WPF Discussion Boards

3-Apr-09 4:01

The first thing I'd suggest here would be that this is a perfect candidate for applying an MVVM pattern to an application. The second thing I'd suggest is that you might want to look into Prism[^] the Composite WPF/Silverlight P and P from Microsoft.

"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.

Re: WPF "Skinning"

Steve The Plant3-Apr-09 4:10

Steve The Plant

3-Apr-09 4:10

I'll check that out, Thanks!

Re: WPF "Skinning"

Pete O'Hanlon3-Apr-09 4:18

3-Apr-09 4:18

You're welcome.

"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.

WPF Printing Fuzzy

JensMig2-Apr-09 10:19

JensMig

2-Apr-09 10:19

I want to print a simple visual to a printer (some lines and some text, rendered as an image that is then printed).
On my local printer this works perfectly, sharp lines and text. But on another printer, a label printer, the output looks fuzzy, the lines are ragged but only on one side.
A printed test page (via the printer settings dialog from Windows) looks fine, so the printer is capable of printing high resolution. I tried to set some job properties, print quality and so on but no effect.
Has anyone an idea here? Thank you!

XmlDataProvider

mikla5212-Apr-09 6:13

mikla521

2-Apr-09 6:13

I have a DataTemplate like this: (more actually...)

<DataTemplate x:Key="ProductListTemplate">
<Expander Name="ProductExpander" Header="{Binding Path=ProductName}">

<TextBlock Text="{Binding Path=ProductId}"></TextBlock>
<Image></Image>

</Expander>
</Border>
</DataTemplate>

... a ListBox like this:

<ListBox Name="productListbox" 
ItemTemplate="{StaticResource ProductListTemplate}" 
</ListBox>

Now the tricky part, if it ever can be solved?
How can I use an XmlDataProvider to populate Image source?
The Listbox contains a lot more products than necessary amount of pictures. Same picture for several products. The xml file:

<PicDb>
<Product Name="W705">
<Image>graphics/W705.png</Image>
</Product>
<Product Name="W715">
<Image>graphics/W705.png</Image>
</Product>

...
</PicDb

The Expander header binding and textbox binding works fine, binds to a data class.
Can't figure out how to do it Frown | :(

Anyone? Do you get the idea? Let's say that the expanders header result in a string "W705", then I want to use the xml file as a lookuptable and load the expanders image with "graphics/W705.png". But it doesn't seem to work with a mix of binding like that?

hb521342142-Apr-09 11:37

hb52134214

2-Apr-09 11:37

This might offer some ideas:
ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.en/wpf_conceptual/html/7dcd018f-16aa-4870-8e47-c1b4ea31e574.htm

If PicDb is a separate data struture, maybe binding to a method and passing the name could work. In that case:
ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.en/wpf_conceptual/html/5f55e71e-2182-42a0-88d1-700cc1427a7a.htm

Pete O'Hanlon2-Apr-09 22:18

2-Apr-09 22:18

If you don't want to go the whole MVVM route, a simple fix is to use a ValueConverter here. Consider the following sample converter code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Windows.Media.Imaging;

namespace SampleWpfApplication
{
  public class SimpleImageConverter : IValueConverter
  {

    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      Uri uri = new Uri(value.ToString(), UriKind.Absolute);
      BitmapImage img = new BitmapImage(uri);
      return img;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      throw new NotImplementedException();
    }

    #endregion
  }
}

To use the converter, you add a reference to it in your Resources

section:<local:SimpleImageConverter x:Key="MyConverter" />

Finally, you bind to it using:<Image Source="{Binding ImageItem, Converter={StaticResource MyConverter}}" />It's that simple.

"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.

ABitSmart2-Apr-09 23:28

ABitSmart

2-Apr-09 23:28

If you see Pete's post, you could just read your XML file in the converter and get the image name for the passed in header string. This will avoid you having to bother about multiple datasources in XAML.

If you still want to use XMLDataProvider, you could use a MultiValueConverter. Passing in the XMLDataProvider and the Header string to the converter.

Why does WPF ignore stuff?

mikla5215-Apr-09 1:45

mikla521

5-Apr-09 1:45

Helped me a lot!! Thanks!

RugbyLeague2-Apr-09 4:09

2-Apr-09 4:09

If I insert the following bit of XAML:

<TextBlock Background="AliceBlue" DataContext="{Binding FOO}"<br />
           Text="{Binding StringFormat='Selected: {0:N0}', Path=BAR}"/ >

there is nothing in my project called FOO and certainly nothing called BAR - yet there is no error - nothing in output - the whole thing is just ignored.

Why does WPF ignore stuff?

Pete O'Hanlon2-Apr-09 4:42

2-Apr-09 4:42

I'm surprised that you haven't seen something in your Output window. What you might want to do, is use the diagnostics attached property:

<TextBlock Background="AliceBlue" DataContext="{Binding FOO, diag:PresentationTraceSources.TraceLevel=High}"
Text="{Binding StringFormat='Selected: {0:N0}', 
Path=BAR, diag:PresentationTraceSources.TraceLevel=High}"/ >

To add this in, you need to map to the diagnostics namespace:

xmlns:diag="clr-namespace:System.Diagnostics;assembly=WindowsBase"

This feature was introduced in .NET 3.5.

"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.

RugbyLeague2-Apr-09 4:46

2-Apr-09 4:46

Thanks, it appears I was missing

DataContext="{Binding RelativeSource={RelativeSource self}}

at the top of the tree but why that should mean WPF just ignores stuff is beyond me. Still, it only wasted a few hours - it's a good job there is no swear jar here.

Mark Salsbery2-Apr-09 5:35

Mark Salsbery

2-Apr-09 5:35

It's ignored by design. If the binding path doesn't exist then
it is quietly ignored. If the result is nothing to render, then
you're not going to see anything Smile | :)

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

RugbyLeague2-Apr-09 5:39

2-Apr-09 5:39

Thanks for the info.

I am sure that decision made sense to somebody - I have just spent ages messing around with my layout wondering why on earth a textblock wasn't showing - I mean everything compiled, there was no output messages so it had to be layout right? I will know better next time I suppose.

Mark Salsbery2-Apr-09 5:49

Mark Salsbery

2-Apr-09 5:49

RugbyLeague wrote:
I have just spent ages messing around with my layout wondering why on earth a textblock wasn't showing

Simply putting some static text like Text="Test" would have immediately shown
whether it was a layout or a binding problem... Poke tongue | ;-P

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

RugbyLeague2-Apr-09 5:51

Use .XAP file in ASP.Net Website

2-Apr-09 5:51

That's the first thing I did - it appeared as expected - but I refused to believe it Laugh | :laugh:

pavanip2-Apr-09 2:42

pavanip

2-Apr-09 2:42

Hi,

I am facing problem with using .XAP file in ASP.Net Website. I have written the following code to use .XAP in .Aspx page
<form id="form1" runat="server">
<div style="height:100%; background-color:#282828;" align="right">

<table width="100%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td width="1%"></td>
</tr>
<tr>
<td width="1%">
<div style="height:100%; background-color:#282828;" align="right">--%>
<asp:Silverlight ID="Xaml1" runat="server" Source="~/ClientBin/SilverlightApplication.xap" MinimumVersion="2.0.31005.0" Width="100%" Height="100%" />
</div>
</td>
</tr>
<table>
If i write like that is only assigned to particular row but i want it for whole page. If I write <asp:silverlight> control after form tag then the silverlight content is assigned above the table and the table data seperated from silverlight content.
Please see the below link to drag and drop videos but that drag and drop videos is not working outside that row only within that row.
http://219.91.199.132/silverl/home.aspx
Can you please guide me how to user .XAP file to whole aspx page.

Thanks in Advance
Pavani

Re: Use .XAP file in ASP.Net Website

Mark Salsbery2-Apr-09 5:21

Mark Salsbery

2-Apr-09 5:21

pavanip wrote:
Can you please guide me how to user .XAP file to whole aspx page.

Do you want the Silverlight plugin to take up the entire browser window or
a cell in an HTML table?

Regardless, this isn't really a Silverlight question - you may get better response
on the Web Development board for HTML questions.

Mark

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

WPF codes to play a RTSP multicast or unicast video stream

jklanka1-Apr-09 21:48

jklanka

1-Apr-09 21:48

Hi

Are there any code sample for playing a rtsp or udp stream. I have live555 rtsp streaming server setup in my pc and like to play the stream using a wpf code sample using vs2008.

Will this support. How can I do this.

Please help

Keep element in canvas when dragging it

Pauwels Bart1-Apr-09 20:19

Pauwels Bart

1-Apr-09 20:19

Hi,

I use adorners to move elements in a canvas but I want that those elements stay in the canvas bounderies. So when I drag an element over one of the bounderies, it should stay against that boundery and not cross it.

Now I only check the top and left bounderies with the Canvas.GetLeft and Canvas.GetTop. The width and height of the canvas is variable. Anybody has an idea how I can prevent the elements to cross the right and bottom bounderies?

Thx

ABitSmart1-Apr-09 21:17

ABitSmart

1-Apr-09 21:17

Have you tried ClipToBounds[^] ?

How are you implementing the drag/drop ?

Pauwels Bart1-Apr-09 23:30

Pauwels Bart

1-Apr-09 23:30

I hadn't tried it before but ClipToBounds doesn't work.

When I add a new UIElement (like an image) to the Canvas, I adorn it. That adorner adds a Thumb to each side of the UIElement and that thumbs handles the drag function.

// Handler for moving.
private void HandleMove(object sender, DragDeltaEventArgs args)
{
    // Horizontal position.
    if (StanagCanvas.GetLeft(this.AdornedElement) + args.HorizontalChange < 0)
    {
        // Crossing left boundary.
        StanagCanvas.SetLeft(this.AdornedElement, 0);
    }
    else if (StanagCanvas.GetRight(this.AdornedElement) - args.HorizontalChange < 0)
    {
        // Crossing right boundary.
        StanagCanvas.SetRight(this.AdornedElement, 0);
    }
    else
    {
        StanagCanvas.SetLeft(this.AdornedElement, StanagCanvas.GetLeft(this.AdornedElement) + args.HorizontalChange);
    }

    // Vertical position.
    if (StanagCanvas.GetTop(this.AdornedElement) + args.VerticalChange < 0)
    {
        // Crossing top boundary.
        StanagCanvas.SetTop(this.AdornedElement, 0);
    }
    else if (StanagCanvas.GetBottom(this.AdornedElement) - args.VerticalChange < 0)
    {
        // Crossing bottom boundary.
        StanagCanvas.SetBottom(this.AdornedElement, 0);
    }
    else
    {
        StanagCanvas.SetTop(this.AdornedElement, StanagCanvas.GetTop(this.AdornedElement) + args.VerticalChange);
    }
}

(StanagCanvas derives from Canvas)

Offcourse the Right and Bottom properties don't work because I allready use the Left and Top properties. The element doesn't cross the left and top boundery of the canvas.

I hope this is enough information.

ABitSmart2-Apr-09 5:05

ABitSmart

2-Apr-09 5:05

You could do it without the Right/Top properties. Something like,

else if ( (StanagCanvas.GetLeft(this.AdornedElement) + this.AdornedElement.Width + args.HorizontalChange) > yourCanvas.Width )
{
    // Crossing right boundary.
    StanagCanvas.SetLeft(this.AdornedElement, yourCanvas.Width - this.AdornedElement.Width);
}