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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 com.cyanogenmod.eleven.ui.fragments;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import com.cyanogenmod.eleven.ui.activities.HomeActivity;
public abstract class FadingBarFragment extends DetailFragment implements OnScrollListener {
protected static final int ACTION_BAR_DEFAULT_OPACITY = 100;
@Override
public void setupActionBar() {
super.setupActionBar();
getContainingActivity().setActionBarAlpha(ACTION_BAR_DEFAULT_OPACITY);
getContainingActivity().setFragmentPadding(false);
}
protected abstract int getHeaderHeight();
protected abstract void setHeaderPosition(float y);
@Override // OnScrollListener
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
View firstChild = view.getChildAt(0);
if (firstChild == null) {
return;
}
float firstChildY = firstChild.getY();
int alpha = 255;
if (firstVisibleItem == 0) {
// move header to current top of list
setHeaderPosition(firstChildY);
// calculate alpha for the action bar
alpha = ACTION_BAR_DEFAULT_OPACITY +
(int)((255 - ACTION_BAR_DEFAULT_OPACITY) * -firstChildY /
(float)(firstChild.getHeight()));
if(alpha > 255) { alpha = 255; }
} else {
// header off screen
setHeaderPosition(-getHeaderHeight());
}
HomeActivity home = getContainingActivity();
if (home != null && home.getTopFragment() == this) {
home.setActionBarAlpha(alpha);
}
}
@Override // OnScrollListener
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
}
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