1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example designer/worldtimeclockbuilder
\title World Time Clock Builder Example
The World Time Clock Builder example shows how forms created with Qt
Designer that contain custom widgets can be dynamically generated at
run-time.
\image worldtimeclockbuilder-example.png
This example uses a form containing the custom widget plugin described in the
\l{designer/worldtimeclockplugin}{World Time Clock Plugin} example, and
dynamically generates a user interface using the QUiLoader class, part of
the QtUiTools module.
\section1 Preparation
As with the \l{designer/calculatorbuilder}{Calculator Builder} example, the
project file for this example needs to include the appropriate definitions
to ensure that it is built against the required Qt modules.
\snippet examples/designer/worldtimeclockbuilder/worldtimeclockbuilder.pro 0
By appending \c form to the \c CONFIG declaration, we instruct \c qmake to
generate a dependency on the \c libQtUiTools library containing the QtUiTools
classes.
Note that we do not inform \c qmake about any UI files, and so none will
be processed and built into the application. The resource file contains
an entry for the particular form that we wish to use:
\quotefile examples/designer/worldtimeclockbuilder/worldtimeclockbuilder.qrc
Forms do not need to be included with the application in this way. We only
include a form in the application's resources for convenience, and to keep
the example short.
\section1 Loading and Building the Form
Since this example only loads and displays a pre-prepared form, all of the
work can be done in the main() function. We are using a class from the
QtUiTools library so, in addition to any other Qt classes that are normally
required to write an application, we must include the appropriate header
file:
\snippet examples/designer/worldtimeclockbuilder/main.cpp 0
The main function initializes the resource system with the Q_INIT_RESOURCE()
macro and constructs an QApplication instance in the usual way:
\snippet examples/designer/worldtimeclockbuilder/main.cpp 1
We construct a QUiLoader object to handle the form we want to use.
The form itself is obtained from the resource file system using the path
defined in the resource file. We use the form loader to load and construct
the form:
\snippet examples/designer/worldtimeclockbuilder/main.cpp 2
Once the form has been loaded, the resource file can be closed and the
widget is shown.
\snippet examples/designer/worldtimeclockbuilder/main.cpp 3
The form loader ensures that all the signal and slot connections between
objects in the form are set up correctly when the form is loaded. As a
result, the time is updated by the World Time Clock widget, and the time
zone spin box can be used to change the position of the hour hand.
*/
|
