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/*
* Copyright (C) 2015 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 android.databinding;
import android.os.Parcel;
import android.os.Parcelable;
import java.io.Serializable;
/**
* An observable class that holds a primitive double.
* <p>
* Observable field classes may be used instead of creating an Observable object:
* <pre><code>public class MyDataObject {
* public final ObservableDouble temperature = new ObservableDouble();
* }</code></pre>
* Fields of this type should be declared final because bindings only detect changes in the
* field's value, not of the field itself.
* <p>
* This class is parcelable and serializable but callbacks are ignored when the object is
* parcelled / serialized. Unless you add custom callbacks, this will not be an issue because
* data binding framework always re-registers callbacks when the view is bound.
*/
public class ObservableDouble extends BaseObservable implements Parcelable, Serializable {
static final long serialVersionUID = 1L;
private double mValue;
/**
* Creates an ObservableDouble with the given initial value.
*
* @param value the initial value for the ObservableDouble
*/
public ObservableDouble(double value) {
mValue = value;
}
/**
* Creates an ObservableDouble with the initial value of <code>0</code>.
*/
public ObservableDouble() {
}
/**
* @return the stored value.
*/
public double get() {
return mValue;
}
/**
* Set the stored value.
*/
public void set(double value) {
if (value != mValue) {
mValue = value;
notifyChange();
}
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeDouble(mValue);
}
public static final Parcelable.Creator<ObservableDouble> CREATOR
= new Parcelable.Creator<ObservableDouble>() {
@Override
public ObservableDouble createFromParcel(Parcel source) {
return new ObservableDouble(source.readDouble());
}
@Override
public ObservableDouble[] newArray(int size) {
return new ObservableDouble[size];
}
};
}
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