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