Qt学习——不规则窗体形状

窗体可以设置为图片的形状

如下：



其实就是将窗体设置一个遮罩，此遮罩设为图片的遮罩即可

这里还涉及到一些Event的函数重载，具体看代码。

头文件：

[cpp]
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#include <QtGui/QWidget>
#include <QLabel>
#include <QPixmap>
class Widget : public QWidget
{
Q_OBJECT

public:
Widget(QWidget *parent = 0);
~Widget();
protected:
//这里的三个函数都是重载函数，可以响应响应的事件
void mousePressEvent(QMouseEvent *);
void mouseMoveEvent(QMouseEvent *);
void paintEvent(QPaintEvent *);//这个在窗口需要重绘的时候自动调用
private slots:
void showtime();
private:
QPoint dragPosition;
QLabel *l;
QPixmap pix;
};

#include <QtGui/QWidget>
#include <QLabel>
#include <QPixmap>
class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
protected:
//这里的三个函数都是重载函数，可以响应响应的事件
    void mousePressEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
    void paintEvent(QPaintEvent *);//这个在窗口需要重绘的时候自动调用
private slots:
    void showtime();
private:
    QPoint dragPosition;
    QLabel *l;
        QPixmap pix;
};

源文件：

[cpp]
view plaincopyprint?

#include "widget.h"
#include <QMouseEvent>
#include <QPainter>
#include <QBitmap>
#include <QGridLayout>
#include <QTimer>
#include <QTime>
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
setWindowFlags(Qt::FramelessWindowHint);
QPalette p=palette();
p.setColor(QPalette::WindowText,Qt::green);
setPalette(p);

l=new QLabel;
QTime time=QTime::currentTime();
QGridLayout *mainLayout=new QGridLayout(this);
mainLayout->addWidget(l,0,0,Qt::AlignHCenter);

pix.load("qq.png",0,Qt::AvoidDither|Qt::ThresholdDither|Qt::ThresholdAlphaDither);
resize(pix.size());
setMask(QBitmap(pix.mask()));

QTimer *timer=new QTimer;
connect(timer,SIGNAL(timeout()),this,SLOT(showtime()));
timer->start(10);
}

Widget::~Widget()
{

}

void Widget::showtime()
{
QTime time=QTime::currentTime();
l->setText(time.toString("A hh:mm:ss"));
}

void Widget::mousePressEvent(QMouseEvent *event)
{
if(event->button()==Qt::LeftButton)
{
dragPosition=event->globalPos()-frameGeometry().topLeft();
event->accept();
}
else if(event->button()==Qt::RightButton)
{
close();
}
}

void Widget::mouseMoveEvent(QMouseEvent *event)
{
move(event->globalPos()-dragPosition);
event->accept();
}

void Widget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
painter.drawPixmap(0,0,QPixmap("qq.png"));
}

#include "widget.h"
#include <QMouseEvent>
#include <QPainter>
#include <QBitmap>
#include <QGridLayout>
#include <QTimer>
#include <QTime>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    setWindowFlags(Qt::FramelessWindowHint);
    QPalette p=palette();
    p.setColor(QPalette::WindowText,Qt::green);
    setPalette(p);

    l=new QLabel;
    QTime time=QTime::currentTime();
    QGridLayout *mainLayout=new QGridLayout(this);
    mainLayout->addWidget(l,0,0,Qt::AlignHCenter);

    pix.load("qq.png",0,Qt::AvoidDither|Qt::ThresholdDither|Qt::ThresholdAlphaDither);
    resize(pix.size());
    setMask(QBitmap(pix.mask()));

    QTimer *timer=new QTimer;
    connect(timer,SIGNAL(timeout()),this,SLOT(showtime()));
    timer->start(10);
}

Widget::~Widget()
{

}

void Widget::showtime()
{
    QTime time=QTime::currentTime();
    l->setText(time.toString("A hh:mm:ss"));
}

void Widget::mousePressEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton)
    {
        dragPosition=event->globalPos()-frameGeometry().topLeft();
        event->accept();
    }
    else if(event->button()==Qt::RightButton)
    {
        close();
    }
}

void Widget::mouseMoveEvent(QMouseEvent *event)
{
    move(event->globalPos()-dragPosition);
    event->accept();
}

void Widget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.drawPixmap(0,0,QPixmap("qq.png"));
}

下面三个函数是响应各个事件的

前面两个为了实现可拖动，时钟程序也用了

后面那个为了显示图片



可以看到，程序被拖动到了右边。