public ImageViewer(Composite parent, int style) {
super(parent, style);
GridLayout gl = new GridLayout(1, false);
gl.horizontalSpacing = 0;
gl.verticalSpacing = 0;
gl.marginHeight = 0;
gl.marginWidth = 0;
setLayout(gl);
canvas = new ImageViewCanvas(this, SWT.NONE);
canvas.setLayoutData(new GridData(GridData.FILL_BOTH));
// Add DND support
Transfer[] types = new Transfer[] {ImageTransfer.getInstance()};
int operations = DND.DROP_COPY;
final DragSource source = new DragSource(canvas, operations);
source.setTransfer(types);
source.addDragListener(
new DragSourceListener() {
@Override
public void dragStart(DragSourceEvent event) {}
@Override
public void dragSetData(DragSourceEvent event) {
if (canvas.getImageData() != null) {
event.data = canvas.getImageData();
} else {
event.data = null;
}
}
@Override
public void dragFinished(DragSourceEvent event) {}
});
}
public SWTException getLastError() {
return canvas.getError();
}
public boolean clearImage() {
canvas.loadImage(null);
return true;
}
public boolean loadImage(InputStream inputStream) {
canvas.loadImage(inputStream);
return canvas.getError() == null;
}