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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/doc/tutorial2.doc:1233 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Setting Options</title>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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<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>
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<p>
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<p> <center><img src="chart-options.png" alt="The options dialog"></center>
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<p> We provide an options dialog so that the user can set options that
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apply to all data sets in one place.
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<p> (Extracts from <tt>optionsform.h</tt>.)
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<p>
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<pre> class OptionsForm : public <a href="ntqdialog.html">TQDialog</a>
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{
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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public:
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OptionsForm( <a href="tqwidget.html">TQWidget</a>* parent = 0, const char* name = "options form",
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bool modal = FALSE, WFlags f = 0 );
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~OptionsForm() {}
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<a href="tqfont.html">TQFont</a> font() const { return m_font; }
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void setFont( <a href="tqfont.html">TQFont</a> font );
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<a href="ntqlabel.html">TQLabel</a> *chartTypeTextLabel;
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<a href="ntqcombobox.html">TQComboBox</a> *chartTypeComboBox;
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<a href="ntqpushbutton.html">TQPushButton</a> *fontPushButton;
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<a href="ntqlabel.html">TQLabel</a> *fontTextLabel;
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<a href="ntqframe.html">TQFrame</a> *addValuesFrame;
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<a href="ntqbuttongroup.html">TQButtonGroup</a> *addValuesButtonGroup;
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<a href="ntqradiobutton.html">TQRadioButton</a> *noRadioButton;
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<a href="ntqradiobutton.html">TQRadioButton</a> *yesRadioButton;
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<a href="ntqradiobutton.html">TQRadioButton</a> *asPercentageRadioButton;
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<a href="ntqlabel.html">TQLabel</a> *decimalPlacesTextLabel;
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<a href="ntqspinbox.html">TQSpinBox</a> *decimalPlacesSpinBox;
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<a href="ntqpushbutton.html">TQPushButton</a> *okPushButton;
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<a href="ntqpushbutton.html">TQPushButton</a> *cancelPushButton;
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protected slots:
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void chooseFont();
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protected:
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<a href="qvboxlayout.html">TQVBoxLayout</a> *optionsFormLayout;
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<a href="qhboxlayout.html">TQHBoxLayout</a> *chartTypeLayout;
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<a href="qhboxlayout.html">TQHBoxLayout</a> *fontLayout;
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<a href="qvboxlayout.html">TQVBoxLayout</a> *addValuesFrameLayout;
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<a href="qvboxlayout.html">TQVBoxLayout</a> *addValuesButtonGroupLayout;
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<a href="qhboxlayout.html">TQHBoxLayout</a> *decimalPlacesLayout;
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<a href="qhboxlayout.html">TQHBoxLayout</a> *buttonsLayout;
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private:
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<a href="tqfont.html">TQFont</a> m_font;
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};
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</pre>
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<p> The layout of this dialog is slightly more complicated than for the
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set data form, but we only need a single slot. Unlike the "smart" set
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data form this is a "dumb" dialog that simply provides the widgets for
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the caller to set and read. The caller is responsible for updating
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things based on the changes the user makes.
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<p> (Extracts from <tt>optionsform.cpp</tt>.)
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<p>
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<pre> #include "images/options_horizontalbarchart.xpm"
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#include "images/options_piechart.xpm"
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#include "images/options_verticalbarchart.xpm"
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</pre>
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<p> We include some some pixmaps to use in the chart type combobox.
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<p> <h2> The Constructor
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</h2>
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<a name="1"></a><p> <pre> OptionsForm::OptionsForm( <a href="tqwidget.html">TQWidget</a>* parent, const char* name,
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bool modal, WFlags f )
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: <a href="ntqdialog.html">TQDialog</a>( parent, name, modal, f )
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{
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<a href="tqwidget.html#setCaption">setCaption</a>( "Chart -- Options" );
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<a href="tqwidget.html#resize">resize</a>( 320, 290 );
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</pre>
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<p> We pass all the arguments on to the <a href="ntqdialog.html">TQDialog</a> constructor, set a caption
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and set an initial size.
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<p> The layout of the form will be to have the chart type label and combo
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box in a horizontal box layout, and similarly for the font button and
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font label, and for the decimal places label and spinbox. The
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buttons will also be placed in a horizontal layout, but with a spacer
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to move them to the right. The show values radio buttons will be
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vertically aligned within a frame. All of these will be laid out in a
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vertical box layout.
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<p> <pre> optionsFormLayout = new <a href="qvboxlayout.html">TQVBoxLayout</a>( this, 11, 6 );
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</pre>
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<p> All the widgets will be laid out within the form's vertical box layout.
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<p> <pre> chartTypeLayout = new <a href="qhboxlayout.html">TQHBoxLayout</a>( 0, 0, 6 );
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</pre>
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<p> The chart type label and combobox will be laid out side by side.
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<p> <pre> chartTypeTextLabel = new <a href="ntqlabel.html">TQLabel</a>( "&Chart Type", this );
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<a name="x2631"></a> chartTypeLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( chartTypeTextLabel );
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chartTypeComboBox = new <a href="ntqcombobox.html">TQComboBox</a>( FALSE, this );
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<a name="x2633"></a> chartTypeComboBox-><a href="ntqcombobox.html#insertItem">insertItem</a>( TQPixmap( options_piechart ), "Pie Chart" );
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chartTypeComboBox-><a href="ntqcombobox.html#insertItem">insertItem</a>( TQPixmap( options_verticalbarchart ),
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"Vertical Bar Chart" );
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chartTypeComboBox-><a href="ntqcombobox.html#insertItem">insertItem</a>( TQPixmap( options_horizontalbarchart ),
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"Horizontal Bar Chart" );
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chartTypeLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( chartTypeComboBox );
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<a name="x2630"></a> optionsFormLayout-><a href="qboxlayout.html#addLayout">addLayout</a>( chartTypeLayout );
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</pre>
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<p> We create the chart type label (with an accelerator which we'll relate
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to the chart type combobox later). We also create a chart type
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combobox, populating it with both pixmaps and text. We add them both
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to the horizontal layout and add the horizontal layout to the form's
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vertical layout.
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<p> <pre> fontLayout = new <a href="qhboxlayout.html">TQHBoxLayout</a>( 0, 0, 6 );
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fontPushButton = new <a href="ntqpushbutton.html">TQPushButton</a>( "&Font...", this );
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fontLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( fontPushButton );
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<a href="qspaceritem.html">TQSpacerItem</a>* spacer = new <a href="qspaceritem.html">TQSpacerItem</a>( 0, 0,
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TQSizePolicy::Expanding,
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TQSizePolicy::Minimum );
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<a name="x2629"></a> fontLayout-><a href="qboxlayout.html#addItem">addItem</a>( spacer );
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fontTextLabel = new <a href="ntqlabel.html">TQLabel</a>( this ); // Must be set by caller via setFont()
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fontLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( fontTextLabel );
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optionsFormLayout-><a href="qboxlayout.html#addLayout">addLayout</a>( fontLayout );
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</pre>
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<p> We create a horizontal box layout to hold the font button and font
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label. The font button is straight-forward. We add a spacer to improve
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the appearance. The font text label is initially empty (since we don't
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know what font the user is using).
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<p> <pre> addValuesFrame = new <a href="ntqframe.html">TQFrame</a>( this );
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<a name="x2640"></a> addValuesFrame-><a href="ntqframe.html#setFrameShape">setFrameShape</a>( TQFrame::StyledPanel );
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<a name="x2639"></a> addValuesFrame-><a href="ntqframe.html#setFrameShadow">setFrameShadow</a>( TQFrame::Sunken );
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addValuesFrameLayout = new <a href="qvboxlayout.html">TQVBoxLayout</a>( addValuesFrame, 11, 6 );
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addValuesButtonGroup = new <a href="ntqbuttongroup.html">TQButtonGroup</a>( "Show Values", addValuesFrame );
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<a name="x2641"></a> addValuesButtonGroup-><a href="ntqgroupbox.html#setColumnLayout">setColumnLayout</a>(0, TQt::Vertical );
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<a name="x2647"></a> addValuesButtonGroup-><a href="tqwidget.html#layout">layout</a>()->setSpacing( 6 );
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addValuesButtonGroup-><a href="tqwidget.html#layout">layout</a>()->setMargin( 11 );
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addValuesButtonGroupLayout = new <a href="qvboxlayout.html">TQVBoxLayout</a>(
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addValuesButtonGroup-><a href="tqwidget.html#layout">layout</a>() );
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<a name="x2644"></a> addValuesButtonGroupLayout-><a href="qlayoutitem.html#setAlignment">setAlignment</a>( TQt::AlignTop );
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noRadioButton = new <a href="ntqradiobutton.html">TQRadioButton</a>( "&No", addValuesButtonGroup );
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<a name="x2645"></a> noRadioButton-><a href="ntqradiobutton.html#setChecked">setChecked</a>( TRUE );
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addValuesButtonGroupLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( noRadioButton );
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yesRadioButton = new <a href="ntqradiobutton.html">TQRadioButton</a>( "&Yes", addValuesButtonGroup );
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addValuesButtonGroupLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( yesRadioButton );
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asPercentageRadioButton = new <a href="ntqradiobutton.html">TQRadioButton</a>( "As &Percentage",
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addValuesButtonGroup );
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addValuesButtonGroupLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( asPercentageRadioButton );
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addValuesFrameLayout-><a href="qboxlayout.html#addWidget">addWidget</a>( addValuesButtonGroup );
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</pre>
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<p> The user may opt to display their own labels as they are or to add the
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values at the end of each label, either as-is or as percentages.
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<p> We create a frame to present the radio buttons in and create a layout
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for them. We create a button group (so that TQt will take care of
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handling the exclusive radio button behaviour automatically). Next we
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create the radio buttons, making "No" the default.
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<p> The decimal places label and spin box are laid out just like the other
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horizontal layouts, and the buttons are laid out in a very similar way
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to the buttons in the set data form.
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<p> <pre> <a href="tqobject.html#connect">connect</a>( fontPushButton, TQ_SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, TQ_SLOT( chooseFont() ) );
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<a href="tqobject.html#connect">connect</a>( okPushButton, TQ_SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, TQ_SLOT( <a href="ntqdialog.html#accept">accept</a>() ) );
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<a href="tqobject.html#connect">connect</a>( cancelPushButton, TQ_SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, TQ_SLOT( <a href="ntqdialog.html#reject">reject</a>() ) );
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</pre>
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<p> We only need three connections:
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<ol type=1>
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<li> When the user clicks the font button we execute our own
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chooseFont() slot.
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<li> If the user clicks OK we call <a href="ntqdialog.html#accept">TQDialog::accept</a>(); it is up to the
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caller to read the data from the dialog's widgets and perform any
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necessary actions.
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<li> If the user clicks Cancel we call <a href="ntqdialog.html#reject">TQDialog::reject</a>().
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</ol>
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<p> <pre> <a name="x2642"></a> chartTypeTextLabel-><a href="ntqlabel.html#setBuddy">setBuddy</a>( chartTypeComboBox );
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decimalPlacesTextLabel-><a href="ntqlabel.html#setBuddy">setBuddy</a>( decimalPlacesSpinBox );
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</pre>
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<p> We use the setBuddy() function to associate widgets with label
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accelerators.
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<p> <h2> The Slots
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</h2>
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<a name="2"></a><p> <pre> void OptionsForm::chooseFont()
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{
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bool ok;
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<a name="x2638"></a> <a href="tqfont.html">TQFont</a> font = TQFontDialog::<a href="tqfontdialog.html#getFont">getFont</a>( &ok, m_font, this );
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if ( ok )
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<a href="tqwidget.html#setFont">setFont</a>( font );
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}
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</pre>
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<p> When the user clicks the Font button this slot is invoked. It simply
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calls the static <a href="tqfontdialog.html#getFont">TQFontDialog::getFont</a>() function to obtain the user's
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choice of font. If they chose a font we call our setFont() slot which
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will present a textual description of the font in the font label.
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<p> <pre> void OptionsForm::<a href="tqwidget.html#setFont">setFont</a>( <a href="tqfont.html">TQFont</a> font )
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{
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<a name="x2635"></a> <a href="tqstring.html">TQString</a> label = font.<a href="tqfont.html#family">family</a>() + " " +
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<a name="x2637"></a> TQString::<a href="tqstring.html#number">number</a>( font.<a href="tqfont.html#pointSize">pointSize</a>() ) + "pt";
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<a name="x2634"></a> if ( font.<a href="tqfont.html#bold">bold</a>() )
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label += " Bold";
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<a name="x2636"></a> if ( font.<a href="tqfont.html#italic">italic</a>() )
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label += " Italic";
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fontTextLabel-><a href="ntqlabel.html#setText">setText</a>( label );
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m_font = font;
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}
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</pre>
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<p> This function displays a textual description of the chosen font in the
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font label and holds a copy of the font in the <tt>m_font</tt> member. We
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need the font in a member so that we can provide a default font for
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chooseFont().
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<p> <p align="right">
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<a href="tutorial2-08.html">« Taking Data</a> |
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<a href="tutorial2.html">Contents</a> |
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