fix: make language selector combobox and dropdown theme-aware (dark/light)

src/ui/combobox.rs

@@ -1,5 +1,5 @@
 use eframe::egui::{self, Rect, Vec2};
-use super::combobox_stil::{draw_gradient_bg, DROPDOWN_TEXT_COLOR};
+use super::combobox_stil::draw_gradient_bg;
 
 /// Stil uygulanmış ComboBox oluşturur (genişlik ayarı yapılmaz, Grid içinde kullanım için).
 pub fn combo_box(
@@ -48,13 +48,14 @@ pub fn selectable_value<T: PartialEq>(
 
     draw_gradient_bg(ui, rect);
 
+    let text_color = combobox_stil_text_color(ui);
     let painter = ui.painter();
     painter.text(
         egui::pos2(rect.left() + 6.0, rect.center().y),
         egui::Align2::LEFT_CENTER,
         label,
         egui::FontId::proportional(14.0),
-        DROPDOWN_TEXT_COLOR,
+        text_color,
     );
 
     if response.clicked() {
@@ -63,6 +64,15 @@ pub fn selectable_value<T: PartialEq>(
     response.on_hover_cursor(egui::CursorIcon::PointingHand)
 }
 
+fn combobox_stil_text_color(ui: &egui::Ui) -> egui::Color32 {
+    let bg = ui.visuals().panel_fill;
+    if bg.r() < 128 && bg.g() < 128 && bg.b() < 128 {
+        egui::Color32::from_rgb(230, 230, 240)
+    } else {
+        egui::Color32::from_rgb(50, 50, 50)
+    }
+}
+
 /// ComboBox dropdown öğesi — özel içerik çizmek için (ör. bayrak + metin).
 /// `add_contents` callback'i verilen `Rect` içine içerik ekler.
 pub fn selectable_value_custom<R>(

src/ui/combobox_stil.rs

@@ -1,64 +1,67 @@
 use eframe::egui::{self, Color32, Rect, Stroke};
 use egui::epaint::Mesh;
 
-// ─── ComboBox Popup Renk Sabitleri ──────────────────────────
-pub const WEAK_BG_INACTIVE: Color32 = Color32::from_rgb(224, 224, 224);
-pub const WEAK_BG_HOVERED:  Color32 = Color32::from_rgb(200, 200, 200);
-pub const WEAK_BG_ACTIVE:   Color32 = Color32::from_rgb(180, 180, 180);
-
-// ─── Gradient Dropdown Öğesi Renkleri ───────────────────────
-pub const GRADIENT_TOP: Color32 = Color32::from_rgb(249, 249, 249);
-pub const GRADIENT_BOT: Color32 = Color32::from_rgb(233, 233, 233);
-
-// ─── ComboBox Metin Renkleri ────────────────────────────────
-/// Seçili metin rengi (ComboBox kapalıyken widget üzerinde görünen metin)
-pub const COMBO_TEXT_COLOR: Color32 = Color32::from_rgb(50, 50, 50);
-/// Açılır listedeki öğelerin metin rengi
-pub const DROPDOWN_TEXT_COLOR: Color32 = Color32::from_rgb(50, 50, 50);
-
-// ─── ComboBox Kenarlık (border) Renkleri ────────────────────
-/// Üzerine gelindiğinde / tıklanınca kenarlık rengi
-pub const COMBO_BORDER_ACCENT: Color32 = Color32::from_rgb(155, 155, 155);
-
 /// Verilen `Visuals` yapısına ComboBox stillerini uygular.
 pub fn apply_visuals(v: &mut egui::Visuals) {
-    v.widgets.inactive.weak_bg_fill = WEAK_BG_INACTIVE;
-    v.widgets.hovered.weak_bg_fill  = WEAK_BG_HOVERED;
-    v.widgets.active.weak_bg_fill   = WEAK_BG_ACTIVE;
+    v.widgets.inactive.weak_bg_fill = Color32::from_rgb(224, 224, 224);
+    v.widgets.hovered.weak_bg_fill  = Color32::from_rgb(200, 200, 200);
+    v.widgets.active.weak_bg_fill   = Color32::from_rgb(180, 180, 180);
 
-    v.widgets.inactive.fg_stroke = Stroke::new(1.0, COMBO_TEXT_COLOR);
+    v.widgets.inactive.fg_stroke = Stroke::new(1.0, Color32::from_rgb(50, 50, 50));
     v.widgets.hovered.fg_stroke  = Stroke::new(1.5, Color32::WHITE);
     v.widgets.active.fg_stroke   = Stroke::new(2.0, Color32::WHITE);
 
-    // Kenarlıklar
-    v.widgets.inactive.bg_stroke = Stroke::new(1.0, COMBO_BORDER_ACCENT);
-    v.widgets.hovered.bg_stroke  = Stroke::new(1.0, COMBO_BORDER_ACCENT);
-    v.widgets.active.bg_stroke   = Stroke::new(1.0, COMBO_BORDER_ACCENT);
+    v.widgets.inactive.bg_stroke = Stroke::new(1.0, Color32::from_rgb(155, 155, 155));
+    v.widgets.hovered.bg_stroke  = Stroke::new(1.0, Color32::from_rgb(155, 155, 155));
+    v.widgets.active.bg_stroke   = Stroke::new(1.0, Color32::from_rgb(155, 155, 155));
 }
 
-/// Açık gri gradyan mesh arkaplanı çizer (dropdown öğeleri için).
+fn is_dark_ui(ui: &egui::Ui) -> bool {
+    let bg = ui.visuals().panel_fill;
+    bg.r() < 128 && bg.g() < 128 && bg.b() < 128
+}
+
+fn gradient_top(ui: &egui::Ui) -> Color32 {
+    if is_dark_ui(ui) {
+        Color32::from_rgb(40, 40, 45)
+    } else {
+        Color32::from_rgb(249, 249, 249)
+    }
+}
+
+fn gradient_bot(ui: &egui::Ui) -> Color32 {
+    if is_dark_ui(ui) {
+        Color32::from_rgb(30, 30, 35)
+    } else {
+        Color32::from_rgb(233, 233, 233)
+    }
+}
+
+/// Açık/koyu temaya uygun gradyan mesh arkaplanı çizer (dropdown öğeleri için).
 pub fn draw_gradient_bg(ui: &mut egui::Ui, rect: Rect) {
+    let top = gradient_top(ui);
+    let bot = gradient_bot(ui);
     let mut mesh = Mesh::default();
     let idx = mesh.vertices.len() as u32;
     mesh.vertices.push(egui::epaint::Vertex {
         pos: egui::pos2(rect.left(), rect.top()),
         uv: egui::pos2(0.0, 0.0),
-        color: GRADIENT_TOP,
+        color: top,
     });
     mesh.vertices.push(egui::epaint::Vertex {
         pos: egui::pos2(rect.right(), rect.top()),
         uv: egui::pos2(0.0, 0.0),
-        color: GRADIENT_TOP,
+        color: top,
     });
     mesh.vertices.push(egui::epaint::Vertex {
         pos: egui::pos2(rect.right(), rect.bottom()),
         uv: egui::pos2(0.0, 0.0),
-        color: GRADIENT_BOT,
+        color: bot,
     });
     mesh.vertices.push(egui::epaint::Vertex {
         pos: egui::pos2(rect.left(), rect.bottom()),
         uv: egui::pos2(0.0, 0.0),
-        color: GRADIENT_BOT,
+        color: bot,
     });
     mesh.indices.extend_from_slice(&[idx, idx + 1, idx + 2, idx + 2, idx + 3, idx]);
     ui.painter().add(egui::Shape::mesh(mesh));