chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/system_modal_container_layout_manager.cc

-// 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/common/wm/system_modal_container_layout_manager.h"
-
-#include <cmath>
-
-#include "ash/common/session/session_state_delegate.h"
-#include "ash/common/wm/window_dimmer.h"
-#include "ash/common/wm_shell.h"
-#include "ash/common/wm_window.h"
-#include "ash/public/cpp/shell_window_ids.h"
-#include "base/memory/ptr_util.h"
-#include "base/stl_util.h"
-#include "ui/aura/client/aura_constants.h"
-#include "ui/aura/window.h"
-#include "ui/keyboard/keyboard_controller.h"
-
-namespace ash {
-namespace {
-
-// The center point of the window can diverge this much from the center point
-// of the container to be kept centered upon resizing operations.
-const int kCenterPixelDelta = 32;
-
-ui::ModalType GetModalType(WmWindow* window) {
-  return static_cast<ui::ModalType>(
-      window->aura_window()->GetProperty(aura::client::kModalKey));
-}
-
-bool HasTransientAncestor(const WmWindow* window, const WmWindow* ancestor) {
-  const WmWindow* transient_parent = window->GetTransientParent();
-  if (transient_parent == ancestor)
-    return true;
-  return transient_parent ? HasTransientAncestor(transient_parent, ancestor)
-                          : false;
-}
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// SystemModalContainerLayoutManager, public:
-
-SystemModalContainerLayoutManager::SystemModalContainerLayoutManager(
-    WmWindow* container)
-    : container_(container) {}
-
-SystemModalContainerLayoutManager::~SystemModalContainerLayoutManager() {
-  if (keyboard::KeyboardController::GetInstance())
-    keyboard::KeyboardController::GetInstance()->RemoveObserver(this);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// SystemModalContainerLayoutManager, WmLayoutManager implementation:
-
-void SystemModalContainerLayoutManager::OnChildWindowVisibilityChanged(
-    WmWindow* window,
-    bool visible) {
-  if (GetModalType(window) != ui::MODAL_TYPE_SYSTEM)
-    return;
-
-  if (window->IsVisible()) {
-    DCHECK(!base::ContainsValue(modal_windows_, window));
-    AddModalWindow(window);
-  } else {
-    if (RemoveModalWindow(window))
-      WmShell::Get()->OnModalWindowRemoved(window);
-  }
-}
-
-void SystemModalContainerLayoutManager::OnWindowResized() {
-  PositionDialogsAfterWorkAreaResize();
-}
-
-void SystemModalContainerLayoutManager::OnWindowAddedToLayout(WmWindow* child) {
-  DCHECK(child->GetType() == ui::wm::WINDOW_TYPE_NORMAL ||
-         child->GetType() == ui::wm::WINDOW_TYPE_POPUP);
-  // TODO(mash): IsUserSessionBlocked() depends on knowing the login state. We
-  // need a non-stub version of SessionStateDelegate. crbug.com/648964
-  if (!WmShell::Get()->IsRunningInMash()) {
-    DCHECK(container_->GetShellWindowId() !=
-               kShellWindowId_LockSystemModalContainer ||
-           WmShell::Get()->GetSessionStateDelegate()->IsUserSessionBlocked());
-  }
-  // Since this is for SystemModal, there is no good reason to add windows
-  // other than MODAL_TYPE_NONE or MODAL_TYPE_SYSTEM. DCHECK to avoid simple
-  // mistake.
-  DCHECK_NE(GetModalType(child), ui::MODAL_TYPE_CHILD);
-  DCHECK_NE(GetModalType(child), ui::MODAL_TYPE_WINDOW);
-
-  child->aura_window()->AddObserver(this);
-  if (GetModalType(child) == ui::MODAL_TYPE_SYSTEM && child->IsVisible())
-    AddModalWindow(child);
-}
-
-void SystemModalContainerLayoutManager::OnWillRemoveWindowFromLayout(
-    WmWindow* child) {
-  child->aura_window()->RemoveObserver(this);
-  windows_to_center_.erase(child);
-  if (GetModalType(child) == ui::MODAL_TYPE_SYSTEM)
-    RemoveModalWindow(child);
-}
-
-void SystemModalContainerLayoutManager::SetChildBounds(
-    WmWindow* child,
-    const gfx::Rect& requested_bounds) {
-  WmSnapToPixelLayoutManager::SetChildBounds(child, requested_bounds);
-  if (IsBoundsCentered(requested_bounds))
-    windows_to_center_.insert(child);
-  else
-    windows_to_center_.erase(child);
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// SystemModalContainerLayoutManager, aura::WindowObserver implementation:
-
-void SystemModalContainerLayoutManager::OnWindowPropertyChanged(
-    aura::Window* window,
-    const void* key,
-    intptr_t old) {
-  if (key != aura::client::kModalKey || !window->IsVisible())
-    return;
-
-  WmWindow* wm_window = WmWindow::Get(window);
-  if (window->GetProperty(aura::client::kModalKey) == ui::MODAL_TYPE_SYSTEM) {
-    if (base::ContainsValue(modal_windows_, wm_window))
-      return;
-    AddModalWindow(wm_window);
-  } else {
-    if (RemoveModalWindow(wm_window))
-      WmShell::Get()->OnModalWindowRemoved(wm_window);
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// SystemModalContainerLayoutManager, Keyboard::KeybaordControllerObserver
-// implementation:
-
-void SystemModalContainerLayoutManager::OnKeyboardBoundsChanging(
-    const gfx::Rect& new_bounds) {
-  PositionDialogsAfterWorkAreaResize();
-}
-
-void SystemModalContainerLayoutManager::OnKeyboardClosed() {}
-
-bool SystemModalContainerLayoutManager::IsPartOfActiveModalWindow(
-    WmWindow* window) {
-  return modal_window() &&
-         (modal_window()->Contains(window) ||
-          HasTransientAncestor(window->GetToplevelWindowForFocus(),
-                               modal_window()));
-}
-
-bool SystemModalContainerLayoutManager::ActivateNextModalWindow() {
-  if (modal_windows_.empty())
-    return false;
-  modal_window()->Activate();
-  return true;
-}
-
-void SystemModalContainerLayoutManager::CreateModalBackground() {
-  if (!window_dimmer_) {
-    window_dimmer_ = base::MakeUnique<WindowDimmer>(container_);
-    window_dimmer_->window()->SetName(
-        "SystemModalContainerLayoutManager.ModalBackground");
-    // There isn't always a keyboard controller.
-    if (keyboard::KeyboardController::GetInstance())
-      keyboard::KeyboardController::GetInstance()->AddObserver(this);
-  }
-  window_dimmer_->window()->Show();
-}
-
-void SystemModalContainerLayoutManager::DestroyModalBackground() {
-  if (!window_dimmer_)
-    return;
-
-  if (keyboard::KeyboardController::GetInstance())
-    keyboard::KeyboardController::GetInstance()->RemoveObserver(this);
-  window_dimmer_.reset();
-}
-
-// static
-bool SystemModalContainerLayoutManager::IsModalBackground(WmWindow* window) {
-  int id = window->GetParent()->GetShellWindowId();
-  if (id != kShellWindowId_SystemModalContainer &&
-      id != kShellWindowId_LockSystemModalContainer)
-    return false;
-  SystemModalContainerLayoutManager* layout_manager =
-      static_cast<SystemModalContainerLayoutManager*>(
-          window->GetParent()->GetLayoutManager());
-  return layout_manager->window_dimmer_ &&
-         layout_manager->window_dimmer_->window() == window;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// SystemModalContainerLayoutManager, private:
-
-void SystemModalContainerLayoutManager::AddModalWindow(WmWindow* window) {
-  if (modal_windows_.empty()) {
-    WmWindow* capture_window = WmShell::Get()->GetCaptureWindow();
-    if (capture_window)
-      capture_window->ReleaseCapture();
-  }
-  DCHECK(window->IsVisible());
-  DCHECK(!base::ContainsValue(modal_windows_, window));
-
-  modal_windows_.push_back(window);
-  WmShell::Get()->CreateModalBackground(window);
-  window->GetParent()->StackChildAtTop(window);
-
-  gfx::Rect target_bounds = window->GetBounds();
-  target_bounds.AdjustToFit(GetUsableDialogArea());
-  window->SetBounds(target_bounds);
-}
-
-bool SystemModalContainerLayoutManager::RemoveModalWindow(WmWindow* window) {
-  auto it = std::find(modal_windows_.begin(), modal_windows_.end(), window);
-  if (it == modal_windows_.end())
-    return false;
-  modal_windows_.erase(it);
-  return true;
-}
-
-void SystemModalContainerLayoutManager::PositionDialogsAfterWorkAreaResize() {
-  if (modal_windows_.empty())
-    return;
-
-  for (WmWindow* window : modal_windows_)
-    window->SetBounds(GetCenteredAndOrFittedBounds(window));
-}
-
-gfx::Rect SystemModalContainerLayoutManager::GetUsableDialogArea() const {
-  // Instead of resizing the system modal container, we move only the modal
-  // windows. This way we avoid flashing lines upon resize animation and if the
-  // keyboard will not fill left to right, the background is still covered.
-  gfx::Rect valid_bounds = container_->GetBounds();
-  keyboard::KeyboardController* keyboard_controller =
-      keyboard::KeyboardController::GetInstance();
-  if (keyboard_controller) {
-    gfx::Rect bounds = keyboard_controller->current_keyboard_bounds();
-    if (!bounds.IsEmpty()) {
-      valid_bounds.set_height(
-          std::max(0, valid_bounds.height() - bounds.height()));
-    }
-  }
-  return valid_bounds;
-}
-
-gfx::Rect SystemModalContainerLayoutManager::GetCenteredAndOrFittedBounds(
-    const WmWindow* window) {
-  gfx::Rect target_bounds;
-  gfx::Rect usable_area = GetUsableDialogArea();
-  if (windows_to_center_.count(window) > 0) {
-    // Keep the dialog centered if it was centered before.
-    target_bounds = usable_area;
-    target_bounds.ClampToCenteredSize(window->GetBounds().size());
-  } else {
-    // Keep the dialog within the usable area.
-    target_bounds = window->GetBounds();
-    target_bounds.AdjustToFit(usable_area);
-  }
-  if (usable_area != container_->GetBounds()) {
-    // Don't clamp the dialog for the keyboard. Keep the size as it is but make
-    // sure that the top remains visible.
-    // TODO(skuhne): M37 should add over scroll functionality to address this.
-    target_bounds.set_size(window->GetBounds().size());
-  }
-  return target_bounds;
-}
-
-bool SystemModalContainerLayoutManager::IsBoundsCentered(
-    const gfx::Rect& bounds) const {
-  gfx::Point window_center = bounds.CenterPoint();
-  gfx::Point container_center = GetUsableDialogArea().CenterPoint();
-  return std::abs(window_center.x() - container_center.x()) <
-             kCenterPixelDelta &&
-         std::abs(window_center.y() - container_center.y()) < kCenterPixelDelta;
-}
-
-}  // namespace ash