Qt et DWM (Aero)

Version imprimable

Qt et DWM (Aero)

Je suis en train de développer une appli avec une fenêtre dont le cadre est personnalisé, comme le sont par exemple office, Opera, Chrome, avec la transparence Aero.

J'ai réussi à créer une telle fenêtre, voir la pièce jointe.

Le problème est que quand la fenêtre est maximisée : la transparence disparait, et je me retrouve avec du noir à la place. De plus, les bordures dépassent.
J'ai fait un screen mais ce n'est pas super-visible :(

Comment puis-je faire pour rétablir la transparence lorsque la fenêtre est maximisée ?

Code source :

AMainWindow.h

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#ifndef ___AMainWindow
#define ___AMainWindow
 
#include <QtGui/QWidget>
#include <QtGui/QLabel>
#include <QtGui/QPushButton>
#ifdef Q_OS_WIN
#include "AWindowsHelper.h"
#endif
 
class AMainWindow : public QWidget {
    Q_OBJECT
 
public:
    AMainWindow(QWidget* = 0);
 
private:
	QLabel* windowTitle;
	QPushButton* systemMenu;
 
#ifdef Q_OS_WIN
private:
	AWindowsHelper* wHelper;
 
protected:
	bool winEvent(MSG*, long*);
	void paintEvent(QPaintEvent*);
#endif
};
 
#endif

AWindowsHelper.h

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#ifndef ___AWindowsHelper
#define ___AWindowsHelper
 
#include <QtGui/QWidget>
#include <windows.h>
#include <windowsx.h>
 
class AWindowsHelper : public QObject {
    Q_OBJECT
 
public:
    AWindowsHelper(QObject* = 0);
 
	enum AeroState {
		AeroUnaviable,
		AeroUnaviableThemed,
		AeroClassic,
		AeroBasic,
		AeroAviable
	};
 
	bool winEvent(MSG*, long*);
	void paintEvent(QPaintEvent*);
	AeroState aeroState();
 
private:
	typedef struct {
		int cxLeftWidth;
		int cxRightWidth;
		int cyTopHeight;
		int cyBottomHeight;
	} WMargins;
 
	typedef BOOL (WINAPI *T_IsAppThemed)(void);
	typedef HRESULT (WINAPI *T_DwmIsCompositionEnabled)(BOOL* pfEnabled);
	typedef BOOL (WINAPI *T_DwmDefWindowProc)(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam, LRESULT* plResult);
	typedef HRESULT (WINAPI *T_DwmExtendFrameIntoClientArea)(HWND hwnd, WMargins* pMarInset);
 
	T_IsAppThemed F_IsAppThemed;
	T_DwmIsCompositionEnabled F_DwmIsCompositionEnabled;
	T_DwmDefWindowProc F_DwmDefWindowProc;
	T_DwmExtendFrameIntoClientArea F_DwmExtendFrameIntoClientArea;
 
	AeroState cachedState;
	QWidget* w;
	bool dirty;
};
 
#endif

AMainWindow.cc

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#include "AMainWindow.h"
#include <QtGui/QStyle>
 
AMainWindow::AMainWindow(QWidget* parent) : QWidget(parent) {
	setWindowTitle("Crash Test");
	setWindowFlags(Qt::Window);
#ifdef Q_OS_WIN
	wHelper = new AWindowsHelper(this);
#endif
 
	QLabel* windowTitle = new QLabel(this);
	windowTitle->setText(QString::fromUtf8("<b>Qt custom frame</b> - Crash test"));
 
	int frameWidth = style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
	int titleHeight = style()->pixelMetric(QStyle::PM_TitleBarHeight);
	windowTitle->setGeometry(frameWidth + 20, 0, width() - 2 * frameWidth - 20, titleHeight);
	windowTitle->setAlignment(Qt::AlignLeft | Qt::AlignVCenter);
 
	systemMenu = new QPushButton(this);
	systemMenu->setGeometry(frameWidth, frameWidth, 16, titleHeight - 2 * frameWidth);
}
 
#ifdef Q_OS_WIN
bool AMainWindow::winEvent(MSG* m, long* l) {
	return wHelper->winEvent(m, l);
}
 
void AMainWindow::paintEvent(QPaintEvent* e) {
	wHelper->paintEvent(e);
}
#endif

AWindowsHelper.cc

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#include "AWindowsHelper.h"
#include <QtCore/QLibrary>
#include <QtCore/QSysInfo>
#include <QtGui/QStyle>
#include <QtGui/QApplication>
#include <QtGui/QLabel>
#include <QtGui/QPainter>
#include "AMainWindow.h"
 
AWindowsHelper::AWindowsHelper(QObject* parent) : QObject(parent) {
	// Loads library symbols
	cachedState = AeroUnaviable;
	dirty = true;
 
	if(QSysInfo::WindowsVersion >= QSysInfo::WV_VISTA) cachedState = AeroClassic;
 
	if(QSysInfo::WindowsVersion <= QSysInfo::WV_XP) {
		// Version older than XP doesn't support anything.
		return;
	}
 
	// UxTheme : XP and later
	QLibrary uxLib(QString::fromUtf8("uxtheme"));
 
	F_IsAppThemed = (T_IsAppThemed)uxLib.resolve("IsAppThemed");
	if(F_IsAppThemed == 0) return;
	cachedState = F_IsAppThemed() == TRUE ? AeroUnaviableThemed : AeroUnaviable;
 
	if(QSysInfo::WindowsVersion == QSysInfo::WV_XP || QSysInfo::WindowsVersion == QSysInfo::WV_2003) return;
 
	// DwmApi : Vista and later
	QLibrary dwmLib(QString::fromUtf8("dwmapi"));
 
	F_DwmIsCompositionEnabled = (T_DwmIsCompositionEnabled)dwmLib.resolve("DwmIsCompositionEnabled");
	F_DwmDefWindowProc = (T_DwmDefWindowProc)dwmLib.resolve("DwmDefWindowProc");
	F_DwmExtendFrameIntoClientArea = (T_DwmExtendFrameIntoClientArea)dwmLib.resolve("DwmExtendFrameIntoClientArea");
 
	w = qobject_cast<QWidget*>(parent);
	if(w == 0) return;
 
	w->setAttribute(Qt::WA_TranslucentBackground);
	w->setAttribute(Qt::WA_NativeWindow);
}
 
bool AWindowsHelper::winEvent(MSG* msg, long* result) {
	bool fCallDwp = true;
	LRESULT lRet = 0;
	HWND hWnd = w->winId();
	UINT message = msg->message;
 
	fCallDwp = !F_DwmDefWindowProc(hWnd, message, msg->wParam, msg->lParam, &lRet);
 
	if(message != WM_ACTIVATE && message != WM_NCCALCSIZE && message != WM_NCHITTEST && message != WM_PAINT) return false;
 
	if(message == WM_ACTIVATE) {
		RECT rcClient;
		GetWindowRect(hWnd, &rcClient);
 
		SetWindowPos(hWnd, NULL, rcClient.left, rcClient.top,
			rcClient.right - rcClient.left,
			rcClient.bottom - rcClient.top,
			SWP_FRAMECHANGED
			);
 
		int frameWidth = w->style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
 
		WMargins mar;
		mar.cxLeftWidth = frameWidth;
		mar.cxRightWidth = frameWidth;
		mar.cyBottomHeight = frameWidth;
		mar.cyTopHeight = w->style()->pixelMetric(QStyle::PM_TitleBarHeight);
 
		F_DwmExtendFrameIntoClientArea(hWnd, &mar);
 
		fCallDwp = true;
		lRet = 0;
	}
 
	if(message == WM_PAINT) {
		w->update();
 
		fCallDwp = true;
		lRet = 0;
	}
 
	if((message == WM_NCCALCSIZE) && (msg->wParam == TRUE)) {
		NCCALCSIZE_PARAMS* ncsize = reinterpret_cast<NCCALCSIZE_PARAMS*>(msg->lParam);
 
		ncsize->rgrc[0].left += 0;
		ncsize->rgrc[0].top += 0;
		ncsize->rgrc[0].right -= 0;
		ncsize->rgrc[0].bottom -= 0;
 
		lRet = 0;
		fCallDwp = false;
	}
 
	if((message == WM_NCHITTEST) && (lRet == 0)) {
		LRESULT lDwmRet = lRet;
		//F_DwmDefWindowProc(hWnd, message, msg->wParam, msg->lParam, &lDwmRet);
 
		if(lDwmRet != HTCLOSE &&
			lDwmRet != HTMINBUTTON &&
			lDwmRet != HTMAXBUTTON &&
			lDwmRet != HTHELP) {
 
			POINT hitPoint = { GET_X_LPARAM(msg->lParam), GET_Y_LPARAM(msg->lParam) };
			RECT rcWindow;
			GetWindowRect(hWnd, &rcWindow);
 
			int frameWidth = w->style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
 
			short xPos = 1;
			short yPos = 2;
 
			if(hitPoint.x > rcWindow.left && hitPoint.x < (rcWindow.left + frameWidth)) {
				xPos = 0;
			}
 
			if(hitPoint.x < rcWindow.right && hitPoint.x > (rcWindow.right - frameWidth)) {
				xPos = 2;
			}
 
			if(hitPoint.y > rcWindow.top && hitPoint.y < (rcWindow.top + frameWidth)) {
				yPos = 0;
			}
 
			if(hitPoint.y > (rcWindow.top + frameWidth) && hitPoint.y < (rcWindow.top + w->style()->pixelMetric(QStyle::PM_TitleBarHeight))) {
				yPos = 1;
			}
 
			if(hitPoint.y < rcWindow.bottom && hitPoint.y > (rcWindow.bottom - frameWidth)) {
				yPos = 3;
			}
 
			if(xPos == 0 && yPos == 0) lRet = HTTOPLEFT;
			else if(xPos == 1 && yPos == 0) lRet = HTTOP;
			else if(xPos == 2 && yPos == 0) lRet = HTTOPRIGHT;
			else if(xPos == 0 && yPos == 1) lRet = HTLEFT;
			else if(xPos == 1 && yPos == 1) lRet = HTCAPTION;
			else if(xPos == 2 && yPos == 1) lRet = HTRIGHT;
			else if(xPos == 0 && yPos == 2) lRet = HTLEFT;
			else if(xPos == 1 && yPos == 2) lRet = HTCLIENT;
			else if(xPos == 2 && yPos == 2) lRet = HTRIGHT;
			else if(xPos == 0 && yPos == 3) lRet = HTBOTTOMLEFT;
			else if(xPos == 1 && yPos == 3) lRet = HTBOTTOM;
			else if(xPos == 2 && yPos == 3) lRet = HTBOTTOMRIGHT;
 
			QWidget* wAt = QApplication::widgetAt(hitPoint.x, hitPoint.y);
			if(wAt != 0 && wAt != w && qobject_cast<QLabel*>(wAt) == 0) {
				lRet = HTCLIENT;
			}
 
			fCallDwp = false;
		}
	}
 
	*result = lRet;
	return !fCallDwp;
}
 
void AWindowsHelper::paintEvent(QPaintEvent*) {
	QPainter p(w);
 
	p.setPen(Qt::NoPen);
	p.setBrush(QApplication::palette().background());
 
	int frameWidth = w->style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
 
	p.drawRect(frameWidth, w->style()->pixelMetric(QStyle::PM_TitleBarHeight), w->width() - 2 * frameWidth,
		w->height() - frameWidth - w->style()->pixelMetric(QStyle::PM_TitleBarHeight));
}

Merci d'avance :ccool:

[EDIT]
Chose étonnante, le cadre transparent maximisé fonctionne si aucun widget n'est placé sur ma fenêtre (ce qui n'est pas trop mon interêt...)

[EDIT]
Les pièces jointes (devenues inutiles) ont été supprimées.

Ça y est j'ai réussi. Je comprends toujours pas pourquoi ca marchait pas, mais maintenant ca marche.

J'ai d'ailleurs essayé de réduire un peu le code en mettant tout dans une même classe. Voici ce que ca donne :

AMainWindow.h

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#ifndef ___AMainWindow
#define ___AMainWindow
 
#include <QtGui/QWidget>
 
class AMainWindow : public QWidget {
    Q_OBJECT
 
public:
    AMainWindow(QWidget* = 0);
 
private:
    bool winEvent(MSG*, long*);
    bool isDirty;
};
 
#endif

AMainWindow.cc

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#include "AMainWindow.h"
 
#ifdef Q_OS_WIN
#include <Windows.h>
#include <WindowsX.h>
#include <QtCore/QLibrary>
#include <QtCore/QSysInfo>
#include <QtGui/QStyle>
#include <QtGui/QApplication>
 
namespace Win {
    typedef struct {
        int cxLeftWidth;
        int cxRightWidth;
        int cyTopHeight;
        int cyBottomHeight;
    }  Margins;
 
    const unsigned int WM_Activate = 0x0006;
    const unsigned int WM_NCCalcSize = 0x0083;
    const unsigned int WM_NCHitTest = 0x0084;
    const unsigned int WM_ThemeChanged = 0x031A;
    const unsigned int WM_DwmCompostitionChanged = 0x031E;
    const unsigned int WM_DwmNcMouseLeave = 674;
 
    // Defines to be nicer and respect way to write
    typedef BOOL Bool;
    typedef HWND Hwnd;
    typedef UINT UInt;
    typedef WPARAM WParam;
    typedef LPARAM LParam;
    typedef LRESULT LResult;
    typedef HRESULT HResult;
 
    // Types to load dynamicly functions
    typedef Bool (WINAPI *_DwmDefWindowProc)(Hwnd, UInt, WParam, LParam, LResult*);
    typedef HResult (WINAPI *_DwmIsCompositionEnabled)(Bool*);
    typedef HResult (WINAPI *_DwmExtendFrameIntoClientArea)(Hwnd, const Margins*);
    typedef Bool (WINAPI *_IsAppThemed)();
 
    // Placeholders for functions
    static _DwmDefWindowProc DwmDefWindowProc = 0;
    static _DwmIsCompositionEnabled DwmIsCompositionEnabled = 0;
    static _DwmExtendFrameIntoClientArea DwmExtendFrameIntoClientArea = 0;
    static _IsAppThemed IsAppThemed = 0;
}
 
#endif
 
AMainWindow::AMainWindow(QWidget* parent) : QWidget(parent) {
    setWindowFlags(Qt::Window);
    setAttribute(Qt::WA_NativeWindow);
 
    /* Builds main ui */
 
#ifdef Q_OS_WIN
    setAttribute(Qt::WA_TranslucentBackground);
 
    if(QSysInfo::WindowsVersion < QSysInfo::WV_5_0) goto skip;
    {
        QLibrary uxLib(QString::fromUtf8("uxtheme"));
        Win::IsAppThemed = (Win::_IsAppThemed)uxLib.resolve("IsAppThemed");
    }
 
    if(QSysInfo::WindowsVersion < QSysInfo::WV_6_0) goto skip;
    {
        QLibrary dwmLib(QString::fromUtf8("dwmapi"));
        Win::DwmDefWindowProc = (Win::_DwmDefWindowProc)dwmLib.resolve("DwmDefWindowProc");
        Win::DwmExtendFrameIntoClientArea = (Win::_DwmExtendFrameIntoClientArea)dwmLib.resolve("DwmExtendFrameIntoClientArea");
        Win::DwmIsCompositionEnabled = (Win::_DwmIsCompositionEnabled)dwmLib.resolve("DwmIsCompositionEnabled");
    }
 
skip:;
#endif
}
 
#ifdef Q_OS_WIN
bool AMainWindow::winEvent(MSG* msg, long* result) {
    Win::Hwnd hWnd = winId();
    Win::LParam lParam = msg->lParam;
    Win::WParam wParam = msg->wParam;
    Win::UInt message = msg->message;
    bool retVal = true;
 
    switch(msg->message) {
        case Win::WM_NCHitTest: {
            Win::LResult lResult;
            Win::DwmDefWindowProc(hWnd, message, wParam, lParam, &lResult);
            if(lResult == HTCLOSE ||
                lResult == HTMAXBUTTON ||
                lResult == HTMINBUTTON ||
                lResult == HTHELP
            ) {
                *result = lResult;
                return retVal;
            }
 
            RECT rcWindow;
            GetWindowRect(hWnd, &rcWindow);
 
            short uRow = 2;
            short uCol = 1;
 
            int frameBorder = style()->pixelMetrix(QStyle::PM_MdiSubWindowFrameWidth);
            int frameTitle = style()->pixelMetric(QStyle::PM_TitleBarHeight);
 
            POINT hitPoint = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };
 
            if(hitPoint.y > rcWindow.top && hitPoint.y < rcWindow.top + frameBorder) {
                uRow = 0;
            }
 
            if(hitPoint.y >= rcWindow.top + frameBorder && hitPoint.y < rcWindow.top + frameTitle + frameBorder) {
                uRow = 1;
            }
 
            if(hitPoint.y < rcWindow.bottom && hitPoint.y > rcWindow.bottom - frameBorder) {
                uRow = 3;
            }
 
            if(hitPoint.x > rcWindow.left && hitPoint.x < rcWindow.left + frameBorder) {
                uCol = 0;
            }
 
            if(hitPoint.x < rcWindow.right && hitPoint.x > rcWindow.right - frameBorder) {
                uCol = 2;
            }
 
            {
                short getFrameZone[4][3] = {
                    { HTTOPLEFT, HTTOP, HTTOPRIGHT },
                    { HTLEFT, HTCAPTION, HTRIGHT },
                    { HTLEFT, HTNOWHERE, HTRIGHT },
                    { HTBOTTOMLEFT, HTBOTTOM, HTBOTTOMRIGHT }
                };
 
                *result = getFrameZone[uRow][uCol];
            }
 
            if(*result == HTNOWHERE) retVal = false;
 
            QWidget* wAt = QApplication::widgetAt(hitPoint.x, hitPoint.y);
            if(wAt != 0 && wAt != this && qobject_cast<QLabel*>(wAt) == 0) {
                *result = HTCLIENT;
            }
 
            break;
        } // case Win::WM_NcHitTest
        case Win::WM_NCCalcSize: {
            NCCALCSIZE_PARAMS* ncsize = reinterpret_cast<NCCALCSIZE_PARAMS*>(lParam);
 
            DefWindowProc(hWnd, message, wParam, lParam);
 
            int frameBorder = style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
            int frameTitle = style()->pixelMetric(QStyle::PM_TitleBarHeight);
 
            ncsize->rgrc[0].top -= frameTitle;
            ncsize->rgrc[0].left -= 0;
            ncsize->rgrc[0].right += 0;
            ncsize->rgrc[0].bottom += 0;
 
            *result = 0;
 
            break;
        } // case Win::WM_NcCalSize
        case Win::WM_Activate: {
            RECT rcClient;
            GetWindowRect(hWnd, &rcClient);
 
            SetWindowPos(hWnd, 0,
                rcClient.left,
                rcClient.right,
                rcClient.right - rcClient.left,
                rcClient.bottom - rcClient.top,
                SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE
            );
 
            int frameBorder = style()->pixelMetric(QStyle::PM_MdiSubWindowFrameWidth);
            int frameTitle = style()->pixelMetric(QStyle::PM_TitleBarHeight);
 
            Win::Margins mar;
            mar.cxLeftWidth = 0;
            mar.cxRightWidth = 0;
            mar.cyBottomHeight = 0;
            mar.cyTopHeight = frameTitle + frameBorder;
 
            Win::DwmExtendFrameIntoClientArea(hWnd, &mar);
 
            break;
        } // case Win::Wm_Activate
        case WM_NCMOUSEMOVE:
        case WM_NCLBUTTONDOWN:
        case WM_NCLBUTTONUP:
        case Win::WM_DwmNcMouseLeave: {
            Win::LResult lResult;
            Win::DwmDefWindowProc(hWnd, message, wParam, lParam, &lResult);
            *result = DefWindowProc(hWnd, message, wParam, lParam);
            break;
        } // case Win::WM_DwmNcMouseLeave
        case WM_NCPAINT:
            update();
            retVal = false;
            break;
        default:
            retVal = false;
        } // Switch
 
        return retVal;
    }
#endif

28/05/2010, 09h46
yan

:merci:
pour le code
28/05/2010, 23h15
Der Drachen

Citation:

Envoyé par yan

:merci:
pour le code

Mais de rien :ccool:

Enfin, le code au dessus n'est pas totalement fonctionnel. Mais comme je suis partageur (on dit "partisan de l'open source" :aie: ), j'ai mis ca sur le projet Sourceforge que j'avais monté pour. Le code est pas encore fonctionnel à 100% (quelques petits problèmes avec QPainter, 'vais essayer de voir ça) mais c'est déjà mieux que le brouillon au dessus (support des thèmes Aero Basic et Windows Classic), pis surtout pas à avoir à réécrire tout le code ci dessus... Je donnerai des infos quand ce sera finis (si je trouve ou on fait ça), parce que là je m'éliogne (un peu) du sujet initial...

https://sourceforge.net/projects/qdwm/
27/07/2012, 15h02
_toto74

:ccool: you're my god!

Merci beaucoup et bravo!