我正在使用pyqt5 / python 3.7 / win10，并且我有一个QTreeView，它只有一个可编辑的列，可以很好地对其进行编辑。我现在需要做的就是告诉程序该字段是否已更改（或检查是否已更改），无论是按下回车键还是Enter键，或者该字段由于鼠标单击其他任何地方而失去焦点。
我提供了一个简单的程序，它可以反映我到目前为止的所有情况，并且选择了单击字段而不是双击来选择要编辑的字段。
我花了很多时间试图解决这个问题，尽管我看到了可能的答案，但我还没有找到一个可以解决的办法。我敢肯定这可能很简单，但是我在实施该解决方案方面花费了很多时间。
from sys import exit as sysExit
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class CustomItemModel(QStandardItemModel):
def headerData(self, section, orientation, role):
if role == Qt.ForegroundRole:
brush = QBrush()
brush.setColor(Qt.blue)
brush.setStyle(Qt.SolidPattern)
return brush
elif role == Qt.BackgroundRole:
brush = QBrush()
brush.setColor(Qt.yellow)
brush.setStyle(Qt.SolidPattern)
return brush
elif role == Qt.FontRole:
font = QFont()
font.setBold(True)
font.setPointSize(10)
return font
return super().headerData(section, orientation, role)
class ItemDsplyr(QTreeView):
def __init__(self, CentrPane):
QTreeView.__init__(self, CentrPane)
self.CntrPane = CentrPane
self.setEditTriggers(QTreeView().NoEditTriggers)
self.model = CustomItemModel(0, 4)
self.model.setHorizontalHeaderLabels(['', 'ItemName', 'Value', 'Units'])
self.model.setHeaderData(2, Qt.Horizontal, Qt.AlignCenter, Qt.TextAlignmentRole)
self.setModel(self.model)
self.setColumnWidth(0, 1) #Not sure what the minimum column width is but is greater than 1
self.setColumnHidden(0, True)
self.header().setSectionResizeMode(0, QHeaderView.Fixed)
self.header().setStretchLastSection(False)
self.header().setSectionResizeMode(1, QHeaderView.Stretch)
self.setColumnWidth(2, 75)
self.setColumnWidth(3, 100)
self.clicked.connect(self.__itemSingleClicked)
@property
def CntrPane(self):
return self.__parent
@CntrPane.setter
def CntrPane(self, value):
self.__parent = value
def SetContent(self, tmpItmList):
self.model.setRowCount(0)
for Item in tmpItmList:
blnkVal = QStandardItem('')
ItmNam = QStandardItem(Item['ItemName'])
ItmNam.setTextAlignment(Qt.AlignLeft)
ItmNam.isEditable = False
ItmVal = QStandardItem(Item['Value'])
ItmVal.setTextAlignment(Qt.AlignCenter)
ItmUnt = QStandardItem((Item['Units']))
ItmUnt.setTextAlignment(Qt.AlignLeft)
ItmUnt.isEditable = False
self.model.appendRow([blnkVal, ItmNam, ItmVal, ItmUnt])
def __itemSingleClicked(self, index):
Item = self.selectedIndexes()[0]
CurRow = index.row()
ItemIdx = index.sibling(CurRow, 1)
ValuIdx = index.sibling(CurRow, 2)
self.edit(ValuIdx)
ItemVal = Item.model().itemFromIndex(ItemIdx).text()
ValuVal = Item.model().itemFromIndex(ValuIdx).text()
self.CntrPane.CurItemValue(ItemVal, ValuVal)
class CenterPanel(QWidget):
def __init__(self, MainWin):
QWidget.__init__(self)
self.MainWin = MainWin
self.ListItm = ''
self.ListVal = ''
ItmList = [
{'ItemName':'Cal-Itm-1', 'Value':'54', 'Units':'Units'},
{'ItemName':'Cal-Itm-2', 'Value':'54', 'Units':'Units'},
{'ItemName':'Cal-Itm-1', 'Value':'10', 'Units':'Passes'},
{'ItemName':'Cal-Itm-2', 'Value':'2.5', 'Units':'Volts'},
{'ItemName':'Run-Itm-1', 'Value':'2', 'Units':'Units'},
{'ItemName':'Run-Itm-2', 'Value':'1', 'Units':'Units'},
{'ItemName':'Run-Itm-1', 'Value':'10', 'Units':'Units'},
{'ItemName':'Run-Itm-2', 'Value':'50', 'Units':'Units'},
{'ItemName':'Tbl-Itm-1', 'Value':'0', 'Units':'Units'},
{'ItemName':'Tbl-Itm-2', 'Value':'0', 'Units':'Units'},
{'ItemName':'Tbl-Itm-1', 'Value':'0', 'Units':'Units'},
{'ItemName':'Tbl-Itm-2', 'Value':'255', 'Units':'Units'}
]
self.CatGrpTree = QTextEdit()
self.ItemDsply = ItemDsplyr(self)
self.ItemDsply.SetContent(ItmList)
CntrPane = QSplitter(Qt.Horizontal, self)
CntrPane.addWidget(self.CatGrpTree)
CntrPane.addWidget(self.ItemDsply)
CntrPane.setSizes([50,200])
hbox = QHBoxLayout(self)
hbox.addWidget(CntrPane)
self.setLayout(hbox)
@property
def MainWin(self):
return self.__parent
@MainWin.setter
def MainWin(self, value):
self.__parent = value
def CurItemValue(self, LstItm, LstVal):
print("List Item/Value Clicked:",LstItm,"/",LstVal)
if LstItm != self.ListItm:
self.ListItm = LstItm
self.ListVal = LstVal
class Window(QMainWindow):
def __init__(self, parent=None):
super(Window, self).__init__(parent)
self.title = 'Main Window'
self.left = 100
self.ztop = 100
self.wide = 700
self.high = 600
self.InitGUI()
def InitGUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.ztop, self.wide, self.high)
self.CenterPane = CenterPanel(self)
self.setCentralWidget(self.CenterPane)
self.setStyle(QStyleFactory.create('Cleanlooks'))
if __name__ == "__main__":
MainApp = QApplication([])
# This fixes a display issue with Windows
MainApp.setStyle("fusion")
MainGUI = Window()
MainGUI.show()
sysExit(MainApp.exec_())
可以看出（运行此命令时），您会得到一个QTreeView（主要是一个List，但从我的研究来看，最好使用QTreeView）。如果单击一行，您将立即进入“值”列中的编辑模式。但是，我无法确定如何知道何时检查字段是否已更改（我正在捕获预编辑的值）。因此，仅以“丢失焦点”为准，而“数据更改”会更好。
答案 0 :(得分：2)
如果您想获得仅更改的项目文本，则必须使用dataChanged(...)信号
# ...
class ItemDsplyr(QTreeView):
def __init__(self, CentrPane):
QTreeView.__init__(self, CentrPane)
# ...
self.model.setHeaderData(2, Qt.Horizontal, Qt.AlignCenter, Qt.TextAlignmentRole)
self.model.dataChanged.connect(self.on_data_changed)
# ...
@pyqtSlot("QModelIndex", "QModelIndex", "QVector<int>")
def on_data_changed(self, top_left, bottom_right, roles):
if top_left == bottom_right and Qt.DisplayRole in roles:
print(top_left.data())
# ...