from PyQt5.QtWidgets import (QApplication, QWidget, QHBoxLayout,                                QTreeWidget, QTreeWidgetItem,                                QGroupBox)from PyQt5.QtGui import QIcon, QPixmapfrom PyQt5.QtCore import QSizeclass  Bar_Navigation(QWidget):        def  __init__(self):            super(Bar_Navigation, self).__init__()            self.setMinimumHeight(600);            self.setMinimumWidth(800);                        ##layout_main.setMargin(5)            ##layout_main.setSpace(5)            self.creat_main_layout()            self.creat_bar_navigation()            self.creat_left_box()                 def get_bar_list(self):                       bar_list_item = []            bar_list_1 = ["订货管理",                                             ["客户订货", "库存订货", "供货商订货"]                                    ]            bar_list_2 = ["入库管理",                                             ["采购入库", "订货入库", "其它入库"]                                    ]            bar_list_item.append(bar_list_1)            bar_list_item.append(bar_list_2)            return  bar_list_item                    def creat_main_layout(self):              self.layout_main = QHBoxLayout()            self.setLayout( self.layout_main)                 def creat_bar_list(self, data):                        for item in data:                item_1 =  QTreeWidgetItem( self.tree_Navigation);                            ##item_1.setText(0,item[0])                　　　　　　　　　 ## 设置节点的打开/关闭状态下的不同的图片                icon = QIcon()                ##节点打开状态                 icon.addPixmap(QPixmap("./logo2.png"), QIcon.Normal, QIcon.On)                ##节点关闭状态　　                 icon.addPixmap(QPixmap("./logo1.png"), QIcon.Normal, QIcon.Off)                item_1.setIcon(0, icon)                                for item_item in item[1]:                    item_1_1 =  QTreeWidgetItem( item_1);                                item_1_1.setText(0,item_item)                   self.tree_Navigation.addTopLevelItem(item_1);                                                         def creat_bar_navigation(self):            self.tree_Navigation = QTreeWidget()                 self.tree_Navigation.setHeaderLabel("左侧导航栏");                        self.tree_Navigation.setColumnCount(1)            self.tree_Navigation.setMaximumWidth(150);                        icon_size = QSize(100, 30)            self.tree_Navigation.setIconSize(icon_size)                        ##如果treewidget就一列，该列的宽度默认等于treewidget的宽度,两列以上的话才起作用.            ##self.tree_Navigation.setColumnWidth(0,100);            data = self.get_bar_list()            self.creat_bar_list(data)            self.layout_main.addWidget(self.tree_Navigation)            ## QModelIndex            ##self.tree_Navigation.doubleClicked.connect(self.showModelSelected)            ## QTreeWidgetItem            self.tree_Navigation.itemDoubleClicked.connect(self.showSelected)                ## QModelIndex        def showModelSelected(self, modelIndex):             print( modelIndex.row(), modelIndex.column())                     ## itemObj:QTreeWidgetItem        def showSelected(self, item, column):            ##获得父节点             parent=item.parent()                            ## 注:本例的深度只有2,因此只有index_top,index_row两个变量表示路径            ##根节点上的索引            ## 合理值:非负整数            index_top = 0            ## 子节点上的索引            ##如果为-1则标示是根节点上的项;如果不是-1则标示在子节点上            ## 合理值:非负整数            index_row = -1                        ## 如果是要判断是否为None，则：            if parent is None:                index_top= self.tree_Navigation.indexOfTopLevelItem(item)            else :                                index_top =  self.tree_Navigation.indexOfTopLevelItem(parent)                  index_row=parent.indexOfChild(item)##获得节点在父节点中的行号(从0开始)                            print(index_top,  index_row)                    def creat_left_box(self):            self.box_left = QGroupBox('left party')               self.layout_main.addWidget(self.box_left)if __name__ == "__main__":    import sys    app = QApplication(sys.argv)    window = Bar_Navigation()    window.show()    sys.exit(app.exec_())