How to implement drag/drop ?

Hello,
I want to build a GUI showing the view of a weekly calendar.
(Days on the Y Axis and events for that day on the X axis)
I want to draw each event as a rectangle. Also, I want to be able to drag the rectangles, and draw
them using rubberbanding (i.e hold the left mouse button down and drag to create a new event)
Is it a good idea to use Java 2D to create the above kind of functionality ?
Or should I be trying AWT or Swing instead ?
I think it will be easier to get the click and mouse move events if I draw each event as an AWT component.
But I am not sure how I am going to be able to handle drawing the events at the exact co-ordinates if
I use AWT.
Basically, I am stuck on whether to choose Java 2D or to choose AWT/Swing ?
Please guide me through your experience.
Ajay

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Hey guys,
we have a graphical editor that we realized with GEF. In this graphical editor you are able to create a process by dragging and dropping elements from the palette and connecting them.
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sar_lax,
Have you done any research at all? Even tried to find code examples other than posting here? Try this:
1) go to www.google.com
2) enter search words "java drag and drop"
--A

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That works if all the data is available as a file at the point where you start the drag.
In my case it is not, I have got to go get it from the database, and that can take up to 30 seconds.
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Best regards,
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Ok, thanks for not answering anyway.
I have managed to get the solution by myself. I just put a e.preventDefault(); function when dragging, and it just worked.
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Best regards

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Do the way like DnD text for Label, except you put the entire JLabel component as Transferable data object.
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ImageIcon copyIcon = new ImageIcon("c:\\tmp\\drag_copy.gif");
System.err.println(copyIcon.getIconWidth() + "; " + copyIcon.getIconHeight());
copyCursor = Toolkit.getDefaultToolkit().createCustomCursor(
copyIcon.getImage(), new java.awt.Point(0, 0), "I30COPY");
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I just found a solution right here:
http://www.javaworld.com/javaworld/javatips/jw-javatip114.html

How i can do a drag drop between container (grid)?

I am trying to work out a task with Drag and Drop(WPF ,C#)to include in a demo ,i will explain easy showing an example of code in XAML
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid x:Name="container1" Grid.Row="0" >
<Grid Name="grid1" Background="Aqua" Margin="15"></Grid>
</Grid>
<Grid x:Name="container2" Grid.Row="1" >
<Grid Name="grid2" Background="blue" Margin="15"></Grid>
</Grid>
<Grid x:Name="container3" Grid.Row="2" >
<Grid Name="grid3" Background="green" Margin="15"></Grid>
</Grid>
</Grid>
My purpose is when the user drag the
grid1 in the
container2 automatically the grid2 will go to place in the
container1 (basically I want to swap the grids) then this process will be used every time need to drag a grid in a container. with a code that i wrote down i can do a simple drag&drop i can drag the "grid1"
to the "container2" but cannot send back automatically the grid2 to container1.
Kindly i ask if you have any advise or tips to make successful this task.
Thank you so much for your attention
Cheers!!!
*********EDIT*********
Using this code as follow i can do the drag&drop but what really i need is the grid "container "is fix and never move just the
"grid" should move between the "container "
<StackPanel Name="sp" AllowDrop="True" Background="SkyBlue" PreviewMouseLeftButtonDown="sp_PreviewMouseLeftButtonDown" PreviewMouseLeftButtonUp="sp_PreviewMouseLeftButtonUp" PreviewMouseMove="sp_PreviewMouseMove"
DragEnter="sp_DragEnter" Drop="sp_Drop">
<Grid Name="grid1" Background="Aqua" Height="120" Width="500"></Grid>
<Grid Name="grid2" Background="Blue" Height="120" Width="500"></Grid>
<Grid Name="grid3" Background="Red" Height="120" Width="500"></Grid>
</StackPanel>
private bool _isDown;
private bool _isDragging;
private Point _startPoint;
private UIElement _realDragSource;
private UIElement _dummyDragSource = new UIElement();
public MainWindow()
InitializeComponent();
private void sp_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
if (e.Source == this.sp)
else
_isDown = true;
_startPoint = e.GetPosition(this.sp);
private void sp_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
_isDown = false;
_isDragging = false;
_realDragSource.ReleaseMouseCapture();
private void sp_PreviewMouseMove(object sender, MouseEventArgs e)
if (_isDown)
if ((_isDragging == false) && ((Math.Abs(e.GetPosition(this.sp).X - _startPoint.X) > SystemParameters.MinimumHorizontalDragDistance) ||
(Math.Abs(e.GetPosition(this.sp).Y - _startPoint.Y) > SystemParameters.MinimumVerticalDragDistance)))
_isDragging = true;
_realDragSource = e.Source as UIElement;
_realDragSource.CaptureMouse();
DragDrop.DoDragDrop(_dummyDragSource, new DataObject("UIElement", e.Source, true), DragDropEffects.Move);
private void sp_DragEnter(object sender, DragEventArgs e)
if (e.Data.GetDataPresent("UIElement"))
e.Effects = DragDropEffects.Move;
private void sp_Drop(object sender, DragEventArgs e)
if (e.Data.GetDataPresent("UIElement"))
UIElement droptarget = e.Source as UIElement;
int droptargetIndex=-1, i =0;
foreach (UIElement element in this.sp.Children)
if (element.Equals(droptarget))
droptargetIndex = i;
break;
i++;
if (droptargetIndex != -1)
this.sp.Children.Remove(_realDragSource);
this.sp.Children.Insert(droptargetIndex, _realDragSource);
_isDown = false;
_isDragging = false;
_realDragSource.ReleaseMouseCapture();
Thanks :)

Hello Jonny,
Currently I do not have a sample and I have reviewed this post and find another way which seems more reasonable. Have you cosidered use a ListView instead of common grid. It seems we can do what you want with two common grid however we need to hardcoded
all the things.
If we use ListView, for example, you can see this thread:
http://stackoverflow.com/questions/20573063/creating-icon-view-mode-for-listview-wpf
and this thread:
http://stackoverflow.com/questions/9443695/how-do-i-drag-drop-items-in-the-same-listview
We can drag and drop items instead of grid, which will make this programming much easier than hard code to switch your control's location.
Best regards,
Barry
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Dear Barry Wang thank you so much for your kind support ,just open me a way to do it ,you can see in this post https://social.msdn.microsoft.com/Forums/vstudio/en-US/55873851-e86c-4a20-9b00-de3419054ba8/get-stuck-to-dragdrop-in-this-case?forum=wpf .
Wish you a Happy New Year .
Sincerley

Drag & Drop Links

Hey,
could someone help me to find an example or a tutorial how to code Drag & Drop for Files?
In my demo I'd like to get the file path of a dragged object (e.g. a folder or a file from somewhere on the desktop or from the explorer..). All I could find so far was drag and drop for labels, texts etc, displayed in the same program somewhere.
I know that the file thing should be possible, too, but can't find usefull information on that, like articles or how tos or any kind of links. TIA

As I overflew it briefly, it seems that it's only
possible if the "File" to drag is already contained
in a Java JFrame like window - is there no way to
simply drag a file from somewhere on the desktop or
the explorer on to the Java application (I know, it
seems to be hardly possible to provide functionality
like this and to stay system independant, but is
there a way)?There must be - I meant this is exactly what I did. But it was long ago... I remember it wasn't very complicated to implement, but I don't remember how I did it. Sorry.

How to implement drag/drop ?

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