Questions on UI for WPF Forum

5 answers

291 views

Our team has been using Telerik WPF controls for the last 12 months and were very surprised to learn that the RadTreeView auto scroll feature was removed within the last year (that's our understanding). We did end up using the the AutoScrollBehavior class attached to various threads on the subject but found a very strange drag and drop bug that was introduced with this behavior.

Our suspicion is that this feature may have been removed because it was, for lack of a better description, buggy. Does anybody know why this was removed? Are there any plans to add it back? FYI, the bug that we found is that in certain situations, dragging items with this behavior causes the DraggedItems collection found in the RadTreeViewDragEventArgs object to contain the same object twice. And when this happens, the visual cue also contains two visual objects. If it were just a visual issue we might ignore it but it actually can lead to unhandled exceptions somewhere in the bowels of the RadTreeView.

Does anybody have any further info on this?

TreeView

answered on 01 Mar 2013

1 answer

396 views

Timeline like video editor

Is it possible to make the timeline control act like a video/audio editor, where you see multiple tracks horizontally and the timeline is the length of media. You can put media back to back on one particular track. Something like this?

http://library.creativecow.net/articles/griffin_nick/media100_producer/VIDEO_TRACKS.jpg

TimeLine

answered on 01 Mar 2013

4 answers

536 views

Changing background color of GridViewCheckBoxColumn

Hi,

I am working on a RadGridView with a GridViewCheckBoxColumn using the Expression_DarkTheme. I'm trying to modify the colors, which is working well for most of the colors. But i have some problems with the background of the checkbox.
In edit mode i can modify the color by setting the BulletDecoratot.Bullet background color

<Setter Property="Template">

<Setter.Value>

<ControlTemplate TargetType="{x:Type CheckBox}">

<BulletDecorator Background="Transparent" SnapsToDevicePixels="true">

<BulletDecorator.Bullet>

<Border x:Name="Border"

Width="13"

Height="13"

CornerRadius="0"

Background="White"

BorderThickness="1"

BorderBrush="#404040">

<Path

Width="7" Height="7"

x:Name="CheckMark"

SnapsToDevicePixels="False"

Stroke="#404040"

StrokeThickness="2"

Data="M 0 0 L 7 7 M 0 7 L 7 0" />

</Border>

</BulletDecorator.Bullet>

</BulletDecorator>

<ControlTemplate.Triggers>

<Trigger Property="HasContent" Value="true">

<Setter Property="FocusVisualStyle" Value="{StaticResource CheckRadioFocusVisual}"/>

<Setter Property="Padding" Value="4,0,0,0"/>

</Trigger>

<Trigger Property="IsEnabled" Value="false">

<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>

</Trigger>

</ControlTemplate.Triggers>

</ControlTemplate>

</Setter.Value>

</Setter>

But i'm not able to change the color to white outside of the edit mode.

Can you please give me a hint?

Thanks
Andreas

GridView

answered on 01 Mar 2013

9 answers

702 views

Multiple select binding

Hi telerik,

I have a collection of objects bound to the a ListBox, and the SelectionMode set to "Multiple".

The objects have a property "IsSelected". 

How do I bind this property to the ListBox?

I want the property of the object to change when the user selects an item.

Thanks for help
Michael

ListBox

answered on 01 Mar 2013

1 answer

162 views

Render related Appointments on same line in Timeline View

I have a situation where I would like to ensure that related appointments shown in Timeline View of the ScheduleView are displayed in sequence, on the same line in the view.

Scenario:
I'm using the ScheduleView to render "jobs" (each represented by an appointment instance). Some of these jobs are related to the same customer and occur in sequence - one starts when another one finishes.
Using the defaults, the Schedule sometimes renders such appointments next to each other, on the same line, but other times these appoinments are split across multiple lines.

Please see the attached screenshot for an example.
In the attached example I would like to ensure that the three appointments in red boxes are always rendered on the same line in Timeline view, because they are related to the same customer.

I have thought about using resources - one for each customer - but this will cause most jobs to be placed on its own line, which in turn will result in too much wasted screen space. The user will have to use vertical scrolling more to see all jobs. So I would like to achieve this without using resource grouping.

Is this possible to do?

ScheduleView

answered on 01 Mar 2013

1 answer

128 views

live GroupHeaderRow Background color

Hi, I am using the following datatemplate to give different background color to the GroupHeaderRow

<telerik:RadGridView.GroupHeaderTemplate>

<DataTemplate>

<StackPanel Orientation="Horizontal">

<CheckBox localBehavior:CheckBoxBehavior.IsEnabled="True" IsThreeState="True" Margin="0 0 3 0"/>

<TextBlock Text="{Binding Group.Key}" Background="{Binding Path=Group.Items, Converter={StaticResource GroupHeaderColorResourceValueConverter}}"/>

</StackPanel>

</DataTemplate>

</telerik:RadGridView.GroupHeaderTemplate>

The .GroupHeaderColorResourceValueConverter will take the Group.Items as the input parameter and use certain property of the items to return different background color.

However, when the property of the item changes, the GroupRowBackground color is not changed. Is there a way to make the GroupViewModel to fire an event so the GroupHeaderRow can get the noticiation from it's ViewModel to refelect the changes?

I tried the approach in the following link but it does not seem to work for the background color.
http://blogs.telerik.com/vladimirenchev/posts/10-10-04/fast-real-time-data-update-for-your-silverlight-and-wpf-applications.aspx

Thanks

GridView

answered on 01 Mar 2013

1 answer

112 views

PieSeries.SliceStyles in a Resource Dictionary

I wanted to know if we can declare the PieSeries.SliceStyles in a separate Style tag in a resource dictionary and refer to it so that the PieDataPoints can pick the colors and strokes etc.. from there??

ChartView

answered on 01 Mar 2013

1 answer

473 views

Multiselect and Selecting Parent Items

Hello,

The setup:
- RadTreeView bound to an hierarchy.
- SelectMode is Multiselect
- Each node has an IsSelected property, RadTreeViewItem is bound to it using a style.

And one of requirements is that when a child is selected then all his parents should be selected too. And we've run into a problem implementing it.

Reproducing the problem:
- Expand parent node without selecting
- Click on a child
- The Child is selected and his parent too
- Click again on child
At this moment parent is unselected by the TreeView, while child is still selected.

Definition of IsSelected property:

public bool IsSelected

{

get { return isSelected; }

set

{

if (value == isSelected)

return;

isSelected = value;

NotifyOfPropertyChange(() => IsSelected);

if (Parent != null)

Parent.IsSelected = isSelected;

}

When clicking second time on a child, the IsSelected setter isn't called on a child, but sets to false for parent.

Basically I'd like to keep a visual "selection chain" from children to parent nodes. Anything special should be done in order to keep parent nodes selected?

Thanks

TreeView

answered on 01 Mar 2013

8 answers

283 views

Coloring Candlesticks

Hi,

Is there a possibility to set a different color to each one of the candlesticks?

ChartView

answered on 28 Feb 2013

1 answer

50 views

Error throws while changing zoom level to random number

Error throws when changing the zoom level to a random number of value say a huge digit(5334243223). This leads to application crash. To avoid this, I want to know the exact event/method to capture it and show the messagebox insted.

Any help would be appreciated!

Thanks
Raj

ImageEditor

answered on 28 Feb 2013