Creating a Collection of Controls
This recipe shows how to create an aligned column of buttons on a panel by creating the buttons as instances of a nested class.
1 from wxPython.wx import *
2
3 class ButtonColumn ( wxPanel ):
4 '''Create aligned column of equal-sized buttons with distinct labels and OnClick destinations.
5
6 Illustrates use of nested classes for creating a collection of controls.
7 '''
8 class aButton ( wxButton ):
9 '''Nested button class for use by ButtonColumn class.'''
10 def __init__ ( self, parent, label, whotocall ):
11 """Expects reference to 'ButtonColumn', list of labels for buttons and list of functions to be called for OnClick events"""
12 id = wxNewId ( )
13 wxButton.__init__ ( self, parent, id, label, wxDefaultPosition, wxDefaultSize, 1 )
14 self.whotocall = whotocall
15 EVT_BUTTON ( self, id, self.OnClick )
16
17 def OnClick ( self, event ):
18 if self.whotocall: self.whotocall ( )
19
20 def __init__ ( self, parent, width, buttons, Bottom = 0 ):
21 """Expects reference to 'parent' of 'ButtonColumn', button column 'width', list of button descriptor tuples, and number of buttons to be displayed at the bottom of the column.
22
23 Each button descriptor consists of a label for the button and a reference to the function to be called when the button is clicked.
24 """
25 wxPanel.__init__ ( self, parent, -1, wxDefaultPosition, ( 100, 200 ) )
26 self.parent = parent
27
28 """Create the upper collection of buttons"""
29 previous = None
30 for button in buttons [ 0 : len ( buttons ) -Bottom ]:
31 oneButton = self.aButton ( self, button [ 0 ], button [ 1 ] )
32 lc = wxLayoutConstraints ( )
33 lc.left.SameAs ( self, wxLeft, 5 )
34 lc.right.SameAs ( self, wxRight, 5 )
35 lc.height.AsIs ( )
36 if previous: lc.top.SameAs ( previous, wxBottom, 5 )
37 else: lc.top.SameAs ( self, wxTop, 5 )
38 oneButton.SetConstraints ( lc )
39 previous = oneButton
40
41 """Create the lower collection of buttons"""
42 buttons.reverse ( )
43 previous = None
44 for button in buttons [ 0 : Bottom ]:
45 oneButton = self.aButton ( self, button [ 0 ], button [ 1 ] )
46 lc = wxLayoutConstraints ( )
47 lc.left.SameAs ( self, wxLeft, 5 )
48 lc.right.SameAs ( self, wxRight, 5 )
49 lc.height.AsIs ( )
50 if previous: lc.bottom.SameAs ( previous, wxTop, 5 )
51 else: lc.bottom.SameAs ( self, wxBottom, 5 )
52 oneButton.SetConstraints ( lc )
53 previous = oneButton
54
55 if __name__ == '__main__':
56 class TestFrame(wxFrame):
57 def __init__(self):
58 wxFrame.__init__ (
59 self, None, -1, "Button Column Test",
60 size = ( 450, 300 ),
61 style = wxDEFAULT_FRAME_STYLE | wxNO_FULL_REPAINT_ON_RESIZE
62 )
63 self.SetAutoLayout ( true )
64 buttons = [
65 ( 'OK', self.OKClicked, ),
66 ( 'Cancel', self.CancelClicked, ),
67 ( 'Re-invert', self.ReinvertClicked, ),
68 ( 'Exit', self.ExitClicked, ),
69 ]
70
71 self.tp = ButtonColumn ( self, 45, buttons, 2 )
72
73 lc = wxLayoutConstraints ( )
74 lc.right.SameAs ( self, wxRight)
75 lc.width.AsIs ( )
76 lc.top.SameAs ( self, wxTop )
77 lc.bottom.SameAs ( self, wxBottom )
78 self.tp.SetConstraints ( lc )
79
80 self.CreateStatusBar ( )
81
82 def OKClicked ( self ):
83 print "OKClicked"
84
85 def CancelClicked ( self ):
86 print "CancelClicked"
87
88 def ReinvertClicked ( self ):
89 print "ReInvertClicked"
90
91 def ExitClicked ( self ):
92 self.Close ( )
93
94 app = wxPySimpleApp()
95 frame = TestFrame()
96 frame.Show(true)
97 app.MainLoop()
Comments to Bill Bell
Another Way
This is a Scheme-ish method of making collections of controls. It's nice because it's easy to rearrange structure:
Full code follows. I suspect it can be made even tighter.
-- LionKimbro
1 from wxPython.wx import *
2
3 def new_sizer( form, lst, sizer, orientation ):
4 "Called by *vbox* and *hbox* with orientation:(wxVERTICAL or wxHORIZONTAL)"
5 new_sizer = wxBoxSizer( orientation )
6 for item in lst[1:]:
7 item[0]( form, item, new_sizer )
8 sizer.Add( new_sizer, 1, wxGROW )
9 def vbox( form, lst, sizer ):
10 new_sizer( form, lst, sizer, wxVERTICAL )
11 def hbox( form, lst, sizer ):
12 new_sizer( form, lst, sizer, wxHORIZONTAL )
13 def spacer( form, lst, sizer ):
14 "grows can be 1 or 0"
15 (cmd, wide,high, grows)=lst
16
17 sizer.Add( wide,high, grows )
18
19 def button( form, lst, sizer ):
20 (cmd, label,method)=lst
21
22 id=wxNewId()
23 sizer.Add( wxButton( form, id, label, style=wxBU_EXACTFIT ), 0, wxGROW )
24 EVT_BUTTON( form, id, method )
25
26
27 class TestFrame(wxFrame):
28 def __init__(self):
29 wxFrame.__init__(
30 self, None, -1, "Button Column Test",
31 size = ( 450, 300 ),
32 style = wxDEFAULT_FRAME_STYLE | wxNO_FULL_REPAINT_ON_RESIZE )
33
34 spec=[hbox,
35 [spacer, 350,200, 0],
36 [vbox,
37 [button, "OK", self.OKClicked],
38 [button, "Cancel", self.CancelClicked],
39 [spacer, 10,100, 1],
40 [button, "Re-invert", self.ReinvertClicked],
41 [button, "Exit", self.ExitClicked]]]
42
43 master_sizer=wxBoxSizer( wxVERTICAL )
44 spec[0]( self, spec, master_sizer ) # build from spec
45 self.SetSizer( master_sizer )
46 self.SetAutoLayout( 1 )
47
48 self.CreateStatusBar ( )
49
50 def OKClicked ( self, evt ):
51 print "OKClicked"
52 def CancelClicked ( self, evt ):
53 print "CancelClicked"
54 def ReinvertClicked ( self, evt ):
55 print "ReInvertClicked"
56 def ExitClicked ( self, evt ):
57 self.Close()
58
59 app = wxPySimpleApp()
60 frame = TestFrame()
61 frame.Show(1)
62 app.MainLoop()