向QTreeView/QFileSystemModel中的项添加其他信息

我希望根据存储在数据库中的许多属性以及项目是文件夹还是文件,以不同的方式呈现QTreeView中的每个项目。然而,我不理解QTreeView或QFileSystemModel如何与委托通信。无论何时必须绘制项,包括在初始化期间,我都希望为委托提供它所需的所有参数,然后使用一系列 if 委托中的语句,以设置如何绘制特定项。我只找到了 .setItemDelegate

1. 我把代码放在我无法工作的注释中。一旦我理解了委托如何从QTreeView(或调用类)接收信息,我相信我可以完成其余的工作。

2. 我无法让QTreeView的这个子类显示文件夹和文件图标。

代码:

import sys
from PySide.QtCore import *
from PySide.QtGui import *

class fileSystemDelegate(QItemDelegate):
    def __init__(self, parent=None):
        QItemDelegate.__init__(self, parent)        #shouldn't this insure the icons are drawn?

    def paint(self, painter, option, index):
        painter.save()

        # set background
        painter.setPen(QPen(Qt.NoPen))
        if option.state & QStyle.State_Selected:   #DURING DRAW LOOP: idx = self.currentIndex(); if self.fileSystemModel.isDir(idx): PAINT RED
            painter.setBrush(QBrush(Qt.red))
        else:
            painter.setBrush(QBrush(Qt.white))     #ELSE PAINT WHITE
        painter.drawRect(option.rect)

        # draw item
        painter.setPen(QPen(Qt.black))
        text = index.data(Qt.DisplayRole)
        painter.drawText(option.rect, Qt.AlignLeft, text)   #there is no painter.drawIcon?

        painter.restore()

class fileSystemBrowser(QTreeView):
    def __init__(self, parent=None):
        super().__init__(parent)

        delegate = fileSystemDelegate()
        self.setItemDelegate(delegate)                  # how to provide delegate with additional info about the item to be drawn ?

        self.fileSystemModel = QFileSystemModel()
        self.fileSystemModel.setRootPath(QDir.currentPath())
        self.setModel(self.fileSystemModel)

if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = fileSystemBrowser()
    window.show()
    sys.exit(app.exec_())

C:\Program Files\Internet Explorer\ 在Microsoft Windows计算机上。但是,它只显示目录,不向终端打印任何内容。我想知道:

1. 我怎样才能得到 如果 数据方法中的语句是否在绘制时为显示中的每个项目触发?

2. 之后

代码:

import sys
from PySide.QtCore import *
from PySide.QtGui import *

database = {'C:\Program Files\Internet Explorer\ExtExport.exe':(1,3), 'C:\Program Files\Internet Explorer\iexplore.exe':(0,0)}

class fileSystemBrowser(QTreeView):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.fileSystemModel = QFileSystemModel()
        self.fileSystemModel.setRootPath(QDir.currentPath())
        self.setModel(self.fileSystemModel)

    def data(self, index, role=Qt.DisplayRole):
        if index.isValid():
            path = self.fileSystemModel.filePath(index)
            if  self.fileSystemModel.isDir(index):
                if database.get(path) != None:
                    if database[path][0] > 0:
                        print("Acting on custom data 0.") # add another icon after the regular folder icon

                    if database[path][1] > 0:
                        print("Acting on custom data 1.") # add another (different) icon after the regular folder or previous icon

if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = fileSystemBrowser()
    window.show()
    sys.exit(app.exec_())

编辑2 :

子类化模型确实起到了作用。现在,脚本似乎正在对每个项调用我的新数据方法。不幸的是,数据方法还不起作用,因此结果是一个没有图标或文本的树视图。有时我会收到错误:“QFileSystemWatcher:未能添加路径:C:/PerfLogs”。根据网上的例子,我已经评论了我认为我的错误可能在哪里,但我还不能让它起作用。我做错了什么?

import sys
from PySide.QtCore import *
from PySide.QtGui import *

database = {'C:\Program Files\Internet Explorer\ExtExport.exe':(1,3), 'C:\Program Files\Internet Explorer\iexplore.exe':(0,0)}

class newFileModel(QFileSystemModel):

    def __init__(self, parent=None):
        QFileSystemModel.__init__(self, parent)
        #self.elements = [[Do I need this? What should go here?]]

    def data(self, index, role=Qt.DisplayRole):
        if index.isValid():
            path = self.filePath(index)
            if  self.isDir(index):
                if database.get(path) != None:
                    if database[path][0] > 0:
                        print("Acting on custom data 0.") # I can add code here for different color text, etc.

                    if database[path][1] > 0:
                        print("Acting on custom data 1.") # I'll add code later
        #return self.data(index, role) # Do I need this about here?


class fileSystemBrowser(QTreeView):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.fileSystemModel = newFileModel()
        self.fileSystemModel.setRootPath(QDir.currentPath())
        self.setModel(self.fileSystemModel)


if __name__ == '__main__':

    app = QApplication(sys.argv)
    window = fileSystemBrowser()
    window.show()
    sys.exit(app.exec_())