Add extensible InfoPanel system with custom templates

Introduce a flexible InfoPanel architecture for grid components, allowing per-grid customization via a new InfoPanelType parameter. Add MgInfoPanelTemplateBase for code-based InfoPanel templates with overridable header, content, and footer sections. Support custom templates in MgGridInfoPanel via new RenderFragment parameters. Add MgGridDataColumn for InfoPanel-specific column settings. Demonstrate usage with a custom InfoPanel for ShippingDocument grid. Maintains backward compatibility with default InfoPanel behavior.

FruitBankHybrid.Shared/Components/Grids/ShippingDocuments/GridShippingDocumentBase.cs

@@ -19,6 +19,9 @@ public class GridShippingDocumentBase : FruitBankGridBase<ShippingDocument>, IGr
         AddMessageTag = SignalRTags.AddShippingDocument;
         UpdateMessageTag = SignalRTags.UpdateShippingDocument;
 
+        // Set custom InfoPanel type
+        InfoPanelType = typeof(GridShippingDocumentInfoPanel);
+
         //RemoveMessageTag = SignalRTags.;
     }
 

FruitBankHybrid.Shared/Components/Grids/ShippingDocuments/GridShippingDocumentInfoPanel.cs

@@ -0,0 +1,41 @@
+using AyCode.Blazor.Components.Components.Grids;
+using Microsoft.AspNetCore.Components;
+
+namespace FruitBankHybrid.Shared.Components.Grids.ShippingDocuments;
+
+/// <summary>
+/// Custom InfoPanel for ShippingDocument grid with customized header and footer
+/// </summary>
+public class GridShippingDocumentInfoPanel : MgInfoPanelTemplateBase
+{
+    protected override RenderFragment? GetHeaderTemplate() => builder =>
+    {
+        builder.OpenElement(0, "div");
+        builder.AddAttribute(1, "class", "p-2 border-bottom");
+        builder.OpenElement(2, "h5");
+        builder.AddAttribute(3, "class", "mb-0");
+        builder.AddContent(4, "?? Szállítólevél részletei");
+        builder.CloseElement();
+        builder.CloseElement();
+    };
+
+    protected override RenderFragment? GetFooterTemplate() => builder =>
+    {
+        builder.OpenElement(0, "div");
+        builder.AddAttribute(1, "class", "p-2 border-top d-flex gap-2");
+
+        builder.OpenElement(2, "button");
+        builder.AddAttribute(3, "class", "btn btn-sm btn-outline-primary");
+        builder.AddContent(4, "??? Nyomtatás");
+        builder.CloseElement();
+
+        builder.OpenElement(5, "button");
+        builder.AddAttribute(6, "class", "btn btn-sm btn-outline-secondary");
+        builder.AddContent(7, "?? Export");
+        builder.CloseElement();
+
+        builder.CloseElement();
+    };
+
+    // GetColumnsTemplate() returns null by default ? uses auto-generated columns
+}