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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/widget/widget_hwnd_utils.h"
#include <dwmapi.h>
#include "base/command_line.h"
#include "base/win/windows_version.h"
#include "ui/base/l10n/l10n_util_win.h"
#include "ui/base/ui_base_switches.h"
#include "ui/views/widget/widget_delegate.h"
#include "ui/views/win/hwnd_message_handler.h"
#if defined(OS_WIN)
#include "ui/base/win/shell.h"
#endif
namespace views {
namespace {
void CalculateWindowStylesFromInitParams(
const Widget::InitParams& params,
WidgetDelegate* widget_delegate,
internal::NativeWidgetDelegate* native_widget_delegate,
DWORD* style,
DWORD* ex_style,
DWORD* class_style) {
*style = WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
*ex_style = 0;
*class_style = CS_DBLCLKS;
// Set type-independent style attributes.
if (params.child)
*style |= WS_CHILD;
if (params.show_state == ui::SHOW_STATE_MAXIMIZED)
*style |= WS_MAXIMIZE;
if (params.show_state == ui::SHOW_STATE_MINIMIZED)
*style |= WS_MINIMIZE;
if (!params.accept_events)
*ex_style |= WS_EX_TRANSPARENT;
if (!params.can_activate)
*ex_style |= WS_EX_NOACTIVATE;
if (params.keep_on_top)
*ex_style |= WS_EX_TOPMOST;
if (params.mirror_origin_in_rtl)
*ex_style |= l10n_util::GetExtendedTooltipStyles();
// Layered windows do not work with Aura. They are basically incompatible
// with Direct3D surfaces. Officially, it should be impossible to achieve
// per-pixel alpha compositing with the desktop and 3D acceleration but it
// has been discovered that since Vista There is a secret handshake between
// user32 and the DMW. If things are set up just right DMW gets out of the
// way; it does not create a backbuffer and simply blends our D3D surface
// and the desktop background. The handshake is as follows:
// 1- Use D3D9Ex to create device/swapchain, etc. You need D3DFMT_A8R8G8B8.
// 2- The window must have WS_EX_COMPOSITED in the extended style.
// 3- The window must have WS_POPUP in its style.
// 4- The windows must not have WM_SIZEBOX, WS_THICKFRAME or WS_CAPTION in its
// style.
// 5- When the window is created but before it is presented, call
// DwmExtendFrameIntoClientArea passing -1 as the margins.
if (params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW) {
#if defined(USE_AURA)
if (ui::win::IsAeroGlassEnabled())
*ex_style |= WS_EX_COMPOSITED;
#else
*ex_style |= WS_EX_LAYERED;
#endif
}
if (params.has_dropshadow) {
*class_style |= (base::win::GetVersion() < base::win::VERSION_XP) ?
0 : CS_DROPSHADOW;
}
// Set type-dependent style attributes.
switch (params.type) {
case Widget::InitParams::TYPE_PANEL:
*ex_style |= WS_EX_TOPMOST;
if (params.remove_standard_frame) {
*style |= WS_POPUP;
break;
}
// Else, no break. Fall through to TYPE_WINDOW.
case Widget::InitParams::TYPE_WINDOW: {
*style |= WS_SYSMENU | WS_CAPTION;
bool can_resize = widget_delegate->CanResize();
bool can_maximize = widget_delegate->CanMaximize();
if (can_maximize) {
*style |= WS_OVERLAPPEDWINDOW;
} else if (can_resize || params.remove_standard_frame) {
*style |= WS_OVERLAPPED | WS_THICKFRAME;
}
if (native_widget_delegate->IsDialogBox()) {
*style |= DS_MODALFRAME;
// NOTE: Turning this off means we lose the close button, which is bad.
// Turning it on though means the user can maximize or size the window
// from the system menu, which is worse. We may need to provide our own
// menu to get the close button to appear properly.
// style &= ~WS_SYSMENU;
// Set the WS_POPUP style for modal dialogs. This ensures that the owner
// window is activated on destruction. This style should not be set for
// non-modal non-top-level dialogs like constrained windows.
*style |= native_widget_delegate->IsModal() ? WS_POPUP : 0;
}
*ex_style |=
native_widget_delegate->IsDialogBox() ? WS_EX_DLGMODALFRAME : 0;
// See layered window comment above.
if (*ex_style & WS_EX_COMPOSITED)
*style &= ~(WS_THICKFRAME | WS_CAPTION);
break;
}
case Widget::InitParams::TYPE_CONTROL:
*style |= WS_VISIBLE;
break;
case Widget::InitParams::TYPE_WINDOW_FRAMELESS:
*style |= WS_POPUP;
break;
case Widget::InitParams::TYPE_BUBBLE:
*style |= WS_POPUP;
*style |= WS_CLIPCHILDREN;
break;
case Widget::InitParams::TYPE_POPUP:
*style |= WS_POPUP;
*ex_style |= WS_EX_TOOLWINDOW;
break;
case Widget::InitParams::TYPE_MENU:
*style |= WS_POPUP;
break;
default:
NOTREACHED();
}
}
} // namespace
bool DidClientAreaSizeChange(const WINDOWPOS* window_pos) {
return !(window_pos->flags & SWP_NOSIZE) ||
window_pos->flags & SWP_FRAMECHANGED;
}
void ConfigureWindowStyles(
HWNDMessageHandler* handler,
const Widget::InitParams& params,
WidgetDelegate* widget_delegate,
internal::NativeWidgetDelegate* native_widget_delegate) {
// Configure the HWNDMessageHandler with the appropriate
DWORD style = 0;
DWORD ex_style = 0;
DWORD class_style = 0;
CalculateWindowStylesFromInitParams(params, widget_delegate,
native_widget_delegate, &style, &ex_style,
&class_style);
handler->set_initial_class_style(class_style);
handler->set_window_style(handler->window_style() | style);
handler->set_window_ex_style(handler->window_ex_style() | ex_style);
}
} // namespace views
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