feat(ui): add label and image support to slider

- Add `set_text()`, `set_track_image()`, `set_thumb_image()` methods.
- Include label rendering and auto-scaling based on slider dimensions.
- Replace static `THUMB_WIDTH` with dynamic thumb sizing.
- Add slider thumb and track texture assets.

src/ui/slider.cpp

@@ -9,6 +9,10 @@ namespace Cubed {
 Slider::Slider(Widget* parent) : Widget(parent) {
     init_thumb();
     init_track();
+
+    m_label = std::make_unique<Label>(this);
+    m_label->set_anchor(Anchor::CENTER);
+    void update_text_scale();
 }
 
 Slider& Slider::set_slider(float* value, const float& min, const float& max) {
@@ -18,9 +22,6 @@ Slider& Slider::set_slider(float* value, const float& min, const float& max) {
     return *this;
 }
 
-Image& Slider::get_track() { return *m_track; }
-Image& Slider::get_thumb() { return *m_thumb; }
-
 void Slider::init_track() {
     m_track = std::make_unique<Image>(this);
 
@@ -34,7 +35,7 @@ void Slider::init_thumb() {
 
     m_thumb->set_height(height());
 
-    m_thumb->set_width(THUMB_WIDTH);
+    m_thumb->set_width(height() / 2.0f);
 
     m_thumb->set_anchor(Anchor::TOP_LEFT);
 
@@ -48,6 +49,8 @@ Slider& Slider::set_scale(float scale) {
     m_scale = scale;
     m_track->set_width(width()).set_height(height());
     m_thumb->set_height(height());
+    m_thumb->set_width(height() / 2.0f);
+    void update_text_scale();
     return *this;
 }
 
@@ -58,6 +61,7 @@ Slider& Slider::set_width(float width) {
         return *this;
     }
     m_width = width;
+    void update_text_scale();
     return *this;
 }
 
@@ -65,6 +69,22 @@ Slider& Slider::set_height(float h) {
     m_height = h;
     ASSERT_MSG(m_thumb, "Thumb is nullptr !");
     m_thumb->set_height(height());
+    m_thumb->set_width(height() / 2.0f);
+    void update_text_scale();
+    return *this;
+}
+Slider& Slider::set_text(const std::string& text) {
+    m_text = text;
+    return *this;
+}
+Slider& Slider::set_track_image(const std::string& path,
+                                TextureManager& texture_manager) {
+    m_track->set_image(path, texture_manager);
+    return *this;
+}
+Slider& Slider::set_thumb_image(const std::string& path,
+                                TextureManager& texture_manager) {
+    m_thumb->set_image(path, texture_manager);
     return *this;
 }
 
@@ -112,7 +132,7 @@ void Slider::update_value(float mouse_x) {
     *m_value = m_min + t * (m_max - m_min);
 }
 
-void Slider::on_update(float) {
+void Slider::on_update(float dt) {
     if (!m_value || !m_thumb || !m_track) {
         Logger::error("Please Set value and thumb and track");
         ASSERT(false);
@@ -132,6 +152,18 @@ void Slider::on_update(float) {
     float offset = t * (width() - m_thumb->width());
 
     m_thumb->set_offset({offset, 0});
+    if (m_label && m_value) {
+        m_label->set_text(std::format("{}: {:.2f}", m_text, *m_value));
+    }
+    if (m_track) {
+        m_track->update(dt);
+    }
+    if (m_thumb) {
+        m_thumb->update(dt);
+    }
+    if (m_label) {
+        m_label->update(dt);
+    }
 }
 
 void Slider::on_render(Renderer& renderer) {
@@ -141,6 +173,27 @@ void Slider::on_render(Renderer& renderer) {
     if (m_thumb) {
         m_thumb->render(renderer);
     }
+    if (m_label) {
+        m_label->render(renderer);
+    }
+}
+
+void Slider::update_text_scale() {
+    float text_w = m_label->real_width();
+    float text_h = m_label->real_height();
+
+    if (text_w <= 0.0f || text_h <= 0.0f)
+        return;
+
+    float available_w = std::max(0.0f, width() - 2.0f * PADDING * m_scale);
+    float available_h = std::max(0.0f, height() - 2.0f * PADDING * m_scale);
+
+    float scale_x = available_w / text_w;
+    float scale_y = available_h / text_h;
+
+    float scale = std::max(0.0f, std::min(scale_x, scale_y));
+    scale = std::clamp(scale, 0.01f, 100.0f);
+    m_label->set_scale(scale);
 }
 
 } // namespace Cubed