Dynamically change the location of controls in silverlight - WPF Discussion Boards

ListBox displaying of items problem

15-Sep-09 5:08

Silverlight: Get Started[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Zammy_bg14-Sep-09 4:00

Zammy_bg

14-Sep-09 4:00

Hello,

I have this class:

public class GameObject : ObservableCollection<Property>
  {
      public string Name { get; set; }

      public override string ToString()
      {
          return Name;
      }
  }

Property is my own class.

When I add it to a ListBox it does not call the ToString() method but rather just shows (Collection) in the list box.
Isnt that a bug? Smile | :)

At least seems weird to me. I do not want to change the class heirarchy from inheritance to composition for this problem but if I do not have a choice ill do it.

Re: ListBox displaying of items problem

Pete O'Hanlon14-Sep-09 4:42

Pete O'Hanlon

14-Sep-09 4:42

It's not a bug. You need to supply a template that tells the listbox what to display. Off the top of my head, this is what you'd expect to put into the XAML:

<Window
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:d="http://schemas.microsoft.com/expression/blend/2006" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
  x:Class="GameSampleApp.Window1"
  x:Name="Window"
  Title="Sample App"
  Width="380" Height="240">
  <Window.Resources>
    <Style TargetType="ListBox">
      <Setter Property="Control.FontFamily" Value="Tahoma" />
      <Setter Property="Control.FontSize" Value="10" />
    </Style>
    <Style x:Key="FontStyle">
      <Setter Property="Control.FontFamily" Value="Verdana" />
      <Setter Property="Control.FontStyle" Value="Italic" />
      <Setter Property="Control.FontSize" Value="12"/>
    </Style>
    <DataTemplate x:Key="GamePersonTemplate">
    <Grid>
      <Grid.RowDefinitions>
        <RowDefinition/>
      </Grid.RowDefinitions>
      <Grid.ColumnDefinitions>
        <ColumnDefinition/>
      </Grid.ColumnDefinitions>
      <TextBlock Width="40" Grid.Column="0" 
         Text="{Binding Name, Mode=OneWay}" />
    </Grid>
    </DataTemplate>
  </Window.Resources>
  <Grid x:Name="LayoutRoot">
    <ListBox Padding="3" HorizontalAlignment="Left" Width="Auto" 
      ItemTemplate="{DynamicResource GamePersonTemplate}" 
      ItemsSource="{Binding}" VerticalAlignment="Top" Height="Auto"/>
  </Grid>
</Window>

You'll obviously need to hook your GameObject into the DataContext.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: ListBox displaying of items problem

Richard MacCutchan14-Sep-09 21:43

Richard MacCutchan

14-Sep-09 21:43

Off the top of your head OMG | :OMG:

; we are not worthy.

Re: ListBox displaying of items problem

Pete O'Hanlon14-Sep-09 22:59

Pete O'Hanlon

14-Sep-09 22:59

I do this everyday - this code was easy. Josh Smith's code - now that's hard.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

idea/help in designing forum

hrishiS14-Sep-09 1:14

hrishiS

14-Sep-09 1:14

Hi to all,...

As a academic project, I want to design an website similar to Orkut.com in silverlight....Could anyone please give me some idea or hints on it?

Please give a clue on the dynamism of this kind of websites....how they achieve it?....how once a person logged in , can see his all scraps...is it under that user name, all the scraps are being stored....?....Now if a person changes his photo, the scrapbook on others account also changes the photo....
Basically i need an idea of how they work exactly

Thanks in advance

-----------------------------
I am a beginner

Re: idea/help in designing forum

Michael Sync14-Sep-09 1:54

Michael Sync

14-Sep-09 1:54

I would say that if you are a beginner, it would be the best if you can start working on small project instead of trying for something that is built by Google. Why don't you try simple Data Entey Form, Form authentication and etc first?

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

Microsoft MVP (Silverlight), WPF/Silverlight Insiders

Dynamically change the location of controls in silverlight

Nekkantidivya13-Sep-09 20:36

WPF animations hardware requirements

13-Sep-09 20:36

Hi,

I am working on a silverlight application. In this I have a scroll viewer with Canvas. These two are a module in Page.xaml. In the same way I have different modules in Page.xaml. Some times I need to change the width and height of the canvas and scrolview. At that time I want to change the location of these two components dynamically.

If anyone have any idea to dynamically change the location of the controls please reply me.

Thanks in Advance.

koleraba13-Sep-09 11:12

koleraba

13-Sep-09 11:12

Hi

I am wondering if anybody knows what are the hardware requirements for wpf animations to run. I googled for it but found no answers. What I really want is to programmaticaly determine if the machine(graphic card) supports animations. Any advice will be appreciated.

Uros

Re: WPF animations hardware requirements

Christian Graus13-Sep-09 13:51

Christian Graus

13-Sep-09 13:51

If it's vista, I think you can programatically check the index that Vista has for how fast your computer is, how good your card is, etc. Otherwise, I'd expect you could look into writing DirectX code that checks if aspects of DX are available, that's what we're talking about, after all.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Re: WPF animations hardware requirements

Mark Salsbery14-Sep-09 10:35

Can I use excel spreadsheet as a datagrid In a WPF Client?

14-Sep-09 10:35

WPF uses DirectX/Direct3D, so I reckon if you can run a WPF app,
you can use WPF animation.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

bgundas12-Sep-09 12:08

bgundas

12-Sep-09 12:08

Is there a way to use excel spreadsheet ***as a datagrid*** in a WPF client-server application?

I know i can use WindowsFormsHost control in a WPF client application to host a winforms WebBrowser control, however this is really not a straight forward way of doing it.

I was wondering if you would know any other way of using excel spreadsheet ***as a datagrid*** in WPF client?

Dyanmically assign source to a Medial element.

Nekkantidivya12-Sep-09 2:01

Re: Dyanmically assign source to a Medial element.

12-Sep-09 2:01

Hi,

I am working with a Media elememt in my application. In this I need to assign source to Media element dynamically. For I tryed with the below code. I am not getting any error but the video is displaying.

VideoControl.Source = new Uri(@"F:\Backup090909\AdRotator\Butterfly.wmv", UriKind.Absolute);

VideoControl.AutoPlay = true;

If anyone have any idea to solve this please reply me.

Thanks in Advance.

Mark Salsbery12-Sep-09 7:14

Getting ObservableCollection ThreadSafe

12-Sep-09 7:14

You can't use FILE:// URIs from a Silverlight application because
Silverlight applications don't have direct access to local drives.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

ezazazel11-Sep-09 4:35

ezazazel

11-Sep-09 4:35

Hi guys!

Experiencing something weird recently.
Due to the fact, that my observable collection is the datacontext of my wpf app,
I need to make sure, that every Thread is able to add Elements.
Now the easy and working way is to add a

Dispatcher.Invoke(new Action(()=>{collection.Add(element}));

from every method being allowed to do so, which is kind of annoying.
So I thought it would be a good idea to add the functionality to the observable collection itself.
This is what I came up with:

class MElementsCollection :ObservableCollection<MElement>
    {
        #region Variables
        private Dispatcher mainDipatcher;

        public Dispatcher MainDipatcher
        {
            get {
                if (mainDipatcher == null)
                    mainDipatcher = App.MainDispatcher;
                return mainDipatcher; 
            }
        }
        #endregion

        public void AddThreadSafe(MElement mElement)
        {
            if (Thread.CurrentThread != MainDipatcher.Thread)
            {                
                    MainDipatcher.Invoke(new Action(() =>
                        {
                            this.Add(mElement);
                        }));
                
            }
            else
                this.Add(mElement);
        }
    }

Now what's actually happening is, that by adding many items short one after another, not every item is added to the collection but just for example every second one.

Can anyone please help me with this?

As always,
Thank you in advance

Re: Getting ObservableCollection ThreadSafe

Pete O'Hanlon11-Sep-09 4:40

Pete O'Hanlon

11-Sep-09 4:40

Why not take a look at Tamir's implementation here[^]? There's no need to reinvent the wheel here.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys | Onyx

Re: Getting ObservableCollection ThreadSafe

ezazazel11-Sep-09 5:08

ezazazel

11-Sep-09 5:08

Thank you!

Save the video from the Openfile dialog to a folder

Nekkantidivya11-Sep-09 2:49

Upload and display videos

11-Sep-09 2:49

Hi,

I am working on a silver light application. In this I need to upload videos, save them in afolder and retrieve them back to display. In this I need to save the uploaded video in a folder for retrieving later.

I came across some applications where the video is converted to bytes and saved in database and retrieved from there. But as i want the video to be saved in a folder I need to convert the byte[] in to video in a service and save itin my application folder.

If any one have any idea to directly save the slected file in the openfiledialog to a folder or to convert byte[]to video and save it in a folder, please rply me.

Thanks in advance

Nekkantidivya10-Sep-09 19:03

Re: Upload and display videos

10-Sep-09 19:03

Hi,

I am working on a silverlight application in which I need to upload and display videos. These uploaded videos should be saved in a folder and from this folder I need to retrieve the videos and display them in my silverlight application.

If you have any idea to solve this please reply me.
Thanks in advance.

Mark Salsbery11-Sep-09 6:31

11-Sep-09 6:31

What part of this are you having problems with?

The System.IO Namespace[^] should have everything you need
to work with directories and files.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

WPF or WinForms?

Gilliann10-Sep-09 16:13

Gilliann

10-Sep-09 16:13

I've been learning c# for about 2 months now and have already made some pretty useful winform applications. With that said I feel that I have a decent understanding of c# although there is still plenty to learn. I'm at the point now where I find myself wanting to experiment with custom controls. At this point I'm not sure if I should continue to learn WinForm's or shift my focus on WPF as it seems to be the emerging tech.

Any advice would be great.

Thanks!

Christian Graus10-Sep-09 17:20

Christian Graus

10-Sep-09 17:20

WPF is gaining foothold, I suspect more and more apps will use winforms in the future. Have you learned proper C#, things like different container classes, how to handle objects that are IDisposable, etc ? If not, I'd stick to winforms while learning the language a little better. Then I'd look into WPF.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Ian Shlasko11-Sep-09 6:55

Ian Shlasko

11-Sep-09 6:55

Christian Graus wrote:
WPF is gaining foothold, I suspect more and more apps will use ~~winforms~~ WPF in the future.

I think that's what Christian meant to say Smile | :)

Proud to have finally moved to the A-Ark. Which one are you in?
Developer, Author (Guardians of Xen)

BurNingFat12-Sep-09 21:41

BurNingFat

12-Sep-09 21:41

i totally think you shoud turn to the WPF,as we know,some parts of the VS2010 is designed by WPF,so i think the microsoft will think highly of the WPF,and wo know the route MFC->WinForms->WPF.so we shoud learn the new tech~
sorry,my english is poor --!