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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/tutorial2-09.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/tutorial2-09.html')
| -rw-r--r-- | doc/html/tutorial2-09.html | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/doc/html/tutorial2-09.html b/doc/html/tutorial2-09.html new file mode 100644 index 0000000..5646d34 --- /dev/null +++ b/doc/html/tutorial2-09.html @@ -0,0 +1,249 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial2.doc:1233 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>Setting Options</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Setting Options</h1> + + +<p> +<p> <center><img src="chart-options.png" alt="The options dialog"></center> +<p> We provide an options dialog so that the user can set options that +apply to all data sets in one place. +<p> (Extracts from <tt>optionsform.h</tt>.) +<p> + +<pre> class OptionsForm : public <a href="qdialog.html">QDialog</a> + { + <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> + public: + OptionsForm( <a href="qwidget.html">QWidget</a>* parent = 0, const char* name = "options form", + bool modal = FALSE, WFlags f = 0 ); + ~OptionsForm() {} + + <a href="qfont.html">QFont</a> font() const { return m_font; } + void setFont( <a href="qfont.html">QFont</a> font ); + + <a href="qlabel.html">QLabel</a> *chartTypeTextLabel; + <a href="qcombobox.html">QComboBox</a> *chartTypeComboBox; + <a href="qpushbutton.html">QPushButton</a> *fontPushButton; + <a href="qlabel.html">QLabel</a> *fontTextLabel; + <a href="qframe.html">QFrame</a> *addValuesFrame; + <a href="qbuttongroup.html">QButtonGroup</a> *addValuesButtonGroup; + <a href="qradiobutton.html">QRadioButton</a> *noRadioButton; + <a href="qradiobutton.html">QRadioButton</a> *yesRadioButton; + <a href="qradiobutton.html">QRadioButton</a> *asPercentageRadioButton; + <a href="qlabel.html">QLabel</a> *decimalPlacesTextLabel; + <a href="qspinbox.html">QSpinBox</a> *decimalPlacesSpinBox; + <a href="qpushbutton.html">QPushButton</a> *okPushButton; + <a href="qpushbutton.html">QPushButton</a> *cancelPushButton; + + protected slots: + void chooseFont(); + + protected: + <a href="qvboxlayout.html">QVBoxLayout</a> *optionsFormLayout; + <a href="qhboxlayout.html">QHBoxLayout</a> *chartTypeLayout; + <a href="qhboxlayout.html">QHBoxLayout</a> *fontLayout; + <a href="qvboxlayout.html">QVBoxLayout</a> *addValuesFrameLayout; + <a href="qvboxlayout.html">QVBoxLayout</a> *addValuesButtonGroupLayout; + <a href="qhboxlayout.html">QHBoxLayout</a> *decimalPlacesLayout; + <a href="qhboxlayout.html">QHBoxLayout</a> *buttonsLayout; + + private: + <a href="qfont.html">QFont</a> m_font; + }; +</pre> +<p> The layout of this dialog is slightly more complicated than for the +set data form, but we only need a single slot. Unlike the "smart" set +data form this is a "dumb" dialog that simply provides the widgets for +the caller to set and read. The caller is responsible for updating +things based on the changes the user makes. +<p> (Extracts from <tt>optionsform.cpp</tt>.) +<p> + +<pre> #include "images/options_horizontalbarchart.xpm" + #include "images/options_piechart.xpm" + #include "images/options_verticalbarchart.xpm" +</pre> +<p> We include some some pixmaps to use in the chart type combobox. +<p> <h2> The Constructor +</h2> +<a name="1"></a><p> <pre> OptionsForm::OptionsForm( <a href="qwidget.html">QWidget</a>* parent, const char* name, + bool modal, WFlags f ) + : <a href="qdialog.html">QDialog</a>( parent, name, modal, f ) + { + <a href="qwidget.html#setCaption">setCaption</a>( "Chart -- Options" ); + <a href="qwidget.html#resize">resize</a>( 320, 290 ); +</pre> +<p> We pass all the arguments on to the <a href="qdialog.html">QDialog</a> constructor, set a caption +and set an initial size. +<p> The layout of the form will be to have the chart type label and combo +box in a horizontal box layout, and similarly for the font button and +font label, and for the decimal places label and spinbox. The +buttons will also be placed in a horizontal layout, but with a spacer +to move them to the right. The show values radio buttons will be +vertically aligned within a frame. All of these will be laid out in a +vertical box layout. +<p> <pre> optionsFormLayout = new <a href="qvboxlayout.html">QVBoxLayout</a>( this, 11, 6 ); +</pre> +<p> All the widgets will be laid out within the form's vertical box layout. +<p> <pre> chartTypeLayout = new <a href="qhboxlayout.html">QHBoxLayout</a>( 0, 0, 6 ); +</pre> +<p> The chart type label and combobox will be laid out side by side. +<p> <pre> chartTypeTextLabel = new <a href="qlabel.html">QLabel</a>( "&Chart Type", this ); + <a name="x2631"></a> chartTypeLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( chartTypeTextLabel ); + + chartTypeComboBox = new <a href="qcombobox.html">QComboBox</a>( FALSE, this ); + <a name="x2633"></a> chartTypeComboBox-><a href="qcombobox.html#insertItem">insertItem</a>( QPixmap( options_piechart ), "Pie Chart" ); + chartTypeComboBox-><a href="qcombobox.html#insertItem">insertItem</a>( QPixmap( options_verticalbarchart ), + "Vertical Bar Chart" ); + chartTypeComboBox-><a href="qcombobox.html#insertItem">insertItem</a>( QPixmap( options_horizontalbarchart ), + "Horizontal Bar Chart" ); + chartTypeLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( chartTypeComboBox ); + <a name="x2630"></a> optionsFormLayout-><a href="qboxlayout.html#addLayout">addLayout</a>( chartTypeLayout ); +</pre> +<p> We create the chart type label (with an accelerator which we'll relate +to the chart type combobox later). We also create a chart type +combobox, populating it with both pixmaps and text. We add them both +to the horizontal layout and add the horizontal layout to the form's +vertical layout. +<p> <pre> fontLayout = new <a href="qhboxlayout.html">QHBoxLayout</a>( 0, 0, 6 ); + + fontPushButton = new <a href="qpushbutton.html">QPushButton</a>( "&Font...", this ); + fontLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( fontPushButton ); + <a href="qspaceritem.html">QSpacerItem</a>* spacer = new <a href="qspaceritem.html">QSpacerItem</a>( 0, 0, + QSizePolicy::Expanding, + QSizePolicy::Minimum ); + <a name="x2629"></a> fontLayout-><a href="qboxlayout.html#addItem">addItem</a>( spacer ); + + fontTextLabel = new <a href="qlabel.html">QLabel</a>( this ); // Must be set by caller via setFont() + fontLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( fontTextLabel ); + optionsFormLayout-><a href="qboxlayout.html#addLayout">addLayout</a>( fontLayout ); +</pre> +<p> We create a horizontal box layout to hold the font button and font +label. The font button is straight-forward. We add a spacer to improve +the appearance. The font text label is initially empty (since we don't +know what font the user is using). +<p> <pre> addValuesFrame = new <a href="qframe.html">QFrame</a>( this ); + <a name="x2640"></a> addValuesFrame-><a href="qframe.html#setFrameShape">setFrameShape</a>( QFrame::StyledPanel ); + <a name="x2639"></a> addValuesFrame-><a href="qframe.html#setFrameShadow">setFrameShadow</a>( QFrame::Sunken ); + addValuesFrameLayout = new <a href="qvboxlayout.html">QVBoxLayout</a>( addValuesFrame, 11, 6 ); + + addValuesButtonGroup = new <a href="qbuttongroup.html">QButtonGroup</a>( "Show Values", addValuesFrame ); + <a name="x2641"></a> addValuesButtonGroup-><a href="qgroupbox.html#setColumnLayout">setColumnLayout</a>(0, Qt::Vertical ); + <a name="x2647"></a> addValuesButtonGroup-><a href="qwidget.html#layout">layout</a>()->setSpacing( 6 ); + addValuesButtonGroup-><a href="qwidget.html#layout">layout</a>()->setMargin( 11 ); + addValuesButtonGroupLayout = new <a href="qvboxlayout.html">QVBoxLayout</a>( + addValuesButtonGroup-><a href="qwidget.html#layout">layout</a>() ); + <a name="x2644"></a> addValuesButtonGroupLayout-><a href="qlayoutitem.html#setAlignment">setAlignment</a>( Qt::AlignTop ); + + noRadioButton = new <a href="qradiobutton.html">QRadioButton</a>( "&No", addValuesButtonGroup ); + <a name="x2645"></a> noRadioButton-><a href="qradiobutton.html#setChecked">setChecked</a>( TRUE ); + addValuesButtonGroupLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( noRadioButton ); + + yesRadioButton = new <a href="qradiobutton.html">QRadioButton</a>( "&Yes", addValuesButtonGroup ); + addValuesButtonGroupLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( yesRadioButton ); + + asPercentageRadioButton = new <a href="qradiobutton.html">QRadioButton</a>( "As &Percentage", + addValuesButtonGroup ); + addValuesButtonGroupLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( asPercentageRadioButton ); + addValuesFrameLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( addValuesButtonGroup ); +</pre> +<p> The user may opt to display their own labels as they are or to add the +values at the end of each label, either as-is or as percentages. +<p> We create a frame to present the radio buttons in and create a layout +for them. We create a button group (so that Qt will take care of +handling the exclusive radio button behaviour automatically). Next we +create the radio buttons, making "No" the default. +<p> The decimal places label and spin box are laid out just like the other +horizontal layouts, and the buttons are laid out in a very similar way +to the buttons in the set data form. +<p> <pre> <a href="qobject.html#connect">connect</a>( fontPushButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( chooseFont() ) ); + <a href="qobject.html#connect">connect</a>( okPushButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( <a href="qdialog.html#accept">accept</a>() ) ); + <a href="qobject.html#connect">connect</a>( cancelPushButton, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( <a href="qdialog.html#reject">reject</a>() ) ); +</pre> +<p> We only need three connections: +<ol type=1> +<li> When the user clicks the font button we execute our own +chooseFont() slot. +<li> If the user clicks OK we call <a href="qdialog.html#accept">QDialog::accept</a>(); it is up to the +caller to read the data from the dialog's widgets and perform any +necessary actions. +<li> If the user clicks Cancel we call <a href="qdialog.html#reject">QDialog::reject</a>(). +</ol> +<p> <pre> <a name="x2642"></a> chartTypeTextLabel-><a href="qlabel.html#setBuddy">setBuddy</a>( chartTypeComboBox ); + decimalPlacesTextLabel-><a href="qlabel.html#setBuddy">setBuddy</a>( decimalPlacesSpinBox ); +</pre> +<p> We use the setBuddy() function to associate widgets with label +accelerators. +<p> <h2> The Slots +</h2> +<a name="2"></a><p> <pre> void OptionsForm::chooseFont() + { + bool ok; + <a name="x2638"></a> <a href="qfont.html">QFont</a> font = QFontDialog::<a href="qfontdialog.html#getFont">getFont</a>( &ok, m_font, this ); + if ( ok ) + <a href="qwidget.html#setFont">setFont</a>( font ); + } +</pre> +<p> When the user clicks the Font button this slot is invoked. It simply +calls the static <a href="qfontdialog.html#getFont">QFontDialog::getFont</a>() function to obtain the user's +choice of font. If they chose a font we call our setFont() slot which +will present a textual description of the font in the font label. +<p> <pre> void OptionsForm::<a href="qwidget.html#setFont">setFont</a>( <a href="qfont.html">QFont</a> font ) + { + <a name="x2635"></a> <a href="qstring.html">QString</a> label = font.<a href="qfont.html#family">family</a>() + " " + + <a name="x2637"></a> QString::<a href="qstring.html#number">number</a>( font.<a href="qfont.html#pointSize">pointSize</a>() ) + "pt"; + <a name="x2634"></a> if ( font.<a href="qfont.html#bold">bold</a>() ) + label += " Bold"; + <a name="x2636"></a> if ( font.<a href="qfont.html#italic">italic</a>() ) + label += " Italic"; + fontTextLabel-><a href="qlabel.html#setText">setText</a>( label ); + m_font = font; + } +</pre> +<p> This function displays a textual description of the chosen font in the +font label and holds a copy of the font in the <tt>m_font</tt> member. We +need the font in a member so that we can provide a default font for +chooseFont(). +<p> <p align="right"> +<a href="tutorial2-08.html">« Taking Data</a> | +<a href="tutorial2.html">Contents</a> | +<a href="tutorial2-10.html">The Project File »</a> +</p> +<p> +<!-- eof --> +<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |