Add SlidingKeyInputPreview class

Change-Id: Ided47b3420b0b1e34063f30d5142a1858af2718e

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

@@ -57,9 +57,7 @@ public final class PreviewPlacerView extends RelativeLayout {
     private final Rect mGesturePreviewTrailBoundsRect = new Rect(); // per trail
     // TODO: Move these AbstractDrawingPvreiew objects to MainKeyboardView.
     private final GestureFloatingPreviewText mGestureFloatingPreviewText;
-    private boolean mShowSlidingKeyInputPreview;
-    private final int[] mRubberBandFrom = CoordinateUtils.newInstance();
-    private final int[] mRubberBandTo = CoordinateUtils.newInstance();
+    private final SlidingKeyInputPreview mSlidingKeyInputPreview;
 
     private final DrawingHandler mDrawingHandler;
 
@@ -107,6 +105,7 @@ public final class PreviewPlacerView extends RelativeLayout {
         // MultiGesturePreviewText, depending on the user's choice in the settings.
         mGestureFloatingPreviewText = new GestureFloatingPreviewText(this, mainKeyboardViewAttr);
         mGesturePreviewTrailParams = new Params(mainKeyboardViewAttr);
+        mSlidingKeyInputPreview = new SlidingKeyInputPreview(this, mainKeyboardViewAttr);
         mainKeyboardViewAttr.recycle();
 
         mDrawingHandler = new DrawingHandler(this, mGesturePreviewTrailParams);
@@ -125,6 +124,7 @@ public final class PreviewPlacerView extends RelativeLayout {
             final int height) {
         CoordinateUtils.copy(mKeyboardViewOrigin, originCoords);
         mGestureFloatingPreviewText.setKeyboardGeometry(originCoords, width, height);
+        mSlidingKeyInputPreview.setKeyboardGeometry(originCoords, width, height);
         mOffscreenOffsetY = (int)(
                 height * GestureStroke.EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO);
         mOffscreenWidth = width;
@@ -156,25 +156,21 @@ public final class PreviewPlacerView extends RelativeLayout {
         }
     }
 
+    // TODO: Move this method to MainKeyboardView
     public void showSlidingKeyInputPreview(final PointerTracker tracker) {
-        if (!tracker.isInSlidingKeyInputFromModifier()) {
-            mShowSlidingKeyInputPreview = false;
-            return;
-        }
-        tracker.getDownCoordinates(mRubberBandFrom);
-        tracker.getLastCoordinates(mRubberBandTo);
-        mShowSlidingKeyInputPreview = true;
-        invalidate();
+        mSlidingKeyInputPreview.setPreviewPosition(tracker);
     }
 
+    // TODO: Move this method to MainKeyboardView
     public void dismissSlidingKeyInputPreview() {
-        mShowSlidingKeyInputPreview = false;
+        mSlidingKeyInputPreview.dismissSlidingKeyInputPreview();
     }
 
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         mGestureFloatingPreviewText.onDetachFromWindow();
+        mSlidingKeyInputPreview.onDetachFromWindow();
         freeOffscreenBuffer();
     }
 
@@ -221,9 +217,7 @@ public final class PreviewPlacerView extends RelativeLayout {
             }
         }
         mGestureFloatingPreviewText.drawPreview(canvas);
-        if (mShowSlidingKeyInputPreview) {
-            drawSlidingKeyInputPreview(canvas);
-        }
+        mSlidingKeyInputPreview.drawPreview(canvas);
         canvas.translate(-originX, -originY);
     }
 
@@ -253,11 +247,8 @@ public final class PreviewPlacerView extends RelativeLayout {
         return needsUpdatingGesturePreviewTrail;
     }
 
+    // TODO: Move this method to MainKeyboardView.
     public void setGestureFloatingPreviewText(final SuggestedWords suggestedWords) {
         mGestureFloatingPreviewText.setSuggetedWords(suggestedWords);
     }
-
-    private void drawSlidingKeyInputPreview(final Canvas canvas) {
-        // TODO: Implement rubber band preview
-    }
 }

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

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2013 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.inputmethod.keyboard.internal;
+
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.view.View;
+
+import com.android.inputmethod.keyboard.PointerTracker;
+import com.android.inputmethod.latin.CoordinateUtils;
+
+/**
+ * Draw rubber band preview graphics during sliding key input.
+ */
+public final class SlidingKeyInputPreview extends AbstractDrawingPreview {
+    private boolean mShowSlidingKeyInputPreview;
+    private final int[] mRubberBandFrom = CoordinateUtils.newInstance();
+    private final int[] mRubberBandTo = CoordinateUtils.newInstance();
+
+    public SlidingKeyInputPreview(final View drawingView, final TypedArray mainKeyboardViewAttr) {
+        super(drawingView);
+    }
+
+    public void dismissSlidingKeyInputPreview() {
+        mShowSlidingKeyInputPreview = false;
+    }
+
+    /**
+     * Draws the preview
+     * @param canvas The canvas where the preview is drawn.
+     */
+    @Override
+    public void drawPreview(final Canvas canvas) {
+        if (!isPreviewEnabled() || mShowSlidingKeyInputPreview == false) {
+            return;
+        }
+        // TODO: Implement rubber band preview
+    }
+
+    /**
+     * Set the position of the preview.
+     * @param tracker The new location of the preview is based on the points in PointerTracker.
+     */
+    @Override
+    public void setPreviewPosition(final PointerTracker tracker) {
+        if (!tracker.isInSlidingKeyInputFromModifier()) {
+            mShowSlidingKeyInputPreview = false;
+            return;
+        }
+        tracker.getDownCoordinates(mRubberBandFrom);
+        tracker.getLastCoordinates(mRubberBandTo);
+        mShowSlidingKeyInputPreview = true;
+        getDrawingView().invalidate();
+    }
+}