/
ReactiveGuide.java
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/
ReactiveGuide.java
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/*
* 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.widget;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;
import androidx.constraintlayout.motion.widget.MotionLayout;
/**
* Utility class representing a reactive Guideline helper object for {@link ConstraintLayout}.
*/
public class ReactiveGuide extends View implements SharedValues.SharedValuesListener {
private int mAttributeId = -1;
private boolean mAnimateChange = false;
private int mApplyToConstraintSetId = 0;
private boolean mApplyToAllConstraintSets = true;
public ReactiveGuide(Context context) {
super(context);
super.setVisibility(View.GONE);
init(null);
}
public ReactiveGuide(Context context, AttributeSet attrs) {
super(context, attrs);
super.setVisibility(View.GONE);
init(attrs);
}
public ReactiveGuide(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
super.setVisibility(View.GONE);
init(attrs);
}
public ReactiveGuide(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr);
super.setVisibility(View.GONE);
init(attrs);
}
private void init(AttributeSet attrs) {
if (attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.ConstraintLayout_ReactiveGuide);
final int N = a.getIndexCount();
for (int i = 0; i < N; i++) {
int attr = a.getIndex(i);
if (attr == R.styleable.ConstraintLayout_ReactiveGuide_reactiveGuide_valueId) {
mAttributeId = a.getResourceId(attr, mAttributeId);
} else if (attr == R.styleable.ConstraintLayout_ReactiveGuide_reactiveGuide_animateChange) {
mAnimateChange = a.getBoolean(attr, mAnimateChange);
} else if (attr == R.styleable.ConstraintLayout_ReactiveGuide_reactiveGuide_applyToConstraintSet) {
mApplyToConstraintSetId = a.getResourceId(attr, mApplyToConstraintSetId);
} else if (attr == R.styleable.ConstraintLayout_ReactiveGuide_reactiveGuide_applyToAllConstraintSets) {
mApplyToAllConstraintSets = a.getBoolean(attr, mApplyToAllConstraintSets);
}
}
a.recycle();
}
if (mAttributeId != -1) {
SharedValues sharedValues = ConstraintLayout.getSharedValues();
sharedValues.addListener(mAttributeId, this);
}
}
public int getAttributeId() { return mAttributeId; }
public void setAttributeId(int id) {
SharedValues sharedValues = ConstraintLayout.getSharedValues();
if (mAttributeId != -1) {
sharedValues.removeListener(mAttributeId, this);
}
mAttributeId = id;
if (mAttributeId != -1) {
sharedValues.addListener(mAttributeId, this);
}
}
public int getApplyToConstraintSetId() {
return mApplyToConstraintSetId;
}
public void setApplyToConstraintSetId(int id) {
mApplyToConstraintSetId = id;
}
public boolean isAnimatingChange() { return mAnimateChange; }
public void setAnimateChange(boolean animate) {
mAnimateChange = animate;
}
/**
* {@hide
*/
@Override
public void setVisibility(int visibility) {
}
/**
* {@hide
*/
@SuppressLint("MissingSuperCall")
@Override
public void draw(Canvas canvas) {
}
/**
* {@hide
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(0, 0);
}
/**
* Set the guideline's distance from the top or left edge.
*
* @param margin the distance to the top or left edge
*/
public void setGuidelineBegin(int margin) {
ConstraintLayout.LayoutParams params = (ConstraintLayout.LayoutParams) getLayoutParams();
params.guideBegin = margin;
setLayoutParams(params);
}
/**
* Set a guideline's distance to end.
*
* @param margin the margin to the right or bottom side of container
*/
public void setGuidelineEnd(int margin) {
ConstraintLayout.LayoutParams params = (ConstraintLayout.LayoutParams) getLayoutParams();
params.guideEnd = margin;
setLayoutParams(params);
}
/**
* Set a Guideline's percent.
* @param ratio the ratio between the gap on the left and right 0.0 is top/left 0.5 is middle
*/
public void setGuidelinePercent(float ratio) {
ConstraintLayout.LayoutParams params = (ConstraintLayout.LayoutParams) getLayoutParams();
params.guidePercent = ratio;
setLayoutParams(params);
}
@Override
public void onNewValue(int key, int newValue, int oldValue) {
setGuidelineBegin(newValue);
int id = getId();
if (id <= 0) {
return;
}
if (getParent() instanceof MotionLayout) {
MotionLayout motionLayout = (MotionLayout) getParent();
int currentState = motionLayout.getCurrentState();
if (mApplyToConstraintSetId != 0) {
currentState = mApplyToConstraintSetId;
}
if (mAnimateChange) {
if (mApplyToAllConstraintSets) {
int ids[] = motionLayout.getConstraintSetIds();
for (int i = 0; i < ids.length; i++) {
int cs = ids[i];
if (cs != currentState) {
changeValue(newValue, id, motionLayout, cs);
}
}
}
ConstraintSet constraintSet = motionLayout.cloneConstraintSet(currentState);
constraintSet.setGuidelineEnd(id, newValue);
motionLayout.updateStateAnimate(currentState, constraintSet, 1000);
} else {
if (mApplyToAllConstraintSets) {
int ids[] = motionLayout.getConstraintSetIds();
for (int i = 0; i < ids.length; i++) {
int cs = ids[i];
changeValue(newValue, id, motionLayout, cs);
}
} else {
changeValue(newValue, id, motionLayout, currentState);
}
}
}
}
private void changeValue(int newValue, int id, MotionLayout motionLayout, int currentState) {
ConstraintSet constraintSet = motionLayout.getConstraintSet(currentState);
constraintSet.setGuidelineEnd(id, newValue);
motionLayout.updateState(currentState, constraintSet);
}
}