[RESOLVED] Listbox Multiselect, Double Click, And Drag&Drop

Hello!
I have an application that has two list box controls, and I've tried to enable the drag and drop feature between the two lists, but I have some problems, I want to combine the drag and drop with some other features:
1-The list box has the multi extended selection mode enabled.
2-The double-click on an item opens a form with the selected item properties.
3-The right click opens a context menu.

I've tried to use a custom control that I found on this forum, but I still have bugs with the double click, sometimes "enables" the drag and drop instead of opening the properties form. Here is the custom control I'm using:
https://www.vbforums.com/showthread....=1#post3079759

Here are the methods I'm using:

Code:

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Private Sub ListBox_DataBaseSFX_MouseMove(sender As Object, e As MouseEventArgs) Handles ListBox_DataBaseSFX.MouseMove
        If sender IsNot Nothing AndAlso e.Button = MouseButtons.Left AndAlso e.Clicks = 1 Then
                ListBox_DataBaseSFX.DoDragDrop(ListBox_DataBaseSFX.SelectedItems, DragDropEffects.Move)
        End If
End Sub

Private Sub ListBox_DataBaseSFX_MouseDoubleClick(sender As Object, e As MouseEventArgs) Handles ListBox_DataBaseSFX.MouseDoubleClick
        'Ensure that we have selected an item
        Dim itemIndex = ListBox_DataBaseSFX.IndexFromPoint(e.Location)
        If itemIndex <> ListBox.NoMatches Then
                'Get item and file path
                Dim selectedSFX As String = ListBox_DataBaseSFX.Items(itemIndex)
                'Open editor
                Dim sfxEditor As New SfxEditor(selectedSFX)
                sfxEditor.ShowDialog()
        End If
End Sub

Private Sub ListBox_DataBaseSFX_DragOver(sender As Object, e As DragEventArgs) Handles ListBox_DataBaseSFX.DragOver
        e.Effect = DragDropEffects.Copy
End Sub

Private Sub ListBox_DataBaseSFX_DragDrop(sender As Object, e As DragEventArgs) Handles ListBox_DataBaseSFX.DragDrop
        If e.Effect = DragDropEffects.Copy AndAlso ListBox_DataBases.SelectedItems.Count > 0 Then
                If e.Data.GetDataPresent(GetType(ListBox.SelectedObjectCollection)) Then
                        Dim itemsData As ListBox.SelectedObjectCollection = e.Data.GetData(GetType(ListBox.SelectedObjectCollection))
                        For Each data As String In itemsData
                                ListBox_DataBaseSFX.Items.Add(data)
                        Next
                End If
        End If
End Sub

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EDIT:
This custom control, gives me the option to select rows by clicking one row and dragging it, as we can do in Excel, for example. The idea is to combine this with the drag and drop and also allowing the double click.

To start, sender will never be Nohing in your MouseMove event, sender is the Control that raised the event.
I’d use the MouseDown event, checking for a double click with a windows API. I don’t remember the name, I’ll find it for you…

Quote:

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Originally Posted by .paul.

To start, sender will never be Nohing in your MouseMove event, sender is the Control that raised the event.
I’d use the MouseDown event, checking for a double click with a windows API. I don’t remember the name, I’ll find it for you…

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Yeah, I've tried using the MouseDown event, but the problem is that I can't select multiples items with the mouse, when I press the mouse button and I move down, I can select multiples items, but using this event, I can't do it.

This is how to get double click time

https://docs.microsoft.com/en-us/dot...owsdesktop-6.0

Not sure which version that was released with, so try it.

In your Form_Load, set a Form level variable to Environment.TickCount
In your ListBox_MouseDown, check if it’s a doubleclick by subtracting last click time from Environment.TickCount
Set your last clicked time variable to Environment.TickCount

Process single click code
If double click, then also process double click code

Here’s an example, which is almost what I’ve described above, but it’ll work for you…

https://www.vbforums.com/showthread....stview-listbox

Quote:

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Originally Posted by .paul.

Here’s an example, which is almost what I’ve described above, but it’ll work for you…

https://www.vbforums.com/showthread....stview-listbox

---

Hmm, not sure how to implement it, could you give me another example?
The problem here is that if I use the MouseDown, conflicts with the mouse multi selection.

So the thing is, this custom control, gives me the option to select rows by clicking one row and dragging it, as we can do in Excel, for example. The idea is to combine this with the drag and drop and also allowing the double click.
Any idea about what should I modify to make it working?

btw, sorry for my bad English, is not my first language.

Try this...

Code:

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Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim items() As String = {"one", "two", "three", "four", "five"}
        ListBox1.Items.AddRange(items)
    End Sub

    Private Sub ListBox2_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox2.DragDrop
        For Each item As Object In (e.Data.GetData(GetType(ListBox.SelectedObjectCollection)))
            ListBox2.Items.Add(item)
        Next
    End Sub

    Private Sub ListBox2_DragOver(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox1.DragOver, ListBox2.DragOver
        If (e.Data.GetDataPresent(GetType(ListBox.SelectedObjectCollection))) Then
            e.Effect = DragDropEffects.Move
        Else
            e.Effect = DragDropEffects.None
        End If
    End Sub

    Private Sub ListBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.DoubleClick
        'doubleclicked
        'Ensure that we have selected an item
        Dim itemIndex = ListBox1.IndexFromPoint(ListBox1.PointToClient(MousePosition))
        If itemIndex <> ListBox.NoMatches Then
            'Get item and file path
            'Dim selectedSFX As String = ListBox1.Items(itemIndex)
            'Open editor
            'Dim sfxEditor As New SfxEditor(selectedSFX)
            'sfxEditor.ShowDialog()
            MsgBox(ListBox1.Items(itemIndex))
        End If
    End Sub

End Class

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This is the extended ListBox. Add the class to your project, rebuild your project, then you'll find MultiSelListBox at the top of your toolbox...

Code:

---

Public Class MultiSelListBox
    Inherits ListBox

    Private MouseDownOnIndex As Integer
    Private bMouseDownOnSelection As Boolean
    Private bMouseDownOutsideSelection As Boolean
    Private Const WM_LBUTTONDOWN As Integer = &H201
    Private Const WM_LBUTTONUP As Integer = &H202
    Private Const WM_MOUSEMOVE As Integer = &H200
    Private Const MK_LBUTTON As Integer = &H1&
    Private lastClickedPosition As Point

    Protected Overrides Sub OnCreateControl()
        lastClickedPosition = Point.Empty
        MyBase.OnCreateControl()
    End Sub

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        Select Case m.Msg
            Case WM_LBUTTONDOWN
                Dim pt As New Point(m.LParam.ToInt32)
                MouseDownOnIndex = Me.IndexFromPoint(pt)
                If Me.SelectedItems.Count >= 1 _
                    And Me.SelectedIndices.Contains(MouseDownOnIndex) _
                        And m.WParam = MK_LBUTTON Then
                    bMouseDownOnSelection = True
                    lastClickedPosition = pt
                    Return
                Else
                    bMouseDownOutsideSelection = True
                    lastClickedPosition = Point.Empty
                    MyBase.WndProc(m)
                End If
            Case WM_MOUSEMOVE
                If bMouseDownOnSelection Then
                    Dim pt As New Point(m.LParam.ToInt32)
                    If Math.Abs(pt.X - lastClickedPosition.X) < 3 OrElse _
                        Math.Abs(pt.Y - lastClickedPosition.Y) < 3 Then
                        Me.DoDragDrop(Me.SelectedItems, DragDropEffects.Move)
                    End If
                End If
                bMouseDownOnSelection = False
                MyBase.WndProc(m)
            Case WM_LBUTTONUP
                Dim pt As New Point(m.LParam.ToInt32)
                If MouseDownOnIndex = Me.IndexFromPoint(pt) _
                    And m.WParam = 0 And Not bMouseDownOutsideSelection Then
                    Dim down As New Message()
                    down.HWnd = m.HWnd
                    down.Msg = WM_LBUTTONDOWN
                    down.WParam = m.WParam
                    down.LParam = m.LParam
                    down.Result = IntPtr.Zero
                    MyBase.WndProc(down)
                    lastClickedPosition = Point.Empty
                End If
                bMouseDownOutsideSelection = False
                MyBase.WndProc(m)
            Case Else
                MyBase.WndProc(m)
        End Select
    End Sub

End Class

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Quote:

---

Originally Posted by .paul.

Try this...

Code:

---

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim items() As String = {"one", "two", "three", "four", "five"}
        ListBox1.Items.AddRange(items)
    End Sub

    Private Sub ListBox2_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox2.DragDrop
        For Each item As Object In (e.Data.GetData(GetType(ListBox.SelectedObjectCollection)))
            ListBox2.Items.Add(item)
        Next
    End Sub

    Private Sub ListBox2_DragOver(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox1.DragOver, ListBox2.DragOver
        If (e.Data.GetDataPresent(GetType(ListBox.SelectedObjectCollection))) Then
            e.Effect = DragDropEffects.Move
        Else
            e.Effect = DragDropEffects.None
        End If
    End Sub

    Private Sub ListBox1_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.DoubleClick
        'doubleclicked
        'Ensure that we have selected an item
        Dim itemIndex = ListBox1.IndexFromPoint(ListBox1.PointToClient(MousePosition))
        If itemIndex <> ListBox.NoMatches Then
            'Get item and file path
            'Dim selectedSFX As String = ListBox1.Items(itemIndex)
            'Open editor
            'Dim sfxEditor As New SfxEditor(selectedSFX)
            'sfxEditor.ShowDialog()
            MsgBox(ListBox1.Items(itemIndex))
        End If
    End Sub

End Class

---

This is the extended ListBox. Add the class to your project, rebuild your project, then you'll find MultiSelListBox at the top of your toolbox...

Code:

---

Public Class MultiSelListBox
    Inherits ListBox

    Private MouseDownOnIndex As Integer
    Private bMouseDownOnSelection As Boolean
    Private bMouseDownOutsideSelection As Boolean
    Private Const WM_LBUTTONDOWN As Integer = &H201
    Private Const WM_LBUTTONUP As Integer = &H202
    Private Const WM_MOUSEMOVE As Integer = &H200
    Private Const MK_LBUTTON As Integer = &H1&
    Private lastClickedPosition As Point

    Protected Overrides Sub OnCreateControl()
        lastClickedPosition = Point.Empty
        MyBase.OnCreateControl()
    End Sub

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        Select Case m.Msg
            Case WM_LBUTTONDOWN
                Dim pt As New Point(m.LParam.ToInt32)
                MouseDownOnIndex = Me.IndexFromPoint(pt)
                If Me.SelectedItems.Count >= 1 _
                    And Me.SelectedIndices.Contains(MouseDownOnIndex) _
                        And m.WParam = MK_LBUTTON Then
                    bMouseDownOnSelection = True
                    lastClickedPosition = pt
                    Return
                Else
                    bMouseDownOutsideSelection = True
                    lastClickedPosition = Point.Empty
                    MyBase.WndProc(m)
                End If
            Case WM_MOUSEMOVE
                If bMouseDownOnSelection Then
                    Dim pt As New Point(m.LParam.ToInt32)
                    If Math.Abs(pt.X - lastClickedPosition.X) < 3 OrElse _
                        Math.Abs(pt.Y - lastClickedPosition.Y) < 3 Then
                        Me.DoDragDrop(Me.SelectedItems, DragDropEffects.Move)
                    End If
                End If
                bMouseDownOnSelection = False
                MyBase.WndProc(m)
            Case WM_LBUTTONUP
                Dim pt As New Point(m.LParam.ToInt32)
                If MouseDownOnIndex = Me.IndexFromPoint(pt) _
                    And m.WParam = 0 And Not bMouseDownOutsideSelection Then
                    Dim down As New Message()
                    down.HWnd = m.HWnd
                    down.Msg = WM_LBUTTONDOWN
                    down.WParam = m.WParam
                    down.LParam = m.LParam
                    down.Result = IntPtr.Zero
                    MyBase.WndProc(down)
                    lastClickedPosition = Point.Empty
                End If
                bMouseDownOutsideSelection = False
                MyBase.WndProc(m)
            Case Else
                MyBase.WndProc(m)
        End Select
    End Sub

End Class

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Thank you very much!, That's what I've looking for :)