Hello

Please refer to the telerik "Save/Load the Content of the Panes" docking topic. I'm trying to load the layout of my docking control in this way when navigating away and then returning to this screen to maintain view state. This page refers to the following piece of code:

I assume that "GetPaneContent" refers to some internal method in the code-behind which returns the content, whatever that control may have been before the content was saved. Since I am using MVVM and adding RadPanes and RadPaneGroups dynamically in my view model, I maintain a dictionary of the pane contents by the serialization tag that I assign to each one. This view model code is as follows:


To explain, chartConfiguration.Id is a Guid which serves as a string tag and hostedCharts is a field of type Dictionary<Guid, ChartView>.
I use this dictionary to get the ChartView when I reload the layout. ChartView is the content I want to reset as the content of the pane.

My element loading event handler looks like this:


Here's my concern:
Firstly, if I remove the code to try to remove the ChartView from its parent, I get an InvalidOperationException saying to first disconnect the element before adding it to a new one on the line, "newPane.Content = chartView;" . It seems that the entire visual tree is still intact and reloading the screen creates new visual elements and adds these to the Docking component. Is this not memory intensive? Please note that this screen's (my screen, "ChartHostView")'s lifestyle is Transient and may be affecting the way it should work.

Secondly, my pane groups are not being loaded in the state that I saved them in. Why is it necessary for me re-set their Vertical Alignment ?

Please let me know if I am going about this the completely wrong way.
Thank you.

Hi

Can someone help me with the following please

How do I set the foreground color in GridViewCheckBoxColumn in XAML ?

I can't seem to find the appropriate property to set

thanks

Murray

I have a GridView that displays huge amounts of data. Moreover, columns are generated dynamically depending on the data and columns use custom DataTemplates. That said, GridView really takes some time to draw itself and virtualization feature is crucial for decent performace. However this feature is set to OFF once GridView height is not fixed. Obviously I want my GridView to occupy all available space and change its size when app window is resized. I.e. I want the effect equal to GridView.Height = Auto.

How can I achieve this - that GridView adjusts its size to available free space and still uses virtualization? 

Hi there

I want to arrange large number of some controls containing labels and buttons to be viewed on a window with the ability of resizing.

Is there any feature to implement what Google did in his image search?
In normal state, the control only shows some picture or labels,
but in mouse-over state it must be zoomed-up and all the contained controls like buttons, gauges, and more...

Thanks

Hi,

I'm trying to programmatically assign a header template for a column. The header template is similar to the GridViewSelectColumn as it just would have a checkbox in it, but I need the column to be able to bind to a property. I did look at the blog post from Vlad, but it will not work for this particular situation.

Below is the code I have to create a custom template (which works with for an ordinary ListView), but I don't know how to programmatically assign it to the column. I tried setting it to the column.Header property since it's of type object, but that did not work.

FrameworkElementFactory factory = new FrameworkElementFactory(typeof(CheckBox));

factory.AddHandler(CheckBox.CheckedEvent, new RoutedEventHandler(GridViewAll_HeaderCheckBox_Checked));

factory.AddHandler(CheckBox.UncheckedEvent, new RoutedEventHandler(GridViewAll_HeaderCheckBox_Checked));

factory.SetValue(CheckBox.ToolTipProperty, "(De)Select All");

 

DataTemplate template = new DataTemplate();

template.DataType = typeof(bool);

template.VisualTree = factory;



GridViewCheckBoxColumn column = new GridViewCheckBoxColumn();

column.DataMemberBinding = new Binding(prefix + property.Name);

column.Header = template // <-- this does not work


Thank you,
Tim

I have a GridView that is bound to a QueryableCollectionView. The QueryableCollectionView is constructed from an ObservableCollection, which is populated in code.  (So there's no messing about with LINQ to SQL ORMS, etc.)

I have a command implemented in the ViewModel (bound to a button and to a function key, but that's not important), that needs to check to see if any of the records contained in the grid have certain values in a certain field.

I'd thought I'd be able to do a simple LINQ query on the QueryableCollectionView, but it doesn't seem to work. Even the simplest won't compile.

This:


Results in: Instance argument: cannot convert from 'Telerik.Windows.Data.QueryableCollectionView' to 'System.Linq.IQueryable'

This:


Results in: Cannot convert lambda expression to type 'Telerik.Windows.Data.SelectDescriptorCollection' because it is not a delegate type.

The only workaround I've been able to find is to iterate through all the records with a foreach(), which results in considerably less clear code.

I've created a CustomGridViewToggleRowDetailsColumn class that descends from GridViewBoundColumnBase.  Its purpose is to display the row details toggle control only if the row in question contains data to be displayed in the row details.

In order to speed up the retrieval of data from my database, I have added a boolean flag to the view model object that is displayed in the RadGridView that indicates whether the object has data for the row details.  This flag is set when the row is retrieved from the database.  However, I do not want to retrieve the data for the row details at the same time.  Rather, I want to wait for the user to click on the button to expand the details and go get the data at that time.  The underlying View Model objects implement INotifyPropertyChanged, so the WPF controls get notification of changes.

The CustomGridViewToggleRowDetailsColumn class has a Click event that I want to program.  When the user clicks on the button, I want the code to check to see if the detail data has been retrieved from the database yet, and if not, to go and get it.

Here's the definition of the CustomGridViewToggleRowDetailsColumn class:


Here is the Click event handler that I wrote that is called when the user clicks on the toggle button for a row that has details to be displayed:


The problem is that the parameters to the ExpandAlarms_Click method always refer to the same row, no matter which row I click on.  I think there is something wrong, either in the ToggleButton_Click method or in the CreateCellElement method.  But I don't know what the issue could be.  I think I need to save the Cell passed to the CreateCellElement somewhere other than were I'm saving it now, but I'm not sure where that would be.

Please help

Tony

Hello,

I have the following column defined in my xaml code

<telerik:GridViewMaskedTextBoxColumn Mask="P1" MaskType="Numeric" 
DataMemberBinding="{Binding CurrentAllocationWeight}" 
DisplayIndex="1" IsReadOnly="True" DataFormatString="{}{0:P1}"  
Header="% Of Total" ColumnGroupName="CurrentAllocation"/> 

The bound property is a null-able decimal value. I have no other validation in the code-behind. When I try to enter a value in the cell, I get a validation error: "DecimalConverter cannot convert from System.Double".

How should I fix this, so that the user can enter say, 5.5, and it would display that value as "5.5%" in the cell?

Hasanain

Hi all,

I have two grids. Grid A has data where some of the columns have drop downs. Grid B is used to administrate the lists in the those drop downs.

When a change occurs in Grid B then the values in Grid A are updated using INotifyPropertyChanged. However, I also want validation to kick in (Its possible to delete values from Grid B but Grid A needs to have appropriate values)

For basic cell level validation I have used the cell validating event and that works pretty well. If possible, when Grid B has been updated I would want cell validation to start.

Thanks in advance

Arthur

Hi.

I'd like to be able to add more manipulation points to a RadDiagramConnection programmatically. Is this possible and how would I go about doing it?

Regards.