如何让QCombobox绘画项目代表它的当前项目？ (Qt 4)

2023年9月22日 266次阅读

QCombobox设置Item delegate不绘制当前Item ..

我正在尝试创建一个显示不同线型的组合框(Solid,Dotted,Dash等).目前我正在为其内容设置项目委托
以绘制/绘制线型而不是显示名称.所有线型现在都在绘制,但只要我从中选择任何线型
组合框,组合框的当前索引只显示行名而不是​​绘制它.如何使其在当前绘制选定的线型
组合框索引？

最佳答案 委托在组合弹出窗口中绘制项目：

class LineStyleDelegate(QtGui.QItemDelegate):

    def __init__(self, object, parent = None):
        QtGui.QItemDelegate.__init__(self, parent)

    def paint(self, painter, option, index):
        data = index.model().data(index, QtCore.Qt.UserRole)
        if data.isValid() and data.toPyObject() is not None:
            data = data.toPyObject()
            painter.save()

            rect = option.rect
            rect.adjust(+5, 0, -5, 0)

            pen = QtGui.QPen()
            pen.setColor(QtCore.Qt.black)
            pen.setWidth(3)
            pen.setStyle(data)
            painter.setPen(pen)

            middle = (rect.bottom() + rect.top()) / 2

            painter.drawLine(rect.left(), middle, rect.right(), middle)
            painter.restore()

        else:
            QtGui.QItemDelegate.paint(self, painter, option, index)

        painter.drawLine(rect.left(), middle, rect.right(), middle)
        painter.restore()

    else:
        QtGui.QItemDelegate.paint(self, painter, option, index)

paintEvent在组合中绘制当前项.当然,您可以手动绘制它,但有一种简单的方法来绘制组合框控件本身(如果您想要当前的箭头按钮或smth)：

def paintEvent(self, e):
    data = self.itemData(self.currentIndex(), QtCore.Qt.UserRole)
    if data.isValid() and data.toPyObject() is not None:
        data = data.toPyObject()
        p = QtGui.QStylePainter(self)
        p.setPen(self.palette().color(QtGui.QPalette.Text))

        opt = QtGui.QStyleOptionComboBox()
        self.initStyleOption(opt)
        p.drawComplexControl(QtGui.QStyle.CC_ComboBox, opt)

        painter = QtGui.QPainter(self)
        painter.save()

        rect = p.style().subElementRect(QtGui.QStyle.SE_ComboBoxFocusRect, opt, self)
        rect.adjust(+5, 0, -5, 0)

        pen = QtGui.QPen()
        pen.setColor(QtCore.Qt.black)
        pen.setWidth(3)
        pen.setStyle(data)
        painter.setPen(pen)

        middle = (rect.bottom() + rect.top()) / 2

        painter.drawLine(rect.left(), middle, rect.right(), middle)
        painter.restore()

    else:
        QtGui.QComboBox.paintEvent(self, e)
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