ui/views/widget/widget_hwnd_utils.cc

   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   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
 145 bool DidClientAreaSizeChange(const WINDOWPOS* window_pos) {
 146   return !(window_pos->flags & SWP_NOSIZE) ||
 147          window_pos->flags & SWP_FRAMECHANGED;
 148 }
 149
 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