仅在 treeview 小部件/tkinter

编程问答 2022-04-21

问题描述

在过去的几个小时里，我一直被困在这个问题上，似乎无法弄清楚为什么代码的行为如此，因此寻求任何帮助。基本上我在 tkinter python 3.6 中有一个树视图小部件，有 60000 多个项目。我创建了一个 onTripleClick 函数，“理想情况下”应该突出显示具有特定样式（使用标签）的第一个点击项目，并且当下一个项目是三重点击时，先前样式的项目应该回到原始状态（使用另一个标签）而新点击应该呈现样式状态。出于某种原因，只有第一个 tag_configure 被执行 - 如果我注释掉第一个 tag_configure，那么第二个 tag_configure 也会被执行 - 当第二个 tag_configure 满足 IF 条件时，我需要它们都被执行。非常感谢任何建议！

编辑：根据要求 - 我已经包含了一个最小版本的工作代码，上面解释的想法是用一种样式（trClicked 标签）突出显示三个左击行，当另一行三次单击时，先前单击的项目返回到原始状态（普通标签），而新项目采用样式（trClicked 标签）。按原样运行代码，然后注释掉第 9 行的第一个 tree.tag_configure() 位 - 并重新运行。这次第二个 tree.tag_configure(){line14} 被执行——我需要它们同时执行。谢谢！

from tkinter import *
from tkinter import ttk

def onTripleClick(event):
    global selectedSigName,selectedSigPath,trClickedItemiid,toBeClearedItemiid
    itemSelection = tree.selection()[0] 
    
    trClickedItemiid = tree.focus()
    tree.tag_configure('trClicked'+str(trClickedItemiid),background='light green',foreground='black',font=( 'Helvetica',8,'bold','italic')) # font=(family,size,weight,slant,underline,overstrike) 
    # tree.tag_bind('trClicked'+str(trClickedItemiid),'<1>',trClickedItemiid)
    prevTrClicked.append(trClickedItemiid)
    if len(prevTrClicked) > 1:
        toBeClearedItemiid = prevTrClicked.pop(0) # pop the 0th index and pass it to normal
        tree.tag_configure('normal'+str(toBeClearedItemiid),background='pink',font=( 'Courier','normal','roman'))
        # tree.tag_bind('normal'+str(toBeClearedItemiid),toBeClearedItemiid)


# Create main root object of TK class
root = Tk()
root.title('MyTreeview')
root.geometry("700x500")

# create frame to house treeview AND scrollbar
frame = Frame(root)
frame.pack(pady=5)

tree = ttk.Treeview(frame,height=20,selectmode="browse")
tree.pack(side=LEFT)
tree['columns'] = ("Column1","Column2","Column3")

#Format Columns
tree.column("#0",width=10,minwidth=10) # this is where the plus icon will live
tree.column("Column1",anchor=W,width=150)
tree.column("Column2",width=300)
tree.column("Column3",width=120)

# Create headings
tree.heading("#0",text="",anchor=W)
tree.heading("Column1",text="Column1",anchor=W)
tree.heading("Column2",text="Column2",anchor=W)
tree.heading("Column3",text="Column3",anchor=W)

# to be used by TrClicked Function for helping clear older clicked items
global prevTrClicked
prevTrClicked = [] #

rows= [
    ['TopMostParent1','2ndParent-ColE','ColF-3rdParent'],['TopMostParent2','5thParent-ColE','ColF-1stParent'],['TopMostParent3','4thParent-ColE','ColF-2ndParent'],['TopMostParent4',['TopMostParent6','3rdParent-ColE',['TopMostParent5','ColF-3rdParent']
]
count=0
for row in rows:
    tree.insert(parent='',index='end',iid=count,text='',tags=('trClicked'+str(count),'normal'+str(count)),values=(row[0],row[1],row[2]))
    count+=1


tree.bind("<Triple-1>",onTripleClick)
# tree.tag_bind('trClicked'+str(trClickedItemiid),trClickedItemiid)
# tree.tag_bind('normal'+str(toBeClearedItemiid),toBeClearedItemiid)

root.mainloop()

解决方法

就您而言，列表中标签的顺序很重要

如果我们改变这个


tags=('trClicked'+str(count),'normal'+str(count))

到这里


tags=('normal'+str(count),'trClicked'+str(count))

这次替换后，之前的元素变成粉红色。 你会看到相反的结果：变成粉红色的元素将不再变成绿色。

解决方案

您对两个标签（背景、前景、字体）使用相同的样式属性。 在这种情况下，单个 trClicked 标签就足够了。 您将仅根据事件更改样式属性值。

如果您使用一个标签（'trClicked'）：


tree.tag_configure('trClicked'+str(trClickedItemiid),background='light green',foreground='black',font=( 'Helvetica',8,'bold','italic'))

...

tree.tag_configure('trClicked'+str(toBeClearedItemiid),background='pink',font=( 'Courier','normal','roman'))

然后，一般来说，一切正常。

完整示例


from tkinter import *
from tkinter import ttk


# to be used by TrClicked Function for helping clear older clicked items
global clicked_queue
clicked_queue = [] # last 3 items


def onTripleClick(event):
    global clicked_queue
    # 'trClicked'+iid  - a unique tag for each item

    # the iid (string) of the item that currently has focus,or '' if no item has focus 
    current_item_iid = event.widget.focus()
    if not current_item_iid:
        return
    print(event.widget.item(current_item_iid))
    print("current:",current_item_iid) # iid=count   

    if clicked_queue:
        # get the previous item,the last one in the queue
        prev_item_iid = clicked_queue[-1]
        print("prev item:",prev_item_iid)
        
        if prev_item_iid == current_item_iid:
            return
        
        tree.tag_configure('trClicked'+prev_item_iid,'roman'))
    
    tree.tag_configure('trClicked'+current_item_iid,'italic'))

    # add current item to the right side of the queue
    clicked_queue.append(current_item_iid)
    print("new prev item:",current_item_iid)
    
    if len(clicked_queue) == 3:
        # get and remove an element from the left side of the queue
        prev_prev_item_iid = clicked_queue[0]
        clicked_queue.remove(prev_prev_item_iid)
        
        if prev_prev_item_iid == current_item_iid:
            return
        
        # return to the default style
        tree.tag_configure('trClicked'+prev_prev_item_iid,background='white','roman'))


# Create main root object of TK class
root = Tk()
root.title('MyTreeview')
root.geometry("700x500")

# create a consistent style for the background and font
style = ttk.Style()
style.configure('Treeview','roman'))

# create frame to house treeview AND scrollbar
frame = Frame(root)
frame.pack(pady=5)

tree = ttk.Treeview(frame,height=20,selectmode="browse")
tree.pack(side=LEFT)
tree['columns'] = ("Column1","Column2","Column3")

#Format Columns
tree.column("#0",width=10,minwidth=10) # this is where the plus icon will live
tree.column("Column1",anchor=W,width=150)
tree.column("Column2",width=300)
tree.column("Column3",width=120)

# Create headings
tree.heading("#0",text="",anchor=W)
tree.heading("Column1",text="Column1",anchor=W)
tree.heading("Column2",text="Column2",anchor=W)
tree.heading("Column3",text="Column3",anchor=W)


rows= [
    ['TopMostParent1','2ndParent-ColE','ColF-3rdParent'],['TopMostParent2','5thParent-ColE','ColF-1stParent'],['TopMostParent3','4thParent-ColE','ColF-2ndParent'],['TopMostParent4',['TopMostParent6','3rdParent-ColE',['TopMostParent5','ColF-3rdParent']
]
count = 1  # <- start at 1 or set iid=str(count),otherwise iid=0 will default to "I001"
for row in rows:
    tree.insert(parent='',index='end',iid=count,text='',tags=('trClicked'+str(count),),values=(row[0],row[1],row[2]))
    count += 1

tree.bind("<Triple-1>",onTripleClick)

root.mainloop()
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