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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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