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       *style |= WS_SYSMENU | WS_CAPTION;
  85       bool can_resize = widget_delegate->CanResize();
  86       bool can_maximize = widget_delegate->CanMaximize();
  87       if (can_maximize) {
  88         *style |= WS_OVERLAPPEDWINDOW;
  89       } else if (can_resize || params.remove_standard_frame) {
  90         *style |= WS_OVERLAPPED | WS_THICKFRAME;
  91       }
  92       if (native_widget_delegate->IsDialogBox()) {
  93         *style |= DS_MODALFRAME;
  94         // NOTE: Turning this off means we lose the close button, which is bad.
  95         // Turning it on though means the user can maximize or size the window
  96         // from the system menu, which is worse. We may need to provide our own
  97         // menu to get the close button to appear properly.
  98         // style &= ~WS_SYSMENU;
  99
 100         // Set the WS_POPUP style for modal dialogs. This ensures that the owner
 101         // window is activated on destruction. This style should not be set for
 102         // non-modal non-top-level dialogs like constrained windows.
 103         *style |= native_widget_delegate->IsModal() ? WS_POPUP : 0;
 104       }
 105       *ex_style |=
 106           native_widget_delegate->IsDialogBox() ? WS_EX_DLGMODALFRAME : 0;
 107
 108       // See layered window comment above.
 109       if (*ex_style & WS_EX_COMPOSITED)
 110         *style &= ~(WS_THICKFRAME | WS_CAPTION);
 111       break;
 112     }
 113     case Widget::InitParams::TYPE_CONTROL:
 114       *style |= WS_VISIBLE;
 115       break;
 116     case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
 117       *style |= WS_POPUP;
 118       break;
 119     case Widget::InitParams::TYPE_BUBBLE:
 120       *style |= WS_POPUP;
 121       *style |= WS_CLIPCHILDREN;
 122       if (!params.force_show_in_taskbar)
 123         *ex_style |= WS_EX_TOOLWINDOW;
 124       break;
 125     case Widget::InitParams::TYPE_POPUP:
 126       *style |= WS_POPUP;
 127       if (!params.force_show_in_taskbar)
 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