Dynamic Component: added more examples

2022-05-09 14:07:50 +02:00
parent 52cfa3ab7e
commit e51082400c
6 changed files with 328 additions and 8 deletions
@@ -0,0 +1,185 @@
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using QuestPDF.Elements;
+using QuestPDF.Examples.Engine;
+using QuestPDF.Fluent;
+using QuestPDF.Helpers;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Examples
+{
+    public class OrderItem
+    {
+        public string ItemName { get; set; } = Placeholders.Label();
+        public int Price { get; set; } = Placeholders.Random.Next(1, 11) * 10;
+        public int Count { get; set; } = Placeholders.Random.Next(1, 11);
+    }
+
+    public struct OrdersTableState
+    {
+        public int ShownItemsCount { get; set; }
+    }
+    
+    public class OptimizedOrdersTable : IDynamicComponent<OrdersTableState>
+    {
+        private ICollection<OrderItem> Items { get; }
+        public OrdersTableState State { get; set; }
+
+        public OptimizedOrdersTable(ICollection<OrderItem> items)
+        {
+            Items = items;
+
+            State = new OrdersTableState
+            {
+                ShownItemsCount = 0
+            };
+        }
+        
+        public DynamicComponentComposeResult Compose(DynamicContext context)
+        {
+            var header = ComposeHeader(context);
+            var sampleFooter = ComposeFooter(context, Enumerable.Empty<OrderItem>());
+            var decorationHeight = header.Size.Height + sampleFooter.Size.Height;
+            
+            var rows = GetItemsForPage(context, decorationHeight).ToList();
+            var footer = ComposeFooter(context, rows.Select(x => x.Item));
+
+            var content = context.CreateElement(container =>
+            {
+                container.MinimalBox().Decoration(decoration =>
+                {
+                    decoration.Header().Element(header);
+
+                    decoration.Content().Box().Stack(stack =>
+                    {
+                        foreach (var row in rows)
+                            stack.Item().Element(row.Element);
+                    });
+
+                    decoration.Footer().Element(footer);
+                });
+            });
+
+            State = new OrdersTableState
+            {
+                ShownItemsCount = State.ShownItemsCount + rows.Count
+            };
+
+            return new DynamicComponentComposeResult
+            {
+                Content = content,
+                HasMoreContent = State.ShownItemsCount < Items.Count
+            };
+        }
+
+        private IDynamicElement ComposeHeader(DynamicContext context)
+        {
+            return context.CreateElement(element =>
+            {
+                element
+                    .Width(context.AvailableSize.Width)
+                    .BorderBottom(1)
+                    .BorderColor(Colors.Grey.Darken2)
+                    .Padding(5)
+                    .Row(row =>
+                    {
+                        var textStyle = TextStyle.Default.SemiBold();
+
+                        row.ConstantItem(30).Text("#", textStyle);
+                        row.RelativeItem().Text("Item name", textStyle);
+                        row.ConstantItem(50).AlignRight().Text("Count", textStyle);
+                        row.ConstantItem(50).AlignRight().Text("Price", textStyle);
+                        row.ConstantItem(50).AlignRight().Text("Total", textStyle);
+                    });
+            });
+        }
+        
+        private IDynamicElement ComposeFooter(DynamicContext context, IEnumerable<OrderItem> items)
+        {
+            var total = items.Sum(x => x.Count * x.Price);
+
+            return context.CreateElement(element =>
+            {
+                element
+                    .Width(context.AvailableSize.Width)
+                    .Padding(5)
+                    .AlignRight()
+                    .Text($"Subtotal: {total}$", TextStyle.Default.Size(14).SemiBold());
+            });
+        }
+        
+        private IEnumerable<(OrderItem Item, IDynamicElement Element)> GetItemsForPage(DynamicContext context, float decorationHeight)
+        {
+            var totalHeight = decorationHeight;
+
+            foreach (var index in Enumerable.Range(State.ShownItemsCount, Items.Count - State.ShownItemsCount))
+            {
+                var item = Items.ElementAt(index);
+                
+                var element = context.CreateElement(content =>
+                {
+                    content
+                        .Width(context.AvailableSize.Width)
+                        .BorderBottom(1)
+                        .BorderColor(Colors.Grey.Lighten2)
+                        .Padding(5)
+                        .Row(row =>
+                        {
+                            row.ConstantItem(30).Text(index + 1);
+                            row.RelativeItem().Text(item.ItemName);
+                            row.ConstantItem(50).AlignRight().Text(item.Count);
+                            row.ConstantItem(50).AlignRight().Text($"{item.Price}$");
+                            row.ConstantItem(50).AlignRight().Text($"{item.Count*item.Price}$");
+                        });
+                });
+
+                var elementHeight = element.Size.Height;
+                    
+                if (totalHeight + elementHeight > context.AvailableSize.Height)
+                    break;
+                    
+                totalHeight += elementHeight;
+                yield return (item, element);
+            }
+        }
+    }
+    
+    public static class DynamicOptimizedExamples
+    {
+        [Test]
+        public static void Dynamic()
+        {
+            RenderingTest
+                .Create()
+                .PageSize(PageSizes.A5)
+                .ShowResults()
+                .Render(container =>
+                {
+                    var items = Enumerable.Range(0, 25).Select(x => new OrderItem()).ToList();
+                    
+                    container
+                        .Background(Colors.White)
+                        .Padding(25)
+                        .Decoration(decoration =>
+                        {
+                            decoration
+                                .Header()
+                                .PaddingBottom(5)
+                                .Text(text =>
+                                {
+                                    text.DefaultTextStyle(TextStyle.Default.SemiBold().FontColor(Colors.Blue.Darken2).FontSize(16));
+                                    text.Span("Page ");
+                                    text.CurrentPageNumber();
+                                    text.Span(" of ");
+                                    text.TotalPages();
+                                });
+                            
+                            decoration
+                                .Content()
+                                .Dynamic(new OptimizedOrdersTable(items));
+                        });
+                });
+        }
+    }
+}