[Pythoncard-users] Re: choice box - autofill

[Franz S. <fra...@gm...>]

On Thu, 4 May 2006 09:40:33 +0100, "Ray Allen" <ray...@sa...> wrote:

>Is there a way to configure choice boxes so they autofill using more than 
>the first letter?
>eg.  List of countries available from choice box.  If I want to select 
>'United Kingdom', have to click U five times (after passing a number of 
>other countries beginning with U) to get there.  I would like to type 'un' 
>and end up with countries beginning with 'un'.  Currently, this would result 
>in me seeing countries beginning in N!
>Thanks in advance,
>Ray Allen
>
>

I tried to implement this.
Here is the first prototype:

==================================================================
#!/usr/bin/env python
# TestChoiceAutoFind.py

#todo: make own ChoiceAutoFind class derived from Choice (also parent, pos, size, choices, styles, ...)

#todo: provide a better representation of the buffer. (A pop up or a tooltip beside the
#      right edge of the choice).

#todo: make option in constructor, wether to show buffer or not.

#todo: docstrings, comments

#todo: shold alt-cursor down (open the choice list) delete the buffer?


import  wx

class TestChoiceAutoFind(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent, -1)

        sampleList = ['zero', 'one', 'two', 'three', 'thirteen', 'twenty']

        wx.StaticText(self, -1, "Choice Auto Find", (15, 10))
        wx.StaticText(self, -1, "Select one:", (15, 50), (75, -1))
        self.ch = wx.Choice(self, -1, (100, 50), choices = sampleList)
        
        self.keybuffer = ""

        self.ch.Bind(wx.EVT_CHAR, self.EvtChar)
        self.ch.Bind(wx.EVT_SET_FOCUS, self.OnFocus)
        self.ch.Bind(wx.EVT_CHOICE, self.EvtChoice)
        
        
    def OnFocus(self, event):
        #delete buffer
        self.keybuffer = ""
        self.ShowBuffer()
        event.Skip()
        
    def EvtChar(self, event):
        if event.GetKeyCode() > 255:
            #example: cursor keys should work as expected
            event.Skip()
            return
        if event.GetKeyCode() == wx.WXK_BACK:
            #delete last key in buffer
            if len (self.keybuffer) > 0:
                self.keybuffer = self.keybuffer[:-1]
        elif event.GetKeyCode() == wx.WXK_ESCAPE:
            #delete buffer
            self.keybuffer = ""
        else:
            #extend buffer with current key
            self.keybuffer += chr (event.GetKeyCode())
        self.ShowBuffer()
        
        #try to find in the list
        for i in range(self.ch.GetCount()):
            if self.ch.GetString(i).find(self.keybuffer) == 0:
                self.ch.SetSelection(i)
                return
                
    def EvtChoice(self, event):
        print 'EvtChoice: %s\n' % event.GetString()
        
    def ShowBuffer(self):
        self.GetParent().SetStatusText("'"+self.keybuffer+"'",0)
        #show as tooltip beside combobox would be cool; or small popup window

app = wx.App(0)
f = wx.Frame(None)
f.CreateStatusBar()
p = TestChoiceAutoFind(f)
f.Show()
app.MainLoop()
==================================================================


I want to continue the discussion on the wxPython user mailing list.

-- 

Franz Steinhaeusler