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/*
* Copyright (C) 2015 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.deskclock.widget;
import android.transition.Fade;
import android.transition.Transition;
import android.transition.TransitionManager;
import android.transition.TransitionSet;
import android.view.View;
import android.view.ViewGroup;
import com.android.deskclock.Utils;
/**
* Controller that displays empty view and handles animation appropriately.
*/
public final class EmptyViewController {
private static final int ANIMATION_DURATION = 300;
private final Transition mEmptyViewTransition;
private final ViewGroup mMainLayout;
private final View mContentView;
private final View mEmptyView;
private boolean mIsEmpty;
/**
* Constructor of the controller.
*
* @param contentView The view that should be displayed when empty view is hidden.
* @param emptyView The view that should be displayed when main view is empty.
*/
public EmptyViewController(ViewGroup mainLayout, View contentView, View emptyView) {
mMainLayout = mainLayout;
mContentView = contentView;
mEmptyView = emptyView;
mEmptyViewTransition = new TransitionSet()
.setOrdering(TransitionSet.ORDERING_SEQUENTIAL)
.addTarget(contentView)
.addTarget(emptyView)
.addTransition(new Fade(Fade.OUT))
.addTransition(new Fade(Fade.IN))
.setDuration(ANIMATION_DURATION);
}
/**
* Sets the state for the controller. If it's empty, it will display the empty view.
*
* @param isEmpty Whether or not the controller should transition into empty state.
*/
public void setEmpty(boolean isEmpty) {
if (mIsEmpty == isEmpty) {
return;
}
mIsEmpty = isEmpty;
// State changed, perform transition.
TransitionManager.beginDelayedTransition(mMainLayout, mEmptyViewTransition);
mEmptyView.setVisibility(mIsEmpty ? View.VISIBLE : View.GONE);
mContentView.setVisibility(mIsEmpty ? View.GONE : View.VISIBLE);
}
}
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