pi@raspberrypi:~ $ sudo evtest /dev/input/event2 
Input driver version is 1.0.1
Input device ID: bus 0x3 vendor 0x192f product 0x416 version 0x111
Input device name: "USB Optical Mouse"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 272 (BTN_LEFT)
    Event code 273 (BTN_RIGHT)
    Event code 274 (BTN_MIDDLE)
  Event type 2 (EV_REL)
    Event code 0 (REL_X)
    Event code 1 (REL_Y)
    Event code 6 (REL_HWHEEL)
    Event code 8 (REL_WHEEL)
  Event type 4 (EV_MSC)
    Event code 4 (MSC_SCAN)
Properties:
Testing ... (interrupt to exit)






Event: time 1502281968.518936, -------------- EV_SYN ------------
Event: time 1502281968.646926, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90001
Event: time 1502281968.646926, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1502281968.646926, -------------- EV_SYN ------------




pi@raspberrypi:~ $ sudo evtest /dev/input/event3
Input driver version is 1.0.1
Input device ID: bus 0x3 vendor 0x3eb product 0x8a6e version 0x111
Input device name: "Atmel Atmel maXTouch Digitizer"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value   1078
      Min        0
      Max     4095
      Resolution      12
    Event code 1 (ABS_Y)
      Value   3218
      Min        0
      Max     4095
      Resolution      15
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        9
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     4095
      Resolution      12
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max     4095
      Resolution      15
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
Properties:
  Property type 1 (INPUT_PROP_DIRECT)
Testing ... (interrupt to exit)



Event: time 1502282136.626462, -------------- EV_SYN ------------
Event: time 1502282136.703407, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 1502282136.703407, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 1502282136.703407, -------------- EV_SYN ------------

gboolean Ctrl::GtkEvent(GtkWidget *widget, GdkEvent *event, gpointer user_data)

void Switch::MouseMove(Point p, dword keyflags) {
    Cout() << "Switch::MouseMove(): "; 
    ...
}

// Add log for the rest of events and try to understand the logic...
void Switch::LeftDown(Point p, dword keyflags) { ... }
void Switch::LeftUp(Point p, dword keyflags) { ... }
void Switch::MouseLeave() { ... }

Cout() << "My message!" << "\n";

GDK_BUTTON_PRESS
GDK_PROPERTY_NOTIFY
Switch::MouseMove: pushindex: 3 value: 002
Switch::LeftDown: pushindex: 3 value: 002
GDK_EXPOSE
GDK_BUTTON_RELEASE
Switch::LeftUp (before the outer if cycle): pushindex: 3 value: 002
Switch::LeftUp (inside the outer if cycle): pushindex: 3 value: 002
Switch::LeftUp (inside the inner if cycle): pushindex: 3 v: 005 value: 002
Switch::LeftUp: pushindex: -1 value: 005

GDK_BUTTON_PRESS
GDK_PROPERTY_NOTIFY
Switch::MouseMove: pushindex: 3 value: 002
GDK_EXPOSE
Switch::MouseMove: pushindex: 3 value: 002
Switch::LeftDown: pushindex: 3 value: 002
GDK_EXPOSE
GDK_MOTION_NOTIFY
GDK_BUTTON_RELEASE
Switch::MouseMove: pushindex: -1 value: 002
GDK_EXPOSE
Switch::LeftUp (before the outer if cycle): pushindex: -1 value: 002
Switch::LeftUp: pushindex: -1 value: 002

	if(pushindex >= 0 && pushindex < cs.GetCount()) {
		RefreshCase(GetIndex());
		const Value& v = cs[pushindex].value;
		if(v != value) {
			value = v;
			UpdateAction();
		}
		RefreshCase(pushindex);
	}

	int i = GetIndex(p);
	int a = -1;
	if(keyflags & K_MOUSELEFT)
		a = i;
	if(pushindex != a) {
		RefreshCase(pushindex);
		RefreshCase(a);
		pushindex = a;
	}

	int i = GetIndex(p);
//	int a = -1;
	int a = pushindex;
	if(keyflags & K_MOUSELEFT)
		a = i;
	if(pushindex != a) {
		RefreshCase(pushindex);
		RefreshCase(a);
		pushindex = a;
	}

00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
drm_kms_helper        155648  1 i915
drm                   360448  8 i915,drm_kms_helper
/dev/fb0
/dev/dri/card0
/dev/dri/renderD128
/dev/dri/controlD64
BOOT_IMAGE=/boot/vmlinuz-4.9.0-4-amd64 root=UUID=98a2e6b5-fc24-44c8-92cb-52a8c17f70a9 ro quiet
/etc/modprobe.d/
direct rendering: Yes
server glx vendor string: SGI
client glx vendor string: Mesa Project and SGI
    Vendor: Intel Open Source Technology Center (0x8086)
OpenGL vendor string: Intel Open Source Technology Center
[    58.105] (II) LoadModule: "glx"
[    58.129] (II) LoadModule: "modesetting"
[    58.135] (II) LoadModule: "fbdev"
[    58.151] (II) LoadModule: "vesa"
[    58.153] (II) LoadModule: "fbdevhw"
[    58.164] (II) LoadModule: "glamoregl"
[    58.250] (II) LoadModule: "fb"
[    58.459] (II) LoadModule: "libinput"

p = [160, 138]
p = [160, 138]
p = [160, 138]
p = [160, 138]
p = [160, 138]

GDK_BUTTON_PRESS
GDK_PROPERTY_NOTIFY
Switch::MouseMove: pushindex: 3 value: 002
GDK_EXPOSE
Switch::MouseMove: pushindex: 3 value: 002
Switch::LeftDown: pushindex: 3 value: 002
GDK_EXPOSE
GDK_MOTION_NOTIFY
GDK_BUTTON_RELEASE
Switch::MouseMove: pushindex: -1 value: 002
GDK_EXPOSE
Switch::LeftUp (before the outer if cycle): pushindex: -1 value: 002
Switch::LeftUp: pushindex: -1 value: 002

p = [158, 142]
keyflags & K_MOUSELEFT = 8388608
p = [158, 142]
keyflags & K_MOUSELEFT = 0
p = [158, 142]
keyflags & K_MOUSELEFT = 0
p = [158, 142]
keyflags & K_MOUSELEFT = 0
p = [158, 142]
keyflags & K_MOUSELEFT = 0

MouseMove
p = [155, 136]
keyflags & K_MOUSELEFT = 8388608
MouseMove
p = [155, 136]
keyflags & K_MOUSELEFT = 0
MouseMove
p = [155, 136]
keyflags & K_MOUSELEFT = 0
LeftDown
p = [155, 136]
keyflags & K_MOUSELEFT = 0
LeftUp
p = [155, 136]
keyflags & K_MOUSELEFT = 0
MouseMove

#include <CtrlCore/CtrlCore.h>

#ifdef GUI_GTK

namespace Upp {

#define LLOG(x)    // DLOG(rmsecs() << ' ' << x)
#define LOG_EVENTS

void Ctrl::AddEvent(gpointer user_data, int type, const Value& value, GdkEvent *event)
{
	if(Events.GetCount() > 50000)
		return;
	GEvent& e = Events.AddTail();
	e.windowid = (uint32)(uintptr_t)user_data;
	e.type = type;
	e.value = value;
	gint x, y;
	GdkModifierType mod;
	gdk_window_get_pointer(gdk_get_default_root_window(), &x, &y, &mod);
	e.mousepos = Point(x, y);
	e.state = mod;
	e.count = 1;
	e.event = NULL;
	if(event) {
		e.time = gdk_event_get_time(event);
		e.event = gdk_event_copy(event);
	}
	else {
		e.time = gtk_get_current_event_time();
		e.event = gtk_get_current_event();
	}
        DUMPHEX(mod);
}