/*

  * Copyright 2014 - 2015 Henning Dodenhof

  *

  * 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 de.hdodenhof.circleimageview;

 import android.content.Context;

 import android.content.res.TypedArray;

 import android.graphics.Bitmap;

 import android.graphics.BitmapShader;

 import android.graphics.Canvas;

 import android.graphics.Color;

 import android.graphics.ColorFilter;

 import android.graphics.Matrix;

 import android.graphics.Paint;

 import android.graphics.RectF;

 import android.graphics.Shader;

 import android.graphics.drawable.BitmapDrawable;

 import android.graphics.drawable.ColorDrawable;

 import android.graphics.drawable.Drawable;

 import android.net.Uri;

 import android.support.annotation.ColorInt;

 import android.support.annotation.ColorRes;

 import android.support.annotation.DrawableRes;

 import android.util.AttributeSet;

 import android.widget.ImageView;

 public class CircleImageView extends ImageView {

     private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;//这里限制了只要一种模式：CENTER_CROP

     private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;

     private static final int COLORDRAWABLE_DIMENSION = 2;

     private static final int DEFAULT_BORDER_WIDTH = 0;

     private static final int DEFAULT_BORDER_COLOR = Color.BLACK;

     private static final int DEFAULT_FILL_COLOR = Color.TRANSPARENT;

     private static final boolean DEFAULT_BORDER_OVERLAY = false;

     private final RectF mDrawableRect = new RectF();

     private final RectF mBorderRect = new RectF();

     //用来变换 mBitmapShader，从而影响 mBitmapPaint的显示效果

     private final Matrix mShaderMatrix = new Matrix();

     private final Paint mBitmapPaint = new Paint();

     private final Paint mBorderPaint = new Paint();

     private final Paint mFillPaint = new Paint();

     private int mBorderColor = DEFAULT_BORDER_COLOR;

     private int mBorderWidth = DEFAULT_BORDER_WIDTH;

     private int mFillColor = DEFAULT_FILL_COLOR;

     private Bitmap mBitmap;

     private BitmapShader mBitmapShader;

     private int mBitmapWidth;

     private int mBitmapHeight;

     private float mDrawableRadius;

     private float mBorderRadius;

     private ColorFilter mColorFilter;//滤镜效果，用在中间的bitmap上

     private boolean mReady;

     private boolean mSetupPending;

     private boolean mBorderOverlay;

     public CircleImageView(Context context) {

         super(context);

         init();

     }

     public CircleImageView(Context context, AttributeSet attrs) {

         this(context, attrs, 0);

     }

     //构造方法，获取属性文件中的定义，不必细说

     public CircleImageView(Context context, AttributeSet attrs, int defStyle) {

         super(context, attrs, defStyle);

         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);

         mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_civ_border_width, DEFAULT_BORDER_WIDTH);

         mBorderColor = a.getColor(R.styleable.CircleImageView_civ_border_color, DEFAULT_BORDER_COLOR);

         mBorderOverlay = a.getBoolean(R.styleable.CircleImageView_civ_border_overlay, DEFAULT_BORDER_OVERLAY);

         mFillColor = a.getColor(R.styleable.CircleImageView_civ_fill_color, DEFAULT_FILL_COLOR);

         a.recycle();

         init();

     }

     //初始化方法，主要是设置ScaleType，ScaleType被限定为center_crop模式

     private void init() {

         super.setScaleType(SCALE_TYPE);

         mReady = true;

         if (mSetupPending) {

             setup();

             mSetupPending = false;

         }

     }

     @Override

     protected void onSizeChanged(int w, int h, int oldw, int oldh) {

         super.onSizeChanged(w, h, oldw, oldh);

         setup();//实现了refresh功能，当属性改变时，调用此方法，完成刷新界面的功能

     }

     @Override

     protected void onDraw(Canvas canvas) {

         if (mBitmap == null) {

             return;

         }

         //底色 mFillColor --> 画笔 mFillPaint

         if (mFillColor != Color.TRANSPARENT) {

             canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mFillPaint);

         }

         canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mDrawableRadius, mBitmapPaint);

         //边色 mBorderColor --> 画笔 mBorderPaint

         if (mBorderWidth != 0) {

             canvas.drawCircle(getWidth() / 2.0f, getHeight() / 2.0f, mBorderRadius, mBorderPaint);

         }

     }

     private void setup() {

         if (!mReady) {

             mSetupPending = true;

             return;

         }

         if (getWidth() == 0 && getHeight() == 0) {

             return;

         }

         if (mBitmap == null) {

             invalidate();

             return;

         }

         mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

         mBitmapPaint.setAntiAlias(true);

         mBitmapPaint.setShader(mBitmapShader);

         mBorderPaint.setStyle(Paint.Style.STROKE);

         mBorderPaint.setAntiAlias(true);

         mBorderPaint.setColor(mBorderColor);

         mBorderPaint.setStrokeWidth(mBorderWidth);

         mFillPaint.setStyle(Paint.Style.FILL);

         mFillPaint.setAntiAlias(true);

         mFillPaint.setColor(mFillColor);

         mBitmapHeight = mBitmap.getHeight();

         mBitmapWidth = mBitmap.getWidth();

         mBorderRect.set(0, 0, getWidth(), getHeight());

         mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2.0f, (mBorderRect.width() - mBorderWidth) / 2.0f);

         mDrawableRect.set(mBorderRect);

         if (!mBorderOverlay) {

             mDrawableRect.inset(mBorderWidth, mBorderWidth);

         }

         mDrawableRadius = Math.min(mDrawableRect.height() / 2.0f, mDrawableRect.width() / 2.0f);

         updateShaderMatrix();

         invalidate();

     }

     private void updateShaderMatrix() {

         float scale;

         float dx = 0;

         float dy = 0;

         mShaderMatrix.set(null);

         //这里判断长宽比例，即图片的实际长宽比例与view的长宽比例

         //如果图片更"扁"，则缩放的尺寸按照两者的高度来定

         //如果图片更"瘦"，则缩放的尺寸按照两者的宽度来定

         if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {

             scale = mDrawableRect.height() / (float) mBitmapHeight;

             dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;

         } else {

             scale = mDrawableRect.width() / (float) mBitmapWidth;

             dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;

         }

         mShaderMatrix.setScale(scale, scale);

         mShaderMatrix.postTranslate((int) (dx + 0.5f) + mDrawableRect.left, (int) (dy + 0.5f) + mDrawableRect.top);

         //可以简单的将BitmapShader类用来给Paint设置"填充颜色"，这种说法其实并不准确，shader"填充"效果针对的范围是整个canvas，

         //而paint显示的是这个paint实时画出来的部分。

         //shader可以设置matrix，用来缩放或位移

         mBitmapShader.setLocalMatrix(mShaderMatrix);

     }

     @Override

     public ScaleType getScaleType() {

         return SCALE_TYPE;

     }

     @Override

     public void setScaleType(ScaleType scaleType) {

         if (scaleType != SCALE_TYPE) {

             throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));

         }

     }

     @Override

     public void setAdjustViewBounds(boolean adjustViewBounds) {

         if (adjustViewBounds) {

             throw new IllegalArgumentException("adjustViewBounds not supported.");

         }

     }

     public int getBorderColor() {

         return mBorderColor;

     }

     public void setBorderColor(@ColorInt int borderColor) {

         if (borderColor == mBorderColor) {

             return;

         }

         mBorderColor = borderColor;

         mBorderPaint.setColor(mBorderColor);

         invalidate();

     }

     public void setBorderColorResource(@ColorRes int borderColorRes) {

         setBorderColor(getContext().getResources().getColor(borderColorRes));

     }

     public int getFillColor() {

         return mFillColor;

     }

     public void setFillColor(@ColorInt int fillColor) {

         if (fillColor == mFillColor) {

             return;

         }

         mFillColor = fillColor;

         mFillPaint.setColor(fillColor);

         invalidate();

     }

     public void setFillColorResource(@ColorRes int fillColorRes) {

         setFillColor(getContext().getResources().getColor(fillColorRes));

     }

     public int getBorderWidth() {

         return mBorderWidth;

     }

     public void setBorderWidth(int borderWidth) {

         if (borderWidth == mBorderWidth) {

             return;

         }

         mBorderWidth = borderWidth;

         setup();

     }

     public boolean isBorderOverlay() {

         return mBorderOverlay;

     }

     public void setBorderOverlay(boolean borderOverlay) {

         if (borderOverlay == mBorderOverlay) {

             return;

         }

         mBorderOverlay = borderOverlay;

         setup();

     }

     @Override

     public void setImageBitmap(Bitmap bm) {

         super.setImageBitmap(bm);

         mBitmap = bm;

         setup();

     }

     @Override

     public void setImageDrawable(Drawable drawable) {

         super.setImageDrawable(drawable);

         mBitmap = getBitmapFromDrawable(drawable);

         setup();

     }

     @Override

     public void setImageResource(@DrawableRes int resId) {

         super.setImageResource(resId);

         mBitmap = getBitmapFromDrawable(getDrawable());

         setup();

     }

     @Override

     public void setImageURI(Uri uri) {

         super.setImageURI(uri);

         mBitmap = uri != null ? getBitmapFromDrawable(getDrawable()) : null;

         setup();

     }

     @Override

     public void setColorFilter(ColorFilter cf) {

         if (cf == mColorFilter) {

             return;

         }

         mColorFilter = cf;

         mBitmapPaint.setColorFilter(mColorFilter);

         invalidate();

     }

     private Bitmap getBitmapFromDrawable(Drawable drawable) {

         if (drawable == null) {

             return null;

         }

         if (drawable instanceof BitmapDrawable) {

             return ((BitmapDrawable) drawable).getBitmap();

         }

         try {

             Bitmap bitmap;

             if (drawable instanceof ColorDrawable) {

                 //COLORDRAWABLE_DIMENSION == 2，如果是ColorDrawable类型的，就取2x2大小

                 bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);

             } else {

                 bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);

             }

             Canvas canvas = new Canvas(bitmap);

             drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());

             drawable.draw(canvas);

             return bitmap;

         } catch (Exception e) {

             e.printStackTrace();

             return null;

         }

     }

 }