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import type { Types } from '@cornerstonejs/core';
import Events from '../../enums/Events';
import mouseMoveListener from './mouseMoveListener';
import { EventTypes, IPoints } from '../../types';
import getMouseEventPoints from './getMouseEventPoints';
const { MOUSE_DOWN, MOUSE_DOWN_ACTIVATE, MOUSE_CLICK, MOUSE_UP, MOUSE_DRAG } =
Events;
// The amount of time in milliseconds within which a browser 'dblclick' event has to occur.
// Any mouse down, up, down and up sequence taking longer than this time is considered to
// NOT be a double click and any browser 'dblclick' event that subsequently occurs as a result
// of such a sequence will be ignored. It is best to set this to a value that is less
// than the system value for detecting a double click. Setting something too large
// might detect a double click that does not constitute a browser 'dblclick' and thus
// no mouse events for the sequence will get fired at all.
//
// TODO This module should detect and fire 'dblclick' events at its discretion and
// ignore all those generated by the browser.
//
const DOUBLE_CLICK_TOLERANCE_MS = 400;
// A drag (projected distance) during the double click timeout that is greater than this
// value will cancel the timeout and suppress any double click that might occur.
// This tolerance is particularly important on touch devices where some movement
// might occur between the two clicks.
//
// TODO revisit this value for touch devices
//
const DOUBLE_CLICK_DRAG_TOLERANCE = 3;
interface IMouseDownListenerState {
mouseButton: number;
element: HTMLDivElement;
renderingEngineId: string;
viewportId: string;
isClickEvent: boolean;
clickDelay: number;
preventClickTimeout: ReturnType<typeof setTimeout>;
startPoints: IPoints;
lastPoints: IPoints;
}
interface IDoubleClickState {
doubleClickTimeout: ReturnType<typeof setTimeout>;
mouseDownEvent: MouseEvent;
mouseUpEvent: MouseEvent;
ignoreDoubleClick: boolean;
}
// STATE
const defaultState: IMouseDownListenerState = {
mouseButton: undefined,
//
element: null,
renderingEngineId: undefined,
viewportId: undefined,
//
isClickEvent: true,
clickDelay: 200,
preventClickTimeout: null,
startPoints: {
page: [0, 0],
client: [0, 0],
canvas: [0, 0],
world: [0, 0, 0],
},
lastPoints: {
page: [0, 0],
client: [0, 0],
canvas: [0, 0],
world: [0, 0, 0],
},
};
let state: IMouseDownListenerState = {
mouseButton: undefined,
//
renderingEngineId: undefined,
viewportId: undefined,
//
isClickEvent: true,
clickDelay: 200,
element: null,
preventClickTimeout: null,
startPoints: {
page: [0, 0],
client: [0, 0],
canvas: [0, 0],
world: [0, 0, 0],
},
lastPoints: {
page: [0, 0],
client: [0, 0],
canvas: [0, 0],
world: [0, 0, 0],
},
};
const doubleClickState: IDoubleClickState = {
doubleClickTimeout: null,
mouseDownEvent: null,
mouseUpEvent: null,
ignoreDoubleClick: false,
};
/**
* Listens to mouse down events from the DOM and depending on interaction and further
* interaction can emit the following mouse events:
*
* - MOUSE_DOWN
* - MOUSE_DOWN_ACTIVATE
* - MOUSE_DRAG (move while down)
* - MOUSE_UP
* - MOUSE_CLICK
*
* The mouse down is NOT handled immediately. Instead, a timeout is started to
* determine if this mouse down is the first in a sequence that constitutes a
* double click.
*
* @param evt - The Mouse event.
* @private
*/
function mouseDownListener(evt: MouseEvent) {
// Ignore any mouse down during the double click timeout because only
// the first mouse down has the potential of being handled.
if (doubleClickState.doubleClickTimeout) {
return;
}
doubleClickState.doubleClickTimeout = setTimeout(
_doStateMouseDownAndUp,
DOUBLE_CLICK_TOLERANCE_MS
);
// First mouse down of a potential double click. So save it and start
// a timeout to determine a double click.
doubleClickState.mouseDownEvent = evt;
state.element = <HTMLDivElement>evt.currentTarget;
state.mouseButton = evt.button;
const enabledElement = getEnabledElement(state.element);
const { renderingEngineId, viewportId } = enabledElement;
state.renderingEngineId = renderingEngineId;
state.viewportId = viewportId;
state.preventClickTimeout = setTimeout(
_preventClickHandler,
state.clickDelay
);
// Prevent CornerstoneToolsMouseMove while mouse is down
state.element.removeEventListener('mousemove', mouseMoveListener);
const startPoints = getMouseEventPoints(evt, state.element);
state.startPoints = _copyPoints(startPoints);
state.lastPoints = _copyPoints(startPoints);
document.addEventListener('mouseup', _onMouseUp);
document.addEventListener('mousemove', _onMouseDrag);
}
/**
* Does the actual mouse down logic if the double click timer has expired or
* a mouse drag has started.
* @param evt the mouse down event
* @private
*/
function _doMouseDown(evt: MouseEvent) {
const deltaPoints = _getDeltaPoints(state.startPoints, state.startPoints);
const eventDetail: EventTypes.MouseDownEventDetail = {
event: evt,
eventName: MOUSE_DOWN,
element: state.element,
mouseButton: state.mouseButton,
renderingEngineId: state.renderingEngineId,
viewportId: state.viewportId,
camera: {},
startPoints: state.startPoints,
lastPoints: state.startPoints,
currentPoints: state.startPoints,
deltaPoints,
};
state.lastPoints = _copyPoints(eventDetail.lastPoints);
// by triggering MOUSE_DOWN it checks if this is toolSelection, handle modification etc.
// of already existing tools
const notConsumed = triggerEvent(
eventDetail.element,
MOUSE_DOWN,
eventDetail
);
// if no tools responded to this event and prevented its default behavior,
// create a new tool
if (notConsumed) {
triggerEvent(eventDetail.element, MOUSE_DOWN_ACTIVATE, eventDetail);
}
}
/**
*_onMouseDrag - Handle emission of drag events whilst the mouse is depressed.
*
* @private
* @param evt - The mouse event.
*/
function _onMouseDrag(evt: MouseEvent) {
const currentPoints = getMouseEventPoints(evt, state.element);
const lastPoints = _updateMouseEventsLastPoints(
state.element,
state.lastPoints
);
const deltaPoints = _getDeltaPoints(currentPoints, lastPoints);
Eif (doubleClickState.doubleClickTimeout) {
Eif (_isDragPastDoubleClickTolerance(deltaPoints.canvas)) {
_doStateMouseDownAndUp();
// Dragging past the tolerance means no double click should occur.
doubleClickState.ignoreDoubleClick = true;
} else {
return;
}
}
const eventDetail: EventTypes.MouseDragEventDetail = {
event: evt,
eventName: MOUSE_DRAG,
mouseButton: state.mouseButton,
renderingEngineId: state.renderingEngineId,
viewportId: state.viewportId,
camera: {},
element: state.element,
startPoints: _copyPoints(state.startPoints),
lastPoints: _copyPoints(lastPoints),
currentPoints,
deltaPoints,
};
triggerEvent(state.element, MOUSE_DRAG, eventDetail);
// Update the last points
state.lastPoints = _copyPoints(currentPoints);
}
/**
*_onMouseUp - Handle emission of mouse up events, and re-enabling mouse move events.
*
* If the mouse up event occurs during a double click timeout, it is either the first or
* second mouse up of a potential double click sequence. If the first, then it
* is saved in case the double click timeout expires and a simple mouse down and
* up have to get executed. If the second, then the latest mouse down, up, down and
* up constitute a double click and the mouseDoubleClickListener needs to execute.
*
* If the mouse up event comes after the double click timeout, then it is simply
* handled as the up of a mouse down and up sequence.
*
* @private
* @param evt - The mouse event.
*/
function _onMouseUp(evt: MouseEvent): void {
// Cancel the timeout preventing the click event from triggering
clearTimeout(state.preventClickTimeout);
Iif (doubleClickState.doubleClickTimeout) {
// received a mouse up while waiting for a double click (via a timeout)
if (!doubleClickState.mouseUpEvent) {
// this is the first mouse up during the double click timeout; we'll need it later if the timeout expires
doubleClickState.mouseUpEvent = evt;
state.element.addEventListener('mousemove', _onMouseMove);
} else {
// this is the second mouse up of a double click!
document.removeEventListener('mouseup', _onMouseUp);
state.element.removeEventListener('mousemove', _onMouseMove);
// Restore our global mousemove listener
state.element.addEventListener('mousemove', mouseMoveListener);
// ignore any mouse down and up events captured and let the double click happen
_clearDoubleClickTimeoutAndEvents();
doubleClickState.ignoreDoubleClick = false;
state = JSON.parse(JSON.stringify(defaultState));
}
} else {
// Handle the actual mouse up. Note that it may have occurred during the double click timeout or
// after it expired. In either case this block is being executed after the time out has expired
// or after a drag started.
const eventName = state.isClickEvent ? MOUSE_CLICK : MOUSE_UP;
const currentPoints = getMouseEventPoints(evt, state.element);
const deltaPoints = _getDeltaPoints(currentPoints, state.lastPoints);
const eventDetail:
| EventTypes.MouseUpEventDetail
| EventTypes.MouseClickEventType = {
event: evt,
eventName,
mouseButton: state.mouseButton,
element: state.element,
renderingEngineId: state.renderingEngineId,
viewportId: state.viewportId,
camera: {},
startPoints: _copyPoints(state.startPoints),
lastPoints: _copyPoints(state.lastPoints),
currentPoints,
deltaPoints,
};
triggerEvent(eventDetail.element, eventName, eventDetail);
document.removeEventListener('mouseup', _onMouseUp);
state.element.removeEventListener('mousemove', _onMouseMove);
// Restore our global mousemove listener
state.element.addEventListener('mousemove', mouseMoveListener);
// Restore `state` to `defaultState`
state = JSON.parse(JSON.stringify(defaultState));
}
// Remove the drag as soon as we get the mouse up because either we have executed
// the mouse up logic, or we have not even handled the mouse down logic yet
// - either way no drag should/can occur.
document.removeEventListener('mousemove', _onMouseDrag);
}
/**
* Handles a mouse move on the state element after a mouse down AND up AND
* while the double click timeout is still running.
* @private
* @param evt - The mouse event.
*/
function _onMouseMove(evt: MouseEvent) {
const currentPoints = getMouseEventPoints(evt, state.element);
const lastPoints = _updateMouseEventsLastPoints(
state.element,
state.lastPoints
);
const deltaPoints = _getDeltaPoints(currentPoints, lastPoints);
if (!_isDragPastDoubleClickTolerance(deltaPoints.canvas)) {
return;
}
_doStateMouseDownAndUp();
// Moving past the tolerance means no double click should occur.
doubleClickState.ignoreDoubleClick = true;
// Do the move again because during the timeout the global mouse move listener was removed.
// Now it is back.
mouseMoveListener(evt);
}
/**
* Determines if the given delta is past the double click, (projected) drag distance
* tolerance.
* @param delta the delta
* @returns true iff the delta is past the tolerance
*/
function _isDragPastDoubleClickTolerance(delta: Types.Point2): boolean {
return Math.abs(delta[0]) + Math.abs(delta[1]) > DOUBLE_CLICK_DRAG_TOLERANCE;
}
function _preventClickHandler() {
state.isClickEvent = false;
}
/**
* Do a mouse down and potential mouse up using each of the events in the double click state.
* The events were stored in the state during the timeout to determine a double click.
*
* This function should be invoked whenever it is determined that the latest
* sequence of mouse down(s) and up(s) is NOT a double click. Examples of this include
* - the expiration of the double click timeout
* - a mouse drag/move beyond the DOUBLE_CLICK_DRAG_TOLERANCE
*
* This function sets the doubleClickState.ignoreDoubleClick flag in case our timeout value
* or mouse move/drag tolerance is inaccurate and we do indeed get a double click event from
* the browser later. The flag will be cleared in the mouseDoubleClickIgnoreListener should a
* double click event get fired. If there is no eventual double click for the latest sequence,
* the flag spills into the next sequence where it will either get set again (here) or cleared in
* _onMouseUp if an actual double click is detected. It is perfectly safe for the flag to be
* left true when no double click actually occurs because any future double click must start with
* a mouse down that is handled in this module.
*
* @private
*/
function _doStateMouseDownAndUp() {
doubleClickState.ignoreDoubleClick = true;
const mouseDownEvent = doubleClickState.mouseDownEvent;
const mouseUpEvent = doubleClickState.mouseUpEvent;
_clearDoubleClickTimeoutAndEvents();
_doMouseDown(mouseDownEvent);
Iif (mouseUpEvent) {
_onMouseUp(mouseUpEvent);
}
}
/**
* Clears the mouse events and double click timeout id in the double click state object.
* The timeout itself is also cleared so that no callback is invoked.
*/
function _clearDoubleClickTimeoutAndEvents() {
clearTimeout(doubleClickState.doubleClickTimeout);
doubleClickState.doubleClickTimeout = null;
doubleClickState.mouseDownEvent = null;
doubleClickState.mouseUpEvent = null;
}
/**
* Copies a set of points.
* @param points - The `IPoints` instance to copy.
*
* @returns A copy of the points.
*/
function _copyPoints(points: IPoints): IPoints {
return JSON.parse(JSON.stringify(points));
}
/**
* Recalculates the last world coordinate, as the linear transform from client
* to world could be different if the camera was updated.
* @param element - The HTML element
* @param lastPoints - The last points
*/
function _updateMouseEventsLastPoints(
element: HTMLDivElement,
lastPoints: IPoints
): IPoints {
const { viewport } = getEnabledElement(element);
// Need to update the world point to be calculated from the current reference frame,
// Which might have changed since the last interaction.
const world = viewport.canvasToWorld(lastPoints.canvas);
return {
page: lastPoints.page,
client: lastPoints.client,
canvas: lastPoints.canvas,
world,
};
}
/**
* Returns the difference between two `IPoints` instances.
* @param currentPoints - The current points.
* @param lastPoints -- The last points, to be subtracted from the `currentPoints`.
*
* @returns The difference in IPoints format
*/
function _getDeltaPoints(currentPoints: IPoints, lastPoints: IPoints): IPoints {
return {
page: _subtractPoints2D(currentPoints.page, lastPoints.page),
client: _subtractPoints2D(currentPoints.client, lastPoints.client),
canvas: _subtractPoints2D(currentPoints.canvas, lastPoints.canvas),
world: _subtractPoints3D(currentPoints.world, lastPoints.world),
};
}
/**
* _subtractPoints - Subtracts `point1` from `point0`.
* @param point0 - The first point.
* @param point1 - The second point to subtract from the first.
*
* @returns The difference.
*/
function _subtractPoints2D(
point0: Types.Point2,
point1: Types.Point2
): Types.Point2 {
return [point0[0] - point1[0], point0[1] - point1[1]];
}
function _subtractPoints3D(
point0: Types.Point3,
point1: Types.Point3
): Types.Point3 {
return [point0[0] - point1[0], point0[1] - point1[1], point0[2] - point1[2]];
}
export function getMouseButton(): number {
return state.mouseButton;
}
/**
* Adds a capture phase double click listener to the document that ignores double
* click events as determined by this module.
*/
export function addIgnoreDoubleClickCaptureListener() {
document.addEventListener('dblclick', _mouseDoubleClickIgnoreListener, {
capture: true,
});
}
/**
* Removes a capture phase double click listener from the document that ignores double
* click events as determined by this module.
*/
export function removeIgnoreDoubleClickCaptureListener() {
document.removeEventListener('dblclick', _mouseDoubleClickIgnoreListener, {
capture: true,
});
}
/**
* Handles a dblclick event to determine if it should be ignored based on the
* double click state's ignoreDoubleClick flag. stopImmediatePropagation and
* preventDefault are used to ingore the event.
* @param evt browser dblclick event
*/
function _mouseDoubleClickIgnoreListener(evt: MouseEvent) {
if (doubleClickState.ignoreDoubleClick) {
doubleClickState.ignoreDoubleClick = false;
// Use stopImmediatePropagation to lessen the possibility that a third party 'dblclick'
// listener receives this event. However, there still is no guarantee
// that any third party listener has not already handled the event.
evt.stopImmediatePropagation();
evt.preventDefault();
}
}
export default mouseDownListener;
|