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/*
* Copyright (C) 2011 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.android.systemui.recent;
import android.animation.LayoutTransition;
import android.content.Context;
import android.content.res.Configuration;
import android.database.DataSetObserver;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import com.android.systemui.R;
import com.android.systemui.SwipeHelper;
import com.android.systemui.recent.RecentsPanelView.ActivityDescriptionAdapter;
public class RecentsVerticalScrollView extends ScrollView implements SwipeHelper.Callback {
private static final String TAG = RecentsPanelView.TAG;
private static final boolean DEBUG = RecentsPanelView.DEBUG;
private LinearLayout mLinearLayout;
private ActivityDescriptionAdapter mAdapter;
private RecentsCallback mCallback;
protected int mLastScrollPosition;
private SwipeHelper mSwipeHelper;
private OnLongClickListener mOnLongClick = new OnLongClickListener() {
public boolean onLongClick(View v) {
final View anchorView = v.findViewById(R.id.app_description);
mCallback.handleLongPress(v, anchorView);
return true;
}
};
public RecentsVerticalScrollView(Context context) {
this(context, null);
}
public RecentsVerticalScrollView(Context context, AttributeSet attrs) {
super(context, attrs, 0);
float densityScale = getResources().getDisplayMetrics().density;
float pagingTouchSlop = ViewConfiguration.get(mContext).getScaledPagingTouchSlop();
mSwipeHelper = new SwipeHelper(SwipeHelper.X, this, densityScale, pagingTouchSlop);
}
private int scrollPositionOfMostRecent() {
return mLinearLayout.getHeight() - getHeight();
}
private void update() {
mLinearLayout.removeAllViews();
for (int i = 0; i < mAdapter.getCount(); i++) {
final View view = mAdapter.getView(i, null, mLinearLayout);
view.setClickable(true);
view.setOnLongClickListener(mOnLongClick);
final View thumbnail = getChildContentView(view);
// thumbnail is set to clickable in the layout file
thumbnail.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mCallback.handleOnClick(view);
}
});
mLinearLayout.addView(view);
}
// Scroll to end after layout.
post(new Runnable() {
public void run() {
mLastScrollPosition = scrollPositionOfMostRecent();
scrollTo(0, mLastScrollPosition);
}
});
}
@Override
public void removeViewInLayout(final View view) {
dismissChild(view);
}
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (DEBUG) Log.v(TAG, "onInterceptTouchEvent()");
return mSwipeHelper.onInterceptTouchEvent(ev) ||
super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
return mSwipeHelper.onTouchEvent(ev) ||
super.onTouchEvent(ev);
}
public boolean canChildBeDismissed(View v) {
return true;
}
public void dismissChild(View v) {
mSwipeHelper.dismissChild(v, 0);
}
public void onChildDismissed(View v) {
mLinearLayout.removeView(v);
mCallback.handleSwipe(v);
}
public void onBeginDrag(View v) {
}
public View getChildAtPosition(MotionEvent ev) {
final float x = ev.getX() + getScrollX();
final float y = ev.getY() + getScrollY();
for (int i = 0; i < mLinearLayout.getChildCount(); i++) {
View item = mLinearLayout.getChildAt(i);
if (x >= item.getLeft() && x < item.getRight()
&& y >= item.getTop() && y < item.getBottom()) {
return item;
}
}
return null;
}
public View getChildContentView(View v) {
return v.findViewById(R.id.app_thumbnail);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
setScrollbarFadingEnabled(true);
mLinearLayout = (LinearLayout) findViewById(R.id.recents_linear_layout);
final int leftPadding = mContext.getResources()
.getDimensionPixelOffset(R.dimen.status_bar_recents_thumbnail_left_margin);
setOverScrollEffectPadding(leftPadding, 0);
}
@Override
protected void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
float densityScale = getResources().getDisplayMetrics().density;
mSwipeHelper.setDensityScale(densityScale);
float pagingTouchSlop = ViewConfiguration.get(mContext).getScaledPagingTouchSlop();
mSwipeHelper.setPagingTouchSlop(pagingTouchSlop);
}
private void setOverScrollEffectPadding(int leftPadding, int i) {
// TODO Add to (Vertical)ScrollView
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// Keep track of the last visible item in the list so we can restore it
// to the bottom when the orientation changes.
mLastScrollPosition = scrollPositionOfMostRecent();
// This has to happen post-layout, so run it "in the future"
post(new Runnable() {
public void run() {
scrollTo(0, mLastScrollPosition);
}
});
}
@Override
protected void onVisibilityChanged(View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
// scroll to bottom after reloading
if (visibility == View.VISIBLE && changedView == this) {
post(new Runnable() {
public void run() {
update();
}
});
}
}
public void setAdapter(ActivityDescriptionAdapter adapter) {
mAdapter = adapter;
mAdapter.registerDataSetObserver(new DataSetObserver() {
public void onChanged() {
update();
}
public void onInvalidated() {
update();
}
});
}
@Override
public void setLayoutTransition(LayoutTransition transition) {
// The layout transition applies to our embedded LinearLayout
mLinearLayout.setLayoutTransition(transition);
}
public void setCallback(RecentsCallback callback) {
mCallback = callback;
}
}
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