From 2fe0eebb6dd51b12a17af002a12a11e4f478fc48 Mon Sep 17 00:00:00 2001
From: Simon Gardling <titaniumtown@gmail.com>
Date: Tue, 1 Mar 2022 21:53:27 -0500
Subject: [PATCH] add option to remove functions

---
 src/egui_app.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/egui_app.rs b/src/egui_app.rs
index b09f72a..88761a4 100644
--- a/src/egui_app.rs
+++ b/src/egui_app.rs
@@ -246,12 +246,20 @@ impl epi::App for MathApp {
                     egui::Slider::new(&mut self.integral_num, INTEGRAL_NUM_RANGE).text("Interval"),
                 );
 
+                let mut remove_i: Option<usize> = None;
                 for (i, function) in self.functions.iter_mut().enumerate() {
                     let mut integral_toggle: bool = false;
                     let integral_enabled = function.integral;
                     // Entry for a function
                     ui.horizontal(|ui| {
                         ui.label("Function: ");
+                        if ui
+                            .add(Button::new("X"))
+                            .on_hover_text("Delete Function")
+                            .clicked()
+                        {
+                            remove_i = Some(i);
+                        }
                         if ui
                             .add(Button::new("∫"))
                             .on_hover_text(if integral_enabled {
@@ -292,6 +300,13 @@ impl epi::App for MathApp {
                     }
                 }
 
+                if self.functions.len() > 1 {
+                    if let Some(remove_i_unwrap) = remove_i {
+                        self.functions.remove(remove_i_unwrap);
+                        self.func_strs.remove(remove_i_unwrap);
+                    }
+                }
+
                 // Open Source and Licensing information
                 ui.hyperlink_to(
                     "I'm Opensource!",