1 # -*-mode: python; fill-column: 75; tab-width: 8; coding: iso-latin-1-unix -*- 2 # 3 # $Id$ 4 # 5 # Tix Demonstration Program 6 # 7 # This sample program is structured in such a way so that it can be 8 # executed from the Tix demo program "tixwidgets.py": it must have a 9 # procedure called "RunSample". It should also have the "if" statment 10 # at the end of this file so that it can be run as a standalone 11 # program. 12 13 # This file demonstrates the use of the tixControl widget -- it is an 14 # entry widget with up/down arrow buttons. You can use the arrow buttons 15 # to adjust the value inside the entry widget. 16 # 17 # This example program uses three Control widgets. One lets you select 18 # integer values; one lets you select floating point values and the last 19 # one lets you select a few names. 20 21 import Tix 22 23 TCL_ALL_EVENTS = 0 24 25 def RunSample (root): 26 control = DemoControl(root) 27 control.mainloop() 28 control.destroy() 29 30 class DemoControl: 31 def __init__(self, w): 32 self.root = w 33 self.exit = -1 34 35 global demo_maker, demo_thrust, demo_num_engines 36 37 demo_maker = Tix.StringVar() 38 demo_thrust = Tix.DoubleVar() 39 demo_num_engines = Tix.IntVar() 40 demo_maker.set('P&W') 41 demo_thrust.set(20000.0) 42 demo_num_engines.set(2) 43 44 top = Tix.Frame(w, bd=1, relief=Tix.RAISED) 45 46 # $w.top.a allows only integer values 47 # 48 # [Hint] The -options switch sets the options of the subwidgets. 49 # [Hint] We set the label.width subwidget option of the Controls to 50 # be 16 so that their labels appear to be aligned. 51 # 52 a = Tix.Control(top, label='Number of Engines: ', integer=1, 53 variable=demo_num_engines, min=1, max=4, 54 options='entry.width 10 label.width 20 label.anchor e') 55 56 b = Tix.Control(top, label='Thrust: ', integer=0, 57 min='10000.0', max='60000.0', step=500, 58 variable=demo_thrust, 59 options='entry.width 10 label.width 20 label.anchor e') 60 61 c = Tix.Control(top, label='Engine Maker: ', value='P&W', 62 variable=demo_maker, 63 options='entry.width 10 label.width 20 label.anchor e') 64 65 # We can't define these in the init because the widget 'c' doesn't 66 # exist yet and we need to reference it 67 c['incrcmd'] = lambda w=c: adjust_maker(w, 1) 68 c['decrcmd'] = lambda w=c: adjust_maker(w, -1) 69 c['validatecmd'] = lambda w=c: validate_maker(w) 70 71 a.pack(side=Tix.TOP, anchor=Tix.W) 72 b.pack(side=Tix.TOP, anchor=Tix.W) 73 c.pack(side=Tix.TOP, anchor=Tix.W) 74 75 box = Tix.ButtonBox(w, orientation=Tix.HORIZONTAL) 76 box.add('ok', text='Ok', underline=0, width=6, 77 command=self.okcmd) 78 box.add('cancel', text='Cancel', underline=0, width=6, 79 command=self.quitcmd) 80 box.pack(side=Tix.BOTTOM, fill=Tix.X) 81 top.pack(side=Tix.TOP, fill=Tix.BOTH, expand=1) 82 83 def okcmd (self): 84 # tixDemo:Status "Selected %d of %s engines each of thrust %d", (demo_num_engines.get(), demo_maker.get(), demo_thrust.get()) 85 self.quitcmd() 86 87 def quitcmd (self): 88 self.exit = 0 89 90 def mainloop(self): 91 while self.exit < 0: 92 self.root.tk.dooneevent(TCL_ALL_EVENTS) 93 94 def destroy (self): 95 self.root.destroy() 96 97 maker_list = ['P&W', 'GE', 'Rolls Royce'] 98 99 def adjust_maker(w, inc): 100 i = maker_list.index(demo_maker.get()) 101 i = i + inc 102 if i >= len(maker_list): 103 i = 0 104 elif i < 0: 105 i = len(maker_list) - 1 106 107 # In Tcl/Tix we should return the string maker_list[i]. We can't 108 # do that in Tkinter so we set the global variable. (This works). 109 demo_maker.set(maker_list[i]) 110 111 def validate_maker(w): 112 try: 113 i = maker_list.index(demo_maker.get()) 114 except ValueError: 115 # Works here though. Why ? Beats me. 116 return maker_list[0] 117 # Works here though. Why ? Beats me. 118 return maker_list[i] 119 120 if __name__ == '__main__': 121 root = Tix.Tk() 122 RunSample(root) 123
