Questions on UI for WPF Forum

7 answers

137 views

I am using RadDocking along with Prism. I found the sample provided by Telerik on the subject and i am using it as well.

My problem is that i want to destroy the Region when a RadPane is closed. Which is something the sample is not doing.

So, it brings us to this:

    
            protected override void Adapt(IRegion region, RadPaneGroup regionTarget)

At this stage, i would like to be able to get a reference to the RadDocking, to subscribe the Close event, and then do the destroy Region stuff.

But i can't figure out how to get the RadDocking from a RadPaneGroup. I tried several FindParent function, but none seems to be able to travel up the VisualTree to the RadDocking.

I am using the latest internal build.

Thank you for any help.

Docking

answered on 05 Jul 2010

6 answers

302 views

Getting Property values for GridViewHeaderCell from a Theme

I'm having trouble trying to obtain/apply a default property value from a theme. Certain actions in my application change the GridViewHeaderCell's foreground property to a color different than that of the theme. After it changes, I cannot figure out an easy way to change the color back to the theme's normal color.

Here is how I set the style to change the Header cells' color.

                    foreach(Telerik.Windows.Controls.GridViewColumn column in GridView.Columns)         
            {         
               Style s = new Style(typeof(GridViewHeaderCell), column.HeaderCellStyle);         
               s.Setters.Add(new Setter(GridViewHeaderCell.ForegroundProperty, new SolidColorBrush(Colors.Red)));         
               s.Seal();         
               column.HeaderCellStyle = s;         
            }         

To Change it back to the default, I've tried the following

                    column.ClearValue(GridViewHeaderCell.ForegroundProperty); //no noticeable impact 
            
            column.ClearValue(GridViewColumn.HeadCellStyleProperty);  //no noticeable impact         
            
            //this makes the foreground (some text) disappear altogether         
            Style s = new Style(typeof(GridViewHeaderCell), column.HeaderCellStyle);         
            s.Setters.Add(new Setter(GridViewHeaderCell.ForegroundProperty, null));         
            s.Seal();         
            column.HeaderCellStyle = s;

None of those three ways seem to do the trick. I tried clearing the value with the hope that the Theme's default header cell foreground property would take place once the local value is removed, but it doesn't seem to do anything.

I have also tried getting and storing the default value before I change it (via GridViewHeaderCell.ForegroundProperty.GetMetadata(typeof(GridViewHeaderCell))...) but the PropertyMetaData object returned always indicates that the default Foreground for GridViewHeaderCell is a black brush, even when using themes like Office Black or Vista, which clearly do not use a black brush in their foregrounds.

Has anyone dealt with this before, or know where I'm going wrong? If anyone can help me figure out the right way to do it, I will be most grateful.

Thanks,
Tom

GridView

answered on 05 Jul 2010

1 answer

185 views

FilterDescriptor

Hi,

I'm trying to programmatically set a FilterDescriptor to default filter out a number of rows in a dataset/datatable based on

a Boolean property/column that I retrieve from my database/viewmodel. The problem is that I keep getting conversion error:

'The binary operator Equal is not defined for the types 'System.Object' and 'System.Boolean.'.

paramView.FilterDescriptors.Add(new FilterDescriptor("Show",FilterOperator.IsEqualTo,true));

I've confirmed that the datatype from the database is a System.Data.DbType.Boolean (shows up in the grid as a checkbox column by default). Am I wrong in assuming that there should be a way of expressing 'true' that meets the requirement of the FilterExpression-generator, or is there another recommended way of accomplishing this task?

Best regards,

Finn

GridView

answered on 05 Jul 2010

1 answer

82 views

Row animation on filtering

Hi,

I'm looking for a way to add animation when a row is removed due to filtering.

I have a grid, with a column containing a checkbox for each row.

The filter is "false" - when the checking the checkbox, the row will be removed.

I've tried to subscribe to RowUnloaded event, and do the animation, but the row is removed immediately and the animation is not displayed...

Is there an event I could subscribe to before the row is unloaded, or is there another approach to solve this issue?

Thanks,

Liat.

GridView

answered on 05 Jul 2010

1 answer

111 views

Single row

Hi

How can I get single row in the grid and Influence it?

For sample some rows I need to make read only or invisibility

or maybe different style for selected rows?

Best regards

Ehud

GridView

answered on 05 Jul 2010

1 answer

53 views

Chart needs ItemWidthPercent set before draw?

ChartArea.ItemWidthPercent is a DependencyProperty within a RadChart, but setting it after a chart is drawn has no visible effect, only if it is set to the desired value before the RadChart is drawn. I've tried setting it in bindings, as well as setting it manually with code-behind driven by WPF events to no avail. Is this intended behavior? Am I missing something that must be done (will post code if needed)? Or is it simply that once the chart has been rendered, it must be re-rendered to take into effect some changes?

Chart

answered on 05 Jul 2010

1 answer

71 views

Selecting Bars

Hi,

I have a radchart with a Canvas overlay. In the canvas I allow my users to create a rectangle to enclose the bars/data points that he may be interested. The Canvas is 1:1 size with the radChart.

Now based on the rectangle coordinates... How do I find which bars the user selected on the bars underneath my layer? Is there a way I can pass screen/canvas coordinates to the radchart and get back a collection with the items inside the range?

Something like:

selectedCollection = radChart.getItems(Point p1, Point p2);

J

Chart

answered on 05 Jul 2010

2 answers

1.2K+ views

ItemsSource Binding to a Single Object

Hi, hopefully this will be a simple question with a quick answer.

My logical data structure is a List (eg. List<TopList>) with each item in the first list also having it's own list (eg. TopList[0].MiddleList). Finally, each MiddleList has some other class (eg. TopList[0].MiddleList[0].BottomClass), and I want to display all three in the UI with a RadTreeView for expanding and drag and drop support.

My xaml is set up as:

    
                    <HierarchicalDataTemplate x:Key="GroupListNestedContentTemplate"> 
        
                        <bui:UserControlForBottomClass/> 
        
                    </HierarchicalDataTemplate> 
        
                    <HierarchicalDataTemplate x:Key="GroupListNestedTemplate" ItemsSource="{Binding BottomClass}" ItemTemplate="{StaticResource GroupListNestedContentTemplate}"> 
        
                        <bui:UserControlForMiddleLevel /> 
        
                    </HierarchicalDataTemplate> 
        
                    <HierarchicalDataTemplate x:Key="GroupListTemplate" ItemsSource="{Binding MiddleList}" ItemTemplate="{StaticResource GroupListNestedTemplate}"> 
        
                        <bui:UserControlForTopLevel/> 
        
                    </HierarchicalDataTemplate> 
        
            <Controls:RadTreeView x:Name="UiElement" DataContext="{Binding}" ItemsSource="{Binding}" ItemTemplate="{StaticResource GroupListTemplate}" IsDragDropEnabled="True" IsSingleExpandPath="True" IsExpandOnSingleClickEnabled="True" />

With codebehind setting UiElement.DataContext = TopList.

The problem is that (from all the examples I've seen) the RadTree requires my BottomClass to be in a List. Changing my BottomClass into a List will render and databind correctly. Ideally though, I don't want to do this to my logic and create a List with only one item. My question is basically: Is there a way to DataBind and display my BottomClass without putting it into a List and without using a for loop in the code behind?

As a side note I've considered turning my UI structure into a RadTree with Expanders as the contents, but this ran into display and usability issues when collapsing the expander vs closing the tree nodes.

TreeView

answered on 05 Jul 2010

1 answer

89 views

Rows Numbers

Hi

Is there property for the rows number (IsRowsNumbersEnable) or I need to build it myself like in the Sample?

Best regards

Ehud

GridView

answered on 04 Jul 2010

0 answers

91 views

Bring SelectedDate into view

Hello,

I have a RadCalendar and I'm binding the SelectedDate property. It's working fine - the source and the target get updated as normal. However, I want to bring the selected date into view when it doesn't belong to the month being displayed.

Edit: I solved my problem using DisplayDate.

Calendar

asked on 02 Jul 2010