1 files changed, 198 insertions, 0 deletions
diff --git a/vncviewer/BaseTouchHandler.cxx b/vncviewer/BaseTouchHandler.cxx
new file mode 100644
index 00000000..ad27ffde
--- /dev/null
+++ b/vncviewer/BaseTouchHandler.cxx
@@ -0,0 +1,198 @@
+/* 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);
+}