Is it possible for a UserControl to be transparent to mouse clicks/drags etc. and pass them to the control underneath it?
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I couldnt get the GotFocus() event fired in the WPF window by clicking. But if I click any controls, it will be fired.
My requirement is as follows: I have a hostwindow which has a viewport with two datagrids which can host user controls. I do animations like flip and fade on this user controls. I am using a transparent background(glass effect) for the controls. But when one user control get on top of the other, both of them overlap. So I want to make the top one opaque when the user click on one user control.
Try using the Activated event, as GotFocus is intended to be used only with controls.
I have an user control with elements inside. And this User control displays in popup window. I should hide popup window when user mouse leave from popup, so I should catch mouse leave from elements on user control. How to do it?
I have a silverlight templated control that changes opacity when you hover it . However when user points cursor to its child control the effect wores off. I want to have the control highlighted also when the user hovers any child control. I've did the same thing in WinForms by overriding the WndProc method. Is there something similar in silverlight ?
Thanks
Sounds to me like you have not used the correct events to detect the hover, I suspect you are using MouseMove. Instead Use MouseEnter and MouseLeave events. An MouseEnter event will occur when the mouse moves over the control. You move the mouse over child controls and you will get no further events. Then when the mouse moves completely out of your control you will get MouseLeave.
I'm writing an XBAP with a complex Popup (Canvas Z-index of 99 with a grid on it...) that I would like to "attach" to the button that opens it and follow that button around wherever it goes on the screen. For example, if the button is in a ListBox or an XamDataGrid I would like the popup to follow the button as it scrolls through. If it is beneath an Expander I want it to stay attached to the button when the expander forces it to move, etc.
Any Ideas?
When using a Popup, neither PlacementTarget nor CustomPopupPlacementCallback is used after the popup has originally appeared. So any use of these properties will not allow the popup to track the button as it moves.
Several ways occur to me of achieving what you desire:
Attach a custom Adorner to the button and put the popup inside it. Disadvantage: Popup is not connected to Button or surrounding elements, so it won't inherit properties & DataContext from them.
Attach a custom Adorner to the button. This adorner will get measure and arrange calls when the button moves relative to the AdornerLayer, allowing you to manually update the Popup position. As long as your AdornerDecorator doesn't move relative to your Window (eg if it is the direct child of the Window), you can easily detect the AdornerLayer being moved by monitoring changes to Window size. Disadvantage: Complex to code & get right.
Don't use a Popup at all. Instead wrap the button in a <Grid> alongside a <Canvas> with zero width and height and the desired position. Inside the <Canvas> add the UserControl for the popup with an appropriate ZIndex. It will extend past the edge f the Canvas, which is just fine in WPF. Instead of using a Popup control just control the visibility of the UserControl. Disadvantage: Will not really be totally on top of all other objects, can't extend off edge of window (may not be an issue for XBAP, though).
I'm not sure if it will auto-update for you or not, but the PlacementTarget property allows you to specify a control to position the popup relative to. If that doesn't work, then maybe CustomPopupPlacementCallback will do the trick?
How can I get a UIElement to ignore mouse clicks on it and pass it through to the control behind it?
I have a 50% transparent UIElement which covers another element. When I attempt to click on the background element, the mouse click is captured by the foreground semi-transparent UIElement.
Set IsHitTestVisible=false