Grid Scrolling Issues

[Ivan Pelly]

Hi -

I'm having a couple issues with version 1.5.2 of the grid.

Problem #1, as you can see in the attached picture, moving the scrollbar all the way to the right doesn't scroll the grid all the way to the right.

Problem #2, if you scrub the scrollbar all the way to the right, then all the way back to the left, then click in the body of the scrollbar, the columns jump and look like their overlapping, as in picture #2.

Any help greatly appreciated. Thanks.

[Administrator]

After populating your grid in a manner that might change the row/column count (like swapping out a DataSource), try calling grid.UpdateScrollBars to make sure the scrollbars get updated to use the new row/column count. You also may have to call grid.Model.ResetVolatileData prior to updating teh scrollbars.

[Ivan Pelly]

I'm not changing the datasource after setting it. I tried your suggestion, but it didn't fix either problem. BTW - I am changing the order of some of the columns before displaying the grid (using Grid.Model.Cols.MoveRange...) Would you have any other suggestions? Thanks.

[Administrator]

Are you hiding columns as well? The picture suggests that scrollbars/grid layout have not been updated to reflect the actual display. Are you doing any special sizing of the grid clientarea or dynamically sizing columns in anyway.

If so, after you do this, you might try the UpdateScrollBars call and maybe a call to this.gridDataBoundGrid1.PerformLayout.

If you can post a sample project showing the problem, we cn try to spot what is causing it.

[Administrator]

Hi,

I am using 1.5.2.0 Databound grid. I have set my own column widths and assigned a datatable as data source. I am clearing the rows and loading more rows as part of my initialization code. It has a few hidden columns and row headers are hidden. My child form which contains this grid is shown as part of Tabbed MDI.

When the grid is shown intially, the grid horizontal scrollbar is not updated properly (pic1.jpg). If gives the following exception when the horizontal scrollbar thumb is dragged. If I resize the window or click the scroll right button, the grid updates the horizontal scrollbar. Also, when I move the horizontal scrollbar, it scrolls the thumb and none of the columns move for a while (pic2.jpg). After that it starts scolling the columns horizontally.

I tried calling dataBoundGrid.UpdateScrollBars()
and dataBoundGrid.PerformLayout(). It did not work.

Any ideas?

thanks,
- Reddy

--------------------------------------------
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ArgumentException: '0' is not a valid value for 'value'. 'value' should be between 'minimum' and 'maximum'.
at System.Windows.Forms.ScrollBar.set_Value(Int32 value)
at Syncfusion.Windows.Forms.ReflectScrollBar.set_Value(Int32 value)
at Syncfusion.Windows.Forms.ScrollBarWrapper.set_Value(Int32 value)
at Syncfusion.Windows.Forms.ScrollControl.OnHScroll(Object sender, ScrollEventArgs se)
at System.Windows.Forms.ScrollEventHandler.Invoke(Object sender, ScrollEventArgs e)
at Syncfusion.Windows.Forms.ScrollBarWrapper.OnInnerScroll(Object sender, ScrollEventArgs se)
at System.Windows.Forms.ScrollBar.OnScroll(ScrollEventArgs se)
at Syncfusion.Windows.Forms.ReflectScrollBar.WmReflectScroll(Message& m)
at Syncfusion.Windows.Forms.ScrollBarWrapper.WmReflectScroll(Message& m)
at Syncfusion.Windows.Forms.ScrollControl.WmHScroll(Message& m)
at Syncfusion.Windows.Forms.ScrollControl.WndProc(Message& msg)
at Syncfusion.Windows.Forms.Grid.GridControlBase.WndProc(Message& msg)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
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--------------------------------------------

[Administrator]

Dis you also try calling grid.Model.ResetVolatileData before calling UpdateScrollBars?

[Administrator]

Reddy, are you also moving columns in addition to hiding some others?

The reason to try calling ResetVolatileData is that the original scrollbars are created when your grid is added to the TabPage's Controls collection. And if you do this through the designer, this is before the grid's own properties are set through the designer. So, the initial scrollbar settings may not reflect the grid's initial setting.

[Administrator]

Can you also try with the 1.6 beta? We did some fixes with scrollbars. When rows/columns were hidden and/or also moved sometimes they went out of sync.

Stefan

[Administrator]

Hi Clay,

I tried calling
dataBoundGrid.Model.ResetVolatileData();
dataBoundGrid.UpdateScrollBars();
dataBoundGrid.PerformLayout();

It did not help. My datagrid has some hidden columns, but I am not moving any columns yet.

I will have to download 1.6beta and try. When is the actual release data of 1.6?

thanks,
- Reddy

[Administrator]

We don't have a release date for the 1.6 yet other than it should be soon. We consider the grid code in the current beta to be release code for the grid. The actual 1.6 release is waiting on 1 new control to be completed and tested.

[Administrator]

Hi,

I have downloaded and tried 1.6.0.6 rc version. The scrollbar initially is still showingup small. After I click on the left/right scroll button, it is getting adjusted properly. It is scrolling fine after that.

in 1.5.2.0, the scrollbar used to just move and columns used to move after a while(I have some hidden columns). This bug looks like is fixed.
But my initial scroll problem still exists.

Any pointers?

thanks,
- Reddy

[Administrator]

Is there any way you can reproduce this problem in a sample so we can see it here?