193 строки
5.9 KiB
C#
193 строки
5.9 KiB
C#
using System;
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using System.ComponentModel;
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using System.Windows.Input;
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using Xamarin.Forms.Internals;
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using Xamarin.Forms.Platform;
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namespace Xamarin.Forms
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{
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[RenderWith(typeof(_SearchBarRenderer))]
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public class SearchBar : View, IFontElement, ITextElement, ISearchBarController, IElementConfiguration<SearchBar>
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{
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public static readonly BindableProperty SearchCommandProperty = BindableProperty.Create("SearchCommand", typeof(ICommand), typeof(SearchBar), null, propertyChanged: OnCommandChanged);
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public static readonly BindableProperty SearchCommandParameterProperty = BindableProperty.Create("SearchCommandParameter", typeof(object), typeof(SearchBar), null);
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public static readonly BindableProperty TextProperty = BindableProperty.Create("Text", typeof(string), typeof(SearchBar), default(string), BindingMode.TwoWay,
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propertyChanged: (bindable, oldValue, newValue) =>
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{
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var searchBar = (SearchBar)bindable;
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EventHandler<TextChangedEventArgs> eh = searchBar.TextChanged;
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if (eh != null)
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eh(searchBar, new TextChangedEventArgs((string)oldValue, (string)newValue));
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});
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public static readonly BindableProperty CancelButtonColorProperty = BindableProperty.Create("CancelButtonColor", typeof(Color), typeof(SearchBar), default(Color));
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public static readonly BindableProperty PlaceholderProperty = BindableProperty.Create("Placeholder", typeof(string), typeof(SearchBar), null);
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public static readonly BindableProperty FontFamilyProperty = FontElement.FontFamilyProperty;
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public static readonly BindableProperty FontSizeProperty = FontElement.FontSizeProperty;
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public static readonly BindableProperty FontAttributesProperty = FontElement.FontAttributesProperty;
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public static readonly BindableProperty HorizontalTextAlignmentProperty = BindableProperty.Create("HorizontalTextAlignment", typeof(TextAlignment), typeof(SearchBar), TextAlignment.Start);
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public static readonly BindableProperty TextColorProperty = TextElement.TextColorProperty;
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public static readonly BindableProperty PlaceholderColorProperty = BindableProperty.Create("PlaceholderColor", typeof(Color), typeof(SearchBar), Color.Default);
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readonly Lazy<PlatformConfigurationRegistry<SearchBar>> _platformConfigurationRegistry;
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public Color CancelButtonColor
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{
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get { return (Color)GetValue(CancelButtonColorProperty); }
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set { SetValue(CancelButtonColorProperty, value); }
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}
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public TextAlignment HorizontalTextAlignment
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{
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get { return (TextAlignment)GetValue(HorizontalTextAlignmentProperty); }
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set { SetValue(HorizontalTextAlignmentProperty, value); }
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}
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public string Placeholder
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{
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get { return (string)GetValue(PlaceholderProperty); }
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set { SetValue(PlaceholderProperty, value); }
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}
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public Color PlaceholderColor
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{
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get { return (Color)GetValue(PlaceholderColorProperty); }
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set { SetValue(PlaceholderColorProperty, value); }
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}
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public ICommand SearchCommand
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{
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get { return (ICommand)GetValue(SearchCommandProperty); }
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set { SetValue(SearchCommandProperty, value); }
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}
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public object SearchCommandParameter
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{
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get { return GetValue(SearchCommandParameterProperty); }
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set { SetValue(SearchCommandParameterProperty, value); }
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}
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public string Text
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{
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get { return (string)GetValue(TextProperty); }
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set { SetValue(TextProperty, value); }
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}
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public Color TextColor
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{
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get { return (Color)GetValue(TextElement.TextColorProperty); }
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set { SetValue(TextElement.TextColorProperty, value); }
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}
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bool IsEnabledCore
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{
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set { SetValueCore(IsEnabledProperty, value); }
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}
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public FontAttributes FontAttributes
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{
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get { return (FontAttributes)GetValue(FontAttributesProperty); }
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set { SetValue(FontAttributesProperty, value); }
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}
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public string FontFamily
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{
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get { return (string)GetValue(FontFamilyProperty); }
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set { SetValue(FontFamilyProperty, value); }
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}
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[TypeConverter(typeof(FontSizeConverter))]
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public double FontSize
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{
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get { return (double)GetValue(FontSizeProperty); }
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set { SetValue(FontSizeProperty, value); }
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}
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void IFontElement.OnFontFamilyChanged(string oldValue, string newValue)
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{
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}
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void IFontElement.OnFontSizeChanged(double oldValue, double newValue)
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{
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}
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double IFontElement.FontSizeDefaultValueCreator() =>
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Device.GetNamedSize(NamedSize.Default, (SearchBar)this);
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void IFontElement.OnFontAttributesChanged(FontAttributes oldValue, FontAttributes newValue)
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{
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}
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void IFontElement.OnFontChanged(Font oldValue, Font newValue)
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{
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}
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public event EventHandler SearchButtonPressed;
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public event EventHandler<TextChangedEventArgs> TextChanged;
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public SearchBar()
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{
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_platformConfigurationRegistry = new Lazy<PlatformConfigurationRegistry<SearchBar>>(() => new PlatformConfigurationRegistry<SearchBar>(this));
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}
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[EditorBrowsable(EditorBrowsableState.Never)]
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public void OnSearchButtonPressed()
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{
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ICommand cmd = SearchCommand;
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if (cmd != null && !cmd.CanExecute(SearchCommandParameter))
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return;
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cmd?.Execute(SearchCommandParameter);
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SearchButtonPressed?.Invoke(this, EventArgs.Empty);
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}
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void CommandCanExecuteChanged(object sender, EventArgs eventArgs)
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{
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ICommand cmd = SearchCommand;
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if (cmd != null)
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IsEnabledCore = cmd.CanExecute(SearchCommandParameter);
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}
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static void OnCommandChanged(BindableObject bindable, object oldValue, object newValue)
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{
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var self = (SearchBar)bindable;
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var newCommand = (ICommand)newValue;
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var oldCommand = (ICommand)oldValue;
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if (oldCommand != null)
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{
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oldCommand.CanExecuteChanged -= self.CommandCanExecuteChanged;
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}
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if (newCommand != null)
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{
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newCommand.CanExecuteChanged += self.CommandCanExecuteChanged;
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self.CommandCanExecuteChanged(self, EventArgs.Empty);
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}
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else
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{
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self.IsEnabledCore = true;
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}
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}
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public IPlatformElementConfiguration<T, SearchBar> On<T>() where T : IConfigPlatform
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{
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return _platformConfigurationRegistry.Value.On<T>();
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}
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void ITextElement.OnTextColorPropertyChanged(Color oldValue, Color newValue)
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{
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}
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}
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} |