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/*
* Copyright (C) 2013 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 com.example.android.slidingfragments;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;
/**
* In order to animate the fragment containing text on/off the screen,
* it is required that we know the height of the device being used. However,
* this can only be determined at runtime, so we cannot specify the required
* translation in an xml file. Since FragmentTransaction's setCustomAnimations
* method requires an ID of an animation defined via an xml file, this linear
* layout was built as a workaround. This custom linear layout is created to specify
* the location of the fragment's layout as a fraction of the device's height. By
* animating yFraction from 0 to 1, we can animate the fragment from the top of
* the screen to the bottom of the screen, regardless of the device's specific size.
*/
public class FractionalLinearLayout extends LinearLayout {
private float mYFraction;
private int mScreenHeight;
public FractionalLinearLayout(Context context) {
super(context);
}
public FractionalLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mScreenHeight = h;
setY(mScreenHeight);
}
public float getYFraction() {
return mYFraction;
}
public void setYFraction(float yFraction) {
mYFraction = yFraction;
setY((mScreenHeight > 0) ? (mScreenHeight - yFraction * mScreenHeight) : 0);
}
}
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