WPF Discussion Boards

31-Mar-09 4:27

Stephen - you may want to take a look at the options that Pavan has put together in Fluidkit[^]. This is probably what you want.

"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: Change Visibilty of a Row in Grid

Re: WPF 3D help needed

Stevie31-Mar-09 5:12

Stevie

31-Mar-09 5:12

Thank you for pointing out fluid! Looks promising.

Actually I was looking for a XAML snippet like handling two / three images in a Viewport3D view. Maybe any other documents/HowTos?

Best regards and thank's again!

Stevie

[Message Deleted]

Prajeesh31-Mar-09 3:00

Prajeesh

31-Mar-09 3:00

[Message Deleted]

Pete O'Hanlon31-Mar-09 4:50

31-Mar-09 4:50

You could always use a method like this:

private void ChangeRowHeight(Grid grid, int row, int height)
{
    grid.RowDefinitions[row].Height = new GridLength(height);
}

So, to hide the 2nd row, you'd use

ChangeRowHeight(Details, 1, 0);

"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.

Direct3D always on the top? [modified]

mildred-frontfree30-Mar-09 15:38

mildred-frontfree

30-Mar-09 15:38

I've got a 3D Control which based On Direct3D. And I found something interesting. In my window, I have a Grid as a root element which holds two children, the first one is my 3D contorl and another one is a rectangle.
<grid>
<mycontrol:3dcontrol xmlns:mycontrol="#unknown" />
<rectangle width="50">
Height="50"
Fill="Red"/>
</rectangle></grid>
I hope, as well as it seems to be,the Rectangle is on top of my 3DControl. But on the opposite, 3DControl is on the top of my rectangle.
Then I tried to set the Panel.ZIndex neither it work. Since many ways I've tried it still doesn't work, I started to judge the way of wpf d3d control mechainsm.
In some articles I learned Direct3D has two modes windowed and exclusive. Windowed needs back buffer bu Exclusive calls graphic driver directly. Is the Exclusive mode make my 3DControl always on the top? Oh by the way, mycontrol is inherited from WindowsFormHost class, is it caused the promblem either? Anyway so confused!!!!

modified on Tuesday, March 31, 2009 1:20 AM

MVVM - how to update a control in a WindowsFormsHost

barker77030-Mar-09 12:52

Re: MVVM - how to update a control in a WindowsFormsHost

30-Mar-09 12:52

I'm using MVVM in which WPF controls are data bound to propertied in a "ViewModel". This all works fine. One of our main controls is an XY chart and it can only be update via code because it requires looping and other logic. i.e it's not adaptable to data binding.

Since I cannot bind the chart to data, I was forced to add a method to the XAML code behind that knows how to update the chart. To further muddy the MVVM design pattern, I had to pass the View down to the ViewModel, so that the ViewModel could explicitly call the UpdateChart method that is in the View code behind.

Instead of binding between the ViewModel and UI control, I would like to bind between the ViewModel and a method in the code behind. Then the method in the code behind could go thru its complex logic to update the chart control.

Thanks for any suggestions. I appreciate the benfits of DataBinding and MVVM, but I can't make it work with my WinForms control that is embedded in a WindowsFormsHost control.

Mitch

ABitSmart30-Mar-09 19:38

ABitSmart

30-Mar-09 19:38

barker770 wrote:
pass the View down to the ViewModel

why would you do that ? You could bind in the view to change notification and update whenever there is a change?

Re: MVVM - how to update a control in a WindowsFormsHost

barker77031-Mar-09 11:00

Re: MVVM - how to update a control in a WindowsFormsHost

31-Mar-09 11:00

ABitSmart wrote:
why would you do that ? You could bind in the view to change notification and update whenever there is a change?

The view is bound to the view model, and I have implemented INotifyChange. This works for binding to WPF controls, but not for binding to my chart control that is in the WinFormsHost.

So the question remains, can I bind a method in my View to the ViewModel without explicitly passing the view object down to the viewModel object.

Mitch

Pete O'Hanlon30-Mar-09 21:52

30-Mar-09 21:52

barker770 wrote:
Since I cannot bind the chart to data, I was forced to add a method to the XAML code behind that knows how to update the chart. To further muddy the MVVM design pattern, I had to pass the View down to the ViewModel, so that the ViewModel could explicitly call the UpdateChart method that is in the View code behind.

Why is this method not part of the ViewModel? If it's updating data, then it has no place in the view - the view should only be a visual representation.

"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: MVVM - how to update a control in a WindowsFormsHost

barker77031-Mar-09 10:56

Re: MVVM - how to update a control in a WindowsFormsHost

31-Mar-09 10:56

> Why is this method not part of the ViewModel? If it's updating data,
> then it has no place in the view - the view should only be a visual
> representation.

Agreed. And the procedural code in the View.xaml.cs code is really just to help transfer the data into the winforms control.

Yes, I would prefer to bind a chart property directly to a method in the ViewModel, but I need this procedural code to be somewhere. And it makes sense to make it part of the View. Just as somewhere in the standard WPF binding code there is some procedural code that does the actual display of the data.

It would be perfect if I could bind a method in the View.xaml.cs to my ViewModel In effect, encapsulating the logic needed to bind to the chart control inside the View (albeit the code behind for the View.

Mitch

Pete O'Hanlon31-Mar-09 11:56

31-Mar-09 11:56

If you just need to use the host because you have a none WPF chart, why not take a look at this[^]?

"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: MVVM - how to update a control in a WindowsFormsHost

barker7701-Apr-09 4:31

Re: MVVM - how to update a control in a WindowsFormsHost

1-Apr-09 4:31

A native chart is of course the best solution. However, we have a lot of expertise with this third party chart control (ChartFx) that it would be too costly in terms of time to abandon it now. We have several WinForms products and we have layered on many custom interactive chart features. We're starting a new product and want to use WPF for all but the chart.

ChartFx is developing a WPF native chart, but it may not have the same feature set nor does it's release schedule match ours.

Anyway, I did find the "PropertyMap" property of the WinFormsHost, but it only maps to properties of the winForms host class. Is there some way to add a new property? For example, I would map a new property named "DataSeries" to a method in the xaml.cs code. Then I would bind the "DataSeries" property to my ViewModel. Any tips on doing this?

Thanks,

Mitch

barker7701-Apr-09 9:11

Re: MVVM - how to update a control in a WindowsFormsHost

1-Apr-09 9:11

I think I answered my own question. Since the ViewModel implemented INotifyChangedProperty I just added an event handler in the view's code behind to listen for each event from the viewModel. When it's the even I want, I update the winforms chart.

This pseudo binding still relies on both the View and ViewModel to agree on a property name. But that's the nature of binding anyway.

Mitch

Pete O'Hanlon1-Apr-09 9:22

1-Apr-09 9:22

Congratulations. It's just a shame you've had to use the Interop Helpers; they are such a bind. Pun unintended.

"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.