library/main/src/com/android/setupwizardlib/items/ButtonBarItem.java


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/*
 * Copyright (C) 2016 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.setupwizardlib.items;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

import com.android.setupwizardlib.R;

import java.util.ArrayList;

/**
 * A list item with one or more buttons, declared as
 * {@link com.android.setupwizardlib.items.ButtonItem}.
 *
 * <p>Example usage:
 * <pre>{@code
 * &lt;ButtonBarItem&gt;
 *
 *     &lt;ButtonItem
 *         android:id="@+id/skip_button"
 *         android:text="@string/skip_button_label /&gt;
 *
 *     &lt;ButtonItem
 *         android:id="@+id/next_button"
 *         android:text="@string/next_button_label
 *         android:theme="@style/SuwButtonItem.Colored" /&gt;
 *
 * &lt;/ButtonBarItem&gt;
 * }</pre>
 */
public class ButtonBarItem extends AbstractItem implements ItemInflater.ItemParent {

    private final ArrayList<ButtonItem> mButtons = new ArrayList<>();
    private boolean mVisible = true;

    public ButtonBarItem() {
        super();
    }

    public ButtonBarItem(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public int getCount() {
        return isVisible() ? 1 : 0;
    }

    @Override
    public boolean isEnabled() {
        // The children buttons are enabled and clickable, but the item itself is not
        return false;
    }

    @Override
    public int getLayoutResource() {
        return R.layout.suw_items_button_bar;
    }

    public void setVisible(boolean visible) {
        mVisible = visible;
    }

    public boolean isVisible() {
        return mVisible;
    }

    @Override
    public int getViewId() {
        return getId();
    }

    @Override
    public void onBindView(View view) {
        // Note: The efficiency could be improved by trying to recycle the buttons created by
        // ButtonItem
        final LinearLayout layout = (LinearLayout) view;
        layout.removeAllViews();

        for (ButtonItem buttonItem : mButtons) {
            Button button = buttonItem.createButton(layout);
            layout.addView(button);
        }

        view.setId(getViewId());
    }

    @Override
    public void addChild(ItemHierarchy child) {
        if (child instanceof ButtonItem) {
            mButtons.add((ButtonItem) child);
        } else {
            throw new UnsupportedOperationException("Cannot add non-button item to Button Bar");
        }
    }

    @Override
    public ItemHierarchy findItemById(int id) {
        if (getId() == id) {
            return this;
        }
        for (ButtonItem button : mButtons) {
            final ItemHierarchy item = button.findItemById(id);
            if (item != null) {
                return item;
            }
        }
        return null;
    }
}