From 496fdb52b48e2ec406b5306d72db9c95eef93759 Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emilernerfeldt@gmail.com>
Date: Sat, 31 Oct 2020 09:15:20 +0100
Subject: [PATCH] [demo] add [DEBUG BUILD] warning text

---
 egui/src/demos/app.rs          |  1 +
 egui/src/demos/demo_windows.rs |  1 +
 egui/src/demos/mod.rs          | 23 +++++++++++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/egui/src/demos/app.rs b/egui/src/demos/app.rs
index 4fba09a7..ad810bad 100644
--- a/egui/src/demos/app.rs
+++ b/egui/src/demos/app.rs
@@ -86,6 +86,7 @@ impl FrameHistory {
             "Includes Egui layout and tesselation time.\n\
             Does not include GPU usage, nor overhead for sending data to GPU.",
         );
+        crate::demos::warn_if_debug_build(ui);
 
         crate::CollapsingHeader::new("CPU usage history")
             .default_open(false)
diff --git a/egui/src/demos/demo_windows.rs b/egui/src/demos/demo_windows.rs
index d8ecd33d..e45655cb 100644
--- a/egui/src/demos/demo_windows.rs
+++ b/egui/src/demos/demo_windows.rs
@@ -63,6 +63,7 @@ impl DemoWindows {
 
         crate::SidePanel::left(Id::new("side_panel"), 200.0).show(ctx, |ui| {
             ui.heading("Egui Demo");
+            crate::demos::warn_if_debug_build(ui);
             ui.label("Egui is an immediate mode GUI library written in Rust.");
             ui.add(crate::Hyperlink::new("https://github.com/emilk/egui").text("Egui home page"));
 
diff --git a/egui/src/demos/mod.rs b/egui/src/demos/mod.rs
index 8b025995..02c3ec18 100644
--- a/egui/src/demos/mod.rs
+++ b/egui/src/demos/mod.rs
@@ -20,3 +20,26 @@ pub const LOREM_IPSUM: &str = "Lorem ipsum dolor sit amet, consectetur adipiscin
 pub const LOREM_IPSUM_LONG: &str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
 
 Curabitur pretium tincidunt lacus. Nulla gravida orci a odio. Nullam varius, turpis et commodo pharetra, est eros bibendum elit, nec luctus magna felis sollicitudin mauris. Integer in mauris eu nibh euismod gravida. Duis ac tellus et risus vulputate vehicula. Donec lobortis risus a elit. Etiam tempor. Ut ullamcorper, ligula eu tempor congue, eros est euismod turpis, id tincidunt sapien risus a quam. Maecenas fermentum consequat mi. Donec fermentum. Pellentesque malesuada nulla a mi. Duis sapien sem, aliquet nec, commodo eget, consequat quis, neque. Aliquam faucibus, elit ut dictum aliquet, felis nisl adipiscing sapien, sed malesuada diam lacus eget erat. Cras mollis scelerisque nunc. Nullam arcu. Aliquam consequat. Curabitur augue lorem, dapibus quis, laoreet et, pretium ac, nisi. Aenean magna nisl, mollis quis, molestie eu, feugiat in, orci. In hac habitasse platea dictumst.";
+
+// ----------------------------------------------------------------------------
+
+#[cfg(debug_assertions)]
+pub fn has_debug_assertions() -> bool {
+    true
+}
+
+#[cfg(not(debug_assertions))]
+pub fn has_debug_assertions() -> bool {
+    false
+}
+
+pub fn warn_if_debug_build(ui: &mut crate::Ui) {
+    if has_debug_assertions() {
+        ui.label(
+            crate::Label::new("[Debug build]")
+                .small()
+                .text_color(crate::color::RED),
+        )
+        .on_hover_text("Egui has detect that debug assertions are enabled.");
+    }
+}