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use crate::common::*;
use crate::scroll_container::Scroll;
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum ScrollDirection {
Horizontal,
Vertical,
}
pub struct Scrollbar {
front: Entity,
pub scroll: Scroll,
direction: ScrollDirection,
position: f32,
pub pos_ratio: f32,
pressed_x: f32,
pressed_y: f32,
moving: bool,
on_scroll: Option<Box<dyn Fn(&mut Self, &mut State, Entity)>>,
}
impl Scrollbar {
pub fn new(direction: ScrollDirection) -> Self {
Scrollbar {
front: Entity::null(),
// scroll_pos: 0.0,
// scroll_size: 0.0,
// overflow: 0.0,
scroll: Scroll::default(),
direction,
position: 0.0,
pos_ratio: 0.2,
pressed_x: 0.0,
pressed_y: 0.0,
moving: false,
on_scroll: None,
}
}
pub fn on_scroll<F>(mut self, callback: F) -> Self
where F: 'static + Fn(&mut Self, &mut State, Entity)
{
self.on_scroll = Some(Box::new(callback));
self
}
// pub fn set_posx(&self, state: &mut State, value: f32) {
// //self.back.set_left(state, value);
// self.front.set_left(state, Units::Pixels(value));
// }
// pub fn on_scroll<F>(mut self, pos: F) -> Self
// where
// F: 'static + Fn(f32) -> Message,
// {
// self.on_scroll = Some(Box::new(pos));
// self
// }
}
impl Widget for Scrollbar {
type Ret = Entity;
type Data = Scroll;
fn on_build(&mut self, state: &mut State, entity: Entity) -> Self::Ret {
self.front = Element::new().build(state, entity, |builder|
builder
//.set_background_color(Color::rgb(50, 50, 100))
.class("front")
);
self.front
.set_width(state, Units::Percentage(100.0))
.set_height(state, Units::Percentage(100.0));
entity.set_element(state, "scrollbar")
}
fn on_update(&mut self, state: &mut State, _entity: Entity, data: &Self::Data) {
// self.scroll_pos = data.scroll_pos;
// self.scroll_size = data.scroll_size;
// self.overflow = data.overflow;
self.scroll = *data;
let overflow2 = 1.0 - (1.0 / (1.0 - self.scroll.overflow));
if self.direction == ScrollDirection::Vertical {
self.front.set_top(state, Percentage(self.scroll.scroll_pos * overflow2 * 100.0));
state
.style
.height
.insert(self.front, Percentage(self.scroll.scroll_size * 100.0)).expect("Failed to set height of scrollbar front");
} else {
self.front.set_left(state, Percentage(self.scroll.scroll_pos * overflow2 * 100.0));
state
.style
.width
.insert(self.front, Percentage(self.scroll.scroll_size * 100.0)).expect("Failed to set width of scrollbar front");
}
}
fn on_event(&mut self, state: &mut State, entity: Entity, event: &mut Event) {
/*
if let Some(layout_event) = event.message.downcast::<LayoutEvent>() {
match layout_event {
LayoutEvent::Relayout => {
if *id != entity {
println!("LAYOUT EVENT");
let scroll = state
.style
.scroll
.get(self.entity)
.cloned()
.unwrap_or_default();
self.front
.set_top(state, Units::Percentage(scroll.y * (1.0 - scroll.h)));
self.front.set_height(state, Units::Percentage(scroll.h));
if scroll.h == 1.0 {
state.style.enabled.set(entity, false);
} else {
state.style.enabled.set(entity, true);
}
state.insert_event(
Event::new(StyleEvent::Restyle).target(state.root),
);
state.insert_event(
Event::new(LayoutEvent::Relayout).target(entity),
);
}
}
}
}
*/
if let Some(window_event) = event.message.downcast::<WindowEvent>() {
match window_event {
// When a relayout occurs, determine the new height of the scroll bar
WindowEvent::Relayout => {}
WindowEvent::MouseScroll(x, y) => {
let overflow2 = 1.0 - (1.0 / (1.0 - self.scroll.overflow));
// TODO - Need a way to configure this
if self.direction == ScrollDirection::Vertical {
self.scroll.scroll_pos += (30.0 * *y) / (state.data.get_height(entity) * self.scroll.overflow);
} else {
self.scroll.scroll_pos += (30.0 * -*x) / (state.data.get_width(entity) * self.scroll.overflow);
}
if self.scroll.scroll_pos < 0.0 {
self.scroll.scroll_pos = 0.0;
}
if self.scroll.scroll_pos > 1.0 {
self.scroll.scroll_pos = 1.0;
}
if self.direction == ScrollDirection::Vertical {
self.front.set_top(state, Units::Percentage(self.scroll.scroll_pos * overflow2 * 100.0));
} else {
self.front.set_left(state, Units::Percentage(self.scroll.scroll_pos * overflow2 * 100.0));
}
if let Some(callback) = self.on_scroll.take() {
(callback)(self, state, entity);
self.on_scroll = Some(callback);
}
// state.insert_event(
// Event::new(ScrollEvent::Scroll(self.scroll_pos, self.scroll_size, self.overflow)).target(entity).origin(entity),
// );
//event.consume();
}
WindowEvent::MouseDown(button) => match button {
MouseButton::Left => {
if event.target == self.front {
self.pressed_x = state.mouse.cursorx;
self.pressed_y = state.mouse.cursory;
self.moving = true;
self.position = self.scroll.scroll_pos;
state.capture(entity);
}
}
_ => {}
},
WindowEvent::MouseUp(button) => match button {
MouseButton::Left => {
if event.target == entity {
self.moving = false;
state.release(entity);
}
}
_ => {}
},
WindowEvent::MouseMove(x, y) => {
if self.moving {
let (dist, scroll_bar_overflow) = if self.direction == ScrollDirection::Vertical {
(*y - self.pressed_y, state.data.get_height(entity)
- state.data.get_height(self.front))
} else {
(*x - self.pressed_x, state.data.get_width(entity)
- state.data.get_width(self.front))
};
if scroll_bar_overflow == 0.0 {
return;
}
let ratio = dist / scroll_bar_overflow;
let r = self.position + ratio;
self.scroll.scroll_pos = r;
if self.scroll.scroll_pos < 0.0 {
self.scroll.scroll_pos = 0.0;
}
if self.scroll.scroll_pos > 1.0 {
self.scroll.scroll_pos = 1.0;
}
let overflow2 = 1.0 - (1.0 / (1.0 - self.scroll.overflow));
if self.direction == ScrollDirection::Vertical {
self.front.set_top(state, Units::Percentage(self.scroll.scroll_pos * overflow2 * 100.0));
} else {
self.front.set_left(state, Units::Percentage(self.scroll.scroll_pos * overflow2 * 100.0));
}
if let Some(callback) = self.on_scroll.take() {
(callback)(self, state, entity);
self.on_scroll = Some(callback);
}
state.insert_event(Event::new(WindowEvent::Restyle));
state.insert_event(Event::new(WindowEvent::Relayout).target(Entity::root()));
state.insert_event(Event::new(WindowEvent::Redraw));
}
}
_ => {}
}
}
}
}