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 "ash/system/status_area_widget_delegate.h"
6
7 #include "ash/ash_export.h"
8 #include "ash/ash_switches.h"
9 #include "ash/focus_cycler.h"
10 #include "ash/shell.h"
11 #include "ash/shell_window_ids.h"
12 #include "ash/system/tray/tray_constants.h"
13 #include "base/memory/scoped_ptr.h"
14 #include "base/strings/utf_string_conversions.h"
15 #include "ui/aura/window_event_dispatcher.h"
16 #include "ui/compositor/layer.h"
17 #include "ui/compositor/scoped_layer_animation_settings.h"
18 #include "ui/gfx/animation/tween.h"
19 #include "ui/gfx/canvas.h"
20 #include "ui/gfx/image/image.h"
21 #include "ui/views/accessible_pane_view.h"
22 #include "ui/views/layout/grid_layout.h"
23 #include "ui/views/widget/widget.h"
24
25 namespace {
26
27 const int kAnimationDurationMs = 250;
28
29 class StatusAreaWidgetDelegateAnimationSettings
30 : public ui::ScopedLayerAnimationSettings {
31 public:
StatusAreaWidgetDelegateAnimationSettings(ui::Layer * layer)32 explicit StatusAreaWidgetDelegateAnimationSettings(ui::Layer* layer)
33 : ui::ScopedLayerAnimationSettings(layer->GetAnimator()) {
34 SetTransitionDuration(
35 base::TimeDelta::FromMilliseconds(kAnimationDurationMs));
36 SetPreemptionStrategy(
37 ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
38 SetTweenType(gfx::Tween::EASE_IN_OUT);
39 }
40
~StatusAreaWidgetDelegateAnimationSettings()41 virtual ~StatusAreaWidgetDelegateAnimationSettings() {}
42
43 private:
44 DISALLOW_COPY_AND_ASSIGN(StatusAreaWidgetDelegateAnimationSettings);
45 };
46
47 } // namespace
48
49 namespace ash {
50
StatusAreaWidgetDelegate()51 StatusAreaWidgetDelegate::StatusAreaWidgetDelegate()
52 : focus_cycler_for_testing_(NULL),
53 alignment_(SHELF_ALIGNMENT_BOTTOM) {
54 // Allow the launcher to surrender the focus to another window upon
55 // navigation completion by the user.
56 set_allow_deactivate_on_esc(true);
57 SetPaintToLayer(true);
58 SetFillsBoundsOpaquely(false);
59 }
60
~StatusAreaWidgetDelegate()61 StatusAreaWidgetDelegate::~StatusAreaWidgetDelegate() {
62 }
63
SetFocusCyclerForTesting(const FocusCycler * focus_cycler)64 void StatusAreaWidgetDelegate::SetFocusCyclerForTesting(
65 const FocusCycler* focus_cycler) {
66 focus_cycler_for_testing_ = focus_cycler;
67 }
68
GetDefaultFocusableChild()69 views::View* StatusAreaWidgetDelegate::GetDefaultFocusableChild() {
70 return child_at(0);
71 }
72
GetWidget()73 views::Widget* StatusAreaWidgetDelegate::GetWidget() {
74 return View::GetWidget();
75 }
76
GetWidget() const77 const views::Widget* StatusAreaWidgetDelegate::GetWidget() const {
78 return View::GetWidget();
79 }
80
OnGestureEvent(ui::GestureEvent * event)81 void StatusAreaWidgetDelegate::OnGestureEvent(ui::GestureEvent* event) {
82 if (gesture_handler_.ProcessGestureEvent(*event))
83 event->StopPropagation();
84 else
85 views::AccessiblePaneView::OnGestureEvent(event);
86 }
87
CanActivate() const88 bool StatusAreaWidgetDelegate::CanActivate() const {
89 // We don't want mouse clicks to activate us, but we need to allow
90 // activation when the user is using the keyboard (FocusCycler).
91 const FocusCycler* focus_cycler = focus_cycler_for_testing_ ?
92 focus_cycler_for_testing_ : Shell::GetInstance()->focus_cycler();
93 return focus_cycler->widget_activating() == GetWidget();
94 }
95
DeleteDelegate()96 void StatusAreaWidgetDelegate::DeleteDelegate() {
97 }
98
AddTray(views::View * tray)99 void StatusAreaWidgetDelegate::AddTray(views::View* tray) {
100 SetLayoutManager(NULL); // Reset layout manager before adding a child.
101 AddChildView(tray);
102 // Set the layout manager with the new list of children.
103 UpdateLayout();
104 }
105
UpdateLayout()106 void StatusAreaWidgetDelegate::UpdateLayout() {
107 // Use a grid layout so that the trays can be centered in each cell, and
108 // so that the widget gets laid out correctly when tray sizes change.
109 views::GridLayout* layout = new views::GridLayout(this);
110 SetLayoutManager(layout);
111
112 views::ColumnSet* columns = layout->AddColumnSet(0);
113 if (alignment_ == SHELF_ALIGNMENT_BOTTOM ||
114 alignment_ == SHELF_ALIGNMENT_TOP) {
115 bool is_first_visible_child = true;
116 for (int c = 0; c < child_count(); ++c) {
117 views::View* child = child_at(c);
118 if (!child->visible())
119 continue;
120 if (!is_first_visible_child)
121 columns->AddPaddingColumn(0, kTraySpacing);
122 is_first_visible_child = false;
123 columns->AddColumn(views::GridLayout::CENTER, views::GridLayout::FILL,
124 0, /* resize percent */
125 views::GridLayout::USE_PREF, 0, 0);
126 }
127 layout->StartRow(0, 0);
128 for (int c = child_count() - 1; c >= 0; --c) {
129 views::View* child = child_at(c);
130 if (child->visible())
131 layout->AddView(child);
132 }
133 } else {
134 columns->AddColumn(views::GridLayout::FILL, views::GridLayout::CENTER,
135 0, /* resize percent */
136 views::GridLayout::USE_PREF, 0, 0);
137 bool is_first_visible_child = true;
138 for (int c = child_count() - 1; c >= 0; --c) {
139 views::View* child = child_at(c);
140 if (!child->visible())
141 continue;
142 if (!is_first_visible_child)
143 layout->AddPaddingRow(0, kTraySpacing);
144 is_first_visible_child = false;
145 layout->StartRow(0, 0);
146 layout->AddView(child);
147 }
148 }
149
150 layer()->GetAnimator()->StopAnimating();
151 StatusAreaWidgetDelegateAnimationSettings settings(layer());
152
153 Layout();
154 UpdateWidgetSize();
155 }
156
ChildPreferredSizeChanged(View * child)157 void StatusAreaWidgetDelegate::ChildPreferredSizeChanged(View* child) {
158 // Need to resize the window when trays or items are added/removed.
159 StatusAreaWidgetDelegateAnimationSettings settings(layer());
160 UpdateWidgetSize();
161 }
162
ChildVisibilityChanged(View * child)163 void StatusAreaWidgetDelegate::ChildVisibilityChanged(View* child) {
164 UpdateLayout();
165 }
166
UpdateWidgetSize()167 void StatusAreaWidgetDelegate::UpdateWidgetSize() {
168 if (GetWidget())
169 GetWidget()->SetSize(GetPreferredSize());
170 }
171
172 } // namespace ash
173