我一直在使用此处找到的代码：
How to limit number of decimal places to be displayed in Gtk CellRendererText
成功格式化树视图编号列几年。但是，当我使用循环插入列时，这些列显示的是第一列的数据，而不是我期望从ListStore获得的数据。为什么是这样？我已经为此努力了一段时间，这可能是一个非常简单的解决方案，但是我却一无所知！非常感谢你。这是一个显示我的问题的工作示例：
from gi.repository import Gtk, Gdk
class myClass:
def __init__(self):
# Setup
self.iListstore = Gtk.ListStore(str, float, float, float, float)
self.iListstore.append(['abc',209.8967,568.56432, 1, 2])
self.iListstore.append(['def',2409.846,559.534, 3, 4])
self.window = Gtk.Window()
self.iTreeView = Gtk.TreeView(self.iListstore)
# Column 0
lblr= Gtk.CellRendererText()
lcol = Gtk.TreeViewColumn('Row Label')
self.iTreeView.append_column(lcol)
lcol.pack_start(lblr, True)
lcol.add_attribute(lblr, 'text',0)
# Column 1
cr = Gtk.CellRendererText(xalign=1)
myCol = Gtk.TreeViewColumn('Col1')
myCol.set_sort_column_id(1)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',1)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,1)[0],2))))
# Column 2
myCol = Gtk.TreeViewColumn('Col2')
myCol.set_sort_column_id(2)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',2)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,2)[0],2))))
# The above works but the following does not. Col3 has the same value as Col4. Can someone tell me the reason a loop can not be used with the code?
colNames=['Col3','Col4']
for i in range(3,5):
myCol = Gtk.TreeViewColumn(colNames[i-3]) # I realize this is a bit of a fudge
myCol.set_sort_column_id(i)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',i)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,i)[0],2))))
# Window
self.window.add(self.iTreeView)
self.window.show_all()
def main(self):
Gtk.main()
p=myClass()
p.main()
答案 0 :(得分：0)
我真的试图使用Libeforce的链接来启用lambda函数（再次感谢！），但无法解决。根据{{3}}，“诀窍在于记住循环不会创建新的作用域”，因此，下一列永远不会更改。我打破了功能，现在代码可以工作：
from gi.repository import Gtk, Gdk
import inspect
class myClass:
def __init__(self):
# Setup
self.iListstore = Gtk.ListStore(str, float, float, float, float)
self.iListstore.append(['abc',209.8967,568.56432, 1, 2])
self.iListstore.append(['def',2409.846,559.534, 3, 4])
self.window = Gtk.Window()
self.iTreeView = Gtk.TreeView(self.iListstore)
self.window.add(self.iTreeView) # moved to avoid an error of adding TreeView twice to Window
# Column 0
lblr= Gtk.CellRendererText()
lcol = Gtk.TreeViewColumn('Row Label')
self.iTreeView.append_column(lcol)
lcol.pack_start(lblr, True)
lcol.add_attribute(lblr, 'text',0)
# Column 1
cr = Gtk.CellRendererText(xalign=1)
myCol = Gtk.TreeViewColumn('Col1')
myCol.set_sort_column_id(1)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',1)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,1)[0],2))))
# Column 2
myCol = Gtk.TreeViewColumn('Col2')
myCol.set_sort_column_id(2)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',2)
myCol.set_cell_data_func(cr,lambda column, cell, model, iter, unused:cell.set_property("text","{0:.2f}".format(round(model.get(iter,2)[0],2))))
# The above works and the following now works. Could not figure out how to use lambda properly so broke the function out into roundCell
colNames=['Col3','Col4']
for i in range(3,5):
myCol = Gtk.TreeViewColumn(colNames[i-3])
myCol.set_sort_column_id(i)
self.iTreeView.append_column(myCol)
myCol.pack_start(cr, True)
myCol.add_attribute(cr, 'text',i)
myCol.set_cell_data_func(cr, self.roundCell,i)
# Window
self.window.show_all()
def roundCell(self, col, myCell, mdl, itr,i):
# col =Columnn, myCell = Cell, mdl = model, itr = inter, i = column number
# We don't use column, but it is provided by the function
myCell.set_property("text","{0:.2f}".format(round(mdl.get(itr,i)[0],2)))
def main(self):
Gtk.main()
p=myClass()
p.main()
答案 1 :(得分：0)
确实，set_cell_data_func 是在 treeviewcolumn 单元格中格式化文本的关键点。我简化了上面的答案，所有这些都是通过 for 循环一次性完成的。对于真正的格式，您可以使用新的 f-string 功能。
import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk, Gdk
class myClass:
def __init__(self):
# Setup
self.window = Gtk.Window()
iListstore = Gtk.ListStore(str, float, float, float, float)
iListstore.append(['abc',209.8967,568.56432, 1, 2])
iListstore.append(['def',2409.846,559.534, 3, 4])
self.iTreeView = Gtk.TreeView(model=iListstore)
self.window.add(self.iTreeView)
treeview_columns = ['Row Label', 'Col1', 'Col2', 'Col3', 'Col4']
for col_num, name in enumerate(treeview_columns):
# align text in column cells of row (0.0 left, 0.5 center, 1.0 right)
rendererText = Gtk.CellRendererText(xalign=1.0, editable=False)
column = Gtk.TreeViewColumn(name ,rendererText, text=col_num)
column.set_cell_data_func(rendererText, self.celldatafunction, func_data=col_num)
# center the column titles in first row
column.set_alignment(0.5)
# make all the column reorderable, resizable and sortable
column.set_sort_column_id(col_num)
column.set_reorderable(True)
column.set_resizable(True)
self.iTreeView.append_column(column)
# Window
self.window.connect("destroy", Gtk.main_quit)
self.window.show_all()
def celldatafunction(self, col, cell, mdl, itr, i):
# col = Columnn, cell = Cell, mdl = model, itr = iter, i = column number
# column is provided by the function, but not used
value = mdl.get(itr,i)[0]
if type(value) is not str:
cell.set_property('text',f'{value+0.005:.2f}')
path = mdl.get_path(itr)
row = path[0]
colors = ['white', 'lightskyblue']
# set alternating backgrounds
cell.set_property('cell-background', colors[row % 2])
def main(self):
Gtk.main()
p = myClass()
p.main()