ash/display/cursor_window_controller.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/display/cursor_window_controller.h"
   6
   7 #include "ash/display/display_controller.h"
   8 #include "ash/display/mirror_window_controller.h"
   9 #include "ash/root_window_controller.h"
  10 #include "ash/shell.h"
  11 #include "ash/shell_window_ids.h"
  12 #include "ui/aura/env.h"
  13 #include "ui/aura/window_delegate.h"
  14 #include "ui/aura/window_event_dispatcher.h"
  15 #include "ui/base/cursor/cursors_aura.h"
  16 #include "ui/base/hit_test.h"
  17 #include "ui/base/resource/resource_bundle.h"
  18 #include "ui/compositor/dip_util.h"
  19 #include "ui/gfx/canvas.h"
  20 #include "ui/gfx/display.h"
  21 #include "ui/gfx/image/image_skia.h"
  22 #include "ui/gfx/image/image_skia_operations.h"
  23
  24 namespace ash {
  25
  26 class CursorWindowDelegate : public aura::WindowDelegate {
  27  public:
  28   CursorWindowDelegate() : is_cursor_compositing_enabled_(false) {}
  29   ~CursorWindowDelegate() override {}
  30
  31   // aura::WindowDelegate overrides:
  32   gfx::Size GetMinimumSize() const override { return size_; }
  33   gfx::Size GetMaximumSize() const override { return size_; }
  34   void OnBoundsChanged(const gfx::Rect& old_bounds,
  35                        const gfx::Rect& new_bounds) override {}
  36   gfx::NativeCursor GetCursor(const gfx::Point& point) override {
  37     return gfx::kNullCursor;
  38   }
  39   int GetNonClientComponent(const gfx::Point& point) const override {
  40     return HTNOWHERE;
  41   }
  42   bool ShouldDescendIntoChildForEventHandling(
  43       aura::Window* child,
  44       const gfx::Point& location) override {
  45     return false;
  46   }
  47   bool CanFocus() override { return false; }
  48   void OnCaptureLost() override {}
  49   void OnPaint(gfx::Canvas* canvas) override {
  50     canvas->DrawImageInt(cursor_image_, 0, 0);
  51   }
  52   void OnDeviceScaleFactorChanged(float device_scale_factor) override {}
  53   void OnWindowDestroying(aura::Window* window) override {}
  54   void OnWindowDestroyed(aura::Window* window) override {}
  55   void OnWindowTargetVisibilityChanged(bool visible) override {}
  56   bool HasHitTestMask() const override { return false; }
  57   void GetHitTestMask(gfx::Path* mask) const override {}
  58
  59   // Sets cursor compositing mode on/off.
  60   void SetCursorCompositingEnabled(bool enabled) {
  61     is_cursor_compositing_enabled_ = enabled;
  62   }
  63
  64   // Sets the cursor image for the |display|'s scale factor.
  65   void SetCursorImage(const gfx::ImageSkia& image,
  66                       const gfx::Display& display) {
  67     float scale_factor = display.device_scale_factor();
  68     const gfx::ImageSkiaRep& image_rep = image.GetRepresentation(scale_factor);
  69     if (!is_cursor_compositing_enabled_) {
  70       // Note that mirror window's scale factor is always 1.0f, therefore we
  71       // need to take 2x's image and paint as if it's 1x image.
  72       size_ = image_rep.pixel_size();
  73       cursor_image_ = gfx::ImageSkia::CreateFrom1xBitmap(image_rep.sk_bitmap());
  74     } else {
  75       size_ = image.size();
  76       cursor_image_ = gfx::ImageSkia(
  77           gfx::ImageSkiaRep(image_rep.sk_bitmap(), scale_factor));
  78     }
  79   }
  80
  81   const gfx::Size size() const { return size_; }
  82
  83  private:
  84   bool is_cursor_compositing_enabled_;
  85   gfx::ImageSkia cursor_image_;
  86   gfx::Size size_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(CursorWindowDelegate);
  89 };
  90
  91 CursorWindowController::CursorWindowController()
  92     : is_cursor_compositing_enabled_(false),
  93       container_(NULL),
  94       cursor_type_(ui::kCursorNone),
  95       cursor_set_(ui::CURSOR_SET_NORMAL),
  96       cursor_rotation_(gfx::Display::ROTATE_0),
  97       delegate_(new CursorWindowDelegate()) {
  98 }
  99
 100 CursorWindowController::~CursorWindowController() {
 101   SetContainer(NULL);
 102 }
 103
 104 void CursorWindowController::SetCursorCompositingEnabled(bool enabled) {
 105   if (is_cursor_compositing_enabled_ != enabled) {
 106     is_cursor_compositing_enabled_ = enabled;
 107     delegate_->SetCursorCompositingEnabled(enabled);
 108     UpdateCursorImage();
 109     UpdateContainer();
 110   }
 111 }
 112
 113 void CursorWindowController::UpdateContainer() {
 114   if (is_cursor_compositing_enabled_) {
 115     gfx::Screen* screen = Shell::GetScreen();
 116     gfx::Display display = screen->GetDisplayNearestPoint(
 117         screen->GetCursorScreenPoint());
 118     DCHECK(display.is_valid());
 119     if (display.is_valid())
 120       SetDisplay(display);
 121   } else {
 122     aura::Window* mirror_window = Shell::GetInstance()->
 123         display_controller()->
 124         mirror_window_controller()->
 125         GetWindow();
 126     if (mirror_window)
 127       display_ = Shell::GetScreen()->GetPrimaryDisplay();
 128     SetContainer(mirror_window);
 129   }
 130   // Updates the hot point based on the current display/container.
 131   UpdateCursorImage();
 132 }
 133
 134 void CursorWindowController::SetDisplay(const gfx::Display& display) {
 135   if (!is_cursor_compositing_enabled_)
 136     return;
 137
 138   display_ = display;
 139   aura::Window* root_window = Shell::GetInstance()->display_controller()->
 140       GetRootWindowForDisplayId(display.id());
 141   if (!root_window)
 142     return;
 143
 144   SetContainer(GetRootWindowController(root_window)->GetContainer(
 145       kShellWindowId_MouseCursorContainer));
 146   SetBoundsInScreen(display.bounds());
 147 }
 148
 149 void CursorWindowController::UpdateLocation() {
 150   if (!cursor_window_)
 151     return;
 152   gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
 153   if (!is_cursor_compositing_enabled_) {
 154     Shell::GetPrimaryRootWindow()->GetHost()->ConvertPointToHost(&point);
 155   } else {
 156     point.Offset(-bounds_in_screen_.x(), -bounds_in_screen_.y());
 157   }
 158   point.Offset(-hot_point_.x(), -hot_point_.y());
 159   gfx::Rect bounds = cursor_window_->bounds();
 160   bounds.set_origin(point);
 161   cursor_window_->SetBounds(bounds);
 162 }
 163
 164 void CursorWindowController::SetCursor(gfx::NativeCursor cursor) {
 165   if (cursor_type_ == cursor.native_type() &&
 166       cursor_rotation_ == display_.rotation())
 167     return;
 168   cursor_type_ = cursor.native_type();
 169   cursor_rotation_ = display_.rotation();
 170   UpdateCursorImage();
 171 }
 172
 173 void CursorWindowController::SetCursorSet(ui::CursorSetType cursor_set) {
 174   cursor_set_ = cursor_set;
 175   UpdateCursorImage();
 176 }
 177
 178 void CursorWindowController::SetVisibility(bool visible) {
 179   if (!cursor_window_)
 180     return;
 181   if (visible)
 182     cursor_window_->Show();
 183   else
 184     cursor_window_->Hide();
 185 }
 186
 187 void CursorWindowController::SetContainer(aura::Window* container) {
 188   if (container_ == container)
 189     return;
 190   container_ = container;
 191   if (!container) {
 192     cursor_window_.reset();
 193     return;
 194   }
 195
 196   // Reusing the window does not work when the display is disconnected.
 197   // Just creates a new one instead. crbug.com/384218.
 198   cursor_window_.reset(new aura::Window(delegate_.get()));
 199   cursor_window_->SetTransparent(true);
 200   cursor_window_->Init(aura::WINDOW_LAYER_TEXTURED);
 201   cursor_window_->set_ignore_events(true);
 202   cursor_window_->set_owned_by_parent(false);
 203   UpdateCursorImage();
 204
 205   container->AddChild(cursor_window_.get());
 206   cursor_window_->Show();
 207   SetBoundsInScreen(container->bounds());
 208 }
 209
 210 void CursorWindowController::SetBoundsInScreen(const gfx::Rect& bounds) {
 211   bounds_in_screen_ = bounds;
 212   UpdateLocation();
 213 }
 214
 215 void CursorWindowController::UpdateCursorImage() {
 216   int resource_id;
 217   // TODO(hshi): support custom cursor set.
 218   if (!ui::GetCursorDataFor(cursor_set_,
 219                             cursor_type_,
 220                             display_.device_scale_factor(),
 221                             &resource_id,
 222                             &hot_point_)) {
 223     return;
 224   }
 225   const gfx::ImageSkia* image =
 226       ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
 227   gfx::ImageSkia rotated = *image;
 228   if (!is_cursor_compositing_enabled_) {
 229     switch (cursor_rotation_) {
 230       case gfx::Display::ROTATE_0:
 231         break;
 232       case gfx::Display::ROTATE_90:
 233         rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
 234             *image, SkBitmapOperations::ROTATION_90_CW);
 235         hot_point_.SetPoint(
 236             rotated.width() - hot_point_.y(),
 237             hot_point_.x());
 238         break;
 239       case gfx::Display::ROTATE_180:
 240         rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
 241             *image, SkBitmapOperations::ROTATION_180_CW);
 242         hot_point_.SetPoint(
 243             rotated.height() - hot_point_.x(),
 244             rotated.width() - hot_point_.y());
 245         break;
 246       case gfx::Display::ROTATE_270:
 247         rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
 248             *image, SkBitmapOperations::ROTATION_270_CW);
 249         hot_point_.SetPoint(
 250             hot_point_.y(),
 251             rotated.height() - hot_point_.x());
 252         break;
 253     }
 254   } else {
 255     hot_point_ = ui::ConvertPointToDIP(Shell::GetPrimaryRootWindow()->layer(),
 256                                        hot_point_);
 257   }
 258   delegate_->SetCursorImage(rotated, display_);
 259   if (cursor_window_) {
 260     cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
 261     cursor_window_->SchedulePaintInRect(
 262         gfx::Rect(cursor_window_->bounds().size()));
 263     UpdateLocation();
 264   }
 265 }
 266
 267 }  // namespace ash