From dc577c03c90d9e6e2675ceae2d9857ad60c56eaa Mon Sep 17 00:00:00 2001
From: Simon Gardling <titaniumtown@gmail.com>
Date: Wed, 30 Mar 2022 15:18:30 -0400
Subject: [PATCH] move cursor to end when completion accepted

---
 src/egui_app.rs | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/egui_app.rs b/src/egui_app.rs
index 800902f..f8cf263 100644
--- a/src/egui_app.rs
+++ b/src/egui_app.rs
@@ -4,10 +4,12 @@ use crate::misc::{dyn_mut_iter, option_vec_printer, JsonFileOutput, SerdeValueHe
 use crate::parsing::{process_func_str, test_func};
 use crate::suggestions::generate_hint;
 use eframe::{egui, epi};
+use egui::epaint::text::cursor::{PCursor, RCursor};
 use egui::plot::Plot;
 use egui::{
-	Button, CentralPanel, Color32, ComboBox, Context, FontData, FontDefinitions, FontFamily, Key,
-	RichText, SidePanel, Slider, TextEdit, TopBottomPanel, Vec2, Visuals, Widget, Window,
+	text::CCursor, text_edit::CursorRange, Button, CentralPanel, Color32, ComboBox, Context,
+	FontData, FontDefinitions, FontFamily, Key, RichText, SidePanel, Slider, TextEdit,
+	TopBottomPanel, Vec2, Visuals, Widget, Window,
 };
 use epi::Frame;
 use instant::Duration;
@@ -503,9 +505,12 @@ impl MathApp {
 						// Contains the function string in a text box that the user can edit
 						let hint = generate_hint(&self.func_strs[i]).unwrap_or_default();
 
+						let te_id = ui.make_persistent_id("text_edit_ac".to_string());
+
 						let func_edit_focus = TextEdit::singleline(&mut self.func_strs[i])
 							.hint_text(&hint)
 							.hint_forward(true)
+							.id(te_id)
 							.ui(ui)
 							.has_focus();
 
@@ -515,6 +520,22 @@ impl MathApp {
 							self.text_boxes_focused = true;
 							if ui.input().key_down(Key::ArrowRight) {
 								self.func_strs[i] += &hint;
+								let mut state = TextEdit::load_state(ui.ctx(), te_id).unwrap();
+								state.set_cursor_range(Some(CursorRange::one(
+									egui::epaint::text::cursor::Cursor {
+										ccursor: CCursor {
+											index: 0,
+											prefer_next_row: false,
+										},
+										rcursor: RCursor { row: 0, column: 0 },
+										pcursor: PCursor {
+											paragraph: 0,
+											offset: 10000,
+											prefer_next_row: false,
+										},
+									},
+								)));
+								TextEdit::store_state(ui.ctx(), te_id, state);
 							}
 						}
 					});