am 37598210: Move PointerTracker.DrawingProxy to MainKeyboardView (step 2)

* commit '375982106bf073971fccd14b2c65ec8e089bb2ae':
  Move PointerTracker.DrawingProxy to MainKeyboardView (step 2)

java/res/values/attrs.xml

@@ -51,8 +51,6 @@
         <!-- Blur radius of key text shadow. -->
         <attr name="keyTextShadowRadius" format="float" />
 
-        <!-- Layout resource for key press feedback.-->
-        <attr name="keyPreviewLayout" format="reference" />
         <!-- Key preview background states -->
         <attr name="state_left_edge" format="boolean" />
         <attr name="state_right_edge" format="boolean" />
@@ -71,8 +69,6 @@
         <attr name="gestureFloatingPreviewHorizontalPadding" format="dimension" />
         <attr name="gestureFloatingPreviewVerticalPadding" format="dimension" />
         <attr name="gestureFloatingPreviewRoundRadius" format="dimension" />
-        <!-- Delay after gesture input and gesture floating preview text dismissing in millisecond -->
-        <attr name="gestureFloatingPreviewTextLingerTimeout" format="integer" />
         <!-- Delay after gesture trail starts fading out in millisecond. -->
         <attr name="gesturePreviewTrailFadeoutStartDelay" format="integer" />
         <!-- Duration while gesture preview trail is fading out in millisecond. -->
@@ -117,6 +113,8 @@
         <attr name="longPressShiftKeyTimeout" format="integer" />
         <!-- Ignore special key timeout while typing in millisecond. -->
         <attr name="ignoreAltCodeKeyTimeout" format="integer" />
+        <!-- Layout resource for key press feedback.-->
+        <attr name="keyPreviewLayout" format="reference" />
         <!-- Vertical offset of the key press feedback from the key. -->
         <attr name="keyPreviewOffset" format="dimension" />
         <!-- Height of the key press feedback popup. -->
@@ -127,6 +125,8 @@
         <attr name="moreKeysKeyboardLayout" format="reference" />
         <!-- More keys keyboard will shown at touched point. -->
         <attr name="showMoreKeysKeyboardAtTouchedPoint" format="boolean" />
+        <!-- Delay after gesture input and gesture floating preview text dismissing in millisecond -->
+        <attr name="gestureFloatingPreviewTextLingerTimeout" format="integer" />
         <!-- Static threshold for gesture after fast typing (msec) -->
         <attr name="gestureStaticTimeThresholdAfterFastTyping" format="integer" />
         <!-- Static threshold for starting gesture detection (keyWidth%/sec) -->

java/res/values/styles.xml

@@ -53,7 +53,6 @@
         <item name="keyHintLetterPadding">@dimen/key_hint_letter_padding</item>
         <item name="keyPopupHintLetterPadding">@dimen/key_popup_hint_letter_padding</item>
         <item name="keyShiftedLetterHintPadding">@dimen/key_uppercase_letter_padding</item>
-        <item name="keyPreviewLayout">@layout/key_preview</item>
         <item name="keyPreviewTextColor">@color/key_text_color_default</item>
         <item name="keyPreviewTextRatio">@fraction/key_preview_text_ratio</item>
         <item name="verticalCorrection">@dimen/keyboard_vertical_correction</item>
@@ -67,7 +66,6 @@
         <item name="gestureFloatingPreviewHorizontalPadding">@dimen/gesture_floating_preview_horizontal_padding</item>
         <item name="gestureFloatingPreviewVerticalPadding">@dimen/gesture_floating_preview_vertical_padding</item>
         <item name="gestureFloatingPreviewRoundRadius">@dimen/gesture_floating_preview_round_radius</item>
-        <item name="gestureFloatingPreviewTextLingerTimeout">@integer/config_gesture_floating_preview_text_linger_timeout</item>
         <item name="gesturePreviewTrailFadeoutStartDelay">@integer/config_gesture_preview_trail_fadeout_start_delay</item>
         <item name="gesturePreviewTrailFadeoutDuration">@integer/config_gesture_preview_trail_fadeout_duration</item>
         <item name="gesturePreviewTrailUpdateInterval">@integer/config_gesture_preview_trail_update_interval</item>
@@ -85,6 +83,7 @@
         <item name="longPressKeyTimeout">@integer/config_long_press_key_timeout</item>
         <item name="longPressShiftKeyTimeout">@integer/config_long_press_shift_key_timeout</item>
         <item name="ignoreAltCodeKeyTimeout">@integer/config_ignore_alt_code_key_timeout</item>
+        <item name="keyPreviewLayout">@layout/key_preview</item>
         <item name="keyPreviewOffset">@dimen/key_preview_offset</item>
         <item name="keyPreviewHeight">@dimen/key_preview_height</item>
         <item name="keyPreviewLingerTimeout">@integer/config_key_preview_linger_timeout</item>
@@ -95,6 +94,7 @@
         <item name="altCodeKeyWhileTypingFadeoutAnimator">@anim/alt_code_key_while_typing_fadeout</item>
         <item name="altCodeKeyWhileTypingFadeinAnimator">@anim/alt_code_key_while_typing_fadein</item>
         <!-- Common attributes of MainKeyboardView for gesture typing detection and recognition -->
+        <item name="gestureFloatingPreviewTextLingerTimeout">@integer/config_gesture_floating_preview_text_linger_timeout</item>
         <item name="gestureStaticTimeThresholdAfterFastTyping">@integer/config_gesture_static_time_threshold_after_fast_typing</item>
         <item name="gestureDetectFastMoveSpeedThreshold">@fraction/config_gesture_detect_fast_move_speed_threshold</item>
         <item name="gestureDynamicThresholdDecayDuration">@integer/config_gesture_dynamic_threshold_decay_duration</item>

java/src/com/android/inputmethod/keyboard/KeyboardView.java

@@ -28,26 +28,16 @@ import android.graphics.Rect;
 import android.graphics.Region;
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
-import android.os.Message;
 import android.util.AttributeSet;
-import android.util.DisplayMetrics;
-import android.util.Log;
 import android.util.SparseArray;
-import android.view.LayoutInflater;
 import android.view.View;
-import android.view.ViewGroup;
-import android.widget.TextView;
 
 import com.android.inputmethod.keyboard.internal.KeyDrawParams;
 import com.android.inputmethod.keyboard.internal.KeyVisualAttributes;
-import com.android.inputmethod.keyboard.internal.PreviewPlacerView;
 import com.android.inputmethod.latin.CollectionUtils;
 import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.CoordinateUtils;
 import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
-import com.android.inputmethod.latin.StaticInnerHandlerWrapper;
-import com.android.inputmethod.latin.SuggestedWords;
 import com.android.inputmethod.latin.define.ProductionFlag;
 import com.android.inputmethod.research.ResearchLogger;
 
@@ -57,26 +47,12 @@ import java.util.HashSet;
  * A view that renders a virtual {@link Keyboard}.
  *
  * @attr ref R.styleable#KeyboardView_keyBackground
- * @attr ref R.styleable#KeyboardView_keyPreviewLayout
  * @attr ref R.styleable#KeyboardView_keyLabelHorizontalPadding
  * @attr ref R.styleable#KeyboardView_keyHintLetterPadding
  * @attr ref R.styleable#KeyboardView_keyPopupHintLetterPadding
  * @attr ref R.styleable#KeyboardView_keyShiftedLetterHintPadding
  * @attr ref R.styleable#KeyboardView_keyTextShadowRadius
  * @attr ref R.styleable#KeyboardView_backgroundDimAlpha
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextSize
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextColor
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextOffset
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewColor
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewHorizontalPadding
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewVerticalPadding
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewRoundRadius
- * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextLingerTimeout
- * @attr ref R.styleable#KeyboardView_gesturePreviewTrailFadeoutStartDelay
- * @attr ref R.styleable#KeyboardView_gesturePreviewTrailFadeoutDuration
- * @attr ref R.styleable#KeyboardView_gesturePreviewTrailUpdateInterval
- * @attr ref R.styleable#KeyboardView_gesturePreviewTrailColor
- * @attr ref R.styleable#KeyboardView_gesturePreviewTrailWidth
  * @attr ref R.styleable#KeyboardView_verticalCorrection
  * @attr ref R.styleable#Keyboard_Key_keyTypeface
  * @attr ref R.styleable#Keyboard_Key_keyLetterSize
@@ -97,8 +73,6 @@ import java.util.HashSet;
  * @attr ref R.styleable#Keyboard_Key_keyPreviewTextColor
  */
 public class KeyboardView extends View {
-    private static final String TAG = KeyboardView.class.getSimpleName();
-
     // XML attributes
     protected final KeyVisualAttributes mKeyVisualAttributes;
     private final int mKeyLabelHorizontalPadding;
@@ -126,20 +100,6 @@ public class KeyboardView extends View {
     private Keyboard mKeyboard;
     protected final KeyDrawParams mKeyDrawParams = new KeyDrawParams();
 
-    // Preview placer view
-    // TODO: Move PreviewPlacerView to MainKeyboardView
-    protected final PreviewPlacerView mPreviewPlacerView;
-    private final int[] mOriginCoords = CoordinateUtils.newInstance();
-
-    // Key preview
-    // TODO: Move these variable to MainKeyboardView
-    protected final int mKeyPreviewLayoutId;
-    protected final SparseArray<TextView> mKeyPreviewTexts = CollectionUtils.newSparseArray();
-
-    // Gesture floating preview text
-    // TODO: Make this parameter customizable by user via settings.
-    private int mGestureFloatingPreviewTextLingerTimeout;
-
     // Drawing
     /** True if the entire keyboard needs to be dimmed. */
     private boolean mNeedsToDimEntireKeyboard;
@@ -164,56 +124,6 @@ public class KeyboardView extends View {
     private static final char[] KEY_LABEL_REFERENCE_CHAR = { 'M' };
     private static final char[] KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR = { '8' };
 
-    // TODO: Move this to MainKeyboardView
-    protected final DrawingHandler mDrawingHandler = new DrawingHandler(this);
-
-    public static class DrawingHandler extends StaticInnerHandlerWrapper<KeyboardView> {
-        private static final int MSG_DISMISS_KEY_PREVIEW = 0;
-        private static final int MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
-
-        public DrawingHandler(final KeyboardView outerInstance) {
-            super(outerInstance);
-        }
-
-        @Override
-        public void handleMessage(final Message msg) {
-            final KeyboardView keyboardView = getOuterInstance();
-            if (keyboardView == null) return;
-            final PointerTracker tracker = (PointerTracker) msg.obj;
-            switch (msg.what) {
-            case MSG_DISMISS_KEY_PREVIEW:
-                final TextView previewText = keyboardView.mKeyPreviewTexts.get(tracker.mPointerId);
-                if (previewText != null) {
-                    previewText.setVisibility(INVISIBLE);
-                }
-                break;
-            case MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT:
-                keyboardView.mPreviewPlacerView.setGestureFloatingPreviewText(SuggestedWords.EMPTY);
-                break;
-            }
-        }
-
-        public void dismissKeyPreview(final long delay, final PointerTracker tracker) {
-            sendMessageDelayed(obtainMessage(MSG_DISMISS_KEY_PREVIEW, tracker), delay);
-        }
-
-        public void cancelDismissKeyPreview(final PointerTracker tracker) {
-            removeMessages(MSG_DISMISS_KEY_PREVIEW, tracker);
-        }
-
-        private void cancelAllDismissKeyPreviews() {
-            removeMessages(MSG_DISMISS_KEY_PREVIEW);
-        }
-
-        public void dismissGestureFloatingPreviewText(final long delay) {
-            sendMessageDelayed(obtainMessage(MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT), delay);
-        }
-
-        public void cancelAllMessages() {
-            cancelAllDismissKeyPreviews();
-        }
-    }
-
     public KeyboardView(final Context context, final AttributeSet attrs) {
         this(context, attrs, R.attr.keyboardViewStyle);
     }
@@ -235,14 +145,10 @@ public class KeyboardView extends View {
                 R.styleable.KeyboardView_keyShiftedLetterHintPadding, 0);
         mKeyTextShadowRadius = keyboardViewAttr.getFloat(
                 R.styleable.KeyboardView_keyTextShadowRadius, 0.0f);
-        mKeyPreviewLayoutId = keyboardViewAttr.getResourceId(
-                R.styleable.KeyboardView_keyPreviewLayout, 0);
         mVerticalCorrection = keyboardViewAttr.getDimension(
                 R.styleable.KeyboardView_verticalCorrection, 0);
         mBackgroundDimAlpha = keyboardViewAttr.getInt(
                 R.styleable.KeyboardView_backgroundDimAlpha, 0);
-        mGestureFloatingPreviewTextLingerTimeout = keyboardViewAttr.getInt(
-                R.styleable.KeyboardView_gestureFloatingPreviewTextLingerTimeout, 0);
         keyboardViewAttr.recycle();
 
         final TypedArray keyAttr = context.obtainStyledAttributes(attrs,
@@ -250,7 +156,6 @@ public class KeyboardView extends View {
         mKeyVisualAttributes = KeyVisualAttributes.newInstance(keyAttr);
         keyAttr.recycle();
 
-        mPreviewPlacerView = new PreviewPlacerView(context, attrs);
         mPaint.setAntiAlias(true);
     }
 
@@ -286,13 +191,6 @@ public class KeyboardView extends View {
         return mKeyboard;
     }
 
-    // TODO: Move this method to MainKeyboardView
-    public void setGesturePreviewMode(final boolean drawsGesturePreviewTrail,
-            final boolean drawsGestureFloatingPreviewText) {
-        mPreviewPlacerView.setGesturePreviewMode(
-                drawsGesturePreviewTrail, drawsGestureFloatingPreviewText);
-    }
-
     @Override
     protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
         if (mKeyboard != null) {
@@ -733,94 +631,6 @@ public class KeyboardView extends View {
         return paint;
     }
 
-    public void cancelAllMessages() {
-        mDrawingHandler.cancelAllMessages();
-    }
-
-    // TODO: Move this method to MainKeyboardView.
-    protected TextView getKeyPreviewText(final int pointerId) {
-        TextView previewText = mKeyPreviewTexts.get(pointerId);
-        if (previewText != null) {
-            return previewText;
-        }
-        final Context context = getContext();
-        if (mKeyPreviewLayoutId != 0) {
-            previewText = (TextView)LayoutInflater.from(context).inflate(mKeyPreviewLayoutId, null);
-        } else {
-            previewText = new TextView(context);
-        }
-        mKeyPreviewTexts.put(pointerId, previewText);
-        return previewText;
-    }
-
-    // TODO: Move this method to MainKeyboardView.
-    private void dismissAllKeyPreviews() {
-        final int pointerCount = mKeyPreviewTexts.size();
-        for (int id = 0; id < pointerCount; id++) {
-            final TextView previewText = mKeyPreviewTexts.get(id);
-            if (previewText != null) {
-                previewText.setVisibility(INVISIBLE);
-            }
-        }
-        PointerTracker.setReleasedKeyGraphicsToAllKeys();
-    }
-
-    // TODO: Move this to MainKeyboardView
-    protected void addKeyPreview(final TextView keyPreview) {
-        locatePreviewPlacerView();
-        mPreviewPlacerView.addView(
-                keyPreview, ViewLayoutUtils.newLayoutParam(mPreviewPlacerView, 0, 0));
-    }
-
-    // TODO: Move this to MainKeyboardView
-    protected void locatePreviewPlacerView() {
-        if (mPreviewPlacerView.getParent() != null) {
-            return;
-        }
-        final int width = getWidth();
-        final int height = getHeight();
-        if (width == 0 || height == 0) {
-            // In transient state.
-            return;
-        }
-        getLocationInWindow(mOriginCoords);
-        final DisplayMetrics dm = getResources().getDisplayMetrics();
-        if (CoordinateUtils.y(mOriginCoords) < dm.heightPixels / 4) {
-            // In transient state.
-            return;
-        }
-        final View rootView = getRootView();
-        if (rootView == null) {
-            Log.w(TAG, "Cannot find root view");
-            return;
-        }
-        final ViewGroup windowContentView = (ViewGroup)rootView.findViewById(android.R.id.content);
-        // Note: It'd be very weird if we get null by android.R.id.content.
-        if (windowContentView == null) {
-            Log.w(TAG, "Cannot find android.R.id.content view to add PreviewPlacerView");
-        } else {
-            windowContentView.addView(mPreviewPlacerView);
-            mPreviewPlacerView.setKeyboardViewGeometry(mOriginCoords, width, height);
-        }
-    }
-
-    public void showGestureFloatingPreviewText(final SuggestedWords suggestedWords) {
-        locatePreviewPlacerView();
-        mPreviewPlacerView.setGestureFloatingPreviewText(suggestedWords);
-    }
-
-    public void dismissGestureFloatingPreviewText() {
-        locatePreviewPlacerView();
-        mDrawingHandler.dismissGestureFloatingPreviewText(mGestureFloatingPreviewTextLingerTimeout);
-    }
-
-    // TODO: Move This to MainKeyboardView
-    public void showGesturePreviewTrail(final PointerTracker tracker,
-            final boolean isOldestTracker) {
-        locatePreviewPlacerView();
-        mPreviewPlacerView.invalidatePointer(tracker, isOldestTracker);
-    }
-
     /**
      * Requests a redraw of the entire keyboard. Calling {@link #invalidate} is not sufficient
      * because the keyboard renders the keys to an off-screen buffer and an invalidate() only
@@ -850,8 +660,6 @@ public class KeyboardView extends View {
     }
 
     public void closing() {
-        dismissAllKeyPreviews();
-        cancelAllMessages();
         mInvalidateAllKeys = true;
         mKeyboard = null;
         requestLayout();
@@ -861,7 +669,6 @@ public class KeyboardView extends View {
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         closing();
-        mPreviewPlacerView.removeAllViews();
         freeOffscreenBuffer();
     }
 }

java/src/com/android/inputmethod/keyboard/MainKeyboardView.java

@@ -32,7 +32,9 @@ import android.os.Message;
 import android.os.SystemClock;
 import android.preference.PreferenceManager;
 import android.util.AttributeSet;
+import android.util.DisplayMetrics;
 import android.util.Log;
+import android.util.SparseArray;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
@@ -49,7 +51,9 @@ import com.android.inputmethod.keyboard.PointerTracker.DrawingProxy;
 import com.android.inputmethod.keyboard.PointerTracker.TimerProxy;
 import com.android.inputmethod.keyboard.internal.KeyDrawParams;
 import com.android.inputmethod.keyboard.internal.KeyPreviewDrawParams;
+import com.android.inputmethod.keyboard.internal.PreviewPlacerView;
 import com.android.inputmethod.keyboard.internal.TouchScreenRegulator;
+import com.android.inputmethod.latin.CollectionUtils;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.CoordinateUtils;
 import com.android.inputmethod.latin.DebugSettings;
@@ -60,6 +64,7 @@ import com.android.inputmethod.latin.ResourceUtils;
 import com.android.inputmethod.latin.StaticInnerHandlerWrapper;
 import com.android.inputmethod.latin.StringUtils;
 import com.android.inputmethod.latin.SubtypeLocale;
+import com.android.inputmethod.latin.SuggestedWords;
 import com.android.inputmethod.latin.Utils.UsabilityStudyLogUtils;
 import com.android.inputmethod.latin.define.ProductionFlag;
 import com.android.inputmethod.research.ResearchLogger;
@@ -88,11 +93,13 @@ import java.util.WeakHashMap;
  * @attr ref R.styleable#MainKeyboardView_longPressKeyTimeout
  * @attr ref R.styleable#MainKeyboardView_longPressShiftKeyTimeout
  * @attr ref R.styleable#MainKeyboardView_ignoreAltCodeKeyTimeout
+ * @attr ref R.styleable#MainKeyboardView_keyPreviewLayout
  * @attr ref R.styleable#MainKeyboardView_keyPreviewOffset
  * @attr ref R.styleable#MainKeyboardView_keyPreviewHeight
  * @attr ref R.styleable#MainKeyboardView_keyPreviewLingerTimeout
  * @attr ref R.styleable#MainKeyboardView_moreKeysKeyboardLayout
  * @attr ref R.styleable#MainKeyboardView_showMoreKeysKeyboardAtTouchPoint
+ * @attr ref R.styleable#MainKeyboardView_gestureFloatingPreviewTextLingerTimeout
  * @attr ref R.styleable#MainKeyboardView_gestureStaticTimeThresholdAfterFastTyping
  * @attr ref R.styleable#MainKeyboardView_gestureDetectFastMoveSpeedThreshold
  * @attr ref R.styleable#MainKeyboardView_gestureDynamicThresholdDecayDuration
@@ -142,14 +149,19 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
     private ObjectAnimator mAltCodeKeyWhileTypingFadeinAnimator;
     private int mAltCodeKeyWhileTypingAnimAlpha = Constants.Color.ALPHA_OPAQUE;
 
+    // Preview placer view
+    private final PreviewPlacerView mPreviewPlacerView;
+    private final int[] mOriginCoords = CoordinateUtils.newInstance();
+
     // Key preview
     private static final int PREVIEW_ALPHA = 240;
+    private final int mKeyPreviewLayoutId;
     private final int mKeyPreviewOffset;
     private final int mKeyPreviewHeight;
+    private final SparseArray<TextView> mKeyPreviewTexts = CollectionUtils.newSparseArray();
     private final KeyPreviewDrawParams mKeyPreviewDrawParams = new KeyPreviewDrawParams();
     private boolean mShowKeyPreviewPopup = true;
     private int mKeyPreviewLingerTimeout;
-    private final int[] mOriginCoords = CoordinateUtils.newInstance();
 
     // More keys keyboard
     private final WeakHashMap<Key, MoreKeysPanel> mMoreKeysPanelCache =
@@ -160,6 +172,10 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
     // TODO: Consider extending to support multiple more keys panels
     private MoreKeysPanel mMoreKeysPanel;
 
+    // Gesture floating preview text
+    // TODO: Make this parameter customizable by user via settings.
+    private int mGestureFloatingPreviewTextLingerTimeout;
+
     private final TouchScreenRegulator mTouchScreenRegulator;
 
     private KeyDetector mKeyDetector;
@@ -402,6 +418,57 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
         }
     }
 
+    private final DrawingHandler mDrawingHandler = new DrawingHandler(this);
+
+    public static class DrawingHandler extends StaticInnerHandlerWrapper<MainKeyboardView> {
+        private static final int MSG_DISMISS_KEY_PREVIEW = 0;
+        private static final int MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
+
+        public DrawingHandler(final MainKeyboardView outerInstance) {
+            super(outerInstance);
+        }
+
+        @Override
+        public void handleMessage(final Message msg) {
+            final MainKeyboardView mainKeyboardView = getOuterInstance();
+            if (mainKeyboardView == null) return;
+            final PointerTracker tracker = (PointerTracker) msg.obj;
+            switch (msg.what) {
+            case MSG_DISMISS_KEY_PREVIEW:
+                final TextView previewText = mainKeyboardView.mKeyPreviewTexts.get(
+                        tracker.mPointerId);
+                if (previewText != null) {
+                    previewText.setVisibility(INVISIBLE);
+                }
+                break;
+            case MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT:
+                mainKeyboardView.mPreviewPlacerView.setGestureFloatingPreviewText(
+                        SuggestedWords.EMPTY);
+                break;
+            }
+        }
+
+        public void dismissKeyPreview(final long delay, final PointerTracker tracker) {
+            sendMessageDelayed(obtainMessage(MSG_DISMISS_KEY_PREVIEW, tracker), delay);
+        }
+
+        public void cancelDismissKeyPreview(final PointerTracker tracker) {
+            removeMessages(MSG_DISMISS_KEY_PREVIEW, tracker);
+        }
+
+        private void cancelAllDismissKeyPreviews() {
+            removeMessages(MSG_DISMISS_KEY_PREVIEW);
+        }
+
+        public void dismissGestureFloatingPreviewText(final long delay) {
+            sendMessageDelayed(obtainMessage(MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT), delay);
+        }
+
+        public void cancelAllMessages() {
+            cancelAllDismissKeyPreviews();
+        }
+    }
+
     public MainKeyboardView(final Context context, final AttributeSet attrs) {
         this(context, attrs, R.attr.mainKeyboardViewStyle);
     }
@@ -458,6 +525,8 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
                 R.styleable.MainKeyboardView_keyPreviewHeight, 0);
         mKeyPreviewLingerTimeout = mainKeyboardViewAttr.getInt(
                 R.styleable.MainKeyboardView_keyPreviewLingerTimeout, 0);
+        mKeyPreviewLayoutId = mainKeyboardViewAttr.getResourceId(
+                R.styleable.MainKeyboardView_keyPreviewLayout, 0);
         if (mKeyPreviewLayoutId == 0) {
             mShowKeyPreviewPopup = false;
         }
@@ -465,6 +534,9 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
                 R.styleable.MainKeyboardView_moreKeysKeyboardLayout, 0);
         mConfigShowMoreKeysKeyboardAtTouchedPoint = mainKeyboardViewAttr.getBoolean(
                 R.styleable.MainKeyboardView_showMoreKeysKeyboardAtTouchedPoint, false);
+
+        mGestureFloatingPreviewTextLingerTimeout = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureFloatingPreviewTextLingerTimeout, 0);
         PointerTracker.setParameters(mainKeyboardViewAttr);
         mainKeyboardViewAttr.recycle();
 
@@ -474,6 +546,8 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
                 altCodeKeyWhileTypingFadeoutAnimatorResId, this);
         mAltCodeKeyWhileTypingFadeinAnimator = loadObjectAnimator(
                 altCodeKeyWhileTypingFadeinAnimatorResId, this);
+
+        mPreviewPlacerView = new PreviewPlacerView(context, attrs);
     }
 
     private ObjectAnimator loadObjectAnimator(final int resId, final Object target) {
@@ -583,6 +657,38 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
         mKeyPreviewLingerTimeout = delay;
     }
 
+
+    private void locatePreviewPlacerView() {
+        if (mPreviewPlacerView.getParent() != null) {
+            return;
+        }
+        final int width = getWidth();
+        final int height = getHeight();
+        if (width == 0 || height == 0) {
+            // In transient state.
+            return;
+        }
+        getLocationInWindow(mOriginCoords);
+        final DisplayMetrics dm = getResources().getDisplayMetrics();
+        if (CoordinateUtils.y(mOriginCoords) < dm.heightPixels / 4) {
+            // In transient state.
+            return;
+        }
+        final View rootView = getRootView();
+        if (rootView == null) {
+            Log.w(TAG, "Cannot find root view");
+            return;
+        }
+        final ViewGroup windowContentView = (ViewGroup)rootView.findViewById(android.R.id.content);
+        // Note: It'd be very weird if we get null by android.R.id.content.
+        if (windowContentView == null) {
+            Log.w(TAG, "Cannot find android.R.id.content view to add PreviewPlacerView");
+        } else {
+            windowContentView.addView(mPreviewPlacerView);
+            mPreviewPlacerView.setKeyboardViewGeometry(mOriginCoords, width, height);
+        }
+    }
+
     /**
      * Returns the enabled state of the key feedback preview
      * @return whether or not the key feedback preview is enabled
@@ -592,6 +698,38 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
         return mShowKeyPreviewPopup;
     }
 
+    private void addKeyPreview(final TextView keyPreview) {
+        locatePreviewPlacerView();
+        mPreviewPlacerView.addView(
+                keyPreview, ViewLayoutUtils.newLayoutParam(mPreviewPlacerView, 0, 0));
+    }
+
+    private TextView getKeyPreviewText(final int pointerId) {
+        TextView previewText = mKeyPreviewTexts.get(pointerId);
+        if (previewText != null) {
+            return previewText;
+        }
+        final Context context = getContext();
+        if (mKeyPreviewLayoutId != 0) {
+            previewText = (TextView)LayoutInflater.from(context).inflate(mKeyPreviewLayoutId, null);
+        } else {
+            previewText = new TextView(context);
+        }
+        mKeyPreviewTexts.put(pointerId, previewText);
+        return previewText;
+    }
+
+    private void dismissAllKeyPreviews() {
+        final int pointerCount = mKeyPreviewTexts.size();
+        for (int id = 0; id < pointerCount; id++) {
+            final TextView previewText = mKeyPreviewTexts.get(id);
+            if (previewText != null) {
+                previewText.setVisibility(INVISIBLE);
+            }
+        }
+        PointerTracker.setReleasedKeyGraphicsToAllKeys();
+    }
+
     // Background state set
     private static final int[][][] KEY_PREVIEW_BACKGROUND_STATE_TABLE = {
         { // STATE_MIDDLE
@@ -726,6 +864,28 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
         mPreviewPlacerView.dismissSlidingKeyInputPreview();
     }
 
+    public void setGesturePreviewMode(final boolean drawsGesturePreviewTrail,
+            final boolean drawsGestureFloatingPreviewText) {
+        mPreviewPlacerView.setGesturePreviewMode(
+                drawsGesturePreviewTrail, drawsGestureFloatingPreviewText);
+    }
+
+    public void showGestureFloatingPreviewText(final SuggestedWords suggestedWords) {
+        locatePreviewPlacerView();
+        mPreviewPlacerView.setGestureFloatingPreviewText(suggestedWords);
+    }
+
+    public void dismissGestureFloatingPreviewText() {
+        locatePreviewPlacerView();
+        mDrawingHandler.dismissGestureFloatingPreviewText(mGestureFloatingPreviewTextLingerTimeout);
+    }
+
+    public void showGesturePreviewTrail(final PointerTracker tracker,
+            final boolean isOldestTracker) {
+        locatePreviewPlacerView();
+        mPreviewPlacerView.invalidatePointer(tracker, isOldestTracker);
+    }
+
     // Note that this method is called from a non-UI thread.
     public void setMainDictionaryAvailability(final boolean mainDictionaryAvailable) {
         PointerTracker.setMainDictionaryAvailability(mainDictionaryAvailable);
@@ -749,6 +909,7 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
+        mPreviewPlacerView.removeAllViews();
         // Notify the research logger that the keyboard view has been detached.  This is needed
         // to invalidate the reference of {@link MainKeyboardView} to null.
         if (ProductionFlag.IS_EXPERIMENTAL) {
@@ -756,12 +917,6 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
         }
     }
 
-    @Override
-    public void cancelAllMessages() {
-        mKeyTimerHandler.cancelAllMessages();
-        super.cancelAllMessages();
-    }
-
     private boolean openMoreKeysKeyboardIfRequired(final Key parentKey,
             final PointerTracker tracker) {
         // Check if we have a popup layout specified first.
@@ -1065,8 +1220,15 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
                 eventTag + eventTime + "," + id + "," + x + "," + y + "," + size + "," + pressure);
     }
 
+    public void cancelAllMessages() {
+        mKeyTimerHandler.cancelAllMessages();
+        mDrawingHandler.cancelAllMessages();
+    }
+
     @Override
     public void closing() {
+        dismissAllKeyPreviews();
+        cancelAllMessages();
         super.closing();
         onCancelMoreKeysPanel();
         mMoreKeysPanelCache.clear();

java/src/com/android/inputmethod/keyboard/internal/GestureFloatingPreviewText.java

@@ -34,6 +34,14 @@ import com.android.inputmethod.latin.SuggestedWords;
 /**
  * The class for single gesture preview text. The class for multiple gesture preview text will be
  * derived from it.
+ *
+ * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextSize
+ * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextColor
+ * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewTextOffset
+ * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewColor
+ * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewHorizontalPadding
+ * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewVerticalPadding
+ * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewRoundRadius
  */
 public class GestureFloatingPreviewText extends AbstractDrawingPreview {
     private static final class GesturePreviewTextParams {
@@ -50,6 +58,7 @@ public class GestureFloatingPreviewText extends AbstractDrawingPreview {
         private static final char[] TEXT_HEIGHT_REFERENCE_CHAR = { 'M' };
 
         public GesturePreviewTextParams(final TypedArray keyboardViewAttr) {
+            // TODO: Move these XML attributes to MainKeyboardView
             mGesturePreviewTextSize = keyboardViewAttr.getDimensionPixelSize(
                     R.styleable.KeyboardView_gestureFloatingPreviewTextSize, 0);
             mGesturePreviewTextColor = keyboardViewAttr.getColor(

java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java

@@ -25,6 +25,13 @@ import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.ResizableIntArray;
 
+/*
+ * @attr ref R.styleable#KeyboardView_gesturePreviewTrailFadeoutStartDelay
+ * @attr ref R.styleable#KeyboardView_gesturePreviewTrailFadeoutDuration
+ * @attr ref R.styleable#KeyboardView_gesturePreviewTrailUpdateInterval
+ * @attr ref R.styleable#KeyboardView_gesturePreviewTrailColor
+ * @attr ref R.styleable#KeyboardView_gesturePreviewTrailWidth
+ */
 final class GesturePreviewTrail {
     private static final int DEFAULT_CAPACITY = GestureStrokeWithPreviewPoints.PREVIEW_CAPACITY;
 
@@ -47,6 +54,7 @@ final class GesturePreviewTrail {
         public final int mTrailLingerDuration;
 
         public Params(final TypedArray keyboardViewAttr) {
+            // TODO: Move these XML attributes to MainKeyboardView
             mTrailColor = keyboardViewAttr.getColor(
                     R.styleable.KeyboardView_gesturePreviewTrailColor, 0);
             mTrailStartWidth = keyboardViewAttr.getDimension(

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -1617,7 +1617,7 @@ public final class LatinIME extends InputMethodService implements KeyboardAction
     private void showGesturePreviewAndSuggestionStrip(final SuggestedWords suggestedWords,
             final boolean dismissGestureFloatingPreviewText) {
         showSuggestionStrip(suggestedWords, null);
-        final KeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
+        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
         mainKeyboardView.showGestureFloatingPreviewText(suggestedWords);
         if (dismissGestureFloatingPreviewText) {
             mainKeyboardView.dismissGestureFloatingPreviewText();