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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.emoji;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.graphics.Paint;
     22 import android.util.AttributeSet;
     23 import android.view.View;
     24 
     25 public final class EmojiCategoryPageIndicatorView extends View {
     26     private static final float BOTTOM_MARGIN_RATIO = 1.0f;
     27     private final Paint mPaint = new Paint();
     28     private int mCategoryPageSize = 0;
     29     private int mCurrentCategoryPageId = 0;
     30     private float mOffset = 0.0f;
     31 
     32     public EmojiCategoryPageIndicatorView(final Context context, final AttributeSet attrs) {
     33         this(context, attrs, 0);
     34     }
     35 
     36     public EmojiCategoryPageIndicatorView(final Context context, final AttributeSet attrs,
     37             final int defStyle) {
     38         super(context, attrs, defStyle);
     39     }
     40 
     41     public void setColors(final int foregroundColor, final int backgroundColor) {
     42         mPaint.setColor(foregroundColor);
     43         setBackgroundColor(backgroundColor);
     44     }
     45 
     46     public void setCategoryPageId(final int size, final int id, final float offset) {
     47         mCategoryPageSize = size;
     48         mCurrentCategoryPageId = id;
     49         mOffset = offset;
     50         invalidate();
     51     }
     52 
     53     @Override
     54     protected void onDraw(final Canvas canvas) {
     55         if (mCategoryPageSize <= 1) {
     56             // If the category is not set yet or contains only one category,
     57             // just clear and return.
     58             canvas.drawColor(0);
     59             return;
     60         }
     61         final float height = getHeight();
     62         final float width = getWidth();
     63         final float unitWidth = width / mCategoryPageSize;
     64         final float left = unitWidth * mCurrentCategoryPageId + mOffset * unitWidth;
     65         final float top = 0.0f;
     66         final float right = left + unitWidth;
     67         final float bottom = height * BOTTOM_MARGIN_RATIO;
     68         canvas.drawRect(left, top, right, bottom, mPaint);
     69     }
     70 }
     71