1

我试图限制 Gtk.CellRendererText 中显示的小数位数。目前，浮点数字段显示有 6 个小数位，但我希望只有 1 个。

在此处输入图像描述

此测试代码应该可以在 Linux 上运行：

#!/usr/bin/python3
from gi.repository import Gtk

class MyWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="Hello World")
        self.set_default_size(200, 200)

        self.liststore = Gtk.ListStore(float)
        treeview = Gtk.TreeView(model=self.liststore)

        self.liststore.append([9.9])
        self.liststore.append([1])

        xrenderer = Gtk.CellRendererText()
        xrenderer.set_property("editable", True)
        xcolumn = Gtk.TreeViewColumn("Float Numbers", xrenderer, text=0)
        xcolumn.set_min_width(100)
        xcolumn.set_alignment(0.5)
        treeview.append_column(xcolumn)

        self.add(treeview)

win = MyWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()
4

3 回答 3

7

绊倒了同样的问题。基本上你想要做的是使用你的 GtkTreeViewColumn 的 set_cell_data_func 来设置渲染函数，这会改变单元格的“文本”属性。就您的示例而言，请尝试添加以下行：

xcolumn.set_cell_data_func(xrenderer, \
    lambda col, cell, model, iter, unused:
        cell.set_property("text", "%g" % model.get(iter, 0)[0]))

参考：

于 2015-01-30T20:07:11.227 回答
2

在上述基础上构建一个 2 位数的 Money 渲染器。我们将text=3liststore 索引作为func_data（它是unusedlyngvi 使用的参数）传递。

我不确定如何从单元格渲染器中读取“数字”属性，以使此代码可重用于任意数量的数字，但这适用于金钱。我也可以为通用字符串格式重构它。

https://developer.gnome.org/pygtk/stable/class-gtktreeviewcolumn.html#method-gtktreeviewcolumn--set-cell-data-func

class MoneyCellRenderer(Gtk.CellRendererSpin):
    def __init__(self):
        super().__init__()
        self.set_property("editable", True)
        self.set_property("digits", 2)
        adjustment = Gtk.Adjustment(0, 0, sys.maxsize, 0.01, 1.00, 1.00)
        self.set_property("adjustment", adjustment)

# Only show 2 digits
# https://stackoverflow.com/questions/27675919/how-to-limit-number-of-decimal-places-to-be-displayed-in-gtk-cellrenderertext
# https://developer.gnome.org/pygtk/stable/class-gtktreeviewcolumn.html#method-gtktreeviewcolumn--set-cell-data-func
def moneyCellDataFunc(treeViewColumn, cellRenderer, model, iter, column):
    val = model.get(iter, column)
    val = val[0]
    val = "{:.2f}".format(val) # TODO get cell_rendere.digits
    return cellRenderer.set_property("text", val)

class MoneyTreeViewColumn(Gtk.TreeViewColumn):
    def __init__(self, title, cell_renderer, text=0):
        super().__init__(title, cell_renderer, text=text)
        self.set_cell_data_func(cell_renderer, moneyCellDataFunc, text)
于 2018-04-20T17:59:48.727 回答
0

感谢lyngvi，我现在使用这个稍微修改过的代码将树视图中的值四舍五入并截断到小数点后一位：

    def truncate(self, number):
        """
        Rounds and truncates a number to one decimal place. Used for all
        float numbers in the data-view. The numbers are saved with full float
        precision.
        """
        number = round(number, 1)
        return number

    renderer_dir = Gtk.CellRendererText()
    renderer_dir.set_property("editable", True)
    column_dir = Gtk.TreeViewColumn("Dir", renderer_dir, text=0)
    column_dir.set_alignment(0.5)
    column_dir.set_expand(True)
    column_dir.set_cell_data_func(renderer_dir, \
                lambda col, cell, model, iter, unused:
                cell.set_property("text",
                "{0}".format(self.truncate(model.get(iter, 0)[0]))))
    self.append_column(column_dir)
于 2015-02-09T15:56:33.933 回答