import {getLayerDetailsFromEvent} from '../gui/layerGroup';
import {ScrollWheel} from './scrollWheel';
// doc imports
/* eslint-disable no-unused-vars */
import {App} from '../app/application';
/* eslint-enable no-unused-vars */
/**
* Opacity 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 = {Opacity: new dwv.ToolConfig()};
* app.init(options);
* // activate tool
* app.addEventListener('load', function () {
* app.setTool('Opacity');
* });
* // load dicom data
* app.loadURLs([
* 'https://raw.githubusercontent.com/ivmartel/dwv/master/tests/data/bbmri-53323851.dcm'
* ]);
*/
export class Opacity {
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* Interaction start flag.
*
* @type {boolean}
*/
#started = false;
/**
* Scroll wheel handler.
*
* @type {ScrollWheel}
*/
#scrollWhell;
/**
* @param {App} app The associated application.
*/
constructor(app) {
this.#app = app;
this.#scrollWhell = new ScrollWheel(app);
}
/**
* Handle mouse down event.
*
* @param {object} event The mouse down event.
*/
mousedown = (event) => {
// start flag
this.#started = true;
// first position
this.x0 = event._x;
this.y0 = event._y;
};
/**
* Handle mouse move event.
*
* @param {object} event The mouse move event.
*/
mousemove = (event) => {
if (!this.#started) {
return;
}
// difference to last X position
const diffX = event._x - this.x0;
const xMove = (Math.abs(diffX) > 15);
// do not trigger for small moves
if (xMove) {
const layerDetails = getLayerDetailsFromEvent(event);
const layerGroup =
this.#app.getLayerGroupByDivId(layerDetails.groupDivId);
const viewLayer = layerGroup.getActiveViewLayer();
const op = viewLayer.getOpacity();
viewLayer.setOpacity(op + (diffX / 200));
viewLayer.draw();
// reset origin point
this.x0 = event._x;
}
};
/**
* 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);
};
/**
* Handle touch start event.
*
* @param {object} event The touch start event.
*/
touchstart = (event) => {
// call mouse equivalent
this.mousedown(event);
};
/**
* Handle touch move event.
*
* @param {object} event The touch move event.
*/
touchmove = (event) => {
// call mouse equivalent
this.mousemove(event);
};
/**
* Handle touch end event.
*
* @param {object} event The touch end event.
*/
touchend = (event) => {
// 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 = 'Opacity';
this.#app.onKeydown(event);
};
/**
* Activate the tool.
*
* @param {boolean} _bool The flag to activate or not.
*/
activate(_bool) {
// does nothing
}
/**
* Initialise the tool.
*/
init() {
// does nothing
}
} // Opacity class