libGUI
http://odp.tuxfamily.org/plantuml?hLR1SjiW4Brd9l_04JTslg27JDrcx4idKtVYP38vO44b9XWy23bsa_nxWGL9I3Xjf_L5rjkto-w-1N5L6w9DinNdPuKWTOrMXMPCefVpCsH_5-4TJ-1zXlQyvXl1q4Of4J4cYOLeWXKL5xH6nbbQJF3YQK4a5KpZbT5SbeZjcJHVoPPDKK2QXjCfujAW0poEyDWqnYZPqdQ279bsdfEOwrvnYcfcRY57xFA92QSao1W8yB-rUupNCSOG_mAruZGUeNJk2iPhJajcNaCNVHDIfas-B6tvbvUNgO5gyjn5XVOzF288U7xs5WLQRad9hhcLeDMeXM9JTyHKhM8xhNPCc-F3Oulm0nFnzI8sr2vpummOMkyxdwPeuyZC4XTU7kjkSpKL7g8BnilAZE0L_-cxQmlRaUB9Le2UVQsnBhAfZIQ5GL3tEZ52AC1mVrOcdNs63Wxh0ySXK10XDdPvzAEHXU5Azerkcdor_JNZaDse-jJ27UaEA5dRFJxjDmzfOPUV6xWsqOGUMdc7S-Zz29q6YqiziTNj12mf7YSqdjdUbYYK49oopDJq8hn4CT-IEN-31mZyZHM6oB8RRF1lOJm-4fxTmC7VoayP_BSfAPqCWYSEjGUNqKGuvnJiTB43Ly6y-OXPxSAyTqbbMNxyOw1o-Xlst2M5SxNbDrzYIJVWQ1hYHXpvmQ8vgRwpms0dEkGl1MfFScDz4xKS48nzUClbEgVZbXpMtD0npkKYAx5ro1jyNlRG7QxT2U7hpEVTtqQUbbNoMcbMQjL8YWDzh6WNfyVEHljaJuG_ZzPZvrHTobqpaDL3_wBh53rqt-k2BPIWJCyheXyJnVT4D2mZ-S3f7M5k7BFopAXFOJsoNRjrgqMMNpgXzRw7wVBu10tYPLlglio3bZfeqDBnDnMu_tzhlt_x2G5SXf-98V6A44g2OZxCPjs50mpXq_pnDPh6S7kAWwaxwxtLRHSm-9C50hdHyzU3S9bI5eoteIicgR-q_W80
@startuml
class Screen {
    + Screen()
    - visible bool
    - enabled bool
    - childs table
    - clickHandler(String eventName, String uuid, int x, int y, int button, String playerName)
    + void setVisible(bool visible)
    + void enable(bool enable)
    + bool isVisible()
    + bool isEnabled()
    + void addChild(Widget|Screen child)
    + void trigger(...)
    + void draw(bool useBuffer)
    + childs[] Widget
}
class ImageFile {
    + ImageFile(String path)
    - property[]
    - pixel[]
    + String getPixel(int x,int y)
    + void open(String path)
    + int getWidth()
    + int getHeight()
    + int getSize()
}
package widget {
    abstract class Widget {
        + Widget(int x, int y)
        - x int
        - y int
        - callback function
        - id string
        + void setPos(int x, int y)
        + void setX(int x)
        + void setY(int y)
        + void setCallback(callable callback)
        + int getX()
        + int getY()
        + int,int getPos()
        + string getId()
        + void trigger(...)
        + bool collide(int x,int y)
        + void {abstract} draw()
    }
    class Rectangle {
        + Rectangle(int x, int y, int width, int height, int color)
        - width int
        - height int
        - color int
        + void setWidht(int width)
        + void setHeight(int height)
        + void setSize(int widtg,int height)
        + void setColor(int color)
        + int getWidth()
        + int getHeight()
        + int,int getSize()
        + int getColor()
    }
    class Text {
        + Text(int x, int y, int width, int height, int color, String text)
        - text String
        - minWidth int
        - maxWitdh int
        - minHeight int
        - maxHeight int
        - color[] String
        + void setText(String text)
        + string getText()
        + void setForeground(string color)
        + string getForeground()
        + void setBackground(string color)
        + string getBackground()
    }
    class Input {
        + Input(int x, int y, int width, int height, int color, String text, [String placeHolderChar])
        - value String
        - placeHolderChar String
        + void setPlaceholder(String char)
        + void setValue(String value)
        + String getPlaceHolderChar()
        + String getValue()
    }
    class Image {
        + Image(int x, int y, String path)
        + int getWidth()
        + int getHeight()
        + int,int getSize()
        + void enable(bool enable)
        + imageData[]
    }
    Image *-- ImageFile
    Widget <|-- Image
    Widget <|-- Rectangle
    Rectangle <|-- Text
    Text <|-- Input
}
Screen o-- Widget
@enduml