root/ash/wm/window_util.cc

DEFINITIONS

1. GetDefaultSnappedWindowWidth
2. ActivateWindow
3. DeactivateWindow
4. IsActiveWindow
5. GetActiveWindow
6. GetActivatableWindow
7. CanActivateWindow
8. IsWindowMinimized
9. CenterWindow
10. GetDefaultLeftSnappedWindowBoundsInParent
11. GetDefaultRightSnappedWindowBoundsInParent
12. AdjustBoundsSmallerThan
13. AdjustBoundsToEnsureMinimumWindowVisibility
14. AdjustBoundsToEnsureWindowVisibility
15. MoveWindowToEventRoot
16. ReparentChildWithTransientChildren
17. ReparentTransientChildrenOfChild

// 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/window_util.h"

#include <vector>

#include "ash/ash_constants.h"
#include "ash/screen_util.h"
#include "ash/shell.h"
#include "ash/wm/window_properties.h"
#include "ash/wm/window_state.h"
#include "ash/wm/wm_event.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/window.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/gfx/display.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/screen.h"
#include "ui/gfx/size.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/core/window_util.h"
#include "ui/wm/public/activation_client.h"

namespace ash {
namespace wm {

namespace {

// Returns the default width of a snapped window.
int GetDefaultSnappedWindowWidth(aura::Window* window) {
  const float kSnappedWidthWorkspaceRatio = 0.5f;

  int work_area_width =
      ScreenUtil::GetDisplayWorkAreaBoundsInParent(window).width();
  int min_width = window->delegate() ?
      window->delegate()->GetMinimumSize().width() : 0;
  int ideal_width =
      static_cast<int>(work_area_width * kSnappedWidthWorkspaceRatio);
  return std::min(work_area_width, std::max(ideal_width, min_width));
}

}  // namespace

// TODO(beng): replace many of these functions with the corewm versions.
void ActivateWindow(aura::Window* window) {
  ::wm::ActivateWindow(window);
}

void DeactivateWindow(aura::Window* window) {
  ::wm::DeactivateWindow(window);
}

bool IsActiveWindow(aura::Window* window) {
  return ::wm::IsActiveWindow(window);
}

aura::Window* GetActiveWindow() {
  return aura::client::GetActivationClient(Shell::GetPrimaryRootWindow())->
      GetActiveWindow();
}

aura::Window* GetActivatableWindow(aura::Window* window) {
  return ::wm::GetActivatableWindow(window);
}

bool CanActivateWindow(aura::Window* window) {
  return ::wm::CanActivateWindow(window);
}

bool IsWindowMinimized(aura::Window* window) {
  return ash::wm::GetWindowState(window)->IsMinimized();
}

void CenterWindow(aura::Window* window) {
  wm::WMEvent event(wm::WM_EVENT_CENTER);
  wm::GetWindowState(window)->OnWMEvent(&event);
}

gfx::Rect GetDefaultLeftSnappedWindowBoundsInParent(aura::Window* window) {
  gfx::Rect work_area_in_parent(ScreenUtil::GetDisplayWorkAreaBoundsInParent(
      window));
  return gfx::Rect(work_area_in_parent.x(),
                   work_area_in_parent.y(),
                   GetDefaultSnappedWindowWidth(window),
                   work_area_in_parent.height());
}

gfx::Rect GetDefaultRightSnappedWindowBoundsInParent(aura::Window* window) {
  gfx::Rect work_area_in_parent(ScreenUtil::GetDisplayWorkAreaBoundsInParent(
      window));
  int width = GetDefaultSnappedWindowWidth(window);
  return gfx::Rect(work_area_in_parent.right() - width,
                   work_area_in_parent.y(),
                   width,
                   work_area_in_parent.height());
}

void AdjustBoundsSmallerThan(const gfx::Size& max_size, gfx::Rect* bounds) {
  bounds->set_width(std::min(bounds->width(), max_size.width()));
  bounds->set_height(std::min(bounds->height(), max_size.height()));
}

void AdjustBoundsToEnsureMinimumWindowVisibility(const gfx::Rect& visible_area,
                                                 gfx::Rect* bounds) {
  AdjustBoundsToEnsureWindowVisibility(
      visible_area, kMinimumOnScreenArea, kMinimumOnScreenArea, bounds);
}

void AdjustBoundsToEnsureWindowVisibility(const gfx::Rect& visible_area,
                                          int min_width,
                                          int min_height,
                                          gfx::Rect* bounds) {
  AdjustBoundsSmallerThan(visible_area.size(), bounds);

  min_width = std::min(min_width, visible_area.width());
  min_height = std::min(min_height, visible_area.height());

  if (bounds->right() < visible_area.x() + min_width) {
    bounds->set_x(visible_area.x() + min_width - bounds->width());
  } else if (bounds->x() > visible_area.right() - min_width) {
    bounds->set_x(visible_area.right() - min_width);
  }
  if (bounds->bottom() < visible_area.y() + min_height) {
    bounds->set_y(visible_area.y() + min_height - bounds->height());
  } else if (bounds->y() > visible_area.bottom() - min_height) {
    bounds->set_y(visible_area.bottom() - min_height);
  }
  if (bounds->y() < visible_area.y())
    bounds->set_y(visible_area.y());
}

bool MoveWindowToEventRoot(aura::Window* window, const ui::Event& event) {
  views::View* target = static_cast<views::View*>(event.target());
  if (!target)
    return false;
  aura::Window* target_root =
      target->GetWidget()->GetNativeView()->GetRootWindow();
  if (!target_root || target_root == window->GetRootWindow())
    return false;
  aura::Window* window_container =
      ash::Shell::GetContainer(target_root, window->parent()->id());
  // Move the window to the target launcher.
  window_container->AddChild(window);
  return true;
}

void ReparentChildWithTransientChildren(aura::Window* child,
                                        aura::Window* old_parent,
                                        aura::Window* new_parent) {
  if (child->parent() == old_parent)
    new_parent->AddChild(child);
  ReparentTransientChildrenOfChild(child, old_parent, new_parent);
}

void ReparentTransientChildrenOfChild(aura::Window* child,
                                      aura::Window* old_parent,
                                      aura::Window* new_parent) {
  for (size_t i = 0;
       i < ::wm::GetTransientChildren(child).size();
       ++i) {
    ReparentChildWithTransientChildren(
        ::wm::GetTransientChildren(child)[i],
        old_parent,
        new_parent);
  }
}

}  // namespace wm
}  // namespace ash