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172 lines
5.0 KiB
172 lines
5.0 KiB
use crate::ui::{
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component::{Component, Event, EventCtx, Never, Paginate},
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geometry::{Alignment, Offset, Rect},
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};
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use super::{
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layout::{LayoutFit, LayoutSink, TextNoOp, TextRenderer},
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op::OpTextLayout,
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};
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#[derive(Clone)]
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pub struct FormattedText {
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op_layout: OpTextLayout<'static>,
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vertical: Alignment,
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char_offset: usize,
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y_offset: i16,
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}
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impl FormattedText {
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pub fn new(op_layout: OpTextLayout<'static>) -> Self {
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Self {
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op_layout,
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vertical: Alignment::Start,
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char_offset: 0,
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y_offset: 0,
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}
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}
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pub fn vertically_centered(mut self) -> Self {
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self.vertical = Alignment::Center;
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self
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}
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fn layout_content(&mut self, sink: &mut dyn LayoutSink) -> LayoutFit {
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self.op_layout
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.layout_ops(self.char_offset, Offset::y(self.y_offset), sink)
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}
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fn align_vertically(&mut self, content_height: i16) {
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let bounds_height = self.op_layout.layout.bounds.height();
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if content_height >= bounds_height {
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self.y_offset = 0;
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return;
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}
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self.y_offset = match self.vertical {
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Alignment::Start => 0,
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Alignment::Center => (bounds_height - content_height) / 2,
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Alignment::End => bounds_height - content_height,
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}
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}
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}
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// Pagination
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impl Paginate for FormattedText {
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fn page_count(&mut self) -> usize {
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let mut page_count = 1; // There's always at least one page.
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// Make sure we're starting page counting from the very beginning
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// (but remembering the offsets not to change them).
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let initial_y_offset = self.y_offset;
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let initial_char_offset = self.char_offset;
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self.char_offset = 0;
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self.y_offset = 0;
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// Looping through the content and counting pages
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// until we finally fit.
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loop {
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let fit = self.layout_content(&mut TextNoOp);
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match fit {
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LayoutFit::Fitting { .. } => {
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break;
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}
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LayoutFit::OutOfBounds {
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processed_chars, ..
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} => {
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page_count += 1;
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self.char_offset += processed_chars;
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}
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}
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}
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// Setting the offsets back to the initial values.
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self.char_offset = initial_char_offset;
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self.y_offset = initial_y_offset;
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page_count
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}
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fn change_page(&mut self, to_page: usize) {
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let mut active_page = 0;
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// Make sure we're starting from the beginning.
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self.char_offset = 0;
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self.y_offset = 0;
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// Looping through the content until we arrive at
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// the wanted page.
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let mut fit = self.layout_content(&mut TextNoOp);
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while active_page < to_page {
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match fit {
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LayoutFit::Fitting { .. } => {
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break;
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}
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LayoutFit::OutOfBounds {
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processed_chars, ..
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} => {
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active_page += 1;
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self.char_offset += processed_chars;
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fit = self.layout_content(&mut TextNoOp);
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}
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}
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}
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// Setting appropriate self.y_offset
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self.align_vertically(fit.height());
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}
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}
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impl Component for FormattedText {
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type Msg = Never;
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fn place(&mut self, bounds: Rect) -> Rect {
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self.op_layout.place(bounds);
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let height = self.layout_content(&mut TextNoOp).height();
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self.align_vertically(height);
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bounds
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}
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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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self.layout_content(&mut TextRenderer);
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}
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#[cfg(feature = "ui_bounds")]
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fn bounds(&self, sink: &mut dyn FnMut(Rect)) {
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sink(self.op_layout.layout.bounds)
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}
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}
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// DEBUG-ONLY SECTION BELOW
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#[cfg(feature = "ui_debug")]
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impl FormattedText {
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/// Is the same as layout_content, but does not use `&mut self`
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/// to be compatible with `trace`.
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/// Therefore it has to do the `clone` of `op_layout`.
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pub fn layout_content_debug(&self, sink: &mut dyn LayoutSink) -> LayoutFit {
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// TODO: how to solve it "properly", without the `clone`?
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// (changing `trace` to `&mut self` had some other isses...)
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self.op_layout
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.clone()
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.layout_content(self.char_offset, sink)
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}
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}
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#[cfg(feature = "ui_debug")]
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impl crate::trace::Trace for FormattedText {
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fn trace(&self, t: &mut dyn crate::trace::Tracer) {
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use crate::ui::component::text::layout::trace::TraceSink;
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use core::cell::Cell;
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let fit: Cell<Option<LayoutFit>> = Cell::new(None);
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t.component("FormattedText");
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t.in_list("text", &|l| {
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let result = self.layout_content_debug(&mut TraceSink(l));
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fit.set(Some(result));
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});
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t.bool("fits", matches!(fit.get(), Some(LayoutFit::Fitting { .. })));
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}
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}
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