/**
* Shorten the given text <code>t</code> so that its length doesn't exceed the given width. The
* default implementation replaces characters in the center of the original string with an
* ellipsis ("..."). Override if you need a different strategy.
*
* @param gc the gc to use for text measurement
* @param t the text to shorten
* @param width the width to shorten the text to, in pixels
* @return the shortened text
*/
protected String shortenText(GC gc, String t, int width) {
if (t == null) return null;
int w = gc.textExtent(ELLIPSIS, DRAW_FLAGS).x;
if (width <= w) return t;
int l = t.length();
int max = l / 2;
int min = 0;
int mid = (max + min) / 2 - 1;
if (mid <= 0) return t;
TextLayout layout = new TextLayout(getDisplay());
layout.setText(t);
mid = validateOffset(layout, mid);
while (min < mid && mid < max) {
String s1 = t.substring(0, mid);
String s2 = t.substring(validateOffset(layout, l - mid), l);
int l1 = gc.textExtent(s1, DRAW_FLAGS).x;
int l2 = gc.textExtent(s2, DRAW_FLAGS).x;
if (l1 + w + l2 > width) {
max = mid;
mid = validateOffset(layout, (max + min) / 2);
} else if (l1 + w + l2 < width) {
min = mid;
mid = validateOffset(layout, (max + min) / 2);
} else {
min = max;
}
}
String result =
mid == 0
? t
: t.substring(0, mid) + ELLIPSIS + t.substring(validateOffset(layout, l - mid), l);
layout.dispose();
return result;
}
void releaseWidget() {
super.releaseWidget();
if (layout != null) layout.dispose();
layout = null;
if (linkColor != null) linkColor.dispose();
linkColor = null;
disabledColor = null;
offsets = null;
ids = null;
mnemonics = null;
text = null;
}