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[提问]【请教】MainWindow中添加自定义widget跑到外面的问题 [复制链接]

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离线duoduo3_69

只看楼主倒序阅读楼主发表于: 2013-01-25

MainWindow中添加自定义widget跑到外面了，自定义widget的构造函数已经应用了MainWindow的指针，为什么呢？
自定义的Duck类构造函数

Duck::Duck(const QString &duckImgPath,QWidget *parent) :
QWidget(parent),duckImgPath(duckImgPath)
{
label = new QLabel;
movie = new QMovie(duckImgPath);
label->setMovie (movie);
movie->start ();
label->show ();
}

MainWindow构造函数

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow),
shrinkMultiple(2),speed(10)
{
duck = new Duck(":/img/duck.gif",this);
QWidget *centerWindow = new QWidget(this);
this->setCentralWidget(centerWindow);
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(duck);
mainLayout->addWidget (new QLabel(tr("dasfdsfdsfds")));
centerWindow->setLayout(mainLayout);
catImg = new QPixmap(":/img/cat.jpg");
int width = catImg->width () / shrinkMultiple;
int height = catImg->height () / shrinkMultiple;
catImgRect = new QRect(10,10,width,height);
QRect rect = this->geometry ();
rect.setWidth (width*4);
rect.setHeight (height*4);
rect.setX (20);
rect.setY (50);
this->setGeometry (rect);
// ui->setupUi(this);
}

运行结果

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离线duoduo3_69

只看该作者 1楼发表于: 2013-01-25

奇怪的是如果重写painterEvent方法则可以

Cat::Cat(QWidget *parent) :
QWidget(parent)
{
catImg = new QPixmap(":/img/little_cat.jpg");
int width = catImg->width ();
int height = catImg->height ();
catImgRect = new QRect(10,10,width,height);
}
void Cat::paintEvent (QPaintEvent *event)
{
QPainter painter(this);
painter.drawPixmap(*catImgRect,*catImg);
// QMainWindow::paintEvent (event);
}