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Thanks!
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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OtherClass.Subscribe<someclass>(_ => KeepWorking = !KeepWorking);
KeepWorking is a bool
This works fine, but what is Lambda expression _ =>
Best regards
Agha Khan
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MSDN explains Lamda Expressions here[^].
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Hi,
I'm facing a problem to bind a StoryBoard to a label in my WPF application.
My XAML lloks like this:
<Label Height="28" Margin="308,27,250,0" Name="PostingStatusLabel" VerticalAlignment="Top" HorizontalContentAlignment="Left" Foreground="ForestGreen" FontWeight="bold">
<ContentPresenter Content="Posting"></ContentPresenter>
<Label.Triggers>
<DataTrigger Binding="{Binding IsPendingPostExist}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<StringAnimationUsingKeyFrames Storyboard.TargetName="PostingStatusLabel" Storyboard.TargetProperty="(Label.Content)"
RepeatBehavior="Forever" FillBehavior="HoldEnd">
<DiscreteStringKeyFrame Value="Posting" KeyTime="0:0:0.0" />
<DiscreteStringKeyFrame Value="Posting." KeyTime="0:0:0.25" />
<DiscreteStringKeyFrame Value="Posting.." KeyTime="0:0:0.5" />
<DiscreteStringKeyFrame Value="Posting..." KeyTime="0:0:1" />
<DiscreteStringKeyFrame Value="Posting...." KeyTime="0:0:1.25" />
<DiscreteStringKeyFrame Value="Posting....." KeyTime="0:0:1.5" />
<DiscreteStringKeyFrame Value="Posting......" KeyTime="0:0:1.75" />
</StringAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</Label.Triggers>
</Label>
When I'm trying to run this application.I get XAMLParseExeption at the start of Label.Triggers tag.
Anyone?
Best regards,
Eli
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<Style x:Key="LabelStyle1" TargetType="{x:Type Label}">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Padding" Value="5"/>
<Setter Property="HorizontalContentAlignment" Value="Left"/>
<Setter Property="VerticalContentAlignment" Value="Top"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Label}">
<ControlTemplate.Resources>
<Storyboard x:Key="Storyboard1">
<ObjectAnimationUsingKeyFrames
Storyboard.TargetProperty="(ContentControl.Content)" Storyboard.TargetName="contentPresenter"
RepeatBehavior="Forever" FillBehavior="HoldEnd">
<DiscreteObjectKeyFrame KeyTime="0:0:0.3" Value="Posting."/>
<DiscreteObjectKeyFrame KeyTime="0:0:0.6" Value="Posting.."/>
<DiscreteObjectKeyFrame KeyTime="0:0:0.9" Value="Posting.."/>
<DiscreteObjectKeyFrame KeyTime="0:0:1.2" Value="Posting..."/>
<DiscreteObjectKeyFrame KeyTime="0:0:1.5" Value="Posting...."/>
<DiscreteObjectKeyFrame KeyTime="0:0:1.8" Value="Posting....."/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</ControlTemplate.Resources>
<Border BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"
Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
<ContentPresenter x:Name="contentPresenter"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Border>
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding IsPendingPostExist}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource Storyboard1}"/>
</DataTrigger.EnterActions>
</DataTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>Then all you need to is define your label like this:
<Label
Content="Posting" HorizontalAlignment="Left"
VerticalAlignment="Top" Foreground="ForestGreen"
Style="{StaticResource LabelStyle1}"/>
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Hi,
Thanks,it is working... 
I have one more question:
I'm trying to stop the story board when the trigger is being changed from true to false.
I've set the story board name,and trying to stop it like this:
<Storyboard x:Key="Storyboard1" x:Name="Storyboard1">
.
.
.
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding IsPendingPostExist}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource Storyboard1}"/>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<StopStoryboard BeginStoryboardName="Storyboard1"/>
</DataTrigger>
</ControlTemplate.Triggers>
but when the trigger switches to false,I receive the following InvalidOperationException:
"Storyboard1 object Name found but it is not a BeginStoryboard object."
Is there something I'm missing?
Thanks again,
Eli
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The reason is, you haven't named the storyboard part you think you have. The key here is that it's BeginStoryboardName - which tells you that you need to apply a name to BeginStoryboard. Add a name to BeginStoryboard, and then use this name in the StopStoryboard.
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Beginners faults...
Thanks a lot..
Best regards,
Eli
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No problem. This is what we're here for - to help.
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+5 for patience and persistence
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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Hi All,
I am using the WPF ribbon Library in my application for getting a ribbon control attached in my application.
I need the functionality where I can trap the minimize event in ribbon and do some additional stuff of code in there.
But, to my surprise I could not find any property named Minimized in ribbon .. I could found out collapsed and Expanded but they were of no use.
Can some body tell me what does IsMinimize property correspond to. As,if I know for which property the minimize functionality is attached,I can then easily solve my problem statement.
-Kushagra
I believe in Me !!!
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Hey,
I have in my application(wpf) an Indicator for all Input Boxes, wich indicate if the box is a mandatory field or not, and changes his color if the Field is filled.
Now the product team would like to have this indicator even on radiobuttons, that means the indicator of the radiobutton should know if the others radiobuttons of the same group are filled or not to change the color to the right one.
We have a new requiredradiobutton control wich derive from the Original Control: RadioButton, and i have to programm the Indicator of the control something like that:
protected override void OnChecked(RoutedEventArgs e)
{
RadioButtonGroup myradiobuttonsgroup = this.GetRadioButtonGroup();
foreach(RadionButton rb in myradiobuttonsgroup)
{
if rb.IsChecked != true
rb.Indicator.Status = Status.NotFilled;
else
rb.Indicator.Status = Status.Filled;
}
}
Or Another way how i can handle that without puting the radiobuttons in a listbox or something.
Thanks a lot and Cheers.
Negada
modified 15-Nov-11 3:41am.
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The way I understand it, you want the indicator in the NotFilled state if none of the radio button within the group are checked and the Filled state if at least on of the radio button (within the same group) is checked.
If this is correct, then your code is most likely wrong, this way it will set the indicator status based on the last radio button examined. Do something like
rb.Indicator.Status = myradiobuttongroup.Any(p=>p.IsChecked) ? Status.Filled : Status.NotFilled;
(not tested, may need polishing)
H.
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Hey, thanks for replying, yes u understand it right, i know the code was just an example.. what i really need is how to get the radiogroup of my radiobutton, and if i get the radiogroup how can i get all its radiobuttons..
cheers
modified 15-Nov-11 8:10am.
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There's no RadioButtonGroup in WPF/Silverlight AFAIK. Radio buttons are grouped by either using them in a single common parent element or using the RadioButton.GroupName property.
Mark Salsbery
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Yes that whats i mean, how can i get all radiobuttons of a panel/window with the same groupname?
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Can't you use databinding between the indicators and the Indicator.Status property? That would be the WPF way...
Mark Salsbery
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Mark, i dont need for binding because i programm the logic in the control, anyway changing the indicator status isnt a problem.. what i need is how to find out all the radiobuttons if i have the groupname of one of them.
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Iterate through the Panel.Children collection and check each elements type. If it's one of your radio buttons then check its GroupName property. VisualTreeHelper.GetChild[^] can help...
Mark Salsbery
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Mark's method of iterating through all the children is the only public method. Lots of us use a class thats available on the internet called VisualTreeExtensions that does essentially the same thing, but wraps that code in an extension method for you. A GetVisualDecendants<RadioButton>(); call would return all the radio buttons. You could expand that to include the group name. Pretty much the same thing as what Mark suggested though.
If you are willing to use reflection, all that information has already been collected. RadioButton has a private member: private static Hashtable _groupNameToElements; thats a HashTable of ArrayLists using the group name as the key.
Some purists may frown on accessing a base class's internal data since it can easily change, but honestly, in this case, I don't see that happening. I'd just derive a class from RadioButton and implement a method that accesses _groupNameToElements so in the slight 1% chance that Microsoft ever does change that, you only need to change one place.
EDIT: See Petes post for a good point about my _groupNameToElements method  .
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Hoo boy, there's a big catch in sorting this that you need to be aware of. The Group Name is not a unique property. What do I mean by this? Well, suppose you create a usercontrol that consists of a group of radio buttons with a single group name, and then you apply that control in more than one location, then the group name would span ALL the radio buttons that contain this group name.
This is a "by-design" feature of WPF, which is intended to allow you to spread your radio buttons across multiple containers.
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Shouldn't really be an issue since you need to iterate through the visual tree to find all the radio buttons.
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It is if you start too high up the Visual Tree. In the example I talked about above, if you start at the root node, you will hit this problem.
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Thank you all for The Assistance
Cheers
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Hello,
I have a frame grabber and a DLL suplied by the FG company which alows me grab frames from the grabber.
When i write an application which directly interacts with the FG DLL every thing works fine:i initialize the FG and every captured frame the DLL trigers an event and the event handler is in my application.
What i did next is to write my own DLL which will wrap the FG DLL and will grab frames and hand it to the application.
The DLL that i wrote i used the MAF technology so my DLL is actualy an addin.
The problem is that the event handler in my addin never executed though i use the same initializations as before.
It seems that the event either never triggered or for some reason the event handler dont catch the event.
Any body have an idea for this problem?
Thanks
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