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/* Copyright 2019 Aaron Sowry for Cendio AB
* Copyright 2019-2020 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <math.h>
#define XK_MISCELLANY
#include <rfb/keysymdef.h>
#include <rfb/util.h>
#include "GestureHandler.h"
#include "BaseTouchHandler.h"
// Sensitivity threshold for gestures
static const int ZOOMSENS = 30;
static const int SCRLSENS = 50;
static const unsigned DOUBLE_TAP_TIMEOUT = 1000;
static const unsigned DOUBLE_TAP_THRESHOLD = 50;
BaseTouchHandler::BaseTouchHandler()
{
gettimeofday(&lastTapTime, NULL);
}
BaseTouchHandler::~BaseTouchHandler()
{
}
void BaseTouchHandler::handleGestureEvent(const GestureEvent& ev)
{
double magnitude;
switch (ev.type) {
case GestureBegin:
switch (ev.gesture) {
case GestureOneTap:
handleTapEvent(ev, 1);
break;
case GestureTwoTap:
handleTapEvent(ev, 3);
break;
case GestureThreeTap:
handleTapEvent(ev, 2);
break;
case GestureDrag:
fakeMotionEvent(ev);
fakeButtonEvent(true, 1, ev);
break;
case GestureLongPress:
fakeMotionEvent(ev);
fakeButtonEvent(true, 3, ev);
break;
case GestureTwoDrag:
lastMagnitudeX = ev.magnitudeX;
lastMagnitudeY = ev.magnitudeY;
fakeMotionEvent(ev);
break;
case GesturePinch:
lastMagnitudeX = sqrt(ev.magnitudeX * ev.magnitudeX +
ev.magnitudeY * ev.magnitudeY);
fakeMotionEvent(ev);
break;
}
break;
case GestureUpdate:
switch (ev.gesture) {
case GestureOneTap:
case GestureTwoTap:
case GestureThreeTap:
break;
case GestureDrag:
case GestureLongPress:
fakeMotionEvent(ev);
break;
case GestureTwoDrag:
// Always scroll in the same position.
// We don't know if the mouse was moved so we need to move it
// every update.
fakeMotionEvent(ev);
while ((ev.magnitudeY - lastMagnitudeY) > SCRLSENS) {
fakeButtonEvent(true, 4, ev);
fakeButtonEvent(false, 4, ev);
lastMagnitudeY += SCRLSENS;
}
while ((ev.magnitudeY - lastMagnitudeY) < -SCRLSENS) {
fakeButtonEvent(true, 5, ev);
fakeButtonEvent(false, 5, ev);
lastMagnitudeY -= SCRLSENS;
}
while ((ev.magnitudeX - lastMagnitudeX) > SCRLSENS) {
fakeButtonEvent(true, 6, ev);
fakeButtonEvent(false, 6, ev);
lastMagnitudeX += SCRLSENS;
}
while ((ev.magnitudeX - lastMagnitudeX) < -SCRLSENS) {
fakeButtonEvent(true, 7, ev);
fakeButtonEvent(false, 7, ev);
lastMagnitudeX -= SCRLSENS;
}
break;
case GesturePinch:
// Always scroll in the same position.
// We don't know if the mouse was moved so we need to move it
// every update.
fakeMotionEvent(ev);
magnitude = sqrt(ev.magnitudeX * ev.magnitudeX +
ev.magnitudeY * ev.magnitudeY);
if (abs(magnitude - lastMagnitudeX) > ZOOMSENS) {
fakeKeyEvent(true, XK_Control_L, ev);
while ((magnitude - lastMagnitudeX) > ZOOMSENS) {
fakeButtonEvent(true, 4, ev);
fakeButtonEvent(false, 4, ev);
lastMagnitudeX += ZOOMSENS;
}
while ((magnitude - lastMagnitudeX) < -ZOOMSENS) {
fakeButtonEvent(true, 5, ev);
fakeButtonEvent(false, 5, ev);
lastMagnitudeX -= ZOOMSENS;
}
fakeKeyEvent(false, XK_Control_L, ev);
}
}
break;
case GestureEnd:
switch (ev.gesture) {
case GestureOneTap:
case GestureTwoTap:
case GestureThreeTap:
case GesturePinch:
case GestureTwoDrag:
break;
case GestureDrag:
fakeMotionEvent(ev);
fakeButtonEvent(false, 1, ev);
break;
case GestureLongPress:
fakeMotionEvent(ev);
fakeButtonEvent(false, 3, ev);
break;
}
break;
}
}
void BaseTouchHandler::handleTapEvent(const GestureEvent& ev,
int buttonEvent)
{
GestureEvent newEv = ev;
// If the user quickly taps multiple times we assume they meant to
// hit the same spot, so slightly adjust coordinates
if ((rfb::msSince(&lastTapTime) < DOUBLE_TAP_TIMEOUT) &&
(firstDoubleTapEvent.type == ev.type)) {
double dx = firstDoubleTapEvent.eventX - ev.eventX;
double dy = firstDoubleTapEvent.eventY - ev.eventY;
double distance = sqrt((dx * dx) + (dy * dy));
if (distance < DOUBLE_TAP_THRESHOLD) {
newEv.eventX = firstDoubleTapEvent.eventX;
newEv.eventY = firstDoubleTapEvent.eventY;
} else {
firstDoubleTapEvent = ev;
}
} else {
firstDoubleTapEvent = ev;
}
gettimeofday(&lastTapTime, NULL);
fakeMotionEvent(newEv);
fakeButtonEvent(true, buttonEvent, newEv);
fakeButtonEvent(false, buttonEvent, newEv);
}
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