GetSelection ComboBox

Question

当我输入时，我不知道组合框还需要什么来从列表中进行选择。最后，我将添加SetInsertionPoint。但就目前而言，我选择的项目是-1。

self.filter = wx.ComboBox(self, wx.ID_ANY, choices = '', style=wx.CB_DROPDOWN)

def OnTextChanged(self, event):
    sel = self.filter.GetSelection()
    print 'OnItemSelected %s' % sel

Answer 1

另一个这样的答案有一个自定义控件，可能对您有用：

• Auto-Completion In wxPython wxComboBox

您还可以从这篇wxPython wiki文章中获得一些想法。

• http://wiki.wxpython.org/TextCtrlAutoComplete

我还注意到，根据docs：http://www.wxpython.org/docs/api/wx.lib.masked.combobox-module.html，蒙面组合框本身可能具有此特性。

BaseMaskedComboBox -用于通用屏蔽编辑组合框的基类；允许自动完成值。

Answer 2

要单独使用GetSelection()，需要将ComboBox设置为只读。这是一种通过点击一个字符来查询的好方法。通过使用SetInsertionPoint和SetMark，可以将curser保存到查询的下一个字符串。我使用了在wxPython wxComboBox中建议.自动完成的示例，并修改了我的代码以使用这些实例。因为我总是使用盒子和打开函数，所以我需要取消wx.EVT_TEXT事件。下面是它的工作原理：

##  copy/paste to text file
'''
73,"N WASHINGTON ST"
95,"BRIAR CREEK RD"
97,"N INDEPENDENCE AVE"
09,"N ADAMS ST"
13,"N JEFFERSON ST"
19,"N MADISON ST"
21,"QUAIL CREEK DR"
24,"INDIAN DR"
12,"CHEROKEE TRAIL"
50,"CORONADO TRAIL"
'''
import wx, os
from cStringIO import StringIO
import csv

class MainFrame(wx.Frame):
    def __init__(self, parent, choices=[], style=0):
        wx.Frame.__init__(self,None,wx.ID_ANY,title='test combo autocomplete',size=(225, 70))

        self.vbox= wx.BoxSizer(wx.VERTICAL)
        self.background = wx.Panel(self)
        self.OpenDir = wx.TextCtrl(self,style=wx.PROCESS_ENTER|wx.TE_CENTRE)
        self.filter = wx.ComboBox(self, wx.ID_ANY, style=wx.CB_DROPDOWN)
        self.OpenDir.Bind(wx.EVT_LEFT_UP,self.OnChooseRoot)
        self.filter.Bind(wx.EVT_TEXT, self.OnTextChanged)

        hsizer1 = wx.BoxSizer(wx.HORIZONTAL)
        hsizer1.Add(self.OpenDir,1)        
        hsizer2 = wx.BoxSizer(wx.HORIZONTAL)
        hsizer2.Add(self.filter,1)

        self.vbox.Add(hsizer1,proportion = 0,flag = wx.EXPAND)
        self.vbox.Add(hsizer2,proportion = 0,flag = wx.EXPAND) 
        self.SetSizer(self.vbox)
        self.Show()
        self.OpenDir.SetValue("click to open directory")

    def OnTextChanged(self, event):
        def refresh():
            wnd = self.filter
            currentText = event.GetString()
            while wnd:
                print currentText
                wnd.Layout()
                print wnd.Layout()
                wnd = wnd.GetParent()
                self.filter.SetInsertionPoint(len(currentText))
                self.filter.SetMark(len(currentText), len(self.choices))
            self.filter.Refresh()
        refresh()
        event.Skip()

    def OnChooseRoot(self, event):
        self.dirname="" 
        dlg = wx.FileDialog(self, "choose a file to open", self.dirname,
                            "", "*.*", wx.OPEN) 
        if dlg.ShowModal() == wx.ID_OK:
            self.filename = dlg.GetFilename()
            self.dirname = dlg.GetDirectory()
            self.pathname = dlg.GetPath()
            self.f = open(os.path.join(self.dirname, self.filename), 'r')  
            self.text = self.f.read()
            labeltop = self.dirname + '\\'
            self.OpenDir.SetValue(labeltop + self.filename)

            sources = [StringIO(self.text)]
            for i, source in enumerate(sources):  
                c = list(csv.reader(source))                
                self.choices = [x[1] for x in c]
                self.filter.SetItems(self.choices)

app = wx.App(redirect=False)
frame = MainFrame(None)
app.MainLoop()