PeterForstmeier
14 years ago
5 changed files with 382 additions and 215 deletions
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/* |
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* Created by SharpDevelop. |
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* User: Peter Forstmeier |
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* Date: 16.10.2011 |
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* Time: 19:40 |
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* |
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* To change this template use Tools | Options | Coding | Edit Standard Headers. |
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*/ |
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using System; |
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using System.Diagnostics; |
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using System.Windows.Input; |
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namespace ICSharpCode.SharpDevelop.Widgets |
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{ |
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/// <summary>
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/// Description of RelayCommand.
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/// </summary>
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public class RelayCommand<T> : System.Windows.Input.ICommand |
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{ |
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#region Declarations
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readonly Predicate<T> _canExecute; |
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readonly Action<T> _execute; |
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#endregion
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#region Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="RelayCommand<T>"/> class and the command can always be executed.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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public RelayCommand(Action<T> execute) |
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: this(execute, null) |
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{ |
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} |
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/// <summary>
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/// Initializes a new instance of the <see cref="RelayCommand<T>"/> class.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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/// <param name="canExecute">The execution status logic.</param>
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public RelayCommand(Action<T> execute, Predicate<T> canExecute) |
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{ |
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if (execute == null) |
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throw new ArgumentNullException("execute"); |
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_execute = execute; |
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_canExecute = canExecute; |
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} |
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#endregion
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#region ICommand Members
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public event EventHandler CanExecuteChanged |
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{ |
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add |
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{ |
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if (_canExecute != null) |
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CommandManager.RequerySuggested += value; |
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} |
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remove |
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{ |
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if (_canExecute != null) |
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CommandManager.RequerySuggested -= value; |
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} |
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} |
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[DebuggerStepThrough] |
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public Boolean CanExecute(Object parameter) |
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{ |
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return _canExecute == null ? true : _canExecute((T)parameter); |
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} |
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public void Execute(Object parameter) |
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{ |
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_execute((T)parameter); |
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} |
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#endregion
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} |
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/// <summary>
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/// A command whose sole purpose is to relay its functionality to other objects by invoking delegates. The default return value for the CanExecute method is 'true'.
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/// </summary>
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public class RelayCommand : System.Windows.Input.ICommand |
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{ |
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#region Declarations
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readonly Func<Boolean> _canExecute; |
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readonly Action _execute; |
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#endregion
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#region Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="RelayCommand<T>"/> class and the command can always be executed.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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public RelayCommand(Action execute) |
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: this(execute, null) |
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{ |
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} |
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/// <summary>
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/// Initializes a new instance of the <see cref="RelayCommand<T>"/> class.
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/// </summary>
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/// <param name="execute">The execution logic.</param>
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/// <param name="canExecute">The execution status logic.</param>
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public RelayCommand(Action execute, Func<Boolean> canExecute) |
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{ |
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if (execute == null) |
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throw new ArgumentNullException("execute"); |
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_execute = execute; |
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_canExecute = canExecute; |
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} |
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#endregion
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#region ICommand Members
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public event EventHandler CanExecuteChanged |
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{ |
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add |
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{ |
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if (_canExecute != null) |
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CommandManager.RequerySuggested += value; |
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} |
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remove |
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{ |
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if (_canExecute != null) |
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CommandManager.RequerySuggested -= value; |
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} |
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} |
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[DebuggerStepThrough] |
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public Boolean CanExecute(Object parameter) |
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{ |
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return _canExecute == null ? true : _canExecute(); |
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} |
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public void Execute(Object parameter) |
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{ |
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_execute(); |
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} |
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#endregion
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} |
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} |
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@ -0,0 +1,79 @@
@@ -0,0 +1,79 @@
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/* |
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* Created by SharpDevelop. |
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* User: Peter Forstmeier |
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* Date: 16.10.2011 |
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* Time: 19:35 |
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* |
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* To change this template use Tools | Options | Coding | Edit Standard Headers. |
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*/ |
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using System; |
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using System.ComponentModel; |
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using System.Linq.Expressions; |
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using System.Reflection; |
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namespace ICSharpCode.SharpDevelop.Widgets |
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{ |
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/// <summary>
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/// Description of ViewModelBase.
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/// </summary>
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public class ViewModelBase:INotifyPropertyChanged |
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{ |
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public ViewModelBase() |
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{ |
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} |
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public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged; |
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protected virtual void OnPropertyChanged(System.ComponentModel.PropertyChangedEventArgs e) |
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{ |
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var handler = this.PropertyChanged; |
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if (handler != null) |
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{ |
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handler(this, e); |
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} |
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} |
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protected void RaisePropertyChanged<T>(Expression<Func<T>> propertyExpresssion) |
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{ |
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var propertyName = ExtractPropertyName(propertyExpresssion); |
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this.RaisePropertyChanged(propertyName); |
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} |
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protected void RaisePropertyChanged(String propertyName) |
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{ |
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OnPropertyChanged(new PropertyChangedEventArgs(propertyName)); |
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} |
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private static String ExtractPropertyName<T>(Expression<Func<T>> propertyExpresssion) |
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{ |
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if (propertyExpresssion == null) |
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{ |
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throw new ArgumentNullException("propertyExpresssion"); |
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} |
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var memberExpression = propertyExpresssion.Body as MemberExpression; |
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if (memberExpression == null) |
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{ |
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throw new ArgumentException("The expression is not a member access expression.", "propertyExpresssion"); |
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} |
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var property = memberExpression.Member as PropertyInfo; |
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if (property == null) |
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{ |
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throw new ArgumentException("The member access expression does not access a property.", "propertyExpresssion"); |
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} |
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var getMethod = property.GetGetMethod(true); |
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if (getMethod.IsStatic) |
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{ |
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throw new ArgumentException("The referenced property is a static property.", "propertyExpresssion"); |
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} |
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return memberExpression.Member.Name; |
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} |
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} |
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} |
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