Hello,

I have an issue where I need some help. I am creating an WPF MVVM application. I have a view with in it displayed a RadGridView. One of the columns of this gridview is a GridViewComboBoxColumn. See code
              
I have in the ViewModel a ObservableCollection named "ObservDistributions". This all works perfectly. The issue is where I change the value of the GridViewComboBoxColumn. I use MouseDoubleClick to send the changes from the View to the ViewModel.  In the acb:CommandBehavior.CommandParameter I sent the item to the ViewModel with a command. This all works but not for the GridViewComboBoxColumn. The changes made to the GridViewComboBoxColumn are not sent to the ViewModel. I think the issue is with the DataMemberBinding in the GridViewComboBoxColumn. I have used the DateTimePickerColumn from Telerik, changes made with this control works fine.

Does anyone have some hint in what direction to look.

Thanx in advance

Stefan

I can insert a comment but when I try to type in the comment I can only type one letter and then the cursor moves back to the document area.

I'm trying to get the word I just wrote.
I tried these methods.

private void EditorPreviewEditorKeyDown(object sender, PreviewEditorKeyEventArgs e)
{

  var word = radRichTextBox.Document.CaretPosition.GetCurrentWord();
or... var word = radRichTextBox.Document.CaretPosition.GetCurrentSpanBox().Text;.

But none of them gives me the desired result.
Do they work in Wpf? What do they do? How could I get the word 'at the caret'?
Where can I read (wpf)documentation about this?

If I have the following column in a radgrid, could someone help me with code behind on how to set the image source programtically based on a column value?

<telerik:GridViewColumn Header="Notes" Width="50">

<telerik:GridViewColumn.CellTemplate>

<DataTemplate>

<telerik:RadButton Name="btnObj" Height="25" Width="25" Click="btnObj_Click">

<telerik:RadButton.Content>

<Image Name="imgNotes" Source="/Images/notes.png" Height="16" Width="16" />

</telerik:RadButton.Content>

 

</telerik:RadButton>

</DataTemplate>

</telerik:GridViewColumn.CellTemplate>

Am I mistaken in understanding that the RadChart control cannot recognize beyond the Day component of a DateTime with regards to specificity. I plotted five values and they all appeared along the origin. Their X-values were different by seconds.

I have some logic that will determine what style should be used on a per cell basis. Is there a way to have a style selector for the cells in the scheduler?

Hi,

I have a chart (Line) bound to an ObservableCollection containing objects with a DateTime and an int value.
There are a number of problems I ran into with this solution.
So let me first explain the solution (desired result).
The YAxis should display values from 0 to 255 (byte range).
The XAxsi should display a certain number of seconds from the beginning of the data to the end.
To explain it assume 10 seconds of display.
So I check the first datapoint subtract 0.5 seconds (for better display) and set this as XMin.
Then I add 10 seconds and set this as XMax.

While running the programm I add values to the collection and if the latest value is older than the first value + 10 seconds I remove items from the front of the collection.
So what I get is a "growing" display of datapoint - than a "scroll" and again it adds data point....
I have this working - but now my problems (I guess I do something wrong) start.
You can imagine the solution as some kind of "live trend display".

Here the code to setup the chart.
By the way: DataPoints near 0 (0-15) have their label outside the chart - only partial visible

First problem:
When I add the first entry (my collection has one entry) I see a little part of a line - but not no DataPoint (label).

The next problems.
For YAxis I have min==0 max==255 (or 260 if this would help - it doesn't)
I messed around a lot with YAxis settings to have a scale showing 0, 50, 100, 150, 200, 255 (250 or 260 would be OK also).
The Step property doesn't help.
If I set it to 50 I get 51, 102, 153, 205, 255
Setting it to 49, 48 and 47 brings the same result.
With 46 I get 42.5, 85, 127,5.... :)
The only solution I found was to clear the TickPoints and add my values manually.
The problem - the TickPoints are newly created after I bind the data.
I solved this (although I don't understand why it is like this - I said "AutoRange" to off) by clearing / adding the ticks AFTER data binding.

When I reach the end of the space in the chart I do some kind of scroll. This means I remove the first xxx Items till the data fits again.
And because I have "manual XAxis" I change the XMinValue and the XMaxValue to reflect the changes.
The code looks (shoul look) like this:

Here is the next Problem:
AxisX seems to "forget" the setting for Step when I do this.
So I have to set it again!!!

And the next "interesting" thing:
 YAxis also resets it's TickPoints after I do this
So I have to set the values again.
Finally I had to use:

I guess I do something wrong because:
a.) Why should the chart overwrite settings I made when I change a ( totally different) setting
--like with XMinValue and XMaxValue which overrides AxisY.TickPoints
b.) Why should the chart change my TickPoints when I bind data?
--although I told it that I don't want AutoRange
c.) Why is there no easy way to tell the chart "pleas divide my XAxis to seconds"
--OK - would not help here - I need the "free space" to add points (and I found no X-Range property)
--I tried "continuous" scrolling (simply adding a point to the end - and remove on on the front of my collection)
--This flickers so much - unusable :(
d.) Why is "step" for the AxisY divider and not step?
--If Step 50 would (on 0 to 255) would bring 0, 50, 100, 150, 200, 250) would be great (and expected)

My Intention (and the results from what I found):
Have a chart with Y-Labels 0, 50, 100, 150, 200, 250 (or 255)
Has to be done manually - no problem if these values wouldn't been overridden by databind or changing XAxis min / max.
Have an XAxis with a label every second and a display range of 15 seconds (just a number).
Not possible
- I found no way to declare "1 second label distance"
- I found no way to say "XRange 30 seconds"
So I had to do it manually.
But I ran in the problem that AxisX.Step is overwritten when I change the min/max.

I hope someone can tell me what I'm doing wrong.
I have it working - but I guess what I do is "hacking in the dark" :)

Regards

Manfred

Hi,

is there any example for a dynamic mvvm Model based on a sql-database?

thanks
regards
ww

Hi,

How I can improve the radChart performance when I do a (Window) resizing or zooming ?

I need to show several lineseries with several thousand of points. I'm okay of loading the data to series (it takes around 2-3sec) but after that if I wan't to do windows resizing or zooming, it's lock the UI and takes more than 10sec (if I have 5 series or more loaded to screen) to refresh the screen !!??

I really need to show the actual data so I cannot use the SamplingThreshold - feature

Can I disable redraw or something during the zooming/resizing?

Here's the full code of my demo project.

Hi!

To show / hide a pane, I set the IsHidden property to either true or false, this has always worked.

But with the latest release, I get some strange behaviour. If the pane is starting out as hidden (IsHidden = true) when I start the application and the user later changes this through a command (IsHidden = false), the pane is expanded, but without any content (ie the grid inside is not shown).

Am I doing something wrong?