From 22d1be59f5ad7c2386f98989b583a076baeeeb86 Mon Sep 17 00:00:00 2001
From: Simon Gardling <titaniumtown@gmail.com>
Date: Fri, 22 Apr 2022 14:18:24 -0400
Subject: [PATCH] start working on better mobile support

---
 src/function_entry.rs |  5 ++++-
 src/lib.rs            |  1 +
 src/main.rs           |  1 +
 src/math_app.rs       | 27 +++++++++++++++++++++++++--
 4 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/src/function_entry.rs b/src/function_entry.rs
index 999b644..0502097 100644
--- a/src/function_entry.rs
+++ b/src/function_entry.rs
@@ -101,7 +101,9 @@ impl Default for FunctionEntry {
 impl FunctionEntry {
 	/// Creates edit box for [`FunctionEntry`] to edit function settings and string.
 	/// Returns whether or not this function was marked for removal.
-	pub fn function_entry(&mut self, ui: &mut egui::Ui, can_remove: bool, i: usize) -> bool {
+	pub fn function_entry(
+		&mut self, ui: &mut egui::Ui, can_remove: bool, i: usize, mobile: bool,
+	) -> bool {
 		let output_string = self.autocomplete.string.clone();
 		self.update_string(&output_string);
 
@@ -727,6 +729,7 @@ mod tests {
 			do_extrema: false,
 			do_roots: false,
 			plot_width: pixel_width,
+			is_mobile: false,
 		}
 	}
 
diff --git a/src/lib.rs b/src/lib.rs
index d20ef31..f27ec82 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
 #![feature(const_mut_refs)]
 #![feature(let_chains)]
+#![feature(stmt_expr_attributes)]
 
 #[macro_use]
 extern crate static_assertions;
diff --git a/src/main.rs b/src/main.rs
index 3909338..659a70b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,6 @@
 #![feature(const_mut_refs)]
 #![feature(let_chains)]
+#![feature(stmt_expr_attributes)]
 
 #[macro_use]
 extern crate static_assertions;
diff --git a/src/math_app.rs b/src/math_app.rs
index af43bee..596fa25 100644
--- a/src/math_app.rs
+++ b/src/math_app.rs
@@ -30,6 +30,14 @@ cfg_if::cfg_if! {
 			// Remove the element
 			loading_element.remove();
 		}
+
+		fn is_mobile() -> Option<bool> {
+			const MOBILE_DEVICE: [&str; 6] = ["Android", "iPhone", "iPad", "iPod", "webOS", "BlackBerry"];
+
+			let user_agent = web_sys::window()?.navigator().user_agent().ok()?;
+			Some(MOBILE_DEVICE.iter().any(|&name| user_agent.contains(name)))
+		}
+
 	}
 }
 
@@ -60,6 +68,8 @@ pub struct AppSettings {
 
 	/// Stores current plot pixel width
 	pub plot_width: usize,
+
+	pub is_mobile: bool,
 }
 
 impl Default for AppSettings {
@@ -75,6 +85,7 @@ impl Default for AppSettings {
 			do_extrema: true,
 			do_roots: true,
 			plot_width: 0,
+			is_mobile: false,
 		}
 	}
 }
@@ -124,10 +135,19 @@ impl MathApp {
 	pub fn new(cc: &eframe::CreationContext<'_>) -> Self {
 		let start = instant::Instant::now();
 
+		#[allow(unused_mut)]
+		#[allow(unused_assignments)]
+		let mut mobile = false;
+
 		// Remove loading indicator on wasm
 		#[cfg(target_arch = "wasm32")]
 		stop_loading();
 
+		#[cfg(target_arch = "wasm32")]
+		{
+			mobile = is_mobile().unwrap_or_default();
+		}
+
 		#[cfg(threading)]
 		tracing::info!("Threading: Enabled");
 
@@ -256,7 +276,10 @@ impl MathApp {
 			dark_mode: true,
 			text: text_data.expect("text.json failed to load"),
 			opened: Opened::default(),
-			settings: AppSettings::default(),
+			settings: AppSettings {
+				is_mobile: mobile,
+				..AppSettings::default()
+			},
 		}
 	}
 
@@ -362,7 +385,7 @@ impl MathApp {
 				let mut remove_i: Option<usize> = None;
 				for (i, function) in self.functions.iter_mut().enumerate() {
 					// Entry for a function
-					if function.function_entry(ui, can_remove, i) {
+					if function.function_entry(ui, can_remove, i, self.settings.is_mobile) {
 						remove_i = Some(i);
 					}