A Close Look at wxPython Controls - wxComboBox and wxListBox
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The wxComboBox and wxListBox controls are similar to wxChoice. The three controls share many methods. Let's take a quick look at the two controls and compare them with wxChoice:
from wxPython.wx import *
class OurFrame ( wxFrame ):
def __init__ ( self ):
wxFrame.__init__ ( self, None, -1, 'wxPython' )
self.panel = wxPanel ( self, -1 )
# Create the wxChoice control
self.choice = wxChoice ( self.panel, -1, choices = [ 'A', 'B', 'C', 'D' ] )
# Create the wxComboBox control
self.combo = wxComboBox ( self.panel, -1, '0', choices = [ '1', '2', '3', '4' ] )
# Create the wxListBox control
self.list = wxListBox ( self.panel, -1, choices = [ 'I', 'II', 'III', 'IV' ] )
# Append an option to each control
self.choice.Append ( 'E' )
self.combo.Append ( '5' )
self.list.Append ( 'V' )
# Delete an option from each control
self.choice.Delete ( 0 )
self.combo.Delete ( 0 )
self.list.Delete ( 0 )
# Replace choices
self.choice.SetString ( 1, 'X' )
self.combo.SetString ( 1, 'X' )
self.list.SetString ( 1, 'X' )
# Count items
self.choice.itemNum = self.choice.GetCount()
self.combo.itemNum = self.combo.GetCount()
self.list.itemNum = self.list.GetCount()
# Add a button
self.button = wxButton ( self.panel, 100, 'Click' )
EVT_BUTTON ( self.panel, 100, self.click )
self.sizer = wxBoxSizer ( wxVERTICAL )
self.sizer.Add ( self.choice, 0 )
self.sizer.Add ( self.combo, 0 )
self.sizer.Add ( self.list, 0 )
self.sizer.Add ( self.button, 0 )
self.panel.SetSizerAndFit ( self.sizer )
self.Show ( True )
def click ( self, event ):
# Display the position of all selections
print self.choice.GetSelection(), self.combo.GetSelection(), self.list.GetSelection()
# Display the selection
print self.choice.GetStringSelection(), self.combo.GetStringSelection(), self.list.GetStringSelection()
application = wxPySimpleApp()
window = OurFrame()
application.MainLoop()
The wxComboBox and wxListBox controls, however, do contain additional methods that you may use. First, we will tackle wxComboBox. As you know, wxComboBox provides the user with both a list and a text box. If you played around with the last example a bit, you probably saw that the GetStringSelection method will not return values that the user has typed in. Since GetSelection will return -1, however, it is easy to work around this:
from wxPython.wx import *
class OurFrame ( wxFrame ):
def __init__ ( self ):
wxFrame.__init__ ( self, None, -1, 'wxPython' )
self.panel = wxPanel ( self, -1 )
self.combo = wxComboBox ( self.panel, -1, choices = [ '1', '2', '3', '4' ] )
self.button = wxButton ( self.panel, 100, 'Click' )
EVT_BUTTON ( self.panel, 100, self.click )
self.sizer = wxBoxSizer ( wxVERTICAL )
self.sizer.Add ( self.combo, 0 )
self.sizer.Add ( self.button, 0 )
self.panel.SetSizerAndFit ( self.sizer )
self.Show ( True )
def click ( self, event ):
if self.combo.GetSelection() == -1:
self.combo.userValue = self.combo.GetValue()
else:
self.combo.userValue = self.combo.GetStringSelection()
print self.combo.userValue
application = wxPySimpleApp()
window = OurFrame()
application.MainLoop()
Next: wxListBox is versatile >>
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