+ /**
+ * Returns the proportion of its range that a scrollbar's position represents,
+ * as a value between 0 and 1. For example if the whole range is from 0 to
+ * 200, then a position of 40 gives proportion = 0.2.
+ *
+ * @see http://www.javalobby.org/java/forums/t33050.html#91885334
+ *
+ * @param scroll
+ * @return
+ */
+ public static float getScrollBarProportion(JScrollBar scroll)
+ {
+ /*
+ * The extent (scroll handle width) deduction gives the true operating range
+ * of possible positions.
+ */
+ int possibleRange = scroll.getMaximum() - scroll.getMinimum()
+ - scroll.getModel().getExtent();
+ float valueInRange = scroll.getValue()
+ - (scroll.getModel().getExtent() / 2f);
+ float proportion = valueInRange / possibleRange;
+ return proportion;
+ }
+
+ /**
+ * Returns the scroll bar position in its range that would match the given
+ * proportion (between 0 and 1) of the whole. For example if the whole range
+ * is from 0 to 200, then a proportion of 0.25 gives position 50.
+ *
+ * @param scrollbar
+ * @param proportion
+ * @return
+ */
+ public static int getScrollValueForProportion(JScrollBar scrollbar,
+ float proportion)
+ {
+ /*
+ * The extent (scroll handle width) deduction gives the true operating range
+ * of possible positions.
+ */
+ float fraction = proportion
+ * (scrollbar.getMaximum() - scrollbar.getMinimum() - scrollbar
+ .getModel().getExtent())
+ + (scrollbar.getModel().getExtent() / 2f);
+ return Math.min(Math.round(fraction), scrollbar.getMaximum());
+ }
+
+ public static void jvInitComponent(AbstractButton comp, String i18nString)
+ {
+ setColorAndFont(comp);
+ if (i18nString != null && !i18nString.isEmpty())
+ {
+ comp.setText(MessageManager.getString(i18nString));
+ }
+ }
+
+ public static void jvInitComponent(JComponent comp)
+ {
+ setColorAndFont(comp);
+ }
+
+ private static void setColorAndFont(JComponent comp)
+ {
+ comp.setBackground(Color.white);
+ comp.setFont(JvSwingUtils.getLabelFont());
+ }
+