Problem: QDialog change background when move the mouse

I implemented a QDialog with transparent background, but i move the mouse over QDialog, background becomes dark.

What's the problem?


my code:

Note: numPadDialog is derived class of QDialog.

Code:

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// Constructor, call some functions to implent QDialog
numPadDialog::numPadDialog() {
	// TODO Auto-generated constructor stub
	setWallpaper();   //This function try put a background dark semi-transparent
	setNumericPad();  // This function put the image of numpad
	configureInterfaceNumericPad();  // This function configure map of the buttons of numpad
	setInfo("Configure this parameter: ");  //This function put extra information about numPad
	showDialog();  // This function show the QDialog 
}
 
//This function try put a background dark semi-transparent
void numPadDialog::setWallpaper(){
 
	mask= new QLabel(this);
	//set image
	QString style;
	style.clear();
	QString numPadPath;
	numPadPath.clear();
	numPadPath.append(QDir::currentPath());
	numPadPath.append(WALLPAPER_DIRECTORY);
	numPadPath.append(KEYPAD_BACKGROUND);  // image semi-transparent, dark
 
	style.append("background-color: transparent;  background: transparent; background-image: url(");
	style.append(numPadPath);
	style.append("); ");
	mask->setStyleSheet(style);
	mask->setGeometry(0,0,320,240);
	mask->setFocusPolicy(Qt::NoFocus);
}
 
 
// This function put the image of numpad
void numPadDialog::setNumericPad(){
 
	numPad= new QLabel(this);
	//set image
	QString style;
	style.clear();
	QString numPadPath;
	numPadPath.clear();
	numPadPath.append(QDir::currentPath());
	numPadPath.append(WALLPAPER_DIRECTORY);
	numPadPath.append(KEYPAD_NUMPAD);
 
	style.append("background-color: transparent;  background: transparent; background-image: url(");
	style.append(numPadPath);
	style.append("); ");
	numPad->setStyleSheet(style);
	numPad->setGeometry(0,0,320,240);
	numPad->setFocusPolicy(Qt::NoFocus);
}
 
// This function show the QDialog 
void numPadDialog::showDialog(){
	this->setWindowFlags(Qt::FramelessWindowHint);
	this->setAttribute(Qt::WA_NoSystemBackground);
	//this->setAttribute(Qt::WA_TransparentForMouseEvents);
	//this->setAttribute(Qt::WA_NoBackground);
	this->setFixedSize(320,240);  // ( x , y )
	this->setFocusPolicy(Qt::NoFocus);
	exec();
}

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Don't use stylesheets. Either use QPalette or just paint the background in the paint event.

Thank's for your help wysota! but don't works

i need to charge 2 images:

first-> semi-transparent background
second-> image of keypad

I have to try with QPalette but screen is black.

the code used is:

Code:

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//set background
	QString wallPaperPath;
	wallPaperPath.clear();
	wallPaperPath.append(QDir::currentPath());
	wallPaperPath.append(WALLPAPER_DIRECTORY);
	wallPaperPath.append(KEYPAD_NUMPAD);                                        //this line charge the keypad image but first i use the background image------>    wallPaperPath.append(BACKGROUND); in other previus function
	//wallPaperPath.append(WALLPAPER);
 
	QImage image;
	image.load(wallPaperPath,0);
	QBrush brush;
	brush.setStyle(Qt::SolidPattern);
	brush.setTextureImage(image);
 
	QPalette palette;
	palette.setBrush(QPalette::Active, QPalette::Window, brush);
	palette.setBrush(QPalette::Inactive, QPalette::Window, brush);
	palette.setBrush(QPalette::Disabled, QPalette::Window, brush);
	palette.setBrush(QPalette::Normal, QPalette::Window, brush);
	palette.setBrush(QPalette::Current, QPalette::Window, brush);
 
	palette.setBrush(QPalette::Active, QPalette::Background, brush);
	palette.setBrush(QPalette::Inactive, QPalette::Background, brush);
	palette.setBrush(QPalette::Disabled, QPalette::Background, brush);
	palette.setBrush(QPalette::Normal, QPalette::Background, brush);
	palette.setBrush(QPalette::Current, QPalette::Background, brush);
 
	palette.setBrush(QPalette::Active, QPalette::Foreground, brush);
	palette.setBrush(QPalette::Inactive, QPalette::Foreground, brush);
	palette.setBrush(QPalette::Disabled, QPalette::Foreground, brush);
	palette.setBrush(QPalette::Normal, QPalette::Foreground, brush);
	palette.setBrush(QPalette::Current, QPalette::Foreground, brush);
 
	palette.setBrush(QPalette::Active, QPalette::Base, brush);
	palette.setBrush(QPalette::Inactive, QPalette::Base, brush);
	palette.setBrush(QPalette::Disabled, QPalette::Base, brush);
	palette.setBrush(QPalette::Normal, QPalette::Base, brush);
	palette.setBrush(QPalette::Current, QPalette::Base, brush);
 
	palette.setBrush(QPalette::Active, QPalette::AlternateBase, brush);
	palette.setBrush(QPalette::Inactive, QPalette::AlternateBase, brush);
	palette.setBrush(QPalette::Disabled, QPalette::AlternateBase, brush);
	palette.setBrush(QPalette::Normal, QPalette::AlternateBase, brush);
	palette.setBrush(QPalette::Current, QPalette::AlternateBase, brush);
 
	palette.setBrush(QPalette::Active, QPalette::Highlight, brush);
	palette.setBrush(QPalette::Inactive, QPalette::Highlight, brush);
	palette.setBrush(QPalette::Disabled, QPalette::Highlight, brush);
	palette.setBrush(QPalette::Normal, QPalette::Highlight, brush);
	palette.setBrush(QPalette::Current, QPalette::Highlight, brush);
 
	palette.setBrush(QPalette::Active, QPalette::Light, brush);
	palette.setBrush(QPalette::Inactive, QPalette::Light, brush);
	palette.setBrush(QPalette::Disabled, QPalette::Light, brush);
	palette.setBrush(QPalette::Normal, QPalette::Light, brush);
	palette.setBrush(QPalette::Current, QPalette::Light, brush);
 
	this->setPalette(palette);

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