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      1 /*
      2  * Copyright (C) 2013 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.content.res.TypedArray;
     20 import android.graphics.Canvas;
     21 import android.graphics.Paint;
     22 import android.graphics.Path;
     23 
     24 import com.android.inputmethod.keyboard.PointerTracker;
     25 import com.android.inputmethod.latin.R;
     26 import com.android.inputmethod.latin.common.CoordinateUtils;
     27 
     28 /**
     29  * Draw rubber band preview graphics during sliding key input.
     30  *
     31  * @attr ref R.styleable#MainKeyboardView_slidingKeyInputPreviewColor
     32  * @attr ref R.styleable#MainKeyboardView_slidingKeyInputPreviewWidth
     33  * @attr ref R.styleable#MainKeyboardView_slidingKeyInputPreviewBodyRatio
     34  * @attr ref R.styleable#MainKeyboardView_slidingKeyInputPreviewShadowRatio
     35  */
     36 public final class SlidingKeyInputDrawingPreview extends AbstractDrawingPreview {
     37     private final float mPreviewBodyRadius;
     38 
     39     private boolean mShowsSlidingKeyInputPreview;
     40     private final int[] mPreviewFrom = CoordinateUtils.newInstance();
     41     private final int[] mPreviewTo = CoordinateUtils.newInstance();
     42 
     43     // TODO: Finalize the rubber band preview implementation.
     44     private final RoundedLine mRoundedLine = new RoundedLine();
     45     private final Paint mPaint = new Paint();
     46 
     47     public SlidingKeyInputDrawingPreview(final TypedArray mainKeyboardViewAttr) {
     48         final int previewColor = mainKeyboardViewAttr.getColor(
     49                 R.styleable.MainKeyboardView_slidingKeyInputPreviewColor, 0);
     50         final float previewRadius = mainKeyboardViewAttr.getDimension(
     51                 R.styleable.MainKeyboardView_slidingKeyInputPreviewWidth, 0) / 2.0f;
     52         final int PERCENTAGE_INT = 100;
     53         final float previewBodyRatio = (float)mainKeyboardViewAttr.getInt(
     54                 R.styleable.MainKeyboardView_slidingKeyInputPreviewBodyRatio, PERCENTAGE_INT)
     55                 / (float)PERCENTAGE_INT;
     56         mPreviewBodyRadius = previewRadius * previewBodyRatio;
     57         final int previewShadowRatioInt = mainKeyboardViewAttr.getInt(
     58                 R.styleable.MainKeyboardView_slidingKeyInputPreviewShadowRatio, 0);
     59         if (previewShadowRatioInt > 0) {
     60             final float previewShadowRatio = (float)previewShadowRatioInt / (float)PERCENTAGE_INT;
     61             final float shadowRadius = previewRadius * previewShadowRatio;
     62             mPaint.setShadowLayer(shadowRadius, 0.0f, 0.0f, previewColor);
     63         }
     64         mPaint.setColor(previewColor);
     65     }
     66 
     67     @Override
     68     public void onDeallocateMemory() {
     69         // Nothing to do here.
     70     }
     71 
     72     public void dismissSlidingKeyInputPreview() {
     73         mShowsSlidingKeyInputPreview = false;
     74         invalidateDrawingView();
     75     }
     76 
     77     /**
     78      * Draws the preview
     79      * @param canvas The canvas where the preview is drawn.
     80      */
     81     @Override
     82     public void drawPreview(final Canvas canvas) {
     83         if (!isPreviewEnabled() || !mShowsSlidingKeyInputPreview) {
     84             return;
     85         }
     86 
     87         // TODO: Finalize the rubber band preview implementation.
     88         final float radius = mPreviewBodyRadius;
     89         final Path path = mRoundedLine.makePath(
     90                 CoordinateUtils.x(mPreviewFrom), CoordinateUtils.y(mPreviewFrom), radius,
     91                 CoordinateUtils.x(mPreviewTo), CoordinateUtils.y(mPreviewTo), radius);
     92         canvas.drawPath(path, mPaint);
     93     }
     94 
     95     /**
     96      * Set the position of the preview.
     97      * @param tracker The new location of the preview is based on the points in PointerTracker.
     98      */
     99     @Override
    100     public void setPreviewPosition(final PointerTracker tracker) {
    101         tracker.getDownCoordinates(mPreviewFrom);
    102         tracker.getLastCoordinates(mPreviewTo);
    103         mShowsSlidingKeyInputPreview = true;
    104         invalidateDrawingView();
    105     }
    106 }
    107