Drag processing of Java text

Import javax.swing.*;
Import java.awt.dnd.*;
Import java.awt.datatransfer.*;

public class Draglabel extends JLabel implements droptargetlistener{

Public Draglabel (String str) {
Super (STR); Calling the parent class constructor
}

public void DragEnter (Droptargetdragevent evt) {
}
public void DragOver (Droptargetdragevent evt) {
}
public void dropactionchanged (Droptargetdragevent evt) {
}
public void Dragexit (Droptargetevent evt) {
}
public void Drop (droptargetdropevent evt) {//Drag action Processing
try{
Transferable trans = evt.gettransferable (); Be able to transferable objects
if (evt.isdataflavorsupported (Dataflavor.stringflavor)) {//whether to support dragging
Evt.acceptdrop (Evt.getdropaction ()); Accept Drag
string s = (string) trans.gettransferdata (Dataflavor.stringflavor); Get Drag data
SetText (s); Set the text of a label
Evt.dropcomplete (TRUE); End drag
}else{
Evt.rejectdrop (); Refuse to consignment

}
}catch (Exception err) {
Err.printstacktrace (); Output error message
}
}

}

Import java.awt.dnd.*;
Import java.awt.datatransfer.*;
Import javax.swing.*;

public class Draglist extends JList implements Draggesturelistener, dragsourcelistener{

DragSource Dragsource=dragsource.getdefaultdragsource (); Drag source
Public draglist (object[] data) {//constructor
Super (data);
int action = Dndconstants.action_copy_or_move; Drag type
Dragsource.createdefaultdraggesturerecognizer (This,action,this); Create drag recognition
}

public void draggesturerecognized (Draggestureevent dge) {
try{
Transferable trans = new StringSelection (This.getselectedvalue (). toString ()); Get the dragged transferable object
Dge.startdrag (Dragsource.defaultcopynodrop,trans,this); Start the drag operation
}catch (Exception err) {
Err.printstacktrace (); Output error message
}
}

public void DragEnter (Dragsourcedragevent dragsourcede) {//Drag entry processing
DragSourceContext DragSourceContext = Dragsourcede.getdragsourcecontext (); Get Drag Context Object
int action = Dragsourcede.getdropaction (); Get drag command
if ((action&dndconstants.action_copy)!=0)//judgment command type
Dragsourcecontext.setcursor (Dragsource.defaultcopydrop); Set Cursor type
Else
Dragsourcecontext.setcursor (Dragsource.defaultcopynodrop);
}
public void DragOver (Dragsourcedragevent dragsourcede) {
}
public void dropactionchanged (Dragsourcedragevent dragsourcede) {
}
public void Dragexit (Dragsourceevent dragsourcee) {
}
public void Dragdropend (Dragsourcedropevent dragsourcede) {
}
}
Instance:

Import java.awt.*;
Import javax.swing.*;
Import Javax.swing.JSplitPane;
Import java.awt.dnd.*;

Drag handling of text

public class Dragtextdemo extends jframe{

Public Dragtextdemo () {
Super ("Drag Processing of text"); Calling the parent class constructor

string[] data = {"One", "two", "three", "four"}; An array of characters used to construct a list box
Draglist list=new draglist (data); List Box instance
JTextArea jta=new JTextArea (8,20); Text Box instance
Draglabel label=new Draglabel ("drag target"); Label instance

Jta.setlinewrap (TRUE); Set up Wrap Line
Jta.setdragenabled (TRUE); text box to drag
New DropTarget (Label,dndconstants.action_copy,label); Instantiate drag target as label

Container Container=getcontentpane (); Get the container
JSplitPane split=new JSplitPane (jsplitpane.horizontal_split); Instantiating the separator panel
Split.setdividerlocation (140); Set the separator position
Split.add (list); Add Component to Separator panel
Split.add (JTA);
Container.add (Split,borderlayout.center); Adding components to the container
Container.add (Label,borderlayout.south);

SetSize (300,150); Set Window size
SetVisible (TRUE); Set window to Visual
Setdefaultcloseoperation (Jframe.exit_on_close); Exit Program when window closes
}

public static void Main (string[] args) {
New Dragtextdemo ();
}
}
Effect Chart: