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Dynamic: improve state management

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This commit is contained in:
MarcinZiabek
2022-04-27 06:56:13 +02:00
parent 152304b467
commit e1101d870d
4 changed files with 74 additions and 51 deletions
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QuestPDF.Examples/DynamicExamples.cs
+29 -22
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@@ -15,25 +15,29 @@ namespace QuestPDF.Examples
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 OrdersTable : IDynamicComponent
public class OrdersTable : IDynamicComponent<OrdersTableState>
{
private ICollection<OrderItem> Items { get; }
private ICollection<OrderItem> ItemsLeft { get; set; }
public OrdersTableState State { get; set; }
public OrdersTable(ICollection<OrderItem> items)
{
Items = items;
State = new OrdersTableState
{
ShownItemsCount = 0
};
}
public void Compose(DynamicContext context, IDynamicContainer container)
{
if (context.Operation == DynamicLayoutOperation.Reset)
{
ItemsLeft = new List<OrderItem>(Items);
return;
}
var header = ComposeHeader(context);
var sampleFooter = ComposeFooter(context, Enumerable.Empty<OrderItem>());
var decorationHeight = header.Size.Height + sampleFooter.Size.Height;
@@ -41,12 +45,9 @@ namespace QuestPDF.Examples
var rows = GetItemsForPage(context, decorationHeight).ToList();
var footer = ComposeFooter(context, rows.Select(x => x.Item));
if (ItemsLeft.Count > rows.Count)
if (State.ShownItemsCount + rows.Count < Items.Count)
container.HasMoreContent();
if (context.Operation == DynamicLayoutOperation.Draw)
ItemsLeft = ItemsLeft.Skip(rows.Count).ToList();
container.MinimalBox().Decoration(decoration =>
{
decoration.Header().Element(header);
@@ -59,6 +60,11 @@ namespace QuestPDF.Examples
decoration.Footer().Element(footer);
});
State = new OrdersTableState
{
ShownItemsCount = State.ShownItemsCount + rows.Count
};
}
private IDynamicElement ComposeHeader(DynamicContext context)
@@ -98,10 +104,11 @@ namespace QuestPDF.Examples
private IEnumerable<(OrderItem Item, IDynamicElement Element)> GetItemsForPage(DynamicContext context, float decorationHeight)
{
var totalHeight = decorationHeight;
var counter = Items.Count - ItemsLeft.Count + 1;
foreach (var orderItem in ItemsLeft)
foreach (var index in Enumerable.Range(State.ShownItemsCount, Items.Count - State.ShownItemsCount))
{
var item = Items.ElementAt(index);
var element = context.CreateElement(content =>
{
content
@@ -110,11 +117,11 @@ namespace QuestPDF.Examples
.Padding(5)
.Row(row =>
{
row.ConstantItem(30).Text(counter++);
row.RelativeItem().Text(orderItem.ItemName);
row.ConstantItem(50).AlignRight().Text(orderItem.Count);
row.ConstantItem(50).AlignRight().Text($"{orderItem.Price}$");
row.ConstantItem(50).AlignRight().Text($"{orderItem.Count*orderItem.Price}$");
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($"{item.Count*item.Price}$");
});
});
@@ -124,7 +131,7 @@ namespace QuestPDF.Examples
break;
totalHeight += elementHeight;
yield return (orderItem, element);
yield return (item, element);
}
}
}