From bd0f3345a938b35ce6a12f6150373b0955b8dd12 Mon Sep 17 00:00:00 2001 From: Timothy Pearson Date: Sun, 10 Jul 2011 15:24:15 -0500 Subject: Add Qt3 development HEAD version --- doc/html/simple_dd-example.html | 305 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 305 insertions(+) create mode 100644 doc/html/simple_dd-example.html (limited to 'doc/html/simple_dd-example.html') diff --git a/doc/html/simple_dd-example.html b/doc/html/simple_dd-example.html new file mode 100644 index 0000000..8184c76 --- /dev/null +++ b/doc/html/simple_dd-example.html @@ -0,0 +1,305 @@ + + + + + +Drag and Drop (Simple) + + + + + + + +

Drag and Drop (Simple)

+ + +

+This provides a very simple example of Qt's drag and drop +functionality. +

For a more complete example see the Drag and Drop example. +

Header file: +

/****************************************************************************
+** $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 Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include <qapplication.h>
+#include <qcursor.h>
+#include <qsplitter.h>
+#include <qlistbox.h>
+#include <qiconview.h>
+#include <qpixmap.h>
+
+class QDragEnterEvent;
+class QDragDropEvent;
+
+
+class DDListBox : public QListBox
+{
+    Q_OBJECT
+public:
+    DDListBox( QWidget * parent = 0, const char * name = 0, WFlags f = 0 );
+    // Low-level drag and drop
+    void dragEnterEvent( QDragEnterEvent *evt );
+    void dropEvent( QDropEvent *evt );
+    void mousePressEvent( QMouseEvent *evt );
+    void mouseMoveEvent( QMouseEvent * );
+private:
+    int dragging;
+};
+
+
+class DDIconViewItem : public QIconViewItem
+{
+public:
+    DDIconViewItem( QIconView *parent, const QString& text, const QPixmap& icon ) :
+        QIconViewItem( parent, text, icon ) {}
+    DDIconViewItem( QIconView *parent, const QString &text ) :
+        QIconViewItem( parent, text ) {}
+    // High-level drag and drop
+    bool acceptDrop( const QMimeSource *mime ) const;
+    void dropped( QDropEvent *evt, const QValueList<QIconDragItem>& );
+};
+
+
+class DDIconView : public QIconView
+{
+    Q_OBJECT
+public:
+    DDIconView( QWidget * parent = 0, const char * name = 0, WFlags f = 0 ) :
+        QIconView( parent, name, f ) {}
+    // High-level drag and drop
+    QDragObject *dragObject();
+public slots:
+    void slotNewItem( QDropEvent *evt, const QValueList<QIconDragItem>& list );
+};
+
+

+ +

Implementation: +

/****************************************************************************
+** $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 Qt.  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
+
+DDListBox::DDListBox( QWidget * parent, const char * name, WFlags f ) :
+    QListBox( parent, name, f )
+{
+    setAcceptDrops( TRUE );
+    dragging = FALSE;
+}
+
+
+void DDListBox::dragEnterEvent( QDragEnterEvent *evt )
+{
+    if ( QTextDrag::canDecode( evt ) )
+        evt->accept();
+}
+
+
+void DDListBox::dropEvent( QDropEvent *evt )
+{
+    QString text;
+
+    if ( QTextDrag::decode( evt, text ) )
+        insertItem( text );
+}
+
+
+void DDListBox::mousePressEvent( QMouseEvent *evt )
+{
+    QListBox::mousePressEvent( evt );
+    dragging = TRUE;
+}
+
+
+void DDListBox::mouseMoveEvent( QMouseEvent * )
+{
+    if ( dragging ) {
+        QDragObject *d = new QTextDrag( currentText(), this );
+        d->dragCopy(); // do NOT delete d.
+        dragging = FALSE;
+    }
+}
+
+
+// IconViewIcon -- high level drag and drop
+
+
+bool DDIconViewItem::acceptDrop( const QMimeSource *mime ) const
+{
+    if ( mime->provides( "text/plain" ) )
+        return TRUE;
+    return FALSE;
+}
+
+
+void DDIconViewItem::dropped( QDropEvent *evt, const QValueList<QIconDragItem>& )
+{
+    QString label;
+
+    if ( QTextDrag::decode( evt, label ) )
+        setText( label );
+}
+
+
+// IconView -- high level drag and drop
+
+QDragObject *DDIconView::dragObject()
+{
+  return new QTextDrag( currentItem()->text(), this );
+}
+
+void DDIconView::slotNewItem( QDropEvent *evt, const QValueList<QIconDragItem>& )
+{
+    QString label;
+
+    if ( QTextDrag::decode( evt, label ) ) {
+        DDIconViewItem *item = new DDIconViewItem( this, label );
+        item->setRenameEnabled( TRUE );
+    }
+}
+
+
+
+int main( int argc, char *argv[] )
+{
+    QApplication app( argc, argv );
+
+    // Create and show the widgets
+    QSplitter *split = new QSplitter();
+    DDIconView *iv   = new DDIconView( split );
+    (void)             new DDListBox( split );
+    app.setMainWidget( split );
+    split->resize( 600, 400 );
+    split->show();
+
+    // Set up the connection so that we can drop items into the icon view
+    QObject::connect(
+        iv, SIGNAL(dropped(QDropEvent*, const QValueList<QIconDragItem>&)),
+        iv, SLOT(slotNewItem(QDropEvent*, const QValueList<QIconDragItem>&)));
+
+    // Populate the QIconView with icons
+    DDIconViewItem *item;
+    item = new DDIconViewItem( iv, "Red",   QPixmap( red_icon ) );
+    item->setRenameEnabled( TRUE );
+    item = new DDIconViewItem( iv, "Green", QPixmap( green_icon ) );
+    item->setRenameEnabled( TRUE );
+    item = new DDIconViewItem( iv, "Blue",  QPixmap( blue_icon ) );
+    item->setRenameEnabled( TRUE );
+
+    return app.exec();
+}
+
+
+

+ +