/*
* Copyright 2014 Soichiro Kashima
*
* 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.marshalchen.common.demoofui.observablescrollview;
import android.os.Bundle;
import android.support.v4.view.ViewCompat;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import com.github.ksoichiro.android.observablescrollview.ObservableListView;
import com.github.ksoichiro.android.observablescrollview.ObservableScrollViewCallbacks;
import com.github.ksoichiro.android.observablescrollview.ScrollState;
import com.marshalchen.common.demoofui.R;
import com.nineoldandroids.view.ViewHelper;
import com.nineoldandroids.view.ViewPropertyAnimator;
import java.util.ArrayList;
import java.util.List;
public class ToolbarControlListViewActivity extends ActionBarActivity implements ObservableScrollViewCallbacks {
private static final String TAG = ToolbarControlListViewActivity.class.getSimpleName();
private View mHeaderView;
private View mToolbarView;
private ObservableListView mListView;
private int mBaseTranslationY;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.observable_scroll_view_activity_toolbarcontrollistview);
setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
mHeaderView = findViewById(R.id.header);
ViewCompat.setElevation(mHeaderView, getResources().getDimension(R.dimen.toolbar_elevation));
mToolbarView = findViewById(R.id.toolbar);
mListView = (ObservableListView) findViewById(R.id.list);
mListView.setScrollViewCallbacks(this);
LayoutInflater inflater = LayoutInflater.from(this);
mListView.addHeaderView(inflater.inflate(R.layout.observable_scroll_view_padding, null)); // toolbar
mListView.addHeaderView(inflater.inflate(R.layout.observable_scroll_view_padding, null)); // sticky view
List<String> items = new ArrayList<String>();
for (int i = 1; i <= 100; i++) {
items.add("Item " + i);
}
mListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items));
// ObservableListView uses setOnScrollListener, but it still works.
mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
Log.v(TAG, "onScrollStateChanged: " + scrollState);
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
Log.v(TAG, "onScroll: firstVisibleItem: " + firstVisibleItem + " visibleItemCount: " + visibleItemCount + " totalItemCount: " + totalItemCount);
}
});
}
@Override
public void onScrollChanged(int scrollY, boolean firstScroll, boolean dragging) {
if (dragging) {
int toolbarHeight = mToolbarView.getHeight();
if (firstScroll) {
float currentHeaderTranslationY = ViewHelper.getTranslationY(mHeaderView);
if (-toolbarHeight < currentHeaderTranslationY && toolbarHeight < scrollY) {
mBaseTranslationY = scrollY;
}
}
int headerTranslationY = Math.min(0, Math.max(-toolbarHeight, -(scrollY - mBaseTranslationY)));
ViewPropertyAnimator.animate(mHeaderView).cancel();
ViewHelper.setTranslationY(mHeaderView, headerTranslationY);
}
}
@Override
public void onDownMotionEvent() {
}
@Override
public void onUpOrCancelMotionEvent(ScrollState scrollState) {
mBaseTranslationY = 0;
float headerTranslationY = ViewHelper.getTranslationY(mHeaderView);
int toolbarHeight = mToolbarView.getHeight();
if (scrollState == ScrollState.UP) {
if (toolbarHeight < mListView.getCurrentScrollY()) {
if (headerTranslationY != -toolbarHeight) {
ViewPropertyAnimator.animate(mHeaderView).cancel();
ViewPropertyAnimator.animate(mHeaderView).translationY(-toolbarHeight).setDuration(200).start();
}
}
} else if (scrollState == ScrollState.DOWN) {
if (toolbarHeight < mListView.getCurrentScrollY()) {
if (headerTranslationY != 0) {
ViewPropertyAnimator.animate(mHeaderView).cancel();
ViewPropertyAnimator.animate(mHeaderView).translationY(0).setDuration(200).start();
}
}
}
}
}