInset = 10; // DIPs.
constexpr char kSnapWindowSmoothnessHistogramName[] =
"Ash.Window.AnimationSmoothness.Snap";
gfx::Size GetWindowMaximumSize(aura::Window* window) {
return window->delegate() ? window->delegate()->GetMaximumSize()
: gfx::Size();
}
void MoveToDisplayForRestore(WindowState* window_state) {
if (!window_state->HasRestoreBounds())
return;
const gfx::Rect restore_bounds = window_state->GetRestoreBoundsInScreen();
// Move only if the restore bounds is outside of
// the display. There is no information about in which
// display it should be restored, so this is best guess.
// TODO(oshima): Restore information should contain the
// work area information like WindowResizer does for the
// last window location.
gfx::Rect display_area = display::Screen::GetScreen()
->GetDisplayNearestWindow(window_state->window())
.bounds();
if (!display_area.Intersects(restore_bounds)) {
const display::Display& display =
display::Screen::GetScreen()->GetDisplayMatching(restore_bounds);
RootWindowController* new_root_controller =
Shell::Get()->GetRootWindowControllerWithDisplayId(display.id());
if (new_root_controller->GetRootWindow() !=
window_state->window()->GetRootWindow()) {
aura::Window* new_container =
new_root_controller->GetRootWindow()->GetChildById(
window_state->window()->parent()->id());
new_container->AddChild(window_state->window());
}
}
}
} // namespace
DefaultState::DefaultState(WindowStateType initial_state_type)
: BaseState(initial_state_type), stored_window_state_(nullptr) {}
DefaultState::~DefaultState() = default;
void DefaultState::AttachState(WindowState* window_state,
WindowState::State* state_in_previous_mode) {
DCHECK_EQ(stored_window_state_, window_state);
// If previous state is unminimized but window state is minimized, sync window
// state to unminimized.
if (window_state->IsMinimized() && !chromeos::IsMinimizedWindowStateType(
state_in_previous_mode->GetType())) {
aura::Window* window = window_state->window();
window->SetProperty(
aura::client::kShowStateKey,
window->GetProperty(aura::client::kPreMinimizedShowStateKey));
}
ReenterToCurrentState(window_state, state_in_previous_mode);
// If the display has changed while in the another mode,
// we need to let windows know the change.
display::Display current_display =
display::Screen::GetScreen()->GetDisplayNearestWindow(
window_state->window());
if (stored_display_state_.bounds() != current_display.bounds()) {
const DisplayMetricsChangedWMEvent event(
display::DisplayObserver::DISPLAY_METRIC_BOUNDS);
window_state->OnWMEvent(&event);
} else if (stored_display_state_.work_area() != current_display.work_area()) {
const WMEvent event(WM_EVENT_WORKAREA_BOUNDS_CHANGED);
window_state->OnWMEvent(&event);
}
}
void DefaultState::DetachState(WindowState* window_state) {
stored_window_state_ = window_state;
stored_bounds_ = window_state->window()->bounds();
stored_restore_bounds_ = window_state->HasRestoreBounds()
? window_state->GetRestoreBoundsInParent()
: gfx::Rect();
// Remember the display state so that in case of the display change
// while in the other mode, we can perform necessary action to
// restore the window state to the proper state for the current
// display.
stored_display_state_ = display::Screen::GetScreen()->GetDisplayNearestWindow(
window_state->window());
}
void DefaultState::HandleWorkspaceEvents(WindowState* window_state,
const WMEvent* event) {
switch (event->type()) {
case WM_EVENT_ADDED_TO_WORKSPACE: {
// When a window is dragged and dropped onto a different
// root window, the bounds will be updated after they are added
// to the root window.
// If a window is opened as maximized or fullscreen, its bounds may be
// empty, so update the bounds now before checking empty.
if (window_state->is_dragged() ||
window_state->allow_set_bounds_direct() ||
SetMaximizedOrFullscreenBounds(window_state)) {
return;
}
aura::Window* window = window_state->window();
gfx::Rect bounds = window->bounds();
// When window is added to a workspace, |bounds| may be not the original
// not-changed-by-user bounds, for example a resized bounds truncated by
// available workarea. If the window is visible on all desks, its
// bounds are global across workspaces so don't restore to pre-added
// bounds.
if (window_state->pre_added_to_workspace_window_bounds() &&
!window->GetProperty(aura::client::kVisibleOnAllWorkspacesKey)) {
bounds = *window_state->pre_added_to_workspace_window_bounds();
}
// Don't adjust window bounds if the bounds are empty as this
// happens when a new views::Widget is created.
if (bounds.IsEmpty())
return;
// Only windows of type WINDOW_TYPE_NORMAL need to be adjusted to have
// minimum visibility, because they are positioned by the user and the
// user should always be able to interact with them. Other windows are
// positioned programmatically.
if (!window_state->IsUserPositionable())
return;
// Use entire display instead of workarea. The logic ensures 30%
// visibility which should be enough to see where the window gets
// moved.
gfx::Rect display_area = screen_util::GetDisplayBoundsInParent(window);
int min_width = bounds.width() * kMinimumPercentOnScreenArea;
int min_height = bounds.height() * kMinimumPercentOnScreenArea;
AdjustBoundsToEnsureWindowVisibility(display_area, min_width, min_height,
&bounds);
window_state->AdjustSnappedBounds(&bounds);
if (window->bounds() != bounds)
window_state->SetBoundsConstrained(bounds);
return;
}
case WM_EVENT_DISPLAY_BOUNDS_CHANGED: {
// When display bounds has changed, make sure the entire window is fully
// visible.
UpdateBoundsForDisplayOrWorkAreaBoundsChange(
window_state, /*ensure_full_window_visibility=*/true);
return;
}
case WM_EVENT_WORKAREA_BOUNDS_CHANGED: {
// Don't resize the maximized window when the desktop is covered
// by fullscreen window. crbug.com/504299.
// TODO(afakhry): Decide whether we want the active desk's workspace, or
// the workspace of the desk of `window_state->window()`.
// For now use the active desk's.
auto* workspace_controller =
GetActiveWorkspaceController(window_state->window()->GetRootWindow());
DCHECK(workspace_controller);
bool in_fullscreen = workspace_controller->GetWindowState() ==
WorkspaceWindowState::kFullscreen;
if (in_fullscreen && window_state->IsMaximized())
return;
UpdateBoundsForDisplayOrWorkAreaBoundsChange(
window_state, /*ensure_full_window_visibility=*/false);
return;
}
case WM_EVENT_SYSTEM_UI_AREA_CHANGED:
break;
default:
NOTREACHED() << "Unknown event:" << event->type();
}
}
void DefaultState::HandleCompoundEvents(WindowState* window_state,
const WMEvent* event) {
aura::Window* window = window_state->window();
switch (event->type()) {
case WM_EVENT_TOGGLE_MAXIMIZE_CAPTION:
if (window_state->IsFullscreen()) {
const WMEvent event(WM_EVENT_TOGGLE_FULLSCREEN);
window_state->OnWMEvent(&event);
} else if (window_state->IsMaximized()) {
window_state->Restore();
} else if (window_state->IsNormalOrSnapped()) {
if (window_state->CanMaximize())
window_state->Maximize();
}
return;
case WM_EVENT_TOGGLE_MAXIMIZE:
if (window_state->IsFullscreen()) {
const WMEvent event(WM_EVENT_TOGGLE_FULLSCREEN);
window_state->OnWMEvent(&event);
} else if (window_state->IsMaximized()) {
window_state->Restore();
} else if (window_state->CanMaximize()) {
window_state->Maximize();
}
return;
case WM_EVENT_TOGGLE_VERTICAL_MAXIMIZE: {
gfx::Rect work_area =
screen_util::GetDisplayWorkAreaBoundsInParent(window);
// Maximize vertically if:
// - The window does not have a max height defined.
// - The window has the normal state type. Snapped windows are excluded
// because they are already maximized vertically and reverting to the
// restored bounds looks weird.
if (GetWindowMaximumSize(window).height() != 0 ||
!window_state->IsNormalStateType()) {
return;
}
if (window_state->HasRestoreBounds() &&
(window->bounds().height() == work_area.height() &&
window->bounds().y() == work_area.y())) {
window_state->SetAndClearRestoreBounds();
} else {
window_state->SaveCurrentBoundsForRestore();
window->SetBounds(gfx::Rect(window->bounds().x(), work_area.y(),
window->bounds().width(),
work_area.height()));
}
return;
}
case WM_EVENT_TOGGLE_HORIZONTAL_MAXIMIZE: {
// Maximize horizontally if:
// - The window does not have a max width defined.
// - The window is snapped or has the normal state type.
if (GetWindowMaximumSize(window).width() != 0)
return;
if (!window_state->IsNormalOrSnapped())
return;
gfx::Rect work_area =
screen_util::GetDisplayWorkAreaBoundsInParent(window);
if (window_state->IsNormalStateType() &&
window_state->HasRestoreBounds() &&
(window->bounds().width() == work_area.width() &&
window->bounds().x() == work_area.x())) {
window_state->SetAndClearRestoreBounds();
} else {
gfx::Rect new_bounds(work_area.x(), window->bounds().y(),
work_area.width(), window->bounds().height());
gfx::Rect restore_bounds = window->GetTargetBounds();
if (window_state->IsSnapped()) {
window_state->SetRestoreBoundsInParent(new_bounds);
window_state->Restore();
// The restore logic prevents a window from being restored to bounds
// which match the workspace bounds exactly so it is necessary to set
// the bounds again below.
}
window_state->SetRestoreBoundsInParent(restore_bounds);
window->SetBounds(new_bounds);
}
return;
}
case WM_EVENT_TOGGLE_FULLSCREEN:
ToggleFullScreen(window_state, window_state->delegate());
return;
case WM_EVENT_CYCLE_SNAP_LEFT:
case WM_EVENT_CYCLE_SNAP_RIGHT:
CycleSnap(window_state, event->type());
return;
default:
NOTREACHED() << "Unknown event:" << event->type();
break;
}
}
void DefaultState::HandleBoundsEvents(WindowState* window_state,
const WMEvent* event) {
switch (event->type()) {
case WM_EVENT_SET_BOUNDS: {
const SetBoundsWMEvent* set_bounds_event =
static_cast<const SetBoundsWMEvent*>(event);
SetBounds(window_state, set_bounds_event);
} break;
case WM_EVENT_CENTER:
CenterWindow(window_state);
break;
default:
NOTREACHED() << "Unknown event:" << event->type();
break;
}
}
void DefaultState::HandleTransitionEvents(WindowState* window_state,
const WMEvent* event) {
WindowStateType current_state_type = window_state->GetStateType();
WindowStateType next_state_type = GetStateForTransitionEvent(event);
if (event->IsPinEvent()) {
// If there already is a pinned window, it is not allowed to set it
// to this window.
// TODO(hidehiko): If a system modal window is openening, the pinning
// probably should fail.
if (Shell::Get()->screen_pinning_controller()->IsPinned()) {
LOG(ERROR) << "An PIN event will be failed since another window is "
<< "already in pinned mode.";
next_state_type = current_state_type;
}
}
if (next_state_type == current_state_type && window_state->IsSnapped()) {
gfx::Rect snapped_bounds = GetSnappedWindowBoundsInParent(
window_state->window(), event->type() == WM_EVENT_SNAP_LEFT
? WindowStateType::kLeftSnapped
: WindowStateType::kRightSnapped);
window_state->SetBoundsDirectAnimated(snapped_bounds);
return;
}
if (event->type() == WM_EVENT_SNAP_LEFT ||
event->type() == WM_EVENT_SNAP_RIGHT) {
window_state->set_bounds_changed_by_user(true);
}
EnterToNextState(window_state, next_state_type);
}
// static
bool DefaultState::SetMaximizedOrFullscreenBounds(WindowState* window_state) {
DCHECK(!window_state->is_dragged());
DCHECK(!window_state->allow_set_bounds_direct());
if (window_state->IsMaximized()) {
window_state->SetBoundsDirect(
screen_util::GetMaximizedWindowBoundsInParent(window_state->window()));
return true;
}
if (window_state->IsFullscreen() || window_state->IsPinned()) {
window_state->SetBoundsDirect(
screen_util::GetFullscreenWindowBoundsInParent(window_state->window()));
return true;
}
return false;
}
// static
void DefaultState::SetBounds(WindowState* window_state,
const SetBoundsWMEvent* event) {
if (window_state->is_dragged() || window_state->allow_set_bounds_direct()) {
if (event->animate()) {
window_state->SetBoundsDirectAnimated(event->requested_bounds(),
event->duration());
} else {
// TODO(oshima|varkha): Is this still needed? crbug.com/485612.
window_state->SetBoundsDirect(event->requested_bounds());
}
} else if (!SetMaximizedOrFullscreenBounds(window_state)) {
if (event->animate()) {
window_state->SetBoundsDirectAnimated(event->requested_bounds(),
event->duration());
} else {
window_state->SetBoundsConstrained(event->requested_bounds());
// Update the restore size if the bounds is updated by PIP itself.
if (window_state->IsPip() && window_state->HasRestoreBounds()) {
gfx::Rect restore_bounds = window_state->GetRestoreBoundsInScreen();
restore_bounds.set_size(
window_state->window()->GetTargetBounds().size());
window_state->SetRestoreBoundsInScreen(restore_bounds);
}
}
}
}
void DefaultState::EnterToNextState(WindowState* window_state,
WindowStateType next_state_type) {
// Do nothing if we're already in the same state.
if (state_type_ == next_state_type)
return;
WindowStateType previous_state_type = state_type_;
state_type_ = next_state_type;
window_state->UpdateWindowPropertiesFromStateType();
window_state->NotifyPreStateTypeChange(previous_state_type);
// Don't update the window if the window is detached from parent.
// This can happen during dragging.
// TODO(oshima): This was added for DOCKED windows. Investigate if
// we still need this.
if (window_state->window()->parent()) {
if (!window_state->HasRestoreBounds() &&
IsNormalWindowStateType(previous_state_type) &&
!window_state->IsMinimized() && !window_state->IsNormalStateType()) {
window_state->SaveCurrentBoundsForRestore();
}
// When restoring from a minimized state, we want to restore to the
// previous bounds. However, we want to maintain the restore bounds.
// (The restore bounds are set if a user maximized the window in one
// axis by double clicking the window border for example).
gfx::Rect restore_bounds_in_screen;
if (previous_state_type == WindowStateType::kMinimized &&
window_state->IsNormalStateType() && window_state->HasRestoreBounds() &&
!window_state->unminimize_to_restore_bounds()) {
restore_bounds_in_screen = window_state->GetRestoreBoundsInScreen();
window_state->SaveCurrentBoundsForRestore();
}
if (window_state->IsMaximizedOrFullscreenOrPinned())
MoveToDisplayForRestore(window_state);
UpdateBoundsFromState(window_state, previous_state_type);
UpdateMinimizedState(window_state, previous_state_type);
// Normal state should have no restore bounds unless it's
// unminimized.
if (!restore_bounds_in_screen.IsEmpty())
window_state->SetRestoreBoundsInScreen(restore_bounds_in_screen);
else if (window_state->IsNormalStateType())
window_state->ClearRestoreBounds();
}
window_state->NotifyPostStateTypeChange(previous_state_type);
if (next_state_type == WindowStateType::kPinned ||
previous_state_type == WindowStateType::kPinned ||
next_state_type == WindowStateType::kTrustedPinned ||
previous_state_type == WindowStateType::kTrustedPinned) {
Shell::Get()->screen_pinning_controller()->SetPinnedWindow(
window_state->window());
}
}
void DefaultState::ReenterToCurrentState(
WindowState* window_state,
WindowState::State* state_in_previous_mode) {
WindowStateType previous_state_type = state_in_previous_mode->GetType();
// A state change should not move a window into or out of full screen or
// pinned since these are "special mode" the user wanted to be in and
// should be respected as such.
if (previous_state_type == WindowStateType::kFullscreen ||
previous_state_type == WindowStateType::kPinned ||
previous_state_type == WindowStateType::kTrustedPinned) {
state_type_ = previous_state_type;
} else if (state_type_ == WindowStateType::kFullscreen ||
state_type_ == WindowStateType::kPinned ||
state_type_ == WindowStateType::kTrustedPinned) {
state_type_ = previous_state_type;
}
window_state->UpdateWindowPropertiesFromStateType();
window_state->NotifyPreStateTypeChange(previous_state_type);
if (IsNormalWindowStateType(state_type_) && !stored_bounds_.IsEmpty()) {
// Use the restore mechanism to set the bounds for
// the window in normal state. This also covers unminimize case.
window_state->SetRestoreBoundsInParent(stored_bounds_);
}
UpdateBoundsFromState(window_state, state_in_previous_mode->GetType());
UpdateMinimizedState(window_state, state_in_previous_mode->GetType());
// Then restore the restore bounds to their previous value.
if (!stored_restore_bounds_.IsEmpty())
window_state->SetRestoreBoundsInParent(stored_restore_bounds_);
else
window_state->ClearRestoreBounds();
window_state->NotifyPostStateTypeChange(previous_state_type);
}
void DefaultState::UpdateBoundsFromState(WindowState* window_state,
WindowStateType previous_state_type) {
aura::Window* window = window_state->window();
gfx::Rect bounds_in_parent;
switch (state_type_) {
case WindowStateType::kLeftSnapped:
case WindowStateType::kRightSnapped:
bounds_in_parent =
GetSnappedWindowBoundsInParent(window_state->window(), state_type_);
break;
case WindowStateType::kDefault:
case WindowStateType::kNormal: {
gfx::Rect work_area_in_parent =
screen_util::GetDisplayWorkAreaBoundsInParent(window);
if (window_state->HasRestoreBounds()) {
bounds_in_parent = window_state->GetRestoreBoundsInParent();
// Check if the |window|'s restored size is bigger than the working area
// This may happen if a window was resized to maximized bounds or if the
// display resolution changed while the window was maximized.
if (previous_state_type == WindowStateType::kMaximized &&
bounds_in_parent.width() >= work_area_in_parent.width() &&
bounds_in_parent.height() >= work_area_in_parent.height()) {
bounds_in_parent = work_area_in_parent;
bounds_in_parent.Inset(kMaximizedWindowInset, kMaximizedWindowInset,
kMaximizedWindowInset, kMaximizedWindowInset);
}
} else {
bounds_in_parent = window->bounds();
}
// Make sure that part of the window is always visible.
if (!window_state->is_dragged()) {
// Avoid doing this while the window is being dragged as its root
// window hasn't been updated yet in the case of dragging to another
// display. crbug.com/666836.
AdjustBoundsToEnsureMinimumWindowVisibility(work_area_in_parent,
&bounds_in_parent);
}
break;
}
case WindowStateType::kMaximized:
bounds_in_parent = screen_util::GetMaximizedWindowBoundsInParent(window);
break;
case WindowStateType::kFullscreen:
case WindowStateType::kPinned:
case WindowStateType::kTrustedPinned:
bounds_in_parent = screen_util::GetFullscreenWindowBoundsInParent(window);
break;
case WindowStateType::kMinimized:
break;
case WindowStateType::kInactive:
case WindowStateType::kAutoPositioned:
case WindowStateType::kPip:
return;
}
if (window_state->IsMinimized())
return;
if (IsMinimizedWindowStateType(previous_state_type) ||
window_state->IsFullscreen() || window_state->IsPinned() ||
window_state->bounds_animation_type() ==
WindowState::BoundsChangeAnimationType::IMMEDIATE) {
window_state->SetBoundsDirect(bounds_in_parent);
} else if (window_state->IsMaximized() ||
IsMaximizedOrFullscreenOrPinnedWindowStateType(
previous_state_type)) {
window_state->SetBoundsDirectCrossFade(bounds_in_parent);
} else if (window_state->is_dragged()) {
// SetBoundsDirectAnimated does not work when the window gets reparented.
// TODO(oshima): Consider fixing it and re-enable the animation.
window_state->SetBoundsDirect(bounds_in_parent);
} else {
// Record smoothness of the snapping animation if the size of the window
// changes.
base::Optional<ui::AnimationThroughputReporter> reporter;
if (window_state->IsSnapped() &&
bounds_in_parent.size() != window->bounds().size()) {
reporter.emplace(
window_state->window()->layer()->GetAnimator(),
metrics_util::ForSmoothness(base::BindRepeating([](int smoothness) {
UMA_HISTOGRAM_PERCENTAGE(kSnapWindowSmoothnessHistogramName,
smoothness);
})));
}
window_state->SetBoundsDirectAnimated(bounds_in_parent);
}
}
void DefaultState::UpdateBoundsForDisplayOrWorkAreaBoundsChange(
WindowState* window_state,
bool ensure_full_window_visibility) {
if (window_state->is_dragged() || window_state->allow_set_bounds_direct() ||
SetMaximizedOrFullscreenBounds(window_state)) {
return;
}
const gfx::Rect work_area_in_parent =
screen_util::GetDisplayWorkAreaBoundsInParent(window_state->window());
gfx::Rect bounds = window_state->window()->GetTargetBounds();
if (ensure_full_window_visibility)
bounds.AdjustToFit(work_area_in_parent);
else if (!::wm::GetTransientParent(window_state->window()))
AdjustBoundsToEnsureMinimumWindowVisibility(work_area_in_parent, &bounds);
window_state->AdjustSnappedBounds(&bounds);
if (window_state->window()->GetTargetBounds() == bounds)
return;
if (window_state->bounds_animation_type() ==
WindowState::BoundsChangeAnimationType::IMMEDIATE) {
window_state->SetBoundsDirect(bounds);
} else {
window_state->SetBoundsDirectAnimated(bounds);
}
}
} // namespace ash