author | Eckhart Koeppen <eckhart.koppen@nokia.com> |
Thu, 08 Apr 2010 14:19:33 +0300 | |
branch | RCL_3 |
changeset 7 | 3f74d0d4af4c |
permissions | -rw-r--r-- |
7
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/**************************************************************************** |
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** |
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (qt-info@nokia.com) |
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** |
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** This file is part of the documentation of the Qt Toolkit. |
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** |
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** $QT_BEGIN_LICENSE:LGPL$ |
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** No Commercial Usage |
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** This file contains pre-release code and may not be distributed. |
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** You may use this file in accordance with the terms and conditions |
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** contained in the Technology Preview License Agreement accompanying |
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** this package. |
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** |
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** GNU Lesser General Public License Usage |
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** Alternatively, this file may be used under the terms of the GNU Lesser |
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** General Public License version 2.1 as published by the Free Software |
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** Foundation and appearing in the file LICENSE.LGPL included in the |
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** packaging of this file. Please review the following information to |
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** ensure the GNU Lesser General Public License version 2.1 requirements |
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at qt-info@nokia.com. |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** $QT_END_LICENSE$ |
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** |
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****************************************************************************/ |
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|
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/*! |
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\example widgets/spinboxes |
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\title Spin Boxes Example |
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|
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The Spin Boxes example shows how to use the many different types of spin boxes |
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available in Qt, from a simple QSpinBox widget to more complex editors like |
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the QDateTimeEdit widget. |
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|
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\image spinboxes-example.png |
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|
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The example consists of a single \c Window class that is used to display the |
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different spin box-based widgets available with Qt. |
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|
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\section1 Window Class Definition |
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|
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The \c Window class inherits QWidget and contains two slots that are used |
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to provide interactive features: |
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|
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\snippet examples/widgets/spinboxes/window.h 0 |
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|
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The private functions are used to set up each type of spin box in the window. |
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We use member variables to keep track of various widgets so that they can |
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be reconfigured when required. |
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\section1 Window Class Implementation |
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|
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The constructor simply calls private functions to set up the different types |
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of spin box used in the example, and places each group in a layout: |
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\snippet examples/widgets/spinboxes/window.cpp 0 |
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We use the layout to manage the arrangement of the window's child widgets, |
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and change the window title. |
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The \c createSpinBoxes() function constructs a QGroupBox and places three |
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QSpinBox widgets inside it with descriptive labels to indicate the types of |
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input they expect. |
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\snippet examples/widgets/spinboxes/window.cpp 1 |
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The first spin box shows the simplest way to use QSpinBox. It accepts values |
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from -20 to 20, the current value can be increased or decreased by 1 with |
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either the arrow buttons or \key{Up} and \key{Down} keys, and the default |
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value is 0. |
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The second spin box uses a larger step size and displays a suffix to |
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provide more information about the type of data the number represents: |
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90 |
\snippet examples/widgets/spinboxes/window.cpp 2 |
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91 |
|
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92 |
This spin box also displays a |
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93 |
\l{QAbstractSpinBox::specialValueText}{special value} instead of the minimum |
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94 |
value defined for it. This means that it will never show \gui{0%}, but will |
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95 |
display \gui{Automatic} when the minimum value is selected. |
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96 |
|
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97 |
The third spin box shows how a prefix can be used: |
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98 |
|
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99 |
\snippet examples/widgets/spinboxes/window.cpp 4 |
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100 |
|
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101 |
For simplicity, we show a spin box with a prefix and no suffix. It is also |
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102 |
possible to use both at the same time. |
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103 |
|
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104 |
\snippet examples/widgets/spinboxes/window.cpp 5 |
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105 |
|
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106 |
The rest of the function sets up a layout for the group box and places each |
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107 |
of the widgets inside it. |
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108 |
|
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109 |
The \c createDateTimeEdits() function constructs another group box with a |
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110 |
selection of spin boxes used for editing dates and times. |
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111 |
|
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112 |
\snippet examples/widgets/spinboxes/window.cpp 6 |
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113 |
|
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114 |
The first spin box is a QDateEdit widget that is able to accept dates |
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115 |
within a given range specified using QDate values. The arrow buttons and |
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116 |
\key{Up} and \key{Down} keys can be used to increase and decrease the |
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117 |
values for year, month, and day when the cursor is in the relevant section. |
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118 |
|
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119 |
The second spin box is a QTimeEdit widget: |
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120 |
|
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121 |
\snippet examples/widgets/spinboxes/window.cpp 7 |
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122 |
|
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123 |
Acceptable values for the time are defined using QTime values. |
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124 |
|
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125 |
The third spin box is a QDateTimeEdit widget that can display both date and |
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126 |
time values, and we place a label above it to indicate the range of allowed |
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127 |
times for a meeting. These widgets will be updated when the user changes a |
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128 |
format string. |
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129 |
|
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130 |
\snippet examples/widgets/spinboxes/window.cpp 8 |
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131 |
|
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132 |
The format string used for the date time editor, which is also shown in the |
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133 |
string displayed by the label, is chosen from a set of strings in a combobox: |
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134 |
|
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135 |
\snippet examples/widgets/spinboxes/window.cpp 9 |
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136 |
\codeline |
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137 |
\snippet examples/widgets/spinboxes/window.cpp 10 |
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138 |
|
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139 |
A signal from this combobox is connected to a slot in the \c Window class |
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140 |
(shown later). |
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141 |
|
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142 |
\snippet examples/widgets/spinboxes/window.cpp 11 |
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143 |
|
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144 |
Each child widget of the group box in placed in a layout. |
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145 |
|
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146 |
The \c setFormatString() slot is called whenever the user selects a new |
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147 |
format string in the combobox. The display format for the QDateTimeEdit |
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148 |
widget is set using the raw string passed by the signal: |
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149 |
|
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150 |
\snippet examples/widgets/spinboxes/window.cpp 12 |
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151 |
|
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152 |
Depending on the visible sections in the widget, we set a new date or time |
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153 |
range, and update the associated label to provide relevant information for |
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154 |
the user: |
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155 |
|
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156 |
\snippet examples/widgets/spinboxes/window.cpp 13 |
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157 |
|
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158 |
When the format string is changed, there will be an appropriate label and |
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159 |
entry widget for dates, times, or both types of input. |
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160 |
|
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161 |
The \c createDoubleSpinBoxes() function constructs three spin boxes that are |
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162 |
used to input double-precision floating point numbers: |
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163 |
|
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164 |
\snippet examples/widgets/spinboxes/window.cpp 14 |
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165 |
|
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166 |
Before the QDoubleSpinBox widgets are constructed, we create a spin box to |
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167 |
control how many decimal places they show. By default, only two decimal places |
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168 |
are shown in the following spin boxes, each of which is the equivalent of a |
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169 |
spin box in the group created by the \c createSpinBoxes() function. |
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170 |
|
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171 |
The first double spin box shows a basic double-precision spin box with the |
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172 |
same range, step size, and default value as the first spin box in the |
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173 |
\c createSpinBoxes() function: |
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174 |
|
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175 |
\snippet examples/widgets/spinboxes/window.cpp 15 |
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176 |
|
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177 |
However, this spin box also allows non-integer values to be entered. |
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178 |
|
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The second spin box displays a suffix and shows a special value instead |
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of the minimum value: |
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\snippet examples/widgets/spinboxes/window.cpp 16 |
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The third spin box displays a prefix instead of a suffix: |
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\snippet examples/widgets/spinboxes/window.cpp 17 |
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|
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We connect the QSpinBox widget that specifies the precision to a slot in |
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the \c Window class. |
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\snippet examples/widgets/spinboxes/window.cpp 18 |
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The rest of the function places each of the widgets into a layout for the |
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group box. |
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|
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The \c changePrecision() slot is called when the user changes the value in |
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the precision spin box: |
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\snippet examples/widgets/spinboxes/window.cpp 19 |
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|
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This function simply uses the integer supplied by the signal to specify the |
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number of decimal places in each of the QDoubleSpinBox widgets. Each one |
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of these will be updated automatically when their |
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\l{QDoubleSpinBox::decimals}{decimals} property is changed. |
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*/ |