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use crate::{ messenger::MessageData, pre_hooks, widget::{ component::interactive::navigation::{use_nav_scroll_view, NavJump, NavScroll, NavSignal}, context::{WidgetContext, WidgetMountOrChangeContext}, utils::Vec2, WidgetId, WidgetIdOrRef, }, }; use serde::{Deserialize, Serialize}; fn is_zero(v: &Vec2) -> bool { v.x.abs() < 1.0e-6 && v.y.abs() < 1.0e-6 } #[derive(Debug, Default, Clone, Serialize, Deserialize)] pub struct ScrollViewState { #[serde(default)] pub value: Vec2, #[serde(default)] pub size_factor: Vec2, } implement_props_data!(ScrollViewState); #[derive(Debug, Clone, Serialize, Deserialize)] pub struct ScrollViewRange { #[serde(default)] #[serde(skip_serializing_if = "is_zero")] pub from: Vec2, #[serde(default)] #[serde(skip_serializing_if = "is_zero")] pub to: Vec2, } implement_props_data!(ScrollViewRange); impl Default for ScrollViewRange { fn default() -> Self { Self { from: Vec2 { x: 0.0, y: 0.0 }, to: Vec2 { x: 1.0, y: 1.0 }, } } } #[derive(Debug, Default, Clone, Serialize, Deserialize)] pub struct ScrollViewNotifyProps( #[serde(default)] #[serde(skip_serializing_if = "WidgetIdOrRef::is_none")] pub WidgetIdOrRef, ); implement_props_data!(ScrollViewNotifyProps); #[derive(Debug, Clone)] pub struct ScrollViewNotifyMessage { pub sender: WidgetId, pub state: ScrollViewState, } implement_message_data!(ScrollViewNotifyMessage); pub fn use_scroll_view_notified_state(context: &mut WidgetContext) { context.life_cycle.change(|context| { for msg in context.messenger.messages { if let Some(msg) = msg.as_any().downcast_ref::<ScrollViewNotifyMessage>() { drop(context.state.write_with(msg.state.clone())); } } }); } #[pre_hooks(use_nav_scroll_view)] pub fn use_scroll_view(context: &mut WidgetContext) { fn notify<T>(context: &WidgetMountOrChangeContext, data: T) where T: 'static + MessageData, { if let Ok(notify) = context.props.read::<ScrollViewNotifyProps>() { if let Some(to) = notify.0.read() { context.messenger.write(to, data); } } } context.life_cycle.mount(|context| { notify( &context, ScrollViewNotifyMessage { sender: context.id.to_owned(), state: ScrollViewState::default(), }, ); drop(context.state.write_with(ScrollViewState::default())); }); context.life_cycle.change(|context| { let mut data = context.state.read_cloned_or_default::<ScrollViewState>(); let range = context.props.read::<ScrollViewRange>(); let mut dirty = false; for msg in context.messenger.messages { if let Some(NavSignal::Jump(NavJump::Scroll(NavScroll::Change( value, factor, relative, )))) = msg.as_any().downcast_ref() { if *relative { data.value.x += value.x; data.value.y += value.y; } else { data.value = *value; } if let Ok(range) = &range { data.value.x = data.value.x.max(range.from.x).min(range.to.x); data.value.y = data.value.y.max(range.from.y).min(range.to.y); } data.size_factor = *factor; dirty = true; } } if dirty { notify( &context, ScrollViewNotifyMessage { sender: context.id.to_owned(), state: data.clone(), }, ); drop(context.state.write_with(data)); } }); }