Refactor SwipeTracker to top level class

Bug: 2910379
Change-Id: If0ef09d8b0e7ca1c62b4c5a31bcaa620664868f2

2 files changed, 133 insertions, 110 deletions

diff --git a/java/src/com/android/inputmethod/latin/LatinKeyboardBaseView.java b/java/src/com/android/inputmethod/latin/LatinKeyboardBaseView.java
index 9169630eb..433705995 100644
--- a/java/src/com/android/inputmethod/latin/LatinKeyboardBaseView.java
+++ b/java/src/com/android/inputmethod/latin/LatinKeyboardBaseView.java
@@ -1532,114 +1532,4 @@ public class LatinKeyboardBaseView extends View implements View.OnClickListener
             resetMultiTap();
         }
     }
-
-    private static class SwipeTracker {
-
-        static final int NUM_PAST = 4;
-        static final int LONGEST_PAST_TIME = 200;
-
-        final float mPastX[] = new float[NUM_PAST];
-        final float mPastY[] = new float[NUM_PAST];
-        final long mPastTime[] = new long[NUM_PAST];
-
-        float mYVelocity;
-        float mXVelocity;
-
-        public void clear() {
-            mPastTime[0] = 0;
-        }
-
-        public void addMovement(MotionEvent ev) {
-            long time = ev.getEventTime();
-            final int N = ev.getHistorySize();
-            for (int i=0; i<N; i++) {
-                addPoint(ev.getHistoricalX(i), ev.getHistoricalY(i),
-                        ev.getHistoricalEventTime(i));
-            }
-            addPoint(ev.getX(), ev.getY(), time);
-        }
-
-        private void addPoint(float x, float y, long time) {
-            int drop = -1;
-            int i;
-            final long[] pastTime = mPastTime;
-            for (i=0; i<NUM_PAST; i++) {
-                if (pastTime[i] == 0) {
-                    break;
-                } else if (pastTime[i] < time-LONGEST_PAST_TIME) {
-                    drop = i;
-                }
-            }
-            if (i == NUM_PAST && drop < 0) {
-                drop = 0;
-            }
-            if (drop == i) drop--;
-            final float[] pastX = mPastX;
-            final float[] pastY = mPastY;
-            if (drop >= 0) {
-                final int start = drop+1;
-                final int count = NUM_PAST-drop-1;
-                System.arraycopy(pastX, start, pastX, 0, count);
-                System.arraycopy(pastY, start, pastY, 0, count);
-                System.arraycopy(pastTime, start, pastTime, 0, count);
-                i -= (drop+1);
-            }
-            pastX[i] = x;
-            pastY[i] = y;
-            pastTime[i] = time;
-            i++;
-            if (i < NUM_PAST) {
-                pastTime[i] = 0;
-            }
-        }
-
-        public void computeCurrentVelocity(int units) {
-            computeCurrentVelocity(units, Float.MAX_VALUE);
-        }
-
-        public void computeCurrentVelocity(int units, float maxVelocity) {
-            final float[] pastX = mPastX;
-            final float[] pastY = mPastY;
-            final long[] pastTime = mPastTime;
-
-            final float oldestX = pastX[0];
-            final float oldestY = pastY[0];
-            final long oldestTime = pastTime[0];
-            float accumX = 0;
-            float accumY = 0;
-            int N=0;
-            while (N < NUM_PAST) {
-                if (pastTime[N] == 0) {
-                    break;
-                }
-                N++;
-            }
-
-            for (int i=1; i < N; i++) {
-                final int dur = (int)(pastTime[i] - oldestTime);
-                if (dur == 0) continue;
-                float dist = pastX[i] - oldestX;
-                float vel = (dist/dur) * units;   // pixels/frame.
-                if (accumX == 0) accumX = vel;
-                else accumX = (accumX + vel) * .5f;
-
-                dist = pastY[i] - oldestY;
-                vel = (dist/dur) * units;   // pixels/frame.
-                if (accumY == 0) accumY = vel;
-                else accumY = (accumY + vel) * .5f;
-            }
-            mXVelocity = accumX < 0.0f ? Math.max(accumX, -maxVelocity)
-                    : Math.min(accumX, maxVelocity);
-            mYVelocity = accumY < 0.0f ? Math.max(accumY, -maxVelocity)
-                    : Math.min(accumY, maxVelocity);
-        }
-
-        public float getXVelocity() {
-            return mXVelocity;
-        }
-
-        public float getYVelocity() {
-            return mYVelocity;
-        }
-    }
 }
diff --git a/java/src/com/android/inputmethod/latin/SwipeTracker.java b/java/src/com/android/inputmethod/latin/SwipeTracker.java
new file mode 100644
index 000000000..007c8e7a4
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/SwipeTracker.java
@@ -0,0 +1,133 @@
+/*
+ * 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.latin;
+
+import android.view.MotionEvent;
+
+class SwipeTracker {
+
+    static final int NUM_PAST = 4;
+    static final int LONGEST_PAST_TIME = 200;
+
+    final float mPastX[] = new float[NUM_PAST];
+    final float mPastY[] = new float[NUM_PAST];
+    final long mPastTime[] = new long[NUM_PAST];
+
+    float mYVelocity;
+    float mXVelocity;
+
+    public void clear() {
+        mPastTime[0] = 0;
+    }
+
+    public void addMovement(MotionEvent ev) {
+        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
+            clear();
+            return;
+        }
+        long time = ev.getEventTime();
+        final int N = ev.getHistorySize();
+        for (int i=0; i<N; i++) {
+            addPoint(ev.getHistoricalX(i), ev.getHistoricalY(i),
+                    ev.getHistoricalEventTime(i));
+        }
+        addPoint(ev.getX(), ev.getY(), time);
+    }
+
+    private void addPoint(float x, float y, long time) {
+        int drop = -1;
+        int i;
+        final long[] pastTime = mPastTime;
+        for (i=0; i<NUM_PAST; i++) {
+            if (pastTime[i] == 0) {
+                break;
+            } else if (pastTime[i] < time-LONGEST_PAST_TIME) {
+                drop = i;
+            }
+        }
+        if (i == NUM_PAST && drop < 0) {
+            drop = 0;
+        }
+        if (drop == i) drop--;
+        final float[] pastX = mPastX;
+        final float[] pastY = mPastY;
+        if (drop >= 0) {
+            final int start = drop+1;
+            final int count = NUM_PAST-drop-1;
+            System.arraycopy(pastX, start, pastX, 0, count);
+            System.arraycopy(pastY, start, pastY, 0, count);
+            System.arraycopy(pastTime, start, pastTime, 0, count);
+            i -= (drop+1);
+        }
+        pastX[i] = x;
+        pastY[i] = y;
+        pastTime[i] = time;
+        i++;
+        if (i < NUM_PAST) {
+            pastTime[i] = 0;
+        }
+    }
+
+    public void computeCurrentVelocity(int units) {
+        computeCurrentVelocity(units, Float.MAX_VALUE);
+    }
+
+    public void computeCurrentVelocity(int units, float maxVelocity) {
+        final float[] pastX = mPastX;
+        final float[] pastY = mPastY;
+        final long[] pastTime = mPastTime;
+
+        final float oldestX = pastX[0];
+        final float oldestY = pastY[0];
+        final long oldestTime = pastTime[0];
+        float accumX = 0;
+        float accumY = 0;
+        int N=0;
+        while (N < NUM_PAST) {
+            if (pastTime[N] == 0) {
+                break;
+            }
+            N++;
+        }
+
+        for (int i=1; i < N; i++) {
+            final int dur = (int)(pastTime[i] - oldestTime);
+            if (dur == 0) continue;
+            float dist = pastX[i] - oldestX;
+            float vel = (dist/dur) * units;   // pixels/frame.
+            if (accumX == 0) accumX = vel;
+            else accumX = (accumX + vel) * .5f;
+
+            dist = pastY[i] - oldestY;
+            vel = (dist/dur) * units;   // pixels/frame.
+            if (accumY == 0) accumY = vel;
+            else accumY = (accumY + vel) * .5f;
+        }
+        mXVelocity = accumX < 0.0f ? Math.max(accumX, -maxVelocity)
+                : Math.min(accumX, maxVelocity);
+        mYVelocity = accumY < 0.0f ? Math.max(accumY, -maxVelocity)
+                : Math.min(accumY, maxVelocity);
+    }
+
+    public float getXVelocity() {
+        return mXVelocity;
+    }
+
+    public float getYVelocity() {
+        return mYVelocity;
+    }
+}
\ No newline at end of file