1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
**
** Use, modification and distribution is allowed without limitation,
** warranty, liability or support of any kind.
**
****************************************************************************/
#include "qtwin.h"
#include <QLibrary>
#include <QApplication>
#include <QWidget>
#include <QList>
#include <QPointer>
#ifdef Q_WS_WIN
#include <qt_windows.h>
// Blur behind data structures
#define DWM_BB_ENABLE 0x00000001 // fEnable has been specified
#define DWM_BB_BLURREGION 0x00000002 // hRgnBlur has been specified
#define DWM_BB_TRANSITIONONMAXIMIZED 0x00000004 // fTransitionOnMaximized has been specified
#define WM_DWMCOMPOSITIONCHANGED 0x031E // Composition changed window message
typedef struct _DWM_BLURBEHIND
{
DWORD dwFlags;
BOOL fEnable;
HRGN hRgnBlur;
BOOL fTransitionOnMaximized;
} DWM_BLURBEHIND, *PDWM_BLURBEHIND;
typedef struct _MARGINS
{
int cxLeftWidth;
int cxRightWidth;
int cyTopHeight;
int cyBottomHeight;
} MARGINS, *PMARGINS;
typedef HRESULT (WINAPI *PtrDwmIsCompositionEnabled)(BOOL* pfEnabled);
typedef HRESULT (WINAPI *PtrDwmExtendFrameIntoClientArea)(HWND hWnd, const MARGINS* pMarInset);
typedef HRESULT (WINAPI *PtrDwmEnableBlurBehindWindow)(HWND hWnd, const DWM_BLURBEHIND* pBlurBehind);
typedef HRESULT (WINAPI *PtrDwmGetColorizationColor)(DWORD *pcrColorization, BOOL *pfOpaqueBlend);
static PtrDwmIsCompositionEnabled pDwmIsCompositionEnabled= 0;
static PtrDwmEnableBlurBehindWindow pDwmEnableBlurBehindWindow = 0;
static PtrDwmExtendFrameIntoClientArea pDwmExtendFrameIntoClientArea = 0;
static PtrDwmGetColorizationColor pDwmGetColorizationColor = 0;
/*
* Internal helper class that notifies windows if the
* DWM compositing state changes and updates the widget
* flags correspondingly.
*/
class WindowNotifier : public QWidget
{
public:
WindowNotifier() { winId(); }
void addWidget(QWidget *widget) { widgets.append(widget); }
void removeWidget(QWidget *widget) { widgets.removeAll(widget); }
bool winEvent(MSG *message, long *result);
private:
QWidgetList widgets;
};
static bool resolveLibs()
{
if (!pDwmIsCompositionEnabled) {
QLibrary dwmLib(QString::fromAscii("dwmapi"));
pDwmIsCompositionEnabled =(PtrDwmIsCompositionEnabled)dwmLib.resolve("DwmIsCompositionEnabled");
pDwmExtendFrameIntoClientArea = (PtrDwmExtendFrameIntoClientArea)dwmLib.resolve("DwmExtendFrameIntoClientArea");
pDwmEnableBlurBehindWindow = (PtrDwmEnableBlurBehindWindow)dwmLib.resolve("DwmEnableBlurBehindWindow");
pDwmGetColorizationColor = (PtrDwmGetColorizationColor)dwmLib.resolve("DwmGetColorizationColor");
}
return pDwmIsCompositionEnabled != 0;
}
#endif
/*!
* Chekcs and returns true if Windows DWM composition
* is currently enabled on the system.
*
* To get live notification on the availability of
* this feature, you will currently have to
* reimplement winEvent() on your widget and listen
* for the WM_DWMCOMPOSITIONCHANGED event to occur.
*
*/
bool QtWin::isCompositionEnabled()
{
#ifdef Q_WS_WIN
if (resolveLibs()) {
HRESULT hr = S_OK;
BOOL isEnabled = false;
hr = pDwmIsCompositionEnabled(&isEnabled);
if (SUCCEEDED(hr))
return isEnabled;
}
#endif
return false;
}
/*!
* Enables Blur behind on a Widget.
*
* \a enable tells if the blur should be enabled or not
*/
bool QtWin::enableBlurBehindWindow(QWidget *widget, bool enable)
{
Q_ASSERT(widget);
bool result = false;
#ifdef Q_WS_WIN
if (resolveLibs()) {
DWM_BLURBEHIND bb = {0};
HRESULT hr = S_OK;
bb.fEnable = enable;
bb.dwFlags = DWM_BB_ENABLE;
bb.hRgnBlur = NULL;
widget->setAttribute(Qt::WA_TranslucentBackground, enable);
widget->setAttribute(Qt::WA_NoSystemBackground, enable);
hr = pDwmEnableBlurBehindWindow(widget->winId(), &bb);
if (SUCCEEDED(hr)) {
result = true;
windowNotifier()->addWidget(widget);
}
}
#endif
return result;
}
/*!
* ExtendFrameIntoClientArea.
*
* This controls the rendering of the frame inside the window.
* Note that passing margins of -1 (the default value) will completely
* remove the frame from the window.
*
* \note you should not call enableBlurBehindWindow before calling
* this functions
*
* \a enable tells if the blur should be enabled or not
*/
bool QtWin::extendFrameIntoClientArea(QWidget *widget, int left, int top, int right, int bottom)
{
Q_ASSERT(widget);
Q_UNUSED(left);
Q_UNUSED(top);
Q_UNUSED(right);
Q_UNUSED(bottom);
bool result = false;
#ifdef Q_WS_WIN
if (resolveLibs()) {
QLibrary dwmLib(QString::fromAscii("dwmapi"));
HRESULT hr = S_OK;
MARGINS m = {left, top, right, bottom};
hr = pDwmExtendFrameIntoClientArea(widget->winId(), &m);
if (SUCCEEDED(hr)) {
result = true;
windowNotifier()->addWidget(widget);
}
widget->setAttribute(Qt::WA_TranslucentBackground, result);
}
#endif
return result;
}
/*!
* Returns the current colorizationColor for the window.
*
* \a enable tells if the blur should be enabled or not
*/
QColor QtWin::colorizatinColor()
{
QColor resultColor = QApplication::palette().window().color();
#ifdef Q_WS_WIN
if (resolveLibs()) {
DWORD color = 0;
BOOL opaque = FALSE;
QLibrary dwmLib(QString::fromAscii("dwmapi"));
HRESULT hr = S_OK;
hr = pDwmGetColorizationColor(&color, &opaque);
if (SUCCEEDED(hr))
resultColor = QColor(color);
}
#endif
return resultColor;
}
#ifdef Q_WS_WIN
WindowNotifier *QtWin::windowNotifier()
{
static WindowNotifier *windowNotifierInstance = 0;
if (!windowNotifierInstance)
windowNotifierInstance = new WindowNotifier;
return windowNotifierInstance;
}
/* Notify all enabled windows that the DWM state changed */
bool WindowNotifier::winEvent(MSG *message, long *result)
{
if (message && message->message == WM_DWMCOMPOSITIONCHANGED) {
bool compositionEnabled = QtWin::isCompositionEnabled();
foreach(QWidget * widget, widgets) {
if (widget) {
widget->setAttribute(Qt::WA_NoSystemBackground, compositionEnabled);
}
widget->update();
}
}
return QWidget::winEvent(message, result);
}
#endif
|
