5539dbe620
* Rename epaint feature "persistence" to "serialize" * Add separate "serialize" feature to egui * egui_demo_lib: separate serialize and persistence features * Add App::persist_native_window and App::persist_egui_memory Controls what gets persisted
120 lines
3.9 KiB
Rust
120 lines
3.9 KiB
Rust
//! Different types of text cursors, i.e. ways to point into a [`super::Galley`].
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/// Character cursor
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#[derive(Clone, Copy, Debug, Default)]
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#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
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pub struct CCursor {
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/// Character offset (NOT byte offset!).
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pub index: usize,
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/// If this cursors sits right at the border of a wrapped row break (NOT paragraph break)
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/// do we prefer the next row?
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/// This is *almost* always what you want, *except* for when
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/// explicitly clicking the end of a row or pressing the end key.
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pub prefer_next_row: bool,
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}
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impl CCursor {
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pub fn new(index: usize) -> Self {
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Self {
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index,
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prefer_next_row: false,
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}
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}
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}
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/// Two `CCursor`s are considered equal if they refer to the same character boundary,
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/// even if one prefers the start of the next row.
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impl PartialEq for CCursor {
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fn eq(&self, other: &CCursor) -> bool {
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self.index == other.index
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}
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}
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impl std::ops::Add<usize> for CCursor {
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type Output = CCursor;
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fn add(self, rhs: usize) -> Self::Output {
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CCursor {
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index: self.index.saturating_add(rhs),
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prefer_next_row: self.prefer_next_row,
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}
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}
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}
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impl std::ops::Sub<usize> for CCursor {
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type Output = CCursor;
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fn sub(self, rhs: usize) -> Self::Output {
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CCursor {
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index: self.index.saturating_sub(rhs),
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prefer_next_row: self.prefer_next_row,
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}
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}
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}
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impl std::ops::AddAssign<usize> for CCursor {
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fn add_assign(&mut self, rhs: usize) {
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self.index = self.index.saturating_add(rhs);
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}
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}
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impl std::ops::SubAssign<usize> for CCursor {
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fn sub_assign(&mut self, rhs: usize) {
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self.index = self.index.saturating_sub(rhs);
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}
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}
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/// Row Cursor
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#[derive(Clone, Copy, Debug, Default, PartialEq)]
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#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
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pub struct RCursor {
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/// 0 is first row, and so on.
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/// Note that a single paragraph can span multiple rows.
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/// (a paragraph is text separated by `\n`).
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pub row: usize,
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/// Character based (NOT bytes).
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/// It is fine if this points to something beyond the end of the current row.
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/// When moving up/down it may again be within the next row.
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pub column: usize,
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}
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/// Paragraph Cursor
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#[derive(Clone, Copy, Debug, Default)]
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#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
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pub struct PCursor {
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/// 0 is first paragraph, and so on.
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/// Note that a single paragraph can span multiple rows.
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/// (a paragraph is text separated by `\n`).
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pub paragraph: usize,
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/// Character based (NOT bytes).
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/// It is fine if this points to something beyond the end of the current paragraph.
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/// When moving up/down it may again be within the next paragraph.
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pub offset: usize,
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/// If this cursors sits right at the border of a wrapped row break (NOT paragraph break)
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/// do we prefer the next row?
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/// This is *almost* always what you want, *except* for when
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/// explicitly clicking the end of a row or pressing the end key.
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pub prefer_next_row: bool,
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}
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/// Two `PCursor`s are considered equal if they refer to the same character boundary,
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/// even if one prefers the start of the next row.
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impl PartialEq for PCursor {
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fn eq(&self, other: &PCursor) -> bool {
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self.paragraph == other.paragraph && self.offset == other.offset
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}
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}
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/// All different types of cursors together.
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/// They all point to the same place, but in their own different ways.
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/// pcursor/rcursor can also point to after the end of the paragraph/row.
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/// Does not implement `PartialEq` because you must think which cursor should be equivalent.
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#[derive(Clone, Copy, Debug, Default)]
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#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
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pub struct Cursor {
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pub ccursor: CCursor,
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pub rcursor: RCursor,
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pub pcursor: PCursor,
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}
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