migrations/egui
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Add read/write of TextEdit cursor state (#848)

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* Rename `CursorPair` to `CursorRange`
* Easymark editor: add keyboard shortcuts to toggle bold, italics etc
* Split up TextEdit into separate files
* Add TextEdit::show that returns a rich TextEditOutput object with response, galley and cursor
* Rename text_edit::State to TextEditState
This commit is contained in:
Emil Ernerfeldt
2021-10-27 16:30:14 +02:00
committed by GitHub
parent ddd52f47c5
commit c7638ca7f5
11 changed files with 810 additions and 533 deletions
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105
egui_demo_lib/src/easy_mark/easy_mark_editor.rs
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@@ -1,4 +1,4 @@
use egui::*;
use egui::{text_edit::CCursorRange, *};
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[cfg_attr(feature = "serde", serde(default))]
@@ -58,6 +58,8 @@ impl EasyMarkEditor {
ui.checkbox(&mut self.show_rendered, "Show rendered");
});
ui.label("Use ctrl/cmd + key to toggle: B: *strong* C: `code` I: /italics/ L: $lowered$ R: ^raised^ S: ~strikethrough~ U: _underline_");
ui.separator();
if self.show_rendered {
@@ -84,7 +86,7 @@ impl EasyMarkEditor {
code, highlighter, ..
} = self;
if self.highlight_editor {
let response = if self.highlight_editor {
let mut layouter = |ui: &egui::Ui, easymark: &str, wrap_width: f32| {
let mut layout_job = highlighter.highlight(ui.visuals(), easymark);
layout_job.wrap_width = wrap_width;
@@ -96,12 +98,103 @@ impl EasyMarkEditor {
.desired_width(f32::INFINITY)
.text_style(egui::TextStyle::Monospace) // for cursor height
.layouter(&mut layouter),
);
)
} else {
ui.add(egui::TextEdit::multiline(code).desired_width(f32::INFINITY));
ui.add(egui::TextEdit::multiline(code).desired_width(f32::INFINITY))
};
if let Some(mut state) = TextEdit::load_state(ui.ctx(), response.id) {
if let Some(mut ccursor_range) = state.ccursor_range() {
let any_change = shortcuts(ui, code, &mut ccursor_range);
if any_change {
state.set_ccursor_range(Some(ccursor_range));
state.store(ui.ctx(), response.id);
}
}
}
// let cursor = TextEdit::cursor(response.id);
// TODO: cmd-i, cmd-b, etc for italics, bold, ....
}
}
fn shortcuts(ui: &Ui, code: &mut dyn TextBuffer, ccursor_range: &mut CCursorRange) -> bool {
let mut any_change = false;
for event in &ui.input().events {
if let Event::Key {
key,
pressed: true,
modifiers,
} = event
{
if modifiers.command_only() {
match &key {
// toggle *bold*
Key::B => {
toggle_surrounding(code, ccursor_range, "*");
any_change = true;
}
// toggle `code`
Key::C => {
toggle_surrounding(code, ccursor_range, "`");
any_change = true;
}
// toggle /italics/
Key::I => {
toggle_surrounding(code, ccursor_range, "/");
any_change = true;
}
// toggle $lowered$
Key::L => {
toggle_surrounding(code, ccursor_range, "$");
any_change = true;
}
// toggle ^raised^
Key::R => {
toggle_surrounding(code, ccursor_range, "^");
any_change = true;
}
// toggle ~strikethrough~
Key::S => {
toggle_surrounding(code, ccursor_range, "~");
any_change = true;
}
// toggle _underline_
Key::U => {
toggle_surrounding(code, ccursor_range, "_");
any_change = true;
}
_ => {}
}
}
}
}
any_change
}
/// E.g. toggle *strong* with `toggle(&mut text, &mut cursor, "*")`
fn toggle_surrounding(
code: &mut dyn TextBuffer,
ccursor_range: &mut CCursorRange,
surrounding: &str,
) {
let [primary, secondary] = ccursor_range.sorted();
let surrounding_ccount = surrounding.chars().count();
let prefix_crange = primary.index.saturating_sub(surrounding_ccount)..primary.index;
let suffix_crange = secondary.index..secondary.index.saturating_add(surrounding_ccount);
let already_surrounded = code.char_range(prefix_crange.clone()) == surrounding
&& code.char_range(suffix_crange.clone()) == surrounding;
if already_surrounded {
code.delete_char_range(suffix_crange);
code.delete_char_range(prefix_crange);
ccursor_range.primary.index -= surrounding_ccount;
ccursor_range.secondary.index -= surrounding_ccount;
} else {
code.insert_text(surrounding, secondary.index);
let advance = code.insert_text(surrounding, primary.index);
ccursor_range.primary.index += advance;
ccursor_range.secondary.index += advance;
}
}