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  1. Qt
  2. QTBUG-14591

QHBoxLayout miscalculates size needed for QPushButton-derived subclasses

    Details

    • Platform/s:
      macOS

      Description

      In the example below, the widgets in the QHBoxLayout are drawn overlapping one another. Note that if you change the derivation of MyButton from QPushButton to QAbstractButton, the problem goes away.

      main.cpp
      #include <QtGui>
      
      class MyButton : public QPushButton {
      public:
        explicit MyButton(Qt::GlobalColor color, QWidget *parent = NULL)
          : QPushButton(parent), color_(color) {
          setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
        }
        QSize sizeHint() const {
          return QSize(50, 25);
        }
      protected:
        void paintEvent(QPaintEvent *) {
          QPainter painter(this);
          painter.setOpacity(0.5);
          painter.fillRect(0, 0, width(), height(), color_);
        }
      private:
        Qt::GlobalColor color_;
      };
      
      int main(int argc, char **argv) {
        QApplication app(argc, argv);
        QWidget widget;
        QHBoxLayout *layout = new QHBoxLayout;
        layout->setSpacing(0);
        MyButton *w1 = new MyButton(Qt::red);
        MyButton *w2 = new MyButton(Qt::green);
        MyButton *w3 = new MyButton(Qt::blue);
        layout->addWidget(w1);
        layout->addWidget(w2);
        layout->addWidget(w3);
        widget.setLayout(layout);
        widget.show();
        return app.exec();
      }
      

      See http://stackoverflow.com/questions/3978889/why-is-qhboxlayout-causing-widgets-to-overlap for screen shot.

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            • Assignee:
              smd Jan Arve
              Reporter:
              dmateer Dave Mateer
            • Votes:
              8 Vote for this issue
              Watchers:
              18 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

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