SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package javax.microedition.lcdui;

import cc.squirreljme.jvm.mle.brackets.UIItemBracket;
import cc.squirreljme.jvm.mle.constants.UIItemType;
import cc.squirreljme.jvm.mle.constants.UIWidgetProperty;
import cc.squirreljme.runtime.lcdui.SerializedEvent;
import cc.squirreljme.runtime.lcdui.mle.DisplayWidget;
import cc.squirreljme.runtime.lcdui.mle.StaticDisplayState;
import cc.squirreljme.runtime.lcdui.mle.UIBackend;
import cc.squirreljme.runtime.lcdui.mle.UIBackendFactory;
import java.lang.ref.Reference;
import java.lang.ref.WeakReference;
import org.jetbrains.annotations.Async;

/**
 * This is a widget that maps to a command or menu, for it to be displayed.
 *
 * @since 2020/09/27
 */
@Deprecated
final class __CommandWidget__
    implements DisplayWidget
{
    /** The action this maps to. */
    protected final Command action;
    
    /** The owning displayable. */
    protected final Reference<Displayable> owner;
    
    /** The user interface item to use. */
    final UIItemBracket _uiItem;
    
    /**
     * Initializes the command widget.
     * 
     * @param __owner The owner of this widget.
     * @param __action The action this maps to.
     * @throws NullPointerException On null arguments.
     * @since 2020/09/27
     */
    @Deprecated
    __CommandWidget__(Displayable __owner, Command __action)
        throws NullPointerException
    {
        if (__owner == null || __action == null)
            throw new NullPointerException("NARG");
        
        this.action = __action;
        this.owner = new WeakReference<>(__owner);
        
        UIBackend backend = UIBackendFactory.getInstance(true);

        // Setup and register new item
        UIItemBracket item = backend.itemNew(UIItemType.BUTTON);
        StaticDisplayState.register(this, item);
        
        this._uiItem = item;
        
        // Register with the command to get updates
        __action.__register(this);
        
        // Perform an update of the used text/images
        this.__update();
    }
    
    /**
     * Activates the command.
     * 
     * @since 2020/09/27
     */
    @Deprecated
    @SerializedEvent
    @Async.Execute
    final void __activate()
    {
        // Do nothing if the owner is gone.
        Displayable owner = this.owner.get();
        if (owner == null)
            return;
        
        // Do nothing if there is no command listener
        CommandListener listener = owner._cmdListener;
        if (listener == null)
            return;
        
        // Perform the command's action
        listener.commandAction(this.action, owner);
    }
    
    /**
     * Updates the state of the widget.
     * 
     * @since 2021/11/30
     */
    @Deprecated
    final void __update()
    {
        // Set item text
        UIBackend backend = UIBackendFactory.getInstance(true);
        backend.widgetProperty(this._uiItem, UIWidgetProperty.STRING_LABEL,
            0, this.action.__getLabel());
    }
}