chrome/browser/ui/views/dropdown_bar_host.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 "chrome/browser/ui/views/dropdown_bar_host.h"
   6
   7 #include <algorithm>
   8
   9 #include "chrome/browser/ui/view_ids.h"
  10 #include "chrome/browser/ui/views/dropdown_bar_host_delegate.h"
  11 #include "chrome/browser/ui/views/dropdown_bar_view.h"
  12 #include "chrome/browser/ui/views/frame/browser_view.h"
  13 #include "ui/events/keycodes/keyboard_codes.h"
  14 #include "ui/gfx/animation/slide_animation.h"
  15 #include "ui/gfx/scrollbar_size.h"
  16 #include "ui/views/focus/external_focus_tracker.h"
  17 #include "ui/views/focus/view_storage.h"
  18 #include "ui/views/widget/widget.h"
  19
  20 // static
  21 bool DropdownBarHost::disable_animations_during_testing_ = false;
  22
  23 ////////////////////////////////////////////////////////////////////////////////
  24 // DropdownBarHost, public:
  25
  26 DropdownBarHost::DropdownBarHost(BrowserView* browser_view)
  27     : browser_view_(browser_view),
  28       view_(NULL),
  29       delegate_(NULL),
  30       animation_offset_(0),
  31       focus_manager_(NULL),
  32       esc_accel_target_registered_(false),
  33       is_visible_(false) {
  34 }
  35
  36 void DropdownBarHost::Init(views::View* host_view,
  37                            views::View* view,
  38                            DropdownBarHostDelegate* delegate) {
  39   DCHECK(view);
  40   DCHECK(delegate);
  41
  42   view_ = view;
  43   delegate_ = delegate;
  44
  45   // Initialize the host.
  46   host_.reset(new views::Widget);
  47   views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
  48   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
  49   params.parent = browser_view_->GetWidget()->GetNativeView();
  50   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
  51   host_->Init(params);
  52   host_->SetContentsView(view_);
  53
  54   SetHostViewNative(host_view);
  55
  56   // Start listening to focus changes, so we can register and unregister our
  57   // own handler for Escape.
  58   focus_manager_ = host_->GetFocusManager();
  59   if (focus_manager_) {
  60     focus_manager_->AddFocusChangeListener(this);
  61   } else {
  62     // In some cases (see bug http://crbug.com/17056) it seems we may not have
  63     // a focus manager.  Please reopen the bug if you hit this.
  64     NOTREACHED();
  65   }
  66
  67   // Start the process of animating the opening of the widget.
  68   animation_.reset(new gfx::SlideAnimation(this));
  69 }
  70
  71 DropdownBarHost::~DropdownBarHost() {
  72   focus_manager_->RemoveFocusChangeListener(this);
  73   focus_tracker_.reset(NULL);
  74 }
  75
  76 void DropdownBarHost::Show(bool animate) {
  77   // Stores the currently focused view, and tracks focus changes so that we can
  78   // restore focus when the dropdown widget is closed.
  79   focus_tracker_.reset(new views::ExternalFocusTracker(view_, focus_manager_));
  80
  81   bool was_visible = is_visible_;
  82   is_visible_ = true;
  83   if (!animate || disable_animations_during_testing_) {
  84     animation_->Reset(1);
  85     AnimationProgressed(animation_.get());
  86   } else if (!was_visible) {
  87     // Don't re-start the animation.
  88     animation_->Reset();
  89     animation_->Show();
  90   }
  91
  92   if (!was_visible)
  93     OnVisibilityChanged();
  94 }
  95
  96 void DropdownBarHost::SetFocusAndSelection() {
  97   delegate_->SetFocusAndSelection(true);
  98 }
  99
 100 bool DropdownBarHost::IsAnimating() const {
 101   return animation_->is_animating();
 102 }
 103
 104 void DropdownBarHost::Hide(bool animate) {
 105   if (!IsVisible())
 106     return;
 107   if (animate && !disable_animations_during_testing_ &&
 108       !animation_->IsClosing()) {
 109     animation_->Hide();
 110   } else {
 111     if (animation_->IsClosing()) {
 112       // If we're in the middle of a close animation, skip immediately to the
 113       // end of the animation.
 114       StopAnimation();
 115     } else {
 116       // Otherwise we need to set both the animation state to ended and the
 117       // DropdownBarHost state to ended/hidden, otherwise the next time we try
 118       // to show the bar, it might refuse to do so. Note that we call
 119       // AnimationEnded ourselves as Reset does not call it if we are not
 120       // animating here.
 121       animation_->Reset();
 122       AnimationEnded(animation_.get());
 123     }
 124   }
 125 }
 126
 127 void DropdownBarHost::StopAnimation() {
 128   animation_->End();
 129 }
 130
 131 bool DropdownBarHost::IsVisible() const {
 132   return is_visible_;
 133 }
 134
 135 ////////////////////////////////////////////////////////////////////////////////
 136 // DropdownBarHost, views::FocusChangeListener implementation:
 137 void DropdownBarHost::OnWillChangeFocus(views::View* focused_before,
 138                                         views::View* focused_now) {
 139   // First we need to determine if one or both of the views passed in are child
 140   // views of our view.
 141   bool our_view_before = focused_before && view_->Contains(focused_before);
 142   bool our_view_now = focused_now && view_->Contains(focused_now);
 143
 144   // When both our_view_before and our_view_now are false, it means focus is
 145   // changing hands elsewhere in the application (and we shouldn't do anything).
 146   // Similarly, when both are true, focus is changing hands within the dropdown
 147   // widget (and again, we should not do anything). We therefore only need to
 148   // look at when we gain initial focus and when we loose it.
 149   if (!our_view_before && our_view_now) {
 150     // We are gaining focus from outside the dropdown widget so we must register
 151     // a handler for Escape.
 152     RegisterAccelerators();
 153   } else if (our_view_before && !our_view_now) {
 154     // We are losing focus to something outside our widget so we restore the
 155     // original handler for Escape.
 156     UnregisterAccelerators();
 157   }
 158 }
 159
 160 void DropdownBarHost::OnDidChangeFocus(views::View* focused_before,
 161                                        views::View* focused_now) {
 162 }
 163
 164 ////////////////////////////////////////////////////////////////////////////////
 165 // DropdownBarHost, gfx::AnimationDelegate implementation:
 166
 167 void DropdownBarHost::AnimationProgressed(const gfx::Animation* animation) {
 168   // First, we calculate how many pixels to slide the widget.
 169   gfx::Size pref_size = view_->GetPreferredSize();
 170   animation_offset_ = static_cast<int>((1.0 - animation_->GetCurrentValue()) *
 171                                        pref_size.height());
 172
 173   // This call makes sure it appears in the right location, the size and shape
 174   // is correct and that it slides in the right direction.
 175   gfx::Rect dlg_rect = GetDialogPosition(gfx::Rect());
 176   SetDialogPosition(dlg_rect);
 177
 178   // Let the view know if we are animating, and at which offset to draw the
 179   // edges.
 180   delegate_->SetAnimationOffset(animation_offset_);
 181   view_->SchedulePaint();
 182 }
 183
 184 void DropdownBarHost::AnimationEnded(const gfx::Animation* animation) {
 185   // Place the dropdown widget in its fully opened state.
 186   animation_offset_ = 0;
 187
 188   if (!animation_->IsShowing()) {
 189     // Animation has finished closing.
 190     host_->Hide();
 191     is_visible_ = false;
 192     OnVisibilityChanged();
 193   } else {
 194     // Animation has finished opening.
 195   }
 196 }
 197
 198 ////////////////////////////////////////////////////////////////////////////////
 199 // DropdownBarHost protected:
 200
 201 void DropdownBarHost::ResetFocusTracker() {
 202   focus_tracker_.reset(NULL);
 203 }
 204
 205 void DropdownBarHost::OnVisibilityChanged() {
 206 }
 207
 208 void DropdownBarHost::GetWidgetBounds(gfx::Rect* bounds) {
 209   DCHECK(bounds);
 210   *bounds = browser_view_->bounds();
 211 }
 212
 213 void DropdownBarHost::RegisterAccelerators() {
 214   DCHECK(!esc_accel_target_registered_);
 215   ui::Accelerator escape(ui::VKEY_ESCAPE, ui::EF_NONE);
 216   focus_manager_->RegisterAccelerator(
 217       escape, ui::AcceleratorManager::kNormalPriority, this);
 218   esc_accel_target_registered_ = true;
 219 }
 220
 221 void DropdownBarHost::UnregisterAccelerators() {
 222   DCHECK(esc_accel_target_registered_);
 223   ui::Accelerator escape(ui::VKEY_ESCAPE, ui::EF_NONE);
 224   focus_manager_->UnregisterAccelerator(escape, this);
 225   esc_accel_target_registered_ = false;
 226 }