Martin Milata
2 years ago
parent
efe25a6ab4
commit
4eefaffac9
@ -0,0 +1,138 @@
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use crate::ui::{
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component::{Component, Event, EventCtx, Never},
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display,
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geometry::{LinearPlacement, Offset, Rect},
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};
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use super::theme;
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pub struct ScrollBar {
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area: Rect,
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layout: LinearPlacement,
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arrows: bool,
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pub page_count: usize,
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pub active_page: usize,
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}
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impl ScrollBar {
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pub const DOT_SIZE: i32 = 6;
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/// Edge to edge.
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const DOT_INTERVAL: i32 = 6;
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/// Edge of last dot to center of arrow icon.
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const ARROW_SPACE: i32 = 26;
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const ICON_UP: &'static [u8] = include_res!("model_tt/res/scroll-up.toif");
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const ICON_DOWN: &'static [u8] = include_res!("model_tt/res/scroll-down.toif");
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fn new(layout: LinearPlacement) -> Self {
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Self {
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area: Rect::zero(),
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layout: layout.align_at_center().with_spacing(Self::DOT_INTERVAL),
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arrows: false,
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page_count: 0,
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active_page: 0,
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}
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}
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pub fn vertical() -> Self {
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Self::new(LinearPlacement::vertical())
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}
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pub fn horizontal() -> Self {
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Self::new(LinearPlacement::horizontal())
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}
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pub fn with_arrows(mut self) -> Self {
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self.arrows = true;
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self
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}
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pub fn set_count_and_active_page(&mut self, page_count: usize, active_page: usize) {
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self.page_count = page_count;
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self.active_page = active_page;
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}
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pub fn has_pages(&self) -> bool {
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self.page_count > 1
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}
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pub fn has_next_page(&self) -> bool {
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self.active_page < self.page_count - 1
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}
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pub fn has_previous_page(&self) -> bool {
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self.active_page > 0
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}
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pub fn go_to_next_page(&mut self) {
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self.go_to(self.active_page.saturating_add(1).min(self.page_count - 1));
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}
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pub fn go_to_previous_page(&mut self) {
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self.go_to(self.active_page.saturating_sub(1));
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}
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pub fn go_to(&mut self, active_page: usize) {
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self.active_page = active_page;
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}
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}
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impl Component for ScrollBar {
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type Msg = Never;
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fn event(&mut self, _ctx: &mut EventCtx, _event: Event) -> Option<Self::Msg> {
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None
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}
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fn paint(&mut self) {
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let mut i = 0;
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let mut top = None;
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let mut display_icon = |top_left| {
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let icon = if i == self.active_page {
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theme::DOT_ACTIVE
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} else {
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theme::DOT_INACTIVE
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};
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display::icon_top_left(top_left, icon, theme::FG, theme::BG);
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i += 1;
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top.get_or_insert(top_left.x);
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};
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self.layout.arrange_uniform(
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self.area,
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self.page_count,
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Offset::new(Self::DOT_SIZE, Self::DOT_SIZE),
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&mut display_icon,
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);
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if self.arrows {
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let arrow_distance = self.area.center().x - top.unwrap_or(0) + Self::ARROW_SPACE;
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let offset = Offset::on_axis(self.layout.axis, arrow_distance);
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if self.has_previous_page() {
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display::icon(
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self.area.center() - offset,
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Self::ICON_UP,
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theme::FG,
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theme::BG,
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);
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}
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if self.has_next_page() {
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display::icon(
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self.area.center() + offset,
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Self::ICON_DOWN,
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theme::FG,
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theme::BG,
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);
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}
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}
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}
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fn place(&mut self, bounds: Rect) -> Rect {
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self.area = bounds;
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bounds
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}
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fn bounds(&self, sink: &mut dyn FnMut(Rect)) {
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sink(self.area);
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}
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}
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