WPF Discussion Boards

Mycroft Holmes21-Apr-13 23:59

21-Apr-13 23:59

My bad - try this nifty focus change wpf navigation example[^]

Never underestimate the power of human stupidity
RAH

KishoreUHG22-Apr-13 0:08

KishoreUHG

22-Apr-13 0:08

didnt find any solution..

Wayne Gaylard22-Apr-13 1:44

Wayne Gaylard

22-Apr-13 1:44

I generally override the OnStartup method on my App class and then call my Login View modally, which returns a bool indicating whether login was successful. Something like this (very simplified):-

LoginView login = new LoginView(); //instantiate new login view
login.ShowDialog();
if(login.LoginSuccess)
{
    Mainwindow window = new Mainwindow();
}
else
{
    //do something if login not successful
}

When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman

KishoreUHG22-Apr-13 2:52

KishoreUHG

22-Apr-13 2:52

Found the solution Smile | :)

Mycroft Holmes22-Apr-13 12:59

Re: WPF Simular to tree view

22-Apr-13 12:59

Excellent! It is a good idea to link to the articles/resources that you found useful as they will help the next person when they search this forum.

Never underestimate the power of human stupidity
RAH

WPF Simular to tree view

Saksida Bojan21-Apr-13 9:52

Saksida Bojan

21-Apr-13 9:52

Hello.

I would like to present in a flat area a tree like view.

Each item would be a non-movable panel with its own controls. Each child will have connected with a line (Also selectable). On top of it, some childs are going to have multiple parrents. The closest that i have seen to compare is code map in VS2012 Update 2.

Example: Panel 1 and 2 are parents of panel 3

Panel1  Panel2
  |       |
  ---------
      |
    Panel3

I would like some pointers where to go, or if there is a custom control as long as it is free and can redistribute with or without source code. When i finish my personal project i will release source. As i am hobbiest programmer, my understanding on WPF is limited, so thank you for your time and patience.

Richard MacCutchan21-Apr-13 22:39

Richard MacCutchan

21-Apr-13 22:39

Check the WPF articles section[^]; there are many samples that will help you.

Use the best guess

Re: WPF Simular to tree view

Saksida Bojan2-May-13 7:41

Saksida Bojan

2-May-13 7:41

Thanks for suggestion, but i didn't knew what to search. I am currently reading a WPF book and in a book i saw word diagram in it. At that moment i found WPF Diagram Designer article that is perfect. Since my native language is not english i could not remeber word, that would help me search on google

WPF User Controls - Interacting With Other Controls

Kevin Marois19-Apr-13 5:10

Kevin Marois

19-Apr-13 5:10

Maybe this is a simple question...

I created a search control in WPF. I then placed it on a view. Since the view doesn't know about the user control, how can it get data off of it, or make calls into it.

I tried using a messenger, but when there is more than one instance of the user control running, they al get the message.

What's the right way to do this?

Thanks

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

Re: WPF User Controls - Interacting With Other Controls

Mycroft Holmes19-Apr-13 13:19

Re: WPF User Controls - Interacting With Other Controls

19-Apr-13 13:19

Maxx wrote an article where his messages have a destination that consumes the message and it does not propagate further.

Just off the top of my head I would create a search interface on each VM that handles the interaction and pass the VM to the search VM onnavigateto of the view.

Never underestimate the power of human stupidity
RAH

Kevin Marois19-Apr-13 13:21

Kevin Marois

19-Apr-13 13:21

Thanks

Can you point me to the article?

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

Re: WPF User Controls - Interacting With Other Controls

Mycroft Holmes19-Apr-13 13:26

Re: WPF User Controls - Interacting With Other Controls

19-Apr-13 13:26

Bastards got 3 Xs[^] and underscores in his name, amazing what the mind thinks it sees

Never underestimate the power of human stupidity
RAH

_Maxxx_7-May-13 20:09

_Maxxx_

7-May-13 20:09

Sorry about the XXX and _

It was originally underscore free but I had some hassle with the account and creatged a new one - and it wouldn't let me use Maxxx.

I actually wanted to use .\\axxx but it wouldn't let me do that either Frown | :(

Thanks for referring to my article, BTW

MVVM# - See how I did MVVM my way
___________________________________________
Man, you're a god. - walterhevedeich 26/05/2011

.\\axxx
(That's an 'M')

Re: WPF User Controls - Interacting With Other Controls

SledgeHammer0124-Apr-13 8:48

SledgeHammer01

24-Apr-13 8:48

Not quite sure an "e.Handled = true" concept in messenger makes sense since the messages are going to be propogated in a random/arbitrary/indeterminate order. Its really up to the subscriber to determine if the message should be handled. Your "e.Handled = true" concept might just mean that somebody handled it and its up to the subcriber to play nice and check the flag. A lot of messenger implementations fire & forget the notifications in async mode too. Then it makes even less sense.

Re: WPF User Controls - Interacting With Other Controls

Mycroft Holmes24-Apr-13 12:25

Re: WPF User Controls - Interacting With Other Controls

24-Apr-13 12:25

I'm afraid I subscribe to fire and forget school and have not implemented the Handled concept. I do have trouble defining the boundaries of where a message should be used!

Never underestimate the power of human stupidity
RAH

Kevin Marois25-Apr-13 10:54

Kevin Marois

25-Apr-13 10:54

Now that I'v had a few days to thin about it, the subscriber should pass in it's id to the control Init. Could be a PK or a guid. If there are 3 tabs open, each instance of control would be intiailized with a different id.

Then, each subsequent call would have that Id passed with it. Then control's methods would only act if the Id passed in the message matches that sent in the 'init' method.

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

Re: WPF User Controls - Interacting With Other Controls

_Maxxx_7-May-13 20:20

_Maxxx_

7-May-13 20:20

That's about how I would do it - although pass a reference to the object rather than just an Id - you then have the advantage of being able to access the object in question from your consumer.

Send Message - "I've just updated this Customer"

Receive Message - do nothing - not interested in this customer
Receive Message - update my list of customers as the value in the CustomerType property matches my filtering criteria.
Receive Message - I'm displaying this actual customer - so I'll refresh myself

the 'handled' approach can be useful; my example is selecting a customer to edit from a list.

If an existing customer edit view is out there, in a 'clean' state, it can take over the job of editing the selected customer - but you don't want another view to do the same thing too!

MVVM# - See how I did MVVM my way
___________________________________________
Man, you're a god. - walterhevedeich 26/05/2011

.\\axxx
(That's an 'M')

Data binding validation

columbos1492715-Apr-13 22:13

columbos14927

15-Apr-13 22:13

Hello,
I have a tab control with two tabs in it,in each tab i have text boxes, the data of the text boxes is being validated using the IDataErrorInfo interface.
If there is an invalid data i am rendering a red ellipsis and a tool tip box using this XAML code:

XML

<!--The template which renders a TextBox when it contains invalid data.-->
<ControlTemplate x:Key="TextBoxErrorTemplate">
  <DockPanel>
    <Ellipse DockPanel.Dock="Right"  Margin="2,0" ToolTip="Contains invalid data" Width="10" Height="10" >
      <Ellipse.Fill>
        <LinearGradientBrush>
          <GradientStop Color="#11FF1111" Offset="0" />
          <GradientStop Color="#FFFF0000" Offset="1" />
        </LinearGradientBrush>
      </Ellipse.Fill>
    </Ellipse>
<!--This placeholder occupies where the TextBox will appear.-->
    <AdornedElementPlaceholder />
  </DockPanel>
</ControlTemplate>

Text box XAML:

XML

<!--ID text box-->
<TextBox.Text>
   <Binding Path="ID" UpdateSourceTrigger="PropertyChanged">                                             <Binding.ValidationRules>                                                <DataErrorValidationRule/>                                            </Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>

The problem is when i go to another tab and then come back again the red Ellipses are disappear.

Help any one?

Thanks

Re: Data binding validation

Nupur S. Tiwari16-Apr-13 19:36

Nupur S. Tiwari

16-Apr-13 19:36

On Tab selection change event, give the datacontext to the textboxes.

Say for example for first tab, you have 3 textboxes in a grid and you provide the class object to be bound as datacontext of the grid; when you select that tab, again give the same object as datacontext to the grid.

grid.Datacontext = myClassObject;

Please see if this works for you.

Re: Data binding validation

columbos1492720-Apr-13 2:18

columbos14927

20-Apr-13 2:18

Hey,
No it doesn't work.
The problem is when i switch to another tab and the come back the red Ellipsis disappear.

Thanks.

Extending wpf print dialog

Andreas X15-Apr-13 20:15

Andreas X

15-Apr-13 20:15

Hi!
I have been looking for a way to extend the default printdialog in PresentationFramework. I need to filter the available printers some how. Does anyone know if it is possible either to filter the printer queue datasource or to extend the dialog to add such functionallity?

Andreas Johansson

Senior Software developer at Tieto Sweden

Kenneth Haugland17-Apr-13 21:00

Kenneth Haugland

17-Apr-13 21:00

I dont know exactly what the answer to this should be, but this might be a starty:
Extending C# PrintDialog Part II[^]

Other helpful things might be:
http://social.msdn.microsoft.com/forums/en-US/winforms/thread/a2e1963e-60d6-4d4e-bac5-66fdb41b7b3b[^]

Andreas X17-Apr-13 22:38

Andreas X

17-Apr-13 22:38

Thank you for your reply.
I have already found those articles and posts but they all work with the windows forms version of the printDialog. I cant figure out how to apply the technique to the presentationframework PrintDialog.

Andreas Johansson

Senior software developer at Tieto Sweden

Kenneth Haugland17-Apr-13 23:14

Kenneth Haugland

17-Apr-13 23:14

Well, there is always the option of constructing a completely new PrintFile dialog in WPF from scratch, but that seems like a lot of work..