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author | Sunny Goyal <sunnygoyal@google.com> | 2018-05-10 16:31:00 -0700 |
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committer | Sunny Goyal <sunnygoyal@google.com> | 2018-05-11 12:18:39 -0700 |
commit | 6001ea2e2f1f22e08f229d07e41ff56230d0574d (patch) | |
tree | aac0fa4bf5951c423fc4aa87b56b94beb5595ee0 /src/com/android/launcher3/util/MultiValueAlpha.java | |
parent | 08cf36ea546a65c15ca7651042f3dc48805fdab0 (diff) | |
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Separating the draglayer alpha into multiple dimensions so that different animaitons
can run without affecting the other.
Bug: 79323355
Bug: 78880824
Change-Id: I11cb464ebdaad0a7f0a56d4bc4c3dff1d56da16b
Diffstat (limited to 'src/com/android/launcher3/util/MultiValueAlpha.java')
-rw-r--r-- | src/com/android/launcher3/util/MultiValueAlpha.java | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/com/android/launcher3/util/MultiValueAlpha.java b/src/com/android/launcher3/util/MultiValueAlpha.java new file mode 100644 index 000000000..f810f483d --- /dev/null +++ b/src/com/android/launcher3/util/MultiValueAlpha.java @@ -0,0 +1,101 @@ +/* + * Copyright (C) 2018 The Android Open Source Project + * + * 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 com.android.launcher3.util; + +import android.util.Property; +import android.view.View; + +/** + * Utility class to handle separating a single value as a factor of multiple values + */ +public class MultiValueAlpha { + + public static final Property<AlphaProperty, Float> VALUE = + new Property<AlphaProperty, Float>(Float.TYPE, "value") { + + @Override + public Float get(AlphaProperty alphaProperty) { + return alphaProperty.mValue; + } + + @Override + public void set(AlphaProperty object, Float value) { + object.setValue(value); + } + }; + + private final View mView; + private final AlphaProperty[] mMyProperties; + + private int mValidMask; + + public MultiValueAlpha(View view, int size) { + mView = view; + mMyProperties = new AlphaProperty[size]; + + mValidMask = 0; + for (int i = 0; i < size; i++) { + int myMask = 1 << i; + mValidMask |= myMask; + mMyProperties[i] = new AlphaProperty(myMask); + } + } + + public AlphaProperty getProperty(int index) { + return mMyProperties[index]; + } + + public class AlphaProperty { + + private final int mMyMask; + + private float mValue = 1; + // Factor of all other alpha channels, only valid if mMyMask is present in mValidMask. + private float mOthers = 1; + + AlphaProperty(int myMask) { + mMyMask = myMask; + } + + public void setValue(float value) { + if (mValue == value) { + return; + } + + if ((mValidMask & mMyMask) == 0) { + // Our cache value is not correct, recompute it. + mOthers = 1; + for (AlphaProperty prop : mMyProperties) { + if (prop != this) { + mOthers *= prop.mValue; + } + } + } + + // Since we have changed our value, all other caches except our own need to be + // recomputed. Change mValidMask to indicate the new valid caches (only our own). + mValidMask = mMyMask; + mValue = value; + + mView.setAlpha(mOthers * mValue); + } + + public float getValue() { + return mValue; + } + } +} |