Add reset_color_map()

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fltk-theme"
-version = "0.7.2"
+version = "0.7.3"
 authors = ["MoAlyousef <mohammed.alyousef@neurosrg.com>"]
 edition = "2021"
 description = "A theming crate for fltk-rs"

examples/predef_color.rs

@@ -1,5 +1,5 @@
 use fltk::{prelude::*, *};
-use fltk_theme::{color_themes, ColorTheme};
+use fltk_theme::{reset_color_map, color_themes, ColorTheme};
 
 fn main() {
     let a = app::App::default().with_scheme(app::Scheme::Gtk);
@@ -17,7 +17,8 @@ fn main() {
     let mut round = button::RoundButton::new(160, 180, 80, 30, "  Round");
     round.set_value(true);
     round.set_frame(enums::FrameType::FlatBox);
-    button::Button::new(160, 220, 80, 30, "Hello");
+    let mut button = button::Button::new(160, 220, 80, 30, "Hello");
+    button.set_callback(|_| reset_color_map());
     win.end();
     win.show();
     choice.set_callback(|c| {

src/lib.rs

@@ -1,7 +1,7 @@
 #![doc = include_str!("../README.md")]
 #![allow(clippy::needless_doctest_main)]
 
-use fltk::{app, enums::Color};
+use fltk::{app, enums::Color, utils::oncelock::OnceCell};
 pub mod color_themes;
 pub mod colors;
 pub mod widget_schemes;
@@ -16,6 +16,18 @@ pub struct ColorMap {
     pub b: u8,
 }
 
+static DEFAULT_COLOR_MAP: OnceCell<Vec<ColorMap>> = OnceCell::new();
+
+/// Resets the current map to the default color map
+pub fn reset_color_map() {
+    if let Some(old_map) = DEFAULT_COLOR_MAP.get() {
+        for elem in old_map {
+            app::set_color(Color::by_index(elem.index), elem.r, elem.g, elem.b);
+        }
+        app::redraw();
+    }
+}
+
 #[macro_export]
 macro_rules! cmap {
     ($i:tt, $r:tt, $g:tt, $b:tt) => {
@@ -45,6 +57,14 @@ impl ColorTheme {
 
     /// apply() the theme
     pub fn apply(&self) {
+        if DEFAULT_COLOR_MAP.get().is_none() {
+            let mut default_map = Vec::with_capacity(256);
+            for index in 0..=255 {
+                let (r, g, b) = Color::by_index(index).to_rgb();
+                default_map.push(ColorMap {index, r, g, b });
+            }
+            DEFAULT_COLOR_MAP.set(default_map).unwrap();
+        }
         for elem in &self.0 {
             app::set_color(Color::by_index(elem.index), elem.r, elem.g, elem.b);
         }