我有一个由自定义QAbstractItemModel表示的节点层次结构。是否有可能创建一个代理模型,将层次结构展平为一个列表,以允许我在QListView中显示所有节点/项目(没有代理只显示树的第一级)?
A A
+---1 1
2 2
+--3 3
4 => 4
B B
+---5 5
6 6
+--7 7
8 8
谢谢, FIPS
答案 0 :(得分:8)
将QTreeView
强制显示为列表视图更容易:
view = QtGui.QTreeView()
view.setModel(model)
view.expandAll()
view.setIndentation(0)
view.header().hide()
如果您真的希望这样做,代理不是最琐碎的事情,因为它需要保留源模型的结构模型。对于更改其结构的源模型,代理还必须跟踪源模型的结构。
作为起点,下面是具有静态结构的模型的最小实现。我只在Python 3.3上测试过它。更改在视图之间传播 - 您可以在任一视图中编辑项目的文本,并且将修改基础树模型,并适当地通知另一个视图。
代理应该简单地传递列表模型,因为它们已经是平坦的。为了演示此透明度,右窗格是附加到中间窗格中查看的代理的代理的列表视图。在中间窗格中查看的代理将附加到在左窗格中查看的树模型。
我很乐意接受那些真正了解Python / PySide的人的编辑。我对Python的了解非常有趣。
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
from PySide import QtCore, QtGui
class FlatProxyModel(QtGui.QAbstractProxyModel):
@QtCore.Slot(QtCore.QModelIndex, QtCore.QModelIndex)
def sourceDataChanged(self, topLeft, bottomRight):
self.dataChanged.emit(self.mapFromSource(topLeft), \
self.mapFromSource(bottomRight))
def buildMap(self, model, parent = QtCore.QModelIndex(), row = 0):
if row == 0:
self.m_rowMap = {}
self.m_indexMap = {}
rows = model.rowCount(parent)
for r in range(rows):
index = model.index(r, 0, parent)
print('row', row, 'item', model.data(index))
self.m_rowMap[index] = row
self.m_indexMap[row] = index
row = row + 1
if model.hasChildren(index):
row = self.buildMap(model, index, row)
return row
def setSourceModel(self, model):
QtGui.QAbstractProxyModel.setSourceModel(self, model)
self.buildMap(model)
print(flush = True)
model.dataChanged.connect(self.sourceDataChanged)
def mapFromSource(self, index):
if index not in self.m_rowMap: return QtCore.QModelIndex()
#print('mapping to row', self.m_rowMap[index], flush = True)
return self.createIndex(self.m_rowMap[index], index.column())
def mapToSource(self, index):
if not index.isValid() or index.row() not in self.m_indexMap:
return QtCore.QModelIndex()
#print('mapping from row', index.row(), flush = True)
return self.m_indexMap[index.row()]
def columnCount(self, parent):
return QtGui.QAbstractProxyModel.sourceModel(self)\
.columnCount(self.mapToSource(parent))
def rowCount(self, parent):
#print('rows:', len(self.m_rowMap), flush=True)
return len(self.m_rowMap) if not parent.isValid() else 0
def index(self, row, column, parent):
#print('index for:', row, column, flush=True)
if parent.isValid(): return QtCore.QModelIndex()
return self.createIndex(row, column)
def parent(self, index):
return QtCore.QModelIndex()
def __init__(self, parent = None):
super(FlatProxyModel, self).__init__(parent)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
model = QtGui.QStandardItemModel()
names = ['Foo', 'Bar', 'Baz']
for first in names:
row = QtGui.QStandardItem(first)
for second in names:
row.appendRow(QtGui.QStandardItem(first+second))
model.appendRow(row)
proxy = FlatProxyModel()
proxy.setSourceModel(model)
nestedProxy = FlatProxyModel()
nestedProxy.setSourceModel(proxy)
w = QtGui.QWidget()
layout = QtGui.QHBoxLayout(w)
view = QtGui.QTreeView()
view.setModel(model)
view.expandAll()
view.header().hide()
layout.addWidget(view)
view = QtGui.QListView()
view.setModel(proxy)
layout.addWidget(view)
view = QtGui.QListView()
view.setModel(nestedProxy)
layout.addWidget(view)
w.show()
sys.exit(app.exec_())