void updateBar(int selection, int minimum, int maximum, int thumb) {
NSScroller widget = (NSScroller) view;
selection = Math.max(minimum, Math.min(maximum - thumb, selection));
float fraction =
minimum == maximum ? 1 : (float) (selection - minimum) / (maximum - thumb - minimum);
float knob = minimum == maximum ? 1 : (float) (thumb - minimum) / (maximum - minimum);
widget.setFloatValue(fraction, knob);
}
public Point computeSize(int wHint, int hHint, boolean changed) {
checkWidget();
int width = 0, height = 0;
if ((style & SWT.HORIZONTAL) != 0) {
height = (int) NSScroller.scrollerWidth();
width = height * 10;
} else {
width = (int) NSScroller.scrollerWidth();
height = width * 10;
}
if (wHint != SWT.DEFAULT) width = wHint;
if (hHint != SWT.DEFAULT) height = hHint;
return new Point(width, height);
}
void createHandle() {
NSScroller widget = (NSScroller) new SWTScroller().alloc();
NSRect rect = new NSRect();
if ((style & SWT.HORIZONTAL) != 0) {
rect.width = 1;
} else {
rect.height = 1;
}
widget.initWithFrame(rect);
widget.setEnabled(true);
widget.setTarget(widget);
widget.setAction(OS.sel_sendSelection);
widget.setTag(jniRef);
view = widget;
parent.contentView().addSubview_(widget);
updateBar(0, minimum, maximum, thumb);
}
/**
* Returns the 'selection', which is the receiver's value.
*
* @return the selection
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
* </ul>
*/
public int getSelection() {
checkWidget();
NSScroller widget = (NSScroller) view;
float value = widget.floatValue();
return (int) ((maximum - thumb - minimum) * value + minimum);
}