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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.inputmethod.keyboard.internal;
     18 
     19 import android.graphics.Canvas;
     20 import android.view.View;
     21 
     22 import com.android.inputmethod.keyboard.PointerTracker;
     23 
     24 /**
     25  * Abstract base class for previews that are drawn on PreviewPlacerView, e.g.,
     26  * GestureFloatingPrevewText, GestureTrail, and SlidingKeyInputPreview.
     27  */
     28 public abstract class AbstractDrawingPreview {
     29     private final View mDrawingView;
     30     private boolean mPreviewEnabled;
     31 
     32     protected AbstractDrawingPreview(final View drawingView) {
     33         mDrawingView = drawingView;
     34     }
     35 
     36     public final View getDrawingView() {
     37         return mDrawingView;
     38     }
     39 
     40     public final void setPreviewEnabled(final boolean enabled) {
     41         mPreviewEnabled = enabled;
     42     }
     43 
     44     public boolean isPreviewEnabled() {
     45         return mPreviewEnabled;
     46     }
     47 
     48     public void setKeyboardGeometry(final int[] originCoords, final int width, final int height) {
     49         // Default implementation is empty.
     50     }
     51 
     52     public void onDetachFromWindow() {
     53         // Default implementation is empty.
     54     }
     55 
     56     /**
     57      * Draws the preview
     58      * @param canvas The canvas where the preview is drawn.
     59      */
     60     public abstract void drawPreview(final Canvas canvas);
     61 
     62     /**
     63      * Set the position of the preview.
     64      * @param tracker The new location of the preview is based on the points in PointerTracker.
     65      */
     66     public abstract void setPreviewPosition(final PointerTracker tracker);
     67 }
     68