George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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 | package android.transition; |
| 17 | |
| 18 | import android.graphics.Rect; |
George Mount | 7764b92 | 2016-01-13 14:51:33 -0800 | [diff] [blame^] | 19 | import android.transition.Slide.GravityFlag; |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 20 | import android.view.Gravity; |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 21 | import android.view.View; |
| 22 | import android.view.ViewGroup; |
| 23 | |
| 24 | /** |
| 25 | * A <code>TransitionPropagation</code> that propagates based on the distance to the side |
| 26 | * and, orthogonally, the distance to epicenter. If the transitioning View is visible in |
| 27 | * the start of the transition, then it will transition sooner when closer to the side and |
| 28 | * later when farther. If the view is not visible in the start of the transition, then |
| 29 | * it will transition later when closer to the side and sooner when farther from the edge. |
| 30 | * This is the default TransitionPropagation used with {@link android.transition.Slide}. |
| 31 | */ |
| 32 | public class SidePropagation extends VisibilityPropagation { |
| 33 | private static final String TAG = "SlidePropagation"; |
| 34 | |
George Mount | 265f209 | 2014-04-30 16:24:53 -0700 | [diff] [blame] | 35 | private float mPropagationSpeed = 3.0f; |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 36 | private int mSide = Gravity.BOTTOM; |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 37 | |
| 38 | /** |
| 39 | * Sets the side that is used to calculate the transition propagation. If the transitioning |
| 40 | * View is visible in the start of the transition, then it will transition sooner when |
| 41 | * closer to the side and later when farther. If the view is not visible in the start of |
| 42 | * the transition, then it will transition later when closer to the side and sooner when |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 43 | * farther from the edge. The default is {@link Gravity#BOTTOM}. |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 44 | * |
| 45 | * @param side The side that is used to calculate the transition propagation. Must be one of |
George Mount | 2db3bf5 | 2014-11-19 14:05:57 -0800 | [diff] [blame] | 46 | * {@link Gravity#LEFT}, {@link Gravity#TOP}, {@link Gravity#RIGHT}, |
| 47 | * {@link Gravity#BOTTOM}, {@link Gravity#START}, or {@link Gravity#END}. |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 48 | */ |
George Mount | 7764b92 | 2016-01-13 14:51:33 -0800 | [diff] [blame^] | 49 | public void setSide(@GravityFlag int side) { |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 50 | mSide = side; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Sets the speed at which transition propagation happens, relative to the duration of the |
| 55 | * Transition. A <code>propagationSpeed</code> of 1 means that a View centered at the side |
| 56 | * set in {@link #setSide(int)} and View centered at the opposite edge will have a difference |
| 57 | * in start delay of approximately the duration of the Transition. A speed of 2 means the |
| 58 | * start delay difference will be approximately half of the duration of the transition. A |
| 59 | * value of 0 is illegal, but negative values will invert the propagation. |
| 60 | * |
| 61 | * @param propagationSpeed The speed at which propagation occurs, relative to the duration |
| 62 | * of the transition. A speed of 4 means it works 4 times as fast |
| 63 | * as the duration of the transition. May not be 0. |
| 64 | */ |
| 65 | public void setPropagationSpeed(float propagationSpeed) { |
| 66 | if (propagationSpeed == 0) { |
| 67 | throw new IllegalArgumentException("propagationSpeed may not be 0"); |
| 68 | } |
| 69 | mPropagationSpeed = propagationSpeed; |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public long getStartDelay(ViewGroup sceneRoot, Transition transition, |
| 74 | TransitionValues startValues, TransitionValues endValues) { |
| 75 | if (startValues == null && endValues == null) { |
| 76 | return 0; |
| 77 | } |
| 78 | int directionMultiplier = 1; |
| 79 | Rect epicenter = transition.getEpicenter(); |
| 80 | TransitionValues positionValues; |
| 81 | if (endValues == null || getViewVisibility(startValues) == View.VISIBLE) { |
| 82 | positionValues = startValues; |
| 83 | directionMultiplier = -1; |
| 84 | } else { |
| 85 | positionValues = endValues; |
| 86 | } |
| 87 | |
| 88 | int viewCenterX = getViewX(positionValues); |
| 89 | int viewCenterY = getViewY(positionValues); |
| 90 | |
| 91 | int[] loc = new int[2]; |
| 92 | sceneRoot.getLocationOnScreen(loc); |
| 93 | int left = loc[0] + Math.round(sceneRoot.getTranslationX()); |
| 94 | int top = loc[1] + Math.round(sceneRoot.getTranslationY()); |
| 95 | int right = left + sceneRoot.getWidth(); |
| 96 | int bottom = top + sceneRoot.getHeight(); |
| 97 | |
| 98 | int epicenterX; |
| 99 | int epicenterY; |
| 100 | if (epicenter != null) { |
| 101 | epicenterX = epicenter.centerX(); |
| 102 | epicenterY = epicenter.centerY(); |
| 103 | } else { |
| 104 | epicenterX = (left + right) / 2; |
| 105 | epicenterY = (top + bottom) / 2; |
| 106 | } |
| 107 | |
George Mount | 2db3bf5 | 2014-11-19 14:05:57 -0800 | [diff] [blame] | 108 | float distance = distance(sceneRoot, viewCenterX, viewCenterY, epicenterX, epicenterY, |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 109 | left, top, right, bottom); |
| 110 | float maxDistance = getMaxDistance(sceneRoot); |
| 111 | float distanceFraction = distance/maxDistance; |
| 112 | |
George Mount | 265f209 | 2014-04-30 16:24:53 -0700 | [diff] [blame] | 113 | long duration = transition.getDuration(); |
| 114 | if (duration < 0) { |
| 115 | duration = 300; |
| 116 | } |
| 117 | |
| 118 | return Math.round(duration * directionMultiplier / mPropagationSpeed * distanceFraction); |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 119 | } |
| 120 | |
George Mount | 2db3bf5 | 2014-11-19 14:05:57 -0800 | [diff] [blame] | 121 | private int distance(View sceneRoot, int viewX, int viewY, int epicenterX, int epicenterY, |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 122 | int left, int top, int right, int bottom) { |
George Mount | 2db3bf5 | 2014-11-19 14:05:57 -0800 | [diff] [blame] | 123 | final int side; |
| 124 | if (mSide == Gravity.START) { |
| 125 | final boolean isRtl = sceneRoot.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL; |
| 126 | side = isRtl ? Gravity.RIGHT : Gravity.LEFT; |
| 127 | } else if (mSide == Gravity.END) { |
| 128 | final boolean isRtl = sceneRoot.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL; |
| 129 | side = isRtl ? Gravity.LEFT : Gravity.RIGHT; |
| 130 | } else { |
| 131 | side = mSide; |
| 132 | } |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 133 | int distance = 0; |
George Mount | 2db3bf5 | 2014-11-19 14:05:57 -0800 | [diff] [blame] | 134 | switch (side) { |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 135 | case Gravity.LEFT: |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 136 | distance = right - viewX + Math.abs(epicenterY - viewY); |
| 137 | break; |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 138 | case Gravity.TOP: |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 139 | distance = bottom - viewY + Math.abs(epicenterX - viewX); |
| 140 | break; |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 141 | case Gravity.RIGHT: |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 142 | distance = viewX - left + Math.abs(epicenterY - viewY); |
| 143 | break; |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 144 | case Gravity.BOTTOM: |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 145 | distance = viewY - top + Math.abs(epicenterX - viewX); |
| 146 | break; |
| 147 | } |
| 148 | return distance; |
| 149 | } |
| 150 | |
| 151 | private int getMaxDistance(ViewGroup sceneRoot) { |
| 152 | switch (mSide) { |
George Mount | dc21d3b | 2014-06-05 09:42:48 -0700 | [diff] [blame] | 153 | case Gravity.LEFT: |
| 154 | case Gravity.RIGHT: |
George Mount | 2db3bf5 | 2014-11-19 14:05:57 -0800 | [diff] [blame] | 155 | case Gravity.START: |
| 156 | case Gravity.END: |
George Mount | d6107a3 | 2014-03-10 16:51:16 -0700 | [diff] [blame] | 157 | return sceneRoot.getWidth(); |
| 158 | default: |
| 159 | return sceneRoot.getHeight(); |
| 160 | } |
| 161 | } |
| 162 | } |