Question

我在QPushbuuton中设置文本时遇到问题。我在一个按钮上设置了文本，但它从未出现过。

我为QPushbutton编写了一个用于mousepress，mouserelease事件的自定义类。

我将我的QPushbutton推广到这个班级。

我的代码如下：

// Customclass.h

枚举ButtonState { 正常，鼠标移到，推 };

class CustomButtonStates : public QPushButton
{
    Q_OBJECT


public:
    explicit CustomButtonStates(QWidget *parent = 0,const QString &normal = "", const QString &active = "",QString strText = "");
    virtual ~CustomButtonStates();
    void mousePressEvent(QMouseEvent  *event);
    void mouseReleaseEvent(QMouseEvent  *event);
    void paintEvent(QPaintEvent *e);



private:

    QString m_PixmapNormal;
    QString m_PixmapActive;
    QString m_strText;
    bool m_bPressed;
    ButtonState state;

public:
    QImage *NormalImage;
    QImage *MouseOverImage;
    QImage *PushedImage;




};

// .cpp

CustomButtonStates::CustomButtonStates(QWidget *parent,const QString &normal, const QString &active,QString strText) :
    QPushButton(parent)
{

    m_PixmapNormal = normal ;
    m_PixmapActive = active ;
    m_strText = strText ;
    state = Normal;



}


void CustomButtonStates::mousePressEvent(QMouseEvent *event)
{
    QPushButton::mousePressEvent(event);
    state = Pushed;    
    this->repaint();

}

void CustomButtonStates::mouseReleaseEvent(QMouseEvent *event)
{
    QPushButton::mouseReleaseEvent(event);
    state = Normal;
    emit clicked();
    this->repaint();

}

void CustomButtonStates::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    QImage *pic = NULL;

    NormalImage = new QImage(m_PixmapNormal);
    PushedImage = new QImage(m_PixmapActive);
    switch (state)
    {
    case Normal:
        pic = NormalImage;
        break;
    case MouseOver:
        pic = MouseOverImage;
        break;
    case Pushed:
        pic = PushedImage;
        break;
    default:
        pic = NormalImage;
        break;
    }

    painter.drawImage(0, 0, *pic);
}

CustomButtonStates::~CustomButtonStates()
{
    delete NormalImage;
    delete MouseOverImage;
    delete PushedImage;
}

在我的页面中：

 CustomButtonStates *btnMain ;
btnMain = new CustomButtonStates(this,":/Sampl1.png",":/Sample2.png","Users");
    btnMain->setText("Users");
    btnMain->setGeometry(QRect(3,6,65,33));

    connect(btnMain,SIGNAL(clicked()),this,SLOT(on_btnUsers_clicked()));

Answer 1

您应该在覆盖的paintEvent方法中手动绘制文本。但更容易 - 正如OrcunC建议的那样，使用样式表。

QPushButton pb;
pb.setStyleSheet("background-image: url(:/Users/nav_on.png);");

Answer 2

如果您不需要QPushButton中除了文字和您的数据（图片/ pixmaps）之外的任何内容，我建议您可以直接更深入一点而是继承QAbstractButton。

在你的按钮中，您将添加一个文本成员（加上加法器setText(const QString&...)和text()），然后重新实现绘制事件以绘制您的图像，并在上面的文本中此背景使用drawText()的{{1}}方法之一。

QPainter将如下所示：

paintEvent

如果你需要更好的东西，如自动换行或Qt'css'样式应用于你的文字，我建议直接使用void YourButton::paintEvent(QPaintEvent* event) { QPainter painter(this); //hereadd some logic to determine witch pixmap goes background QPixmap* selectedPixmap ... painter.drawPixmap( rect(), *selectedPixmap); //here add some logic to set painter pen and brush //according to button status (enabled/checked/...) painter.drawText( rect(), Qt::AlignCenter, text()); }并转发文本访问者QLabel。在这种情况下，请不要忘记重新实施QLabel，以便在按钮矩形更改时正确设置叠加标签。

Answer 3

首先尝试在自定义paintevent中调用QPushButton :: paintevent（event），然后应用自定义QImage。

QPushbutton settext QT中的问题？

3 个答案: