canvas-chart-example.html

QT 下载资料仅供参考

}


void <a name="f559"></a>ChartForm::fileSaveAs()
{
    <a href="qstring.html">QString</a> filename = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(
                            QString::null, "Charts (*.cht)", this,
                            "file save as", "Chart -- File Save As" );
    if ( !filename.<a href="qstring.html#isEmpty">isEmpty</a>() ) {
        int answer = 0;
<a name="x2595"></a>        if ( QFile::<a href="qfile.html#exists">exists</a>( filename ) )
<a name="x2606"></a>            answer = QMessageBox::<a href="qmessagebox.html#warning">warning</a>(
                            this, "Chart -- Overwrite File",
                            QString( "Overwrite\n\'%1\'?" ).
                                arg( filename ),
                            "&amp;Yes", "&amp;No", QString::null, 1, 1 );
        if ( answer == 0 ) {
            m_filename = filename;
            updateRecentFiles( filename );
            fileSave();
            return;
        }
    }
    <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( "Saving abandoned", 2000 );
}


void <a name="f560"></a>ChartForm::fileOpenRecent( int index )
{
    if ( !okToClear() )
        return;

    load( m_recentFiles[index] );
}


void <a name="f561"></a>ChartForm::updateRecentFiles( const <a href="qstring.html">QString</a>&amp; filename )
{
    if ( m_recentFiles.find( filename ) != m_recentFiles.end() )
        return;

    m_recentFiles.push_back( filename );
    if ( m_recentFiles.count() &gt; MAX_RECENTFILES )
        m_recentFiles.pop_front();

    updateRecentFilesMenu();
}


void <a name="f562"></a>ChartForm::updateRecentFilesMenu()
{
    for ( int i = 0; i &lt; MAX_RECENTFILES; ++i ) {
<a name="x2599"></a>        if ( fileMenu-&gt;<a href="qmenudata.html#findItem">findItem</a>( i ) )
<a name="x2602"></a>            fileMenu-&gt;<a href="qmenudata.html#removeItem">removeItem</a>( i );
        if ( i &lt; int(m_recentFiles.count()) )
            fileMenu-&gt;<a href="qmenudata.html#insertItem">insertItem</a>( QString( "&amp;%1 %2" ).
                                    arg( i + 1 ).arg( m_recentFiles[i] ),
                                  this, SLOT( fileOpenRecent(int) ),
                                  0, i );
    }
}


void <a name="f563"></a>ChartForm::fileQuit()
{
    if ( okToClear() ) {
        saveOptions();
<a name="x2592"></a>        qApp-&gt;<a href="qapplication.html#exit">exit</a>( 0 );
    }
}


bool <a name="f564"></a>ChartForm::okToClear()
{
    if ( m_changed ) {
        <a href="qstring.html">QString</a> msg;
        if ( m_filename.isEmpty() )
            msg = "Unnamed chart ";
        else
            msg = QString( "Chart '%1'\n" ).arg( m_filename );
        msg += "has been changed.";
<a name="x2605"></a>        switch( QMessageBox::<a href="qmessagebox.html#information">information</a>( this, "Chart -- Unsaved Changes",
                                          msg, "&amp;Save", "Cancel", "&amp;Abandon",
                                          0, 1 ) ) {
            case 0:
                fileSave();
                break;
            case 1:
            default:
                return false;
                break;
            case 2:
                break;
        }
    }

    return true;
}


void <a name="f565"></a>ChartForm::saveOptions()
{
    <a href="qsettings.html">QSettings</a> settings;
    settings.<a href="qsettings.html#insertSearchPath">insertSearchPath</a>( QSettings::Windows, WINDOWS_REGISTRY );
<a name="x2610"></a>    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowWidth", width() );
    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowHeight", height() );
    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowX", x() );
    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "WindowY", y() );
    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "ChartType", int(m_chartType) );
    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "AddValues", int(m_addValues) );
    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "Decimals", m_decimalPlaces );
    settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "Font", m_font.toString() );
    for ( int i = 0; i &lt; int(m_recentFiles.count()); ++i )
        settings.<a href="qsettings.html#writeEntry">writeEntry</a>( APP_KEY + "File" + QString::number( i + 1 ),
                             m_recentFiles[i] );
}


void <a name="f566"></a>ChartForm::optionsSetData()
{
    SetDataForm *setDataForm = new SetDataForm( &amp;m_elements, m_decimalPlaces, this );
<a name="x2594"></a>    if ( setDataForm-&gt;<a href="qdialog.html#exec">exec</a>() ) {
        m_changed = true;
        drawElements();
    }
    delete setDataForm;
}


void <a name="f567"></a>ChartForm::setChartType( ChartType chartType )
{
    m_chartType = chartType;
    switch ( m_chartType ) {
        case PIE:
<a name="x2588"></a>            optionsPieChartAction-&gt;<a href="qaction.html#setOn">setOn</a>( true );
            break;
        case VERTICAL_BAR:
            optionsVerticalBarChartAction-&gt;<a href="qaction.html#setOn">setOn</a>( true );
            break;
        case HORIZONTAL_BAR:
            optionsHorizontalBarChartAction-&gt;<a href="qaction.html#setOn">setOn</a>( true );
            break;
    }
}


void <a name="f568"></a>ChartForm::updateChartType( <a href="qaction.html">QAction</a> *action )
{
    if ( action == optionsPieChartAction ) {
        m_chartType = PIE;
    }
    else if ( action == optionsHorizontalBarChartAction ) {
        m_chartType = HORIZONTAL_BAR;
    }
    else if ( action == optionsVerticalBarChartAction ) {
        m_chartType = VERTICAL_BAR;
    }

    drawElements();
}


void <a name="f569"></a>ChartForm::optionsSetFont()
{
    bool ok;
<a name="x2598"></a>    <a href="qfont.html">QFont</a> font = QFontDialog::<a href="qfontdialog.html#getFont">getFont</a>( &amp;ok, m_font, this );
    if ( ok ) {
        m_font = font;
        drawElements();
    }
}


void <a name="f570"></a>ChartForm::optionsSetOptions()
{
    OptionsForm *optionsForm = new OptionsForm( this );
    optionsForm-&gt;chartTypeComboBox-&gt;setCurrentItem( m_chartType );
    optionsForm-&gt;<a href="qwidget.html#setFont">setFont</a>( m_font );
    switch ( m_addValues ) {
        case NO:
            optionsForm-&gt;noRadioButton-&gt;setChecked( true );
            break;
        case YES:
            optionsForm-&gt;yesRadioButton-&gt;setChecked( true );
            break;
        case AS_PERCENTAGE:
            optionsForm-&gt;asPercentageRadioButton-&gt;setChecked( true );
            break;
    }
    optionsForm-&gt;decimalPlacesSpinBox-&gt;setValue( m_decimalPlaces );
    if ( optionsForm-&gt;<a href="qdialog.html#exec">exec</a>() ) {
        setChartType( ChartType(
                optionsForm-&gt;chartTypeComboBox-&gt;currentItem()) );
<a name="x2615"></a>        m_font = optionsForm-&gt;<a href="qwidget.html#font">font</a>();
        if ( optionsForm-&gt;noRadioButton-&gt;isChecked() )
            m_addValues = NO;
        else if ( optionsForm-&gt;yesRadioButton-&gt;isChecked() )
            m_addValues = YES;
        else if ( optionsForm-&gt;asPercentageRadioButton-&gt;isChecked() )
            m_addValues = AS_PERCENTAGE;
        m_decimalPlaces = optionsForm-&gt;decimalPlacesSpinBox-&gt;value();
        drawElements();
    }
    delete optionsForm;
}


void <a name="f571"></a>ChartForm::helpHelp()
{
    <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( "Help is not implemented yet", 2000 );
}


void <a name="f572"></a>ChartForm::helpAbout()
{
<a name="x2603"></a>    QMessageBox::<a href="qmessagebox.html#about">about</a>( this, "Chart -- About",
                        "&lt;center&gt;&lt;h1&gt;&lt;font color=blue&gt;Chart&lt;font&gt;&lt;/h1&gt;&lt;/center&gt;"
                        "&lt;p&gt;Chart your data with &lt;i&gt;chart&lt;/i&gt;.&lt;/p&gt;"
                        );
}


void <a name="f573"></a>ChartForm::helpAboutQt()
{
<a name="x2604"></a>    QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Chart -- About Qt" );
}

</pre>

<p> <hr>
<p> Main:
<p> <pre>#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include "chartform.h"


int main( int argc, char *argv[] )
{
    <a href="qapplication.html">QApplication</a> app( argc, argv );

    <a href="qstring.html">QString</a> filename;
<a name="x2618"></a>    if ( app.<a href="qapplication.html#argc">argc</a>() &gt; 1 ) {
<a name="x2619"></a>        filename = app.<a href="qapplication.html#argv">argv</a>()[1];
<a name="x2624"></a>        if ( !filename.<a href="qstring.html#endsWith">endsWith</a>( ".cht" ) )
            filename = QString::null;
    }

    ChartForm *cf = new ChartForm( filename );
    app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( cf );
    cf-&gt;<a href="qwidget.html#show">show</a>();
<a name="x2621"></a>    app.<a href="qobject.html#connect">connect</a>( &amp;app, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), cf, SLOT(fileQuit()) );

    return app.<a href="qapplication.html#exec">exec</a>();
}
</pre>

<p> <p>See also <a href="step-by-step-examples.html">Step-by-step Examples</a>.

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