Pi3B, Mate, Touch Screen - where is context menu?

Support & Help Requests Raspberry Pi
#1

I am running Ubuntu Mate on a Raspberry Pi, version 16.04.02, using a touchscreen monitor (Dell S2240T), and generally it works great. I can even get some multi-touch gestures to work.

However, I cannot find a viable solution for right-cllick (Context menu).

With OnBoard (which I am also using) I can toggle on the mouse click pointers, and get a context menu to appear just fine in that way, so the context menus themselves are working.

I read in many places it is a long touch, but a long touch does nothing as best I can tell. Even very long. And since drags and similar work, I think the actual gestures on the screen are functioning (i.e. it can tell I’m still touching it).

Is there a setting to enable it? I went through the various accessibility options and nothing jumps out.

Some things just do not work without a context menu, and as this is a music display on a grand piano, a mouse is a tad out of place.

Thanks in advance for any pointers,

Linwood Ferguson

#2

I have been working on this continuously without progress, so hope someone has suggestions, but I thought I would post what I have tried.

Everything I read indicates that the key is in adding:

    Option "EmulateThirdButton" "true"
    Option "EmulateThirdButtonTimeout" "750"
    Option "EmulateThirdButtonMoveThreshold" "50"

to the 10-evdev.conf file (or somewhere in the xorg.conf path – not too worried if this is the ideal play but it is a place that is being called).

I added this to the existing “InputClass” definition that is the catchall for driver evdev for touchscreens. I have also tried setting up a separate section just matching this type.

The Xorg.0.log file shows that it is being seen. It shows:

[    12.599] (**) Option "xkb_layout" "us"
[    12.607] (II) config/udev: Adding input device Weida Hi-Tech                CoolTouch  System            (/dev/input/event1)
[    12.607] (**) Weida Hi-Tech                CoolTouch System           : Applying InputClass "evdev touchscreen catchall"
[    12.607] (II) Using input driver 'evdev' for 'Weida Hi-Tech                CoolTouch System           '
[    12.607] (**) Weida Hi-Tech                CoolTouch System           : always reports core events
[    12.607] (**) evdev: Weida Hi-Tech                CoolTouch System           : Device: "/dev/input/event1"
[    12.608] (--) evdev: Weida Hi-Tech                CoolTouch System           : Vendor 0x2575 Product 0x8753
[    12.608] (--) evdev: Weida Hi-Tech                CoolTouch System           : Found absolute axes
[    12.608] (--) evdev: Weida Hi-Tech                CoolTouch System           : Found absolute multitouch axes
[    12.608] (II) evdev: Weida Hi-Tech                CoolTouch System           : No buttons found, faking one.
[    12.608] (--) evdev: Weida Hi-Tech                CoolTouch System           : Found x and y absolute axes
[    12.608] (--) evdev: Weida Hi-Tech                CoolTouch System           : Found absolute touchscreen
[    12.608] (II) evdev: Weida Hi-Tech                CoolTouch System           : Configuring as touchscreen
[    12.608] (**) Option "EmulateThirdButton" "true"
[    12.608] (**) Option "EmulateThirdButtonTimeout" "750"
[    12.608] (**) Option "EmulateThirdButtonMoveThreshold" "50"
[    12.609] (**) evdev: Weida Hi-Tech                CoolTouch System           : YAxisMapping: buttons 4 and 5
[    12.609] (**) evdev: Weida Hi-Tech                CoolTouch System           : EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[    12.609] (**) Option "config_info" "udev:/sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.0/0003:2575:8753.0001/input/input1/event1"
[    12.609] (II) XINPUT: Adding extended input device "Weida Hi-Tech                CoolTouch System           " (type: TOUCHSCREEN, id 7)
[    12.609] (II) evdev: Weida Hi-Tech                CoolTouch System           : initialized for absolute axes.
[    12.611] (**) Weida Hi-Tech                CoolTouch System           : (accel) keeping acceleration scheme 1
[    12.611] (**) Weida Hi-Tech                CoolTouch System           : (accel) acceleration profile 0
[    12.611] (**) Weida Hi-Tech                CoolTouch System           : (accel) acceleration factor: 2.000
[    12.611] (**) Weida Hi-Tech                CoolTouch System           : (accel) acceleration threshold: 4
[    12.615] (II) config/udev: Adding input device Weida Hi-Tech                CoolTouch System            (/dev/input/mouse0)
[    12.615] (II) No input driver specified, ignoring this device.
[    12.615] (II) This device may have been added with another device file.

It looks to me as though it is seeing and honoring the right mouse setup. If I do a xinput list-props, I get:

    Device 'Weida Hi-Tech                CoolTouch System           ':
    Device Enabled (116):   1
    Coordinate Transformation Matrix (117): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
    Device Accel Profile (241):     0
    Device Accel Constant Deceleration (242):       1.000000
    Device Accel Adaptive Deceleration (243):       1.000000
    Device Accel Velocity Scaling (244):    10.000000
    Device Product ID (234):        9589, 34643
    Device Node (235):      "/dev/input/event1"
    Evdev Axis Inversion (245):     0, 0
    Evdev Axis Calibration (246):   <no items>
    Evdev Axes Swap (247):  0
    Axis Labels (248):      "Abs MT Position X" (239), "Abs MT Position Y" (240), "None" (0), "None" (0)
    Button Labels (249):    "Button Unknown" (236), "Button Unknown" (236), "Button Unknown" (236), "Button Wheel Up" (122), "Button Wheel Down" (123)
    Evdev Scrolling Distance (250): 0, 0, 0
    Evdev Middle Button Emulation (251):    1
    Evdev Middle Button Timeout (252):      50
    Evdev Third Button Emulation (253):     1
    Evdev Third Button Emulation Timeout (254):     750
    Evdev Third Button Emulation Button (255):      3
    Evdev Third Button Emulation Threshold (256):   50
    Evdev Wheel Emulation (257):    0
    Evdev Wheel Emulation Axes (258):       0, 0, 4, 5
    Evdev Wheel Emulation Inertia (259):    10
    Evdev Wheel Emulation Timeout (260):    200
    Evdev Wheel Emulation Button (261):     4
    Evdev Drag Lock Buttons (262):  0

From the little I know this looks right, though not sure about the middle button emulation (I tried turning it off but it did not disable when the option was set to false).

Here’s a portion of running evtest and trying a long press:

Testing ... (interrupt to exit)
Event: time 1491009642.810498, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 22159
Event: time 1491009642.810498, type 3 (EV_ABS), code 1 (ABS_Y), value 22159
Event: time 1491009642.810498, -------------- SYN_REPORT ------------
Event: time 1491009642.817528, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 22162
Event: time 1491009642.817528, type 3 (EV_ABS), code 1 (ABS_Y), value 22162
Event: time 1491009642.817528, -------------- SYN_REPORT ------------
Event: time 1491009642.824561, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 22166
Event: time 1491009642.824561, type 3 (EV_ABS), code 1 (ABS_Y), value 22166
Event: time 1491009642.824561, -------------- SYN_REPORT ------------
Event: time 1491009642.831523, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 22174
Event: time 1491009642.831523, type 3 (EV_ABS), code 1 (ABS_Y), value 22174
Event: time 1491009642.831523, -------------- SYN_REPORT ------------
Event: time 1491009642.838532, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 22184
Event: time 1491009642.838532, type 3 (EV_ABS), code 1 (ABS_Y), value 22184
Event: time 1491009642.838532, -------------- SYN_REPORT ------------
Event: time 1491009642.844533, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 22181
Event: time 1491009642.844533, type 3 (EV_ABS), code 1 (ABS_Y), value 22181
Event: time 1491009642.844533, -------------- SYN_REPORT ------------
Event: time 1491009642.851526, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 22182
Event: time 1491009642.851526, type 3 (EV_ABS), code 1 (ABS_Y), value 22182
Event: time 1491009642.851526, -------------- SYN_REPORT ------------
Event: time 1491009642.865508, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 1491009642.865508, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 1491009642.865508, -------------- SYN_REPORT ------------
Event: time 1491009646.736228, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 47
Event: time 1491009646.736228, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1669
Event: time 1491009646.736228, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 2434
Event: time 1491009646.736228, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1491009646.736228, type 3 (EV_ABS), code 0 (ABS_X), value 1669
Event: time 1491009646.736228, type 3 (EV_ABS), code 1 (ABS_Y), value 2434
Event: time 1491009646.736228, -------------- SYN_REPORT ------------
Event: time 1491009647.895395, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1668
Event: time 1491009647.895395, type 3 (EV_ABS), code 0 (ABS_X), value 1668
Event: time 1491009647.895395, -------------- SYN_REPORT ------------
Event: time 1491009647.929399, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1667
Event: time 1491009647.929399, type 3 (EV_ABS), code 0 (ABS_X), value 1667
Event: time 1491009647.929399, -------------- SYN_REPORT ------------
Event: time 1491009647.943401, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1666
Event: time 1491009647.943401, type 3 (EV_ABS), code 0 (ABS_X), value 1666
Event: time 1491009647.943401, -------------- SYN_REPORT ------------
Event: time 1491009648.346471, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1665
Event: time 1491009648.346471, type 3 (EV_ABS), code 0 (ABS_X), value 1665
Event: time 1491009648.346471, -------------- SYN_REPORT ------------
Event: time 1491009648.360476, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1664
Event: time 1491009648.360476, type 3 (EV_ABS), code 0 (ABS_X), value 1664
Event: time 1491009648.360476, -------------- SYN_REPORT ------------
Event: time 1491009648.436482, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 1491009648.436482, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0

I don’t understand, since the touch down is held (and seen to be) so long, the event isn’t changed into a button 3?

Am I on the wrong track?

#3

Looks like you got as far as i did. The best i could achieve was to install twofing. I could then right click by using 2 fingers. However twofing can break some apps so you need to be able to switch it on and off.

#4

Indeed, and no further since, though this is working well enough for the limited use I needed. I do hope someone runs across this with a better idea!