microsoft-visualbasic-runtime/ApplicationServices/Terminal/InteractiveIODevice/TerminalExtensions.vb

#Region "Microsoft.VisualBasic::14341d17843f00756c425a6687e34f05, Microsoft.VisualBasic.Core\ApplicationServices\Terminal\InteractiveIODevice\TerminalExtensions.vb"

    ' Author:
    ' 
    '       asuka (amethyst.asuka@gcmodeller.org)
    '       xie (genetics@smrucc.org)
    '       xieguigang (xie.guigang@live.com)
    ' 
    ' Copyright (c) 2018 GPL3 Licensed
    ' 
    ' 
    ' GNU GENERAL PUBLIC LICENSE (GPL3)
    ' 
    ' 
    ' This program is free software: you can redistribute it and/or modify
    ' it under the terms of the GNU General Public License as published by
    ' the Free Software Foundation, either version 3 of the License, or
    ' (at your option) any later version.
    ' 
    ' This program is distributed in the hope that it will be useful,
    ' but WITHOUT ANY WARRANTY; without even the implied warranty of
    ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    ' GNU General Public License for more details.
    ' 
    ' You should have received a copy of the GNU General Public License
    ' along with this program. If not, see <http://www.gnu.org/licenses/>.



    ' /********************************************************************************/

    ' Summaries:

    '     Module TerminalEvents
    ' 
    ' 
    '         Delegate Sub
    ' 
    '             Properties: ConsoleHandleInvalid, CurrentSize
    ' 
    '             Sub: __detects
    ' 
    ' 
    ' 
    ' /********************************************************************************/

#End Region

Imports System.Drawing
Imports System.Threading
Imports Microsoft.VisualBasic.Language

Namespace Terminal

    Public Module TerminalEvents

        Public Delegate Sub ResizeEventHandle(size As Size, oldSize As Size)

        Dim __resizeHandles As New List(Of ResizeEventHandle)
        Dim _old As Size
        Dim _eventThread As Thread

        Public ReadOnly Property CurrentSize As Size
            Get
                Return _old
            End Get
        End Property

        Private Sub __detects()
            Do While App.Running
                If Console.WindowHeight <> _old.Height Then
                    RaiseEvent Resize()
                ElseIf Console.WindowWidth <> _old.Width Then
                    RaiseEvent Resize()
                End If

                Thread.Sleep(10)
            Loop
        End Sub

        Public ReadOnly Property ConsoleHandleInvalid As Boolean = False

        ''' <summary>
        ''' Terminal resize event for [<see cref="Console.WindowWidth"/>, <see cref="Console.WindowHeight"/>]
        ''' </summary>
        Public Custom Event Resize As ResizeEventHandle
            AddHandler(value As ResizeEventHandle)
                If __resizeHandles.IndexOf(value) = -1 Then
                    __resizeHandles += value
                End If

                If _eventThread Is Nothing Then
                    Try
                        _old = New Size(Console.WindowWidth, Console.WindowHeight)
                        _eventThread = New Thread(AddressOf __detects)
                        _eventThread.Start()
                    Catch ex As Exception  ' 可能是WindowsForm应用，则在这里就忽略掉这个错误了
                        Call App.LogException(ex)
                        _ConsoleHandleInvalid = True
                    End Try
                End If
            End AddHandler
            RemoveHandler(value As ResizeEventHandle)
                If __resizeHandles.IndexOf(value) > -1 Then
                    __resizeHandles.Remove(value)
                End If

                If __resizeHandles.Count = 0 Then
                    _eventThread.Abort()
                    _eventThread = Nothing
                End If
            End RemoveHandler
            RaiseEvent()
                Dim [new] As New Size(Console.WindowWidth, Console.WindowHeight)

                For Each h As ResizeEventHandle In __resizeHandles
                    Call h([new], _old)
                Next

                _old = [new]
            End RaiseEvent
        End Event
    End Module
End Namespace