/**
* Measure the text, stopping early if the measured width exceeds maxWidth. Return the number of
* chars that were measured, and if measuredWidth is not null, return in it the actual width
* measured.
*
* @param text The text to measure
* @param start The offset into text to begin measuring at
* @param end The end of the text slice to measure.
* @param measureForwards If true, measure forwards, starting at start. Otherwise, measure
* backwards, starting with end.
* @param maxWidth The maximum width to accumulate.
* @param measuredWidth Optional. If not null, returns the actual width measured.
* @return The number of chars that were measured. Will always be <= abs(end - start).
*/
public int breakText(
CharSequence text,
int start,
int end,
boolean measureForwards,
float maxWidth,
float[] measuredWidth) {
if (start == 0 && text instanceof String && end == text.length()) {
return breakText((String) text, measureForwards, maxWidth, measuredWidth);
}
char[] buf = TemporaryBuffer.obtain(end - start);
int result;
TextUtils.getChars(text, start, end, buf, 0);
if (measureForwards) {
result = breakText(buf, 0, end - start, maxWidth, measuredWidth);
} else {
result = breakText(buf, 0, -(end - start), maxWidth, measuredWidth);
}
TemporaryBuffer.recycle(buf);
return result;
}
/**
* Return the width of the text.
*
* @param text The text to measure
* @param start The index of the first character to start measuring
* @param end 1 beyond the index of the last character to measure
* @return The width of the text
*/
public float measureText(CharSequence text, int start, int end) {
if (text instanceof String) {
return measureText((String) text, start, end);
}
if (text instanceof SpannedString || text instanceof SpannableString) {
return measureText(text.toString(), start, end);
}
if (text instanceof GraphicsOperations) {
return ((GraphicsOperations) text).measureText(start, end, this);
}
char[] buf = TemporaryBuffer.obtain(end - start);
TextUtils.getChars(text, start, end, buf, 0);
float result = measureText(buf, 0, end - start);
TemporaryBuffer.recycle(buf);
return result;
}
/**
* Return the advance widths for the characters in the string.
*
* @param text The text to measure
* @param start The index of the first char to to measure
* @param end The end of the text slice to measure
* @param widths array to receive the advance widths of the characters. Must be at least a large
* as (end - start).
* @return the actual number of widths returned.
*/
public int getTextWidths(CharSequence text, int start, int end, float[] widths) {
if (text instanceof String) {
return getTextWidths((String) text, start, end, widths);
}
if (text instanceof SpannedString || text instanceof SpannableString) {
return getTextWidths(text.toString(), start, end, widths);
}
if (text instanceof GraphicsOperations) {
return ((GraphicsOperations) text).getTextWidths(start, end, widths, this);
}
char[] buf = TemporaryBuffer.obtain(end - start);
TextUtils.getChars(text, start, end, buf, 0);
int result = getTextWidths(buf, 0, end - start, widths);
TemporaryBuffer.recycle(buf);
return result;
}
