web-sys-main-loop 0.1.8

Provides a main loop (or game loop) for web_sys windows
Documentation 
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// Copyright 2024 arongeo
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// The possible buttons that can be pressed on a mouse.
#[derive(PartialEq, Eq)]
pub enum MouseButton {
    None,
    Left,
    Right,
    Scroll,
    Misc1,
    Misc2,
}

/// Contains the state of the mouse
/// in the current frame
#[derive(Copy, Clone)]
pub struct MouseState {
    pub(crate) buttons_pressed: u8,
    pub(crate) position: (i32, i32),
    pub(crate) movement: (i32, i32),
    pub(crate) offset: (i32, i32),
}

impl MouseState {
    pub(crate) fn new() -> Self {
        Self {
            buttons_pressed: 0,
            position: (0, 0),
            movement: (0, 0),
            offset: (0, 0),
        }
    }

    /// Gets the currently pressed buttons on the mouse
    pub fn get_pressed_buttons(&self) -> Option<Vec<MouseButton>> {
        if self.buttons_pressed == 0 {
            return None;
        }

        let mut iter_num = 0;
        let mut buttons_pressed = self.buttons_pressed;
        let mut buttons = Vec::new();

        while iter_num < 5 {
            if (buttons_pressed & (1 << iter_num)) == 1 {
                buttons.push(match iter_num {
                    0 => MouseButton::Left,
                    1 => MouseButton::Right,
                    2 => MouseButton::Scroll,
                    3 => MouseButton::Misc1,
                    4 => MouseButton::Misc2,
                    _ => MouseButton::None,
                });
            }

            buttons_pressed /= 2;
            iter_num += 1;
        }

        return Some(buttons);
    }

    /// Gets the position (X, Y) of the cursor in the web_sys window
    ///
    /// [MDN Web Docs clientX property](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientX)
    ///
    /// [MDN Web Docs clientY property](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientY)
    pub fn get_position(&self) -> (i32, i32) {
        self.position
    }

    /// Gets the movement (X, Y) of the cursor between the
    /// last mouse event and the current one.
    ///
    /// [MDN Web Docs movementX property](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/movementX)
    ///
    /// [MDN Web Docs movementY property](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/movementX)
    pub fn get_movement(&self) -> (i32, i32) {
        self.movement
    }

    /// Gets the offset (X, Y) between of the cursor between the
    /// event which caused it and the padding edge of the
    /// target node.
    ///
    /// [MDN Web Docs offsetX property](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/offsetX)
    ///
    /// [MDN Web Docs offsetY property](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/offsetY)
    pub fn get_offset(&self) -> (i32, i32) {
        self.offset
    }

    pub(crate) fn copy(&self) -> Self {
        Self {
            buttons_pressed: self.buttons_pressed,
            position: self.position,
            offset: self.offset,
            movement: self.movement,
        }
    }
}