python - 如何提取每个项目的名称和背景颜色

Question

我正在尝试提取 pyqt5 列表框中每个项目的名称和背景颜色。我的想法是循环索引行以一次选择一行并以 RGB 形式提取名称和背景颜色。我似乎不知道如何实现这一点。以下是我到目前为止的错误代码:提前致谢。

from PyQt5 import QtGui, QtWidgets
from PyQt5.QtWidgets import QAbstractItemView, QListWidgetItem, 
import sys

lst_labels = QtWidgets.QListWidget()
lst_labels.setObjectName("lst_labels")
lst_labels.setSelectionMode(QAbstractItemView.SingleSelection)
item=QListWidgetItem('first')
item.setBackground(QtGui.QColor.fromRgb(255,0,0))            
lst_labels.addItem(item)
item=QListWidgetItem('second')
item.setBackground(QtGui.QColor.fromRgb(0,255,0))            
lst_labels.addItem(item)
item=QListWidgetItem('third')
item.setBackground(QtGui.QColor.fromRgb(0,0,255))            
lst_labels.addItem(item)


for i in range (0,lst_labels.count()):
    lst_labels.SelectRows(i)
    item=lst_labels.selectedItems()

    name=item.text()
    r=item.background().red()
    g=item.background().green()
    b=item.background().blue()

if __name__ == '__main__':

    lst_labels.show()
    sys.exit(app.exec_())

Answer 1

如果您想获取每个项目的信息，则不必选择它，您只需使用 item() 方法迭代项目即可:

import sys
from PyQt5 import QtGui, QtWidgets


if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)

    lst_labels = QtWidgets.QListWidget()
    lst_labels.setObjectName("lst_labels")
    item = QtWidgets.QListWidgetItem("first")
    item.setBackground(QtGui.QColor.fromRgb(255, 0, 0))
    lst_labels.addItem(item)
    item = QtWidgets.QListWidgetItem("second")
    item.setBackground(QtGui.QColor.fromRgb(0, 255, 0))
    lst_labels.addItem(item)
    item = QtWidgets.QListWidgetItem("third")
    item.setBackground(QtGui.QColor.fromRgb(0, 0, 255))
    lst_labels.addItem(item)

    for i in range(lst_labels.count()):
        it = lst_labels.item(i)
        name = it.text()
        brush = it.background()
        color = brush.color()
        print(name)
        print(color.red(), color.green(), color.blue())

    lst_labels.show()
    sys.exit(app.exec_())

如果您想获取用户选择的项目，请使用 itemSelectionChanged 信号和 selectedItems() 方法:

import sys
from PyQt5 import QtGui, QtWidgets


if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)

    lst_labels = QtWidgets.QListWidget()
    lst_labels.setObjectName("lst_labels")
    lst_labels.setSelectionMode(QtWidgets.QAbstractItemView.SingleSelection)
    item = QtWidgets.QListWidgetItem("first")
    item.setBackground(QtGui.QColor.fromRgb(255, 0, 0))
    lst_labels.addItem(item)
    item = QtWidgets.QListWidgetItem("second")
    item.setBackground(QtGui.QColor.fromRgb(0, 255, 0))
    lst_labels.addItem(item)
    item = QtWidgets.QListWidgetItem("third")
    item.setBackground(QtGui.QColor.fromRgb(0, 0, 255))
    lst_labels.addItem(item)

    def on_itemSelectionChanged():
        for it in lst_labels.selectedItems():
            name = it.text()
            brush = it.background()
            color = brush.color()
            print(name)
            print(color.red(), color.green(), color.blue())

    lst_labels.itemSelectionChanged.connect(on_itemSelectionChanged)

    lst_labels.show()
    sys.exit(app.exec_())