65 lines
1.7 KiB
Rust
65 lines
1.7 KiB
Rust
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use std::slice::Iter;
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use cairo;
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use super::context::CellMetrics;
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use ui_model;
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pub struct ModelClipIterator<'a> {
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model_idx: usize,
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model_iter: Iter<'a, ui_model::Line>,
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}
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pub trait ModelClipIteratorFactory {
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fn get_clip_iterator(
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&self,
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ctx: &cairo::Context,
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cell_metrics: &CellMetrics,
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) -> ModelClipIterator;
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}
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impl<'a> Iterator for ModelClipIterator<'a> {
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type Item = (usize, &'a ui_model::Line);
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fn next(&mut self) -> Option<(usize, &'a ui_model::Line)> {
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let next = if let Some(line) = self.model_iter.next() {
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Some((self.model_idx, line))
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} else {
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None
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};
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self.model_idx += 1;
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next
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}
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}
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/// Clip implemented as top - 1/bot + 1
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/// this is because in some cases(like 'g' character) drawing character does not fit to calculated bounds
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/// and if one line must be repainted - also previous and next line must be repainted to
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impl ModelClipIteratorFactory for ui_model::UiModel {
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fn get_clip_iterator(
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&self,
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ctx: &cairo::Context,
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cell_metrics: &CellMetrics,
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) -> ModelClipIterator {
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let model = self.model();
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let (x1, y1, x2, y2) = ctx.clip_extents();
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let model_clip = ui_model::ModelRect::from_area(cell_metrics, x1, y1, x2, y2);
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let model_clip_top = if model_clip.top <= 0 {
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0
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} else {
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model_clip.top - 1
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};
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let model_clip_bot = if model_clip.bot >= model.len() - 1 {
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model.len() - 1
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} else {
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model_clip.bot + 1
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};
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ModelClipIterator {
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model_idx: model_clip_top,
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model_iter: model[model_clip_top..model_clip_bot + 1].iter(),
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}
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}
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}
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