Drag drop preview - WPF Discussion Boards

Pete O'Hanlon24-Mar-09 11:20

24-Mar-09 11:20

You need to add this into your XAML to use the WordTypeTemplateSelector:

xmlns:local="clr-namespace:AnagramsWPF"

If it's already present, build your application - this type of reference only works if there are no build errors that prevent that class being updated. I'm busy writing a WPFified version of CPAM and this might help to clarify things for you.

"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.

#realJSOP25-Mar-09 3:29

#realJSOP

25-Mar-09 3:29

Well, I got it to work, but it was a royal pain in the ass. It was a LOT simpler in WinForms.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Pete O'Hanlon25-Mar-09 3:44

25-Mar-09 3:44

Congratulations.

"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: Load project into canvas

RugbyLeague30-Mar-09 3:51

RugbyLeague

30-Mar-09 3:51

I have to say I feel exactly the same. WPF is killing me - stuff which used to take a few lines of code can now take 100s of lines of code - even right aligning text in a listview is a pain and completely unobvious.

I used to spend about 20% of the time on the GUI and 80% on what the app actually did - that is now something like 50/50 and much of the WPF stuff is still a complete mystery - I used to be able to figure out most stuff for myself but now it's just lots of googling and hacking about with the answers I find until something looks similar to what I intended.

After all that the end product looks awful and is so slow on some PCs it's almost unusable. I have won industry awards for software written using Winforms - I won't be winning any using WPF.

Load project into canvas

emptythetill23-Mar-09 10:55

emptythetill

23-Mar-09 10:55

Hello.

I'm working on an interface/front end for an application, my friend is working on the other half of the app which actually does the work. We're using this as a system to learn WPF better.

Anyhow, I have a canvas put aside which we wish to load his content into, but we can't figure out how. I've read that to load XAML into a Canvas you first need to parse it to a visual object, does this sound correct? Also, would it be easier if he created a user control which we could load into the canvas?

Regards, E.

Christian Graus23-Mar-09 15:21

Christian Graus

23-Mar-09 15:21

What form will his project come in ? Why can't you just inject his XAML into your project, verbatim ?

Yes, having him create user controls seems like a good way for you to reuse them.

Christian Graus

Driven to the arms of OSX by Vista.

Re: Load project into canvas

emptythetill24-Mar-09 7:41

emptythetill

24-Mar-09 7:41

Hello.

His project is a standard WPF app, a single XAML with code behind and an extra class to handle some more complex math.

He's created his app at a specific size, my app has a 'hole' in it the same size, currently filled by a canvas. I was wondering if I could load his XAML into the canvas?

Regards, E.

Drag drop preview

anishkannan23-Mar-09 0:54

anishkannan

23-Mar-09 0:54

Hi
I m beginner in wpf application
Now i did the drag and drop using dependency property
The GUI class name is "Window1" but my drag and drop callback
method in "class1" class. The drag and drop are perfectly working
( Label drag and drop the the Uniform grid)

But now i need the label image (means the label preview) also
come with the mouse, when drag and drop. How we do this in Class1.

Then another one, the UniformGrid have 3 cell (for example).
Now want drag and drop the 3rd cell how can identify that cell
( if any build in methodology )

Then i want label drag over the first cell means that label image
visible in the first cell,

Please Help me.

Thank You

modified on Monday, March 23, 2009 7:04 AM

Re: Drag drop preview [modified]

sivaddrahcir23-Mar-09 11:45

sivaddrahcir

23-Mar-09 11:45

Let me see if I understand the question. You have drag and drop working fine with a UniformGrid but need to drag and drop between cells in the UniformGrid and show visual feedback. Is that correct?

I found this blog post by Jaime Rodriguez helpful:
http://blogs.msdn.com/jaimer/archive/2007/07/12/drag-drop-in-wpf-explained-end-to-end.aspx[^]

Blog:
http://windowsclientdevelopment.spaces.live.com
FAQs:
http://windowspresentationfoundation.wikispaces.com
http://windowsmobile.wikispaces.com
http://vsto.wikispaces.com

Downloading file from server

sumit703422-Mar-09 23:50

sumit7034

22-Mar-09 23:50

hi I want to download file from the server. For this purpose i created a web service which returns a byte array of file. On silverlight page.xaml i got the byte array but how can i convert it to file so that i can save file to client hard disk.
If there is any other way to download file from server plz tell me.

Thanks in advance.

Re: Downloading file from server

Mark Salsbery23-Mar-09 9:51

Mark Salsbery

23-Mar-09 9:51

In Silverlight 2, the only access you have to the user's local hard disk
is using Isolated Storage:

Silverlight Isolated Storage[^]

Silverlight 3, now in beta, provides a save-file dialog that will allow the user
to select a place you can save the file to. Note that this will still require user
interaction - you won't be able to just write anywhere you want to.

Mark

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

Re: Downloading file from server

sumit703423-Mar-09 18:59

sumit7034

23-Mar-09 18:59

Thanks

Re: Downloading file from server

Braulio Dez1-Apr-09 5:58

Braulio Dez

1-Apr-09 5:58

You can do it using a trick.

Instead of calling the web service, from Silverlight call javascript method that will make an open to a given URL, this URL will point to a custom HTTP handler, then you return your file (implementing a custom HTTP handler it's easy can send you some info or link), you only has to say that the file is an attachment.

In my case I just render e jpeg, js:

function showReportDiagramPopup() {
//http: //www.javascripter.net/faq/openinga.htm
window.open("DiagramRenderPopup.aspx", "DatabaseDiagram", "scrollbars=yes, width=800,height=600", false);

// NOT IN USE, rather using popup
// Finally we are not going to use a popup, we just open the generated image as an attachment
//window.location = "DiagramImageHandler.ashx"

}

In Silverlight:

public void ShowDiagramImageRenderPopup()
{
System.Windows.Browser.HtmlPage.Window.CreateInstance("showReportDiagramPopup");
}

HTH
Braulio

/// -------------------------
     Braulio Díez

     DBSchemaEditor.com
     Free Silverlight based DB Schema Modeling Tool
/// -------------------------

RoutedEvent compare to event?

mildred-frontfree22-Mar-09 23:34

mildred-frontfree

22-Mar-09 23:34

It seems that RoutedEvent is quite similar with event. Is it true that we can do anything by event instead of RoutedEvent? If it is true, what is the advantage of RoutedEvent?

ABitSmart23-Mar-09 0:04

23-Mar-09 0:04

mildred-frontfree wrote:
It seems that RoutedEvent is quite similar with event.

Which "event" are you referring to ?

Routed events are very powerful UI events. They are flexible enough to be placed at any place in the Element tree and handled by any other element. You can have a set of buttons and all the clicks handled at a common root. Also, there are scenarios like EventTriggers in XAML which only work with Routed events.

More information here[^]

mildred-frontfree23-Mar-09 0:24

mildred-frontfree

23-Mar-09 0:24

Well, let me explain myself a little bit clear. On msdn there is a example like this.

<br />
public class MyButtonSimple: Button<br />
{<br />
    // Create a custom routed event by first registering a RoutedEventID<br />
    // This event uses the bubbling routing strategy<br />
    public static readonly RoutedEvent TapEvent = EventManager.RegisterRoutedEvent(<br />
        "Tap", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(MyButtonSimple));<br />
<br />
    // Provide CLR accessors for the event<br />
    public event RoutedEventHandler Tap<br />
    {<br />
            add { AddHandler(TapEvent, value); } <br />
            remove { RemoveHandler(TapEvent, value); }<br />
    }<br />
<br />
    // This method raises the Tap event<br />
    void RaiseTapEvent()<br />
    {<br />
            RoutedEventArgs newEventArgs = new RoutedEventArgs(MyButtonSimple.TapEvent);<br />
            RaiseEvent(newEventArgs);<br />
    }<br />
    // For demonstration purposes we raise the event when the MyButtonSimple is clicked<br />
    protected override void OnClick()<br />
    {<br />
        RaiseTapEvent();<br />
    }<br />
<br />
}<br />
<br />
<br />

But, from my point of view, I could although done it this way

<br />
public delegate void DelegateClickEventHandler();<br />
public event DelegateClickEventHandler DelegateClickEvent;<br />
<br />
protected ovveride void OnClick()<br />
{<br />
   if(DelegateClickEvent!=null)<br />
   {<br />
       DelegateClickEvent();<br />
   }<br />
}<br />

And I could use this event in XAML either. So i am a little confused.

Pete O'Hanlon23-Mar-09 1:00

23-Mar-09 1:00

Routed events, cunningly enough, are designed to support event routing. Basically this mechanism allows you to register an event inside one element but, and this is the clever part, it can be raised by a completely different element. A simple example (and commonly quoted) is that a toolbar button click can go through the toolbar, then maybe a toolbar container, before finally being handled by your code. As you can see, this goes way beyond what you can manage with a simple event because the event would not bubble up in a traditional event scenario.

The problem you have here, is that the example on MSDN isn't terribly well explained, and the concept isn't clearly defined on the MSDN either.

"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.

ABitSmart23-Mar-09 1:29

23-Mar-09 1:29

That was nicely explained Smile | :)

That example on MSDN is pathetic and is more misleading than helping. When you read the explanation you somewhat get the picture but when you reach the example, it totally leaves you guessing into the behavior as of a normal event.

Pete O'Hanlon23-Mar-09 2:50

23-Mar-09 2:50

ABitSmart wrote:
That was nicely explained

Thanks.

ABitSmart wrote:
That example on MSDN is pathetic and is more misleading than helping.

Isn't it just? I really wish they'd up the quality of samples on MSDN. I used to rely heavily on MSDN - now, I tend to ignore it.

"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.

ABitSmart23-Mar-09 2:56

23-Mar-09 2:56

It doesn't matter anymore. My MSDN is Josh, Sacha, Karl, Dr.WPF and Pete[^] Smile | :)

The WPF disciples are fabulous!

Pete O'Hanlon23-Mar-09 3:08

23-Mar-09 3:08

Thanks - it's an honour to be among such giants, and the Disciples are as fine a bunch as you'll ever meet.

"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.

ABitSmart23-Mar-09 1:24

23-Mar-09 1:24

Pete gave a nice explanation. Just to highlight, the Tap event of your example could be handled by any other UI element in the Element tree instead of your Element. Also, could be used as an EventTrigger to start an animations when the event is fired. You can derive the analogy on similar lines as a CLR property and a Dependency Property.