ViewOscillator.java
/*
* Copyright (C) 2020 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 androidx.constraintlayout.motion.utils;
import android.os.Build;
import android.util.Log;
import android.view.View;
import androidx.constraintlayout.core.motion.utils.KeyCycleOscillator;
import androidx.constraintlayout.motion.widget.Key;
import androidx.constraintlayout.motion.widget.MotionLayout;
import androidx.constraintlayout.widget.ConstraintAttribute;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Provide the engine for executing cycles.
* KeyCycleOscillator
*
*
*/
public abstract class ViewOscillator extends KeyCycleOscillator {
private static final String TAG = "ViewOscillator";
/**
* Set the property of that view
* @param view
* @param t
*/
public abstract void setProperty(View view, float t);
/**
* Create a spline that manipulates a specific property of a view
* @param str the property to manipulate
* @return
*/
public static ViewOscillator makeSpline(String str) {
if (str.startsWith(Key.CUSTOM)) {
return new CustomSet();
}
switch (str) {
case Key.ALPHA:
return new AlphaSet();
case Key.ELEVATION:
return new ElevationSet();
case Key.ROTATION:
return new RotationSet();
case Key.ROTATION_X:
return new RotationXset();
case Key.ROTATION_Y:
return new RotationYset();
case Key.TRANSITION_PATH_ROTATE:
return new PathRotateSet();
case Key.SCALE_X:
return new ScaleXset();
case Key.SCALE_Y:
return new ScaleYset();
case Key.WAVE_OFFSET:
return new AlphaSet();
case Key.WAVE_VARIES_BY:
return new AlphaSet();
case Key.TRANSLATION_X:
return new TranslationXset();
case Key.TRANSLATION_Y:
return new TranslationYset();
case Key.TRANSLATION_Z:
return new TranslationZset();
case Key.PROGRESS:
return new ProgressSet();
default:
return null;
}
}
static class ElevationSet extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
view.setElevation(get(t));
}
}
}
static class AlphaSet extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setAlpha(get(t));
}
}
static class RotationSet extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setRotation(get(t));
}
}
static class RotationXset extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setRotationX(get(t));
}
}
static class RotationYset extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setRotationY(get(t));
}
}
public static class PathRotateSet extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
}
/**
* use to modify the rotation relative to the current path
* @param view the view to modify
* @param t the point in time to manipulate
* @param dx of the path
* @param dy of the path
*/
public void setPathRotate(View view, float t, double dx, double dy) {
view.setRotation(get(t) + (float) Math.toDegrees(Math.atan2(dy, dx)));
}
}
static class ScaleXset extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setScaleX(get(t));
}
}
static class ScaleYset extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setScaleY(get(t));
}
}
static class TranslationXset extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setTranslationX(get(t));
}
}
static class TranslationYset extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
view.setTranslationY(get(t));
}
}
static class TranslationZset extends ViewOscillator {
@Override
public void setProperty(View view, float t) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
view.setTranslationZ(get(t));
}
}
}
static class CustomSet extends ViewOscillator {
float[] mValue = new float[1];
protected ConstraintAttribute mCustom;
@Override
protected void setCustom(Object custom) {
mCustom = (ConstraintAttribute) custom;
}
@Override
public void setProperty(View view, float t) {
mValue[0] = get(t);
CustomSupport.setInterpolatedValue(mCustom, view, mValue);
}
}
static class ProgressSet extends ViewOscillator {
boolean mNoMethod = false;
@Override
public void setProperty(View view, float t) {
if (view instanceof MotionLayout) {
((MotionLayout) view).setProgress(get(t));
} else {
if (mNoMethod) {
return;
}
Method method = null;
try {
method = view.getClass().getMethod("setProgress", Float.TYPE);
} catch (NoSuchMethodException e) {
mNoMethod = true;
}
if (method != null) {
try {
method.invoke(view, get(t));
} catch (IllegalAccessException e) {
Log.e(TAG, "unable to setProgress", e);
} catch (InvocationTargetException e) {
Log.e(TAG, "unable to setProgress", e);
}
}
}
}
}
}