QtreeWidget 样式表：更改所选项目样式

Posted 2023-03-29

【中文标题】QtreeWidget 样式表：更改所选项目样式

【英文标题】：QtTreeWidget stylesheet: change selected item style

【发布时间】：2014-02-28 15:41:55

【问题描述】：

我正在尝试更改 QtTreeWidget 中当前选定项目的样式。不幸的是，样式只应用于***项目而不是***的孩子。有没有人遇到过这种情况并有解决办法？

样式表在 QtDesigner 中可以正常工作。我不知道为什么它在我的代码中不起作用。我正在努力将代码提取到一个示例中。

---

样式表：

QTreeWidget::item:selected  border-color:green; 
    border-style:outset; border-width:2px; color:black; 

QTreeWidget::branch:has-children:!has-siblings:closed,
QTreeWidget::branch:closed:has-children:has-siblings 
    border-image: none;
    image: none;
    

QTreeWidget::branch:open:has-children:!has-siblings,
QTreeWidget::branch:open:has-children:has-siblings  
    border-image: none;
    image: none;
    

---

完整示例代码

import sys
from PyQt4 import QtGui, QtCore

class ConditionTree(QtGui.QTreeWidgetItem):
    def __init__(self, parent, name):
        QtGui.QTreeWidgetItem.__init__(self, parent)
        self.tree = parent

        self.setText(0, name)

        self.button = QtGui.QPushButton(name)
        self.button.pressed.connect(self.buttonPress)

    def buttonPress(self):
        self.setExpanded(not self.isExpanded())
        self.tree.setCurrentItem(self)

class mainWindow(QtGui.QMainWindow):
    '''
    Main window class handeling all gui interactions
    '''
    def __init__(self, app):
        QtGui.QMainWindow.__init__(self)


        self.tree = QtGui.QTreeWidget(self)

        self.tree.setIndentation(0)
        self.tree.setHeaderHidden(True)

        self.tree.setStyleSheet('''
                                 QTreeWidget::item:selected  border-color:green; 
                                     border-style:outset; border-width:2px; color:black; 
                                 QTreeWidget::branch:has-children:!has-siblings:closed,
                                 QTreeWidget::branch:closed:has-children:has-siblings 
                                     border-image: none;
                                     image: none;
                                 

                                 QTreeWidget::branch:open:has-children:!has-siblings,
                                 QTreeWidget::branch:open:has-children:has-siblings  
                                     border-image: none;
                                     image: none;
                                 

                                 ''')

        self.topLevel = ConditionTree(self.tree, 'toplevel')
        self.tree.setItemWidget(self.topLevel, 0, self.topLevel.button)


        for i in range(5):
            self.addNewItem(self.topLevel, str(i))

        self.tree.resize(self.tree.sizeHint())

    def addNewItem(self, toplevel, name):
        newItem = QtGui.QTreeWidgetItem()
        newItem.setText(0, name)
        newItem.setFlags(QtCore.Qt.ItemIsEditable|QtCore.Qt.ItemIsEnabled)

        toplevel.addChild(newItem)


if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)

    gui = mainWindow(app)
    gui.show()
    app.exec_()

    app.deleteLater()
    sys.exit()

---

【参考方案1】：

子项不可选择。由于您无法选择它们，因此它们不会被设置样式。在addNewItem方法中修改这一行：

newItem.setFlags(QtCore.Qt.ItemIsEditable|QtCore.Qt.ItemIsEnabled)

到

newItem.setFlags(QtCore.Qt.ItemIsEditable|QtCore.Qt.ItemIsEnabled|QtCore.Qt.ItemIsSelectable)

【讨论】：

所以子项目是可选的，只是默认情况下不是。这解决了问题。谢谢！

@Onlyjus：不，QTreeWidgetItem 默认是可选的。但是你在上面做setFlags。这取代了default value。 您的子项不可选择。