Re: [platform-swt-dev] Capturing Drop events over browser widget

[Veronika Irvine <Veronika_Irvine@xxxxxxxxxx>]

Currently it is not possible to make a drop target for the browser.  A 
drop target is for a specific widget and the Browser is actually a 
collection of many widgets - some of which are already registered as drop 
targets by the underlying web browser.




"Lopez, Edwin R" <edwin.r.lopez@xxxxxxxxxxx> 
Sent by: platform-swt-dev-bounces@xxxxxxxxxxx
08/23/2005 06:05 PM
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[platform-swt-dev] Capturing Drop events over browser widget






Hello,
 
I'm trying to capture the drop (FileTransfer) event in a browser widget. I 
tried hooking a DropTarget( ) to the *.swt.browser widget with no success. 
Then I tried to go the Ole way and create a Shell.Explorer site automation 
and try to hook the DropTarget( ) to both the OleFrame and OleControlSite 
with no success. (yeah, I'm kind of hacking it)
 
I have the feeling that I need to enable something in the Ole control and 
use some sort of OleListener.. but I can't find clear documentation of how 
get deep down in the API and capture drag/drop events.
 
Have anyone done anything in this area?
 
Any input would be appreciated. Below is a short program  demostrating 
what I'm trying to do. Step D is the one I'm having trouble with, getting 
the Drop listener to work.
 
Thank you,
-Edwin

 
 
import org.eclipse.swt.*;
import org.eclipse.swt.ole.win32.*;
import org.eclipse.swt.internal.ole.win32.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.dnd.*;

public class test 
{ 
public static void main(String[] args) 
{
 //a. Create Shell
Display display = new Display();
Shell shell = new Shell( display );
shell.setSize( 610, 400 );

//b. Create Browser (the old way)
OleFrame frame = new OleFrame( shell, SWT.NONE );
OleControlSite site = new OleControlSite( frame, SWT.NONE, 
"Shell.Explorer" );
site.doVerb( OLE.OLEIVERB_INPLACEACTIVATE );
OleAutomation browser = new OleAutomation( site );


//c. Disable "link navigation" and go to google
int[] nameIds = browser.getIDsOfNames(new String[] { 
"RegisterAsDropTarget"} ); //is this really necessary (I wonder)? 
browser.setProperty(nameIds[0], new Variant(false) ); //true or false 
--doesn't work

nameIds = browser.getIDsOfNames( new String[] { "Navigate", "URL"} );
browser.invoke( nameIds[0], new Variant[] { new Variant("
http://www.google.com";) },
new int[] { nameIds[1] } );


//d. Listen to drop events ???
DropTarget target = new DropTarget(frame, DND.DROP_COPY ); // <--help 
here!!!
target.setTransfer( new Transfer[] { FileTransfer.getInstance() } );
target.addDropListener( new DropTargetListener()
{ 
        public void dragEnter(DropTargetEvent event) { System.out.println(
"drag enter"); }
        public void dragLeave(DropTargetEvent event) { System.out.println(
"drag leave");}
        public void dragOver(DropTargetEvent event) { System.out.println(
"drag over");}
        public void dragOperationChanged(DropTargetEvent event) { 
System.out.println("drag changed");}
        public void dropAccept(DropTargetEvent event) { 
System.out.println("drag accept");}
        public void drop(DropTargetEvent event) 
        { 
                String[] files = (String[]) event.data; //expects 
FileTransfer data
                for (int p=0;p<files.length; p++)
                System.out.println( files[p] );
        }/*drop*/
});



//e. Show window
frame.setBounds( 0,0, 600, 400 );
shell.open(); 

while (!shell.isDisposed()) 
{ 
        if (!display.readAndDispatch())
                display.sleep();
} /*while*/

browser.dispose();
display.dispose();
}/*main*/
 
}/*test*/ _______________________________________________
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