| /* |
| * 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); |
| } |
| } |