modules/midp-lcdui/src/main/java/javax/microedition/lcdui/__ExecDisplayMenuItemActivate__.java

   1 // -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
   2 // ---------------------------------------------------------------------------
   3 // Multi-Phasic Applications: SquirrelJME
   4 //     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
   5 // ---------------------------------------------------------------------------
   6 // SquirrelJME is under the Mozilla Public License Version 2.0.
   7 // See license.mkd for licensing and copyright information.
   8 // ---------------------------------------------------------------------------
   9
  10 package javax.microedition.lcdui;
  11
  12 import cc.squirreljme.jvm.mle.scritchui.brackets.ScritchMenuKindBracket;
  13 import cc.squirreljme.jvm.mle.scritchui.brackets.ScritchWindowBracket;
  14 import cc.squirreljme.jvm.mle.scritchui.callbacks.ScritchMenuItemActivateListener;
  15 import cc.squirreljme.runtime.lcdui.scritchui.DisplayState;
  16 import cc.squirreljme.runtime.lcdui.scritchui.DisplayableState;
  17 import cc.squirreljme.runtime.lcdui.scritchui.MenuActionApplicable;
  18 import cc.squirreljme.runtime.lcdui.scritchui.MenuActionNodeOnly;
  19 import cc.squirreljme.runtime.lcdui.scritchui.MenuActionTree;
  20 import cc.squirreljme.runtime.lcdui.scritchui.MenuActionTreeLeaf;
  21
  22 /**
  23  * Handles activation of menu items.
  24  *
  25  * @since 2024/07/30
  26  */
  27 class __ExecDisplayMenuItemActivate__
  28         implements ScritchMenuItemActivateListener
  29 {
  30         /** The display state. */
  31         private final DisplayState _state;
  32
  33         /**
  34          * Initializes the handler.
  35          *
  36          * @param __state The display state.
  37          * @throws NullPointerException On null arguments.
  38          * @since 2024/07/30
  39          */
  40         __ExecDisplayMenuItemActivate__(DisplayState __state)
  41                 throws NullPointerException
  42         {
  43                 if (__state == null)
  44                         throw new NullPointerException("NARG");
  45
  46                 this._state = __state;
  47         }
  48
  49         /**
  50          * {@inheritDoc}
  51          * @since 2024/07/30
  52          */
  53         @Override
  54         public void menuItemActivate(ScritchWindowBracket __window,
  55                 ScritchMenuKindBracket __menuItem)
  56         {
  57                 if (__window == null || __menuItem == null)
  58                         throw new NullPointerException("NARG");
  59
  60                 // Get the current displayable, we will be looking in its menu!
  61                 Display display = this._state.display();
  62                 DisplayableState displayableState = this._state.current();
  63                 if (displayableState == null)
  64                         return;
  65
  66                 // Get actual displayable
  67                 Displayable current = displayableState.displayable();
  68                 if (current == null)
  69                         return;
  70
  71                 // Find the leaf that belongs to this item
  72                 MenuActionTree tree = MenuActionNodeOnly.rootTree(current);
  73                 MenuActionTreeLeaf leaf = tree.find(__menuItem);
  74
  75                 // Not found? Just ignore then
  76                 if (leaf == null)
  77                         return;
  78
  79                 // Get the MIDP for this
  80                 MenuActionApplicable node = leaf.owner();
  81
  82                 // If not a command, ignore
  83                 if (!(node instanceof Command))
  84                         return;
  85
  86                 // If there is no command listener, then do not bother
  87                 CommandListener listener = current.__getCommandListener();
  88                 if (listener == null)
  89                         return;
  90
  91                 // Execute
  92                 listener.commandAction((Command)node, current);
  93         }
  94 }