This repository has been archived by the owner on May 1, 2024. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 1.9k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Browse files
Browse the repository at this point in the history
#10625 * Cache template sizes for use as estimated item sizes; fixes #10842 * Restore test items * Add clarifying comments * Cache cell measurements * Correct caching index for Carousel * Fix caching exception during item removal; Fix empty view switching overlap; * Update size when reusing Forms element on dequeued cell
- Loading branch information
Showing
23 changed files
with
783 additions
and
38 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
93 changes: 93 additions & 0 deletions
93
...ionViewGalleries/DataTemplateSelectorGalleries/VariedSizeDataTemplateSelectorGallery.xaml
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| <?xml version="1.0" encoding="utf-8" ?> | ||
| <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:datatemplateselectorgalleries="clr-namespace:Xamarin.Forms.Controls.GalleryPages.CollectionViewGalleries.DataTemplateSelectorGalleries" | ||
| x:Class="Xamarin.Forms.Controls.GalleryPages.CollectionViewGalleries.DataTemplateSelectorGalleries.VariedSizeDataTemplateSelectorGallery"> | ||
|
|
||
| <ContentPage.Resources> | ||
| <ResourceDictionary> | ||
| <DataTemplate x:Key="MilkTemplate"> | ||
| <Frame BorderColor="Red" BackgroundColor="Wheat" HeightRequest="100"> | ||
| <StackLayout HeightRequest="100"> | ||
| <Label Text="{Binding Name}" /> | ||
| </StackLayout> | ||
| </Frame> | ||
| </DataTemplate> | ||
|
|
||
| <DataTemplate x:Key="CoffeeTemplate"> | ||
| <Frame BorderColor="Red" BackgroundColor="SaddleBrown" HeightRequest="50"> | ||
| <StackLayout HeightRequest="50"> | ||
| <Label Text="{Binding Name}" /> | ||
| </StackLayout> | ||
| </Frame> | ||
| </DataTemplate> | ||
|
|
||
| <DataTemplate x:Key="LatteTemplate" x:DataType="datatemplateselectorgalleries:Latte"> | ||
| <Frame BorderColor="Red" BackgroundColor="BurlyWood" > | ||
| <StackLayout> | ||
| <Label Text="{Binding Name, StringFormat='Drink name is: {0}'}"/> | ||
| <Label Text=" The ingredients are: " Margin="0,10,0,0"/> | ||
| <StackLayout BindableLayout.ItemsSource="{Binding Ingredients}" > | ||
| <BindableLayout.ItemTemplate> | ||
| <DataTemplate x:DataType="datatemplateselectorgalleries:DrinkBase"> | ||
| <Label Text="{Binding Name, StringFormat=' {0}'}" /> | ||
| </DataTemplate> | ||
| </BindableLayout.ItemTemplate> | ||
| </StackLayout> | ||
| </StackLayout> | ||
| </Frame> | ||
| </DataTemplate> | ||
|
|
||
| <datatemplateselectorgalleries:DrinkTemplateSelector x:Key="VehicleTemplateSelector" | ||
| MilkTemplate="{StaticResource MilkTemplate}" | ||
| CoffeeTemplate="{StaticResource CoffeeTemplate}" | ||
| LatteTemplate="{StaticResource LatteTemplate}"/> | ||
| </ResourceDictionary> | ||
| </ContentPage.Resources> | ||
|
|
||
| <ContentPage.Content> | ||
| <Grid> | ||
| <Grid.RowDefinitions> | ||
| <RowDefinition Height="*"/> | ||
| <RowDefinition Height="Auto"/> | ||
| </Grid.RowDefinitions> | ||
|
|
||
| <CollectionView ItemsSource="{Binding Items}" | ||
| ItemTemplate="{StaticResource VehicleTemplateSelector}" | ||
| VerticalOptions="FillAndExpand" | ||
| ItemSizingStrategy="MeasureAllItems" /> | ||
|
|
||
| <StackLayout Grid.Row="1"> | ||
|
|
||
| <Grid> | ||
| <Grid.ColumnDefinitions> | ||
| <ColumnDefinition/> | ||
| <ColumnDefinition/> | ||
| <ColumnDefinition/> | ||
| </Grid.ColumnDefinitions> | ||
| <Button Grid.Column="0" Text="Insert" Clicked="Insert_OnClicked"/> | ||
| <Button Grid.Column="1" Text="Add" Clicked="Add_OnClicked"/> | ||
| <Button Grid.Column="2" Text="Remove" Clicked="Remove_OnClicked"/> | ||
| </Grid> | ||
|
|
||
| <StackLayout Orientation="Horizontal"> | ||
| <Label Text="Index"/> | ||
| <Entry Text="{Binding Index}" HorizontalOptions="FillAndExpand"/> | ||
| </StackLayout> | ||
|
|
||
| <Picker x:Name="TemplatePicker" | ||
| Title="Select a template" | ||
| TitleColor="Red" | ||
| SelectedItem="{Binding SelectedTemplate}"> | ||
| <Picker.ItemsSource> | ||
| <x:Array Type="{x:Type x:String}"> | ||
| <x:String>Coffee</x:String> | ||
| <x:String>Milk</x:String> | ||
| <x:String>Latte</x:String> | ||
| </x:Array> | ||
| </Picker.ItemsSource> | ||
| </Picker> | ||
|
|
||
| </StackLayout> | ||
| </Grid> | ||
| </ContentPage.Content> | ||
| </ContentPage> |
183 changes: 183 additions & 0 deletions
183
...ViewGalleries/DataTemplateSelectorGalleries/VariedSizeDataTemplateSelectorGallery.xaml.cs
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Collections.ObjectModel; | ||
| using System.Runtime.CompilerServices; | ||
| using Xamarin.Forms.Xaml; | ||
|
|
||
| namespace Xamarin.Forms.Controls.GalleryPages.CollectionViewGalleries.DataTemplateSelectorGalleries | ||
| { | ||
| [XamlCompilation(XamlCompilationOptions.Compile)] | ||
| public partial class VariedSizeDataTemplateSelectorGallery : ContentPage | ||
| { | ||
| string _index = "1"; | ||
| string _itemsCount = "1"; | ||
| int _counter = 6; | ||
| string _selectedTemplate = nameof(Latte); | ||
| bool _shouldTriggerReset; | ||
|
|
||
| public VariedSizeDataTemplateSelectorGallery() | ||
| { | ||
| InitializeComponent(); | ||
| BindingContext = this; | ||
|
|
||
| foreach (var vehicle in CreateDefaultDrinks()) | ||
| { | ||
| Items.Add(vehicle); | ||
| } | ||
|
|
||
| IEnumerable<DrinkBase> CreateDefaultDrinks() | ||
| { | ||
| yield return new Coffee("0"); | ||
| yield return new Milk("1"); | ||
| yield return new Coffee("2"); | ||
| yield return new Coffee("3"); | ||
| yield return new Milk("4"); | ||
| yield return new Coffee("5"); | ||
| } | ||
| } | ||
|
|
||
| public ObservableCollection<DrinkBase> Items { get; set; } = | ||
| new ObservableCollection<DrinkBase>(); | ||
|
|
||
| public string Index | ||
| { | ||
| get => _index; | ||
| set => SetValue(ref _index, value); | ||
| } | ||
|
|
||
| public string ItemsCount | ||
| { | ||
| get => _itemsCount; | ||
| set => SetValue(ref _itemsCount, value); | ||
| } | ||
|
|
||
| public string SelectedTemplate | ||
| { | ||
| get => _selectedTemplate; | ||
| set => SetValue(ref _selectedTemplate, value); | ||
| } | ||
|
|
||
| public bool ShouldTriggerReset | ||
| { | ||
| get => _shouldTriggerReset; | ||
| set => SetValue(ref _shouldTriggerReset, value); | ||
| } | ||
|
|
||
| void Insert_OnClicked(object sender, EventArgs e) | ||
| { | ||
| if (!IsValid(out var index)) | ||
| return; | ||
|
|
||
| Items.Insert(index, CreateDrink()); | ||
| } | ||
|
|
||
| void Add_OnClicked(object sender, EventArgs e) | ||
| { | ||
| if (!IsValid(out var _)) | ||
| return; | ||
|
|
||
| Items.Add(CreateDrink()); | ||
| } | ||
|
|
||
| void SetValue<T>(ref T backingField, in T value, [CallerMemberName] string callerName = null) | ||
| { | ||
| if (Equals(backingField, value)) | ||
| return; | ||
| OnPropertyChanging(callerName); | ||
| backingField = value; | ||
| OnPropertyChanged(callerName); | ||
| } | ||
|
|
||
| void Remove_OnClicked(object sender, EventArgs e) | ||
| { | ||
| if (!IsValid(out var index)) | ||
| return; | ||
|
|
||
| Items.RemoveAt(index); | ||
| } | ||
|
|
||
| DrinkBase CreateDrink() | ||
| { | ||
| switch (SelectedTemplate) | ||
| { | ||
| case nameof(Milk): | ||
| return new Milk(_counter++.ToString()); | ||
| case nameof(Coffee): | ||
| return new Coffee(_counter++.ToString()); | ||
| case nameof(Latte): | ||
| { | ||
| var latte = new Latte(_counter++.ToString()) | ||
| { | ||
| Ingredients = new ObservableCollection<DrinkBase>() { new Milk(_counter++.ToString()), new Coffee(_counter++.ToString()) } | ||
| }; | ||
| return latte; | ||
| } | ||
| default: | ||
| throw new ArgumentException(); | ||
| } | ||
| } | ||
|
|
||
| bool IsValid(out int index) | ||
| { | ||
| index = -1; | ||
| if (string.IsNullOrWhiteSpace(Index)) | ||
| return false; | ||
| if (!int.TryParse(Index, out index)) | ||
| return false; | ||
| if (index > Items.Count || index < 0) | ||
| return false; | ||
|
|
||
| return true; | ||
| } | ||
| } | ||
|
|
||
| class DrinkTemplateSelector : DataTemplateSelector | ||
| { | ||
| public DataTemplate CoffeeTemplate { get; set; } | ||
| public DataTemplate MilkTemplate { get; set; } | ||
| public DataTemplate LatteTemplate { get; set; } | ||
|
|
||
| protected override DataTemplate OnSelectTemplate(object item, BindableObject container) | ||
| { | ||
| if (item is Coffee) | ||
| return CoffeeTemplate; | ||
|
|
||
| if (item is Milk) | ||
| return MilkTemplate; | ||
|
|
||
| if (item is Latte) | ||
| return LatteTemplate; | ||
|
|
||
| throw new ArgumentOutOfRangeException(); | ||
| } | ||
| } | ||
|
|
||
| public abstract class DrinkBase | ||
| { | ||
| protected DrinkBase(string name) => Name = name; | ||
|
|
||
| public string Name { get; set; } | ||
|
|
||
| public override string ToString() | ||
| { | ||
| return Name; | ||
| } | ||
| } | ||
|
|
||
| class Coffee : DrinkBase | ||
| { | ||
| public Coffee(string name) : base(nameof(Coffee) + name) { } | ||
| } | ||
|
|
||
| class Milk : DrinkBase | ||
| { | ||
| public Milk(string name) : base(nameof(Milk) + name) { } | ||
| } | ||
|
|
||
| class Latte : DrinkBase | ||
| { | ||
| public Latte(string name) : base(nameof(Latte) + name) { } | ||
|
|
||
| public ObservableCollection<DrinkBase> Ingredients { get; set; } = new ObservableCollection<DrinkBase>(); | ||
| } | ||
| } |
68 changes: 68 additions & 0 deletions
68
...in.Forms.Controls/GalleryPages/CollectionViewGalleries/ItemSizeGalleries/ChatExample.xaml
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| <?xml version="1.0" encoding="utf-8" ?> | ||
| <ContentPage xmlns="http://xamarin.com/schemas/2014/forms" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" | ||
| xmlns:chat="clr-namespace:Xamarin.Forms.Controls.GalleryPages.CollectionViewGalleries.ItemSizeGalleries" | ||
| x:Class="Xamarin.Forms.Controls.GalleryPages.CollectionViewGalleries.ItemSizeGalleries.ChatExample"> | ||
|
|
||
| <ContentPage.Resources> | ||
| <ResourceDictionary> | ||
| <DataTemplate x:Key="Local"> | ||
| <Grid> | ||
| <Grid.ColumnDefinitions> | ||
| <ColumnDefinition Width="*"></ColumnDefinition> | ||
| <ColumnDefinition Width="2*"></ColumnDefinition> | ||
| </Grid.ColumnDefinitions> | ||
| <Frame BorderColor="Green" BackgroundColor="LightGreen" CornerRadius="5" Grid.Column="1"> | ||
| <StackLayout Margin="2"> | ||
| <Label Text="{Binding Text}" LineBreakMode="WordWrap" FontSize="10" HorizontalTextAlignment="End" /> | ||
| </StackLayout> | ||
| </Frame> | ||
| </Grid> | ||
| </DataTemplate> | ||
|
|
||
| <DataTemplate x:Key="Remote"> | ||
| <Grid Padding="5,0,5,0"> | ||
| <Grid.ColumnDefinitions> | ||
| <ColumnDefinition Width="2*"></ColumnDefinition> | ||
| <ColumnDefinition Width="*"></ColumnDefinition> | ||
| </Grid.ColumnDefinitions> | ||
| <Frame BorderColor="Blue" BackgroundColor="LightBlue" CornerRadius="5"> | ||
| <StackLayout Margin="2"> | ||
| <Label Text="{Binding Text}" LineBreakMode="WordWrap" FontSize="10" HorizontalTextAlignment="Start" /> | ||
| </StackLayout> | ||
| </Frame> | ||
| </Grid> | ||
| </DataTemplate> | ||
|
|
||
| <chat:ChatTemplateSelector x:Key="ChatTemplateSelector" | ||
| LocalTemplate="{StaticResource Local}" | ||
| RemoteTemplate="{StaticResource Remote}"/> | ||
|
|
||
| </ResourceDictionary> | ||
| </ContentPage.Resources> | ||
|
|
||
| <ContentPage.Content> | ||
| <Grid> | ||
| <Grid.RowDefinitions> | ||
| <RowDefinition Height="Auto"/> | ||
| <RowDefinition Height="*"/> | ||
| </Grid.RowDefinitions> | ||
|
|
||
| <StackLayout Orientation="Horizontal"> | ||
| <Button x:Name="AppendRandomSizedItem" Text="Append Random Message" Margin="2" /> | ||
| <Button x:Name="Clear" Text="Clear" Margin="2" /> | ||
| <Button x:Name="Lots" Text="Add 1000 Messages" Margin="2" /> | ||
| </StackLayout> | ||
|
|
||
| <CollectionView ItemsSource="{Binding ChatMessages}" | ||
| ItemTemplate="{StaticResource ChatTemplateSelector}" | ||
| ItemSizingStrategy="MeasureAllItems" | ||
| Grid.Row="1"> | ||
| <CollectionView.ItemsLayout> | ||
| <LinearItemsLayout Orientation="Vertical" ItemSpacing="5"/> | ||
| </CollectionView.ItemsLayout> | ||
| </CollectionView> | ||
|
|
||
| </Grid> | ||
| </ContentPage.Content> | ||
| </ContentPage> |
Oops, something went wrong.