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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.tv.ui.sidepanel;
import android.support.annotation.UiThread;
import android.view.View;
import android.view.ViewGroup;
@UiThread
public abstract class Item {
private View mItemView;
private boolean mEnabled = true;
private boolean mClickable = true;
public void setEnabled(boolean enabled) {
if (mEnabled != enabled) {
mEnabled = enabled;
if (mItemView != null) {
setEnabledInternal(mItemView, enabled);
}
}
}
/**
* Sets the item to be clickable or not.
*/
public void setClickable(boolean clickable) {
mClickable = clickable;
if (mItemView != null) {
mItemView.setClickable(clickable);
}
}
/**
* Returns whether this item is enabled.
*/
public boolean isEnabled() {
return mEnabled;
}
public final void notifyUpdated() {
if (mItemView != null) {
onUpdate();
}
}
protected abstract int getResourceId();
protected void onBind(View view) {
mItemView = view;
}
protected void onUnbind() {
mItemView = null;
}
/**
* Called after onBind is called and when {@link #notifyUpdated} is called.
* {@link #notifyUpdated} is usually called by {@link SideFragment#notifyItemChanged} and
* {@link SideFragment#notifyItemsChanged}.
*/
protected void onUpdate() {
setEnabledInternal(mItemView, mEnabled);
mItemView.setClickable(mClickable);
}
protected abstract void onSelected();
protected void onFocused() {
}
/**
* Returns true if the item is bound, i.e., onBind is called.
*/
protected boolean isBound() {
return mItemView != null;
}
private void setEnabledInternal(View view, boolean enabled) {
view.setEnabled(enabled);
if (view instanceof ViewGroup) {
ViewGroup parent = (ViewGroup) view;
int childCount = parent.getChildCount();
for (int i = 0; i < childCount; ++i) {
setEnabledInternal(parent.getChildAt(i), enabled);
}
}
}
}
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