refactor(tables): FASE 6 - Unificar scrollbars en table_core

- Añadido VerticalScrollbarParams y drawVerticalScrollbar
- Añadido HorizontalScrollbarParams y drawHorizontalScrollbar
- AdvancedTable y VirtualAdvancedTable ahora usan funciones unificadas
- Elimina duplicación de código de renderizado de scrollbars

src/widgets/advanced_table/advanced_table.zig

@@ -505,27 +505,18 @@ fn drawScrollbar(
     const header_h: u32 = if (config.show_headers) config.header_height else 0;
     const scrollbar_h = bounds.h -| header_h;
 
-    const scrollbar_x = bounds.x + @as(i32, @intCast(bounds.w -| scrollbar_w));
-    const scrollbar_y = bounds.y + @as(i32, @intCast(header_h));
-
-    // Background
-    ctx.pushCommand(Command.rect(scrollbar_x, scrollbar_y, scrollbar_w, scrollbar_h, colors.border));
-
-    // Thumb
-    const thumb_ratio = @as(f32, @floatFromInt(visible_rows)) / @as(f32, @floatFromInt(total_rows));
-    const thumb_h = @max(20, @as(u32, @intFromFloat(@as(f32, @floatFromInt(scrollbar_h)) * thumb_ratio)));
-
-    const scroll_ratio = @as(f32, @floatFromInt(table_state.nav.scroll_row)) /
-        @as(f32, @floatFromInt(@max(1, total_rows - visible_rows)));
-    const thumb_y_offset = @as(u32, @intFromFloat(scroll_ratio * @as(f32, @floatFromInt(scrollbar_h - thumb_h))));
-
-    ctx.pushCommand(Command.rect(
-        scrollbar_x + 2,
-        scrollbar_y + @as(i32, @intCast(thumb_y_offset)),
-        scrollbar_w - 4,
-        thumb_h,
-        colors.header_bg,
-    ));
+    // Usar función unificada de table_core
+    table_core.drawVerticalScrollbar(ctx, .{
+        .track_x = bounds.x + @as(i32, @intCast(bounds.w -| scrollbar_w)),
+        .track_y = bounds.y + @as(i32, @intCast(header_h)),
+        .width = scrollbar_w,
+        .height = scrollbar_h,
+        .visible_count = visible_rows,
+        .total_count = total_rows,
+        .scroll_pos = table_state.nav.scroll_row,
+        .track_color = colors.border,
+        .thumb_color = colors.header_bg,
+    });
 }
 
 fn drawEditingOverlay(

src/widgets/table_core.zig

@@ -1332,6 +1332,125 @@ pub fn makeTableDataSource(comptime T: type, impl: *T) TableDataSource {
     };
 }
 
+// =============================================================================
+// Renderizado de Scrollbars (FASE 6)
+// =============================================================================
+
+/// Parámetros para dibujar scrollbar vertical
+pub const VerticalScrollbarParams = struct {
+    /// Posición X del track
+    track_x: i32,
+    /// Posición Y del track
+    track_y: i32,
+    /// Ancho del scrollbar
+    width: u32 = 12,
+    /// Altura del track
+    height: u32,
+    /// Número de elementos visibles
+    visible_count: usize,
+    /// Número total de elementos
+    total_count: usize,
+    /// Posición actual del scroll (0-based)
+    scroll_pos: usize,
+    /// Color del track (fondo)
+    track_color: Style.Color,
+    /// Color del thumb (control deslizante)
+    thumb_color: Style.Color,
+};
+
+/// Dibuja un scrollbar vertical.
+/// Función genérica usada por AdvancedTable y VirtualAdvancedTable.
+pub fn drawVerticalScrollbar(ctx: *Context, params: VerticalScrollbarParams) void {
+    if (params.total_count == 0 or params.visible_count >= params.total_count) return;
+
+    // Track (fondo)
+    ctx.pushCommand(Command.rect(
+        params.track_x,
+        params.track_y,
+        params.width,
+        params.height,
+        params.track_color,
+    ));
+
+    // Calcular tamaño del thumb
+    const visible_ratio = @as(f32, @floatFromInt(params.visible_count)) /
+        @as(f32, @floatFromInt(params.total_count));
+    const thumb_h = @max(20, @as(u32, @intFromFloat(visible_ratio * @as(f32, @floatFromInt(params.height)))));
+
+    // Calcular posición del thumb
+    const max_scroll = params.total_count - params.visible_count;
+    const scroll_ratio = @as(f32, @floatFromInt(params.scroll_pos)) /
+        @as(f32, @floatFromInt(@max(1, max_scroll)));
+    const thumb_y_offset = @as(u32, @intFromFloat(scroll_ratio * @as(f32, @floatFromInt(params.height - thumb_h))));
+
+    // Thumb (control deslizante)
+    ctx.pushCommand(Command.rect(
+        params.track_x + 2,
+        params.track_y + @as(i32, @intCast(thumb_y_offset)),
+        params.width - 4,
+        thumb_h,
+        params.thumb_color,
+    ));
+}
+
+/// Parámetros para dibujar scrollbar horizontal
+pub const HorizontalScrollbarParams = struct {
+    /// Posición X del track
+    track_x: i32,
+    /// Posición Y del track
+    track_y: i32,
+    /// Ancho del track
+    width: u32,
+    /// Altura del scrollbar
+    height: u32 = 12,
+    /// Ancho visible del contenido
+    visible_width: u32,
+    /// Ancho total del contenido
+    total_width: u32,
+    /// Posición actual del scroll horizontal (pixels)
+    scroll_x: i32,
+    /// Máximo scroll horizontal (pixels)
+    max_scroll_x: i32,
+    /// Color del track (fondo)
+    track_color: Style.Color,
+    /// Color del thumb (control deslizante)
+    thumb_color: Style.Color,
+};
+
+/// Dibuja un scrollbar horizontal.
+/// Función genérica usada por VirtualAdvancedTable.
+pub fn drawHorizontalScrollbar(ctx: *Context, params: HorizontalScrollbarParams) void {
+    if (params.max_scroll_x <= 0) return;
+
+    // Track (fondo)
+    ctx.pushCommand(Command.rect(
+        params.track_x,
+        params.track_y,
+        params.width,
+        params.height,
+        params.track_color,
+    ));
+
+    // Calcular tamaño del thumb
+    const visible_ratio = @as(f32, @floatFromInt(params.visible_width)) /
+        @as(f32, @floatFromInt(params.total_width));
+    const thumb_w = @max(20, @as(u32, @intFromFloat(visible_ratio * @as(f32, @floatFromInt(params.width)))));
+
+    // Calcular posición del thumb
+    const scroll_ratio = @as(f32, @floatFromInt(params.scroll_x)) /
+        @as(f32, @floatFromInt(params.max_scroll_x));
+    const thumb_x_offset = @as(u32, @intFromFloat(scroll_ratio * @as(f32, @floatFromInt(params.width - thumb_w))));
+
+    // Thumb (control deslizante)
+    ctx.pushCommand(Command.rect(
+        params.track_x + @as(i32, @intCast(thumb_x_offset)),
+        params.track_y + 2,
+        thumb_w,
+        params.height - 4,
+        params.thumb_color,
+    ));
+}
+
 // =============================================================================
 // Tests
 // =============================================================================

src/widgets/virtual_advanced_table/virtual_advanced_table.zig

@@ -914,21 +914,18 @@ fn drawScrollbar(
     const scrollbar_w: u32 = 12;
     const content_h = bounds.h -| header_h -| footer_h;
 
-    // Scrollbar track
-    const track_x = bounds.x + @as(i32, @intCast(bounds.w - scrollbar_w));
-    const track_y = bounds.y + @as(i32, @intCast(header_h));
-    ctx.pushCommand(Command.rect(track_x, track_y, scrollbar_w, content_h, colors.row_alternate));
-
-    // Thumb size and position
-    const visible_ratio = @as(f32, @floatFromInt(visible_rows)) / @as(f32, @floatFromInt(total_rows));
-    const thumb_h = @max(20, @as(u32, @intFromFloat(visible_ratio * @as(f32, @floatFromInt(content_h)))));
-
-    const scroll_ratio = @as(f32, @floatFromInt(list_state.nav.scroll_row)) /
-        @as(f32, @floatFromInt(@max(1, total_rows - visible_rows)));
-    const thumb_y = track_y + @as(i32, @intFromFloat(scroll_ratio * @as(f32, @floatFromInt(content_h - thumb_h))));
-
-    // Draw thumb
-    ctx.pushCommand(Command.rect(track_x + 2, thumb_y, scrollbar_w - 4, thumb_h, colors.border));
+    // Usar función unificada de table_core
+    table_core.drawVerticalScrollbar(ctx, .{
+        .track_x = bounds.x + @as(i32, @intCast(bounds.w - scrollbar_w)),
+        .track_y = bounds.y + @as(i32, @intCast(header_h)),
+        .width = scrollbar_w,
+        .height = content_h,
+        .visible_count = visible_rows,
+        .total_count = total_rows,
+        .scroll_pos = list_state.nav.scroll_row,
+        .track_color = colors.row_alternate,
+        .thumb_color = colors.border,
+    });
 }
 
 // =============================================================================
@@ -946,27 +943,22 @@ fn drawScrollbarH(
     colors: *const VirtualAdvancedTableConfig.Colors,
 ) void {
     const scrollbar_v_w: u32 = 12; // Width of vertical scrollbar area
-
-    // Scrollbar track position (at the bottom, above footer)
-    const track_x = bounds.x;
-    const track_y = bounds.y + @as(i32, @intCast(bounds.h - footer_h - scrollbar_h));
     const track_w = bounds.w -| scrollbar_v_w;
+    const total_width = available_width + @as(u32, @intCast(@max(0, max_scroll_x)));
 
-    // Track background
-    ctx.pushCommand(Command.rect(track_x, track_y, track_w, scrollbar_h, colors.row_alternate));
-
-    // Calculate thumb size and position
-    if (max_scroll_x <= 0) return;
-
-    const total_width = available_width + @as(u32, @intCast(max_scroll_x));
-    const visible_ratio = @as(f32, @floatFromInt(available_width)) / @as(f32, @floatFromInt(total_width));
-    const thumb_w = @max(20, @as(u32, @intFromFloat(visible_ratio * @as(f32, @floatFromInt(track_w)))));
-
-    const scroll_ratio = @as(f32, @floatFromInt(scroll_offset_x)) / @as(f32, @floatFromInt(max_scroll_x));
-    const thumb_x = track_x + @as(i32, @intFromFloat(scroll_ratio * @as(f32, @floatFromInt(track_w - thumb_w))));
-
-    // Draw thumb
-    ctx.pushCommand(Command.rect(thumb_x, track_y + 2, thumb_w, scrollbar_h - 4, colors.border));
+    // Usar función unificada de table_core
+    table_core.drawHorizontalScrollbar(ctx, .{
+        .track_x = bounds.x,
+        .track_y = bounds.y + @as(i32, @intCast(bounds.h - footer_h - scrollbar_h)),
+        .width = track_w,
+        .height = scrollbar_h,
+        .visible_width = available_width,
+        .total_width = total_width,
+        .scroll_x = scroll_offset_x,
+        .max_scroll_x = max_scroll_x,
+        .track_color = colors.row_alternate,
+        .thumb_color = colors.border,
+    });
 }
 
 // =============================================================================