DropdownPrefab.c

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class DropdownPrefab extends ScriptedWidgetEventHandler
{
    protected Widget                m_Root;
    protected Widget                m_Parent;
    protected ScrollWidget          m_Scroller;
    protected Widget                m_ContentContainer;
    protected ref array<Widget>     m_Content = new array<Widget>;
    
    protected Widget                m_Button;
    protected Widget                m_Holder;
    protected TextWidget            m_Text;
    protected ImageWidget           m_ImageExpand;
    protected ImageWidget           m_ImageCollapse;
    
    protected bool                  m_IsExpanded;
    ref ScriptInvoker               m_OnSelectItem  = new ScriptInvoker();
 
    void DropdownPrefab( Widget root, string text = "" )
    {
        m_Parent = root;
        m_Root              = GetGame().GetWorkspace().CreateWidgets( "gui/layouts/new_ui/dropdown_prefab/dropdown_prefab.layout", root );
        
        m_Scroller          = ScrollWidget.Cast( m_Root.FindAnyWidget( "dropdown_container" ) );
        m_ContentContainer  = m_Root.FindAnyWidget( "dropdown_content" );
        m_Text              = TextWidget.Cast( m_Root.FindAnyWidget( "dropdown_text" ) );
        m_Holder            = m_Root.FindAnyWidget( "holder" );
        SetText( text );
        
        m_Button            = m_Root.FindAnyWidget( "dropdown_selector_button" );
        m_ImageExpand       = ImageWidget.Cast( m_Root.FindAnyWidget( "expand_image" ) );
        m_ImageCollapse     = ImageWidget.Cast( m_Root.FindAnyWidget( "collapse_image" ) );
        
        m_Root.SetHandler( this );
        
        RefreshContent();
    }
    
    void RefreshContent()
    {
        Widget child = m_ContentContainer.GetChildren();
        while( child )
        {
            if( m_Content.Find( child ) > -1 )
            {
                m_Content.Insert( child );
            }
        }
        
        m_ContentContainer.Update();
        m_Root.Update();
        
        float x, y;
        m_ContentContainer.GetScreenSize( x, y );
        if( y > m_Scroller.GetContentHeight() )
        {
            m_Scroller.SetAlpha( 1 );
        }
        else
        {
            m_Scroller.SetAlpha( 0 );
        }
    }
    
    int AddElement( string text, Widget content = null )
    {
        ButtonWidget element = ButtonWidget.Cast( GetGame().GetWorkspace().CreateWidgets( "gui/layouts/new_ui/dropdown_prefab/dropdown_element.layout", m_ContentContainer ) );
        RichTextWidget textWidget = RichTextWidget.Cast(element.FindAnyWidget("dropdown_element_text"));
        textWidget.SetText( text );
        
        if( content )
        {
            element.AddChild( content, false );
        }
        m_ContentContainer.Update();
        textWidget.Update();
        m_Root.Update();
        element.Update();
        
        m_Content.Insert( element );
        return m_Content.Count() - 1;
    }
    
    void RemoveElement( int index )
    {
        if( 0 < index && index < m_Content.Count() )
        {
            delete m_Content.Get( index );
            m_ContentContainer.Update();
            m_Root.Update();
            m_Parent.Update();
        }
    }
    
    void Close()
    {
        if( m_IsExpanded )
        {
            m_IsExpanded = !m_IsExpanded;
            m_Scroller.Show( m_IsExpanded );
            m_ImageExpand.Show( !m_IsExpanded );
            m_ImageCollapse.Show( m_IsExpanded );
            
            m_Root.Update();
            m_Parent.Update();
        }
    }
    
    void SetText( string text )
    {
        m_Text.SetText( text );
    }
    
    override bool OnClick( Widget w, int x, int y, int button )
    {
        int index = m_Content.Find( w );
        if ( index > -1 )
        {
            m_OnSelectItem.Invoke( index );
            m_IsExpanded = false;
            m_Scroller.Show( m_IsExpanded );
            m_ImageExpand.Show( !m_IsExpanded );
            m_ImageCollapse.Show( m_IsExpanded );
            return true;
        }
        return false;
    }
    
    override bool OnMouseButtonDown( Widget w, int x, int y, int button )
    {
        if ( (w == m_Button || w == m_Text || w == m_Holder) && button == MouseState.LEFT )
        {
            m_IsExpanded = !m_IsExpanded;
            m_Scroller.Show( m_IsExpanded );
            m_ImageExpand.Show( !m_IsExpanded );
            m_ImageCollapse.Show( m_IsExpanded );
            
            m_Root.Update();
            m_Parent.Update();
            m_ContentContainer.Update();
            
            return true;
        }
        return false;
    }
}