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/*
* Copyright (C) 2014 The CyanogenMod 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 org.cyanogenmod.theme.chooserv2;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.animation.DecelerateInterpolator;
import android.widget.ScrollView;
import org.cyanogenmod.theme.chooser.R;
import java.util.ArrayList;
import java.util.List;
public class ThemeFragment extends Fragment {
public static final int ANIMATE_START_DELAY = 75;
public static final int ANIMATE_DURATION = 500;
public static final int ANIMATE_INTERPOLATE_FACTOR = 3;
private ScrollView mScrollView;
private ViewGroup mScrollContent;
static ThemeFragment newInstance(String pkgName) {
ThemeFragment f = new ThemeFragment();
Bundle args = new Bundle();
args.putString("pkgName", pkgName);
f.setArguments(args);
return f;
}
/**
* When creating, retrieve this instance's number from its arguments.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
/**
* The Fragment's UI is just a simple text view showing its
* instance number.
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ViewPager.LayoutParams params = new ViewPager.LayoutParams();
params.width = ViewPager.LayoutParams.MATCH_PARENT;
params.height = ViewPager.LayoutParams.MATCH_PARENT;
View v = inflater.inflate(R.layout.v2_fragment_pager_list, container, false);
v.setLayoutParams(params);
mScrollView = (ScrollView) v.findViewById(android.R.id.list);
mScrollContent = (ViewGroup) mScrollView.getChildAt(0);
return v;
}
public void expand() {
for (int i = 0; i < mScrollContent.getChildCount(); i++) {
View child = mScrollContent.getChildAt(i);
ViewGroup.LayoutParams layout = child.getLayoutParams();
layout.height = 400;
child.setLayoutParams(layout);
}
mScrollContent.requestLayout();
animateChildren();
}
public void collapse() {
for (int i = 0; i < mScrollContent.getChildCount(); i++) {
View child = mScrollContent.getChildAt(i);
ViewGroup.LayoutParams layout = child.getLayoutParams();
layout.height = ViewGroup.LayoutParams.WRAP_CONTENT;
child.setLayoutParams(layout);
}
mScrollContent.requestLayout();
animateChildren();
}
// This will animate the children's vertical value between the existing and
// new layout changes
private void animateChildren() {
final ViewGroup root = (ViewGroup) getActivity().getWindow()
.getDecorView().findViewById(android.R.id.content);
// Get the child's current location
final List<Float> prevYs = new ArrayList<Float>();
for (int i = 0; i < mScrollContent.getChildCount(); i++) {
final View v = mScrollContent.getChildAt(i);
int[] pos = new int[2];
v.getLocationInWindow(pos);
prevYs.add((float) pos[1]);
}
// Grab the child's new location and animate from prev to current loc.
final ViewTreeObserver observer = mScrollContent.getViewTreeObserver();
observer.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
observer.removeOnPreDrawListener(this);
for (int i = mScrollContent.getChildCount() - 1; i >= 0; i--) {
final View v = mScrollContent.getChildAt(i);
float prevY;
float endY;
if (i >= prevYs.size()) {
// View is being created
prevY = mScrollContent.getTop() + mScrollContent.getHeight();
endY = v.getY();
} else {
prevY = prevYs.get(i);
int[] endPos = new int[2];
v.getLocationInWindow(endPos);
endY = endPos[1];
}
v.setTranslationY((prevY - endY));
root.getOverlay().add(v);
v.animate()
.setStartDelay(ANIMATE_START_DELAY)
.translationY(0)
.setDuration(ANIMATE_DURATION)
.setInterpolator(
new DecelerateInterpolator(ANIMATE_INTERPOLATE_FACTOR))
.withEndAction(new Runnable() {
public void run() {
root.getOverlay().remove(v);
mScrollContent.addView(v, 0);
}
});
}
return false;
}
});
}
}
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