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Nils
300
Setting Label Style in Code
posted

Hello,

I need a little assistance. I created a Style as DynamicResource which I am loading in a private variable at startup:

Normal 0 21 false false false DE X-NONE X-NONE <Style x:Key="LabelPresenterStyleFiltered" TargetType="{x:Type igDP:LabelPresenter}" >

               <Setter Property="Background">

                               <Setter.Value>

                                               <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">

                                                               <LinearGradientBrush.GradientStops>

                                                                              <GradientStopCollection>

                                                                                              <GradientStop Offset="0" Color="#FFfffadc"/>

                                                                                              <GradientStop Offset="1" Color="#FFffda5b"/>

                                                                              </GradientStopCollection>

                                                               </LinearGradientBrush.GradientStops>

                                               </LinearGradientBrush>

                               </Setter.Value>

                </Setter>

</Style>

 

This style should be set at labels with a activated filter. I try to accomplish this through using the RecordFilterChanged event:

 private void EvaluationList_RecordFilterChanged(object sender, Infragistics.Windows.DataPresenter.Events.RecordFilterChangedEventArgs e)
        {
            RecordFilter updatedRecordFilter = e.RecordFilter;
            if (updatedRecordFilter.Conditions.Count == 0)
            {
                updatedRecordFilter.Field.Settings.LabelPresenterStyle = null;
            }

            StringBuilder sb = new StringBuilder(2000);
            sb.Append(ResourcesManager.GetResource("Evaluation"));
            RecordFilterCollection recordFilters = this.EvaluationListUI.EvaluationList.FieldLayouts[0].RecordFilters;
            Boolean isFiltered = false;
            if (recordFilters.Count > 0)
            {
               
                sb.Append(ResourcesManager.GetResource("EvaluationMskFiltered"));
                foreach (RecordFilter recordFilter in this.EvaluationListUI.EvaluationList.FieldLayouts[0].RecordFilters)
                {
                    if (recordFilter.Conditions.Count > 0)
                    {                       
                        sb.Append(recordFilter.Field.Label).Append(",");
                        isFiltered = true;
                       
                        recordFilter.Field.Settings.LabelPresenterStyle = this.ActiveFilterLabelStyle;
                       
                    }
                    else
                    {
                        recordFilter.Field.Settings.LabelPresenterStyle = null;
                    }
                }
                sb.Remove(sb.Length - 1, 1);
                sb.Append(" )");
            }

            if (isFiltered)
            {
                this.EvaluationListUI.Label = sb.ToString();
            }
            else
            {
                this.EvaluationListUI.Label = ResourcesManager.GetResource("Evaluation");
            }
        }

 

The style does not show up :-(

Parents
  • 69686
    posted

    Hello,
    This is because the element has to be reinitialized. However, you can go with a different approach and avoid this. You can create an attached property on the MainWindow and bind to this. I am attaching a sample project demonstrating this approach.  Here are some code snippets from the sample :

    1. create attached property of the main window :

            public static bool GetIsFiltered(DependencyObject obj)

            {

                return (bool)obj.GetValue(IsFilteredProperty);

            }

     

            public static void SetIsFiltered(DependencyObject obj, bool value)

            {

                obj.SetValue(IsFilteredProperty, value);

            }

            public static readonly DependencyProperty IsFilteredProperty =

                DependencyProperty.RegisterAttached("IsFiltered", typeof(bool), typeof(MainWindow), new UIPropertyMetadata((bool)false));

    2. Set it to the Field appropriately :

    private void xamDataGrid1_RecordFilterChanged(object sender, RecordFilterChangedEventArgs e)

            {

                if (e.RecordFilter.Conditions.Count > 0)

                {

                    e.RecordFilter.Field.SetValue(IsFilteredProperty, true);

                }

                else

                {

                    e.RecordFilter.Field.SetValue(IsFilteredProperty, false);

                }

            }

    3. Apply a style that binds to this property :

    <Style TargetType="{x:Type igDP:LabelPresenter}">

                <Style.Triggers>

                    <DataTrigger Binding="{Binding Path=(Field).(local:MainWindow.IsFiltered), RelativeSource={RelativeSource Self}}" Value="True">

                        <Setter Property="Background" Value="Red" />

                    </DataTrigger>

                </Style.Triggers>

            </Style>

    WpfApplication13.zip
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