java - How to track mouse over SWT composite made from sub controls? -


i have created own control:

screenshot of composite

i want track mouse , added mousetracklistener. unfortunately mouseenter , mouseleave events generated, when mouse moves on parts of composite (that label , button).

enter image description here

[mouse enter] - mouse enters empty space [mouse hover] - mouse on empty space [mouse exit]  - mouse moved on label [mouse enter] - mouse leaves label , enters empty space [mouse hover] - mouse on empty space [mouse exit]  - mouse leaves composite

how can track composite 1 complete thing instead of sub parts?

public class mycomposite extends composite {     public mycomposite(final composite parent, final int style) {         super(parent, style);          final label lbl = new label(this, swt.none);         lbl.setbounds(10, 10, 78, 15);         lbl.settext("my composite");          final button btn = new button(this, swt.none);         btn.setbounds(190, 29, 75, 25);         btn.settext("ok");          pack();     }      public static void main(final string[] args) {         final shell shell = new shell(display.getdefault());         shell.settext("testcase");         shell.setlayout(new filllayout());          final mycomposite comp = new mycomposite(shell, swt.none);         comp.addmousetracklistener(new mousetracklistener() {             @override             public void mousehover(final mouseevent e) {                 system.out.println("[mouse hover]");             }              @override             public void mouseexit(final mouseevent e) {                 system.out.println("[mouse exit]");             }              @override             public void mouseenter(final mouseevent e) {                 system.out.println("[mouse enter]");             }         });          shell.open();         while (!shell.isdisposed()) {             if (!display.readanddispatch())                 display.sleep();         }     } }

if want mouse move events can add untyped event composite. should 

final composite comp = new composite(shell, org.eclipse.swt.swt.none); comp.addlistener(swt.mousemove, new listener() {     public void handleevent(event event) {         system.out.println("hit");     } });

if add same listener instance children of mycomposite can capture mouse move events.

alternately can use display.addfilter catch mouse events , filter if ones happen on composite instance or of children.

a third option use composite.setcapture mouse events when mouse enters composite area , stop capturing when leaves.

out of these think first option best performant.


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