Added a drag and drop example.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8221 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
2026-05-22 15:22:34 +08:00 · 2011-01-08 18:58:50 +00:00
parent ba82efddcd
commit 3715d38360
1 changed files with 103 additions and 0 deletions
@@ -0,0 +1,103 @@
+//
+// "$Id$"
+//
+//     A simple demo of drag+drop with FLTK. 
+//     Originally from erco's cheat sheet, permission by author.
+//     Inspired by Michael Sephton's original example posted on fltk.general.
+//
+//     When you run the program, just drag the red square over
+//     to the green square to show a 'drag and drop' sequence.
+//
+// Copyright 1998-2010 by Bill Spitzak and others.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+#include <stdio.h>
+#include <FL/Fl.H>
+#include <FL/Fl_Window.H>
+#include <FL/Fl_Box.H>
+
+// SIMPLE SENDER CLASS
+class Sender : public Fl_Box {
+public:
+  // Ctor
+  Sender(int x,int y,int w,int h) : Fl_Box(x,y,w,h) {
+    box(FL_FLAT_BOX);
+    color(9);
+    label("Drag\nfrom\nhere..");
+  }
+  // Sender event handler
+  int handle(int event) {
+    int ret = Fl_Box::handle(event);
+    switch ( event ) {
+      case FL_PUSH: {             // do 'copy/dnd' when someone clicks on box
+        const char *msg = "It works!";
+	Fl::copy(msg,strlen(msg),0);
+	Fl::dnd();
+	ret = 1;
+	break;
+      }
+    }
+    return(ret);
+  }
+};
+// SIMPLE RECEIVER CLASS
+class Receiver : public Fl_Box {
+public:
+  // Ctor
+  Receiver(int x,int y,int w,int h) : Fl_Box(x,y,w,h) {
+    box(FL_FLAT_BOX); color(10); label("..to\nhere");
+  }
+  // Receiver event handler
+  int handle(int event) {
+    int ret = Fl_Box::handle(event);
+    switch ( event ) {
+      case FL_DND_ENTER:          // return(1) for these events to 'accept' dnd
+      case FL_DND_DRAG:
+      case FL_DND_RELEASE:
+	ret = 1;
+	break;
+      case FL_PASTE:              // handle actual drop (paste) operation
+	label(Fl::event_text());
+	fprintf(stderr, "Pasted '%s'\n", Fl::event_text());
+	ret = 1;
+	break;
+    }
+    return(ret);
+  }
+};
+int main(int argc, char **argv) {
+  // Create sender window and widget
+  Fl_Window win_a(0,0,200,100,"Sender");
+  Sender a(0,0,100,100);
+  win_a.end();
+  win_a.show();
+  // Create receiver window and widget
+  Fl_Window win_b(400,0,200,100,"Receiver");
+  Receiver b(100,0,100,100);
+  win_b.end();
+  win_b.show();
+  return(Fl::run());
+}
+
+//
+// End of "$Id$".
+//