| 1 | title = 'More examples of subclassing' |
| 2 | |
| 3 | # Import Pmw from this directory tree. |
| 4 | import sys |
| 5 | sys.path[:0] = ['../../..'] |
| 6 | |
| 7 | import Tkinter |
| 8 | import Pmw |
| 9 | |
| 10 | class ExtraMethods(Pmw.EntryField): |
| 11 | |
| 12 | # How to subclass a Pmw megawidget when you only want to add or |
| 13 | # override methods. |
| 14 | |
| 15 | def doubletext(self): |
| 16 | self.setvalue(self.getvalue() + ' ' + self.getvalue()) |
| 17 | |
| 18 | class OverrideInit(Pmw.EntryField): |
| 19 | |
| 20 | # How to subclass a Pmw megawidget when you want to define |
| 21 | # a new __init__ method. |
| 22 | |
| 23 | def __init__(self, textToAdd, parent = None, **kw): |
| 24 | self._textToAdd = textToAdd |
| 25 | apply(Pmw.EntryField.__init__, (self, parent), kw) |
| 26 | |
| 27 | def addtext(self): |
| 28 | self.setvalue(self.getvalue() + ' ' + self._textToAdd) |
| 29 | |
| 30 | class DefaultOptions(Pmw.EntryField): |
| 31 | |
| 32 | # How to subclass a Pmw megawidget when you only want to set |
| 33 | # existing options to new default values. |
| 34 | |
| 35 | def __init__(self, parent = None, **kw): |
| 36 | kw['label_foreground'] = 'blue' |
| 37 | kw['entry_background'] = 'white' |
| 38 | apply(Pmw.EntryField.__init__, (self, parent), kw) |
| 39 | |
| 40 | class NewOptions(Pmw.EntryField): |
| 41 | |
| 42 | # How to subclass a Pmw megawidget when you want to add new options. |
| 43 | |
| 44 | def __init__(self, parent=None , **kw): |
| 45 | |
| 46 | # Define the megawidget options. |
| 47 | optiondefs = ( |
| 48 | ('backgrounds', None, self._backgrounds), |
| 49 | ) |
| 50 | self.defineoptions(kw, optiondefs) |
| 51 | |
| 52 | # Initialise the base class (after defining the options). |
| 53 | Pmw.EntryField.__init__(self, parent) |
| 54 | |
| 55 | # Check keywords and initialise options. |
| 56 | self.initialiseoptions() |
| 57 | |
| 58 | def _backgrounds(self): |
| 59 | background = self['backgrounds'] |
| 60 | Pmw.Color.changecolor(self.component('hull'), background) |
| 61 | |
| 62 | class Demo: |
| 63 | def __init__(self, parent): |
| 64 | # Create and pack the megawidgets. |
| 65 | self._extraMethod = ExtraMethods(parent, |
| 66 | labelpos = 'w', |
| 67 | label_text = 'Sub class with extra method:', |
| 68 | value = 'Hello' |
| 69 | ) |
| 70 | self._overrideInit = OverrideInit('Again', parent, |
| 71 | labelpos = 'w', |
| 72 | label_text = 'Sub class with new __init__ method:', |
| 73 | value = 'Hello' |
| 74 | ) |
| 75 | self._defaultOptions = DefaultOptions(parent, |
| 76 | labelpos = 'w', |
| 77 | label_text = 'Sub class with new default options:', |
| 78 | value = 'Hello' |
| 79 | ) |
| 80 | |
| 81 | self._newOptions = NewOptions(parent, |
| 82 | labelpos = 'w', |
| 83 | label_text = 'Sub class with new option:', |
| 84 | value = 'Hello', |
| 85 | backgrounds = 'white', |
| 86 | ) |
| 87 | |
| 88 | entries = (self._extraMethod, self._overrideInit, |
| 89 | self._defaultOptions, self._newOptions) |
| 90 | |
| 91 | for entry in entries: |
| 92 | entry.pack(fill='x', expand=1, padx=10, pady=5) |
| 93 | Pmw.alignlabels(entries) |
| 94 | |
| 95 | bb = Pmw.ButtonBox(parent) |
| 96 | bb.add('Double text', command = self._doubleText) |
| 97 | bb.pack() |
| 98 | bb.add('Add text', command = self._addText) |
| 99 | bb.pack() |
| 100 | bb.add('White', command = self._changeColorWhite) |
| 101 | bb.pack() |
| 102 | bb.add('Green', command = self._changeColorGreen) |
| 103 | bb.pack() |
| 104 | |
| 105 | def _doubleText(self): |
| 106 | self._extraMethod.doubletext() |
| 107 | |
| 108 | def _addText(self): |
| 109 | self._overrideInit.addtext() |
| 110 | |
| 111 | def _changeColorWhite(self): |
| 112 | self._newOptions.configure(backgrounds = 'white') |
| 113 | |
| 114 | def _changeColorGreen(self): |
| 115 | self._newOptions.configure(backgrounds = 'green') |
| 116 | |
| 117 | ###################################################################### |
| 118 | |
| 119 | # Create demo in root window for testing. |
| 120 | if __name__ == '__main__': |
| 121 | root = Tkinter.Tk() |
| 122 | Pmw.initialise(root) |
| 123 | root.title(title) |
| 124 | |
| 125 | exitButton = Tkinter.Button(root, text = 'Exit', command = root.destroy) |
| 126 | exitButton.pack(side = 'bottom') |
| 127 | widget = Demo(root) |
| 128 | root.mainloop() |