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<h1 class="page">customcontrols</h1>
<div class="sect1">
<h2 id="creating-custom-controls"><a class="anchor" href="#creating-custom-controls"></a>Creating Custom Controls</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In this section, I&#8217;m going to walk you through creating a custom control and hopefully pass along a few tip and help standardize how controls are built.  This way (if you feel so inclined) you can share your controls with other and all will know exactly how to use your control.</p>
</div>
<div class="sect2">
<h3 id="a-reusable-contextual-menu"><a class="anchor" href="#a-reusable-contextual-menu"></a>A Reusable Contextual Menu</h3>
<div class="paragraph">
<p>We&#8217;re going to be building a reusable contextual right-click menu that will:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>lock and unlock certain features of a standard window/panel</p>
</li>
<li>
<p>Allow you to add/remove menu items specific to each window as it is called.</p>
</li>
</ul>
</div>
<div class="sect3">
<h4 id="step-1-adding-the-framework-for-the-new-class"><a class="anchor" href="#step-1-adding-the-framework-for-the-new-class"></a>STEP 1: Adding the framework for the new class.</h4>
<div class="paragraph">
<p>First, we&#8217;ll set up the class and add the three standard constructors.  We&#8217;ll be using the default Menu style information.  The class will remain abstract to leverage the existing callback method of the super class Menu.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public abstract class ContextualMenu extends Menu {
    public ContextualMenu(Screen screen, String UID, Vector2f position, boolean isScrollable) {
        this(screen, UID, position,
            screen.getStyle("Menu").getVector2f("defaultSize"),
            screen.getStyle("Menu").getVector4f("resizeBorders"),
            screen.getStyle("Menu").getString("defaultImg"),
            isScrollable
        );
    }

    public ContextualMenu(Screen screen, String UID, Vector2f position, Vector2f dimensions,
            boolean isScrollable) {
        this(screen, UID, position, dimensions,
            screen.getStyle("Menu").getVector4f("resizeBorders"),
            screen.getStyle("Menu").getString("defaultImg"),
            isScrollable
        );
    }
    public ContextualMenu(Screen screen, String UID, Vector2f position, Vector2f dimensions,
            Vector4f resizeBorders, String defaultImg, boolean isScrollable) {
        // Call the super class to construct our basic menu
        super(screen, UID, position, dimensions, resizeBorders, defaultImg, false);
    }
}</code></pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="step-2-adding-a-public-method-for-building-standard-options"><a class="anchor" href="#step-2-adding-a-public-method-for-building-standard-options"></a>STEP 2: Adding a public method for building standard options</h4>
<div class="paragraph">
<p>This method will be used by calling windows to ensure the menu starts with only the default options.  If the particular calling window needs extra options, we can add them once this method is called.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public void resetMenuOptions() {
    // First, clear the current menuItems
    getMenuItems().clear();
    // Now add the default items
    /** Parameters:
      * String caption
      * Object value - We'll store a String that gives us a hint as to the menu item function
      * Menu subMenu - null, because there isn't one
      * boolean isToggleItem - adds a CheckBox to the menu item
      */
    addMenuItem("Lock window position", "position", null, true);
    addMenuItem("Lock window size", "dimensions", null, true);
    addMenuItem("Lock current alpha setting", "alpha", null, true);
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect2">
<h3 id="adding-our-new-control-to-the-screen"><a class="anchor" href="#adding-our-new-control-to-the-screen"></a>Adding Our New Control to the Screen</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">// Create a single instance of the reusable contextual menu
ContextualMenu rcMenu = new ContextualMenu(screen, "rcMenu", Vector2f.ZERO) {
    // Override the abstract event method
    @Override
    public void onMenuItemClicked(int index, Object value, boolean isToggled) {
        // Now we will pass this through to our calling window.
        getCallerElement().setOption((String)value, isToggled);
    }
};
rcMenu.resetMenuOptions();
screen.add(rcMenu);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="extending-the-window-class-to-utilize-our-control"><a class="anchor" href="#extending-the-window-class-to-utilize-our-control"></a>Extending the Window Class to Utilize Our Control</h3>
<div class="sect3">
<h4 id="step-1-extend-the-window-class-and-add-a-few-methods"><a class="anchor" href="#step-1-extend-the-window-class-and-add-a-few-methods"></a>STEP 1: Extend the window class and add a few methods</h4>
<div class="paragraph">
<p>We need to extend the window class in order to add right-click event handling and handle the setOption() method call from our ContextualMenu class.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public abstract class ContextualWindow extends Window implements MouseButtonListener {
    // Add the 3 standard constructors from the Window class and rename them

    // implement all abstract methods from the listener and add the following to right mouse button up:
    @Override
    public void onRightMouseReleased(MouseButtonEvent evt) {
        ContextualMenu rcMenu = screen.getElementById("rcMenu");
        // set the toggle state for each of the options
        rcMenu.getMenuItem(0).setIsToggled(getIsMovable());
        rcMenu.getMenuItem(1).setIsToggled(getIsResizable());
        rcMenu.getMenuItem(2).setIsToggled(getIgnoreGlobalAlpha());
        // Show the menu
        rcMenu.showMenu(this, screen.getMouseXY().x, screen.getMouseXY().y);
    }

    // Add the setOption method tohandle menu item events
    public void setOption(String value, boolean isToggled) {
        if (value.equals("position")) {
            setIsMovable(isToggled);
        } else if (value.equals("dimensions")) {
            setIsResizable(isToggled);
        } else if (value.equals("alpha")) {
            setIgnoreGlobalAlpha(isToggled);
        }
    }
}</code></pre>
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