65 lines
2.2 KiB
C#
65 lines
2.2 KiB
C#
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/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.ComponentModel;
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namespace dnSpy.Contracts.MVVM {
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/// <summary>
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/// Base class of view models
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/// </summary>
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public abstract class ViewModelBase : INotifyPropertyChanged, IDataErrorInfo {
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/// <inheritdoc/>
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public event PropertyChangedEventHandler? PropertyChanged;
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/// <summary>
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/// Raises <see cref="PropertyChanged"/>
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/// </summary>
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/// <param name="propName">Name of property that got changed</param>
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protected void OnPropertyChanged(string propName) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
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/// <summary>
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/// Raises <see cref="PropertyChanged"/>
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/// </summary>
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/// <param name="e">Changed event args</param>
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protected void OnPropertyChanged(PropertyChangedEventArgs e) => PropertyChanged?.Invoke(this, e);
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string IDataErrorInfo.Error { get { throw new NotImplementedException(); } }
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string? IDataErrorInfo.this[string columnName] => Verify(columnName);
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/// <summary>
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/// true if there's an error
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/// </summary>
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public virtual bool HasError => false;
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/// <summary>
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/// Called to check if a property is valid. Returns null or an empty string if there's no error,
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/// else an error string that can be shown to the user
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/// </summary>
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/// <param name="columnName">Name of property</param>
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/// <returns></returns>
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protected virtual string? Verify(string columnName) => string.Empty;
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/// <summary>
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/// Call this method if some property's error state changed
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/// </summary>
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protected void HasErrorUpdated() => OnPropertyChanged(nameof(HasError));
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}
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}
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