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237 lines
6.6 KiB
237 lines
6.6 KiB
use crate::ui::{
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component::{
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paginated::{Page, PageMsg},
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Component, Event, EventCtx, Never,
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},
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display,
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geometry::{Offset, Point, Rect},
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};
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use super::{theme, Button, ButtonMsg, ButtonPos};
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pub struct ButtonPage<T> {
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scrollbar: ScrollBar,
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prev: Button<&'static str>,
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next: Button<&'static str>,
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cancel: Button<&'static str>,
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confirm: Button<&'static str>,
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page: T,
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}
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impl<T> ButtonPage<T> {
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fn areas(area: Rect) -> (Rect, Rect, Rect) {
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let button_height = theme::FONT_BOLD.line_height() + 2;
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let (content_area, button_area) = area.hsplit(-button_height);
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let (content_area, scrollbar_area) = content_area.vsplit(-ScrollBar::WIDTH);
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let (content_area, _) = content_area.hsplit(-1);
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(content_area, scrollbar_area, button_area)
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}
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}
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impl<T> Page for ButtonPage<T> {
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type Content = T;
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fn new(area: Rect, page: T, page_count: usize, active_page: usize) -> Self {
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let (_content_area, scrollbar_area, button_area) = Self::areas(area);
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let scrollbar = ScrollBar::vertical_right(scrollbar_area, page_count, active_page);
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let prev = Button::with_text(button_area, ButtonPos::Left, "BACK", theme::button_cancel());
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let next = Button::with_text(
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button_area,
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ButtonPos::Right,
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"NEXT",
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theme::button_default(),
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);
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let cancel = Button::with_text(
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button_area,
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ButtonPos::Left,
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"CANCEL",
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theme::button_cancel(),
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);
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let confirm = Button::with_text(
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button_area,
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ButtonPos::Right,
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"CONFIRM",
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theme::button_default(),
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);
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Self {
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scrollbar,
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prev,
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next,
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cancel,
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confirm,
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page,
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}
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}
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fn inner_mut(&mut self) -> &mut T {
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&mut self.page
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}
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fn page_count(&self) -> usize {
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self.scrollbar.page_count
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}
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fn active_page(&self) -> usize {
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self.scrollbar.active_page
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}
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fn fade_after_next_paint(&mut self) {}
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fn content_area(area: Rect) -> Rect {
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Self::areas(area).0
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}
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}
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impl<T: Component> Component for ButtonPage<T> {
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type Msg = PageMsg<T::Msg, bool>;
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fn event(&mut self, ctx: &mut EventCtx, event: Event) -> Option<Self::Msg> {
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if self.scrollbar.has_previous_page() {
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if let Some(ButtonMsg::Clicked) = self.prev.event(ctx, event) {
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// Scroll up.
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self.scrollbar.go_to_previous_page();
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return Some(PageMsg::ChangePage(self.active_page()));
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}
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} else {
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if let Some(ButtonMsg::Clicked) = self.cancel.event(ctx, event) {
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return Some(PageMsg::Controls(false));
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}
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}
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if self.scrollbar.has_next_page() {
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if let Some(ButtonMsg::Clicked) = self.next.event(ctx, event) {
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// Scroll down.
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self.scrollbar.go_to_next_page();
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return Some(PageMsg::ChangePage(self.active_page()));
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}
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} else {
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if let Some(ButtonMsg::Clicked) = self.confirm.event(ctx, event) {
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return Some(PageMsg::Controls(true));
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}
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}
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if let Some(msg) = self.page.event(ctx, event) {
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return Some(PageMsg::Content(msg));
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}
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None
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}
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fn paint(&mut self) {
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self.page.paint();
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self.scrollbar.paint();
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if self.scrollbar.has_previous_page() {
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self.prev.paint();
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} else {
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self.cancel.paint();
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}
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if self.scrollbar.has_next_page() {
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self.next.paint();
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} else {
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self.confirm.paint();
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}
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}
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}
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#[cfg(feature = "ui_debug")]
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impl<T> crate::trace::Trace for ButtonPage<T>
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where
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T: crate::trace::Trace,
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{
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fn trace(&self, t: &mut dyn crate::trace::Tracer) {
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t.open("ButtonPage");
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t.field("active_page", &self.active_page());
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t.field("page_count", &self.page_count());
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t.field("content", &self.page);
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t.close();
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}
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}
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pub struct ScrollBar {
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area: Rect,
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page_count: usize,
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active_page: usize,
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}
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impl ScrollBar {
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pub const WIDTH: i32 = 8;
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pub const DOT_SIZE: Offset = Offset::new(4, 4);
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pub const DOT_INTERVAL: i32 = 6;
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pub fn vertical_right(area: Rect, page_count: usize, active_page: usize) -> Self {
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Self {
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area,
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page_count,
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active_page,
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}
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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.active_page = 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.active_page = self.active_page.saturating_sub(1);
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}
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fn paint_dot(&self, active: bool, top_left: Point) {
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let sides = [
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Rect::from_top_left_and_size(top_left + Offset::new(1, 0), Offset::new(2, 1)),
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Rect::from_top_left_and_size(top_left + Offset::new(0, 1), Offset::new(1, 2)),
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Rect::from_top_left_and_size(
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top_left + Offset::new(1, Self::DOT_SIZE.y - 1),
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Offset::new(2, 1),
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),
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Rect::from_top_left_and_size(
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top_left + Offset::new(Self::DOT_SIZE.x - 1, 1),
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Offset::new(1, 2),
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),
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];
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for side in sides {
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display::rect(side, theme::FG)
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}
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if active {
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display::rect(
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Rect::from_top_left_and_size(top_left, Self::DOT_SIZE).inset(1),
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theme::FG,
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)
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}
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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 count = self.page_count as i32;
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let interval = {
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let available_height = self.area.height();
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let naive_height = count * Self::DOT_INTERVAL;
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if naive_height > available_height {
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available_height / count
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} else {
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Self::DOT_INTERVAL
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}
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};
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let mut dot = Point::new(
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self.area.center().x - Self::DOT_SIZE.x / 2,
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self.area.center().y - (count / 2) * interval,
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);
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for i in 0..self.page_count {
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self.paint_dot(i == self.active_page, dot);
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dot.y += interval
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}
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}
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}
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