import {getLayerDetailsFromEvent} from '../gui/layerGroup';
import {precisionRound} from '../utils/string';
import {ScrollWheel} from './scrollWheel';
// doc imports
/* eslint-disable no-unused-vars */
import {App} from '../app/application';
/* eslint-enable no-unused-vars */
/**
* Scroll class.
*
* @example
* // create the dwv app
* const app = new dwv.App();
* // initialise
* const viewConfig0 = new dwv.ViewConfig('layerGroup0');
* const viewConfigs = {'*': [viewConfig0]};
* const options = new dwv.AppOptions(viewConfigs);
* options.tools = {Scroll: new dwv.ToolConfig()};
* app.init(options);
* // activate tool
* app.addEventListener('load', function () {
* app.setTool('Scroll');
* });
* // load dicom data
* app.loadURLs([
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323851.dcm',
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323707.dcm',
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323563.dcm'
* ]);
* @example <caption>Example with slider</caption>
* // create the dwv app
* const app = new dwv.App();
* // initialise
* const viewConfig0 = new dwv.ViewConfig('layerGroup0');
* const viewConfigs = {'*': [viewConfig0]};
* const options = new dwv.AppOptions(viewConfigs);
* options.tools = {Scroll: new dwv.ToolConfig()};
* app.init(options);
* // create range
* const range = document.createElement('input');
* range.type = 'range';
* range.min = 0;
* range.id = 'sliceRange';
* document.body.appendChild(range);
* // update app on slider change
* range.oninput = function () {
* const lg = app.getLayerGroupByDivId('layerGroup0');
* const vc = lg.getActiveViewLayer().getViewController();
* const index = vc.getCurrentIndex();
* const values = index.getValues();
* values[2] = this.value;
* vc.setCurrentIndex(new dwv.Index(values));
* }
* // activate tool and update range max on load
* app.addEventListener('load', function () {
* app.setTool('Scroll');
* const size = app.getImage(0).getGeometry().getSize();
* range.max = size.get(2) - 1;
* });
* // update slider on slice change (for ex via mouse wheel)
* app.addEventListener('positionchange', function () {
* const lg = app.getLayerGroupByDivId('layerGroup0');
* const vc = lg.getActiveViewLayer().getViewController();
* range.value = vc.getCurrentIndex().get(2);
* });
* // load dicom data
* app.loadURLs([
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323851.dcm',
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323707.dcm',
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323563.dcm'
* ]);
*/
export class Scroll {
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* Interaction start flag.
*
* @type {boolean}
*/
#started = false;
/**
* Scroll wheel handler.
*
* @type {ScrollWheel}
*/
#scrollWhell;
/**
* Touch timer ID (created by setTimeout).
*
* @type {number}
*/
#touchTimerID;
/**
* @param {App} app The associated application.
*/
constructor(app) {
this.#app = app;
this.#scrollWhell = new ScrollWheel(app);
}
/**
* Option to show or not a value tooltip on mousemove.
*
* @type {boolean}
*/
#displayTooltip = false;
/**
* Handle mouse down event.
*
* @param {object} event The mouse down event.
*/
mousedown = (event) => {
// optional tooltip
this.#removeTooltipDiv();
// stop viewer if playing
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup = this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewLayer = layerGroup.getActiveViewLayer();
const viewController = viewLayer.getViewController();
if (viewController.isPlaying()) {
viewController.stop();
}
// start flag
this.#started = true;
// first position
this.x0 = event._x;
this.y0 = event._y;
// update controller position
const planePos = viewLayer.displayToPlanePos(event._x, event._y);
const position = viewController.getPositionFromPlanePoint(
planePos.x, planePos.y);
viewController.setCurrentPosition(position);
};
/**
* Handle mouse move event.
*
* @param {object} event The mouse move event.
*/
mousemove = (event) => {
if (!this.#started) {
// optional tooltip
if (this.#displayTooltip) {
this.#showTooltip(event);
}
return;
}
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup = this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewLayer = layerGroup.getActiveViewLayer();
const viewController = viewLayer.getViewController();
// difference to last Y position
const diffY = event._y - this.y0;
const yMove = (Math.abs(diffY) > 15);
// do not trigger for small moves
if (yMove && viewController.canScroll()) {
// update view controller
if (diffY > 0) {
viewController.decrementScrollIndex();
} else {
viewController.incrementScrollIndex();
}
}
// difference to last X position
const diffX = event._x - this.x0;
const xMove = (Math.abs(diffX) > 15);
// do not trigger for small moves
const imageSize = viewController.getImageSize();
if (xMove && imageSize.moreThanOne(3)) {
// update view controller
if (diffX > 0) {
viewController.incrementIndex(3);
} else {
viewController.decrementIndex(3);
}
}
// reset origin point
if (xMove) {
this.x0 = event._x;
}
if (yMove) {
this.y0 = event._y;
}
};
/**
* Handle mouse up event.
*
* @param {object} _event The mouse up event.
*/
mouseup = (_event) => {
if (this.#started) {
// stop recording
this.#started = false;
}
};
/**
* Handle mouse out event.
*
* @param {object} event The mouse out event.
*/
mouseout = (event) => {
this.mouseup(event);
// remove possible tooltip div
this.#removeTooltipDiv();
};
/**
* Handle touch start event.
*
* @param {object} event The touch start event.
*/
touchstart = (event) => {
// long touch triggers the dblclick
// @ts-ignore
this.#touchTimerID = setTimeout(this.dblclick, 500);
// call mouse equivalent
this.mousedown(event);
};
/**
* Handle touch move event.
*
* @param {object} event The touch move event.
*/
touchmove = (event) => {
// abort timer if move
if (this.#touchTimerID !== null) {
clearTimeout(this.#touchTimerID);
this.#touchTimerID = null;
}
// call mouse equivalent
this.mousemove(event);
};
/**
* Handle touch end event.
*
* @param {object} event The touch end event.
*/
touchend = (event) => {
// abort timer
if (this.#touchTimerID !== null) {
clearTimeout(this.#touchTimerID);
this.#touchTimerID = null;
}
// call mouse equivalent
this.mouseup(event);
};
/**
* Handle mouse wheel event.
*
* @param {object} event The mouse wheel event.
*/
wheel = (event) => {
this.#scrollWhell.wheel(event);
};
/**
* Handle key down event.
*
* @param {object} event The key down event.
*/
keydown = (event) => {
event.context = 'Scroll';
this.#app.onKeydown(event);
};
/**
* Handle double click.
*
* @param {object} event The key down event.
*/
dblclick = (event) => {
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup = this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewController =
layerGroup.getActiveViewLayer().getViewController();
viewController.play();
};
/**
* Displays a tooltip in a temparary `span`.
* Works with css to hide/show the span only on mouse hover.
*
* @param {object} event The mouse move event.
*/
#showTooltip(event) {
// remove previous div
this.#removeTooltipDiv();
// get image value at position
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup = this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewLayer = layerGroup.getActiveViewLayer();
const viewController = viewLayer.getViewController();
const planePos = viewLayer.displayToPlanePos(event._x, event._y);
const position = viewController.getPositionFromPlanePoint(
planePos.x, planePos.y);
const value = viewController.getRescaledImageValue(position);
// create
if (typeof value !== 'undefined') {
const span = document.createElement('span');
span.id = 'scroll-tooltip';
// place span in layer group to avoid upper layer opacity
const layerDiv = document.getElementById(viewLayer.getId());
layerDiv.parentElement.appendChild(span);
// position tooltip
span.style.left = (event._x + 10) + 'px';
span.style.top = (event._y + 10) + 'px';
let text = precisionRound(value, 3).toString();
if (typeof viewController.getPixelUnit() !== 'undefined') {
text += ' ' + viewController.getPixelUnit();
}
span.appendChild(document.createTextNode(text));
}
}
/**
* Remove the tooltip html div.
*/
#removeTooltipDiv() {
const div = document.getElementById('scroll-tooltip');
if (div) {
div.remove();
}
}
/**
* Activate the tool.
*
* @param {boolean} _bool The flag to activate or not.
*/
activate(_bool) {
// remove tooltip html when deactivating
if (!_bool) {
this.#removeTooltipDiv();
}
}
/**
* Set the tool live features: disaply tooltip.
*
* @param {object} features The list of features.
*/
setFeatures(features) {
if (typeof features.displayTooltip !== 'undefined') {
this.#displayTooltip = features.displayTooltip;
}
}
/**
* Initialise the tool.
*/
init() {
// does nothing
}
} // Scroll class