Are there any news about this Problem?

Thanks for reply!

fweeee said:

Its funny that you should ask that now. After working on this issue off and on since my previous post (5+ months), I finally arrived at a solution last night. Its dissapointing that I had to spend so much time (I would guess days) to acheive what I beleive should be standard functionality (or at least a standard option). But as far as I'm concerned, I couldnt release the application the way it was - it would just casue to many problems.

Anyway, enough with my rant, onto the solution. I created a class to do this, to save writing it in each form individually.

 declare an object varaible to store the value of the dropdown field:

Thank you for sharing your solution, you saved me a lot of time :-)

Now, I'll share my version of this solution.
I'm a VB developer, so i converted your solution in VB (and then, reconverted in C# using .Net Reflector ;-).

I've fixed 2 issue:

*) in the dropdown close-up event, the value is still the old one; to get the right value we need to look something like
Me.mUGrid.ActiveCell.ValueListResolved.GetValue(Me.mUGrid.ActiveCell.ValueListResolved.SelectedItemIndex)

*) I've added a KeyUp event handler to track the value change due to user keyboard interaction with the UDD control

The VB version works, I've converted it in C# using .Net reflector,  I don't know if it works, but at least it compile :-)

------------------------------------------------------------------

VB version

Imports Infragistics.Win.UltraWinGrid
Imports System.Windows.Forms



Public Class UltraGridUddMouseWheelHack


    Public mUgrid As UltraGrid

    Private mUddSavedValueForMouseWheelHack As Object


    Public Sub InigUltraGridUddMouseWheelHack()
        AddHandler Me.mUgrid.ControlAdded, AddressOf Me.mUGrid_ControlAdded
    End Sub


    Private Sub mUGrid_ControlAdded(ByVal sender As Object, ByVal e As ControlEventArgs)
        'Dim contType As String = sender.GetType().ToString()
        Dim uGrid As UltraGrid = DirectCast(sender, UltraGrid)
        Dim udd As UltraDropDown = TryCast(uGrid.ActiveCell.ValueListResolved, UltraDropDown)

        If (udd IsNot Nothing) Then
            AddHandler e.Control.MouseWheel, AddressOf mUGrid_uddControl_MouseWheel
            AddHandler e.Control.KeyUp, AddressOf mUGrid_uddControl_KeyUp
            AddHandler e.Control.Enter, AddressOf mUGrid_uddControl_Enter
            AddHandler udd.AfterCloseUp, AddressOf mUGrid_uddControl_AfterCloseUp
        End If

    End Sub


    Private Sub SaveUltraDropDownSelectedValue()
        '_dropdownValue = Me.mUGrid.ActiveCell.Value     'this one is wrong, when dthe dropdown close up, the activecell.value is still the old value; the grid update it later; so we need to picku up the corret value somwhere else (see down)

        If Me.mUgrid.ActiveCell IsNot Nothing AndAlso Me.mUgrid.ActiveCell.ValueListResolved IsNot Nothing Then
            mUddSavedValueForMouseWheelHack = Me.mUgrid.ActiveCell.ValueListResolved.GetValue(Me.mUgrid.ActiveCell.ValueListResolved.SelectedItemIndex)
        End If
    End Sub


    Private Sub mUGrid_uddControl_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs)
        'this tack the value change due to keyboard interaction
        SaveUltraDropDownSelectedValue()
    End Sub



    Private Sub mUGrid_uddControl_AfterCloseUp(ByVal sender As Object, ByVal e As DropDownEventArgs)
        'this tack the selected value on dropdown close-up
        SaveUltraDropDownSelectedValue()
    End Sub



    Private Sub mUGrid_uddControl_Enter(ByVal sender As Object, ByVal e As EventArgs)
        'save the current value, used in case the user don't change the current value, but still use the mouse wheel

        Dim senderControl As Control = DirectCast(sender, Control)
        Dim uGrid As UltraGrid = TryCast(senderControl.Parent, UltraGrid)

        If (uGrid IsNot Nothing) Then
            Dim dropdown As UltraDropDown = TryCast(uGrid.ActiveCell.ValueListResolved, UltraDropDown)

            If (dropdown IsNot Nothing) Then
                mUddSavedValueForMouseWheelHack = uGrid.ActiveCell.Value
            End If

        End If

    End Sub




    Private Sub mUGrid_uddControl_MouseWheel(ByVal sender As Object, ByVal e As MouseEventArgs)
        Dim conSender As Control = DirectCast(sender, Control)
        Dim ugSender As UltraGrid = DirectCast(conSender.Parent, UltraGrid)


        If (ugSender IsNot Nothing) Then

            Dim dropdown As UltraDropDown = TryCast(ugSender.ActiveCell.ValueListResolved, UltraDropDown)

            If (dropdown IsNot Nothing) AndAlso (Not dropdown.IsDroppedDown) Then

                'we need to restore the saved value because when this event handler is called, the
                'udd current value has ALREADY been changed by this event, and this is exactly what mustn't happen
                ugSender.ActiveCell.Value = mUddSavedValueForMouseWheelHack

                'from now-on, the mouse wheel will scroll the grid :-)
                ugSender.PerformAction(UltraGridAction.ExitEditMode, False, False)

            End If

        End If

    End Sub

End Class
 

------------------------------------------------------------------

C# version 

using Infragistics.Win.UltraWinGrid;
using System.Windows.Forms;
using System;



public class UltraGridUddMouseWheelHack
{
    private object mUddSavedValueForMouseWheelHack;
    public UltraGrid mUgrid;

    public void InigUltraGridUddMouseWheelHack()
    {
        this.mUgrid.ControlAdded += new ControlEventHandler(this.mUGrid_ControlAdded);
    }

    private void mUGrid_ControlAdded(object sender, ControlEventArgs e)
    {
        UltraGrid uGrid = (UltraGrid) sender;
        UltraDropDown udd = uGrid.ActiveCell.ValueListResolved as UltraDropDown;
        if (udd != null)
        {
            e.Control.MouseWheel += new MouseEventHandler(this.mUGrid_uddControl_MouseWheel);
            e.Control.KeyUp += new KeyEventHandler(this.mUGrid_uddControl_KeyUp);
            e.Control.Enter += new EventHandler(this.mUGrid_uddControl_Enter);
            udd.AfterCloseUp += new DropDownEventHandler(this.mUGrid_uddControl_AfterCloseUp);
        }
    }

    private void mUGrid_uddControl_AfterCloseUp(object sender, DropDownEventArgs e)
    {
        this.SaveUltraDropDownSelectedValue();
    }

    private void mUGrid_uddControl_Enter(object sender, EventArgs e)
    {
        Control senderControl = (Control) sender;
        UltraGrid uGrid = senderControl.Parent as UltraGrid;
        if (uGrid != null)
        {
            UltraDropDown dropdown = uGrid.ActiveCell.ValueListResolved as UltraDropDown;
            if (dropdown != null)
            {
                this.mUddSavedValueForMouseWheelHack = uGrid.ActiveCell.Value;
            }
        }
    }

    private void mUGrid_uddControl_KeyUp(object sender, KeyEventArgs e)
    {
        this.SaveUltraDropDownSelectedValue();
    }

    private void mUGrid_uddControl_MouseWheel(object sender, MouseEventArgs e)
    {
        Control conSender = (Control) sender;
        UltraGrid ugSender = (UltraGrid) conSender.Parent;
        if (ugSender != null)
        {
            UltraDropDown dropdown = ugSender.ActiveCell.ValueListResolved as UltraDropDown;
            if ((dropdown != null) && (!dropdown.IsDroppedDown))
            {
                ugSender.ActiveCell.Value = this.mUddSavedValueForMouseWheelHack;
                ugSender.PerformAction(UltraGridAction.ExitEditMode, false, false);
            }
        }
    }

    private void SaveUltraDropDownSelectedValue()
    {
        if ((this.mUgrid.ActiveCell != null) && (this.mUgrid.ActiveCell.ValueListResolved != null))
        {
            this.mUddSavedValueForMouseWheelHack = this.mUgrid.ActiveCell.ValueListResolved.GetValue(this.mUgrid.ActiveCell.ValueListResolved.SelectedItemIndex);
        }
    }
}
 

------------------------------------------------------------------ 

dwolf81 said:

Thanks for posting this, really helped me out.  Instead of saving the orignal value and reseting it you can actually just do a UltraGrid1.ActiveCell.CancelUpdate().

No problem. I still hope that Infragistics at least gives us an option to do something like this standard.

 I tried the CancelUpdate() thing, but that doesnt work quite the way I want it to. If the user selects a value from the drop down, and then scrolls down, it will revert back to the original value - not the one the user selected. I want it to stay on the value the user selected.

Thanks for posting this, really helped me out.  Instead of saving the orignal value and reseting it you can actually just do a UltraGrid1.ActiveCell.CancelUpdate().

 Its funny that you should ask that now. After working on this issue off and on since my previous post (5+ months), I finally arrived at a solution last night. Its dissapointing that I had to spend so much time (I would guess days) to acheive what I beleive should be standard functionality (or at least a standard option). But as far as I'm concerned, I couldnt release the application the way it was - it would just casue to many problems.

Anyway, enough with my rant, onto the solution. I created a class to do this, to save writing it in each form individually.

 declare an object varaible to store the value of the dropdown field:

Then I add a ControlAdded event (ugSender is an UltraGrid):

In ControlAdded event, put the code:

 The uddSender_AfterCloseUp event looks like this:

 The Control_Enter event looks like this:

And the Control_MouseWheel event looks like this:

Whats happening here is:

1. When the user first enters the field, it records what the current value is (in _dropdownValue)
2. When the user changes the value by selecting it from the dropdown (in uddSender_AfterCloseUp) it is assigning the new value to _dropdownValue)
3. When the user uses the mousewheel, and the dropdown is not dropped down (in Control_MouseWheel), the code will change the ActiveCell's value back to the last selected value (_dropdownValue) as the mouse scrolling has already moved it one up or down at this point, and it then takes the control out of edit mode, so any subsequent mouse scrolls will scroll the whole ultragrid, as it should.

A few points.

I havnt really accounted for the user selecting a value by other means. I'm assuming if the user selects a value by typing something in, they will tab or enter to select it, which will then move the focus to another field - so there is no real issue here (I think).

I havnt really tested this a great deal. As I said, I just worked out this solution last night, so only basic testing has been done so far. If you find ways to improve it, please post it back here! 

 --- EDIT ---

 The Control_MouseWheel event needs a little additional code, so that both of the lines:

                    _ultraGrid.ActiveCell.Value = _dropdownValue;

                    ugSender.PerformAction(UltraGridAction.ExitEditMode, false, false);

Are within another conditional statement

if (!dropdown.IsDroppedDown)

I did say I hadnt tested it much...