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//! 
//! A module for describing Mouse state.
//!
//! The `Ui` will continuously maintain the latest Mouse state, necessary for widget logic.
//!

use position::Point;

/// Represents the current state of a mouse button.
#[derive(Clone, Copy, Debug)]
pub enum ButtonState {
    /// The mouse is currently up.
    Up,
    /// The mouse is currently down (pressed).
    Down,
}

/// Represents the current state of the Mouse.
#[derive(Copy, Clone, Debug)]
pub struct Mouse {
    /// Position of the mouse cursor.
    pub xy: Point,
    /// Left mouse button state.
    pub left: ButtonState,
    /// Middle mouse button state.
    pub middle: ButtonState,
    /// Right mouse button state.
    pub right: ButtonState,
    /// Unknown button state.
    pub unknown: ButtonState,
}

impl Mouse {

    /// Constructor for a Mouse struct.
    pub fn new(xy: Point,
               left: ButtonState,
               middle: ButtonState,
               right: ButtonState) -> Mouse {
        Mouse { xy: xy, left: left, middle: middle, right: right, unknown: ButtonState::Up }
    }

    /// Return the mouse state with its position relative to the given position.
    pub fn relative_to(self, xy: Point) -> Mouse {
        Mouse { xy: ::vecmath::vec2_sub(self.xy, xy), ..self }
    }

}