Questions on UI for WinForms Forum

4 answers

162 views

Strange Issue with a custom Column: custom CellType appears in incorrect cells

Greetings!

I'd love to know if there's a problem with my code or if this is some kind of bug in the GridView, as the result is very strange.

If I create a custom column by inheriting GridViewDataColumn, the cell for that column will appear correctly in its own column, but will also occasionally appear in other columns.

Steps to reproduce
This is not my actual implementation, but a much simplified bit of code that reproduces the problem - the custom column here just displays a button for testing purposes.

I am running Telerik Controls for Windows Forms 2010.3.10.1215

Create a form called "ManualBuildTest" with a RadGridView on it, called "Grid" (Dock: Fill). Then use the following code in the form:

public partial class ManualBuildTest : Form

{

public ManualBuildTest()

{

InitializeComponent();

}

private void ManualBuildTest_Load(object sender, EventArgs e)

{

var col1 = new DataLinkColumn(string.Empty);

col1.AllowGroup = true;

col1.HeaderText = "Requested By";

Grid.Columns.Add(col1);

var col = new GridViewTextBoxColumn();

col.AllowGroup = true;

col.ReadOnly = false;

col.HeaderText = "Position";

Grid.Columns.Add(col);

col = new GridViewTextBoxColumn();

col.AllowGroup = true;

col.ReadOnly = false;

col.HeaderText = "Organisation";

Grid.Columns.Add(col);

col = new GridViewTextBoxColumn();

col.AllowGroup = false;

col.ReadOnly = false;

col.HeaderText = "Work Phone";

Grid.Columns.Add(col);

col = new GridViewTextBoxColumn();

col.AllowGroup = false;

col.ReadOnly = false;

col.HeaderText = "Mobile";

Grid.Columns.Add(col);

col = new GridViewTextBoxColumn();

col.AllowGroup = false;

col.ReadOnly = false;

col.HeaderText = "E-Mail";

Grid.Columns.Add(col);

col = new GridViewTextBoxColumn();

col.AllowGroup = false;

col.ReadOnly = false;

col.HeaderText = "Fax";

Grid.Columns.Add(col);

var dcol = new GridViewDateTimeColumn();

dcol.AllowGroup = true;

dcol.ReadOnly = false;

dcol.HeaderText = "Date Requested";

Grid.Columns.Add(dcol);

col = new GridViewTextBoxColumn();

col.AllowGroup = true;

col.ReadOnly = false;

col.HeaderText = "Request";

Grid.Columns.Add(col);

col = new GridViewTextBoxColumn();

col.AllowGroup = true;

col.ReadOnly = false;

col.HeaderText = "Status";

Grid.Columns.Add(col);

col = new GridViewTextBoxColumn();

col.AllowGroup = true;

col.ReadOnly = false;

col.HeaderText = "Assigned To";

Grid.Columns.Add(col);

dcol = new GridViewDateTimeColumn();

dcol.AllowGroup = true;

dcol.ReadOnly = false;

dcol.HeaderText = "Request Completed";

Grid.Columns.Add(dcol);

col = new GridViewTextBoxColumn();

col.AllowGroup = true;

col.ReadOnly = false;

col.HeaderText = "Result of Request";

Grid.Columns.Add(col);

Grid.Rows.AddNew();

}

public class DataLinkColumn : GridViewDataColumn

{

public DataLinkColumn(string fieldName)

: base(fieldName)

{

}

public override Type GetCellType(GridViewRowInfo row)

{

if (row is GridViewDataRowInfo)

return typeof(DataLinkCellElement);

return base.GetCellType(row);

}

public class DataLinkCellElement : GridDataCellElement

{

private RadButtonElement _ctlButton;

public DataLinkCellElement(GridViewColumn column, GridRowElement row)

: base(column, row)

{

}

protected override void CreateChildElements()

{

base.CreateChildElements();

_ctlButton = new RadButtonElement();

_ctlButton.Text = "TEST";

_ctlButton.ShowBorder = true;

Children.Add(_ctlButton);

}

protected override void SetContentCore(object value)

{

_ctlButton.Text = value == null ? "(null)" : value.ToString();

}

If you then run the form, everything (usually) looks fine at first: the custom column appears in the first column as set (the cell contains a button with the word "(null)" in it for now).

But if you make sure that the window is small enough that the Grid's horizontal scrollbar appears, and scroll back and forth, the custom button is appearing in other cells sporadically (see the attachment for an example).

I've tried to match my code to existing code examples, and even tried it with the RadRadioButtonCellElement custom column from the Knowledge Base, and got the same result.

Is there something fundamentally wrong with my code?

FRASER TUSTIAN

GridView

answered on 20 Jan 2011

8 answers

214 views

Missing text: Click here to add new row in 2010 Q3

Hi

In 2010 Q2 SP2 in row for adding new rows there was text: Click here to add new row (or very similar). This text is missing in Q3 by default. How can I display this text in Q3 (in row for adding new rows)?

Reagrds

GridView

answered on 20 Jan 2011

3 answers

243 views

[Solved] Tab Alternate?

Hi,
Which control should i use in place of Tab,Because Tab control is obsolete in 2010.

Tabstrip (obsolete as of Q2 2010)

answered on 20 Jan 2011

1 answer

263 views

Removing a tree node

I have a treeview control bound to a BindingList. If I call .Remove() on one of the tree nodes, should it delete the underlying item in the BindingList? I checked the count before and after calling .Remove, and the count on the bindinglist is the same. I want the item to be deleted, so what do I need to do differently? Also, I have tried removing the items from the underlying BindingList, and have noticed that the tree nodes are not removed. I can add nodes to the bindinglist, and they will show up as new tree nodes, but I am having issues with removal. Thanks for any help!

Treeview

answered on 20 Jan 2011

1 answer

366 views

[Solved] Numeric Masks

Hello. I was trying setup a currency (C2) and a numeric custom mask (1 day, 5 days etc) for a SpinEdit and found that there is no direct support for masking. Instead, we have to use MaskedEdit for direct masking. Anyhow, I have easily setup the C2 mask for a MaskedEdit but I'm missing the Up/Down buttons and the built it Min/Mav value limits. On the other hand, I need to display a number post-fixed with " days". For example, user will enter "1" but the display will be like "1 days". Again, needed to have a Min/Max values limit here but can't get the desired from SpinEdit.

Objectives:

Easy Masking for SpinEdit (If possible)
Using SpinEdit or MaskEdit, Have custom mask: "1 day" or "10 days"

MaskedEditBox

answered on 20 Jan 2011

4 answers

235 views

[Solved] Spin Editor Styling

I'm familiar with making my own themes, but the SpinEditor does not seem to accept new colors for the "up/down arrows". I want a new fill color for those buttons.

I also followed the Spin Editor Styling Tutorial, but again nothing changes the arrow buttons from their default blue shading. Also, when I'm in the Visual Style Builder's design mode, the display of the button does not change at all as I pick the various "state" tabs. Everything works great with other controls, just not the spin editor. ??? - Aussie

SpinEditor

answered on 20 Jan 2011

2 answers

132 views

Cell Formatting

I have to export data from RadGridView to excel . I used RadGridViewExcelExporter class. How can I do to format for datetime column and to make alignment of cells in excel? Thanks.

GridView

answered on 20 Jan 2011

1 answer

222 views

[Solved] Disable Excel-Like filtering for certain columns only

Hello,

We have a gird with Excel-Like filtering enabled.
Is there a way to disable the Excel-Like filtering for certain columns only? For example, in some cases with many different dollar values in a column, it doesn't really make sense for the user to be able filter based on specific values only, not to mention that there is some kind of a rounding bug where you would check only one value in the list and it won't display any rows...
We still want to keep the old style filtering capabilities because they make more sense for some columns and disable only the Excel-Like functionality...
Again, we need to be able to do that on per column basis, not for the grid as a whole.

See screenshot for more details

Thanks in advance.

GridView

answered on 19 Jan 2011

3 answers

243 views

LoadLayout removes new columns

We are having a problem using LoadLayout with RadGrid after releasing a new version that has new columns added. It seems that LoadLayout completely replaces the original columns with those listed in the layout XML file, and the new columns are gone. They are not just hidden, they have been completely removed.

The only way that we have been able to solve this problem is to rename the XML file with every release, causing the previous saved layout to be ignored. This is very irritating to users because they may have made several changes to the default column layout and after an upgrade they have to start over.

Is there a way to still use LoadLayout to preserve the user's column and grouping preferences, but not destroy newly added columns?

GridView

answered on 19 Jan 2011

8 answers

822 views

[Solved] Display no rows found when no data is in datasource

Hello All,
I have a rad gridview for winforms. I am using Q3 SP 2010. I am trying to display NO DATA FOUND when we dont find any data in the dataset. I had a look at other forms and tried doing this.
me.radgridview.TableElement.Text="No data found"
But I am not able to access the "TableELement" property. I know with telerik it would be some where down the hierarchy. Any help would be great. Thanks in advance.

GridView

answered on 19 Jan 2011