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POTrouble getting a derived QWidget to paint itself
 

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    <p>I have made my own simple widget by deriving from QWidget, and am trying to get it to paint a gradient inside its paintEvent(). I set a breakpoint inside paintEvent, but it never gets called, even when I resize the window etc. The widget is a promoted QWidget from within the designer. Here is my object code - I am not actually reading the gradient colors yet, just trying to get the paintEvent() to fire first hehe. First, the header file:</p> <pre><code>#ifndef GRADIENT_H #define GRADIENT_H #include &lt;QBrush&gt; #include &lt;QPen&gt; #include &lt;QPixmap&gt; #include &lt;QWidget&gt; class Gradient : public QWidget { Q_OBJECT public: Gradient(QWidget *parent = 0); QSize minimumSizeHint() const; QSize sizeHint() const; public slots: protected: void paintEvent(QPaintEvent *event); void resizeEvent(QResizeEvent *event); private: }; #endif // GRADIENT_H </code></pre> <p>Then, the .cpp:</p> <pre><code>#include &lt;QtGui&gt; #include &lt;QPen&gt; #include "gradient.h" Gradient::Gradient(QWidget *parent) : QWidget(parent) { //setBackgroundRole(QPalette::Base); //setAutoFillBackground(true); } QSize Gradient::minimumSizeHint() const { return QSize(20, 256); } QSize Gradient::sizeHint() const { return QSize(20, 512); } void Gradient::resizeEvent(QResizeEvent * /* event */) { //update(); repaint(); } void Gradient::paintEvent(QPaintEvent * /* event */) { QPainter painter(this); painter.fillRect(rect(), Qt::black); painter.setPen(QPen(Qt::blue,1)); // painter.setBrush(?); for (int y = 0; y &lt; height(); ++y) { painter.save(); //painter.setPen(); &lt;---here I plan to set different colors from a dynamic table painter.translate(0, y); painter.drawLine(0, 0, width(), 0); painter.restore(); } painter.drawRect(QRect(0, 0, width() - 1, height() - 1)); } </code></pre>
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