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feat: add watermark support.

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This commit is contained in:
rabbitism
2024-06-23 16:46:09 +08:00
parent 44d0700119
commit 4aa20d930f
3 changed files with 64 additions and 3 deletions
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54
src/Ursa/Controls/TagInput/TagInput.cs
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@@ -1,6 +1,7 @@
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using Avalonia;
using Avalonia.Collections;
using Avalonia.Controls;
@@ -8,32 +9,56 @@ using Avalonia.Controls.Metadata;
using Avalonia.Controls.Presenters;
using Avalonia.Controls.Primitives;
using Avalonia.Controls.Templates;
using Avalonia.Data;
using Avalonia.Data.Converters;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Layout;
using Avalonia.Styling;
using Irihi.Avalonia.Shared.Common;
using Irihi.Avalonia.Shared.Helpers;
namespace Ursa.Controls;
[TemplatePart(PART_ItemsControl, typeof(ItemsControl))]
[TemplatePart(PART_Watermark, typeof(Visual))]
[PseudoClasses(PseudoClassName.PC_Empty)]
public class TagInput : TemplatedControl
{
public const string PART_ItemsControl = "PART_ItemsControl";
public const string PART_Watermark = "PART_Watermark";
private readonly TextBox _textBox;
private ItemsControl? _itemsControl;
private Visual? _watermark;
public static readonly StyledProperty<IList<string>> TagsProperty =
AvaloniaProperty.Register<TagInput, IList<string>>(
nameof(Tags));
public static readonly StyledProperty<string?> WatermarkProperty = TextBox.WatermarkProperty.AddOwner<TagInput>();
public string? Watermark
{
get => GetValue(WatermarkProperty);
set => SetValue(WatermarkProperty, value);
}
public IList<string> Tags
{
get => GetValue(TagsProperty);
set => SetValue(TagsProperty, value);
}
public static readonly StyledProperty<int> MaxCountProperty = AvaloniaProperty.Register<TagInput, int>(
nameof(MaxCount), int.MaxValue);
public int MaxCount
{
get => GetValue(MaxCountProperty);
set => SetValue(MaxCountProperty, value);
}
public static readonly DirectProperty<TagInput, IList> ItemsProperty =
AvaloniaProperty.RegisterDirect<TagInput, IList>(
nameof(Items), o => o.Items);
@@ -150,6 +175,21 @@ public class TagInput : TemplatedControl
{
base.OnApplyTemplate(e);
_itemsControl = e.NameScope.Find<ItemsControl>(PART_ItemsControl);
_watermark = e.NameScope.Find<Visual>(PART_Watermark);
}
private TextPresenter? _presenter;
protected override void OnLoaded(RoutedEventArgs e)
{
base.OnLoaded(e);
if (_watermark is null) return;
_presenter = _textBox.GetTemplateChildren().OfType<TextPresenter>().FirstOrDefault();
_presenter?.GetObservable(TextPresenter.PreeditTextProperty).Subscribe(a => CheckEmpty());
_textBox.GetObservable(TextBox.TextProperty).Subscribe(a => CheckEmpty());
if (Tags is INotifyCollectionChanged incc)
{
incc.GetWeakCollectionChangedObservable().Subscribe(a => this.CheckEmpty());
}
}
private void OnInputThemePropertyChanged(AvaloniaPropertyChangedEventArgs args)
@@ -160,6 +200,18 @@ public class TagInput : TemplatedControl
_textBox.Theme = newTheme;
}
}
private void CheckEmpty()
{
if(string.IsNullOrWhiteSpace(_presenter?.PreeditText) && string.IsNullOrEmpty(_textBox?.Text) && (Tags.Count==0))
{
PseudoClasses.Set(PseudoClassName.PC_Empty, true);
}
else
{
PseudoClasses.Set(PseudoClassName.PC_Empty, false);
}
}
private void OnTagsPropertyChanged(AvaloniaPropertyChangedEventArgs args)
{