LayoutLib: Use ICU's line break algo.

Change-Id: I7e5b0ab7423a72f5a4b0e1163d0a537f0b03ba07

1 files changed, 55 insertions, 0 deletions

diff --git a/tools/layoutlib/bridge/src/android/text/StaticLayout_Delegate.java b/tools/layoutlib/bridge/src/android/text/StaticLayout_Delegate.java
new file mode 100644
index 0000000..5a467b2
--- /dev/null
+++ b/tools/layoutlib/bridge/src/android/text/StaticLayout_Delegate.java
@@ -0,0 +1,55 @@
+package android.text;
+
+import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
+
+import java.text.CharacterIterator;
+import java.util.Arrays;
+import java.util.Locale;
+
+import com.ibm.icu.lang.UCharacter;
+import com.ibm.icu.text.BreakIterator;
+import com.ibm.icu.util.ULocale;
+import javax.swing.text.Segment;
+
+/**
+ * Delegate that provides implementation for native methods in {@link android.text.StaticLayout}
+ *
+ * Through the layoutlib_create tool, selected methods of Handler have been replaced
+ * by calls to methods of the same name in this delegate class.
+ *
+ */
+public class StaticLayout_Delegate {
+
+    /**
+     * Fills the recycle array with positions that are suitable to break the text at. The array
+     * must be terminated by '-1'.
+     */
+    @LayoutlibDelegate
+    /*package*/ static int[] nLineBreakOpportunities(String locale, char[] text, int length,
+            int[] recycle) {
+        BreakIterator iterator = BreakIterator.getLineInstance(new ULocale(locale));
+        Segment segment = new Segment(text, 0, length);
+        iterator.setText(segment);
+        if (recycle == null) {
+            // Because 42 is the answer to everything.
+            recycle = new int[42];
+        }
+        int breakOpp = iterator.first();
+        recycle[0] = breakOpp;
+        //noinspection ConstantConditions
+        assert BreakIterator.DONE == -1;
+        for (int i = 1; breakOpp != BreakIterator.DONE; ++i) {
+            if (i >= recycle.length) {
+                recycle = doubleSize(recycle);
+            }
+            assert (i < recycle.length);
+            breakOpp = iterator.next();
+            recycle[i] = breakOpp;
+        }
+        return recycle;
+    }
+
+    private static int[] doubleSize(int[] array) {
+        return Arrays.copyOf(array, array.length * 2);
+    }
+}