在 tkinter ttk treeview 中格式化单个单元格/项目而不是整行

Question

我目前正在使用一个函数以电子表格样式格式显示 pandas 数据框。我希望能够添加一些功能来根据它们的内容格式化树视图的各个单元格，例如如果它们包含子字符串 'X' 或者它们的值高于 Y。

目前实现的更新功能如下：

   def updateTree(self, dataframe):
    '''
    Updates the treeview with the data in the dataframe
    parameter
    '''
    #Remove any nan values which may have appeared in the dataframe parameter
    df = dataframe.replace(np.nan,'', regex=True)

    #Currently displayed data
    self.treesubsetdata = dataframe

    #Remove existing items
    for item in self.tree.get_children(): self.tree.delete(item)
    #Recreate from scratch the columns based on the passed dataframe
    self.tree.config(columns= [])
    self.tree.config(columns= list(dataframe.columns))

    #Ensure all columns are considered strings and write column headers
    for col in dataframe.columns:
        self.tree.heading(col,text=str(col))

    #Get number of rows and columns in the imported script
    self.rows,self.cols = dataframe.shape

    #Populate data in the treeview
    for row in dataframe.itertuples():
        self.tree.insert('', 'end',values = tuple(row[1:]))

    #Minimise first column
    self.tree.column('#0',width=0)
    self.tree.update()

任何人都可以确认您实际上可以编辑评论中的单个单元格吗？

如果是，有什么想法可以实现吗？

Answer 1

无法在 Treeview 中设置单个单元格的样式；只有整行可以使用标签属性。

如果您只想要一个值表，那么我建议您只使用 ttk.Label 小部件，您可以通过多种方式对其进行格式化。例如：

import Tkinter as tk
import ttk
import pandas as pd
from random import randrange

PADDING = dict(padx=3, pady=3)
class GridView(tk.Frame):
    def __init__(self, master=None, **kwargs):
        tk.Frame.__init__(self, master, **kwargs)
        self.labels = []
        style = ttk.Style()
        style.configure("red.TLabel", background='red')
        style.configure("green.TLabel", background='green')
        style.configure("header.TLabel", font = '-weight bold')

    def set(self, df):
        self.clear()
        for col, name in enumerate(df.columns):
            lbl = ttk.Label(self, text=name, style='header.TLabel')
            lbl.grid(row=0, column=col, **PADDING)
            self.labels.append(lbl)

        for row, values in enumerate(df.itertuples(), 1):
            for col, value in enumerate(values[1:]):
                lbl = ttk.Label(self, text=value, style=self.get_style(value))
                lbl.grid(row=row, column=col, **PADDING)
                self.labels.append(lbl)

    @staticmethod
    def get_style(value):
        if value > 70:
            return "red.TLabel"
        elif value < 30:
            return "green.TLabel"
        else:
            return None

    def clear(self):
        for lbl in self.labels:
            lbl.grid_forget()
        self.labels = []

class GUI(tk.Frame):
    def __init__(self, master=None, **kwargs):
        tk.Frame.__init__(self, master, **kwargs)
        self.table = GridView(self)
        self.table.pack()
        btn = ttk.Button(self, text="populate", command=self.populate)
        btn.pack()
        btn = ttk.Button(self, text="clear", command=self.table.clear)
        btn.pack()

    def populate(self):
        self.table.set(new_rand_df())

def main():
    root = tk.Tk()
    win = GUI(root)
    win.pack()
    root.mainloop()

def new_rand_df():
    width = 5
    height = 5
    return pd.DataFrame([[randrange(100) for _ in range(width)] for _ in range(height)], columns = list('abcdefghijklmnopqrstuvwxyz'[:width]))

if __name__ == '__main__':
    main()

Answer 2

这可以使用 Gtk3 中的自定义单元渲染器来实现，例如：

import gi
gi.require_version( 'Gtk', '3.0' )
from gi.repository import Gtk, GObject


class My_CellRendererText( Gtk.CellRendererText ):
    def __init__( self ):
        super().__init__()

    def do_render( self, cr, widget, background_area, cell_area, flags ):
        cell_text = self.props.text
        self.props.underline = ( "X" in cell_text )
        self.props.weight = 700 if ( cell_text.isdigit() and int( cell_text ) > 3 ) else 400
        return Gtk.CellRendererText.do_render( self, cr, widget, background_area, cell_area, flags )

GObject.type_register( My_CellRendererText )