1 files changed, 75 insertions, 0 deletions
diff --git a/java/src/com/android/inputmethod/keyboard/ProximityKeyDetector.java b/java/src/com/android/inputmethod/keyboard/ProximityKeyDetector.java
new file mode 100644
index 000000000..047173445
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/ProximityKeyDetector.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2010 Google Inc.
+ *
+ * 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.inputmethod.keyboard;
+
+import java.util.Arrays;
+
+public class ProximityKeyDetector extends KeyDetector {
+    private static final int MAX_NEARBY_KEYS = 12;
+
+    // working area
+    private int[] mDistances = new int[MAX_NEARBY_KEYS];
+
+    @Override
+    protected int getMaxNearbyKeys() {
+        return MAX_NEARBY_KEYS;
+    }
+
+    @Override
+    public int getKeyIndexAndNearbyCodes(int x, int y, int[] allKeys) {
+        final Key[] keys = getKeys();
+        final int touchX = getTouchX(x);
+        final int touchY = getTouchY(y);
+
+        int primaryIndex = NOT_A_KEY;
+        int closestKeyIndex = NOT_A_KEY;
+        int closestKeyDist = mProximityThresholdSquare + 1;
+        final int[] distances = mDistances;
+        Arrays.fill(distances, Integer.MAX_VALUE);
+        for (final int index : mKeyboard.getNearestKeys(touchX, touchY)) {
+            final Key key = keys[index];
+            final boolean isInside = key.isInside(touchX, touchY);
+            if (isInside)
+                primaryIndex = index;
+            final int dist = key.squaredDistanceToEdge(touchX, touchY);
+            if (isInside || (mProximityCorrectOn && dist < mProximityThresholdSquare)) {
+                if (dist < closestKeyDist) {
+                    closestKeyDist = dist;
+                    closestKeyIndex = index;
+                }
+
+                if (allKeys == null) continue;
+                final int nCodes = key.codes.length;
+                // Find insertion point
+                for (int j = 0; j < distances.length; j++) {
+                    if (distances[j] > dist) {
+                        // Make space for nCodes codes
+                        System.arraycopy(distances, j, distances, j + nCodes,
+                                distances.length - (j + nCodes));
+                        System.arraycopy(allKeys, j, allKeys, j + nCodes,
+                                allKeys.length - (j + nCodes));
+                        System.arraycopy(key.codes, 0, allKeys, j, nCodes);
+                        Arrays.fill(distances, j, j + nCodes, dist);
+                        break;
+                    }
+                }
+            }
+        }
+
+        return primaryIndex == NOT_A_KEY ? closestKeyIndex : primaryIndex;
+    }
+}