GuidelineReference.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.Reference;
import androidx.constraintlayout.core.state.State;
import androidx.constraintlayout.core.widgets.ConstraintWidget;
import androidx.constraintlayout.core.widgets.Guideline;
public class GuidelineReference implements Facade, Reference {
final State mState;
private int mOrientation;
private Guideline mGuidelineWidget;
private int mStart = -1;
private int mEnd = -1;
private float mPercent = 0;
private Object mKey;
@Override
public void setKey(Object key) {
this.mKey = key;
}
@Override
public Object getKey() {
return mKey;
}
public GuidelineReference(State state) {
mState = state;
}
// @TODO: add description
public GuidelineReference start(Object margin) {
mStart = mState.convertDimension(margin);
mEnd = -1;
mPercent = 0;
return this;
}
// @TODO: add description
public GuidelineReference end(Object margin) {
mStart = -1;
mEnd = mState.convertDimension(margin);
mPercent = 0;
return this;
}
// @TODO: add description
public GuidelineReference percent(float percent) {
mStart = -1;
mEnd = -1;
mPercent = percent;
return this;
}
public void setOrientation(int orientation) {
mOrientation = orientation;
}
public int getOrientation() {
return mOrientation;
}
// @TODO: add description
@Override
public void apply() {
mGuidelineWidget.setOrientation(mOrientation);
if (mStart != -1) {
mGuidelineWidget.setGuideBegin(mStart);
} else if (mEnd != -1) {
mGuidelineWidget.setGuideEnd(mEnd);
} else {
mGuidelineWidget.setGuidePercent(mPercent);
}
}
@Override
public Facade getFacade() {
return null;
}
@Override
public ConstraintWidget getConstraintWidget() {
if (mGuidelineWidget == null) {
mGuidelineWidget = new Guideline();
}
return mGuidelineWidget;
}
@Override
public void setConstraintWidget(ConstraintWidget widget) {
if (widget instanceof Guideline) {
mGuidelineWidget = (Guideline) widget;
} else {
mGuidelineWidget = null;
}
}
}