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1 /* |
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2 * Copyright (C) 2013 Square, Inc. |
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3 * |
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4 * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 * you may not use this file except in compliance with the License. |
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6 * You may obtain a copy of the License at |
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7 * |
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8 * http://www.apache.org/licenses/LICENSE-2.0 |
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9 * |
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10 * Unless required by applicable law or agreed to in writing, software |
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11 * distributed under the License is distributed on an "AS IS" BASIS, |
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 * See the License for the specific language governing permissions and |
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14 * limitations under the License. |
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15 */ |
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16 package com.squareup.picasso; |
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17 |
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18 import android.graphics.Bitmap; |
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19 import android.graphics.drawable.Drawable; |
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20 |
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21 import static com.squareup.picasso.Picasso.LoadedFrom; |
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22 |
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23 /** |
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24 * Represents an arbitrary listener for image loading. |
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25 * <p/> |
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26 * Objects implementing this class <strong>must</strong> have a working implementation of |
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27 * {@link #equals(Object)} and {@link #hashCode()} for proper storage internally. Instances of this |
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28 * interface will also be compared to determine if view recycling is occurring. It is recommended |
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29 * that you add this interface directly on to a custom view type when using in an adapter to ensure |
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30 * correct recycling behavior. |
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31 */ |
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32 public interface Target { |
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33 /** |
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34 * Callback when an image has been successfully loaded. |
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35 * <p/> |
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36 * <strong>Note:</strong> You must not recycle the bitmap. |
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37 */ |
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38 void onBitmapLoaded(Bitmap bitmap, LoadedFrom from); |
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39 |
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40 /** Callback indicating the image could not be successfully loaded. */ |
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41 void onBitmapFailed(Drawable errorDrawable); |
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42 |
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43 /** Callback invoked right before your request is submitted. */ |
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44 void onPrepareLoad(Drawable placeHolderDrawable); |
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45 } |