Questions on UI for WPF Forum

1 answer

132 views

Can't select first record in GridView using QueryableCollectionView

you can get such behaviour, doing following steps:
1. create QueryableCollectionView and filling it any data. Collection have to contain more than one record.
2. Bind this QueryableCollectionView to GridView.
3. Call MoveCurrentToPosition(0) for QueryableCollectionView.

Item in GridView will not be selected, if CurrentPosition for QueryableCollectionView was 0 or -1. But, I think, first record has to be selected.

How can I solve this problem?

GridView

answered on 14 May 2012

1 answer

152 views

Error in the filter

Good time of day.
I need to get the GridView and filter the filter to print.
why in the debug properties I see:
http://i49.tinypic.com/20nozt.jpg

Telerik.Windows.Controls.GridView.DistinctValuesFilterDescriptor DistinctFilter;

Telerik.Windows.Controls.GridView.MemberColumnFilterDescriptor filter;

Telerik.Windows.Controls.GridView.FieldFilterDescriptor FieldFilter;

And in the name space they are not.
Why not?

public Telerik.Windows.Controls.GridView.DistinctValuesFilterDescriptor DistinctFilter;// Does not type in namespace

public Telerik.Windows.Controls.GridView.MemberColumnFilterDescriptor filter;// Does not type in namespace

public Telerik.Windows.Controls.GridView.FieldFilterDescriptor FieldFilter;// Does not type in namespace

public Telerik.Windows.Data.FilterOperator x ;

public Telerik.Windows.Data.FilterCompositionLogicalOperator x ;

And those listings there, but the content is missing.

How do I read a different filter GridView? What should I do?

GridView

answered on 14 May 2012

3 answers

177 views

Prevent automatic check/uncheck on disabled TreeViewItems

Hi,

I'm using a RadTreeView control and have got the check list feature to work for me nicely, but am having problems with items in the tree that are disabled.

The tree is dynamically created and uses certain conditions to make some nodes disabled, and set to checked. The tree view is working against a collection of items and if an item from the tree is in that collection, then users should not be able to click on it, or change it's checked status.

the disabled part works perfectly, but when a parent node is clicked, it automatically changes the checked value on all child nodes, including the disabled ones.

is there any way to stop this from happening?

thanks,
nemanja

TreeView

answered on 14 May 2012

3 answers

140 views

Export RadGridView objects to Excel tabs

Hello,

I have an application with several gridviews on separate tabs. I would like to be able to export the contents of the grids to Excel in a way that each grid goes to a separate tab of the Excel file. Is there a straightforward way to do this?

Also, I need to add other rows of data to the spreadsheet that are not coming from the gridviews. Can this be done?

GridView

answered on 14 May 2012

1 answer

114 views

Potential System.InvalidOperationException in DataFormDataField.SetLabelStyle()

Hello,

Found a potential bug in the private DataFormDataField.SetLabelStyle() method. Basically, a user of the DataForm control can cause an exception of their lable content is not the same type as that specified in the LabelStyle's TargetType. As a fix, we can just check the types and apply if the are compatible. Here is how to fix the bug:

1) In the 'Telerik.Windows.Controls.DataFormDataField' class, you will see the SetLabelStyle method defined as:

private void SetLabelStyle() {

FrameworkElement label = this.GetTemplateChild("PART_Label") as FrameworkElement;

if (label != null &&

this.ParentForm != null &&

this.ParentForm.LabelStyle != null) {

label.Style = this.ParentForm.LabelStyle;

}

Replace this method with:

private void SetLabelStyle() {

FrameworkElement label = this.GetTemplateChild("PART_Label") as FrameworkElement;

if (label != null &&

this.ParentForm != null &&

this.ParentForm.LabelStyle != null &&

this.ParentForm.LabelStyle.TargetType.IsCompatibleWith(label.GetType())) {

label.Style = this.ParentForm.LabelStyle;

}

Please use this fix until Telerik gets around to correcting the bug.

- Rashad Rivera, Omegus Prime, LLC

DataForm

answered on 14 May 2012

10 answers

227 views

PropertyGrid does not support inheritance

Below are some class definitions. My property grid is named pg

pg.Item = new Parent { Child = new ConcreteChild() };

The property grid will show the Child Property, the displayname attribute is ignored and only properties of the ancestor class are shown. If I trap the AutoGeneratingPropertyDefinition event the PropertyType shows as AbstractChild. It appears the propertygrid is not looking at the instance type of the property.

If I bind directly to an instance of type ConcreteChild, I get all the properties.

pg.Item = new ConcreteChild(); //this works

public class Parent
{
public AbstractChild Child { get; set; }
}
public abstract class AbstractChild
{
public string Name { get; set; }
}

[DisplayName("Concrete Child")]
public class ConcreteChild : AbstractChild
{
[DisplayName("New Property")]
public String NewProperty { get; set; }
}

PropertyGrid

answered on 14 May 2012

2 answers

297 views

[Solved] StringFormat not formatting on new Items

I have a radCarousel bound to an ObservableCollection. On the carousel item I have label with:

<Label FontSize="18" Padding="0" Content="{Binding Effective_Date, StringFormat=d}" />

When I set the ItemSource to the ObservableCollection the Date is formatted correctly. However when I add an Item to the collection manually the date on the new Item is not formatted. It displays the full datetime string instead of just the date. How can I fix this?

Carousel

answered on 11 May 2012

1 answer

619 views

Expand All extremely slow - how to show busy?

Hello,

I have a fairly simple tree, but it may contain thousands of items in 5 or 6 levels of depth. The data collection is bound in MVVM and exists in the view model. I created a context menu on right click that allows the user to Expand All for a single node, which could potentially open hundreds of child nodes. When the expand command is executed, the collection is traversed and elements are changed to IsExpanded = true.

What I notice is that my view model command executes very quickly, but then the actual tree control spends quite a long time initializing the items and displaying the levels (can be 30 seconds or longer). I guess I can live with the long wait, but how do I present and clear a busy indicator when control is lost to the Telerik threads? Trying to set the busy indicator around the view model command only lasts for a second.

Are there other options for a faster or more visual response from the tree control?

The tree:

<HierarchicalDataTemplate x:Key="TreeObjectTemplate" ItemContainerStyle="{StaticResource containerStyle}" ItemsSource="{Binding ChildNodes}">

<StackPanel Orientation="Horizontal">

<TextBlock Text="{Binding DisplayName}" />

</StackPanel>

</HierarchicalDataTemplate>

<telerik:RadTreeView Grid.Row="0" x:Name="tvTree" ItemTemplate="{StaticResource TreeObjectTemplate}"

Margin="0,8,0,4" VerticalAlignment="Top" Padding="0,2,0,10"

IsSingleExpandPath="False" IsLineEnabled="True" ExpanderStyle="{DynamicResource ExpanderStyle}"

SelectionMode="Single" IsEditable="False" IsDragDropEnabled="False" ItemContainerStyle="{StaticResource containerStyle}"

ItemsSource="{Binding tvTreeData}"

SelectedItem="{Binding tvSelectedItem, Mode=TwoWay}"

MouseRightButtonDown="treeView_MouseRightButtonDown">

<telerik:RadContextMenu.ContextMenu>

<telerik:RadContextMenu>

<telerik:RadMenuItem Header="Expand All Levels" Command="{Binding ExpandCommand}"/>

<telerik:RadMenuItem Header="Collapse All Levels" Command="{Binding CollapseCommand}"/>

</telerik:RadContextMenu>

</telerik:RadContextMenu.ContextMenu>

<i:Interaction.Triggers>

<i:EventTrigger EventName="PreviewUnselected">

<Command:EventToCommand Command="{Binding Path=PreviewUnselectedCommand, Mode=OneWay}" PassEventArgsToCommand="True"/>

</i:EventTrigger>

<i:EventTrigger EventName="PreviewSelected">

<Command:EventToCommand Command="{Binding Path=PreviewSelectedCommand, Mode=OneWay}" PassEventArgsToCommand="True"/>

</i:EventTrigger>

</i:Interaction.Triggers>

</telerik:RadTreeView>

Expand Command:

private void ExpandAllChildren(MyTreeNode node, bool bExpandOrCollapse)

{

foreach (MyTreeNode childNode in node.ChildNodes)

{

ExpandAllChildren(childNode, bExpandOrCollapse);

}

if (node.ChildNodes.Count > 0)

node.IsExpanded = bExpandOrCollapse;

}

private RelayCommand _expandCommand;

public ICommand ExpandCommand

{

get

{

if (_expandCommand == null)

{

_expandCommand = new RelayCommand(() =>

{

try

{

UICursor = Cursors.Wait;

ExpandAllChildren(tvSelectedItem, true);

}

catch

{

}

finally

{

UICursor = Cursors.Arrow;

}

});

}

return _expandCommand;

}

Thanks for any help. Bob C.

TreeView

answered on 11 May 2012

5 answers

98 views

Is it possible to change the position of x and y offset of a character inside a radrichtextbox

i want to create manual spacing and overlapping of characters is this possible?

i have seen inside some application that the user can change the position of the character with sliders
one for x-axis and one for y-axis.

is this possible ?and how

RichTextBox

answered on 11 May 2012

1 answer

91 views

Display data on TimeBar dissappear

I have data bound to the ItemSource on a RadColumnSparkline within a RadTimeBar which displays fine on a usercontrol. However, the issue comes in with new visual rendering where the property on the viewmodel is set (for the ItemSource on the RadColumnSparkline) before the usercontrol is loaded. The binding between the viewmodel and view should be working on both scenarios?

TimeBar

answered on 11 May 2012