Undo/Redo

[Administrator]

Hi,
I am doing Undo/Redo
But Undo of the cell is happening but the Redo is not.
I did following steps similar to the Undo Redo sample:

this.m_PretestListingGrid.Model.CommandStack.Undo();
this.m_PretestListingGrid.Model.CommandStack.Redo();

After Undo when i checked the redo stack it is zero
this.m_PretestListingGrid.Model.CommandStack.RedoStack.Count;

Any idea why this is happening

Thankz
Pratiksha

[Administrator]

Do you see the problem in our sample?

It may have something to do with how you are triggerring the undo/redo. If you are using menu items or toolbar button, then the action is not triggerring validation. At the beginning of your menu/button handlers, try calling this.Invalidate() to see if this makes things work.

If you can upload a sample showing the problem, we can try to debug it here.

[Administrator]

hi,
When i analysed below,

I have PreprateviewStyleInfo in that i have following 3 lines
If i comment out thses lines Redo works.
Means they can not be done simultaneously?

Where these 3 lines should be called so that m_PretestListingGrid.Model.Cols.FreezeRange(0,1);
m_PretestListingGrid.Model.Cols.FreezeSelection();

//Hide the first column
m_PretestListingGrid.Model.Cols.Hidden[0] = true;

Where can above piece of the code called?
because when i do cut insert column or cut insert row in every case i have to set these properties.

>Do you see the problem in our sample?
>
>It may have something to do with how you are triggerring the undo/redo. If you are using menu items or toolbar button, then the action is not triggerring validation. At the beginning of your menu/button handlers, try calling this.Invalidate() to see if this makes things work.
>
>If you can upload a sample showing the problem, we can try to debug it here.

[Administrator]

You should not do such code in PrepareViewStyleInfo as that event is raised too often for such code.

I would wrap this code in a method, and then call this method whenever you need to, say after the line of code that you are using to cut/insert a row or column.