wxPython控件學習之wx.ComboBox

 wx.Combobox由一個編輯框和列表組成。它可以顯示為帶有可編輯或只讀文本框的靜態列表，也可以顯示為帶下拉列表的文本區域，或者是不帶文本框的下拉列表。一個wx.Combobox只允許單選。wx.Combobox的選擇項從0開始編號。如果你需要定制wx.Combobox，可以參照wx.ComboCtrl，wx.OwnerDrawnComboBox，wx.ComboPopup和即將可用的wx.BitmapComBox等控件。

1. Style 樣式

wx.CB_SIMPLE  創建一個帶列表顯示的combobox.只支持windows

wx.CB_DROPDOWN 創建一個帶下拉列表的combobox

wx.CB_READONLY 同wx.CB_DROPDOWN，但只有被當做combobox選擇項的字符串才能被選定，不在選擇列表中的字符串無法將無法填入控件中的文本框。

wx.CB_SORT 列表項按字母序排序

wx.TE_PROCES_ENTER 此樣式下控件會產生事件wx.EVT_COMMAND_TEXT_ENTER（否則按下Enter鍵要么被控件內部處理，要么被用於控件導航）。僅支持windows。

2. 事件

EVT_COMBOBOX(id,func) //當列表中的一個項被選擇時，處理wx.EVT_COMMAND_COMBOBOX_SELECTED事件。注意到調用GetValue返回的是選擇后的值。

EVT_TEXT(id,func) //當combobox文本改變時，處理wx.EVT_COMMAND_TEXT_UPDATED事件

EVT_TEXT_ENTER(id,func) //當在combobox中按下回車鍵時，處理wx.EVT_TEXT_ENTER事件。

 

 

# -*- coding: UTF-8 -*-

#-------------------------------------------------------------------------------
# Name:        模塊1
# Purpose:
#
# Author:      ankier
#
# Created:     10/10/2012
# Copyright:   (c) ankier 2012
# Licence:     <your licence>
#-------------------------------------------------------------------------------

import wx

class ComboBoxFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, -1, 'Combo Box Example', size=(350, 300))
        panel = wx.Panel(self, -1)
        sampleList = ['zero', 'one', 'two', 'three', 'four', 'five','six', 'seven', 'eight']

        flexSizer = wx.FlexGridSizer(4,4,6,6)
        flexSizer.AddGrowableCol(1)
        flexSizer.AddGrowableCol(3)

        #定義普通樣式的comboBox, 接受鍵盤輸入，但不會改變Item
        commonLable = wx.StaticText(panel, -1, "普通樣式")
        commonComboBox = wx.ComboBox(panel, -1, value = "zero", choices = sampleList, style = wx.CB_DROPDOWN)

        #定義簡單樣式的ComboBox，
        simpleLable = wx.StaticText(panel, -1, "簡單樣式:")
        simpleComboBox = wx.ComboBox(panel, -1, value =  "zero", choices = sampleList, style = wx.CB_SIMPLE)

        #定義只讀樣式的ComboBox，
        readonlyLable = wx.StaticText(panel, -1, "只讀樣式:")
        readonlyComboBox = wx.ComboBox(panel, -1, value =  "zero", choices = sampleList, style = wx.CB_READONLY)

        #定義二級聯動下拉列表
        cityDict = {'安徽':["合肥", "淮南"], "江蘇":["蘇州","南京"]}

        #定義第一級菜單
        proviceLable = wx.StaticText(panel, -1, "省份:")
        proviceComboBox = wx.ComboBox(panel, -1, value =  cityDict.keys()[0], choices = cityDict.keys(), style = wx.CB_READONLY)
        #定義第二級菜單
        cityLable = wx.StaticText(panel, -1, "城市:")
        cityComboBox = wx.ComboBox(panel, -1, value =  cityDict[cityDict.keys()[0]][0], choices = cityDict[cityDict.keys()[0]], style = wx.CB_READONLY)

        flexSizer.AddMany([
                            (commonLable, 0, wx.SHAPED|wx.ALIGN_RIGHT), (commonComboBox, 1, wx.EXPAND), (simpleLable, 0, wx.SHAPED|wx.ALIGN_RIGHT),(simpleComboBox, 1, wx.EXPAND)
                            ,(readonlyLable, 0, wx.SHAPED|wx.ALIGN_RIGHT), (readonlyComboBox, 1, wx.EXPAND),(wx.Size(6,6), 0, wx.SHAPED|wx.ALIGN_RIGHT), (wx.Size(6,6), 1, wx.EXPAND)
                            ,(proviceLable, 0, wx.SHAPED|wx.ALIGN_RIGHT), (proviceComboBox, 1, wx.EXPAND),(wx.Size(6,6), 0, wx.SHAPED|wx.ALIGN_RIGHT), (wx.Size(6,6), 1, wx.EXPAND)
                            ,(cityLable, 0, wx.SHAPED|wx.ALIGN_RIGHT), (cityComboBox, 1, wx.EXPAND),(wx.Size(6,6), 0, wx.SHAPED|wx.ALIGN_RIGHT), (wx.Size(6,6), 1, wx.EXPAND)
                            ])

        panel.SetSizerAndFit(flexSizer)


        #定義 一級下拉列表切換時，刷新二級菜單項的響應事件
        self.__ProvinceComboBox = proviceComboBox
        self.__SecityDict = cityDict
        self.__CityComboBox= cityComboBox
        panel.Bind(wx.EVT_COMBOBOX,  self.__OnComboBoxSelected, proviceComboBox,)

    def __OnComboBoxSelected(self, event):
        currentProvinceIndex = self.__ProvinceComboBox.GetSelection()
        if wx.NOT_FOUND == currentProvinceIndex: return
        value = self.__ProvinceComboBox.GetItems()[currentProvinceIndex]
        
        #注意中文在List dict 等存儲時候, utf-8 格式不一致問題
        value = value.encode('utf-8')
        
        cityList = self.__SecityDict[value]
        self.__CityComboBox.SetItems(cityList)
        self.__CityComboBox.SetValue(cityList[0])




def main():
    app = wx.PySimpleApp()
    ComboBoxFrame().Show()
    app.MainLoop()


if __name__ == '__main__':
    main()