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RefreshRange

Hi I do: grid.Model[row, col].CellValue = c._value grid.InvalidateRange(GridRangeInfo.Cell (row,col)); But it does not refresh graphically this single cell. If i call grid.beginupdate /End update without parameter, no graphical update if i use the Syncfusion.Windows.Forms.BeginUpdateOptions.Invalidate option it invalidates all the screen causing a huge CPU usage. As my refresh occur often this is a problem Any idea thanks B. Cliford

8 Replies

AD Administrator Syncfusion Team February 11, 2005 08:03 AM

Also what is the difference between RefreshRange and InvalidateRange


AD Administrator Syncfusion Team February 11, 2005 08:03 AM

Hi, I tried to reproduce the problem but it seems fine. In GridPad, SampleGrid.cs add the following lines: protected override void OnCurrentCellControlDoubleClick(ControlEventArgs e) { trace = true; int o = 0; for (int n = 2; n < 10; n++) { for (int c = 4; c < 8; c++) { if (o % 2 == 0) { BeginUpdate(BeginUpdateOptions.InvalidateAndScroll); Model[n, c].CellValue = o; EndUpdate(true); } o++; } } trace = false; base.OnCurrentCellControlDoubleClick (e); } bool trace = false; protected override void OnCellDrawn(GridDrawCellEventArgs e) { if (trace) Console.WriteLine("OnCellDrawn: {0} / {1}", e.RowIndex, e.ColIndex); base.OnCellDrawn (e); } You can kick off the test by double-clicking in a cell. If you want to go the InvalidateRange route you could use the following code: GridStyleInfo style = new GridStyleInfo(); style.CellValue = o; Model.SetCellInfo(n, c, style, StyleModifyType.Override, true, true); InvalidateRange(GridRangeInfo.Cell (n, c)); Update(); If you keep having problems that might be specific to your app then. Best is then to upload a sample project that demonstrates the problem. Stefan >Hi > >I do: >grid.Model[row, col].CellValue = c._value >grid.InvalidateRange(GridRangeInfo.Cell (row,col)); > >But it does not refresh graphically this single cell. >If i call grid.beginupdate /End update without parameter, no graphical update >if i use the Syncfusion.Windows.Forms.BeginUpdateOptions.Invalidate option it invalidates all the screen causing a huge CPU usage. >As my refresh occur often this is a problem >Any idea >thanks >B. Cliford


AD Administrator Syncfusion Team February 11, 2005 08:21 AM

I actually use the GrifPerf sample where i update frequently the cells. is it of any importance ? Thanks


AD Administrator Syncfusion Team February 11, 2005 08:30 AM

2 questions : -on the code you gave me i don''t understand why do you have to go through: Model.SetCellInfo(n, c, style, StyleModifyType.Override, true, true); InvalidateRange(GridRangeInfo.Cell (n, c)); Update(); Using directly grid.Model[row+1, col+1].CellValue is not good ? What the update does ? CAn i call it for all my changes ? Thanks -why this method is never called on the gridperf sample :OnDrawCellDisplayText


AD Administrator Syncfusion Team February 11, 2005 08:30 AM

2 questions : -on the code you gave me i don''t understand why do you have to go through: Model.SetCellInfo(n, c, style, StyleModifyType.Override, true, true); InvalidateRange(GridRangeInfo.Cell (n, c)); Update(); Using directly grid.Model[row+1, col+1].CellValue is not good ? What the update does ? CAn i call it for all my changes ? Thanks -why this method is never called on the gridperf sample :OnDrawCellDisplayText


AD Administrator Syncfusion Team February 11, 2005 03:34 PM

When you call Model[row, col].CellValue = newValue a lot is happening under the hood. Events are raised, possibly undo generation is created, notification is send out to all view to repaint. SetCellInfo is a more advanced method. It allows suppressing events being sent out. It also gives a faster way for setting the style information directly into a cell. See also the PopulateGrid sample for different method for filling the grid. Stefan >2 questions : >-on the code you gave me i don''t understand why do you have to go through: >Model.SetCellInfo(n, c, style, StyleModifyType.Override, true, true); >InvalidateRange(GridRangeInfo.Cell (n, c)); >Update(); > >Using directly >grid.Model[row+1, col+1].CellValue is not good ? > >What the update does ? CAn i call it for all my changes ? > >Thanks > >-why this method is never called on the gridperf sample :OnDrawCellDisplayText


AD Administrator Syncfusion Team February 12, 2005 04:25 PM

Stefan Excuse me to come back with the same question but it looks like all the grid if invalidated. I actually use the GrifPerf sample where i update frequently the cells. Is the Gridperf could affect the refresh method ? Thanks again


AD Administrator Syncfusion Team February 13, 2005 11:24 AM

Which grid are you using? I made the changes below in the virtual grid code in that sample, and RefreshRange only seems to be triggering drawing the single cell being changed.
private void btnInitGrid_Click(object sender, System.EventArgs e)
{
	this.useDataTableList = this.checkBoxUseDataViewSort.Checked;
	this.calculateMaxColumnWidth = this.checkBoxCalculateMaximumWidth.Checked;
	this.recordCount = Convert.ToInt32(this.textBoxRecordCount.Text);
	this.zipCount = Convert.ToInt32(this.textBoxZipCount.Text);
	this.useOptimizedListChangedEvent = checkBoxUseOptimizedListChangedEvent.Checked;
	this.InitializeGrid();
	this.grid.DrawCell += new GridDrawCellEventHandler(grid_DrawCell);
	t = new Timer();
	t.Tick += new EventHandler(t_Tick);
	t.Interval = 500;
	t.Start();
}
Timer t;
Random r = new Random();
private void t_Tick(object sender, EventArgs e)
{
	this.grid[2,2].CellValue = r.Next(100);
	this.grid.RefreshRange(GridRangeInfo.Cell(2,2));
}
int a = 0;
private void grid_DrawCell(object sender, GridDrawCellEventArgs e)
{
	Console.WriteLine(string.Format("{0}-({1},{2}", a++, e.RowIndex, e.ColIndex));
}

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