Add '_with' suffix related methods to MouseArea to support closures

[jellybobbin]

This PR adds a series of on_xxx_with methods to MouseArea to support closures, to better support features such as list selection.

Example 例子

Example code

use iced::widget::{center, column, container, mouse_area, text};
use iced::{Center, Fill};

struct App {
    data: Vec<i32>,
    selected: usize,
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
enum Message {
    Selected(usize),
}

impl Default for App {
    fn default() -> Self {
        App::new()
    }
}

impl App {
    pub fn new() -> Self {
        Self {
            data: vec![100, 200, 300],
            selected: 0,
        }
    }
    fn update(&mut self, message: Message) {
        match message {
            Message::Selected(i) => self.selected = i,
        }
    }
    fn view(&self) -> iced::Element<Message> {
        let mut columns = column![];
        for (i, v) in self.data.iter().enumerate() {
            let mut item = center(text(v.to_string()).align_x(Center)).width(Fill);
            if i == self.selected {
                item = item.style(container::rounded_box)
            }
            columns = columns.push(mouse_area(item).on_release_with(move || Message::Selected(i)));
        }

        columns.spacing(2).into()
    }
}

fn main() {
    iced::application("Mouse Area", App::update, App::view)
        .window_size((200.0, 100.0))
        .centered()
        .run()
        .unwrap();
}