[英]Dynamically add columns in Tkinter treeview
该程序应该动态添加列,以便在按下相应按钮时显示更多数据。 可以按不同顺序按下按钮,这会影响下一列/标题的外观。 正如您在示例程序中看到的,标题没有正确更新。 表中仅显示最后一个。 如果项目(选中的行和列)已经有数据,应该更新,但目前数据只添加到新列中,所以问题之一是如何更新选中的行和标题引用的项目。 删除行后,应删除所有空列。 我试图通过连接元组来更新列,但不知道如何处理标题。 任何建议都非常感谢。
from random import randint
from tkinter import *
from tkinter.ttk import Treeview
def get_window():
root = Tk()
root.resizable(width=True, height=True)
root.geometry("823x458")
root.title("PsControl")
return root
def get_top_frame(root):
frame = Frame(root)
frame.name = 'top_frame'
frame.root = root
frame.pack(side=TOP, expand=False, fill=X)
button1 = Button(frame, text="Add Row", command=lambda: tv.insert('', 'end', text="hostname"))
button1.grid(row=0, column=1)
button1 = Button(frame, text="Add Cow 1", command=lambda: tv_insert("H1", randint(1, 100)))
button1.grid(row=0, column=2)
button2 = Button(frame, text="Add Cow 2", command=lambda: tv_insert("H2", randint(1, 100)))
button2.grid(row=0, column=3)
button3 = Button(frame, text="Add Cow 3", command=lambda: tv_insert("H3", randint(1, 100)))
button3.grid(row=0, column=4)
button4 = Button(frame, text="Add Cow 20", command=lambda: tv_insert("H4", randint(1, 100)))
button4.grid(row=0, column=5)
button5 = Button(frame, text="Delete row", command=lambda: tv.delete(tv.selection()))
button5.grid(row=0, column=6)
def get_bottom_frame(root):
global tv
frame = Frame(root, highlightbackground='#3E4149', highlightthickness=1, borderwidth=2)
frame.name = 'bottom_frame'
frame.root = root
h = Scrollbar(root, orient='horizontal')
h.pack(side=BOTTOM, fill=X)
v = Scrollbar(root)
v.pack(side=RIGHT, fill=Y)
frame.pack(side=BOTTOM, expand=True, fill=BOTH)
frame.config(background='#FFFFFF')
tv = Treeview(frame, xscrollcommand=h.set, yscrollcommand=v.set)
tv.column("#0", width=135, minwidth=35, stretch=NO)
tv.heading("#0", text='Host', anchor='w')
tv.pack(expand=True, fill='both')
h.config(command=tv.xview)
v.config(command=tv.yview)
def tv_insert(heading, insert_data):
selection = tv.selection()
columns = tv["columns"]
if columns == '':
tv["columns"] = (heading,)
tv.column(heading, width=135, minwidth=35, stretch=NO)
tv.heading(heading, text=heading, anchor='w')
tv.item(selection, values=insert_data)
else:
new_col = columns + (heading,)
tv["columns"] = new_col
tv.heading(heading, text=heading, anchor='w')
data = tv.item(selection, "values")
if data == '':
tv.item(selection, values=insert_data)
else:
new_data = data + (insert_data,)
tv.item(selection, values=new_data)
def delete_row():
selection = tv.selection()
tv.delete(selection)
root = get_window()
get_top_frame(root)
get_bottom_frame(root)
root.mainloop()
感谢@acw1668,这里是按预期完成工作的代码。 欢迎提出任何改进建议。
def tv_insert(heading, insert_data):
selection = tv.selection()
columns = tv["columns"]
if columns == '': # if no columns, create column, heading and item.
tv["columns"] = (heading,)
tv.column(heading, width=135, minwidth=35, stretch=NO)
tv.heading(heading, text=heading, anchor='w')
tv.item(selection, values=(insert_data,))
else:
headings = [tv.heading(col) for col in columns] # save current headings
if heading not in columns:
new_col = columns + (heading,)
tv["columns"] = new_col
# restore previous headings
for h in headings:
tv.heading(h['text'], text=h['text'], anchor=h['anchor'])
# set new heading
tv.heading(heading, text=heading, anchor='w')
# add data/item with with size of the columns
len_col = len(new_col)
data = ['' for _ in range(len_col)] # Create an empty list
data[len_col - 1] = insert_data # Update the next
tv.item(selection, values=tuple(data))
else:
data = tv.item(selection, "values")
# if heading exist but no item on the the selected row
if data == '':
data = ['' for _ in range(len(headings))]
index = columns.index(heading)
data[index] = insert_data
tv.item(selection, values=tuple(data))
else:
data = list(data)
if len(data) < len(columns):
new_data = ['' for _ in range(len(columns))]
for i, d in enumerate(data):
new_data[i] = d
index = columns.index(heading)
new_data[index] = insert_data
tv.item(selection, values=tuple(new_data))
else:
index = columns.index(heading)
data[index] = insert_data
tv.item(selection, values=tuple(data))
由于您已将新列分配给tv
,因此标题信息将丢失。 您应该在分配新列之前保存当前标题信息,并在以下时间恢复它们:
def tv_insert(heading, insert_data):
selection = tv.selection()
columns = tv["columns"]
if columns == '':
tv["columns"] = (heading,)
tv.column(heading, width=135, minwidth=35, stretch=NO)
tv.heading(heading, text=heading, anchor='w')
tv.item(selection, values=insert_data)
else:
headings = [tv.heading(col) for col in columns] # save current headings
new_col = columns + (heading,)
tv["columns"] = new_col
# restore previous headings
for h in headings:
tv.heading(h['text'], text=h['text'], anchor=h['anchor'])
# set new heading
tv.heading(heading, text=heading, anchor='w')
data = tv.item(selection, "values")
if data == '':
tv.item(selection, values=insert_data)
else:
new_data = data + (insert_data,)
tv.item(selection, values=new_data)
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