1 files changed, 93 insertions, 0 deletions
diff --git a/java/com/android/contacts/common/format/TextHighlighter.java b/java/com/android/contacts/common/format/TextHighlighter.java
new file mode 100644
index 000000000..30c03fdf3
--- /dev/null
+++ b/java/com/android/contacts/common/format/TextHighlighter.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.contacts.common.format;
+
+import android.text.SpannableString;
+import android.text.style.CharacterStyle;
+import android.text.style.StyleSpan;
+import android.widget.TextView;
+
+/** Highlights the text in a text field. */
+public class TextHighlighter {
+
+  private static final boolean DEBUG = false;
+  private final String TAG = TextHighlighter.class.getSimpleName();
+  private int mTextStyle;
+
+  private CharacterStyle mTextStyleSpan;
+
+  public TextHighlighter(int textStyle) {
+    mTextStyle = textStyle;
+    mTextStyleSpan = getStyleSpan();
+  }
+
+  /**
+   * Sets the text on the given text view, highlighting the word that matches the given prefix.
+   *
+   * @param view the view on which to set the text
+   * @param text the string to use as the text
+   * @param prefix the prefix to look for
+   */
+  public void setPrefixText(TextView view, String text, String prefix) {
+    view.setText(applyPrefixHighlight(text, prefix));
+  }
+
+  private CharacterStyle getStyleSpan() {
+    return new StyleSpan(mTextStyle);
+  }
+
+  /**
+   * Applies highlight span to the text.
+   *
+   * @param text Text sequence to be highlighted.
+   * @param start Start position of the highlight sequence.
+   * @param end End position of the highlight sequence.
+   */
+  public void applyMaskingHighlight(SpannableString text, int start, int end) {
+    /** Sets text color of the masked locations to be highlighted. */
+    text.setSpan(getStyleSpan(), start, end, 0);
+  }
+
+  /**
+   * Returns a CharSequence which highlights the given prefix if found in the given text.
+   *
+   * @param text the text to which to apply the highlight
+   * @param prefix the prefix to look for
+   */
+  public CharSequence applyPrefixHighlight(CharSequence text, String prefix) {
+    if (prefix == null) {
+      return text;
+    }
+
+    // Skip non-word characters at the beginning of prefix.
+    int prefixStart = 0;
+    while (prefixStart < prefix.length()
+        && !Character.isLetterOrDigit(prefix.charAt(prefixStart))) {
+      prefixStart++;
+    }
+    final String trimmedPrefix = prefix.substring(prefixStart);
+
+    int index = FormatUtils.indexOfWordPrefix(text, trimmedPrefix);
+    if (index != -1) {
+      final SpannableString result = new SpannableString(text);
+      result.setSpan(mTextStyleSpan, index, index + trimmedPrefix.length(), 0 /* flags */);
+      return result;
+    } else {
+      return text;
+    }
+  }
+}