左侧列表视图单击将使用与单击的项项对应的填充右侧表视图。问题是,每次单击左侧视图时,右侧表视图项列表都会不断增长。 我可以继续从每个左侧视图上的所有项目中清除右侧视图单击:
for i in range(self.rowCount()):
self.beginRemoveRows(QtCore.QModelIndex(), i, i)
self.endRemoveRows()
但这将需要一次又一次地重新创建右侧视图项(甚至对于那些先前创建(然后删除)的单击项也是如此。
我想知道是否有办法只创建那些从未创建过的右侧视图项。而不是在左视图单击时删除它们:隐藏它们以便稍后再次单击相应的左侧视图项时取消隐藏。
请避免使用简短的非描述性短语或关键字。相反,张贴示例代码,清楚地说明如何实现它。再一次,我们的目标是在右侧视图中显示一个列表,只列出那些使用左侧视图单击其类型的动物。
^{pr2}$模型/代理设置的工作示例:
import os,sys
from PyQt4 import QtCore, QtGui
app=QtGui.QApplication(sys.argv)
elements={'Animals':{1:'Bison',2:'Panther',3:'Elephant'},'Birds':{1:'Duck',2:'Hawk',3:'Pigeon'},'Fish':{1:'Shark',2:'Salmon',3:'Piranha'}}
class ListModel(QtCore.QAbstractTableModel):
def __init__(self):
QtCore.QAbstractTableModel.__init__(self)
self.items=[]
def rowCount(self, parent=QtCore.QModelIndex()):
return len(self.items)
def columnCount(self, index=QtCore.QModelIndex()):
return 1
def data(self, index, role):
if not index.isValid() or not (0<=index.row()<len(self.items)): return QtCore.QVariant()
key=str(self.items[index.row()])
if role==QtCore.Qt.UserRole:
return key
if role==QtCore.Qt.DisplayRole:
return key
def addItem(self, key=None):
totalItems=self.rowCount()
self.beginInsertRows(QtCore.QModelIndex(), totalItems, totalItems)
self.items.append(str(key))
self.endInsertRows()
def buildItems(self):
for key in elements:
self.addItem(key)
class TableModel(QtCore.QAbstractTableModel):
def __init__(self):
QtCore.QAbstractTableModel.__init__(self)
self.items=[]
def rowCount(self, parent=QtCore.QModelIndex()):
return len(self.items)
def columnCount(self, index=QtCore.QModelIndex()):
return 4
def data(self, index, role):
key=str(self.items[index.row()])
column=index.column()
if not index.isValid() or not (0<=index.row()<len(self.items)): return QtCore.QVariant()
if role==QtCore.Qt.DisplayRole:
if not column: return key
else: return elements.get(key,{}).get(column)
def rebuildItems(self, index):
key=index.data(QtCore.Qt.UserRole).toString()
if key in self.items: return
totalItems=self.rowCount()
self.beginInsertRows(QtCore.QModelIndex(), totalItems, totalItems)
self.items.append(key)
self.endInsertRows()
class ProxyTableModel(QtGui.QSortFilterProxyModel):
def __init__(self, parent=None):
super(ProxyTableModel, self).__init__(parent)
def headerData(self, column, orientation, role=QtCore.Qt.DisplayRole):
if role == QtCore.Qt.TextAlignmentRole:
if orientation == QtCore.Qt.Horizontal:
return QtCore.QVariant(int(QtCore.Qt.AlignLeft|QtCore.Qt.AlignVCenter))
return QtCore.QVariant(int(QtCore.Qt.AlignRight|QtCore.Qt.AlignVCenter))
if role != QtCore.Qt.DisplayRole:
return QtCore.QVariant()
if orientation==QtCore.Qt.Horizontal:
return QtCore.QVariant("Species %s"%column)
return QtCore.QVariant(int(column + 1))
class Window(QtGui.QWidget):
def __init__(self):
super(Window, self).__init__()
mainLayout=QtGui.QHBoxLayout()
self.setLayout(mainLayout)
listModel=ListModel()
listModel.buildItems()
tableModel=TableModel()
proxyTableModel=ProxyTableModel()
proxyTableModel.setSourceModel(tableModel)
proxyTableModel.setFilterKeyColumn(0)
self.viewA=QtGui.QListView()
self.viewA.setModel(listModel)
self.viewA.clicked.connect(self.onClick)
self.viewB=QtGui.QTableView()
self.viewB.setModel(proxyTableModel)
self.viewB.setColumnHidden(0,True)
mainLayout.addWidget(self.viewA)
mainLayout.addWidget(self.viewB)
self.show()
def onClick(self, index):
self.viewB.model().sourceModel().rebuildItems(index)
key=index.data().toString()
self.viewB.model().setFilterRegExp(key)
window=Window()
sys.exit(app.exec_())
下面是一个基于mdurant建议的工作代码(非常感谢!)。与使用proxy model
(过滤右侧视图的显示内容)不同,使用了一个现有索引(为了使本例中的内容更简单,我将右侧视图切换为QListView)。
import os,sys
from PyQt4 import QtCore, QtGui
app=QtGui.QApplication(sys.argv)
elements={'Animals':{0:'Bison',1:'Panther',2:'Elephant',3:'Dog'},'Birds':{0:'Duck',1:'Hawk',2:'Pigeon'},'Fish':{0:'Shark',1:'Salmon'}}
class ListModel(QtCore.QAbstractTableModel):
def __init__(self):
QtCore.QAbstractTableModel.__init__(self)
self.items=[]
def rowCount(self, parent=QtCore.QModelIndex()):
return len(self.items)
def columnCount(self, index=QtCore.QModelIndex()):
return 1
def data(self, index, role):
if not index.isValid() or not (0<=index.row()<len(self.items)): return QtCore.QVariant()
key=str(self.items[index.row()])
if role==QtCore.Qt.UserRole:
return key
if role==QtCore.Qt.DisplayRole:
return key
def addItem(self, key=None):
totalItems=self.rowCount()
self.beginInsertRows(QtCore.QModelIndex(), totalItems, totalItems)
self.items.append(str(key))
self.endInsertRows()
def buildItems(self):
for key in elements:
self.addItem(key)
class TableModel(QtCore.QAbstractTableModel):
def __init__(self):
QtCore.QAbstractTableModel.__init__(self)
self.key=None
self.items=[]
def rowCount(self, parent=QtCore.QModelIndex()):
if not self.items: return 0
else: return len(self.items)
def columnCount(self, index=QtCore.QModelIndex()):
return 2
def data(self, index, role):
if not index.isValid() or not (0<=index.row()<len(self.items)): return QtCore.QVariant()
if not self.key: return QtCore.QVariant()
row=index.row()
if role==QtCore.Qt.DisplayRole:
return elements.get(self.key,{}).get(row)
def rebuildItems(self, index):
self.key=str(index.data(QtCore.Qt.UserRole).toString())
self.items=elements[self.key].keys()
self.reset()
self.dataChanged.emit(self.index(1,1), self.index(1,4))
class Window(QtGui.QWidget):
def __init__(self):
super(Window, self).__init__()
mainLayout=QtGui.QHBoxLayout()
self.setLayout(mainLayout)
self.dataModel=ListModel()
self.dataModel.buildItems()
self.viewA=QtGui.QListView()
self.viewA.setModel(self.dataModel)
self.viewA.clicked.connect(self.onClick)
self.viewB=QtGui.QListView()
self.dataModelB=TableModel()
self.viewB.setModel(self.dataModelB)
# self.viewB.setColumnHidden(0,True)
mainLayout.addWidget(self.viewA)
mainLayout.addWidget(self.viewB)
self.show()
def onClick(self, index):
self.viewB.model().rebuildItems(index)
window=Window()
sys.exit(app.exec_())
现在是单排。当还没有选择任何内容时,这一行可能被隐藏-我只是将其显示为空。在
这符合您的要求,只要不重复插入:
但是,对于隐藏项,这是由视图(或代理模型)完成的,而不是模型本身。在
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