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qtwin.cpp
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qtwin.cpp
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#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