source: trunk/doc/html/chart-chartform_files-cpp.html

Last change on this file was 190, checked in by rudi, 14 years ago

reference documentation added
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6<title>chart/chartform_files.cpp Example File</title>
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32<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>chart/chartform_files.cpp Example File</h1>
33
34
35<pre>#include "canvasview.h"
36#include "chartform.h"
37
38#include &lt;<a href="qfile-h.html">qfile.h</a>&gt;
39#include &lt;<a href="qfiledialog-h.html">qfiledialog.h</a>&gt;
40#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
41#include &lt;<a href="qprinter-h.html">qprinter.h</a>&gt;
42#include &lt;<a href="qstatusbar-h.html">qstatusbar.h</a>&gt;
43
44
45void <a name="f172"></a>ChartForm::load( const <a href="qstring.html">QString</a>&amp; filename )
46{
47 <a href="qfile.html">QFile</a> file( filename );
48 if ( !file.<a href="qfile.html#open">open</a>( IO_ReadOnly ) ) {
49 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( QString( "Failed to load \'%1\'" ).
50 arg( filename ), 2000 );
51 return;
52 }
53
54 init(); // Make sure we have colours
55 m_filename = filename;
56 <a href="qtextstream.html">QTextStream</a> ts( &amp;file );
57 Element element;
58 int errors = 0;
59 int i = 0;
60 while ( !ts.<a href="qtextstream.html#eof">eof</a>() ) {
61 ts &gt;&gt; element;
62 if ( element.isValid() )
63 m_elements[i++] = element;
64 else
65 errors++;
66 if ( i == MAX_ELEMENTS ) {
67 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message(
68 QString( "Read maximum number of elements (%1)"
69 " discarding others" ).arg( i ), 2000 );
70 break;
71 }
72 }
73
74 file.<a href="qfile.html#close">close</a>();
75
76 <a href="qstring.html">QString</a> bad = "";
77 if ( errors ) {
78 bad = QString( "; skipped " ) + QString::number( errors ) + " bad record";
79 if ( errors &gt; 1 )
80 bad += "s";
81 }
82 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( QString( "Read %1 values from \'%2\'%3" ).
83 arg( i ).arg( filename ).arg( bad ), 3000 );
84
85 <a href="qwidget.html#setCaption">setCaption</a>( QString( "Chart -- %1" ).arg( filename ) );
86 updateRecentFiles( filename );
87
88 drawElements();
89 m_changed = FALSE;
90}
91
92
93void <a name="f173"></a>ChartForm::fileSave()
94{
95 if ( m_filename.isEmpty() ) {
96 fileSaveAs();
97 return;
98 }
99
100 <a href="qfile.html">QFile</a> file( m_filename );
101 if ( !file.<a href="qfile.html#open">open</a>( IO_WriteOnly ) ) {
102 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( QString( "Failed to save \'%1\'" ).
103 arg( m_filename ), 2000 );
104 return;
105 }
106 <a href="qtextstream.html">QTextStream</a> ts( &amp;file );
107 for ( int i = 0; i &lt; MAX_ELEMENTS; ++i )
108 if ( m_elements[i].isValid() )
109 ts &lt;&lt; m_elements[i];
110
111 file.<a href="qfile.html#close">close</a>();
112
113 <a href="qwidget.html#setCaption">setCaption</a>( QString( "Chart -- %1" ).arg( m_filename ) );
114 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( QString( "Saved \'%1\'" ).arg( m_filename ), 2000 );
115 m_changed = FALSE;
116}
117
118
119void <a name="f174"></a>ChartForm::fileSaveAsPixmap()
120{
121 <a href="qstring.html">QString</a> filename = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(
122 QString::null, "Images (*.png *.xpm *.jpg)",
123 this, "file save as bitmap",
124 "Chart -- File Save As Bitmap" );
125 if ( QPixmap::<a href="qpixmap.html#grabWidget">grabWidget</a>( m_canvasView ).
126 save( filename,
127 filename.<a href="qstring.html#mid">mid</a>( filename.<a href="qstring.html#findRev">findRev</a>( '.' ) + 1 ).upper() ) )
128 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( QString( "Wrote \'%1\'" ).arg( filename ), 2000 );
129 else
130 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( QString( "Failed to write \'%1\'" ).
131 arg( filename ), 2000 );
132}
133
134void <a name="f175"></a>ChartForm::filePrint()
135{
136 if ( !m_printer )
137 m_printer = new <a href="qprinter.html">QPrinter</a>;
138 if ( m_printer-&gt;<a href="qprinter.html#setup">setup</a>() ) {
139 <a href="qpainter.html">QPainter</a> painter( m_printer );
140 m_canvas-&gt;drawArea( QRect( 0, 0, m_canvas-&gt;width(), m_canvas-&gt;height() ),
141 &amp;painter, FALSE );
142 if ( !m_printer-&gt;<a href="qprinter.html#outputFileName">outputFileName</a>().isEmpty() )
143 <a href="qmainwindow.html#statusBar">statusBar</a>()-&gt;message( QString( "Printed \'%1\'" ).
144 arg( m_printer-&gt;<a href="qprinter.html#outputFileName">outputFileName</a>() ), 2000 );
145 }
146}
147
148</pre><!-- eof -->
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153<td align=right><div align=right>Qt 3.3.8</div>
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