ui/views/controls/button/custom_button.cc

   1 // Copyright (c) 2012 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 "ui/views/controls/button/custom_button.h"
   6
   7 #include "ui/accessibility/ax_view_state.h"
   8 #include "ui/events/event.h"
   9 #include "ui/events/event_utils.h"
  10 #include "ui/events/keycodes/keyboard_codes.h"
  11 #include "ui/gfx/animation/throb_animation.h"
  12 #include "ui/gfx/screen.h"
  13 #include "ui/views/controls/button/blue_button.h"
  14 #include "ui/views/controls/button/checkbox.h"
  15 #include "ui/views/controls/button/image_button.h"
  16 #include "ui/views/controls/button/label_button.h"
  17 #include "ui/views/controls/button/menu_button.h"
  18 #include "ui/views/controls/button/radio_button.h"
  19 #include "ui/views/widget/widget.h"
  20
  21 namespace views {
  22
  23 // How long the hover animation takes if uninterrupted.
  24 static const int kHoverFadeDurationMs = 150;
  25
  26 // static
  27 const char CustomButton::kViewClassName[] = "CustomButton";
  28
  29 ////////////////////////////////////////////////////////////////////////////////
  30 // CustomButton, public:
  31
  32 // static
  33 const CustomButton* CustomButton::AsCustomButton(const views::View* view) {
  34   return AsCustomButton(const_cast<views::View*>(view));
  35 }
  36
  37 CustomButton* CustomButton::AsCustomButton(views::View* view) {
  38   if (view) {
  39     const char* classname = view->GetClassName();
  40     if (!strcmp(classname, Checkbox::kViewClassName) ||
  41         !strcmp(classname, CustomButton::kViewClassName) ||
  42         !strcmp(classname, ImageButton::kViewClassName) ||
  43         !strcmp(classname, LabelButton::kViewClassName) ||
  44         !strcmp(classname, RadioButton::kViewClassName) ||
  45         !strcmp(classname, MenuButton::kViewClassName)) {
  46       return static_cast<CustomButton*>(view);
  47     }
  48   }
  49   return NULL;
  50 }
  51
  52 CustomButton::~CustomButton() {
  53 }
  54
  55 void CustomButton::SetState(ButtonState state) {
  56   if (state == state_)
  57     return;
  58
  59   if (animate_on_state_change_ &&
  60       (!is_throbbing_ || !hover_animation_->is_animating())) {
  61     is_throbbing_ = false;
  62     if (state_ == STATE_NORMAL && state == STATE_HOVERED) {
  63       // Button is hovered from a normal state, start hover animation.
  64       hover_animation_->Show();
  65     } else if ((state_ == STATE_HOVERED || state_ == STATE_PRESSED)
  66           && state == STATE_NORMAL) {
  67       // Button is returning to a normal state from hover, start hover
  68       // fade animation.
  69       hover_animation_->Hide();
  70     } else {
  71       hover_animation_->Stop();
  72     }
  73   }
  74
  75   state_ = state;
  76   StateChanged();
  77   SchedulePaint();
  78 }
  79
  80 void CustomButton::StartThrobbing(int cycles_til_stop) {
  81   is_throbbing_ = true;
  82   hover_animation_->StartThrobbing(cycles_til_stop);
  83 }
  84
  85 void CustomButton::StopThrobbing() {
  86   if (hover_animation_->is_animating()) {
  87     hover_animation_->Stop();
  88     SchedulePaint();
  89   }
  90 }
  91
  92 void CustomButton::SetAnimationDuration(int duration) {
  93   hover_animation_->SetSlideDuration(duration);
  94 }
  95
  96 void CustomButton::SetHotTracked(bool is_hot_tracked) {
  97   if (state_ != STATE_DISABLED)
  98     SetState(is_hot_tracked ? STATE_HOVERED : STATE_NORMAL);
  99
 100   if (is_hot_tracked)
 101     NotifyAccessibilityEvent(ui::AX_EVENT_FOCUS, true);
 102 }
 103
 104 bool CustomButton::IsHotTracked() const {
 105   return state_ == STATE_HOVERED;
 106 }
 107
 108 ////////////////////////////////////////////////////////////////////////////////
 109 // CustomButton, View overrides:
 110
 111 void CustomButton::OnEnabledChanged() {
 112   if (enabled() ? (state_ != STATE_DISABLED) : (state_ == STATE_DISABLED))
 113     return;
 114
 115   if (enabled())
 116     SetState(IsMouseHovered() ? STATE_HOVERED : STATE_NORMAL);
 117   else
 118     SetState(STATE_DISABLED);
 119 }
 120
 121 const char* CustomButton::GetClassName() const {
 122   return kViewClassName;
 123 }
 124
 125 bool CustomButton::OnMousePressed(const ui::MouseEvent& event) {
 126   if (state_ != STATE_DISABLED) {
 127     if (ShouldEnterPushedState(event) && HitTestPoint(event.location()))
 128       SetState(STATE_PRESSED);
 129     if (request_focus_on_press_)
 130       RequestFocus();
 131   }
 132   return true;
 133 }
 134
 135 bool CustomButton::OnMouseDragged(const ui::MouseEvent& event) {
 136   if (state_ != STATE_DISABLED) {
 137     if (HitTestPoint(event.location()))
 138       SetState(ShouldEnterPushedState(event) ? STATE_PRESSED : STATE_HOVERED);
 139     else
 140       SetState(STATE_NORMAL);
 141   }
 142   return true;
 143 }
 144
 145 void CustomButton::OnMouseReleased(const ui::MouseEvent& event) {
 146   if (state_ == STATE_DISABLED)
 147     return;
 148
 149   if (!HitTestPoint(event.location())) {
 150     SetState(STATE_NORMAL);
 151     return;
 152   }
 153
 154   SetState(STATE_HOVERED);
 155   if (IsTriggerableEvent(event)) {
 156     NotifyClick(event);
 157     // NOTE: We may be deleted at this point (by the listener's notification
 158     // handler).
 159   }
 160 }
 161
 162 void CustomButton::OnMouseCaptureLost() {
 163   // Starting a drag results in a MouseCaptureLost, we need to ignore it.
 164   if (state_ != STATE_DISABLED && !InDrag())
 165     SetState(STATE_NORMAL);
 166 }
 167
 168 void CustomButton::OnMouseEntered(const ui::MouseEvent& event) {
 169   if (state_ != STATE_DISABLED)
 170     SetState(STATE_HOVERED);
 171 }
 172
 173 void CustomButton::OnMouseExited(const ui::MouseEvent& event) {
 174   // Starting a drag results in a MouseExited, we need to ignore it.
 175   if (state_ != STATE_DISABLED && !InDrag())
 176     SetState(STATE_NORMAL);
 177 }
 178
 179 void CustomButton::OnMouseMoved(const ui::MouseEvent& event) {
 180   if (state_ != STATE_DISABLED)
 181     SetState(HitTestPoint(event.location()) ? STATE_HOVERED : STATE_NORMAL);
 182 }
 183
 184 bool CustomButton::OnKeyPressed(const ui::KeyEvent& event) {
 185   if (state_ == STATE_DISABLED)
 186     return false;
 187
 188   // Space sets button state to pushed. Enter clicks the button. This matches
 189   // the Windows native behavior of buttons, where Space clicks the button on
 190   // KeyRelease and Enter clicks the button on KeyPressed.
 191   if (event.key_code() == ui::VKEY_SPACE) {
 192     SetState(STATE_PRESSED);
 193   } else if (event.key_code() == ui::VKEY_RETURN) {
 194     SetState(STATE_NORMAL);
 195     // TODO(beng): remove once NotifyClick takes ui::Event.
 196     ui::MouseEvent synthetic_event(ui::ET_MOUSE_RELEASED, gfx::Point(),
 197                                    gfx::Point(), ui::EventTimeForNow(),
 198                                    ui::EF_LEFT_MOUSE_BUTTON,
 199                                    ui::EF_LEFT_MOUSE_BUTTON);
 200     NotifyClick(synthetic_event);
 201   } else {
 202     return false;
 203   }
 204   return true;
 205 }
 206
 207 bool CustomButton::OnKeyReleased(const ui::KeyEvent& event) {
 208   if ((state_ == STATE_DISABLED) || (event.key_code() != ui::VKEY_SPACE))
 209     return false;
 210
 211   SetState(STATE_NORMAL);
 212   // TODO(beng): remove once NotifyClick takes ui::Event.
 213   ui::MouseEvent synthetic_event(
 214       ui::ET_MOUSE_RELEASED, gfx::Point(), gfx::Point(), ui::EventTimeForNow(),
 215       ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON);
 216   NotifyClick(synthetic_event);
 217   return true;
 218 }
 219
 220 void CustomButton::OnGestureEvent(ui::GestureEvent* event) {
 221   if (state_ == STATE_DISABLED) {
 222     Button::OnGestureEvent(event);
 223     return;
 224   }
 225
 226   if (event->type() == ui::ET_GESTURE_TAP && IsTriggerableEvent(*event)) {
 227     // Set the button state to hot and start the animation fully faded in. The
 228     // GESTURE_END event issued immediately after will set the state to
 229     // STATE_NORMAL beginning the fade out animation. See
 230     // http://crbug.com/131184.
 231     SetState(STATE_HOVERED);
 232     hover_animation_->Reset(1.0);
 233     NotifyClick(*event);
 234     event->StopPropagation();
 235   } else if (event->type() == ui::ET_GESTURE_TAP_DOWN &&
 236              ShouldEnterPushedState(*event)) {
 237     SetState(STATE_PRESSED);
 238     if (request_focus_on_press_)
 239       RequestFocus();
 240     event->StopPropagation();
 241   } else if (event->type() == ui::ET_GESTURE_TAP_CANCEL ||
 242              event->type() == ui::ET_GESTURE_END) {
 243     SetState(STATE_NORMAL);
 244   }
 245   if (!event->handled())
 246     Button::OnGestureEvent(event);
 247 }
 248
 249 bool CustomButton::AcceleratorPressed(const ui::Accelerator& accelerator) {
 250   SetState(STATE_NORMAL);
 251   // TODO(beng): remove once NotifyClick takes ui::Event.
 252   ui::MouseEvent synthetic_event(
 253       ui::ET_MOUSE_RELEASED, gfx::Point(), gfx::Point(), ui::EventTimeForNow(),
 254       ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON);
 255   NotifyClick(synthetic_event);
 256   return true;
 257 }
 258
 259 void CustomButton::ShowContextMenu(const gfx::Point& p,
 260                                    ui::MenuSourceType source_type) {
 261   if (!context_menu_controller())
 262     return;
 263
 264   // We're about to show the context menu. Showing the context menu likely means
 265   // we won't get a mouse exited and reset state. Reset it now to be sure.
 266   if (state_ != STATE_DISABLED)
 267     SetState(STATE_NORMAL);
 268   View::ShowContextMenu(p, source_type);
 269 }
 270
 271 void CustomButton::OnDragDone() {
 272   // Only reset the state to normal if the button isn't currently disabled
 273   // (since disabled buttons may still be able to be dragged).
 274   if (state_ != STATE_DISABLED)
 275     SetState(STATE_NORMAL);
 276 }
 277
 278 void CustomButton::GetAccessibleState(ui::AXViewState* state) {
 279   Button::GetAccessibleState(state);
 280   switch (state_) {
 281     case STATE_HOVERED:
 282       state->AddStateFlag(ui::AX_STATE_HOVERED);
 283       break;
 284     case STATE_PRESSED:
 285       state->AddStateFlag(ui::AX_STATE_PRESSED);
 286       break;
 287     case STATE_DISABLED:
 288       state->AddStateFlag(ui::AX_STATE_DISABLED);
 289       break;
 290     case STATE_NORMAL:
 291     case STATE_COUNT:
 292       // No additional accessibility state set for this button state.
 293       break;
 294   }
 295 }
 296
 297 void CustomButton::VisibilityChanged(View* starting_from, bool visible) {
 298   if (state_ == STATE_DISABLED)
 299     return;
 300   SetState(visible && IsMouseHovered() ? STATE_HOVERED : STATE_NORMAL);
 301 }
 302
 303 ////////////////////////////////////////////////////////////////////////////////
 304 // CustomButton, gfx::AnimationDelegate implementation:
 305
 306 void CustomButton::AnimationProgressed(const gfx::Animation* animation) {
 307   SchedulePaint();
 308 }
 309
 310 ////////////////////////////////////////////////////////////////////////////////
 311 // CustomButton, protected:
 312
 313 CustomButton::CustomButton(ButtonListener* listener)
 314     : Button(listener),
 315       state_(STATE_NORMAL),
 316       animate_on_state_change_(true),
 317       is_throbbing_(false),
 318       triggerable_event_flags_(ui::EF_LEFT_MOUSE_BUTTON),
 319       request_focus_on_press_(true) {
 320   hover_animation_.reset(new gfx::ThrobAnimation(this));
 321   hover_animation_->SetSlideDuration(kHoverFadeDurationMs);
 322 }
 323
 324 void CustomButton::StateChanged() {
 325 }
 326
 327 bool CustomButton::IsTriggerableEvent(const ui::Event& event) {
 328   return event.type() == ui::ET_GESTURE_TAP_DOWN ||
 329          event.type() == ui::ET_GESTURE_TAP ||
 330          (event.IsMouseEvent() &&
 331              (triggerable_event_flags_ & event.flags()) != 0);
 332 }
 333
 334 bool CustomButton::ShouldEnterPushedState(const ui::Event& event) {
 335   return IsTriggerableEvent(event);
 336 }
 337
 338 ////////////////////////////////////////////////////////////////////////////////
 339 // CustomButton, View overrides (protected):
 340
 341 void CustomButton::ViewHierarchyChanged(
 342     const ViewHierarchyChangedDetails& details) {
 343   if (!details.is_add && state_ != STATE_DISABLED)
 344     SetState(STATE_NORMAL);
 345 }
 346
 347 void CustomButton::OnBlur() {
 348   if (IsHotTracked())
 349     SetState(STATE_NORMAL);
 350 }
 351
 352 }  // namespace views