chrome/browser/ui/views/toolbar/toolbar_button.cc

   1 // Copyright 2013 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 "chrome/browser/ui/views/toolbar/toolbar_button.h"
   6
   7 #include "base/bind.h"
   8 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
   9 #include "grit/theme_resources.h"
  10 #include "grit/ui_strings.h"
  11 #include "ui/accessibility/ax_view_state.h"
  12 #include "ui/base/l10n/l10n_util.h"
  13 #include "ui/base/models/menu_model.h"
  14 #include "ui/gfx/display.h"
  15 #include "ui/gfx/screen.h"
  16 #include "ui/views/controls/button/label_button_border.h"
  17 #include "ui/views/controls/menu/menu_item_view.h"
  18 #include "ui/views/controls/menu/menu_model_adapter.h"
  19 #include "ui/views/controls/menu/menu_runner.h"
  20 #include "ui/views/widget/widget.h"
  21
  22 ToolbarButton::ToolbarButton(views::ButtonListener* listener,
  23                              ui::MenuModel* model)
  24     : views::LabelButton(listener, base::string16()),
  25       model_(model),
  26       menu_showing_(false),
  27       y_position_on_lbuttondown_(0),
  28       show_menu_factory_(this) {
  29   set_context_menu_controller(this);
  30 }
  31
  32 ToolbarButton::~ToolbarButton() {
  33 }
  34
  35 void ToolbarButton::Init() {
  36   SetFocusable(false);
  37   SetAccessibilityFocusable(true);
  38   image()->EnableCanvasFlippingForRTLUI(true);
  39 }
  40
  41 void ToolbarButton::ClearPendingMenu() {
  42   show_menu_factory_.InvalidateWeakPtrs();
  43 }
  44
  45 bool ToolbarButton::IsMenuShowing() const {
  46   return menu_showing_;
  47 }
  48
  49 gfx::Size ToolbarButton::GetPreferredSize() const {
  50   gfx::Size size(image()->GetPreferredSize());
  51   gfx::Size label_size = label()->GetPreferredSize();
  52   if (label_size.width() > 0)
  53     size.Enlarge(label_size.width() + LocationBarView::kItemPadding, 0);
  54   return size;
  55 }
  56
  57 bool ToolbarButton::OnMousePressed(const ui::MouseEvent& event) {
  58   if (enabled() && ShouldShowMenu() &&
  59       IsTriggerableEvent(event) && HitTestPoint(event.location())) {
  60     // Store the y pos of the mouse coordinates so we can use them later to
  61     // determine if the user dragged the mouse down (which should pop up the
  62     // drag down menu immediately, instead of waiting for the timer)
  63     y_position_on_lbuttondown_ = event.y();
  64
  65     // Schedule a task that will show the menu.
  66     const int kMenuTimerDelay = 500;
  67     base::MessageLoop::current()->PostDelayedTask(
  68         FROM_HERE,
  69         base::Bind(&ToolbarButton::ShowDropDownMenu,
  70                    show_menu_factory_.GetWeakPtr(),
  71                    ui::GetMenuSourceTypeForEvent(event)),
  72         base::TimeDelta::FromMilliseconds(kMenuTimerDelay));
  73   }
  74   return LabelButton::OnMousePressed(event);
  75 }
  76
  77 bool ToolbarButton::OnMouseDragged(const ui::MouseEvent& event) {
  78   bool result = LabelButton::OnMouseDragged(event);
  79
  80   if (show_menu_factory_.HasWeakPtrs()) {
  81     // If the mouse is dragged to a y position lower than where it was when
  82     // clicked then we should not wait for the menu to appear but show
  83     // it immediately.
  84     if (event.y() > y_position_on_lbuttondown_ + GetHorizontalDragThreshold()) {
  85       show_menu_factory_.InvalidateWeakPtrs();
  86       ShowDropDownMenu(ui::GetMenuSourceTypeForEvent(event));
  87     }
  88   }
  89
  90   return result;
  91 }
  92
  93 void ToolbarButton::OnMouseReleased(const ui::MouseEvent& event) {
  94   if (IsTriggerableEvent(event) ||
  95       (event.IsRightMouseButton() && !HitTestPoint(event.location()))) {
  96     LabelButton::OnMouseReleased(event);
  97   }
  98
  99   if (IsTriggerableEvent(event))
 100     show_menu_factory_.InvalidateWeakPtrs();
 101 }
 102
 103 void ToolbarButton::OnMouseCaptureLost() {
 104 }
 105
 106 void ToolbarButton::OnMouseExited(const ui::MouseEvent& event) {
 107   // Starting a drag results in a MouseExited, we need to ignore it.
 108   // A right click release triggers an exit event. We want to
 109   // remain in a PUSHED state until the drop down menu closes.
 110   if (state_ != STATE_DISABLED && !InDrag() && state_ != STATE_PRESSED)
 111     SetState(STATE_NORMAL);
 112 }
 113
 114 void ToolbarButton::OnGestureEvent(ui::GestureEvent* event) {
 115   if (menu_showing_) {
 116     // While dropdown menu is showing the button should not handle gestures.
 117     event->StopPropagation();
 118     return;
 119   }
 120
 121   LabelButton::OnGestureEvent(event);
 122 }
 123
 124 void ToolbarButton::GetAccessibleState(ui::AXViewState* state) {
 125   CustomButton::GetAccessibleState(state);
 126   state->role = ui::AX_ROLE_BUTTON_DROP_DOWN;
 127   state->default_action = l10n_util::GetStringUTF16(IDS_APP_ACCACTION_PRESS);
 128   state->AddStateFlag(ui::AX_STATE_HASPOPUP);
 129 }
 130
 131 void ToolbarButton::ShowContextMenuForView(View* source,
 132                                            const gfx::Point& point,
 133                                            ui::MenuSourceType source_type) {
 134   if (!enabled())
 135     return;
 136
 137   show_menu_factory_.InvalidateWeakPtrs();
 138   ShowDropDownMenu(source_type);
 139 }
 140
 141 bool ToolbarButton::ShouldEnterPushedState(const ui::Event& event) {
 142   // Enter PUSHED state on press with Left or Right mouse button or on taps.
 143   // Remain in this state while the context menu is open.
 144   return event.type() == ui::ET_GESTURE_TAP ||
 145          event.type() == ui::ET_GESTURE_TAP_DOWN ||
 146          (event.IsMouseEvent() && ((ui::EF_LEFT_MOUSE_BUTTON |
 147              ui::EF_RIGHT_MOUSE_BUTTON) & event.flags()) != 0);
 148 }
 149
 150 bool ToolbarButton::ShouldShowMenu() {
 151   return model_ != NULL;
 152 }
 153
 154 void ToolbarButton::ShowDropDownMenu(ui::MenuSourceType source_type) {
 155   if (!ShouldShowMenu())
 156     return;
 157
 158   gfx::Rect lb = GetLocalBounds();
 159
 160   // Both the menu position and the menu anchor type change if the UI layout
 161   // is right-to-left.
 162   gfx::Point menu_position(lb.origin());
 163   menu_position.Offset(0, lb.height() - 1);
 164   if (base::i18n::IsRTL())
 165     menu_position.Offset(lb.width() - 1, 0);
 166
 167   View::ConvertPointToScreen(this, &menu_position);
 168
 169 #if defined(OS_WIN)
 170   int left_bound = GetSystemMetrics(SM_XVIRTUALSCREEN);
 171 #elif defined(OS_CHROMEOS)
 172   // A window won't overlap between displays on ChromeOS.
 173   // Use the left bound of the display on which
 174   // the menu button exists.
 175   gfx::NativeView view = GetWidget()->GetNativeView();
 176   gfx::Display display = gfx::Screen::GetScreenFor(
 177       view)->GetDisplayNearestWindow(view);
 178   int left_bound = display.bounds().x();
 179 #else
 180   // The window might be positioned over the edge between two screens. We'll
 181   // want to position the dropdown on the screen the mouse cursor is on.
 182   gfx::NativeView view = GetWidget()->GetNativeView();
 183   gfx::Screen* screen = gfx::Screen::GetScreenFor(view);
 184   gfx::Display display = screen->GetDisplayNearestPoint(
 185       screen->GetCursorScreenPoint());
 186   int left_bound = display.bounds().x();
 187 #endif
 188   if (menu_position.x() < left_bound)
 189     menu_position.set_x(left_bound);
 190
 191   // Make the button look depressed while the menu is open.
 192   SetState(STATE_PRESSED);
 193
 194   menu_showing_ = true;
 195
 196   // Create and run menu.  Display an empty menu if model is NULL.
 197   if (model_.get()) {
 198     views::MenuModelAdapter menu_delegate(model_.get());
 199     menu_delegate.set_triggerable_event_flags(triggerable_event_flags());
 200     menu_runner_.reset(new views::MenuRunner(menu_delegate.CreateMenu()));
 201     views::MenuRunner::RunResult result =
 202         menu_runner_->RunMenuAt(GetWidget(),
 203                                 NULL,
 204                                 gfx::Rect(menu_position, gfx::Size(0, 0)),
 205                                 views::MENU_ANCHOR_TOPLEFT,
 206                                 source_type,
 207                                 views::MenuRunner::HAS_MNEMONICS);
 208     if (result == views::MenuRunner::MENU_DELETED)
 209       return;
 210   } else {
 211     views::MenuDelegate menu_delegate;
 212     views::MenuItemView* menu = new views::MenuItemView(&menu_delegate);
 213     menu_runner_.reset(new views::MenuRunner(menu));
 214     views::MenuRunner::RunResult result =
 215         menu_runner_->RunMenuAt(GetWidget(),
 216                                 NULL,
 217                                 gfx::Rect(menu_position, gfx::Size(0, 0)),
 218                                 views::MENU_ANCHOR_TOPLEFT,
 219                                 source_type,
 220                                 views::MenuRunner::HAS_MNEMONICS);
 221     if (result == views::MenuRunner::MENU_DELETED)
 222       return;
 223   }
 224
 225   menu_showing_ = false;
 226
 227   // Need to explicitly clear mouse handler so that events get sent
 228   // properly after the menu finishes running. If we don't do this, then
 229   // the first click to other parts of the UI is eaten.
 230   SetMouseHandler(NULL);
 231
 232   // Set the state back to normal after the drop down menu is closed.
 233   if (state_ != STATE_DISABLED)
 234     SetState(STATE_NORMAL);
 235 }