diff options
Diffstat (limited to 'src/com/android/calculator2/CalculatorText.java')
-rw-r--r-- | src/com/android/calculator2/CalculatorText.java | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/com/android/calculator2/CalculatorText.java b/src/com/android/calculator2/CalculatorText.java index b0bbb7c..4b0b0c9 100644 --- a/src/com/android/calculator2/CalculatorText.java +++ b/src/com/android/calculator2/CalculatorText.java @@ -204,6 +204,39 @@ public class CalculatorText extends AlignedTextView implements View.OnLongClickL return lastFitTextSize; } + private static boolean startsWith(CharSequence whole, CharSequence prefix) { + int wholeLen = whole.length(); + int prefixLen = prefix.length(); + if (prefixLen > wholeLen) { + return false; + } + for (int i = 0; i < prefixLen; ++i) { + if (prefix.charAt(i) != whole.charAt(i)) { + return false; + } + } + return true; + } + + /** + * Functionally equivalent to setText(), but explicitly announce changes. + * If the new text is an extension of the old one, announce the addition. + * Otherwise, e.g. after deletion, announce the entire new text. + */ + public void changeTextTo(CharSequence newText) { + CharSequence oldText = getText(); + if (startsWith(newText, oldText)) { + int newLen = newText.length(); + int oldLen = oldText.length(); + if (oldLen != newLen) { + announceForAccessibility(newText.subSequence(oldLen, newLen)); + } + } else { + announceForAccessibility(newText); + } + setText(newText); + } + public boolean stopActionMode() { if (mActionMode != null) { mActionMode.finish(); |