Found the Answer - WPF Discussion Boards

thrakazog22-Jul-08 13:39

22-Jul-08 13:39

Sorry, I'm working with Visual Studio. I'm writing my own User control. While that control is running in design time it's going to collect some information such as its parent window code file location. So once the control is placed on the window it is going to fill in my custom string property ParentWindowPath.

Once my property ParentWindowPath changes from its default, that new value should show up in the XAML. However, the XAML never sees the change.

Now if I select my control on the designer, the Visual Studio Properties window does display the new value. From this know my property is being correctly set.

Jammer22-Jul-08 13:50

22-Jul-08 13:50

I've never seen XAML 'change' ... irrespective of what properties I set in C# ...

Are you expecting to see something like MyCustomPropertyName="" become MyCustomPropertyName="C:\windowlocation\window.xaml.cs" in your XAML file??

Have a read of this:

http://msdn.microsoft.com/en-us/library/ms753197.aspx[^]

Jammer

Going where everyone here has gone before! Smile | :)

thrakazog22-Jul-08 14:04

22-Jul-08 14:04

Jammer wrote:

Are you expecting to see something like MyCustomPropertyName="" become MyCustomPropertyName="C:\windowlocation\window.xaml.cs" in your XAML file??

Yep, that's exactly what I'm shooting for. It's also exactly the behavior I see if I change MyCustomPropertyName="" to MyCustomPropertyName="C:\windowlocation\window.xaml.cs" using the Properties window.

Since my changes in c# show up in the Properties window I expected them to show up in the XAML as well.

chester22-Jul-08 14:10

chester

22-Jul-08 14:10

I'm not sure I understand this. You're trying to use a computer to record some sort of value for you? and this virtual studio ZHAMEL that you make refernce to, this contains properties and values vis a vis teh interwebs? I have additional questions for you in order for me to help you. I should mention that I've never seen a computer do this before.

thrakazog22-Jul-08 14:14

22-Jul-08 14:14

Hi there Mr. Mountain........ I've got a thread flying straight toward you......

chester22-Jul-08 14:15

chester

22-Jul-08 14:15

Please do be considering to review teh interwebs for solutions twice best again: http://www.the-gog.org/twat.jpg[^]

Jammer22-Jul-08 22:26

22-Jul-08 22:26

XAML doesn't do this ...

Jammer

Going where everyone here has gone before! Smile | :)

Found the Answer

thrakazog23-Jul-08 14:03

How to bind Ilist IN another IList to listBox.

23-Jul-08 14:03

To have your C# code change XAML properties at design time you need to create a separate DLL that talks specifically to the designer for your control. This DLL needs to be named [control name].VisualStudio.Design.Dll and deployed wherever your control.dll is.

Example:

    internal class Metadata : IRegisterMetadata {

        // Called to register design time metadata
        public void Register() {
            AttributeTableBuilder builder = new AttributeTableBuilder();

            //Task
            builder.AddCustomAttributes(typeof(Button), new FeatureAttribute(typeof(TaskProvider)));
            
            MetadataStore.AddAttributeTable(builder.CreateTable());
        }
    }




// class that will change the property
    class TaskProvider : Microsoft.Windows.Design.Interaction.PrimarySelectionTaskProvider
    {
        public TaskProvider()
        {
          
        }

        protected override void Activate(Microsoft.Windows.Design.Model.ModelItem item)
        {

           if (String.IsNullOrEmpty((String)item.Properties["StringProperty"].ComputedValue))
                item.Properties["StringProperty"].SetValue(Guid.NewGuid().ToString()); //sets the value in XAML

            base.Activate(item);
        }
    }

chandra vempati22-Jul-08 4:57

chandra vempati

22-Jul-08 4:57

Hello Friends,

I have a IList collection which consists of IList collection how can i bind them in wpf and get the data...

eg: I have a Ilist<patient> pat
this patient class consists of firstname, lastname and Ilist

add.
so now i want to bind the pat to list box and the list box should even display the values of the add IList....
can any one find solution for this.....

cheers
chandu

One Object Data Provider - Binding two datagrid

Michael Sync20-Jul-08 7:31

Re: One Object Data Provider - Binding two datagrid

20-Jul-08 7:31

I must use only one object data provider in my wpf window. I have two methods that return two collections in code-behinded file. How can I bind those two methods to datagrid? (I'm using third-party datagrid but I think that the binding will be the same.) If I use the methodname in object data provider, i'm able to bind the datagrid. but I want to use one method for one datagrid..

// xmlns:igDP="http://infragistics.com/DataPresenter"

...
<Grid>
<Grid.Resources>
<ObjectDataProvider x:Key="myDataProvider"
ObjectType="{x:Type vm:myViewModel}"
/>
</Grid.Resources>

......

<igDP:XamDataGrid Margin="8,138,8,70" x:Name="mygrid"
DataSource="{Binding Source={StaticResource myDataProvider}, Path=myViewModel.GetDataMethod1}">
</igDP:XamDataGrid>

if I do like that, it will work..

<ObjectDataProvider x:Key="myDataProvider"
ObjectType="{x:Type vm:myViewModel}"
MethodName="GetDataMethod1"/>

I want something like that below but it doesn't work.

<Grid>
<Grid.Resources>
<ObjectDataProvider x:Key="myDataProvider"
ObjectType="{x:Type vm:myViewModel}"
/>
</Grid.Resources>

......

<igDP:XamDataGrid Margin="8,138,8,70" x:Name="mygrid1"
DataSource="{Binding Source={StaticResource myDataProvider}, Path=myViewModel.GetDataMethod1}">
</igDP:XamDataGrid>

<igDP:XamDataGrid Margin="8,138,8,70" x:Name="mygrid2"
DataSource="{Binding Source={StaticResource myDataProvider}, Path=myViewModel.GetDataMethod2}">
</igDP:XamDataGrid>

Any idea? Thanks in advance.

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

Jammer20-Jul-08 10:47

20-Jul-08 10:47

Could the two methods not do the binding instead of the XAML? As far as I know (which isn't far I admit !) an ObjecDataProvider can only execute one method.

Jammer

Going where everyone here has gone before! Smile | :)

Re: One Object Data Provider - Binding two datagrid

Michael Sync20-Jul-08 21:36

Re: One Object Data Provider - Binding two datagrid

20-Jul-08 21:36

Thanks. I will export two public properties and use it in datagrid. Thanks again for your reply, Jammer.

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

Jammer20-Jul-08 22:52

20-Jul-08 22:52

No problem, the xamDataGrid is a great control.

Jammer

Going where everyone here has gone before! Smile | :)

DragSource Event ... has it been removed???

Jammer20-Jul-08 1:38

20-Jul-08 1:38

Hi All,

I'm just looking into implementing some Drag/Drop functionality in an application and I happened across this article:

http://blogs.gotdotnet.com/jaimer/archive/2007/07/12/drag-drop-in-wpf-explained-end-to-end.aspx[^]

The only problem is I've fallen at the first hurdle. I cannot see a DragSource event listed on my Window! Has it been removed or superceeded?

Jammer

Going where everyone here has gone before! Smile | :)

Re: DragSource Event ... has it been removed???

Mark Salsbery20-Jul-08 8:46

Mark Salsbery

20-Jul-08 8:46

DragSource is not an event. It's a UIElement of some kind.

The author doesn't show how it's defined in his sample code Smile | :)

Mark

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

Re: DragSource Event ... has it been removed???

Jammer20-Jul-08 10:49

20-Jul-08 10:49

Oh for goodness sake ... I've gone and made an arse of myself in public AGAIN!

I really shouldn't be trying new things on a Sunday afternoon after a large meal and a few pints ... all the blood is in my stomach! Wink | ;)

Jammer

Going where everyone here has gone before! Smile | :)

WPF and Texture mapping.. need some help =(

SilverD20-Jul-08 0:51

SilverD

20-Jul-08 0:51

Hello people!
I am a bit new to WPF (worked with WinForms till now). What am I trying to do is a sort of texture mapping.
When I was warking with WinForms I was using Directx SDK.
In my program I am getting a byte array that represents pixels in RGB format. for example byte[] arr = {r1,b1,g1,r2,b2,g2...rn,bn,gn};

So each 3 array cells represent one pixel. Then I was creating a MemoryStream. I had pre-written BMP file header, so I just write my header into the stream and then write my array there as well. So now I've got a Stream that represents a BMP image.
Now I've got my image in the stream. Then, in WinForms+ DirectX SDK I was creating a triangle primitive and was drawing my BMP image on this primitive ( texture mapping);

Now I want to do the same thing in WPF. I still have my byte[] arr ;
Here is the code of what I've done:

First of all this is my "Primitive class"

class PpiSegment : ModelVisual3D
{
MeshGeometry3D segmentMesh;
DiffuseMaterial segmentMaterial;

BitmapImage segmentTexture;
ImageSource segmentTextureSource;
ImageBrush segmentBrush;

// I get 3 points coordinates in the Constructor
public Segment(Point3D leftPoint, Point3D rightPoint, Point3D middlePoint)
{
segmentMesh = new MeshGeometry3D();
segmentMaterial = new DiffuseMaterial();

segmentTexture = new BitmapImage();
segmentBrush = new ImageBrush();

this.Content = new GeometryModel3D();
(this.Content as GeometryModel3D).Geometry = CreateTriangleCoords(leftPoint, rightPoint, middlePoint);

}

/* middle(center)
* /\
* / \
* / \
* / \
* left -------- right
*
*/
internal Geometry3D CreateTriangleCoords(Point3D leftPoint, Point3D rightPoint, Point3D middlePoint)
{

segmentMesh.Positions.Add(leftPoint);
segmentMesh.Normals.Add((Vector3D)leftPoint);
segmentMesh.TextureCoordinates.Add(new Point(1.0, 1.0));

segmentMesh.Positions.Add(rightPoint);
segmentMesh.Normals.Add((Vector3D)rightPoint);
segmentMesh.TextureCoordinates.Add(new Point(1.0, 1.0));

segmentMesh.Positions.Add(middlePoint);
segmentMesh.Normals.Add((Vector3D)middlePoint);
segmentMesh.TextureCoordinates.Add(new Point(0.0, 0.0));

segmentMesh.TriangleIndices.Add(2);
segmentMesh.TriangleIndices.Add(1);
segmentMesh.TriangleIndices.Add(0);

segmentMesh.Freeze();
return segmentMesh;
}
-----------------------------------------------------------------------------------------------------------
and now to the interresting part:
Here I am giving a BMP stream as an Image for the Brush.

//This Stream WAS INITIALIZED Before.
public Stream bitmapStream = new MemoryStream();

//On the first run of my class I call for this function to initialize the "StreamSource" parameter of
"segmentTexture"

public void SetTexture()
{

segmentTexture.BeginInit();
segmentTexture.StreamSource = bitmapStream;
segmentTexture.EndInit();

segmentTextureSource = segmentTexture;
segmentBrush.ImageSource = segmentTextureSource;
segmentMaterial.Brush = segmentBrush;

(this.Content as GeometryModel3D).Material = segmentMaterial;
this.Transform = new TranslateTransform3D(0.0, 0.0, 0.0);
}

Ok, I've got my image loaded. BUT! Now I need to change the image!
So I create somewhere a NEW stream and I amtrying to pass it like I did it before..

public void SetNewTexture(Stream newStream)
{

//I dont need Init/EndInit functions any more... (Don't I?)
segmentTexture.StreamSource = newStream;

segmentTextureSource = segmentTexture;
segmentBrush.ImageSource = segmentTextureSource;
segmentMaterial.Brush = segmentBrush;

(this.Content as GeometryModel3D).Material = segmentMaterial;
this.Transform = new TranslateTransform3D(0.0, 0.0, 0.0);
}

}

But! When I do that NOTHING happens... Image on my triangle primitive doesnt change...

-------------------------------------------------------------------------------------------------------------------------------

Here How I use my Segment class.. maybe its the problem....

class SegmentsBuilder
{
private ModelVisual3D _mv3D;
public PpiSegment[] segmentsArray;

//I am getting a "modelVisual3D" parameter from Window1.xaml
public SegmentsBuilder(ModelVisual3D modelVisual3D)
{
_mv3D = modelVisual3D;

segmentsArray = new PpiSegment[General.numberOfSegments];
}

//I am creating a circle from some number of triangles with textures on them
public void BuildSegments()
{
Point3D leftPoint, rightPoint, middlePoint;

double theta = MathHelper.DegToRad(360.0 / General.numberOfSegments);
double R = 0.95;
middlePoint = new Point3D(0.0, 0.0, General.ppiZCoordinate);

// create a list of triangles
for (int i = 0; i < General.numberOfBeems; i++)
{
//left
leftPoint = new Point3D();

leftPoint.X = R * Math.Cos((double)(i + 1) * theta);
leftPoint.Y = R * Math.Sin((double)(i + 1) * theta);
leftPoint.Z = General.ppiZCoordinate;

//right
rightPoint = new Point3D();

rightPoint.X = R * Math.Cos((double)(i) * theta);
rightPoint.Y = R * Math.Sin((double)(i) * theta);
rightPoint.Z = General.ppiZCoordinate;

segmentsArray[i] = new PpiSegment(rightPoint,leftPoint, middlePoint);
_mv3D.Children.Add(segmentsArray[i]);
}

}

public void UpdateTexture(int segment, Stream texture)
{

segmentsArray[segment].SetNewTexture(texture);

}

So here are my questions...
1)What do I do wrong? Why nothing happens over there?...
2)As I said before I am WPF noobie, so maybe there is another way of doing texture mapping, or doing my task (drawing a bitmap on the triangle)

Any help/ideas/opinions are really welcome... :]

Re: WPF and Texture mapping.. need some help =(

Insincere Dave21-Jul-08 7:39

Insincere Dave

21-Jul-08 7:39

Am I right in understanding that the bitmap was visible but did not change when you updated the bitmap?
I tried using a MemoryStream and only got it to change by recreating the BitmapDecoder and setting the ImageSource each time, even though it was set not to cache the result.
I also tried using WriteableBitmap in that case just changing the ImageSource on the ImageBrush was enough for it to update. The WriteableBitmap class is improved in 3.5 sp1 and allows access via pointers (don't for get to use AddDirtRect). You can also just write the whole array if you want.

If your not not updating the bitmap I may have misunderstood, if it doesn't show up at all I would check the texture coordinates and test by setting the BackMaterial to a SolidColor. You may also want to check if any of the materials, images e.t.c are Frozen.

Re: WPF and Texture mapping.. need some help =(

SilverD24-Jul-08 7:30

SilverD

24-Jul-08 7:30

thank you very much! You did understand me right, it just wasnt updating Smile | :)

The WriteableBitmap is the solution ;] Smile | :)

Read XAML file

Krishnraj18-Jul-08 21:56

Krishnraj

18-Jul-08 21:56

Hi all,

I m new to WPF. I m developing one application in which i want to read XAML file and iterate thru each control element and find the name and value of that control and write to another xml file.

So kindly need yr suggesion..

Thanks

Krishnraj

Re: Read XAML file

yanairon19-Jul-08 21:18

yanairon

19-Jul-08 21:18

the class XamlReader let's you read the root element from a xaml file (with Read method)
then you could iterate thru the logical tree using LogicalTreeHelper

Good Luck

Re: Read XAML file

Krishnraj20-Jul-08 19:06

Krishnraj

20-Jul-08 19:06

Hi yanairon,

Thank u very much for replying Smile | :)

OK Now i got the idea.

Again Thanks

Rana Krishnraj

How to set the startup object in WPF?

Michael Sync17-Jul-08 0:46

Re: How to set the startup object in WPF?

17-Jul-08 0:46

Hello,

I would like to set the object as a startup object in WPF. Normally, we used to use "this.StartupUri" for that. but I have to use the Uri of XAML file here. I don't like that. I want to set like this.Startup = new MyView(); in App.

Any idea?

Thanks in advance.

Edit: My WPF project should be XBAP-compatible. So, I can't use "Show()" or "Run()" method....

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

Wes Aday17-Jul-08 9:15

Wes Aday

17-Jul-08 9:15

Michael Sync wrote:
this.Startup = new MyView(); in App

Would the Application.MainWindow property work for you?

Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
Sometimes it takes a lot of work to be lazy
Individuality is fine, as long as we do it together - F. Burns

Re: How to set the startup object in WPF?

Michael Sync17-Jul-08 16:32