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KASM-1871 Add smooth scrolling by sending scroll delta directly

This commit is contained in:
Mariusz Marciniak 2021-09-16 13:00:10 +02:00
parent 09707e9820
commit fff810d45a
1 changed files with 28 additions and 47 deletions
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77
core/rfb.js
View File

@ -44,8 +44,7 @@ var _enableWebP = false;
const MOUSE_MOVE_DELAY = 17;
// Wheel thresholds
const WHEEL_STEP = 50; // Pixels needed for one step
const WHEEL_LINE_HEIGHT = 19; // Assumed pixels for one line step
let WHEEL_LINE_HEIGHT = 19; // Pixels for one line step (on Windows)
// Gesture thresholds
const GESTURE_ZOOMSENS = 75;
@ -1317,6 +1316,13 @@ export default class RFB extends EventTargetMixin {
this._display.absY(y), mask);
}
_sendScroll(x, y, dX, dY) {
if (this._rfbConnectionState !== 'connected') { return; }
if (this._viewOnly) { return; } // View only, skip mouse events
RFB.messages.pointerEvent(this._sock, this._display.absX(x), this._display.absY(y), 0, dX, dY);
}
_handleWheel(ev) {
if (this._rfbConnectionState !== 'connected') { return; }
if (this._viewOnly) { return; } // View only, skip mouse events
@ -1324,28 +1330,6 @@ export default class RFB extends EventTargetMixin {
ev.stopPropagation();
ev.preventDefault();
let pos = clientToElement(ev.clientX, ev.clientY,
this._canvas);
let dX = ev.deltaX;
let dY = ev.deltaY;
// Pixel units unless it's non-zero.
// Note that if deltamode is line or page won't matter since we aren't
// sending the mouse wheel delta to the server anyway.
// The difference between pixel and line can be important however since
// we have a threshold that can be smaller than the line height.
if (ev.deltaMode !== 0) {
dX *= WHEEL_LINE_HEIGHT;
dY *= WHEEL_LINE_HEIGHT;
}
// Mouse wheel events are sent in steps over VNC. This means that the VNC
// protocol can't handle a wheel event with specific distance or speed.
// Therefor, if we get a lot of small mouse wheel events we combine them.
this._accumulatedWheelDeltaX += dX;
this._accumulatedWheelDeltaY += dY;
// On MacOs we need to translate zooming CMD+wheel to CTRL+wheel
if (isMac() && this._keyboard._keyDownList["MetaLeft"]) {
this._keyboard._sendKeyEvent(this._keyboard._keyDownList["MetaLeft"], "MetaLeft", false);
@ -1374,30 +1358,21 @@ export default class RFB extends EventTargetMixin {
this._mouseLastPinchAndZoomTime = +new Date();
}
// Generate a mouse wheel step event when the accumulated delta
// for one of the axes is large enough.
if (Math.abs(this._accumulatedWheelDeltaX) >= WHEEL_STEP) {
if (this._accumulatedWheelDeltaX < 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 5);
this._handleMouseButton(pos.x, pos.y, false, 1 << 5);
} else if (this._accumulatedWheelDeltaX > 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 6);
this._handleMouseButton(pos.x, pos.y, false, 1 << 6);
// Pixel units unless it's non-zero.
// Note that if deltamode is line or page won't matter since we aren't
// sending the mouse wheel delta to the server anyway.
// The difference between pixel and line can be important however since
// we have a threshold that can be smaller than the line height.
let dX = ev.deltaX;
let dY = ev.deltaY;
if (ev.deltaMode !== 0) {
dX *= WHEEL_LINE_HEIGHT;
dY *= WHEEL_LINE_HEIGHT;
}
this._accumulatedWheelDeltaX = 0;
}
if (Math.abs(this._accumulatedWheelDeltaY) >= WHEEL_STEP) {
if (this._accumulatedWheelDeltaY < 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 3);
this._handleMouseButton(pos.x, pos.y, false, 1 << 3);
} else if (this._accumulatedWheelDeltaY > 0) {
this._handleMouseButton(pos.x, pos.y, true, 1 << 4);
this._handleMouseButton(pos.x, pos.y, false, 1 << 4);
}
this._accumulatedWheelDeltaY = 0;
}
const pointer = clientToElement(ev.clientX, ev.clientY, this._canvas);
this._sendScroll(pointer.x, pointer.y, dX, dY);
}
_fakeMouseMove(ev, elementX, elementY) {
@ -3032,7 +3007,7 @@ RFB.messages = {
sock.flush();
},
pointerEvent(sock, x, y, mask) {
pointerEvent(sock, x, y, mask, dX = 0, dY = 0) {
const buff = sock._sQ;
const offset = sock._sQlen;
@ -3046,7 +3021,13 @@ RFB.messages = {
buff[offset + 4] = y >> 8;
buff[offset + 5] = y;
sock._sQlen += 6;
buff[offset + 6] = dX >> 8;
buff[offset + 7] = dX;
buff[offset + 8] = dY >> 8;
buff[offset + 9] = dY;
sock._sQlen += 10;
sock.flush();
},