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| class MyCanvas extends Canvas {
private final List<Marker> markers;
public MyCanvas(Composite parent, int style) {
super(parent, style);
markers = new ArrayList<>();
addPaintListener(new PaintListener() {
@Override
public void paintControl(PaintEvent e) {
Point size = getSize();
for(Marker marker : markers) {
marker.draw(e.gc, 0, 0, size.x, size.y);
}
}
});
}
public void addMarker(Marker marker) {
checkWidget();
if ( !markers.contains( marker ) ) {
markers.add(marker);
redraw();
}
}
public void removeMarker(Marker marker) {
checkWidget();
if ( markers.remove(marker) ) {
redraw();
}
}
} |
