python - 带有图标的 QSlider

Question

给定一组图像，我想移动一个QSlider，这样每一步都会在其上方显示一个小缩略图图标，代表其中一个图像。有什么提示或建议吗？

Answer 1

您必须使用 QLabel 来显示图标和 QSlider 的 valueChanged 信号才能更改图标。

import sys

from PyQt4.QtCore import pyqtSlot, Qt
from PyQt4.QtGui import QWidget, QVBoxLayout, QLabel, QSlider, QApplication, QPixmap


class Widget(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.list_icons = ["icon1.png", "icon2.png", "icon3.png", "icon4.png", "icon5.png", "icon6.png"]

        lay = QVBoxLayout(self)
        self.label = QLabel()
        self.label.setAlignment(Qt.AlignHCenter)
        slider = QSlider(Qt.Horizontal)
        lay.addWidget(self.label)
        lay.addWidget(slider)
        slider.setMaximum(len(self.list_icons)-1)
        slider.valueChanged.connect(self.on_change_value)
        self.on_change_value(0)

    @pyqtSlot(int)
    def on_change_value(self, value):
        icon = self.list_icons[value]
        self.label.setPixmap(QPixmap(icon))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

---

更新：

不需要计算位置，你应该只使用 Qt 样式表。

import sys

from PyQt4.QtCore import pyqtSlot, Qt
from PyQt4.QtGui import QWidget, QVBoxLayout, QLabel, QSlider, QApplication, QPixmap


class IconSlider(QSlider):
    def __init__(self, icons, *args, **kwargs):
        QSlider.__init__(self, *args, **kwargs)
        self.icons = icons
        self.setMaximum(len(self.icons)-1)
        self.valueChanged.connect(self.on_change_value)
        self.on_change_value(0)

    @pyqtSlot(int)
    def on_change_value(self, value):
        icon = self.icons[value]
        self.setStyleSheet('''
                QSlider::handle:horizontal{{
                    image: url({});
                    margin: -4px 0;
                }}
            '''.format(icon))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = IconSlider(["icon1.png", "icon2.png", "icon3.png", "icon4.png", "icon5.png", "icon6.png"], Qt.Horizontal)
    w.show()
    sys.exit(app.exec_())