通过滚动在树视图中搜索答案

【问题标题】：searching in treeview with scrolling通过滚动在树视图中搜索
【发布时间】：2019-07-18 03:21:23
【问题描述】：

我正在尝试在 ttk.treeview 表中实现搜索。显然已经有一些答案，我正在使用其中一个（参见下面的代码）。但是我想扩展这个问题。

鉴于下面的代码，如何使它除了突出显示所需的元素外，视图还将滚动到该元素？
换句话说，如果列表中有更多适合视图的元素，而我们正在搜索的元素位于底部，如何将其放在视图的中间（或者顶部会更好？）在向搜索字段输入字符的过程中？此外，由于可以一次突出显示多个元素，我想我们应该滚动到第一个元素。

from tkinter import *
from tkinter import ttk

class App:
    def __init__(self, root):
        self.root = root
        self.tree = ttk.Treeview(self.root) #create tree
        self.sv = StringVar() #create stringvar for entry widget
        self.sv.trace("w", self.command) #callback if stringvar is updated
        self.entry = Entry(self.root, textvariable=self.sv) #create entry
        self.names = [
            "tawymu","uzzkhv","mimfms","qpugux","mswzaz","alexsa","khfpke",
            "fsphkn","indzsl","rmvuag","gvrmxd","vfshxx","kwpuyz","pyfmar",
        ]  # these are just test inputs for the tree
        self.ids = [] #creates a list to store the ids of each entry in the tree
        for i in range(len(self.names)):
            #creates an entry in the tree for each element of the list
            #then stores the id of the tree in the self.ids list
            self.ids.append(self.tree.insert("", "end", text=self.names[i]))
        self.tree.pack()
        self.entry.pack()
    def command(self, *args):
        self.selections = [] #list of ids of matching tree entries
        for i in range(len(self.names)):
            #the below if check checks if the value of the entry matches the first characters of each element
            #in the names list up to the length of the value of the entry widget
            if self.entry.get() != "" and self.entry.get() == self.names[i][:len(self.entry.get())]:
                self.selections.append(self.ids[i]) #if it matches it appends the id to the selections list
        self.tree.selection_set(self.selections) #we then select every id in the list

root = Tk()
App(root)
root.mainloop()

【问题讨论】：

一个解决方案是，计算第一个突出显示的行相对于scrollregion 的行位置并使用self.tree.yview_moveto(<relative pos>)。

标签： python search tkinter scroll treeview

【解决方案1】：

treeview 有一个 see 方法。

def command(self, *args):
    self.selections = []
    for i in range(len(self.names)):
        if self.entry.get() != "" and self.entry.get() == self.names[i][:len(self.entry.get())]:
            self.selections.append(self.ids[i])
    self.tree.selection_set(self.selections)
    try:
        self.tree.see(self.selections[0]) #you can iterate through the list for multiple selection
    except IndexError:
        pass

【讨论】：

【解决方案2】：

我发现了一个技巧，可以将我感兴趣的行带到窗口顶部。先翻到底，再往上翻。

tree.see(items[-1])
tree.see(items[my_target_item_n])

【讨论】：