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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.view.ViewTreeObserver; |
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19 import android.widget.ImageView; |
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20 import java.lang.ref.WeakReference; |
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21 |
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22 class DeferredRequestCreator implements ViewTreeObserver.OnPreDrawListener { |
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23 |
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24 final RequestCreator creator; |
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25 final WeakReference<ImageView> target; |
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26 Callback callback; |
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27 |
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28 DeferredRequestCreator(RequestCreator creator, ImageView target, Callback callback) { |
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29 this.creator = creator; |
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30 this.target = new WeakReference<ImageView>(target); |
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31 this.callback = callback; |
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32 target.getViewTreeObserver().addOnPreDrawListener(this); |
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33 } |
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34 |
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35 @Override public boolean onPreDraw() { |
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36 ImageView target = this.target.get(); |
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37 if (target == null) { |
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38 return true; |
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39 } |
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40 ViewTreeObserver vto = target.getViewTreeObserver(); |
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41 if (!vto.isAlive()) { |
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42 return true; |
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43 } |
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44 |
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45 int width = target.getMeasuredWidth(); |
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46 int height = target.getMeasuredHeight(); |
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47 |
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48 if (width <= 0 || height <= 0) { |
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49 return true; |
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50 } |
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51 |
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52 vto.removeOnPreDrawListener(this); |
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53 |
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54 this.creator.unfit().resize(width, height).into(target, callback); |
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55 return true; |
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56 } |
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57 |
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58 void cancel() { |
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59 callback = null; |
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60 ImageView target = this.target.get(); |
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61 if (target == null) { |
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62 return; |
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63 } |
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64 ViewTreeObserver vto = target.getViewTreeObserver(); |
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65 if (!vto.isAlive()) { |
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66 return; |
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67 } |
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68 vto.removeOnPreDrawListener(this); |
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69 } |
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70 } |