128 lines
3.6 KiB
VB.net
128 lines
3.6 KiB
VB.net
#Region "Microsoft.VisualBasic::4b561929ac8aa841e80923efc6860ee8, Microsoft.VisualBasic.Core\ComponentModel\RelayCommand.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program 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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'
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' This program 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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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Class ICallbackInvoke
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'
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' Properties: CallbackInvoke
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'
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' Constructor: (+1 Overloads) Sub New
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' Function: ToString
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'
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' Class RelayCommand
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'
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' Constructor: (+2 Overloads) Sub New
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'
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' Function: CanExecute
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'
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' Sub: Execute
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.Runtime.CompilerServices
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Imports System.Windows.Input
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Imports Microsoft.VisualBasic.Parallel.Tasks
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Namespace ComponentModel
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Public MustInherit Class ICallbackInvoke
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Implements ICallbackTask
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Protected ReadOnly _execute As Action
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Public ReadOnly Property CallbackInvoke As Action Implements ICallbackTask.CallbackInvoke
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Get
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Return _execute
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End Get
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End Property
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Const execute As String = NameOf(execute)
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Protected Sub New(callback As Action)
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If callback Is Nothing Then
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Throw New ArgumentNullException(execute)
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Else
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_execute = callback
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End If
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End Sub
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Public Overrides Function ToString() As String
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Return _execute.ToString
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End Function
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End Class
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''' <summary>
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''' Taken from http://msdn.microsoft.com/en-us/magazine/dd419663.aspx
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''' </summary>
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Public Class RelayCommand : Inherits ICallbackInvoke
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Implements ICommand
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#Region "Members"
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ReadOnly _canExecute As Func(Of [Boolean])
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#End Region
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#Region "Constructors"
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Public Sub New(execute As Action)
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Me.New(execute, Nothing)
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End Sub
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Public Sub New(execute As Action, canExecute As Func(Of [Boolean]))
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Call MyBase.New(execute)
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_canExecute = canExecute
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End Sub
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#End Region
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#Region "ICommand Members"
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<DebuggerStepThrough>
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Public Function CanExecute(parameter As [Object]) As [Boolean] Implements ICommand.CanExecute
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Return If(_canExecute Is Nothing, True, _canExecute())
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End Function
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Public Sub Execute(parameter As [Object]) Implements ICommand.Execute
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_execute()
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End Sub
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#End Region
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Public Event CanExecuteChanged(sender As Object, e As EventArgs) Implements ICommand.CanExecuteChanged
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End Class
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End Namespace
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