Qt quick start

This is the Qt spin box example included in AVC distribution. It comes into two versions. The first has the GUI generated from a Qt Designer UI description. The second has the GUI generated directly by program instructions. For full details see the "Qt examples" chapter of the user manual.

Source code: Designer version (file qt4_spinbox.py, needs also qt4_spinbox.ui)

01: #!/usr/bin/python
02: # .+
03: #
04: # .identifier : $Id:$
05: # .context    : Application View Controller
06: # .title      : A spin box replicated into a text label (Qt4)
07: # .kind       : python source
08: # .author     : Fabrizio Pollastri
09: # .site       : Revello - Italy
10: # .creation   : 7-Dec-2006
11: # .copyright  : (c) 2006 Fabrizio Pollastri.
12: # .license    : GNU General Public License (see below)
13: #
14: # This file is part of "AVC, Application View Controller".
15: #
16: # AVC is free software; you can redistribute it and/or modify
17: # it under the terms of the GNU General Public License as published by
18: # the Free Software Foundation; either version 3 of the License, or
19: # (at your option) any later version.
20: #
21: # AVC is distributed in the hope that it will be useful,
22: # but WITHOUT ANY WARRANTY; without even the implied warranty of
23: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24: # GNU General Public License for more details.
25: #
26: # You should have received a copy of the GNU General Public License
27: # along with this program.  If not, see <http://www.gnu.org/licenses/>.
28: #
29: # .-
30:
31:
32: from PyQt4.QtCore import *              # Qt core
33: from PyQt4.QtGui import *               # Qt GUI interface
34: from PyQt4.uic import *                 # ui files realizer
35: import sys                              # system support
36:
37: from avc import *                       # AVC
38:
39: UI_FILE = 'qt4_spinbox.ui'              # qt ui descriptor
40:
41:
42: class Example(QApplication,AVC):
43:   """
44:   A spin box whose value is replicated into a text label
45:   """
46:
47:   def __init__(self):
48:
49:     # create GUI
50:     QApplication.__init__(self,sys.argv)
51:     self.root = loadUi(UI_FILE)
52:     self.root.show()
53:
54:     # the variable holding the spin box value
55:     self.spin_value = 0
56:
57:
58: #### MAIN
59:
60: example = Example()                     # instantiate the application
61: example.avc_init()                      # connect widgets with variables
62: example.exec_()                         # run Qt event loop until quit
63:
64: #### END
65: 

Source code: programmatic version (file qt4_spinbox_progui.py)

01: #!/usr/bin/python
02: # .+
03: #
04: # .identifier : $Id:$
05: # .context    : Application View Controller
06: # .title      : A spin box replicated into a text label (Qt4)
07: # .kind       : python source
08: # .author     : Fabrizio Pollastri
09: # .site       : Torino - Italy
10: # .creation   : 10-Jan-2008
11: # .copyright  : (c) 2008 Fabrizio Pollastri.
12: # .license    : GNU General Public License (see below)
13: #
14: # This file is part of "AVC, Application View Controller".
15: #
16: # AVC is free software; you can redistribute it and/or modify
17: # it under the terms of the GNU General Public License as published by
18: # the Free Software Foundation; either version 3 of the License, or
19: # (at your option) any later version.
20: #
21: # AVC is distributed in the hope that it will be useful,
22: # but WITHOUT ANY WARRANTY; without even the implied warranty of
23: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24: # GNU General Public License for more details.
25: #
26: # You should have received a copy of the GNU General Public License
27: # along with this program.  If not, see <http://www.gnu.org/licenses/>.
28: #
29: # .-
30:
31:
32: from PyQt4.QtCore import *              # Qt core
33: from PyQt4.QtGui import *               # Qt GUI interface
34: import sys                              # system support
35:
36: from avc import *                       # AVC
37:
38:
39: class Example(QApplication,AVC):
40:   """
41:   A spin box whose value is replicated into a text label
42:   """
43:
44:   def __init__(self):
45:
46:     ## create GUI
47:
48:     QApplication.__init__(self,sys.argv)
49:
50:     # main window
51:     self.window = QWidget()
52:     self.window.setWindowTitle('AVC Qt4 spin box example')
53:     self.window.resize(280,70)
54:
55:     # horizontal layout for widgets inside main window
56:     self.hbox = QHBoxLayout()
57:     self.window.setLayout(self.hbox)
58:
59:     # label replicating the spin box value with formatting string
60:     self.label = QLabel()
61:     self.label.setObjectName('spin_value__label')
62:     self.label.setText('<b>%d</b>')
63:     self.hbox.addWidget(self.label)
64:
65:     # spin box
66:     self.spinbox = QSpinBox()
67:     self.spinbox.setRange(0,100)
68:     self.spinbox.setObjectName('spin_value__spinbox')
69:     self.hbox.addWidget(self.spinbox)
70:
71:     # show all widgets
72:     self.window.show()
73:
74:
75:     # the variable holding the spin box value
76:     self.spin_value = 0
77:
78:
79: #### MAIN
80:
81: example = Example()                     # instantiate the application
82: example.avc_init()                      # connect widgets with variables
83: example.exec_()                         # run Qt event loop until quit
84:
85: #### END
86: