Does anyone know how I can implement a single Touch Event. A simple, one finger touch event, not multiple gesture or anything... Just a simple one finger touch.
I want to learn how to do this instead of doing LeftButtonMouseUp.
Add this to any control:
XAML
Tap="Control_Tap"
CodeBehind
private void Control_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
// Tap Logic
}
Here is a link to the Gesture cheat sheet
Related
Is there a way to distinguish whether a button was clicked as in with a mouse or touched using a touchscreen in WPF?
You can subscribe to PreviewMouseDown and PreviewTouchDown.
Page.xaml
<Button PreviewMouseDown="Button_PreviewMouseDown"
PreviewTouchDown="Button_PreviewTouchDown" />
Page.xaml.cs
private void Button_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
MessageBox.Show("Mouse was used.");
}
private void Button_PreviewTouchDown(object sender, TouchEventArgs e)
{
MessageBox.Show("Touchscreen was used.");
}
I don't believe you'll be able to access the eventargs of either in the actual click event.
If you need to perform work there as opposed to the preview events I would recommend setting an instance variable in the preview events so when you get to the click event you know where you came from.
You have to set up an event handler. In the designer, double click on the button and that will set on up for you.
Then in the code behind add what ever code you want.
private void Button_Click(object sender, RoutedEventArgs e)
{
this.Title = "Clicked";
}
You can add Touch events as well TouchDown, TouchUp, etc.
Windows 7 and its higher versions have the ability to receive input from multiple touch-sensitive devices. WPF applications can also handle touch input as other input, such as the mouse or keyboard, by raising events when a touch occurs.
WPF exposes two types of events when a touch occurs − touch events and manipulation events. Touch events provide raw data about each finger on a touchscreen and its movement. Manipulation events interpret the input as certain actions. Both types of events are discussed in this section.
WPF enables applications to respond to touch. For example, you can interact with an application by using one or more fingers on a touch-sensitive device, such as a touchscreen This walkthrough creates an application that enables the user to move, resize, or rotate a single object by using touch.
Source MSDN : https://msdn.microsoft.com/en-us/library/ee649090.aspx
Also read this codeproject article - http://www.codeproject.com/Articles/692286/WPF-and-multi-touch
Is there a way to create global keys in Silverlight? I added a KeyDown event handler to the topmost Page element. I can catch the key signal when elements like a Button, TextBox, Calendar, and RichTextBox have focus. But the DatePicker won't let me handle the key down event at the Page level. Any way to make a hotkey in non-OOB SL?
P.S. I am assuming that the DatePicker control behaves differently than others as it is still in the Silverlight Toolkit.
have you tried using the AddHandler method? With this method you can add a handler and define if you want to handle already handled events, too.
In my simple example I added it to the RootVisual in the app.xaml.cs.
private void Application_Startup(object sender, StartupEventArgs e)
{
this.RootVisual = new MainPage();
RootVisual.AddHandler(UIElement.KeyDownEvent, new KeyEventHandler(HandleKeyDown), true);
}
private void HandleKeyDown(object sender, KeyEventArgs e)
{
//Add your keyhandling code here
Debug.WriteLine(e.Key);
}
I tried it with a DatePicker and it works.
Hope this helps!
BR,
TJ
This may help you. The author provides two ways using HTML bridge (when your Silverlight does not have focus) and using the KeyUp event on Application.RootVisual.
I have not tried it myself so I wouldn't know if it's working.
I have a WPF 4 application where I have implemented Drag and Drop using the standard DragDrop.DoDragDrop approach, but Im doing it using touch instead of Mouse events.
My XAML for my Grid (that Im dragging) is as follows:
<Grid x:Name="LayoutRoot"
ManipulationStarting="ManipulationStarting"
ManipulationDelta="ManipulationDelta"
ManipulationCompleted="ManipulationCompleted"
IsManipulationEnabled="True">
<!-- children in here -->
</Grid>
Now the code behind is like this:
private void ManipulationStarting(object sender, ManipulationStartingEventArgs e)
{
e.ManipulationContainer = this;
e.Handled = true;
}
private void ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
e.Handled = true;
DragDrop.DoDragDrop(this, new DataObject(GetType(), this), DragDropEffects.Move);
}
private void ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
{
//completed stuff
}
BUT when I try to drag with one finger while already dragging with another finger (different hands for example, which would simulate two people) the second touches don't seem to register properly, infact, it seems that windows thinks that my two fingers are trying to scale (like a pinch gesture)...
Does anyone know a way to get around this?
Thanks a lot
Mark
For multi-touch, you're going to want to use the Surface Toolkit for Windows Touch. It includes a drag-and-drop framework suitable for multi-touch scenarios. It includes a drag-and-drop framework. That link includes several how-to scenarios.
Although this is just an educated guess, I would say that DragDrop.DoDragDrop() is not capable to handle multiple drag guestures in parallel.
Indices:
There's no possibility to pass a touch ID to the method (which would be neccessary for differentiating the ongoing drag gestures)
The implementation of DoDragDrop() is static
The call of DoDragDrop() is blocking until the drop occured or was canceled
It is based upon the OLE version of drag and drop (which was not updated for Win7)
However, I would be glad if someone could correct me in this matter, because I'm currently also searching an DND API suitable for touch support.
Regards,
Seven
I have a problem using custom made UserControl in Silverlight Page.
The UserControl is generally a rectangle containing a smaller rectangle inside.
I want to use the UControl in a Silverlight MainSite.
i've implemented a method on mouse button down for a smaller rectangle called in here Button1:
public void Button1_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
MessageBox.Show("Hello");
}
How can i use it from a MainSite? From there I can only implement a method like:
private void ImportedControl_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
firstLeaf.Button1_MouseLeftButtonDown(sender, e);
}
I can not implement a method for Button1.
How can i mek this Work?
HELP:)
I am still not sure I understand the question, but let me take a swing at an answer. Why don't you use a real Button and just template it with a rectangle? This way you get all the benefits of actually having a button while having it look like a rectangle, including the Click event.
Here is a post Scott Guthrie did on control templating with a button.
I am new to silverlight - I've seen the tutorials and all, what I am looking for are high-level steps required to implement drag&drop and maybe a bit of (pseudo)code just to get an idea.
Any help appreciated!
Could you explain exactly what you would like to achieve with drag and drop in Silverlight? The top answer in the question that you linked to links to this page:
http://www.adefwebserver.com/DotNetNukeHELP/Misc/Silverlight/DragAndDropTest/
This contains a sample project with source that implements drag and drop (coincidentally, based on a sample I made for beta 1 of Silverlight 2 :-) ). What about this code is not suitable for your needs?
EDIT:
The basic skeleton of a drag and drop implementation would look like:
bool isDragging = false;
void elementMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (element.CaptureMouse())
{
isDragging = true;
element.MouseMove += elementMouseMove;
//start drag code goes here
}
}
void elementMouseMove(object sender, MouseEventArgs e)
{
//Drag code goes here
}
void element_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (isDragging)
{
element.ReleaseMouseCapture();
isDragging = false;
element.MouseMove -= elementMouseMove;
//Drop code goes here
}
}
Add the MouseLeftButtonUp/Down handlers to the element that you want to drag.
In the MouseMove event handler, add the code that you want to execute during the drag: e.g. change Canvas.Top and Canvas.Left to match the mouse position. You can get the mouse position from the event args. You would probably want to get the position relative to the elements container.
In the MouseLeftButtonUp event handler, add the code that would execute when the "drop" occurs. For example, you might want to implement a "recycle bin" that elements can be dragged to. In that case, you would want to know what elements are underneath the mouse at the point of the drop. You can use VisualTreeHelper.FindElementsAtHostCoordinates, passing the mouse position relative to the application's root (use e.GetPosition(null)). Then if your "recycle bin" element is returned by FindElementsInHostCoordinates you know to execute the appropriate action.
Does this help answer you question?
isn't MouseLeftButtonDown where you are supposed to be starting the capture, not on mouseleftbuttonup?