BookMenu.c

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class BookMenu extends UIScriptedMenu
{
    protected TextWidget m_author;
    protected TextWidget m_title;
    protected TextWidget m_page;
    protected HtmlWidget m_content;
    protected float m_page_height;
    protected float m_content_total_height;
    protected float m_content_pos;
 
    override Widget Init()
    {
        layoutRoot = GetGame().GetWorkspace().CreateWidgets("gui/layouts/day_z_book.layout");
        Class.CastTo(m_content, layoutRoot.FindAnyWidget("HtmlWidget"));
        Class.CastTo(m_author, layoutRoot.FindAnyWidget("Author")); 
        Class.CastTo(m_title, layoutRoot.FindAnyWidget("Title"));
        Class.CastTo(m_page, layoutRoot.FindAnyWidget("Page"));
        
        float width;
        m_content.GetScreenSize(width, m_page_height);
        return layoutRoot;
    }
    
    void ReadBook(InventoryItem book)
    {
        m_content.LoadFile( book.ConfigGetString("file") );
        m_author.SetText( book.ConfigGetString("author") );
        m_title.SetText( book.ConfigGetString("title") );
        m_content_total_height = m_content.GetContentHeight();
        m_content_pos = 0;
        NextPrevPage(false);
    }
 
    override bool OnClick(Widget w, int x, int y, int button)
    {
        super.OnClick(w, x, y, button);
 
        switch (w.GetUserID())
        {
            case IDC_BOOK_VIEWER_PREV:
                NextPrevPage(false);
                return true;
            case IDC_BOOK_VIEWER_NEXT:
                NextPrevPage(true);
                return true;
            case IDC_CANCEL:
                Close();
                return true;
        }
 
        return false;
    }
    
    void NextPrevPage(bool next)
    {
        if (next)
        {
            m_content_pos   = m_content_pos + m_page_height;
        }
        else
        {
            m_content_pos   = m_content_pos - m_page_height;
        }
        
        float maxOffset = 0;
        if (m_content_total_height > m_page_height)
        {
            maxOffset = m_content_total_height - m_page_height;
        }       
        
        if (m_content_pos < 0)
        {
            m_content_pos = 0;
        }
 
        if (m_content_pos > maxOffset)
        {
            m_content_pos = maxOffset;
        }
        
        m_content.SetContentOffset(m_content_pos, true);
        
        float pagesTotal = Math.Ceil(m_content_total_height / m_page_height);
        float currPage = Math.Round(m_content_pos / m_page_height) + 1;
 
        m_page.SetText( currPage.ToString() + " / " + pagesTotal.ToString() );
    }
}