Questions on UI for WinForms Forum

9 answers

765 views

How do you detect what data item a user clicks on with the mouse.
For example a user clicks on a certain piece of a pie chart or a specific bar on a barchart. Another possible feature would be to detect the X position in a line chart while the mouse hovers over it so you could display the Y value.

John Schneider

Chart (obsolete as of Q1 2013)

answered on 17 Dec 2011

1 answer

170 views

DocumentTabStrip Close Button hovered image

Hi Telerik

I want to replace the image displayed when ShowCloseButton is active on a document tabstripitem while maintaining its hover and pressed image behaviour.

I create the dodument window at run time and I can get the image to change to a static image using the following line

            document.TabStripItem.CloseButton.Image = Resources.GreenTickNormal22;

where "document" is typeof(DocumentWindow)

I also have added the following lines to get the image to change but these lines don't seem to be working

            document.TabStripItem.CloseButton.ImageHovered = Resources.GreenTickHover22;;
            document.TabStripItem.CloseButton.ImageClicked = Resources.GreenTickClick22;

Am I missing and event somewhere which needs to be raised?

Regards
Ian Carson

Dock

answered on 16 Dec 2011

2 answers

118 views

Rad grid Hierarchy of one to many relations

Hi,

I have rad grid as per my requirement I need to show the details in one to many relations. As per my finding I found that it will possible on tab wise(Side by side)

http://www.telerik.com/help/winforms/gridview-hirarchical-grid-hierarchy-of-one-to-many-relations.html.

But my requirement is one to many relations is one followed by another not side by side.

Please let us know what we need to do to get this to work.

THANKS!

GridView

answered on 16 Dec 2011

1 answer

129 views

Row editing ?

Hello,

Using a RadGridView to make operation on a datatable/dataset,

If I create or edit a record, and the click on another line, or event some times on another cell from the same line/record,

I get an exception in 'Program.cs' (the starter class generated by Visual Studio containing Main() method)
on line Application.Run(new MyForm());
It say 'NoNullAllowedException crosser a native/manager boundary.'/'Column ... does not allow null.'

It seems that this exception can not be caught so my app crashes.
It doesn't seem to be firing the cell end edit event.

I understand this come from the dataset validation.

If the user strictly can not click out of the row while all data are not filled and valid, I think that's too restrictive.

How could I catch or manager this exception in a more user friendly way ? If possible.

Thank you for help,

Thomas

GridView

answered on 16 Dec 2011

5 answers

162 views

SelectedObject: the Grid will be initialized again

I have the problem that, when i use the SelectedObject method from the propertygrid then will be the grid initialized again.
and the current view from the grid will be set to the default view. for example (all open properties will be closed)

the WindowsForm PropertyGrid do this not!
how can i change this behavior?

BR
Sebastian

PropertyGrid

answered on 15 Dec 2011

10 answers

341 views

Does ExportToExcelML support exporting child templates?

If yes, then when I try to export, I get this error...

System.InvalidOperationException: {"Could not find neighbour element!"}

and the stack trace is at

Telerik.WinControls.UI.Export.ExportToExcelML.SearchForNeighbourElement(List`1 radElementList, Int32 index) at Telerik.WinControls.UI.Export.ExportToExcelML.CreateStyleElement(GridViewRowInfo gridViewRowInfo, Int32 cellIndex) at Telerik.WinControls.UI.Export.ExportToExcelML.CreateRowElement(WorkBookElement workbook, GridViewRowInfo gridViewRowInfo) at Telerik.WinControls.UI.Export.ExportToExcelML.AddWorkSheetWithHeaderRow(WorkBookElement workbook, FileStream fileStream, Int32& currentSheet, Int32& currentRow) at Telerik.WinControls.UI.Export.ExportToExcelML.RunExport(String fileName)

The code being used is

Dim cc As New ExportToExcelML(grid)

cc.ExportVisualSettings = True

cc.RunExport(saveFileDialog1.FileName)

GridView

answered on 15 Dec 2011

5 answers

280 views

Filtering Question

How can I keep the gridview from applying its filterdescriptor untill the user presses enter in the filtercell (or leaves the cell by tab or click ie: the cellEndEdit event has passed (with rowIndex == -1))?

eg:
i have a column and I enter the filter string "abc" by typing the 3 character. Normally the grid will first add the fitlerdescriptor A then AB then ABC. Now I would like the behaviour of my gridview to be abc + "LEAVES FILTERFIELD" and then apply only 1 filterdescriptor ABC..

I have tried using a boolean "holdFiltering" which i set to true when the cellBeginEdit is fired on RowIndex == -1 and then i set it back to false at cellEndEdit, but unfortunately the cellEndEdit is fired AFTER the FilterChanging event (where i used the holdFiltering to set the e.Cancel = true & return from the method), this resulted in no more filtering whatsoever ;-)

Can anyone point me to or show me a working code snippet?

thank you in advance!

GridView

answered on 15 Dec 2011

1 answer

112 views

FilterChanging question

The GridViewCollectionChangingEventArgs on the FilterChanging event does not appear to be updated correctly. After the first filter change event, subsequent filters do not update NewItems and OldItems correctly.

The NewItems(0) does not reflect the updated filtered text. However, the NewValue does show the updated text. The OldItems(0) always equals zero, but OldValue is correct.

In addition, if the filter operator changes, the same discrepancy occurs, however the NewValue and OldValue are changed to an number. I'm assuming it is the enumerator of the operator.

See the screenshot and code example. I've opened a support ticket in case it is an actual bug, but hoping it is not and I'm just using it incorrectly.

Imports System.ComponentModel

Public Class Form1

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load

Dim foo As New BindingList(Of Person)

Dim i As Integer

Do Until i = 100

foo.Add(New Person("Name " & i.ToString))

i = i + 1

Loop

RadGridView1.DataSource = foo

End Sub

Public Class Person

Property Name As String

Public Sub New(ByVal Name As String)

_Name = Name

End Sub

End Class

Private Sub RadGridView1_FilterChanging(sender As Object, e As Telerik.WinControls.UI.GridViewCollectionChangingEventArgs) Handles RadGridView1.FilterChanging

TextBox1.Text = e.NewItems(0).ToString

TextBox2.Text = e.NewValue

If e.OldItems IsNot Nothing Then

TextBox3.Text = e.OldItems(0).ToString

TextBox4.Text = e.OldValue

End If

End Sub

End Class

GridView

answered on 15 Dec 2011

3 answers

109 views

DropDownButton Problem

Hi, I had version Q2 2011 WinForms VISUAL Style Builder, and change to the NEW VERSION OF Q3 2011, but there were some problems with DropDownButton because I can not change the properties of the button or save the changes. This problem only happens with this element (DropDownButton). How can I solve the problem?

Best Regards, Rui Silva

Buttons, RadioButton, CheckBox, etc

answered on 15 Dec 2011

1 answer

115 views

MaskedEditBox ValueChanged

Hi!

I've been having trouble with the maskededitbox valuechanged event. Please check the following example:

Private Sub RadMaskedEditBox1_ValueChanging(sender As Object, e As System.ComponentModel.CancelEventArgs) Handles RadMaskedEditBox1.ValueChanging

MessageBox.Show("Value=" & RadMaskedEditBox1.Value)

End Sub

It does not show the proper value.

Also, I'd like to know if there is a way to disable the increase/decrease value using the up/down arrows.

Thanks for your help.

MaskedEditBox

answered on 15 Dec 2011