In my 3d editor application, I want to be able to click on and move a scene's entities (meshes, lights, cameras, etc). To do that, I imagine that I need to get the current mouse position relative to my Direct3d view and somehow give it to my ViewModel. How would I go about doing that, considering that my app is built with the MVVM pattern?
Additional Info: The Direct3d renderer is from a C++ DLL and we're using an HwndHost to place it inside our WPF app. It has a WndProc which I imagine I could use to handle mouse messages there but I'd rather avoid it if at all possible.
Thanks!
The best solution I found is to use an attached behavior. In the control that serves as the placeholder to the HwndHost I set an attached property, like
b:MouseBehavior.LeftClick="{Binding DoSomeActionCommand}"
where MouseBehavior receives the control and sets mouse events on it.
It works well for me.
InputManager.Current.PrimaryMouseDevice is probably your best bet.
you can get the mouse position with
Mouse.Position( RelativeToObject ); // get the mouse pos relative to an object
Mouse.Position( null ); // get the mouse pos relative to the whole screen
if thats not good enough, you can use Win32 calls.
Related
I want to make a small box that will be visible after PointerEntered event on bing map. I need to get the position of pointer when the pointer is over the pushpin. Everything works but I can't get the position. I need it so I can dynamicly show the box in correct place near the pushpin.
How can I get cursor/pointer position ?
I don't think it's a good idea trying to rely too much on pointer position in Windows Store apps. Don't forget about your touch based users - how are you going to determine the pointer position in their case?
I haven't used Bing maps and pushpins in a Windows Store app yet, but maybe you could try using tooltips instead. They already have built-in support for both touch based and mouse based control and they even position themselves automatically in such a way that the user doesn't obsure them with his finger.
I am facing a problem that have kind of already been asked here before, as far as I have seen.
I read most of these but didn't find the right answer.
This is what I need:
Complex shaped zone (i.e: countries, states..)
Having possibility to get events on it (especially mouse's)
Possibility to place some conrols in it (i.e: images, buttons)
I saw that some uses usercontrols, controltemplates.. But how should I do for that kind of shape ? Most of questions was for some basic mix of standard shapes.
(I saw with Blend that we can make path object with a pen, is there a way to use this to define the shape of a zone ?)
Thanks.
Create your own control and have its main container be a Canvas. Have the canvas background be transparent and then you can place all the controls you want on it. You can use a Polygon as your main shape inside the Canvas and place all the controls you want on the Canvas (but I guess for your purpose, you would want to make sure to not place them outside of the area covered by the polygon.
Let each object you use handle the mousedown event then you can individually drag them. When mousedown occurs, use the CaptureMouse() method on the object you clicked so that all dragging (on or off of the main window) will still be captured by the object you clicked. Make sure to call ReleaseMouse() in the mouseup event.
You can create as many instances of your control as you need. All with different shapes defined by the polygon each one contains. You can slap all of these objects on a single grid or canvas, and you're good to go.
You can use the PathPanel class that is provided in the Expression Blend SDK.
More information here
I have some straight WPF 3.5 controls handling left mouse clicks that I need to use within a Surface app (SDK 1.0). The problem I am facing is that do not work by default. I am thinking of wrapping each control in a SurfaceContentControl and translating ContactTouchDown or ContactTapGesture events to corresponding MouseDown events.
The problem boils down to - how to "inject" or simulate arbitrary routed mouse events? I have tried InputManager.Current.ProcessInput() but didn't get very far. Any help is appreciated.
Try to use AutomationPeer classes. For example ButtonAutomationPeer is for Button. The code below initiates a click.
ButtonAutomationPeer peer = new ButtonAutomationPeer(button);
IInvokeProvider provider = (IInvokeProvider)peer.GetPattern(PatternInterface.Invoke);
provider.Invoke();
evpo's idea is an interesting one (though if you're working with custom controls, they rarely come with AutomationPeer classes).
You can't simply 'inject' mouse input by sending WM_MOUSE* events to your app... WPF would indeed process the message but when it goes to figure out the position of mouse for that event, it will query the actual mouse API instead of trying what you stick in the WM.
So really all you can do is tell windows to move the actual mouse cursor and act as though the button is being clicked/released. Some code you can use for that is in http://www.codeproject.com/KB/system/globalmousekeyboardlib.aspx
That said, while you can technically do this, it sucks... you've got an expensive multitouch device but are 1) showing a mouse cursor on it 2) limiting arbitrary parts of it to being used 'single touch' (and only one of those arbitrary parts at a time and 3) coming up with an arbitrary method of determining which finger you will treat as the mouse-controlling one
Is there a way to get mouse position without attaching a event handler?
I'm trying to get a box to appear where the mouse is.
Thanks
Sp
Wouldn't you rather want it on a mouse-up or mouse-down event? Here are a few drag-and-drop tutorials that might help with ideas for capturing mouse positions:
http://msdn.microsoft.com/en-us/library/cc189066%28vs.95%29.aspx
(SL 1, but still good) http://blogs.msdn.com/b/nickkramer/archive/2007/06/27/drag-drop-with-feedback.aspx
Unfortunately, I think you'll have no other way than using the MouseMove event. You can attach it to the Application.Current.RootVisual (or any other layout root) though, so you should be able to implement your scenario.
In my MVVM application, I have a Direct3d render window that shows a bunch of 3d meshes in a scene. In that render window, I want to be able to click on one of those 3d meshes in the scene and move it around, having it follow the mouse cursor. This is typical 3d editor stuff, moving a mesh along in screen space. So I need to be able to get the current mouse position, preferably relative to that Direct3d render window.
What's a method to do that?
Thanks!
Edit: Changing the wording since it was too generic and led to confusion.
InputManager.Current.PrimaryMouseDevice is probably your best bet.
Wrap it up in an interface that exposes the info you need and inject it using your favorite IoC framework.
I think this is the wrong way to think about the MVVM pattern. Let me illustrate this by changing your question slightly.
If you have some custom text editing control, what would be the best way to pass keystroke events to the ViewModel?
Wouldn't it be better to bind the the data to the control and then update the data through the binding as the control is manipulated?
So, you have a list of objects you want to show in a 3D view? Pass the objects as a they are, and use template binding to bind each object type to a DataTemplate describing the 3D object, which includes bindings to the X,Y,Z items in the object.
I would declare a delegate on the viewmodel and make the view register to it. this way the viewModel doesn't need to know about the view and is easy to unit test.