BarrierReference.java
/*
* Copyright 2019 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.core.state.helpers;
import androidx.constraintlayout.core.state.ConstraintReference;
import androidx.constraintlayout.core.state.HelperReference;
import androidx.constraintlayout.core.state.State;
import androidx.constraintlayout.core.widgets.Barrier;
import androidx.constraintlayout.core.widgets.HelperWidget;
public class BarrierReference extends HelperReference {
private State.Direction mDirection;
private int mMargin;
private Barrier mBarrierWidget;
public BarrierReference(State state) {
super(state, State.Helper.BARRIER);
}
public void setBarrierDirection(State.Direction barrierDirection) {
mDirection = barrierDirection;
}
@Override
public ConstraintReference margin(Object marginValue) {
margin(mHelperState.convertDimension(marginValue));
return this;
}
// @TODO: add description
@Override
public ConstraintReference margin(int value) {
mMargin = value;
return this;
}
@Override
public HelperWidget getHelperWidget() {
if (mBarrierWidget == null) {
mBarrierWidget = new Barrier();
}
return mBarrierWidget;
}
// @TODO: add description
@Override
public void apply() {
getHelperWidget();
int direction = Barrier.LEFT;
switch (mDirection) {
case LEFT:
case START: {
// TODO: handle RTL
}
break;
case RIGHT:
case END: {
// TODO: handle RTL
direction = Barrier.RIGHT;
}
break;
case TOP: {
direction = Barrier.TOP;
}
break;
case BOTTOM: {
direction = Barrier.BOTTOM;
}
}
mBarrierWidget.setBarrierType(direction);
mBarrierWidget.setMargin(mMargin);
}
}