用Qt显示半透明/不规则形状的窗口 [英] Displaying translucent / irregular-shaped windows with Qt
问题描述
是否可以使用Qt显示半透明和/或不规则形状的窗口?
Is it possible to display translucent and/or irregular-shaped windows with Qt?
(我假设它最终取决于底层GUI系统的功能,但我们至少要假设Windows XP / Mac OS X)
(I'm assuming it ultimately depends on the capabilities of the underlying GUI system, but let's assume at least Windows XP / Mac OS X)
如果是这样,一个人怎么做到的?
If so, how does one accomplish this?
推荐答案
是的,有可能。关键是 QWidget
Yes, it is possible. The key is the Qt::WA_TranslucentBackground
attribute of QWidget
这是一个简单的类,它绘制一个圆形的半透明窗口,其红色背景的alpha值为50%。
Here is a simple class that draws a round translucent window with a red background 50% alpha.
#include <QWidget>
class TranslucentRoundWindow : public QWidget
{
public:
TranslucentRoundWindow(QWidget *parent = 0);
virtual QSize sizeHint() const;
protected:
virtual void paintEvent(QPaintEvent *paintEvent);
};
TranslucentRoundWindow.cpp:
TranslucentRoundWindow.cpp:
#include <QtGui>
#include "TranslucentRoundWindow.h"
TranslucentRoundWindow::TranslucentRoundWindow(QWidget *parent) : QWidget(parent, Qt::FramelessWindowHint)
{
setAttribute(Qt::WA_TranslucentBackground);
}
QSize TranslucentRoundWindow::sizeHint() const
{
return QSize(300, 300);
}
void TranslucentRoundWindow::paintEvent(QPaintEvent *)
{
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
painter.setPen(Qt::NoPen);
painter.setBrush(QColor(255, 0, 0, 127));
painter.drawEllipse(0, 0, width(), height());
}
如果您希望能够使用鼠标移动此窗口,则将必须重写 mousePressEvent
, mouseMoveEvent
和 mouseReleaseEvent
。
If you want to be able to move this window with the mouse, you will have to override mousePressEvent
, mouseMoveEvent
and mouseReleaseEvent
.
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