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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;
interface IMouseDownListenerState {
mouseButton: number;
element: HTMLDivElement;
renderingEngineId: string;
viewportId: string;
isClickEvent: boolean;
clickDelay: number;
preventClickTimeout: ReturnType<typeof setTimeout>;
startPoints: IPoints;
lastPoints: IPoints;
}
// 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],
},
};
/**
* 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
*
* @param evt - The Mouse event.
* @private
*/
function mouseDownListener(evt: MouseEvent) {
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);
const deltaPoints = _getDeltaPoints(startPoints, startPoints);
const eventDetail: EventTypes.MouseDownEventDetail = {
event: evt,
eventName: MOUSE_DOWN,
element: state.element,
mouseButton: state.mouseButton,
renderingEngineId: state.renderingEngineId,
viewportId: state.viewportId,
camera: {},
startPoints,
lastPoints: startPoints,
currentPoints: startPoints,
deltaPoints,
};
state.startPoints = _copyPoints(eventDetail.startPoints);
state.lastPoints = _copyPoints(eventDetail.lastPoints);
// by triggering MOUSE_DOWN it checks if this is toolSelection, handle modification etc.
// of already existing tools
const eventDidPropagate = triggerEvent(
eventDetail.element,
MOUSE_DOWN,
eventDetail
);
// if no tools responded to this event and prevented its default propagation behavior,
// create a new tool
if (eventDidPropagate) {
triggerEvent(eventDetail.element, MOUSE_DOWN_ACTIVATE, eventDetail);
}
document.addEventListener('mousemove', _onMouseDrag);
document.addEventListener('mouseup', _onMouseUp);
}
/**
*_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);
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);
}
/**
*_onMouseDrag - Handle emission of mouse up events, and re-enabling mouse move events.
*
* @private
* @param evt - The mouse event.
*/
function _onMouseUp(evt: MouseEvent): void {
// Cancel the timeout preventing the click event from triggering
clearTimeout(state.preventClickTimeout);
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);
// Remove our temporary handlers
document.removeEventListener('mousemove', _onMouseDrag);
document.removeEventListener('mouseup', _onMouseUp);
// Restore our global mousemove listener
state.element.addEventListener('mousemove', mouseMoveListener);
// Restore `state` to `defaultState`
state = JSON.parse(JSON.stringify(defaultState));
}
function _preventClickHandler() {
state.isClickEvent = false;
}
/**
* 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;
}
export default mouseDownListener;
|