WPF TextBlock Trigger Question - WPF Discussion Boards

Kevin Marois28-Apr-14 7:18

28-Apr-14 7:18

I am creating a user control. I will be using this user control in a few different apps. Once it's done I'll include its assembly in my project, reference it, and use it in my XAML somewhere. Pretty standard.

The question is... How do I apply a different set of styles to it based on the app I'm in?

Thanks

If it's not broken, fix it until it is

Re: WPF Style Question

Pete O'Hanlon28-Apr-14 7:24

Pete O'Hanlon

28-Apr-14 7:24

The simplest way to achieve this is to have application level themes. In other words, in App A - you would set the styles for your control to be the ones you want in App A; in App B you set the styles for the control based on the ones you want in App B, and so on. Make sure you have a default theme for your control in place as well.

Re: WPF Style Question

Kevin Marois28-Apr-14 7:27

Kevin Marois

28-Apr-14 7:27

Ok, so create a theme. Isn't a theme just a collection of styles?

If it's not broken, fix it until it is

Re: WPF Style Question

Pete O'Hanlon28-Apr-14 8:09

Pete O'Hanlon

28-Apr-14 8:09

Yes.

Re: WPF Style Question

pradeep surya10-May-14 5:37

pradeep surya

10-May-14 5:37

Hi Kevin,

Sorry for late reply to your post.

1.You can create a seperate styles for appA, Appb... and apply the theme accordingly as a staticresource.
2.Suppose in same application you want different theme based on some action then just use the above mentioned idea and apply themes using Dynamicresource.

Thanks.

Pass Logging Method

Kevin Marois24-Apr-14 12:01

Kevin Marois

24-Apr-14 12:01

I don't know why I can't get this to work...

In class A I have

public delegate void LoggingDelegate(string message);

and

public void LogMessage(string message)
{
}

then I want to pass it to class B, so I have:

LoggingDelegate logMessageHandler = LogMessage;
ClassB.SomeMethod(logMessageHandler);

Then in ClassB I have

public void SomeMethod(Delegate logDelegate)
{
   logDelegate.    //<=== Nothing here. Shouldn't I be seeing the LogMessage method signature?
}

WHat's wrong here?

Thanks!

If it's not broken, fix it until it is

Re: Pass Logging Method

Matt T Heffron24-Apr-14 12:49

Matt T Heffron

24-Apr-14 12:49

All ClassB.SomeMethod knows is that logDelegate is a Delegate, not that it is LoggingDelegate.
At least the way you have shown it.
So the IntelliSense knows only that as well.

WPF TextBlock Trigger Question

Kevin Marois24-Apr-14 7:45

Kevin Marois

24-Apr-14 7:45

I am trying to hide a text block. When a Checkbox is checked, it should be hidden. When it's unchecked the textblock should be visible.

The checkbox is bound to an object called SelectedProcess. If SelectedProcess is null, the textblock should be hidden.

Here's my XAML:

<CheckBox IsChecked="{Binding SelectedProcess.Enabled}"
            IsEnabled="{Binding AllowProcessEdit}"
            x:Name="EnabledCheckbox"
            Foreground="Black"
            FontSize="12"
            Margin="10,0,0,0"
            VerticalAlignment="Center"
            HorizontalAlignment="Stretch"/>

<TextBlock Grid.Row="4"
            Foreground="Red"
            FontWeight="Bold"
            FontSize="12"
            VerticalAlignment="Center"
            HorizontalAlignment="Right"
            Text="This process is disabled"
            Margin="10,0,0,0">
                                    
    <TextBlock.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding SelectedProcess}" Value="Null">
                    <Setter Property="UIElement.Visibility" Value="Hidden"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding SelectedProcess.Enabled}" Value="True">
                    <Setter Property="UIElement.Visibility" Value="Hidden"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding SelectedProcess.Enabled}" Value="False">
                    <Setter Property="UIElement.Visibility" Value="Visible"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

It works when SelectedProcess is NOT null, but when SelectedProcess IS null, the text is still visible.

What am I doing wrong here?

Thanks

If it's not broken, fix it until it is

Re: WPF TextBlock Trigger Question

Richard Deeming24-Apr-14 8:24

Richard Deeming

24-Apr-14 8:24

Try Value="{x:Null}" instead.
http://msdn.microsoft.com/en-us/library/ms743649%28v=vs.110%29.aspx[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: WPF TextBlock Trigger Question

Kevin Marois24-Apr-14 8:53

Kevin Marois

24-Apr-14 8:53

That did it. Thank you!

If it's not broken, fix it until it is

Re: WPF TextBlock Trigger Question

BubingaMan4-May-14 22:48

BubingaMan

4-May-14 22:48

Your issue seems fixed, which is great.

However, I wonder why you use datatriggers to accomplish this.
Consider doing it through binding instead with the help of a converter.

If the visibility of the texblock is always directly related to the checkbox being checked / unchecked, then you could use elementbinding to do so.

XML

<TextBlock Visibility="{Binding IsChecked, Converter={StaticResource boolToVisibilityConverter}, ElementName=CheckBoxName}" />

The resulting XAML is simpler and achieves the same result.

I need develop Deepzoom fitBounds Method

joajngwon23-Apr-14 19:58

joajngwon

23-Apr-14 19:58

Hi. i have one question.

I would like to specify the area to zoom in (ex . fence -> rect type )

well. i saw seadragon open source but i can't understand fitBounds Method

too hard viewportOrigin & viewportWidth

how can i calculation multiscaleImage viewport with two points

and make fit bound feature

please help me.

note ) i don't use map control. only multiscaleImage

WPF MVVM Set Focus

Kevin Marois23-Apr-14 17:46

Kevin Marois

23-Apr-14 17:46

I'm trying set focus to a UI element from within a view model.

First, following this example[^] I created the Attached Property.

Then in my VM I created a bool property called "IsHourlyMinutesFocused":

private bool _IsHourlyMinutesFocused;
public bool IsHourlyMinutesFocused
{
    get { return _IsHourlyMinutesFocused; }
    set
    {
        if (_IsHourlyMinutesFocused != value)
        {
            _IsHourlyMinutesFocused = value;
            RaisePropertyChanged("IsHourlyMinutesFocused");
        }
    }
}

Next, I added it to the XAML:

<TextBox Grid.Row="0"
        Grid.Column="2"
        VerticalAlignment="Center"
        classes:FocusExtension.IsFocused="{Binding IsHourlyMinutesFocused}" 
        Focusable="True"
        Text="{Binding SelectedProcess.ProcessSchedule.HourlyMinutes}"
        Margin="2,0,2,0"
        Width="40"/>

When I set IsHourlyMinutesFocused = true, nothing happens. The OnIsFocusedPropertyChanged event in the DP never fires.

What's wrong here?

If it's not broken, fix it until it is

Change application language at Runtime

sifi mohamed amine15-Apr-14 5:40

sifi mohamed amine

15-Apr-14 5:40

Hi ,

I am new in coding WPF MVVM apps.
My question is how to change le language using a combobox at Runtime.
I tried the static resources and it worked well , but trying to change it Runtime using Threading.thread class didn't work.
Is there any possibility to solve that problem.

Thanks a lot for your help.

Re: Change application language at Runtime

Richard Deeming15-Apr-14 5:53

Richard Deeming

15-Apr-14 5:53

This is now the FOURTH time you have asked the same question. Mad | :mad:

DO NOT repost the same question. It won't get your question answered any quicker; if anything, it will just annoy the people who would otherwise be trying to help you, and result in all of your questions being ignored.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Change application language at Runtime

Andy41119-May-14 2:56

Andy411

19-May-14 2:56

Well, even if you posted the almost same questions many times, I try to give you a hint.
Take a look at http://wpflocalizeextension.codeplex.com/[^]

It might be usefull.

Localization in WPF MVVM

sifi mohamed amine14-Apr-14 23:42

sifi mohamed amine

14-Apr-14 23:42

Hi ,
I need to change culture mainly between two languages ; italian and English using the Combobox in WPF MVVM.
I tried to databind the ViewModel with my Mainview but I didn't succeed.
I will be so thankful if someone could help.

Here is my Combobox declaration in xaml :

HTML

<ComboBox IsEditable="True" Text="Language" HorizontalAlignment="Right" VerticalAlignment="Top" Width="95"  Margin="34,21,34,0" ItemsSource="{Binding Languages}" SelectedItem="{Binding SelectedLanguage, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Foreground="#FF434C64" removed="Green" Height="24.96"  />

Here is View Model definition :

public void ChangeLanguage()
         {
             if (SelectedLanguage == "en")
             {
                 Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo("en");

             }
             else
             if (SelectedLanguage == "it-IT")
             {
                 Thread.CurrentThread.CurrentUICulture = new System.Globalization.CultureInfo("it-IT");
             }

         }

Here the declaration within the construcor of my View Model

public ViewModel()
       {

           LoadData();
           ChangeLanguage();

           Login = new DelegateCommand(this.Logging, delegate()
           {
               return (!String.IsNullOrEmpty(Username) && !String.IsNullOrEmpty(Password) && !String.IsNullOrEmpty(Email));
           });
           Register = new DelegateCommand(this.Registering, delegate()
           {

          return (!String.IsNullOrEmpty(Username) && !String.IsNullOrEmpty(Password) && !String.IsNullOrEmpty(Email));



       });

Re: Localization in WPF MVVM

Vincent Beek16-Apr-14 6:57

Vincent Beek

16-Apr-14 6:57

Where is your SelectedLanguage property declaration? What does it look like?

Updating Composition Tree from Visual Tree

Ronald M. Martin14-Apr-14 12:18

Ronald M. Martin

14-Apr-14 12:18

I am implementing scrollable text in a custom control. Each line of text has its own Visual. In the simple case of horizontal scrolling, I replace the Transform of each Visual to produce the desired effect. The scroll bar moves, but the text does not. Am I missing a step that causes the new Transform objects to be reflected (presumably as parameter changes) in the Composition Tree?

Ron Martin

How to add all recommended icon sizes to WPF desktop application?

Matt T Heffron14-Apr-14 11:49

Matt T Heffron

14-Apr-14 11:49

The Microsoft Icon design guidelines http://msdn.microsoft.com/en-us/library/aa511280.aspx[^] specifies the recommended set of icon sizes for a Windows desktop application.

Maybe I haven't looked through enough search results, but I cannot find a reference on how to add the set of sizes of the icon to a WPF desktop application. All I have found is how to add the one icon for the application main window frame.
Can someone offer references or instructions?

All my previous WPF work has been kiosk-style (dedicated instrument control) applications that didn't need icons!

Thanks.

Re: How to add all recommended icon sizes to WPF desktop application?

Matt T Heffron14-Apr-14 13:44

Matt T Heffron

14-Apr-14 13:44

What I didn't recall was that all of the icon sizes co-exist in the single .ico file. D'Oh! | :doh:

How to get TreeView SelectedItem/Value?

BeeDev11-Apr-14 10:52

BeeDev

11-Apr-14 10:52

I have Multiple Lists that are bound to multiple TreeViewItems within the Tree as in the code below. This is working perfectly to display the bound items; however, I couldn't figure out how to get the selected item value. For example, if the user clicks the color Blue, I would like to be able to get that value, in this case "Blue," in order to be able to bind to a property in the ViewModel

XML

<TreeView>
    <TreeViewItem Header="Category" ItemsSource="{Binding Categories}" />
    <TreeViewItem Header="Colors" ItemsSource="{Binding Colors}" />
</TreeView>

Re: How to get TreeView SelectedItem/Value?

SledgeHammer0111-Apr-14 12:14

SledgeHammer01

11-Apr-14 12:14

Are you only going one way? UI -> VM? If so, there is a SelectedItem bindable property on the TreeView that you can use.

If you want two-way binding (set the selection from the VM), that is a lot more work.

Re: How to get TreeView SelectedItem/Value?

BeeDev14-Apr-14 3:48

BeeDev

14-Apr-14 3:48

It is binding from UI to VM. I just need to get the value of the selecteditem, and the SelectedItem of the TreeView is Read Only. So how do I get the Value of the Selected Item? Thanks in advance.

Re: How to get TreeView SelectedItem/Value?

SledgeHammer0114-Apr-14 4:53

SledgeHammer01

14-Apr-14 4:53

So what is the issue? SelectedItem contains your selected item. It is only read only to you. The TreeView control sets internally. You do need to use one way binding though.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.