avalonia-input-interaction

Avalonia Input & Interaction

Overview

All input routes as routed events (bubbling by default, tunneling with "Preview" prefix). Pointer events are unified across mouse, touch, and stylus.

Pointer Events

Event	Fires when
PointerPressed	Button/finger down
PointerReleased	Button/finger up
PointerMoved	Pointer moves over control
PointerEntered	Pointer enters bounds
PointerExited	Pointer leaves bounds
PointerCaptureLost	Capture released
Tapped	Quick tap/click
DoubleTapped	Double tap/click
RightTapped	Right-click / long press

myControl.PointerPressed += (s, e) =>
{
    var point = e.GetPosition(myControl);
    var props = e.GetCurrentPoint(myControl).Properties;
    if (props.IsLeftButtonPressed) { /* left click */ }
    if (props.IsRightButtonPressed) { /* right click */ }
    if (props.IsMiddleButtonPressed) { /* middle click */ }
};

Capture pointer (receive events outside bounds):

myControl.PointerPressed += (s, e) =>
{
    e.Pointer.Capture(myControl);
};
myControl.PointerReleased += (s, e) =>
{
    e.Pointer.Capture(null); // release
};

Check pointer type:

myControl.PointerPressed += (s, e) =>
{
    if (e.Pointer.Type == PointerType.Touch) { /* touch */ }
    if (e.Pointer.Type == PointerType.Pen) { /* stylus */ }
};

Keyboard Events

Event	Fires when
KeyDown	Key pressed (repeats while held)
KeyUp	Key released
TextInput	Text character produced

myControl.KeyDown += (s, e) =>
{
    if (e.Key == Key.Enter && e.KeyModifiers == KeyModifiers.Control)
    {
        e.Handled = true; // stop bubbling + prevent default
        SubmitForm();
    }
};

myTextBox.TextInput += (s, e) =>
{
    if (!char.IsDigit(e.Text![0]))
        e.Handled = true; // block non-digit input
};

KeyModifiers flags: None, Alt, Control, Shift, Meta (combinable with |)

// Ctrl+Shift+Z
if (e.Key == Key.Z && e.KeyModifiers == (KeyModifiers.Control | KeyModifiers.Shift))