Qt setMask and resizing

[jpn]

Give it a try:

// main.cpp
#include <QtGui>
 
class MaskWindow : public QWidget
{
public:
	MaskWindow()
	{
		QGridLayout* grid = new QGridLayout(this);
		grid->addWidget(new QSizeGrip(this), 0, 0, Qt::AlignTop | Qt::AlignLeft);
		grid->addWidget(new QSizeGrip(this), 0, 2, Qt::AlignTop | Qt::AlignRight);
		grid->addWidget(new QSizeGrip(this), 2, 0, Qt::AlignBottom | Qt::AlignLeft);
		grid->addWidget(new QSizeGrip(this), 2, 2, Qt::AlignBottom | Qt::AlignRight);
		grid->addWidget(new QLabel("Content", this), 1, 1, Qt::AlignCenter);
		grid->setSpacing(0);
		grid->setMargin(0);
	}
 
protected:
	void resizeEvent(QResizeEvent* event)
	{
		QWidget::resizeEvent(event);
		setMask(rect());
	} 
};
 
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MaskWindow w;
	w.show();
	return a.exec();
}

// main.cpp
#include <QtGui>

class MaskWindow : public QWidget
{
public:
	MaskWindow()
	{
		QGridLayout* grid = new QGridLayout(this);
		grid->addWidget(new QSizeGrip(this), 0, 0, Qt::AlignTop | Qt::AlignLeft);
		grid->addWidget(new QSizeGrip(this), 0, 2, Qt::AlignTop | Qt::AlignRight);
		grid->addWidget(new QSizeGrip(this), 2, 0, Qt::AlignBottom | Qt::AlignLeft);
		grid->addWidget(new QSizeGrip(this), 2, 2, Qt::AlignBottom | Qt::AlignRight);
		grid->addWidget(new QLabel("Content", this), 1, 1, Qt::AlignCenter);
		grid->setSpacing(0);
		grid->setMargin(0);
	}

protected:
	void resizeEvent(QResizeEvent* event)
	{
		QWidget::resizeEvent(event);
		setMask(rect());
	} 
};

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MaskWindow w;
	w.show();
	return a.exec();
}

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