michael@0: /*
michael@0:  * Copyright (C) 2013 Square, Inc.
michael@0:  *
michael@0:  * Licensed under the Apache License, Version 2.0 (the "License");
michael@0:  * you may not use this file except in compliance with the License.
michael@0:  * You may obtain a copy of the License at
michael@0:  *
michael@0:  *      http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing, software
michael@0:  * distributed under the License is distributed on an "AS IS" BASIS,
michael@0:  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
michael@0:  * See the License for the specific language governing permissions and
michael@0:  * limitations under the License.
michael@0:  */
michael@0: package com.squareup.picasso;
michael@0: 
michael@0: import android.content.Context;
michael@0: import android.content.res.Resources;
michael@0: import android.graphics.Bitmap;
michael@0: import android.graphics.Canvas;
michael@0: import android.graphics.ColorFilter;
michael@0: import android.graphics.Paint;
michael@0: import android.graphics.Path;
michael@0: import android.graphics.Point;
michael@0: import android.graphics.Rect;
michael@0: import android.graphics.drawable.AnimationDrawable;
michael@0: import android.graphics.drawable.BitmapDrawable;
michael@0: import android.graphics.drawable.Drawable;
michael@0: import android.os.SystemClock;
michael@0: import android.widget.ImageView;
michael@0: 
michael@0: import static android.graphics.Color.WHITE;
michael@0: import static com.squareup.picasso.Picasso.LoadedFrom.MEMORY;
michael@0: 
michael@0: final class PicassoDrawable extends Drawable {
michael@0:   // Only accessed from main thread.
michael@0:   private static final Paint DEBUG_PAINT = new Paint();
michael@0: 
michael@0:   private static final float FADE_DURATION = 200f; //ms
michael@0: 
michael@0:   /**
michael@0:    * Create or update the drawable on the target {@link ImageView} to display the supplied bitmap
michael@0:    * image.
michael@0:    */
michael@0:   static void setBitmap(ImageView target, Context context, Bitmap bitmap,
michael@0:       Picasso.LoadedFrom loadedFrom, boolean noFade, boolean debugging) {
michael@0:     Drawable placeholder = target.getDrawable();
michael@0:     if (placeholder instanceof AnimationDrawable) {
michael@0:       ((AnimationDrawable) placeholder).stop();
michael@0:     }
michael@0:     PicassoDrawable drawable =
michael@0:         new PicassoDrawable(context, placeholder, bitmap, loadedFrom, noFade, debugging);
michael@0:     target.setImageDrawable(drawable);
michael@0:   }
michael@0: 
michael@0:   /**
michael@0:    * Create or update the drawable on the target {@link ImageView} to display the supplied
michael@0:    * placeholder image.
michael@0:    */
michael@0:   static void setPlaceholder(ImageView target, int placeholderResId, Drawable placeholderDrawable) {
michael@0:     if (placeholderResId != 0) {
michael@0:       target.setImageResource(placeholderResId);
michael@0:     } else {
michael@0:       target.setImageDrawable(placeholderDrawable);
michael@0:     }
michael@0:     if (target.getDrawable() instanceof AnimationDrawable) {
michael@0:       ((AnimationDrawable) target.getDrawable()).start();
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   private final boolean debugging;
michael@0:   private final float density;
michael@0:   private final Picasso.LoadedFrom loadedFrom;
michael@0:   final BitmapDrawable image;
michael@0: 
michael@0:   Drawable placeholder;
michael@0: 
michael@0:   long startTimeMillis;
michael@0:   boolean animating;
michael@0:   int alpha = 0xFF;
michael@0: 
michael@0:   PicassoDrawable(Context context, Drawable placeholder, Bitmap bitmap,
michael@0:       Picasso.LoadedFrom loadedFrom, boolean noFade, boolean debugging) {
michael@0:     Resources res = context.getResources();
michael@0: 
michael@0:     this.debugging = debugging;
michael@0:     this.density = res.getDisplayMetrics().density;
michael@0: 
michael@0:     this.loadedFrom = loadedFrom;
michael@0: 
michael@0:     this.image = new BitmapDrawable(res, bitmap);
michael@0: 
michael@0:     boolean fade = loadedFrom != MEMORY && !noFade;
michael@0:     if (fade) {
michael@0:       this.placeholder = placeholder;
michael@0:       animating = true;
michael@0:       startTimeMillis = SystemClock.uptimeMillis();
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   @Override public void draw(Canvas canvas) {
michael@0:     if (!animating) {
michael@0:       image.draw(canvas);
michael@0:     } else {
michael@0:       float normalized = (SystemClock.uptimeMillis() - startTimeMillis) / FADE_DURATION;
michael@0:       if (normalized >= 1f) {
michael@0:         animating = false;
michael@0:         placeholder = null;
michael@0:         image.draw(canvas);
michael@0:       } else {
michael@0:         if (placeholder != null) {
michael@0:           placeholder.draw(canvas);
michael@0:         }
michael@0: 
michael@0:         int partialAlpha = (int) (alpha * normalized);
michael@0:         image.setAlpha(partialAlpha);
michael@0:         image.draw(canvas);
michael@0:         image.setAlpha(alpha);
michael@0:         invalidateSelf();
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     if (debugging) {
michael@0:       drawDebugIndicator(canvas);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   @Override public int getIntrinsicWidth() {
michael@0:     return image.getIntrinsicWidth();
michael@0:   }
michael@0: 
michael@0:   @Override public int getIntrinsicHeight() {
michael@0:     return image.getIntrinsicHeight();
michael@0:   }
michael@0: 
michael@0:   @Override public void setAlpha(int alpha) {
michael@0:     this.alpha = alpha;
michael@0:     if (placeholder != null) {
michael@0:       placeholder.setAlpha(alpha);
michael@0:     }
michael@0:     image.setAlpha(alpha);
michael@0:   }
michael@0: 
michael@0:   @Override public void setColorFilter(ColorFilter cf) {
michael@0:     if (placeholder != null) {
michael@0:       placeholder.setColorFilter(cf);
michael@0:     }
michael@0:     image.setColorFilter(cf);
michael@0:   }
michael@0: 
michael@0:   @Override public int getOpacity() {
michael@0:     return image.getOpacity();
michael@0:   }
michael@0: 
michael@0:   @Override protected void onBoundsChange(Rect bounds) {
michael@0:     super.onBoundsChange(bounds);
michael@0: 
michael@0:     image.setBounds(bounds);
michael@0:     if (placeholder != null) {
michael@0:       placeholder.setBounds(bounds);
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   private void drawDebugIndicator(Canvas canvas) {
michael@0:     DEBUG_PAINT.setColor(WHITE);
michael@0:     Path path = getTrianglePath(new Point(0, 0), (int) (16 * density));
michael@0:     canvas.drawPath(path, DEBUG_PAINT);
michael@0: 
michael@0:     DEBUG_PAINT.setColor(loadedFrom.debugColor);
michael@0:     path = getTrianglePath(new Point(0, 0), (int) (15 * density));
michael@0:     canvas.drawPath(path, DEBUG_PAINT);
michael@0:   }
michael@0: 
michael@0:   private static Path getTrianglePath(Point p1, int width) {
michael@0:     Point p2 = new Point(p1.x + width, p1.y);
michael@0:     Point p3 = new Point(p1.x, p1.y + width);
michael@0: 
michael@0:     Path path = new Path();
michael@0:     path.moveTo(p1.x, p1.y);
michael@0:     path.lineTo(p2.x, p2.y);
michael@0:     path.lineTo(p3.x, p3.y);
michael@0: 
michael@0:     return path;
michael@0:   }
michael@0: }