我有以下问题重新讨论Qt(使用PyQt 5):
我修改了我为QDataWidgetMapper和QAbstractTableModel找到的一个例子,并为角色Qt.BackgroundRole添加了一个额外的if子句给数据方法。
目标是根据模型的内容获得不同的背景颜色(例如,如果数组元素等于“错误”,则为红色背景)
适用于qlistview2,但不适用于映射到模型的qLineEdits。我知道这不是默认的QDataWidgetMapper(只是将模型的一部分逐个映射到一个小部件的一个属性)。
将其他属性/信息映射到行编辑(修改其样式,如背景颜色,可见性,启用行编辑/未启用)的最佳做法是什么?
我需要在模型中对这些属性进行计算(对于更复杂的模型),并且不希望对QLineEdit进行子类化(以实现基于QLineEdit文本内容更改颜色的特定方法)。 / p>
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from PyQt5.QtWidgets import (QWidget, QDataWidgetMapper,
QLineEdit, QApplication, QGridLayout, QListView)
from PyQt5.QtCore import Qt, QAbstractTableModel, QModelIndex
from PyQt5.QtGui import QBrush
class Window(QWidget):
def __init__(self, parent=None):
super(Window, self).__init__(parent)
# Set up the widgets.
self.nameEdit = QLineEdit()
self.nameEdit2 = QLineEdit()
# set up the layout
layout = QGridLayout()
layout.addWidget(self.nameEdit, 0, 1, 1, 1)
layout.addWidget(self.nameEdit2, 0, 2, 1, 1)
self.setLayout(layout)
self.mapper = None
def setModel(self, model):
# Set up the mapper.
self.mapper = QDataWidgetMapper(self)
self.mapper.setModel(model)
self.mapper.addMapping(self.nameEdit, 0)
self.mapper.addMapping(self.nameEdit2, 1)
self.mapper.toFirst()
class MyModel(QAbstractTableModel):
def __init__(self, data, parent=None):
QAbstractTableModel.__init__(self, parent)
self.lst = data
def columnCount(self, parent=QModelIndex()):
return len(self.lst[0])
def rowCount(self, parent=QModelIndex()):
return len(self.lst)
def data(self, index, role=Qt.DisplayRole):
row = index.row()
col = index.column()
if role == Qt.EditRole:
return self.lst[row][col]
elif role == Qt.DisplayRole:
return self.lst[row][col]
elif role == Qt.BackgroundRole:
redBackground = QBrush(Qt.red)
greenBackground = QBrush(Qt.green)
if self.lst[row][col] == "error":
return redBackground
else:
return greenBackground
def flags(self, index):
flags = super(MyModel, self).flags(index)
if index.isValid():
flags |= Qt.ItemIsEditable
flags |= Qt.ItemIsDragEnabled
else:
flags = Qt.ItemIsDropEnabled
return flags
def setData(self, index, value, role=Qt.EditRole):
if not index.isValid() or role != Qt.EditRole:
return False
self.lst[index.row()][index.column()] = value
self.dataChanged.emit(index, index)
return True
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
myModel = MyModel([['row 1 col1', 'error'],
['error', 'row 2 col2'],
['row 3 col1', 'row 3 col2'],
['error', 'row 4 col2']])
# myModel = MyModel()
mywindow = Window()
mywindow.setModel(myModel)
qlistview2 = QListView()
qlistview2.setModel(myModel)
mywindow.show()
qlistview2.show()
sys.exit(app.exec_())
答案 0 :(得分:0)
我找到了一个简单的解决方案:我必须使用自定义代理来解决问题。
class LineDelegate(QStyledItemDelegate):
def __init__(self, parent = None):
QStyledItemDelegate.__init__(self, parent)
def createEditor(self, parent, option, index):
pass
def setEditorData(self, editor, index):
editor.setText(index.model().data(index, Qt.EditRole))
color = index.model().data(index, Qt.BackgroundColorRole)
palette = QPalette()
palette.setBrush(QPalette.Base,color)
editor.setPalette(palette)
editor.repaint()
def setModelData(self, editor, model, index):
model.setData(index, editor.text(), Qt.EditRole)
由于我需要多个代理来处理两个QLineEdits,the question and answer given by AlexVhr帮助了很多。
完整修改后的源代码位于pastebin。