Questions on UI for WPF Forum

1 answer

54 views

Hi,

I've updated my application to 2009 Q1 and setting the color of the cell doesn't work anymore!

    
              <my:ColorConverter x:Key="ColorConverter"/>  
        
                                    <Style TargetType="{x:Type telerik:GridViewCell}">  
        
                                        <Setter Property="Background">  
        
                                            <Setter.Value> 
        
                                                <SolidColorBrush Color="{Binding Converter={StaticResource ColorConverter}}"></SolidColorBrush> 
        
                                            </Setter.Value> 
        
                                        </Setter> 
        
                                    </Style>

The color converter returns a Color.Red.

Any ideas?

Regards

GridView

answered on 03 Apr 2009

2 answers

209 views

RadGauge Memory Leak problem

Hi

currently I'm building the application that perform some kind of monitoring.

For displaying the information I'm using all kinds of RadGauge (i.e. Circular, Linear, Digital).

All is fine and the controls look amazing, however I have found that the application has a memory problem

(i.e. more time the application is running - more memory it has been using). The application doesn't use any kind of saving the history, I mean that it is just Real Time Monitoring - thats why there shouldn't be increasing memory size used by the application.

In general the application architecture is very simple and as I have found later it is quite similar to those you are using in the demo example (i.e. CarDashboard Gauge WPF example).

So, in general I have an object that has a list of monitoring properties, the object itself derived from INotifyPropertyChanged interface to be able to reflect the UI elements(i.e. gauges that are binded to those properties - simple binding) and DispathcherTimer which update the properties values with some interval.

I have used the .Net Memory Profiler to determine the reason of memory increasing and found that the problem in Resources that RadGauges used - they are not releasing. There are different kind of resources, for example objects like

System.Windows.Media.Animation.Clock.RootData

System.Windows.Media.Animation.Clock.SubtreeFinalizer

System.Windows.Media.Animation.AnimationClock

and many others. In the period of 20 min with the update interval set to 1 sec I have from 4 to 2 thousand new instances of each of those types have been created and haven't been removed. And here is the place where the memory of my application is increased.

If we would check the Call Stack of each of those object types we would found very similar in each case and that would be something like this

(example of call stack for System.Windows.Media.Animation.AnimationClock)

AnimationTimeline.AllocateClock()

Clock.AllocateClock(Timeline, bool)

ClockGroup.BuildClockSubTreeFromTimeline(Timeline, bool)

Clock.BuildClockTreeFromTimeline(Timeline, bool)

Timeline.CreateClock(bool)

Storyboard.BeginCommon(DependencyObject, INameScope, HandoffBehavior, bool, long)

Storyboard.Begin(FrameworkElement, HandoffBehavior, bool)

Storyboard.Begin(FrameworkElement, HandoffBehavior)

IndicatorBase.OnValueChanged(double, double)

IndicatorBase.ValuePropertyChangedHandler(DependencyObject, DependencyPropertyChangedEventArgs)

DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs)

FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs)

DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs)

DependencyObject.UpdateEffectiveValue(EntryIndex, DependencyProperty, PropertyMetadata, EffectiveValueEntry, EffectiveValueEntry&, bool, OperationType)

DependencyObject.InvalidateProperty(DependencyProperty)

BindingExpression.Invalidate(bool)

BindingExpression.TransferValue(object, bool)

BindingExpression.ScheduleTransfer(bool)

ClrBindingWorker.NewValueAvailable(bool, bool, bool)

PropertyPathWorker.UpdateSourceValueState(int, ICollectionView, object, bool)

PropertyPathWorker.UpdateSourceValueState(int, ICollectionView)

PropertyPathWorker.OnPropertyChangedAtLevel(int)

ClrBindingWorker.OnSourcePropertyChanged(object, string)

PropertyPathWorker.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type, object, EventArgs)

WeakEventManager.DeliverEventToList(object, EventArgs, WeakEventManager.ListenerList)

PropertyChangedEventManager.OnPropertyChanged(object, PropertyChangedEventArgs)

MonitoringElement.NotifyPropertyChanged(string)

MonitoringPerformanceCounter.set_Value(float)

MonitoringPerformanceCounter.UpdateMonitoringElementIndicators()

MonitoringGroup.UpdateGroupElementsIndicators()

MonitoringGroupList.UpdateMonitoringElementsIndicatorsInAllGroups()

MonitoringServerInfoHolder.UpdateIndicators()

Dashboard.UpdaterTimer_Tick(object, EventArgs)

DispatcherTimer.FireTick(object)

So, as you can see those objects are created in response to update RadGauge's value and most probably they are created to perform smooth moving from previous value to new one.

Unfortunately, I can't attach the Profiler screen shots as I didn't found if this is possible in your forums.

So do you how can I release those unneeded resources?

Any help will be appreciated.

Thanks

Gauges

answered on 02 Apr 2009

4 answers

158 views

HeaderText update

Hello

For the localization of my application I have created a custom MarkupExtension called CaptionExtension. I'm using it to set the HeaderText in the WPF RadGridView as follows:

    
            <telerik:GridViewDataColumn IsFilterable="False" HeaderText="{local:Caption Key=memberNumberShort}" UniqueName="MemberNumber"/>

The relevant code of the CaptionExtension class looks like this:

    
                    private void LocalizationContext_CultureChanged(object sender, EventArgs e) {  
        
                        if (targetObject != null && targetProperty != null) {  
        
                            targetObject.SetValue(targetProperty, LocalizationContext.Instance.Captions[key]);  
        
                        }  
        
                    }  
        
                    public override object ProvideValue(IServiceProvider serviceProvider) {  
        
                        var targetHelper = (IProvideValueTarget)serviceProvider.GetService(typeof(IProvideValueTarget));   
        
                        targetObject = targetHelper.TargetObject as DependencyObject;   
        
                        targetProperty = targetHelper.TargetProperty as DependencyProperty;  
        
                        return LocalizationContext.Instance.Captions[key];  
        
                    }

So basically it tries to remember to which DependencyObject (targetObject variable) which DependencyProperty (targetProperty variable) was initially set. This happens in the ProvideValue()-method. Then in the LocalizationContext_CultureChanged()-event handler method, it tries to set the new value using the combination of DependencyObject/DependencyProperty combination.

For the HeaderText property the value of targetObject is of type GridViewDataColumn and the targetProperty is the HeaderText DependencyProperty. I've made sure that is really the case using the debugger.

Unfortunately the correct text is only set initially so during the call of the ProvideValue when the RadGridView is created the first time. Setting the HeaderText in the LocalizationContext_CultureChanged() does not work. There is no exception or anything, just nothing happens, the HeaderText does not change in display.

Any help is welcome.

Regards

Christian

GridView

answered on 01 Apr 2009

1 answer

241 views

Color of axis labels

Hello,

I need to change foreground color of axis value labels. I tried to set style of AxisX(Y)Label2D, but with no effect.

<

Style TargetType="{x:Type telerik:AxisXLabel2D}">

</Style>

Thanks for your reply!

Marek

Chart

answered on 30 Mar 2009

2 answers

70 views

Pre-populating gridview from dropdown selections

Hi

I have been given a task whereby the business want a Summary form which has excel like features(header freezing, column freezing, export to excel). So this component sounds a good fit. They also want the gridview populating depending on what is selected on a seperate dropdown, checked combo box and search textbox. These 3 controls control what data is displayed in the gridview. Can this be done?

GridView

answered on 30 Mar 2009

1 answer

192 views

Telerik Theme

What had happen to the telerik theme???.
The Intellisense dosnt recognize but still works... but the style ahs changed few colors.... that i dont like. how i can get back the old theme?

General Discussions

answered on 30 Mar 2009

5 answers

150 views

Filtered Records list

To be able to use the RadGridView control in our software, we need to be able to get a Filtered result list from the control. I've tried to see the where I could be able to get such a list while debugging after a gridView.ItemsControl.RecordManager.FilterDescription.PropertyChanged event, but I'm unable to find it.

Could anyone point me in the right direction?

GridView

answered on 30 Mar 2009

1 answer

124 views

Images is not displayed

Hi

I have a carousel that is filled with a list of images like this..

Dim MyListOfImages As New List(Of _Images)

MyListOfImages.Add( .....

RadCarousel1.ItemsSource = MyListOfImages

But there are no images displayed, only images with the current image path. Why is that, and how do I fix this?

Carousel

answered on 27 Mar 2009

3 answers

170 views

RadGuage - Thread Cannot be accessed

Hello,

I have successfully created the guage that I want to use a design-time in XAML. However, I have a need to create the guage at runtime. Everytime that I try to add a RadialScale to a Grid, WPF throws an Exception that says:

The calling thread cannot access this object because a different thread owns it.

What am I doing wrong? Here is my code:

// Setup the grid that the gauge will be defined in
System.Windows.Controls.Grid gaugeGrid = new System.Windows.Controls.Grid();
gaugeGrid.Height = 140;
gaugeGrid.Width = 140;
gaugeGrid.Margin = new Thickness(0, 20, 0, 0);

// Define the radial scale with the Telerik control
RadialScale radialScale = new RadialScale();
radialScale.Min = 40;
radialScale.Max = 60;
radialScale.MinorTicks = 2;
radialScale.MajorTicks = 6;

// Exception gets thrown here
gaugeGrid.Children.Add(radialScale);

Gauges

answered on 27 Mar 2009

6 answers

884 views

Sorting in treeView

hello,

I have a requirement that the treeView should get sorted according to some parameter.
Is this possible to achieve ?
A code sample would be helpful.

Thanks and regards

TreeView

answered on 27 Mar 2009