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 "ui/views/widget/widget_hwnd_utils.h"
6
7 #include <dwmapi.h>
8
9 #include "base/command_line.h"
10 #include "base/win/windows_version.h"
11 #include "ui/base/l10n/l10n_util_win.h"
12 #include "ui/base/ui_base_switches.h"
13 #include "ui/views/widget/widget_delegate.h"
14 #include "ui/views/win/hwnd_message_handler.h"
15
16 #if defined(OS_WIN)
17 #include "ui/base/win/shell.h"
18 #endif
19
20 namespace views {
21
22 namespace {
23
CalculateWindowStylesFromInitParams(const Widget::InitParams & params,WidgetDelegate * widget_delegate,internal::NativeWidgetDelegate * native_widget_delegate,DWORD * style,DWORD * ex_style,DWORD * class_style)24 void CalculateWindowStylesFromInitParams(
25 const Widget::InitParams& params,
26 WidgetDelegate* widget_delegate,
27 internal::NativeWidgetDelegate* native_widget_delegate,
28 DWORD* style,
29 DWORD* ex_style,
30 DWORD* class_style) {
31 *style = WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
32 *ex_style = 0;
33 *class_style = CS_DBLCLKS;
34
35 // Set type-independent style attributes.
36 if (params.child)
37 *style |= WS_CHILD;
38 if (params.show_state == ui::SHOW_STATE_MAXIMIZED)
39 *style |= WS_MAXIMIZE;
40 if (params.show_state == ui::SHOW_STATE_MINIMIZED)
41 *style |= WS_MINIMIZE;
42 if (!params.accept_events)
43 *ex_style |= WS_EX_TRANSPARENT;
44 DCHECK_NE(Widget::InitParams::ACTIVATABLE_DEFAULT, params.activatable);
45 if (params.activatable == Widget::InitParams::ACTIVATABLE_NO)
46 *ex_style |= WS_EX_NOACTIVATE;
47 if (params.keep_on_top)
48 *ex_style |= WS_EX_TOPMOST;
49 if (params.mirror_origin_in_rtl)
50 *ex_style |= l10n_util::GetExtendedTooltipStyles();
51 // Layered windows do not work with Aura. They are basically incompatible
52 // with Direct3D surfaces. Officially, it should be impossible to achieve
53 // per-pixel alpha compositing with the desktop and 3D acceleration but it
54 // has been discovered that since Vista There is a secret handshake between
55 // user32 and the DMW. If things are set up just right DMW gets out of the
56 // way; it does not create a backbuffer and simply blends our D3D surface
57 // and the desktop background. The handshake is as follows:
58 // 1- Use D3D9Ex to create device/swapchain, etc. You need D3DFMT_A8R8G8B8.
59 // 2- The window must have WS_EX_COMPOSITED in the extended style.
60 // 3- The window must have WS_POPUP in its style.
61 // 4- The windows must not have WM_SIZEBOX, WS_THICKFRAME or WS_CAPTION in its
62 // style.
63 // 5- When the window is created but before it is presented, call
64 // DwmExtendFrameIntoClientArea passing -1 as the margins.
65 if (params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW) {
66 if (ui::win::IsAeroGlassEnabled())
67 *ex_style |= WS_EX_COMPOSITED;
68 }
69 if (params.shadow_type == Widget::InitParams::SHADOW_TYPE_DROP) {
70 *class_style |= (base::win::GetVersion() < base::win::VERSION_XP) ?
71 0 : CS_DROPSHADOW;
72 }
73
74 // Set type-dependent style attributes.
75 switch (params.type) {
76 case Widget::InitParams::TYPE_PANEL:
77 *ex_style |= WS_EX_TOPMOST;
78 if (params.remove_standard_frame) {
79 *style |= WS_POPUP;
80 break;
81 }
82 // Else, no break. Fall through to TYPE_WINDOW.
83 case Widget::InitParams::TYPE_WINDOW: {
84 // WS_OVERLAPPEDWINDOW is equivalent to:
85 // WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU |
86 // WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX
87 *style |= WS_OVERLAPPEDWINDOW;
88 if (!widget_delegate->CanMaximize())
89 *style &= ~WS_MAXIMIZEBOX;
90 if (!widget_delegate->CanMinimize())
91 *style &= ~WS_MINIMIZEBOX;
92 if (!widget_delegate->CanResize())
93 *style &= ~(WS_THICKFRAME | WS_MAXIMIZEBOX);
94 if (params.remove_standard_frame)
95 *style &= ~(WS_MINIMIZEBOX | WS_MAXIMIZEBOX);
96
97 if (native_widget_delegate->IsDialogBox()) {
98 *style |= DS_MODALFRAME;
99 // NOTE: Turning this off means we lose the close button, which is bad.
100 // Turning it on though means the user can maximize or size the window
101 // from the system menu, which is worse. We may need to provide our own
102 // menu to get the close button to appear properly.
103 // style &= ~WS_SYSMENU;
104
105 // Set the WS_POPUP style for modal dialogs. This ensures that the owner
106 // window is activated on destruction. This style should not be set for
107 // non-modal non-top-level dialogs like constrained windows.
108 *style |= native_widget_delegate->IsModal() ? WS_POPUP : 0;
109 }
110 *ex_style |=
111 native_widget_delegate->IsDialogBox() ? WS_EX_DLGMODALFRAME : 0;
112
113 // See layered window comment above.
114 if (*ex_style & WS_EX_COMPOSITED)
115 *style &= ~(WS_THICKFRAME | WS_CAPTION);
116 break;
117 }
118 case Widget::InitParams::TYPE_CONTROL:
119 *style |= WS_VISIBLE;
120 break;
121 case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
122 *style |= WS_POPUP;
123 break;
124 case Widget::InitParams::TYPE_BUBBLE:
125 *style |= WS_POPUP;
126 *style |= WS_CLIPCHILDREN;
127 if (!params.force_show_in_taskbar)
128 *ex_style |= WS_EX_TOOLWINDOW;
129 break;
130 case Widget::InitParams::TYPE_POPUP:
131 *style |= WS_POPUP;
132 if (!params.force_show_in_taskbar)
133 *ex_style |= WS_EX_TOOLWINDOW;
134 break;
135 case Widget::InitParams::TYPE_MENU:
136 *style |= WS_POPUP;
137 break;
138 default:
139 NOTREACHED();
140 }
141 }
142
143 } // namespace
144
DidClientAreaSizeChange(const WINDOWPOS * window_pos)145 bool DidClientAreaSizeChange(const WINDOWPOS* window_pos) {
146 return !(window_pos->flags & SWP_NOSIZE) ||
147 window_pos->flags & SWP_FRAMECHANGED;
148 }
149
ConfigureWindowStyles(HWNDMessageHandler * handler,const Widget::InitParams & params,WidgetDelegate * widget_delegate,internal::NativeWidgetDelegate * native_widget_delegate)150 void ConfigureWindowStyles(
151 HWNDMessageHandler* handler,
152 const Widget::InitParams& params,
153 WidgetDelegate* widget_delegate,
154 internal::NativeWidgetDelegate* native_widget_delegate) {
155 // Configure the HWNDMessageHandler with the appropriate
156 DWORD style = 0;
157 DWORD ex_style = 0;
158 DWORD class_style = 0;
159 CalculateWindowStylesFromInitParams(params, widget_delegate,
160 native_widget_delegate, &style, &ex_style,
161 &class_style);
162 handler->set_initial_class_style(class_style);
163 handler->set_window_style(handler->window_style() | style);
164 handler->set_window_ex_style(handler->window_ex_style() | ex_style);
165 }
166
167 } // namespace views
168