Develop Reference

Auto scroll on Drag And Drop: UWP

I am developing UWP application. In one scenario, I am having multiple ListView on a canvas and I want to perform Drag and Drop between ListViews. While performing Drag-Drop scroller doesn't moves.
I tried to implement Behaviour defined in this Link. But it is not working as PreviewDragOver event is not available in UWP.
Is there any way to implement it ?

While PreviewDragOver is not available in UWP, the DragOver event definitely is. It seems it should be possible to use this event in the attached behavior instead.

WPF - Making DragDrop and ManipulationEnabled co-exist

I have a somewhat unusual design problem in a WPF touch application.
I have a UserControl that holds an image, which I allow the user to freely move, resize, and rotate around the touch surface using multitouch by setting:
isManipulationEnabled = true
and then hooking up events for ManipulationStarting, ManipulationDelta, and ManipulationCompleted.
This is all good and works perfectly, but now I would like to add the ability for a user to drag this control into the WrapPanel on another control, which has a list of image files, and add this image to the list.
I tried using DragDrop events by calling DragDrop.DoDragDrop() on the ManipulationDelta event, but it locks the UI and the control until a drop occurs, which is not what I want.
Is there any way to properly do this without writing my own hit-testing code? I'm using WPF 4.0 and .NET 4.5 on VS 2013, and I'm not sure if the Surface SDK would help me in this case (nor could I properly install/load it to VS2013)

Found my solution: Use VisualTreeHelper.HitTest and call the HitTest in the event handler for ManipulationDelta, and then use your own logic for handling the drag over operation. Use ManipulationCompleted event to check the hit test again to complete the drop

What is the difference between tap , mouse left button down and mouse pressed events?

Well, I am developing a windows phone app in c# and xaml.
I found these 3 events similar to each other.
the tap event, mouse left button down event and mouse pressed events.
Can anyone tell what exactly is the difference does these 3 events make when the phone is just a touch screen phone. What is unique difference between these 3 events ???..
Thanks..
If you down vote this question then tell atleast what is wrong in my question by comments..Sorry if this is too silly question.

This QuickStart Touch Input for Windows Phone page on MSDN, and this MouseLeftButtonUp Event page and this Mouse Position page explain the differences between the different events.
Basically, as per the links:
Tap
A finger touches the screen and releases.
MouseLeftButton
Is triggered in on finger release within the Tap event.
MousePressed
Mouse Pressed is the state of the tap while in Tap.
So the events are linked together of sorts. Someone with more experience with Windows Phone programming may be able to provide a better or more accurate explanation.

For all practical purposes, the Tap and Click events are equivalent for a Button.
The Click event was originally defined in Silverlight for desktop Windows and it is only defined for the Button control (and derivatives such as HyperlinkButton). You can think of the Click event as the "traditional" way to handle a Button press.
The Tap event was added to the framework in Windows Phone 7.1 (Mango). Tap is defined in the UIElement class, which is the parent of many types of controls. You can handle a Tap event in a TextBlock, Image, and many other controls. Button is subclassed from UIElement as well, and thus can also receive Tap events. It is redundant that a Button can receive both Tap and Click events.
reference
if u also read the second answer u can get some more info

mouse/tap events in Silverlight

I am using C#, Silverlight, WP7.
What is the difference between a Tap event and the sequence of MouseLeftButtonDown and MouseLeftButtonUp events? Also why doesn't a Tap event always trigger MouseLeftButtonDown/MouseLeftButtonUp in sequence? Are these events any different in simulation on the computer and deployed on a phone?
I can't find this in the documentation and my own tests seem to imply that a really quick click on the screen won't always generate a MouseLeftButtonDown/MouseLeftButtonUp sequence. Are these mutually exclusive events? If not, what is the order of events?
Thanks in advance.

Although the mouse events are available on WP7, they are not necessarily reliable.
User input in Windows Phone includes manipulation events, mouse
events, and touch events.
Manipulation events are the recommended way to handle user input. Unless you have a specific need, you should avoid using mouse events
in your Silverlight applications for Windows Phone for performance and
hardware compatibility reasons. Instead, you should use manipulation
events. You can also use Tap, DoubleTap, and Hold events on any
elements that derive from UIElement such as the base controls.
http://msdn.microsoft.com/en-us/library/ff967560%28v=VS.92%29.aspx

Wpf hosting windows form - mouse events not getting through

I've got a WPF app that has a WindowsFormsHost, which hosts a geobase map.
The problem I have is getting the mouse events through to the map. I've added MouseUp event handlers to the map (in code), but this does not work, and I've tried adding the MouseUp event handler on the Grid that contains the WindowsFormsHost, but the events are not picked up by this either.
I'm not sure whether this is a general WPF problem with the way I'm handling events, or a more specific problem that is specific to hosting Windows Forms apps in WPF...
Any pointers would be appreciated :)

As far as I understand you need to call WindowsFormsHost.EnableWindowsFormsInterop() for events to be forwarded to your winforms code.