Add App

src/preferences.rs

@@ -0,0 +1,72 @@
+use egui::{Color32, Context, RichText, Theme, Ui, Visuals};
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)]
+#[serde(default)]
+pub struct Preferences {
+    /// Enable animations
+    pub animations: bool,
+
+    /// Enable high-contrast theme
+    pub high_contrast: bool,
+
+    #[serde(skip)]
+    has_applied_theme: bool,
+}
+
+impl Default for Preferences {
+    fn default() -> Self {
+        Self {
+            animations: true,
+            high_contrast: false,
+            has_applied_theme: false,
+        }
+    }
+}
+
+impl Preferences {
+    /// Apply preferences, if they haven't already been applied.
+    pub fn apply(&mut self, ctx: &Context) {
+        if !self.has_applied_theme {
+            self.has_applied_theme = true;
+
+            if self.high_contrast {
+                // widgets.active:         color of headers in textedit
+                // widgets.inactive:       color of button labels
+                // widgets.hovered:        color of hovered button labels
+                // widgets.noninteractive: color of labels and normal textedit text
+                let mut dark_visuals = Visuals::dark();
+                let mut light_visuals = Visuals::light();
+
+                dark_visuals.widgets.noninteractive.fg_stroke.color = Color32::WHITE;
+                dark_visuals.widgets.inactive.fg_stroke.color = Color32::WHITE;
+                dark_visuals.widgets.hovered.fg_stroke.color = Color32::WHITE;
+
+                light_visuals.widgets.noninteractive.fg_stroke.color = Color32::BLACK;
+                light_visuals.widgets.inactive.fg_stroke.color = Color32::BLACK;
+                light_visuals.widgets.hovered.fg_stroke.color = Color32::BLACK;
+
+                ctx.set_visuals_of(Theme::Dark, dark_visuals);
+                ctx.set_visuals_of(Theme::Light, light_visuals);
+            } else {
+                ctx.set_visuals_of(Theme::Dark, Visuals::dark());
+                ctx.set_visuals_of(Theme::Light, Visuals::light());
+            }
+        }
+    }
+
+    /// Show preference switches
+    pub fn show(&mut self, ui: &mut Ui) {
+        ui.label(RichText::new("Prefs").weak());
+
+        ui.toggle_value(&mut self.animations, "Animations");
+
+        let high_contrast_toggle = ui.toggle_value(&mut self.high_contrast, "High Contrast");
+        if high_contrast_toggle.clicked() {
+            self.has_applied_theme = false;
+            self.apply(ui.ctx());
+        }
+
+        egui::widgets::global_theme_preference_buttons(ui);
+    }
+}