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| 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/app_list/win/app_list_win.h" | |
| 6 | |
| 7 #include "chrome/browser/ui/app_list/app_list_positioner.h" | |
| 8 #include "ui/app_list/app_list_switches.h" | |
| 9 #include "ui/app_list/views/app_list_view.h" | |
| 10 #include "ui/display/screen.h" | |
| 11 #include "ui/views/widget/widget.h" | |
| 12 | |
| 13 namespace { | |
| 14 | |
| 15 static const wchar_t kTrayClassName[] = L"Shell_TrayWnd"; | |
| 16 | |
| 17 // If the mouse cursor is less than this distance, in pixels, away from the | |
| 18 // taskbar, it is considered to be in the taskbar for the purpose of anchoring. | |
| 19 static const int kSnapDistance = 50; | |
| 20 | |
| 21 // The minimum distance, in pixels, to position the app list from the taskbar or | |
| 22 // edge of screen. | |
| 23 static const int kMinDistanceFromEdge = 3; | |
| 24 | |
| 25 // Utility methods for showing the app list. | |
| 26 // Attempts to find the bounds of the Windows taskbar. Returns true on success. | |
| 27 // |rect| is in screen coordinates. If the taskbar is in autohide mode and is | |
| 28 // not visible, |rect| will be outside the current monitor's bounds, except for | |
| 29 // one pixel of overlap where the edge of the taskbar is shown. | |
| 30 bool GetTaskbarRect(gfx::Rect* rect) { | |
| 31 HWND taskbar_hwnd = FindWindow(kTrayClassName, NULL); | |
| 32 if (!taskbar_hwnd) | |
| 33 return false; | |
| 34 | |
| 35 RECT win_rect; | |
| 36 if (!GetWindowRect(taskbar_hwnd, &win_rect)) | |
| 37 return false; | |
| 38 | |
| 39 *rect = gfx::Rect(win_rect); | |
| 40 return true; | |
| 41 } | |
| 42 | |
| 43 } // namespace | |
| 44 | |
| 45 // static | |
| 46 gfx::Point AppListWin::FindAnchorPoint(const gfx::Size& view_size, | |
| 47 const display::Display& display, | |
| 48 const gfx::Point& cursor, | |
| 49 const gfx::Rect& taskbar_rect, | |
| 50 bool center_window) { | |
| 51 AppListPositioner positioner(display, view_size, kMinDistanceFromEdge); | |
| 52 | |
| 53 // Subtract the taskbar area since the display's default work_area will not | |
| 54 // subtract it if the taskbar is set to auto-hide, and the app list should | |
| 55 // never overlap the taskbar. | |
| 56 positioner.WorkAreaSubtract(taskbar_rect); | |
| 57 | |
| 58 // Special case for app list in the center of the screen. | |
| 59 if (center_window) | |
| 60 return positioner.GetAnchorPointForScreenCenter(); | |
| 61 | |
| 62 // Find which edge of the screen the taskbar is attached to. | |
| 63 AppListPositioner::ScreenEdge edge = positioner.GetShelfEdge(taskbar_rect); | |
| 64 | |
| 65 // Snap to the taskbar edge. If the cursor is greater than kSnapDistance away, | |
| 66 // anchor to the corner. Otherwise, anchor to the cursor position. | |
| 67 gfx::Point anchor; | |
| 68 if (edge == AppListPositioner::SCREEN_EDGE_UNKNOWN) { | |
| 69 // If we can't find the taskbar, snap to the bottom left. | |
| 70 return positioner.GetAnchorPointForScreenCorner( | |
| 71 AppListPositioner::SCREEN_CORNER_BOTTOM_LEFT); | |
| 72 } | |
| 73 | |
| 74 if (positioner.GetCursorDistanceFromShelf(edge, cursor) > kSnapDistance) | |
| 75 return positioner.GetAnchorPointForShelfCorner(edge); | |
| 76 | |
| 77 return positioner.GetAnchorPointForShelfCursor(edge, cursor); | |
| 78 } | |
| 79 | |
| 80 // static | |
| 81 void AppListWin::MoveNearCursor(app_list::AppListView* view) { | |
| 82 display::Screen* screen = display::Screen::GetScreen(); | |
| 83 gfx::Point cursor = screen->GetCursorScreenPoint(); | |
| 84 display::Display display = screen->GetDisplayNearestPoint(cursor); | |
| 85 | |
| 86 view->SetBubbleArrow(views::BubbleBorder::FLOAT); | |
| 87 gfx::Rect taskbar_rect; | |
| 88 GetTaskbarRect(&taskbar_rect); | |
| 89 view->SetAnchorPoint(FindAnchorPoint(view->GetPreferredSize(), | |
| 90 display, | |
| 91 cursor, | |
| 92 taskbar_rect, | |
| 93 view->ShouldCenterWindow())); | |
| 94 } | |
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