COMFILE Technology's Documentation Library

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====== Configure X11 Touchscreen Gestures ======

NOTE: The techniques and methods described below do not work in Wayland.

===== Installing the evdev Dependency =====


The following configurations require the evdev.  If it is not already installed, install it with ''sudo apt install xserver-xorg-input-evdev''.  For more information about the evdev options and their syntax please see the [[https://manpages.debian.org/stable/xserver-xorg-input-evdev/evdev.4.en.html|evdev manpage]] and the [[https://www.x.org/releases/current/doc/man/man5/xorg.conf.5.xhtml#heading9|InputClass configuration options]].


===== Add a long-touch right-click gesture =====

The following procedure will configure X Windows so a long-touch (touch and hold) will simulate a right-click and display a context menu.

  - Create the file ///etc/X11/xorg.conf.d/90-touch-gestures.conf// with the following contents:<code>
Section "InputClass"
    Identifier "touch gestures"
    Driver "evdev"
    MatchProduct "Microchip Technology Inc. AR1100 HID-MOUSE"
    Option "EmulateThirdButton" "1"
    Option "EmulateThirdButtonTimeout" "750"
    Option "EmulateThirdButtonMoveThreshold" "50"
EndSection
</code>
  - Reboot


{{ :comfilepi:right_click.mp4?600x338 |}}

In Mono applications, this feature can cause the MouseDown event to delay.  If your application depends on an immediate MouseDown event, please delete the file ///etc/X11/xorg.conf.d/90-right-click.conf//.

===== Add a touch-and-drag scroll gesture =====

The following procedure will configure X Windows so when you touch and drag your finger up and down the touchscreen it will scroll.

  - Create the file ///etc/X11/xorg.conf.d/90-touch-gestures.conf// with the following contents:<code>
Section "InputClass"
    Identifier "touch gestures"
    Driver "evdev"
    MatchProduct "Microchip Technology Inc. AR1100 HID-MOUSE"
    Option "EmulateWheel" "1"
    Option "EmulateWheelButton" "1"
    Option "EmulateWheelInertia" "10"
    Option "EmulateWheelTimeout" "200"
    Option "YAxisMapping" "4 5"
EndSection
</code>
  - Reboot

{{ :comfilepi:roll.mp4?600x338 |}}
<html><center><code>"EmulateWheelInertia" "10"</code></center></html>

{{ :comfilepi:drag.mp4?600x338 |}}
<html><center><code>"EmulateWheelInertia" "100"</code></center></html>

Use <html><code>Option "YAxisMapping" "5 4"</code></html> to invert the scroll direction.