如何在使用QAbstractTableModel(模型/视图)时将“Select one ...”添加到QComboBox?
问题描述:
我使用的是QAbstractTableModel
来填充QComboBox
。这很好,但我希望总是有第一个组合框索引包含“Select one ...”的值。如何在使用QAbstractTableModel(模型/视图)时将“Select one ...”添加到QComboBox?
这是可能的,如果是这样 - 如何?
我有一个combobox
,我设置了一个模型来:
model = ProjectTableModel(projects)
combobox.setModel(model)
我的模型:
class ProjectTableModel(QtCore.QAbstractTableModel):
def __init__(self, projects=[], parent=None):
QtCore.QAbstractTableModel.__init__(self, parent)
self._projects = projects
def rowCount(self, parent):
return len(self._projects)
def columnCount(self, parent):
return 2
def data(self, index, role):
row = index.row()
column = index.column()
if role == QtCore.Qt.DisplayRole and column == 0:
# Set the item's text
project = self._projects[row]
name = project.name()
return name
elif role == QtCore.Qt.UserRole and column == 0:
# Set the "itemData"
project = self._projects[row]
id = project.id()
return id
答
获得时,可以添加适当的条件/设定值,并调整行数/数量(如有必要)。下面的示例显示了如何执行此操作,但应仔细检查所有代码,以确保在访问_projects
项目时总是可以正确调整该行。 (并且请注意,不需要在访问模型本身中的行时调整行号)。
class ProjectTableModel(QtCore.QAbstractTableModel):
def __init__(self, projects=[], parent=None):
QtCore.QAbstractTableModel.__init__(self, parent)
self._projects = projects
def rowCount(self, parent):
return len(self._projects) + 1 # adjust row count
def columnCount(self, parent):
return 2
def data(self, index, role):
row = index.row() - 1 # adjust row number
column = index.column()
if role == QtCore.Qt.DisplayRole and column == 0:
if row >= 0:
# Set the item's text
project = self._projects[row]
return project.name()
else:
return 'Select one...'
elif role == QtCore.Qt.UserRole and column == 0 and row >= 0:
# Set the "itemData"
project = self._projects[row]
id = project.id()
return id
def setData(self, index, value, role):
row = index.row() - 1 # adjust row number
column = index.column()
# ignore the first item in the model
if role == QtCore.Qt.DisplayRole and column == 0 and row >= 0:
project = self._projects[row]
project.setName(value) # or whatever