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| 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/panels/display_settings_provider_win.h" | |
| 6 | |
| 7 #include <shellapi.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "ui/views/widget/monitor_win.h" | |
| 11 | |
| 12 namespace { | |
| 13 // The thickness of the area of an auto-hiding taskbar that is still visible | |
| 14 // when the taskbar becomes hidden. | |
| 15 const int kHiddenAutoHideTaskbarThickness = 2; | |
| 16 | |
| 17 // The polling interval to check auto-hiding taskbars. | |
| 18 const int kCheckTaskbarPollingIntervalMs = 500; | |
| 19 } // namespace | |
| 20 | |
| 21 DisplaySettingsProviderWin::DisplaySettingsProviderWin() | |
| 22 : monitor_(NULL) { | |
| 23 memset(taskbars_, 0, sizeof(taskbars_)); | |
| 24 } | |
| 25 | |
| 26 DisplaySettingsProviderWin::~DisplaySettingsProviderWin() { | |
| 27 } | |
| 28 | |
| 29 void DisplaySettingsProviderWin::OnDisplaySettingsChanged() { | |
| 30 DisplaySettingsProvider::OnDisplaySettingsChanged(); | |
| 31 | |
| 32 gfx::Rect primary_work_area = GetPrimaryWorkArea(); | |
| 33 RECT rect = primary_work_area.ToRECT(); | |
| 34 monitor_ = ::MonitorFromRect(&rect, MONITOR_DEFAULTTOPRIMARY); | |
| 35 DCHECK(monitor_); | |
| 36 | |
| 37 bool taskbar_exists = CheckTaskbars(false); | |
| 38 | |
| 39 // If no auto-hiding taskbar exists, we do not need to start the polling | |
| 40 // timer. If a taskbar is then set to auto-hiding, UpdateWorkArea will be | |
| 41 // called due to the work area change. | |
| 42 if (taskbar_exists) { | |
| 43 if (!polling_timer_.IsRunning()) { | |
| 44 polling_timer_.Start(FROM_HERE, | |
| 45 base::TimeDelta::FromMilliseconds(kCheckTaskbarPollingIntervalMs), | |
| 46 this, | |
| 47 &DisplaySettingsProviderWin::OnPollingTimer); | |
| 48 } | |
| 49 } else { | |
| 50 if (polling_timer_.IsRunning()) | |
| 51 polling_timer_.Stop(); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 bool DisplaySettingsProviderWin::IsAutoHidingDesktopBarEnabled( | |
| 56 DesktopBarAlignment alignment) { | |
| 57 CheckTaskbars(false); | |
| 58 return taskbars_[static_cast<int>(alignment)].window != NULL; | |
| 59 } | |
| 60 | |
| 61 int DisplaySettingsProviderWin::GetDesktopBarThickness( | |
| 62 DesktopBarAlignment alignment) const { | |
| 63 return GetDesktopBarThicknessFromBounds(alignment, GetBounds(alignment)); | |
| 64 } | |
| 65 | |
| 66 DisplaySettingsProvider::DesktopBarVisibility | |
| 67 DisplaySettingsProviderWin::GetDesktopBarVisibility( | |
| 68 DesktopBarAlignment alignment) const { | |
| 69 return GetDesktopBarVisibilityFromBounds(alignment, GetBounds(alignment)); | |
| 70 } | |
| 71 | |
| 72 gfx::Rect DisplaySettingsProviderWin::GetBounds( | |
| 73 DesktopBarAlignment alignment) const { | |
| 74 HWND taskbar_window = taskbars_[static_cast<int>(alignment)].window; | |
| 75 if (!taskbar_window) | |
| 76 return gfx::Rect(); | |
| 77 | |
| 78 RECT rect; | |
| 79 if (!::GetWindowRect(taskbar_window, &rect)) | |
| 80 return gfx::Rect(); | |
| 81 return gfx::Rect(rect); | |
| 82 } | |
| 83 | |
| 84 int DisplaySettingsProviderWin::GetDesktopBarThicknessFromBounds( | |
| 85 DesktopBarAlignment alignment, | |
| 86 const gfx::Rect& taskbar_bounds) const { | |
| 87 switch (alignment) { | |
| 88 case DESKTOP_BAR_ALIGNED_BOTTOM: | |
| 89 return taskbar_bounds.height(); | |
| 90 case DESKTOP_BAR_ALIGNED_LEFT: | |
| 91 case DESKTOP_BAR_ALIGNED_RIGHT: | |
| 92 return taskbar_bounds.width(); | |
| 93 default: | |
| 94 NOTREACHED(); | |
| 95 return 0; | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 DisplaySettingsProvider::DesktopBarVisibility | |
| 100 DisplaySettingsProviderWin::GetDesktopBarVisibilityFromBounds( | |
| 101 DesktopBarAlignment alignment, | |
| 102 const gfx::Rect& taskbar_bounds) const { | |
| 103 gfx::Rect primary_work_area = GetPrimaryWorkArea(); | |
| 104 switch (alignment) { | |
| 105 case DESKTOP_BAR_ALIGNED_BOTTOM: | |
| 106 if (taskbar_bounds.bottom() <= primary_work_area.bottom()) | |
| 107 return DESKTOP_BAR_VISIBLE; | |
| 108 else if (taskbar_bounds.y() >= | |
| 109 primary_work_area.bottom() - kHiddenAutoHideTaskbarThickness) | |
| 110 return DESKTOP_BAR_HIDDEN; | |
| 111 else | |
| 112 return DESKTOP_BAR_ANIMATING; | |
| 113 | |
| 114 case DESKTOP_BAR_ALIGNED_LEFT: | |
| 115 if (taskbar_bounds.x() >= primary_work_area.x()) | |
| 116 return DESKTOP_BAR_VISIBLE; | |
| 117 else if (taskbar_bounds.right() <= | |
| 118 primary_work_area.x() + kHiddenAutoHideTaskbarThickness) | |
| 119 return DESKTOP_BAR_HIDDEN; | |
| 120 else | |
| 121 return DESKTOP_BAR_ANIMATING; | |
| 122 | |
| 123 case DESKTOP_BAR_ALIGNED_RIGHT: | |
| 124 if (taskbar_bounds.right() <= primary_work_area.right()) | |
| 125 return DESKTOP_BAR_VISIBLE; | |
| 126 else if (taskbar_bounds.x() >= | |
| 127 primary_work_area.right() - kHiddenAutoHideTaskbarThickness) | |
| 128 return DESKTOP_BAR_HIDDEN; | |
| 129 else | |
| 130 return DESKTOP_BAR_ANIMATING; | |
| 131 | |
| 132 default: | |
| 133 NOTREACHED(); | |
| 134 return DESKTOP_BAR_VISIBLE; | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 void DisplaySettingsProviderWin::OnPollingTimer() { | |
| 139 CheckTaskbars(true); | |
| 140 } | |
| 141 | |
| 142 bool DisplaySettingsProviderWin::CheckTaskbars(bool notify_observer) { | |
| 143 bool taskbar_exists = false; | |
| 144 UINT edges[] = { ABE_BOTTOM }; | |
| 145 for (size_t i = 0; i < kMaxTaskbars; ++i) { | |
| 146 taskbars_[i].window = | |
| 147 views::GetTopmostAutoHideTaskbarForEdge(edges[i], monitor_); | |
| 148 if (taskbars_[i].window) | |
| 149 taskbar_exists = true; | |
| 150 } | |
| 151 if (!taskbar_exists) { | |
| 152 for (size_t i = 0; i < kMaxTaskbars; ++i) { | |
| 153 taskbars_[i].thickness = 0; | |
| 154 taskbars_[i].visibility = DESKTOP_BAR_HIDDEN; | |
| 155 } | |
| 156 return false; | |
| 157 } | |
| 158 | |
| 159 for (size_t i = 0; i < kMaxTaskbars; ++i) { | |
| 160 DesktopBarAlignment alignment = static_cast<DesktopBarAlignment>(i); | |
| 161 | |
| 162 gfx::Rect bounds = GetBounds(alignment); | |
| 163 | |
| 164 // Check the thickness change. | |
| 165 int thickness = GetDesktopBarThicknessFromBounds(alignment, bounds); | |
| 166 if (thickness != taskbars_[i].thickness) { | |
| 167 taskbars_[i].thickness = thickness; | |
| 168 if (notify_observer) { | |
| 169 FOR_EACH_OBSERVER( | |
| 170 DesktopBarObserver, | |
| 171 desktop_bar_observers(), | |
| 172 OnAutoHidingDesktopBarThicknessChanged(alignment, thickness)); | |
| 173 } | |
| 174 } | |
| 175 | |
| 176 // Check and notify the visibility change. | |
| 177 DesktopBarVisibility visibility = GetDesktopBarVisibilityFromBounds( | |
| 178 alignment, bounds); | |
| 179 if (visibility != taskbars_[i].visibility) { | |
| 180 taskbars_[i].visibility = visibility; | |
| 181 if (notify_observer) { | |
| 182 FOR_EACH_OBSERVER( | |
| 183 DesktopBarObserver, | |
| 184 desktop_bar_observers(), | |
| 185 OnAutoHidingDesktopBarVisibilityChanged(alignment, visibility)); | |
| 186 } | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 return true; | |
| 191 } | |
| 192 | |
| 193 // static | |
| 194 DisplaySettingsProvider* DisplaySettingsProvider::Create() { | |
| 195 return new DisplaySettingsProviderWin(); | |
| 196 } | |
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