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Thread: Intellisense Demo

  1. #1

    Thread Starter
    Fanatic Member BenJones's Avatar
    Join Date
    Mar 2010
    Wales UK

    Intellisense Demo

    Hi this is my quick example of adding Intellisense to rich edit box the code is very basic I commented all lines.
    This was just an idea I made after looking at the GetPositionFromCharIndex function in the rich edit box.

    anyway hope you find it useful press . in the editor to see list box pop up.
    This project was done in VB Express 2010
    Attached Files Attached Files

  2. #2
    VB For Fun Edgemeal's Avatar
    Join Date
    Sep 2006

    Re: Intellisense Demo

    Neat idea! One small problem, if you are near the bottom of the edit window the list can't be fully seen.
    What if we put the listbox in a context menu and show that instead?
    This is what I tried so far, Note: Add a ContextMenuStrip, named "ContextMenuStrip1".

    Public Class frmmain
        Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
            'Add some examples to listbox.
            With LstFunc.Items
            End With
            ' setup listbox 
            LstFunc.IntegralHeight = False
            LstFunc.Font = New Font("Courier New", 10, FontStyle.Regular)
            LstFunc.ScrollAlwaysVisible = True
            ' Determine size of widest string in listbox
            Dim wideString, hzSize As Integer
            Using g As System.Drawing.Graphics = LstFunc.CreateGraphics()
                For i As Integer = 0 To LstFunc.Items.Count - 1
                    hzSize = g.MeasureString(LstFunc.Items(i).ToString(), LstFunc.Font).Width
                    If hzSize > wideString Then
                        wideString = hzSize
                    End If
            End Using
            ' get vert scrollbar width
            Dim scrollBarWidth As Integer = SystemInformation.VerticalScrollBarWidth
            ' set listbox size & max size
            LstFunc.Size = New Size(wideString + scrollBarWidth, 112)
            LstFunc.MaximumSize = LstFunc.Size
            ' setup ContextMenuStrip, add listbox.
            ContextMenuStrip1.AutoSize = False
            ContextMenuStrip1.ShowImageMargin = False
            ContextMenuStrip1.BackColor = LstFunc.BackColor
            ContextMenuStrip1.TabStop = True
            ContextMenuStrip1.Size = New Size(LstFunc.Width + 4, LstFunc.Height + 4)
            ContextMenuStrip1.Items.Add(New ToolStripControlHost(LstFunc))
            LstFunc.Location = New Point(2, 2)
        End Sub
        Private Sub InsertText()
            'Inset text from listbox
            txtEditor.SelectedText = LstFunc.Text
            'close MenuStrip
            'Set focus on editor.
        End Sub
        Private Sub txtEditor_PreviewKeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PreviewKeyDownEventArgs) Handles txtEditor.PreviewKeyDown
            If (e.KeyCode = Keys.OemPeriod) Then
                'Get char position were we need to show listbox.
                Dim Po = txtEditor.GetPositionFromCharIndex(txtEditor.SelectionStart)
                'Mod below if needed.
                Po.Y += (txtEditor.Font.GetHeight() * 2) + 8
                Po.X += 30
                'Select first item.
                LstFunc.SelectedIndex = 0
                'Show/Position ContextMenu
                'Set focus on listbox.
            End If
        End Sub
        Private Sub LstFunc_DoubleClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LstFunc.DoubleClick
            'Insert text from listbox to editor.
        End Sub
        Private Sub LstFunc_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles LstFunc.KeyUp
            'Insert text from listbox to editor on enter or spacebar.
            If (e.KeyCode = Keys.Enter) OrElse (e.KeyCode = Keys.Space) Then
                ' hide on TAB or escape keys
            ElseIf (e.KeyCode = Keys.Escape) OrElse (e.KeyCode = Keys.Tab) Then
                'close MenuStrip
                'Set focus on editor.
            End If
        End Sub
    End Class
    EDIT: One odd thing is if I press TAB when menu is shown the listbox moves to the right?

    EDIT #2: Setting "ContextMenuStrip1.TabStop = True" fixed above problem.
    Last edited by Edgemeal; Jan 29th, 2012 at 05:35 PM. Reason: Minor chnages

  3. #3

    Thread Starter
    Fanatic Member BenJones's Avatar
    Join Date
    Mar 2010
    Wales UK

    Re: Intellisense Demo

    Edgemeal that really cool it works good now. Thanks
    I think for my next update I may try and add the info tip you know when you type a function and it shows a tooltip, maybe also add line numbers. My idea with this idea is to build a small VBScript editor as one of my big projects,
    Last edited by BenJones; Jan 30th, 2012 at 02:15 AM.

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