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Roman Nurik's UndoBarController, using NineOldAndroids
/*
* Copyright 2012 Roman Nurik
*
* 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.undobar;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.AnimatorListenerAdapter;
import com.nineoldandroids.animation.ValueAnimator;
import com.nineoldandroids.view.ViewPropertyAnimator;
import android.os.Bundle;
import android.os.Handler;
import android.os.Parcelable;
import android.text.TextUtils;
import android.view.View;
import android.widget.TextView;
import static com.nineoldandroids.view.ViewHelper.setAlpha;
import static com.nineoldandroids.view.ViewPropertyAnimator.animate;
public class UndoBarController {
private View mBarView;
private TextView mMessageView;
private ViewPropertyAnimator mBarAnimator;
private Handler mHideHandler = new Handler();
private UndoListener mUndoListener;
// State objects
private Parcelable mUndoToken;
private CharSequence mUndoMessage;
public interface UndoListener {
void onUndo(Parcelable token);
}
public UndoBarController(View undoBarView, UndoListener undoListener) {
mBarView = undoBarView;
mBarAnimator = animate(mBarView);
mUndoListener = undoListener;
mMessageView = (TextView) mBarView.findViewById(R.id.undobar_message);
mBarView.findViewById(R.id.undobar_button)
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
hideUndoBar(false);
mUndoListener.onUndo(mUndoToken);
}
});
hideUndoBar(true);
}
public void showUndoBar(boolean immediate, CharSequence message, Parcelable undoToken) {
mUndoToken = undoToken;
mUndoMessage = message;
mMessageView.setText(mUndoMessage);
mHideHandler.removeCallbacks(mHideRunnable);
mHideHandler.postDelayed(mHideRunnable, 5000);
mBarView.setVisibility(View.VISIBLE);
if (immediate) {
mBarView.setAlpha(1);
} else {
mBarAnimator.cancel();
mBarAnimator
.alpha(1)
.setDuration(
mBarView.getResources()
.getInteger(android.R.integer.config_shortAnimTime))
.setListener(null);
}
}
public void hideUndoBar(boolean immediate) {
mHideHandler.removeCallbacks(mHideRunnable);
if (immediate) {
mBarView.setVisibility(View.GONE);
setAlpha(mBarView, 0);
mUndoMessage = null;
mUndoToken = null;
} else {
mBarAnimator.cancel();
mBarAnimator
.alpha(0)
.setDuration(mBarView.getResources()
.getInteger(android.R.integer.config_shortAnimTime))
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mBarView.setVisibility(View.GONE);
mUndoMessage = null;
mUndoToken = null;
}
});
}
}
public void onSaveInstanceState(Bundle outState) {
outState.putCharSequence("undo_message", mUndoMessage);
outState.putParcelable("undo_token", mUndoToken);
}
public void onRestoreInstanceState(Bundle savedInstanceState) {
if (savedInstanceState != null) {
mUndoMessage = savedInstanceState.getCharSequence("undo_message");
mUndoToken = savedInstanceState.getParcelable("undo_token");
if (mUndoToken != null || !TextUtils.isEmpty(mUndoMessage)) {
showUndoBar(true, mUndoMessage, mUndoToken);
}
}
}
private Runnable mHideRunnable = new Runnable() {
@Override
public void run() {
hideUndoBar(false);
}
};
}
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