import {ListenerHandler} from '../utils/listen';
import {
Threshold as ThresholdFilter,
Sobel as SobelFilter,
Sharpen as SharpenFilter
} from '../image/filter';
// doc imports
/* eslint-disable no-unused-vars */
import {App} from '../app/application';
/* eslint-enable no-unused-vars */
/**
* Filter tool.
*/
export class Filter {
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* @param {App} app The associated application.
*/
constructor(app) {
this.#app = app;
}
/**
* Filter list
*
* @type {object}
*/
#filterList = null;
/**
* Selected filter.
*
* @type {object}
*/
#selectedFilter = 0;
/**
* Listener handler.
*
* @type {object}
*/
#listenerHandler = new ListenerHandler();
/**
* Activate the tool.
*
* @param {boolean} bool Flag to activate or not.
*/
activate(bool) {
// setup event listening
for (const key in this.#filterList) {
if (bool) {
this.#filterList[key].addEventListener('filterrun', this.#fireEvent);
this.#filterList[key].addEventListener('filter-undo', this.#fireEvent);
} else {
this.#filterList[key].removeEventListener(
'filterrun', this.#fireEvent);
this.#filterList[key].removeEventListener(
'filter-undo', this.#fireEvent);
}
}
}
/**
* Set the tool options.
*
* @param {object} options The list of filter names amd classes.
*/
setOptions(options) {
this.#filterList = {};
// try to instanciate filters from the options
for (const key in options) {
this.#filterList[key] = new options[key](this.#app);
}
}
/**
* Get the type of tool options: here 'instance' since the filter
* list contains instances of each possible filter.
*
* @returns {string} The type.
*/
getOptionsType() {
return 'instance';
}
/**
* Initialise the filter. Called once the image is loaded.
*/
init() {
// setup event listening
for (const key in this.#filterList) {
this.#filterList[key].init();
}
}
/**
* Handle keydown event.
*
* @param {object} event The keydown event.
*/
keydown = (event) => {
event.context = 'Filter';
this.#app.onKeydown(event);
};
/**
* Get the list of event names that this tool can fire.
*
* @returns {Array} The list of event names.
*/
getEventNames() {
return ['filterrun', 'filterundo'];
}
/**
* Add an event listener to this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type, will be called with the fired event.
*/
addEventListener(type, callback) {
this.#listenerHandler.add(type, callback);
}
/**
* Remove an event listener from this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type.
*/
removeEventListener(type, callback) {
this.#listenerHandler.remove(type, callback);
}
/**
* Fire an event: call all associated listeners with the input event object.
*
* @param {object} event The event to fire.
*/
#fireEvent = (event) => {
this.#listenerHandler.fireEvent(event);
};
/**
* Get the selected filter.
*
* @returns {object} The selected filter.
*/
getSelectedFilter() {
return this.#selectedFilter;
}
/**
* Set the tool live features: filter name.
*
* @param {object} features The list of features.
*/
setFeatures(features) {
if (typeof features.filterName !== 'undefined') {
// check if we have it
if (!this.hasFilter(features.filterName)) {
throw new Error('Unknown filter: \'' + features.filterName + '\'');
}
// de-activate last selected
if (this.#selectedFilter) {
this.#selectedFilter.activate(false);
}
// enable new one
this.#selectedFilter = this.#filterList[features.filterName];
// activate the selected filter
this.#selectedFilter.activate(true);
}
if (typeof features.run !== 'undefined' && features.run) {
let args = {};
if (typeof features.runArgs !== 'undefined') {
args = features.runArgs;
}
this.getSelectedFilter().run(args);
}
}
/**
* Get the list of filters.
*
* @returns {Array} The list of filter objects.
*/
getFilterList() {
return this.#filterList;
}
/**
* Check if a filter is in the filter list.
*
* @param {string} name The name to check.
* @returns {string} The filter list element for the given name.
*/
hasFilter(name) {
return this.#filterList[name];
}
} // class Filter
/**
* Threshold filter tool.
*/
export class Threshold {
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* @param {App} app The associated application.
*/
constructor(app) {
this.#app = app;
}
/**
* Associated filter.
*
* @type {object}
*/
#filter = new ThresholdFilter();
/**
* Flag to know wether to reset the image or not.
*
* @type {boolean}
*/
#resetImage = true;
/**
* Listener handler.
*
* @type {object}
*/
#listenerHandler = new ListenerHandler();
/**
* Activate the filter.
*
* @param {boolean} bool Flag to activate or not.
*/
activate(bool) {
// reset the image when the tool is activated
if (bool) {
this.#resetImage = true;
}
}
/**
* Initialise the filter. Called once the image is loaded.
*/
init() {
// does nothing
}
/**
* Run the filter.
*
* @param {*} args The filter arguments.
*/
run(args) {
this.#filter.setMin(args.min);
this.#filter.setMax(args.max);
// reset the image if asked
if (this.#resetImage) {
this.#filter.setOriginalImage(this.#app.getLastImage());
this.#resetImage = false;
}
const command = new RunFilterCommand(this.#filter, this.#app);
command.onExecute = this.#fireEvent;
command.onUndo = this.#fireEvent;
command.execute();
// save command in undo stack
this.#app.addToUndoStack(command);
}
/**
* Add an event listener to this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type, will be called with the fired event.
*/
addEventListener(type, callback) {
this.#listenerHandler.add(type, callback);
}
/**
* Remove an event listener from this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type.
*/
removeEventListener(type, callback) {
this.#listenerHandler.remove(type, callback);
}
/**
* Fire an event: call all associated listeners with the input event object.
*
* @param {object} event The event to fire.
*/
#fireEvent = (event) => {
this.#listenerHandler.fireEvent(event);
};
} // class Threshold
/**
* Sharpen filter tool.
*/
export class Sharpen {
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* @param {App} app The associated application.
*/
constructor(app) {
this.#app = app;
}
/**
* Listener handler.
*
* @type {object}
*/
#listenerHandler = new ListenerHandler();
/**
* Activate the filter.
*
* @param {boolean} _bool Flag to activate or not.
*/
activate(_bool) {
// does nothing
}
/**
* Initialise the filter. Called once the image is loaded.
*/
init() {
// does nothing
}
/**
* Run the filter.
*
* @param {*} _args The filter arguments.
*/
run(_args) {
const filter = new SharpenFilter();
filter.setOriginalImage(this.#app.getLastImage());
const command = new RunFilterCommand(filter, this.#app);
command.onExecute = this.#fireEvent;
command.onUndo = this.#fireEvent;
command.execute();
// save command in undo stack
this.#app.addToUndoStack(command);
}
/**
* Add an event listener to this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type, will be called with the fired event.
*/
addEventListener(type, callback) {
this.#listenerHandler.add(type, callback);
}
/**
* Remove an event listener from this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type.
*/
removeEventListener(type, callback) {
this.#listenerHandler.remove(type, callback);
}
/**
* Fire an event: call all associated listeners with the input event object.
*
* @param {object} event The event to fire.
*/
#fireEvent = (event) => {
this.#listenerHandler.fireEvent(event);
};
} // filter.Sharpen
/**
* Sobel filter tool.
*/
export class Sobel {
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* @param {App} app The associated application.
*/
constructor(app) {
this.#app = app;
}
/**
* Listener handler.
*
* @type {object}
*/
#listenerHandler = new ListenerHandler();
/**
* Activate the filter.
*
* @param {boolean} _bool Flag to activate or not.
*/
activate(_bool) {
// does nothing
}
/**
* Initialise the filter. Called once the image is loaded.
*/
init() {
// does nothing
}
/**
* Run the filter.
*
* @param {*} _args The filter arguments.
*/
run(_args) {
const filter = new SobelFilter();
filter.setOriginalImage(this.#app.getLastImage());
const command = new RunFilterCommand(filter, this.#app);
command.onExecute = this.#fireEvent;
command.onUndo = this.#fireEvent;
command.execute();
// save command in undo stack
this.#app.addToUndoStack(command);
}
/**
* Add an event listener to this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type, will be called with the fired event.
*/
addEventListener(type, callback) {
this.#listenerHandler.add(type, callback);
}
/**
* Remove an event listener from this class.
*
* @param {string} type The event type.
* @param {Function} callback The function associated with the provided
* event type.
*/
removeEventListener(type, callback) {
this.#listenerHandler.remove(type, callback);
}
/**
* Fire an event: call all associated listeners with the input event object.
*
* @param {object} event The event to fire.
*/
#fireEvent = (event) => {
this.#listenerHandler.fireEvent(event);
};
} // class filter.Sobel
/**
* Run filter command.
*/
export class RunFilterCommand {
/**
* The filter to run.
*
* @type {object}
*/
#filter;
/**
* Associated app.
*
* @type {App}
*/
#app;
/**
* @param {object} filter The filter to run.
* @param {App} app The associated application.
*/
constructor(filter, app) {
this.#filter = filter;
this.#app = app;
}
/**
* Get the command name.
*
* @returns {string} The command name.
*/
getName() {
return 'Filter-' + this.#filter.getName();
}
/**
* Execute the command.
*
* @fires RunFilterCommand#filterrun
*/
execute() {
// run filter and set app image
this.#app.setLastImage(this.#filter.update());
// update display
this.#app.render(0); //todo: fix
/**
* Filter run event.
*
* @event RunFilterCommand#filterrun
* @type {object}
* @property {string} type The event type: filterrun.
* @property {number} id The id of the run command.
*/
const event = {
type: 'filterrun',
id: this.getName()
};
// callback
this.onExecute(event);
}
/**
* Undo the command.
*
* @fires RunFilterCommand#filterundo
*/
undo() {
// reset the image
this.#app.setLastImage(this.#filter.getOriginalImage());
// update display
this.#app.render(0); //todo: fix
/**
* Filter undo event.
*
* @event RunFilterCommand#filterundo
* @type {object}
* @property {string} type The event type: filterundo.
* @property {number} id The id of the undone run command.
*/
const event = {
type: 'filterundo',
id: this.getName()
}; // callback
this.onUndo(event);
}
/**
* Handle an execute event.
*
* @param {object} _event The execute event with type and id.
*/
onExecute(_event) {
// default does nothing.
}
/**
* Handle an undo event.
*
* @param {object} _event The undo event with type and id.
*/
onUndo(_event) {
// default does nothing.
}
} // RunFilterCommand class