<!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/examples/iconview/simple_dd/simple_dd.doc:1 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Drag and Drop (Simple)</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>Drag and Drop (Simple)</h1> <p> This provides a very simple example of TQt's drag and drop functionality. <p> For a more complete example see the <a href="dragdrop-example.html">Drag and Drop example</a>. <p> <hr> <p> Header file: <p> <pre>/**************************************************************************** ** $Id: qt/main.h 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include <<a href="qapplication-h.html">ntqapplication.h</a>> #include <<a href="qcursor-h.html">ntqcursor.h</a>> #include <<a href="qsplitter-h.html">ntqsplitter.h</a>> #include <<a href="qlistbox-h.html">ntqlistbox.h</a>> #include <<a href="qiconview-h.html">ntqiconview.h</a>> #include <<a href="qpixmap-h.html">ntqpixmap.h</a>> class TQDragEnterEvent; class TQDragDropEvent; class DDListBox : public <a href="ntqlistbox.html">TQListBox</a> { <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a> public: DDListBox( <a href="ntqwidget.html">TQWidget</a> * parent = 0, const char * name = 0, WFlags f = 0 ); // Low-level drag and drop void dragEnterEvent( <a href="qdragenterevent.html">TQDragEnterEvent</a> *evt ); void dropEvent( <a href="qdropevent.html">TQDropEvent</a> *evt ); void mousePressEvent( <a href="qmouseevent.html">TQMouseEvent</a> *evt ); void mouseMoveEvent( <a href="qmouseevent.html">TQMouseEvent</a> * ); private: int dragging; }; class DDIconViewItem : public <a href="qiconviewitem.html">TQIconViewItem</a> { public: DDIconViewItem( <a href="ntqiconview.html">TQIconView</a> *parent, const <a href="ntqstring.html">TQString</a>& text, const <a href="ntqpixmap.html">TQPixmap</a>& icon ) : <a href="qiconviewitem.html">TQIconViewItem</a>( parent, text, icon ) {} DDIconViewItem( <a href="ntqiconview.html">TQIconView</a> *parent, const <a href="ntqstring.html">TQString</a> &text ) : <a href="qiconviewitem.html">TQIconViewItem</a>( parent, text ) {} // High-level drag and drop bool acceptDrop( const <a href="qmimesource.html">TQMimeSource</a> *mime ) const; void dropped( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& ); }; class DDIconView : public <a href="ntqiconview.html">TQIconView</a> { TQ_OBJECT public: DDIconView( <a href="ntqwidget.html">TQWidget</a> * parent = 0, const char * name = 0, WFlags f = 0 ) : <a href="ntqiconview.html">TQIconView</a>( parent, name, f ) {} // High-level drag and drop <a href="ntqdragobject.html">TQDragObject</a> *dragObject(); public slots: void slotNewItem( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& list ); }; </pre> <p> <hr> <p> Implementation: <p> <pre>/**************************************************************************** ** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "main.h" const char* red_icon[]={ "16 16 2 1", "r c red", ". c None", "................", "................", "..rrrrrrrrrrrr..", "..rrrrrrrrrrrr..", "..rrrrrrrrrrrr..", "..rrr......rrr..", "..rrr......rrr..", "..rrr......rrr..", "..rrr......rrr..", "..rrr......rrr..", "..rrr......rrr..", "..rrrrrrrrrrrr..", "..rrrrrrrrrrrr..", "..rrrrrrrrrrrr..", "................", "................"}; const char* blue_icon[]={ "16 16 2 1", "b c blue", ". c None", "................", "................", "..bbbbbbbbbbbb..", "..bbbbbbbbbbbb..", "..bbbbbbbbbbbb..", "..bbb......bbb..", "..bbb......bbb..", "..bbb......bbb..", "..bbb......bbb..", "..bbb......bbb..", "..bbb......bbb..", "..bbbbbbbbbbbb..", "..bbbbbbbbbbbb..", "..bbbbbbbbbbbb..", "................", "................"}; const char* green_icon[]={ "16 16 2 1", "g c green", ". c None", "................", "................", "..gggggggggggg..", "..gggggggggggg..", "..gggggggggggg..", "..ggg......ggg..", "..ggg......ggg..", "..ggg......ggg..", "..ggg......ggg..", "..ggg......ggg..", "..ggg......ggg..", "..gggggggggggg..", "..gggggggggggg..", "..gggggggggggg..", "................", "................"}; // ListBox -- low level drag and drop <a name="f589"></a>DDListBox::DDListBox( <a href="ntqwidget.html">TQWidget</a> * parent, const char * name, WFlags f ) : <a href="ntqlistbox.html">TQListBox</a>( parent, name, f ) { <a href="ntqwidget.html#setAcceptDrops">setAcceptDrops</a>( TRUE ); dragging = FALSE; } <a name="x2829"></a>void DDListBox::<a href="ntqwidget.html#dragEnterEvent">dragEnterEvent</a>( <a href="qdragenterevent.html">TQDragEnterEvent</a> *evt ) { <a name="x2827"></a> if ( TQTextDrag::<a href="qtextdrag.html#canDecode">canDecode</a>( evt ) ) <a name="x2819"></a> evt-><a href="qdragmoveevent.html#accept">accept</a>(); } <a name="x2830"></a>void DDListBox::<a href="ntqwidget.html#dropEvent">dropEvent</a>( <a href="qdropevent.html">TQDropEvent</a> *evt ) { <a href="ntqstring.html">TQString</a> text; <a name="x2828"></a> if ( TQTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, text ) ) <a href="ntqlistbox.html#insertItem">insertItem</a>( text ); } <a name="x2832"></a>void DDListBox::<a href="ntqwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *evt ) { TQListBox::<a href="ntqwidget.html#mousePressEvent">mousePressEvent</a>( evt ); dragging = TRUE; } <a name="x2831"></a>void DDListBox::<a href="ntqwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> * ) { if ( dragging ) { <a href="ntqdragobject.html">TQDragObject</a> *d = new <a href="qtextdrag.html">TQTextDrag</a>( currentText(), this ); <a name="x2818"></a> d-><a href="ntqdragobject.html#dragCopy">dragCopy</a>(); // do NOT delete d. dragging = FALSE; } } // IconViewIcon -- high level drag and drop <a name="x2822"></a>bool DDIconViewItem::<a href="qiconviewitem.html#acceptDrop">acceptDrop</a>( const <a href="qmimesource.html">TQMimeSource</a> *mime ) const { <a name="x2825"></a> if ( mime-><a href="qmimesource.html#provides">provides</a>( "text/plain" ) ) return TRUE; return FALSE; } <a name="x2823"></a>void DDIconViewItem::<a href="qiconviewitem.html#dropped">dropped</a>( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& ) { <a href="ntqstring.html">TQString</a> label; if ( TQTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, label ) ) setText( label ); } // IconView -- high level drag and drop <a name="x2820"></a>TQDragObject *DDIconView::<a href="ntqiconview.html#dragObject">dragObject</a>() { return new <a href="qtextdrag.html">TQTextDrag</a>( <a href="ntqiconview.html#currentItem">currentItem</a>()->text(), this ); } void <a name="f588"></a>DDIconView::slotNewItem( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& ) { <a href="ntqstring.html">TQString</a> label; if ( TQTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, label ) ) { DDIconViewItem *item = new DDIconViewItem( this, label ); <a name="x2824"></a> item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE ); } } int main( int argc, char *argv[] ) { <a href="ntqapplication.html">TQApplication</a> app( argc, argv ); // Create and show the widgets <a href="ntqsplitter.html">TQSplitter</a> *split = new <a href="ntqsplitter.html">TQSplitter</a>(); DDIconView *iv = new DDIconView( split ); (void) new DDListBox( split ); app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( split ); split-><a href="ntqwidget.html#resize">resize</a>( 600, 400 ); split-><a href="ntqwidget.html#show">show</a>(); // Set up the connection so that we can drop items into the icon view TQObject::<a href="ntqobject.html#connect">connect</a>( <a name="x2821"></a> iv, SIGNAL(<a href="ntqiconview.html#dropped">dropped</a>(TQDropEvent*, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>&)), iv, SLOT(slotNewItem(TQDropEvent*, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>&))); // Populate the TQIconView with icons DDIconViewItem *item; item = new DDIconViewItem( iv, "Red", TQPixmap( red_icon ) ); item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE ); item = new DDIconViewItem( iv, "Green", TQPixmap( green_icon ) ); item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE ); item = new DDIconViewItem( iv, "Blue", TQPixmap( blue_icon ) ); item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE ); return app.<a href="ntqapplication.html#exec">exec</a>(); } </pre> <p> <p>See also <a href="examples.html">Examples</a>. <!-- 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>TQt 3.3.8</div> </table></div></address></body> </html>