import sys,os.path
from PyQt4 import QtGui, QtCore
class TreeExperiment(QtGui.QWidget):
def __init__(self,parent=None):
QtGui.QWidget.__init__(self,parent)
self.tree=QtGui.QTreeWidget(self) #
self.tree.setObjectName("treeWidget") #
self.add_button=QtGui.QPushButton("Add", self) # Initialize a simple
self.save_button=QtGui.QPushButton("Save", self) # form containing a
gridlayout = QtGui.QGridLayout(self) # treeWidget, an
gridlayout.addWidget(self.tree,1,0,1,9) # 'Add' button, and a
gridlayout.addWidget(self.add_button,2,0,2,3) # 'Save' button
gridlayout.addWidget(self.save_button,2,3,2,3) #
self.tree.headerItem().setText(0,"Label") #
if os.path.isfile('native_tree_save.qfile'):
# First look for a previously saved tree. If found, define
# it as a QFile named 'file', open it, and define a datastream
# to read from it.
#
# Each tree node is saved to and read from the file in pairs:
# first, the QTreeWidgetItem itself, then the number of children
# the item has so that the tree structure can be re-created
#
# The first item is added directly as the root for simplicity,
# and is sent to the function which begins the tree reconstruction
file = QtCore.QFile('native_tree_save.qfile')
file.open(QtCore.QIODevice.ReadOnly)
datastream = QtCore.QDataStream(file)
child=QtGui.QTreeWidgetItem(self.tree.invisibleRootItem())
child.read(datastream)
num_childs=datastream.readUInt32()
self.restore_item(datastream,child,num_childs)
else: # Otherwise if this is the first use, create a root item
new_item=QtGui.QTreeWidgetItem(self.tree)
self.tree.setCurrentItem(self.tree.topLevelItem(0))
self.tree.currentItem().setText(0,'root')
self.tree.setItemSelected(self.tree.topLevelItem(0),1)
self.tree.setCurrentItem(self.tree.topLevelItem(0))
self.connect(self.add_button, QtCore.SIGNAL("clicked()"), self.add_item)
self.connect(self.save_button, QtCore.SIGNAL("clicked()"), self.save_tree)
self.added_item_count=0
def add_item(self): # Adds an item to whatever is selected
self.added_item_count+=1
label=str(self.added_item_count)
new_item=QtGui.QTreeWidgetItem(self.tree.currentItem())
new_item.setText(0,label)
self.tree.setCurrentItem(new_item)
def restore_item(self,datastream,item,num_childs):
for i in range(0, num_childs):
child=QtGui.QTreeWidgetItem(item)
child.read(datastream)
num_childs=datastream.readUInt32()
self.restore_item(datastream,child,num_childs)
def save_item(self,item,datastream):
num_childs=item.childCount()
for i in range(0,num_childs):
child = item.child(i)
child.write(datastream)
num_childs=child.childCount()
datastream.writeUInt32(num_childs)
self.save_item(child,datastream)
def save_tree(self):
file = QtCore.QFile('native_tree_save.qfile')
file.open(QtCore.QIODevice.WriteOnly)
datastream = QtCore.QDataStream(file)
self.save_item(self.tree.invisibleRootItem(),datastream)
if __name__=='__main__':
app = QtGui.QApplication(sys.argv)
window = TreeExperiment()
window.resize(200, 120)
window.show()
sys.exit(app.exec_())
在one of my other answers中,对于一个类似的问题,我编写了一个简单的演示,它序列化为xml。在
同样的代码可以很容易地适应QDataStream。我并不是真的推荐这个解决方案(可能有几十种不同的方法来实现同一个目标),但它至少提供了一个有效的例子:
我来展示一下我用过的方法。希望我在知道如何解决自己的问题方面没有不公平的优势:-)
如果有人有一个更清洁或更Python采取这一点,请跟进。谢谢!在
QTreeWidget是一个红鲱鱼。您保存的是一个通用的qabstractemodel(}的支持。您只需要选择一个树遍历(深度优先、宽度优先或其他方式),并将项及其在树中的深度转储到流中。当您读取流时,这些信息足以重建树。在
treeWidget->model()
)-毕竟,QTreeWidget
是一个视图,并且有一个内置的模型。现在,这些模型的项只是QVariant
s,那些只是Python类型,但也完全受{相关问题 更多 >
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