ash/system/status_area_widget_delegate.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 "ash/system/status_area_widget_delegate.h"
   6
   7 #include "ash/ash_export.h"
   8 #include "ash/focus_cycler.h"
   9 #include "ash/shell.h"
  10 #include "ash/shell_window_ids.h"
  11 #include "base/utf_string_conversions.h"
  12 #include "ui/aura/root_window.h"
  13 #include "ui/base/resource/resource_bundle.h"
  14 #include "ui/gfx/canvas.h"
  15 #include "ui/gfx/image/image.h"
  16 #include "ui/views/accessible_pane_view.h"
  17 #include "ui/views/layout/grid_layout.h"
  18 #include "ui/views/widget/widget.h"
  19
  20 namespace {
  21
  22 int kTraySpacing = 8;
  23
  24 }  // namespace
  25
  26 namespace ash {
  27 namespace internal {
  28
  29 StatusAreaWidgetDelegate::StatusAreaWidgetDelegate()
  30     : focus_cycler_for_testing_(NULL),
  31       alignment_(SHELF_ALIGNMENT_BOTTOM) {
  32 }
  33
  34 StatusAreaWidgetDelegate::~StatusAreaWidgetDelegate() {
  35 }
  36
  37 void StatusAreaWidgetDelegate::SetFocusCyclerForTesting(
  38     const FocusCycler* focus_cycler) {
  39   focus_cycler_for_testing_ = focus_cycler;
  40 }
  41
  42 views::View* StatusAreaWidgetDelegate::GetDefaultFocusableChild() {
  43   return child_at(0);
  44 }
  45
  46 bool StatusAreaWidgetDelegate::AcceleratorPressed(
  47     const ui::Accelerator& accelerator) {
  48   if (accelerator.key_code() == ui::VKEY_ESCAPE) {
  49     RemovePaneFocus();
  50     GetFocusManager()->ClearFocus();
  51     return true;
  52   }
  53   return false;
  54 }
  55
  56 views::Widget* StatusAreaWidgetDelegate::GetWidget() {
  57   return View::GetWidget();
  58 }
  59
  60 const views::Widget* StatusAreaWidgetDelegate::GetWidget() const {
  61   return View::GetWidget();
  62 }
  63
  64 void StatusAreaWidgetDelegate::OnGestureEvent(ui::GestureEvent* event) {
  65   if (gesture_handler_.ProcessGestureEvent(*event))
  66     event->StopPropagation();
  67   else
  68     views::AccessiblePaneView::OnGestureEvent(event);
  69 }
  70
  71 bool StatusAreaWidgetDelegate::CanActivate() const {
  72   // We don't want mouse clicks to activate us, but we need to allow
  73   // activation when the user is using the keyboard (FocusCycler).
  74   const FocusCycler* focus_cycler = focus_cycler_for_testing_ ?
  75       focus_cycler_for_testing_ : Shell::GetInstance()->focus_cycler();
  76   return focus_cycler->widget_activating() == GetWidget();
  77 }
  78
  79 void StatusAreaWidgetDelegate::DeleteDelegate() {
  80 }
  81
  82 void StatusAreaWidgetDelegate::AddTray(views::View* tray) {
  83   SetLayoutManager(NULL);  // Reset layout manager before adding a child.
  84   AddChildView(tray);
  85   // Set the layout manager with the new list of children.
  86   UpdateLayout();
  87 }
  88
  89 void StatusAreaWidgetDelegate::UpdateLayout() {
  90   // Use a grid layout so that the trays can be centered in each cell, and
  91   // so that the widget gets laid out correctly when tray sizes change.
  92   views::GridLayout* layout = new views::GridLayout(this);
  93   SetLayoutManager(layout);
  94
  95   views::ColumnSet* columns = layout->AddColumnSet(0);
  96   if (alignment_ == SHELF_ALIGNMENT_BOTTOM) {
  97     for (int c = 0; c < child_count(); ++c) {
  98       if (c != 0)
  99         columns->AddPaddingColumn(0, kTraySpacing);
 100       columns->AddColumn(views::GridLayout::CENTER, views::GridLayout::CENTER,
 101                          0, /* resize percent */
 102                          views::GridLayout::USE_PREF, 0, 0);
 103     }
 104     layout->StartRow(0, 0);
 105     for (int c = child_count() - 1; c >= 0; --c)
 106       layout->AddView(child_at(c));
 107   } else {
 108     columns->AddColumn(views::GridLayout::CENTER, views::GridLayout::CENTER,
 109                        0, /* resize percent */
 110                        views::GridLayout::USE_PREF, 0, 0);
 111     for (int c = child_count() - 1; c >= 0; --c) {
 112       if (c != child_count() - 1)
 113         layout->AddPaddingRow(0, kTraySpacing);
 114       layout->StartRow(0, 0);
 115       layout->AddView(child_at(c));
 116     }
 117   }
 118   Layout();
 119   UpdateWidgetSize();
 120 }
 121
 122 void StatusAreaWidgetDelegate::ChildPreferredSizeChanged(View* child) {
 123   // Need to resize the window when trays or items are added/removed.
 124   UpdateWidgetSize();
 125 }
 126
 127 void StatusAreaWidgetDelegate::UpdateWidgetSize() {
 128   if (GetWidget())
 129     GetWidget()->SetSize(GetPreferredSize());
 130 }
 131
 132 }  // namespace internal
 133 }  // namespace ash