带图标的 QSlider

Question

给定一组图像，我想移动 QSlider 以便每一步都在其正上方显示一个代表其中一张图像的小缩略图图标。有什么提示或建议吗？

Answer 1

你必须使用QLabel来显示图标和QSlider的valueChanged信号来改变图标。

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 Style Sheet。

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_())

带图标的 QSlider

QSlider with icons

python

python-2.7

pyqt

pyqt4

qslider