Virtual grid row heights

[Administrator]

Hello,
I am using .NET v1.1, Syncfusion v2.0.5.1.

I want to populate the grid in OnQueyCellInfo event (virtual grid) from another class. I have set the colwidths initially as constant (that i do not want to change), rather i would like to change the rowheights based on the data getting populated. I handled the QueryRowHeights and SaveRowHeights events to store the calculated height in a integer array. The issue is if I refresh the grid the row is populated and the row height is set to default size and then resize to fit based on the content. The grid is flickerring. how do i avoid this flickerring.
or do you have any samples for this scenario.

[Administrator]

Hi Dhans,

The flickering problem can be avoided by calling the Refresh method between the BeginUpdate() and EndUpdate() calls.

grid.BeginUpdate();
////code///
grid.EndUpdate( false );

Let me know if this helps.
Thanks,
Rajagopal

[Administrator]

Thanks for your reply Rajagopal.

Here with I am attaching the sample which produces the above said issue. If I do the refresh between begin and end updates, The grid does not resize the row heights correctly.

Click the "Fill Grid" button in the attached sample you could see the grid flicker.

Is there any work around for this issue, Or correct me if i am doing anything wrong.

Thanks,
Dhans

RowHeightResize.zip

[Administrator]

Hi Dhans,

Try calling the ResizeToFit method in button event instead of calling the Paint event. You need the first line to make sure the new row height generated by the resizetofit method is used by the grid when it redraws itself instead of any cached row heights. The last line forces the grid to redraw itself to show the new data and row height.

gridControl1.ResetVolatileData(); /////// Added.
rowheights = new int[ROW_COUNT];
this.gridControl1.RowCount = 0;
this.gridControl1.RowCount = ROW_COUNT;
SetColWidth();
gridControl1.RowHeights.ResizeToFit(Syncfusion.Windows.Forms.Grid.GridRangeInfo.Rows(1,this.gridControl1.RowCount ));

this.gridControl1.Invalidate(); /////Added.

Let me know if this is not what you needed.

Regards,
Haneef

[Administrator]

Haneef,
I have tried calling the ResizetoFit function along with ResetVolatile and Invalidate methods in between the BeginUpdate and EndUpdate Methods.
But the result is same, I have tried by unregistering the grid paint event also that did not work.

Thanks,
Dhans

[Administrator]

Hi Dhans,

I have modified the sample as per your requirement .Please refer to the attached sample and let us know if you are trying something different.

Here is a sample.
http://www.syncfusion.com/Support/user/uploads/RowHeightResize_eb09eae0.zip

Best Regards,
Haneef

[Administrator]

Thanks Haneef,
If i click on the "Fill Grid" button i could see the follwing message in the console output window. What could be the cause for this

"catched at Syncfusion.Windows.Forms.Grid.GridModelRowColSizeIndexer.SetRange(Int32 from, Int32 last, Int32[] values, Boolean discardUndo) in :line 0"

Thanks,
Dhans

[Administrator]

>Thanks Haneef,
> If i click on the "Fill Grid" button i could see the follwing message in the console output window. What could be the cause for this

>"catched at Syncfusion.Windows.Forms.Grid.GridModelRowColSizeIndexer.SetRange(Int32 from, Int32 last, Int32[] values, Boolean discardUndo) in :line 0"

Also, if i scroll down with line by line then it works fine, but if i drag the scroll button down then the rows are not resized to data height. only the last row of the visible row is resized.

I have changed the range of resizing cells in VerticallScroll event to all visible cells range then the grid starts flickering, if i drag the scroll bar to below some extend.

Thanks,
Dhans

[Administrator]

Also, I have modified my sample to populate the grid with different data per row (vary the rowheights). Now, when i first click on the "Fill grid" button it populates the data, but the rowheights are not adjusted with the data present in the grid, you could see this by navigating grid down using arrow key (NOT SCROLL).
How can i set the rowheigths depending on the data populated to grid row?

Thanks,
Dhans

Mod_RowHeightResize.zip

[Administrator]

Hi Dhans,

Can you try the code below in the CurrentCellMoved event of the grid. This will help you.

GridCurrentCell cc = this.gridControl1.CurrentCell;
if(cc.MoveFromRowIndex != cc.MoveToRowIndex)
{
    this.gridControl1.RowHeights.ResizeToFit(this.gridControl1.ViewLayout.VisibleCellsRange);        this.gridControl1.InvalidateRange(this.gridControl1.ViewLayout.VisibleCellsRange);
}

Thanks,
Rajagopal

[Administrator]

Hi Dhans,

Can you try the code below in the CurrentCellMoved event of the grid. This will help you.

GridCurrentCell cc = this.gridControl1.CurrentCell;
if(cc.MoveFromRowIndex != cc.MoveToRowIndex)
{
    this.gridControl1.RowHeights.ResizeToFit(this.gridControl1.ViewLayout.VisibleCellsRange);
    this.gridControl1.InvalidateRange(this.gridControl1.ViewLayout.VisibleCellsRange);
}

Thanks,
Rajagopal