I am trying to build a generic slider control using RadSlider for Silverlight using MVVM. I am able to successfully bind the Maximum and Minimum values. However, SelectionStart and SelectionEnd I am just not able to get it to work using data binding. Am I missing something?
Here is some code...
ViewModel
public
class MainViewModel : ViewModelBase
{
//keys
private Double _maximumNumberOfKeys;
public Double MaximumNumberOfKeys
{
get
{
return _maximumNumberOfKeys;
}
set
{
_maximumNumberOfKeys =
value;
OnPropertyChanged(
"MaximumNumberOfKeys");
}
}
private Double _selectedMaxNumberOfKeys;
public Double SelectedMaxNumberOfKeys
{
get
{
return _selectedMaxNumberOfKeys;
}
set
{
_selectedMaxNumberOfKeys =
value;
OnPropertyChanged(
"SelectedMaxNumberOfKeys");
}
}
public MainViewModel()
{
this.MaximumNumberOfKeys = 200;
this.SelectedMaxNumberOfKeys = 200;
OnPropertyChanged(
"MaximumNumberOfKeys");
OnPropertyChanged(
"SelectedMaxNumberOfKeys");
}
}
UI
<
telerik:RadSlider Minimum="0"
Maximum="{Binding MaximumNumberOfKeys}"
SelectionStart="0"
SelectionEnd="{Binding SelectedMaxNumberOfKeys}"
MinimumRangeSpan="0"
MaximumRangeSpan="{Binding MaximumNumberOfKeys}"
IsSelectionRangeEnabled="True"
TickPlacement="TopLeft" />
Thanks
--tolga
6 Answers, 1 is accepted
I believe this issue has been fixed with our Beta release, so could you please download the Beta binaries -2010.3.1018.1040 and test your project with them. If this is not an option, we have a Q3 release which is scheduled for the middle of this month.
Let me know how I can be of further assistance.
Kiril Stanoev
the Telerik team
Rank 2
<telerik:RadSlider TickFrequency="0.1" TickPlacement="BottomRight" IsSelectionRangeEnabled="True" Minimum="0" Maximum="1" MaximumRangeSpan="1" MinimumRangeSpan="0" SelectionEnd="{Binding value_rating_max, Mode=TwoWay}" SelectionStart="{Binding value_rating_min, Mode=TwoWay}"/>In code-behind I create a new item with value_rating_max = 0.6 and value_rating_min = 0.4 and bind it to the slider (DataContext). When the slider is created/initiated the first time SelectionStart is reset to 0 and SelectionEnd is set to 0.4.
If I create an identical item and bind it to the slider everything is OK; something happens after the first binding that makes subsequent bindings work, but I can't figure out what. I've tried switching the order of SelectionStart, SelectionEnd, Minimum and Maximum, but nothing works.
Rank 2
Dim _new_item = New my_data_item _new_item.value_rating_min = 0.4 _new_item.value_rating_max = 0.6 RadSlider1.DataContext = _new_itemAs I said in the previous post the slider resets value_rating_min to 0 and value_rating_max = 0.4 on first time init (subsequent bindinds work).
However, if I change the code-behind to:
Dim _new_item = New my_data_item _new_item.value_rating_min = 0.41 _new_item.value_rating_max = 0.61 RadSlider1.DataContext = _new_itemEverything works all the time (?!). I don't know what is happening.
This appears to be a Bug in the RadSlider. We logged it in our PITS (Slider: In Silverlight, Setting the ViewModel of the Slider with SelectionStart = 0.4, Selection End = 0.6 after InitializeComponent doesn't work)
where you will be soon able to vote for. We also updated your telerik account points accordingly. Thank you for your cooperation.
Greetings,
Petar Mladenov
the Telerik team
Rank 2
http://www.telerik.com/support/pits.aspx#/public/silverlight/4668
Yes, the issues have similar character. We`ll investigate in depth but we cannot promise a release date when the fix will be available. Thank you for your cooperation again.
Greetings,
Petar Mladenov
the Telerik team