Questions on UI for WPF Forum

3 answers

392 views

So I have two gridsplitters in my app and I want to persist wherever the user drags them across sessions. This mostly works but sometimes I seem to get this error whilst I am moving a gridsplitter and it locks and crashes the app:

An infinite loop appears to have resulted from repeatedly invalidating the TimeManager during the Layout/Render process

I don't know if this is a wild goose chase with the gridsplitters, but whenever I go back into the app, the gridsplitter positions revert back to their default positions and I haven't noticed it happen with any of the other controls that use the persistence framework.

So on my usercontrol with both gridsplitters I have the following code :

ServiceProvider.RegisterPersistenceProvider<ICustomPropertyProvider>(typeof(RadGridView), new GridViewCustomPropertyProvider());

SplitterCustomPropertyProvider splitterPropProvider = new SplitterCustomPropertyProvider();

ServiceProvider.RegisterPersistenceProvider<ICustomPropertyProvider>(typeof(RowDefinition), splitterPropProvider);

ServiceProvider.RegisterPersistenceProvider<ICustomPropertyProvider>(typeof(ColumnDefinition), splitterPropProvider);

SplitterCustomPropertyProvider is as so:

public class SplitterCustomPropertyProvider : ICustomPropertyProvider

{

public CustomPropertyInfo[] GetCustomProperties()

{

// Create custom property to persist the pixels property on a column/row definition

return new CustomPropertyInfo[]

{

new CustomPropertyInfo("GridSplitterPixels", typeof(double)),

};

}

public void InitializeObject(object context)

{

}

public object InitializeValue(CustomPropertyInfo customPropertyInfo, object context)

{

return null;

}

public object ProvideValue(CustomPropertyInfo customPropertyInfo, object context)

{

GridSplitterProxy proxy = new GridSplitterProxy();

if (context is RowDefinition)

{

RowDefinition row = context as RowDefinition;

proxy.Pixels = row.ActualHeight;

return proxy;

}

else if (context is ColumnDefinition)

{

ColumnDefinition row = context as ColumnDefinition;

proxy.Pixels = row.ActualWidth;

return proxy;

}

return null;

}

public void RestoreValue(CustomPropertyInfo customPropertyInfo, object context, object value)

{

GridSplitterProxy proxy = value as GridSplitterProxy;

if (context is RowDefinition)

{

RowDefinition row = context as RowDefinition;

if (proxy.Pixels == 0)

row.Height = new GridLength(1, GridUnitType.Auto);

else

row.Height = new GridLength(proxy.Pixels);

}

else if (context is ColumnDefinition)

{

ColumnDefinition col = context as ColumnDefinition;

if (proxy.Pixels == 0)

col.Width = new GridLength(1, GridUnitType.Auto);

else

col.Width = new GridLength(proxy.Pixels);

}

private class GridSplitterProxy

{

public double Pixels { get; set; }

}

The loading of the gridsplitter positions is done on the UserControl_Loaded event :

IsolatedStorageProvider isoStorageProvider = new IsolatedStorageProvider();

isoStorageProvider.LoadFromStorage();

And the saving of the positions is done on the MainWindow_Closing event :

IsolatedStorageProvider isoStorageProvider = new IsolatedStorageProvider();

isoStorageProvider.SaveToStorage();

Any ideas as to why I'm getting this error?

PersistenceFramework

answered on 25 Apr 2017

2 answers

159 views

Tree not expanded in new filter after collapsing it during previous filter

We use the following code to put a filter on tree items which work great intially.

snip .....

TreeListView.FilterDescriptors.SuspendNotifications();
ClearFilters();

ApplyFilter(Reflector.GetProperty<ProjectReleaseLineViewModel>((line) => line.HasError).Name, true, FilterOperator.IsEqualTo);

snip ......

private void ClearFilters()
{
           foreach (var column in TreeListView.Columns.OfType<Telerik.Windows.Controls.GridViewBoundColumnBase>())
           {
                var filterControl = column.FilteringControl as ColumnFilterControl;
if (filterControl != null)
{
filterControl.Reset(column);
}
}
}

private void ApplyFilter(string member, object value, FilterOperator @operator = FilterOperator.IsEqualTo)
{
var filter = new CompositeFilterDescriptor();
filter.FilterDescriptors.Add(new FilterDescriptor(member, @operator, value));
var colum = TreeListView.Columns.OfType<GridViewBoundColumnBase>().Skip(2).First();
colum.DataControl.FilterDescriptors.Add(filter);
}

When performing this action the tree explands showing the lines which have errors.

The strange behaviour happens after that through the following actions.

- The use manually collapses the expanded items al the way to level zero

- Then the filter is cleared through the following code

TreeView

answered on 25 Apr 2017

1 answer

681 views

How to implement Telerik checkbox in WPF to trigger functions while still storing original state?

How to implement Telerik checkbox in WPF to trigger functions while still remembering original state?

I have a checkbox that when checked should exclude an item in a RadGridView while still remembering the state (of the item being included), so if (or when) a user unchecks the checkbox, the item is included back in the list within the RadGridView. Essentially setting the original data back when unchecked to revert back to original data.

GridView

answered on 24 Apr 2017

1 answer

275 views

Need help on ConditionalDataTemplateSelector

Hi!

When I create a ConditionalDataTemplateSelector to use as CellTemplateSelector in a GridView, I have to specify the name of the field in my DataTemplateRule like this:

<telerik:ConditionalDataTemplateSelector x:Key="PriceSelectedSelector">

<telerik:DataTemplateRule Condition="IsSelected = False OR IsSelected = null" Template="t1" />

<telerik:DataTemplateRule Condition="IsSelected = True" Template="t2" />

</telerik:ConditionalDataTemplateSelector>

But if I have a lot of columns that are just true/false I have to create a new ConditionalTemplateSelector for each and every column. Is there a way to build this in a more general way like "If the value in this cell is true, take template t1" so I could use my ConditionalTemplateSelector on different columns regardless of the name of the field?

Regards
Heiko

GridView

answered on 24 Apr 2017

1 answer

143 views

TileList virtualization

Dear Telerik Team,

I've been playing with TileList for a while and it seems like the items virtualization does not work despite it is using an items panel that *should* allow virtualization. the documentation does not state whether TileList does support virtualization (it does for few other controls).

Cheers, Greg

TileList

answered on 24 Apr 2017

1 answer

150 views

RadDataForm CommandProvider

Hello. I use RadDataForm component in my DataTemplate and create custom DataFormCommandProvider for it, but it doesn't work.

DataForm

answered on 21 Apr 2017

8 answers

380 views

[Solved] Grid loses display on TabControl

I have a grid which displays a listing of records on a TabControl. A second tab displays the detail for the selected record on the grid. This all works fine except when I go back to the grid list tab, the grid is blank. The data is there because if I click a different record and move to the detail tab it displays that corresponding data. Also, if I page down and then back up the grid will redisplay the data correctly. So it's definitely just a display issue. Any ideas?

Thanks,
-Sid Meyers.

GridView

answered on 21 Apr 2017

8 answers

606 views

IsHidden Problem in RadPane with binding

Hi There,

I have a problem with RadPanes isHidden property, i want to set IsHidden by using a binding, but when i do this it is not working, but if i set the IsHidden="True" at XAML then its working properly, can you please guide me in this case ?

Thanks in advance,
Srinivas.

Docking

answered on 21 Apr 2017

2 answers

711 views

Popup is opening to outside window in SplitButton

Hi Team,

I have used the RadSplitButton to show the drop down along with button. But the drop down popup is opened outside window, please share any idea to load the popup only within window. Please refer the below code

<telerik:RadSplitButton Margin="20,152,0,0"

Foreground="#8F8F8F"

HorizontalAlignment="Left"

VerticalAlignment="Top"

Content="DROP DOWN">

<telerik:RadSplitButton.DropDownContent>

<StackPanel Orientation="Vertical">

<telerik:RadListBox ItemsSource="{Binding AddressBooks}"

BorderThickness="0">

<telerik:RadListBoxItem>AAA AAA AAA AAA</telerik:RadListBoxItem>

<telerik:RadListBoxItem>BBB BBB BBB BBB</telerik:RadListBoxItem>

<telerik:RadListBoxItem>CCC CCC CCC CCCC CCC</telerik:RadListBoxItem>

</telerik:RadListBox>

<Button Content="ADD NEW"

BorderThickness="0,1,0,0"/>

</StackPanel>

</telerik:RadSplitButton.DropDownContent>

</telerik:RadSplitButton>

Please refer the attached image to know more about the issue. And I am using Windows 8.1 OS.

Regards,

Antony Raj

Buttons

answered on 21 Apr 2017

2 answers

301 views

DataFormDataField Multiline Comments Box w/ Wrap and Accept Return

Hi. Im trying to create a DataFormDataField for comments. The requirements are that the textbox needs to accept return, wrap and always show 3 lines no matter the ammount of text.

my first attempt i came up with the following

                                <telerik:DataFormDataField x:Name="Comm"
                                                           Label="Comments"
                                                           LabelPosition="Above"
                                                           Width="355"
                                                           Canvas.Left="10"
                                                           Canvas.Top="61">
                                    <TextBox Height="50"
                                             AcceptsReturn="True"
                                             TextWrapping="Wrap"
                                             Text="{Binding BIGCOMMENTS, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                             IsReadOnly="{Binding IsReadOnly, ElementName=Comm, Mode=OneWay}"
                                             VerticalContentAlignment="Top"
                                             TabIndex="18" />
                                </telerik:DataFormDataField>

works nice until you need to resize, it gets a bit wonky. second attempt was to modify the template in blend.

I basically replaced the content presenter (which was showing a text box) with an acutal textbox. this works much better in terms of resizing, however i lose functionality for 'DataMemberBinding', which i need.

Any ideas to an ideal solution?

DataForm

answered on 20 Apr 2017