Attachment 185075 Details for Bug 327893 – SWT Snippet for hosting a 'drag shell'

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SWT Snippet for hosting a 'drag shell'

Snippet31.java (text/java), 6.56 KB, created by Eric Moffatt

on 2010-12-13 11:14:43 EST

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Creator: Eric Moffatt

Created: 2010-12-13 11:14:43 EST

Size: 6.56 KB

patch

obsolete

>package zz;
>
>/*
> * Tracker example snippet: create a tracker (drag when "torn off")
> *
> * For a list of all SWT example snippets see
> * http://www.eclipse.org/swt/snippets/
> */
>import java.util.ArrayList;
>
>import org.eclipse.swt.*;
>import org.eclipse.swt.graphics.*;
>import org.eclipse.swt.layout.RowLayout;
>import org.eclipse.swt.widgets.*;
>import org.eclipse.ui.internal.DragHandle;
>
>public class Snippet31 {
>	static String CanDragKey = "Can Drag";
>	static String CanDropKey = "Can Drop";
>	
>	static Tracker tracker = null;
>
>	static class DragManager {
>		private Display display;
>		private Shell dndShell;
>		private Shell dragShell;
>		
>		Control dragCtrl;
>		int offsetX;
>		int offsetY;
>		
>		Composite dropCandidate = null;
>		private Point downPoint = null;
>		
>		Listener moveListener = new Listener() {
>			@Override
>			public void handleEvent(Event event) {
>				if (downPoint == null || dragCtrl == null)
>					return;
>				
>				int dx = event.x - downPoint.x;
>				int dy = event.y - downPoint.y;
>				if (dx > 5 || dx < -5 || dy > 5 || dy < 5) {
>					doDrag(dragCtrl, 10, 10);
>				}
>			}
>		};
>		
>		Listener buttonListener = new Listener() {
>			@Override
>			public void handleEvent(Event event) {
>				if (event.type == SWT.MouseDown) {
>					downPoint = new Point(event.x, event.y);
>					dragCtrl = getDragControl();
>				} else if (event.type == SWT.MouseUp) {
>					downPoint = null;
>					dragCtrl = null;
>				}
>			}
>		};
>		private Composite dragParent;
>		
>		public DragManager(Shell shell) {
>			dndShell = shell;
>			display = shell.getDisplay();
>			
>			display.addFilter(SWT.MouseMove, moveListener);
>			display.addFilter(SWT.MouseDown, buttonListener);
>			display.addFilter(SWT.MouseUp, buttonListener);
>		}
>		
>		public void dispose() {
>			dndShell.getDisplay().removeListener(SWT.MouseMove, moveListener);
>			dndShell.getDisplay().removeListener(SWT.MouseDown, buttonListener);
>			dndShell.getDisplay().removeListener(SWT.MouseUp, buttonListener);
>		}
>		
>		protected Control getDragControl() {
>			Control ctrl = dndShell.getDisplay().getCursorControl();
>			if (ctrl == null)
>				return null;
>			
>			Boolean canDrag = (Boolean) ctrl.getData(CanDragKey);
>			if (canDrag != null && canDrag.booleanValue())
>				return ctrl;
>			
>			return null;
>		}
>
>		public boolean doDrag(Control dragCtrl, final int offsetX, final int offsetY) {
>			dragParent = dragCtrl.getParent();
>			dndShell.setCapture(true);
>			
>			dragShell = new Shell(dndShell, SWT.NO_TRIM);
>			dragShell.setAlpha(140);
>			
>			dragCtrl.setParent(dragShell);
>			dragParent.layout();
>			dragParent.update();
>			dragCtrl.setLocation(0,0);
>			
>			Point curPos = display.getCursorLocation();
>			dragShell.setLocation(curPos.x-offsetX, curPos.y-offsetY);
>			dragShell.setSize(dragCtrl.getSize());
>			Region rgn = new Region();
>			rgn.add(dragShell.getClientArea());
>			rgn.subtract(offsetX,offsetY,1,1);
>			dragShell.setRegion(rgn);
>			dragShell.open();
>
>			tracker = new Tracker(display, SWT.NONE);			
>			tracker.addListener(SWT.Move, new Listener() {
>				Color curDropColor = null;
>				
>				@Override
>				public void handleEvent(Event event) {
>					switch (event.type) {
>					case SWT.Move:
>						dragShell.setLocation(event.x-offsetX, event.y-offsetY);
>						dropCandidate = getDropControl();
>						if (dropCandidate != null)
>							dndShell.setCursor(display.getSystemCursor(SWT.CURSOR_HAND));
>						else
>							dndShell.setCursor(display.getSystemCursor(SWT.CURSOR_NO));
>						break;
>					}
>				}
>
>				private Composite getDropControl() {
>					Control dropCandidate = display.getCursorControl();
>					if (dropCandidate == null || !(dropCandidate instanceof Composite))
>						return null;
>					
>					Boolean canDrag = (Boolean) dropCandidate.getData(CanDropKey);
>					if (canDrag != null && canDrag.booleanValue())
>						return (Composite) dropCandidate;
>					
>					return null;
>				}
>			});
>			
>			boolean result = tracker.open();
>			
>			if (result && dropCandidate != null) {
>				dragCtrl.setParent(dropCandidate);
>				dropCandidate.layout();
>			} else {
>				dragCtrl.setParent(dragParent);
>				dragParent.layout();
>			}
>			
>			dndShell.setCapture(false);
>
>			tracker.dispose();
>			downPoint = null;
>			dragCtrl = null;
>			dragShell.dispose();
>			
>			dndShell.setCursor(null);
>			
>			return result;
>		}
>	}
>	
>	private static void fillShell(Shell newShell, String prefix) {
>		Composite comp = new Composite(newShell, SWT.BORDER);
>		comp.setLayout(new RowLayout(SWT.VERTICAL));
>		comp.setData(CanDropKey, true);
>		comp.setBounds(10,10,150,150);
>		Button b = new Button(comp, SWT.PUSH);
>		b.setText(prefix + ": AAAA");
>		b.setLocation(10,10);
>		b.setSize(b.computeSize(SWT.DEFAULT, SWT.DEFAULT));
>		b.setData(CanDragKey, true);
>		
>		comp = new Composite(newShell, SWT.BORDER);
>		comp.setLayout(new RowLayout(SWT.VERTICAL));
>		comp.setData(CanDropKey, true);
>		comp.setBounds(160,10,150,150);
>		b = new Button(comp, SWT.PUSH);
>		b.setText(prefix + ": BBBB");
>		b.setLocation(10,10);
>		b.setSize(b.computeSize(SWT.DEFAULT, SWT.DEFAULT));
>		b.setData(CanDragKey, true);
>
>		comp = new Composite(newShell, SWT.BORDER);
>		comp.setLayout(new RowLayout(SWT.VERTICAL));
>		comp.setData(CanDropKey, true);
>		comp.setBounds(10,160,150,150);
>		b = new Button(comp, SWT.PUSH);
>		b.setText(prefix + ": CCCC");
>		b.setLocation(10,10);
>		b.setSize(b.computeSize(SWT.DEFAULT, SWT.DEFAULT));
>		b.setData(CanDragKey, true);
>
>		comp = new Composite(newShell, SWT.BORDER);
>		comp.setLayout(new RowLayout(SWT.VERTICAL));
>		comp.setData(CanDropKey, true);
>		comp.setBounds(160,160,150,150);
>		final ProgressBar p = new ProgressBar(comp, SWT.SMOOTH | SWT.HORIZONTAL);
>		p.setLocation(10,10);
>		p.setSize(120, 20);
>		p.setMinimum(0);
>		p.setMaximum(100);
>		p.setSelection(30);
>		p.setData(CanDragKey, true);
>
>		Runnable timer = new Runnable() {
>			int value = 0;
>			@Override
>			public void run() {
>				if (!Display.getCurrent().isDisposed()) {
>					if (!p.isDisposed())
>						p.setSelection(value);
>					value += 10;
>					if (value > 100)
>						value = 0;
>					Display.getCurrent().timerExec(100, this);
>				}
>			}
>		};
>		
>		newShell.getDisplay().timerExec(100, timer);
>	}
>	
>	
>	public static void main(String[] args) {
>		final Display display = new Display();
>		final Shell shell = new Shell(display);
>		shell.setSize(400,400);
>		fillShell(shell, "Main");
>
>		final DragManager dndManager = new DragManager(shell);
>		
>		shell.open();
>		while (!shell.isDisposed()) {
>			if (!display.readAndDispatch())
>				display.sleep();
>		}
>		display.dispose();
>	}
>}

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Attachments on bug 327893: 180959 | 185075