我正在尝试编写简单的属性编辑器。我已经自动生成了 pyqt 类（下面代码中的 WorkZone），我需要使用 PropertyEditor 查看/编辑它的一些属性，使用委托 PropertyEditorDelegate，使用自定义编辑器 ColorEditor、LineEditor 等。
主要思想是 WorkZone 知道需要编辑哪些属性以及如何编辑，PropertyEditor 解析 WorkZone，寻找这样的属性，并用它们的值填充 QTreeWidget。
但是有一个问题：delegate 不会在双击、“Enter”或 smth 时开始编辑。它被添加到右行，它绘制项目，但仅此而已。此外，当我将 Propertyeditor 容器的类型切换为 QTableWidget 时，委托开始更正常地工作（但编辑器绘制在屏幕的一角，而不是在表格中）！
PS。还有一个问题：有没有什么方法可以将一些代表添加到行中，而无需将它们的实例存储在其他地方（脚本中的 self._delegates），这很丑陋。方法 setItemDelegate 接受指向委托的指针，并且在 C++ 中它获得了它的所有权，但在 PyQT 中并非如此......此外，例如，setItem 没有这样的问题。
以下脚本说明了问题：
# -*- coding: utf-8 -*-
#!/usr/bin/env python
from PyQt4 import QtCore, QtGui
import inspect
class LineEditor(QtGui.QLineEdit):
def __init__(self, name = None, parent = None, slot = None):
QtGui.QLineEdit.__init__(self, parent)
self.textChanged.connect(slot)
self.name = name
@staticmethod
def paintForDelegate(delegate, painter, option, index):
QtGui.QItemDelegate.paint(delegate, painter, option, index)
def get(self):
return str(self.text())
def set(self, val):
self.setText(QtCore.QString.fromUtf8(val))
class ColorEditor(QtGui.QComboBox):
def _populateList(self):
for name in QtGui.QColor.colorNames():
self.addItem(name)
index = self.findText(name)
self.setItemData(index, QtGui.QColor(name), QtCore.Qt.DecorationRole)
def __init__(self, name = None, parent = None, slot = None):
QtGui.QComboBox.__init__(self, parent)
self._populateList()
self.currentIndexChanged.connect(slot)
self.name = QtCore.QString.fromUtf8(name)
@staticmethod
def paintForDelegate(delegate, painter, option, index):
QtGui.QItemDelegate.paint(delegate, painter, option, index)
def get(self):
qColor = QtGui.QColor(self.itemData(self.currentIndex(), QtCore.Qt.DecorationRole))
color = ((qColor.blue() | (qColor.green() << 8)) | (qColor.red() << 16))
return color
def set(self, val):
blue = (val & 255)
green = ((val & 65280) >> 8)
red = ((val & 16711680) >> 16)
color = QtGui.QColor(red, green, blue)
index = self.findData(color, QtCore.Qt.DecorationRole)
self.setCurrentIndex(index)
class PropertyEditorDelegate(QtGui.QItemDelegate):
def __init__(self, object, propName, parent = None):
QtGui.QItemDelegate.__init__(self, parent)
self._object = object
self._propName = propName
def paint(self, painter, option, index):
self._object.paintForDelegate(self._propName, self, painter, option, index)
def createEditor(self, parent, option, index):
return self._object.createEditor(self._propName)
def setEditorData(self, editor, index):
value = index.model().data(index, QtCore.Qt.EditRole)
editor.set(value)
def setModelData(self, editor, model, index):
if index.column() == 0:
model.setData(index, editor.name, QtCore.Qt.EditRole)
else:
model.setData(index, editor.get(), QtCore.Qt.EditRole)
def updateEditorGeometry(self, editor, option, index):
editor.setGeometry(option.rect)
class PropertyEditor(QtGui.QWidget):
def __init__(self, parent = None):
QtGui.QWidget.__init__(self, parent)
self._object = None
self._delegates = []
self._mainLayout = QtGui.QVBoxLayout()
self._mainLayout.setContentsMargins(2, 2, 2, 2)
self._mainLayout.setSpacing(2)
self.setLayout(self._mainLayout)
self._contents = QtGui.QTreeWidget()
self._contents.setColumnCount(2)
self._contents.currentItemChanged.connect(self.printCurrent)
self._mainLayout.addWidget(self._contents)
def printCurrent(self, curr, prev):
print self._contents.currentIndex().row()
print self._contents.currentIndex().column()
print self._contents.itemDelegate(self._contents.currentIndex())._propName
print self._contents.itemDelegate(self._contents.currentIndex())
def object(self):
return self._object
def setObject(self, value):
self._object = value
def isProperty(p):
return isinstance(p, property)
for (name, value) in inspect.getmembers(type(self._object), isProperty):
if self._object.isEditable(name):
item = QtGui.QTreeWidgetItem()
item.setData(0, QtCore.Qt.EditRole, QtCore.QString.fromUtf8(self._object.getPropertyName(name)))
item.setData(1, QtCore.Qt.EditRole, self._object.get(name))
self._contents.addTopLevelItem(item)
self._delegates.append(PropertyEditorDelegate(self._object, name, self._contents))
index = self._contents.indexOfTopLevelItem(item)
self._contents.setItemDelegateForRow(index, self._delegates[index])
class WorkZone(object):
def __init__(self):
self._name = ''
self.currentEditor = None
self.red = 100
self.green = 100
self.blue = 100
self._width = 1
def _getColor(self):
color = ((self.blue | (self.green << 8)) | (self.red << 16))
return color
def _setColor(self, color):
self.blue = (color & 255)
self.green = ((color & 65280) >> 8)
self.red = ((color & 16711680) >> 16)
color = property(_getColor, _setColor)
def currentColorChanged(self, index):
if self.currentEditor is not None:
self.color = self.currentEditor.get()
print self.color
def currentNameChanged(self, newName):
if self.currentEditor is not None:
self.name = self.currentEditor.get()
print self.name
def createEditor(self, prop):
if prop == 'color':
self.currentEditor = ColorEditor('Color', None, self.currentColorChanged)
self.currentEditor.set(self.color)
return self.currentEditor
elif prop == 'name':
self.currentEditor = LineEditor('Name', None, self.currentNameChanged)
self.currentEditor.set(self.name)
return self.currentEditor
else:
return None
def releaseEditor(self):
self.currentEditor = None
def isEditable(self, prop):
if prop == 'color':
return True
elif prop == 'name':
return True
else:
return False
def set(self, prop, val):
if prop == 'color':
self.color = val
elif prop == 'name':
self.name = val
def get(self, prop):
if prop == 'color':
return self.color
elif prop == 'name':
return self.name
def getPropertyName(self, prop):
if prop == 'color':
return 'Color'
elif prop == 'name':
return 'Name'
def paintForDelegate(self, prop, delegate, painter, option, index):
if prop == 'color':
ColorEditor.paintForDelegate(delegate, painter, option, index)
elif prop == 'name':
LineEditor.paintForDelegate(delegate, painter, option, index)
def _setWidth(self, Width):
self._width = Width
def _getWidth(self):
return self._width
width = property(_getWidth, _setWidth)
def _getName(self):
return self._name
def _setName(self, val):
self._name = val
name = property(_getName, _setName)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
zone = WorkZone()
zone.color = 0
zone.width = 1
propertyEditor = PropertyEditor()
propertyEditor.setObject(zone)
propertyEditor.show()
sys.exit(app.exec_())