80 lines
3.7 KiB
JavaScript
80 lines
3.7 KiB
JavaScript
/* Interactive elements
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* Copyright 2016 Harmen de Weerd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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function addMouseTracker(elem) {
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elem.mouse = {x : 0, y : 0, buttons : 0, targetElement : null, hasFocus: false};
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elem.mouse.interactiveElements = [];
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elem.getInteractiveElement = findElement;
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elem.addEventListener("mousedown",
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elem.mouse.downListener = function(event) {
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this.mouse.buttons = event.buttons;
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this.mouse.x = event.offsetX;
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this.mouse.y = event.offsetY;
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this.mouse.targetElement = this.getInteractiveElement(event.offsetX, event.offsetY);
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if (this.mouse.targetElement != null) {
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this.mouse.targetElement.startAction(event);
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}
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});
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elem.addEventListener("mouseup",
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elem.mouse.upListener = function(event) {
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this.mouse.buttons = event.buttons;
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if (this.mouse.targetElement != null) {
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this.mouse.targetElement.endAction(event);
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this.mouse.targetElement = null;
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}
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});
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elem.addEventListener("mousemove",
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elem.mouse.moveListener = function(event) {
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this.mouse.hasFocus = true;
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this.mouse.x = event.offsetX;
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this.mouse.y = event.offsetY;
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if (this.mouse.targetElement != null) {
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this.mouse.targetElement.continueAction(event);
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} else {
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var interactiveElement = this.getInteractiveElement(event.offsetX, event.offsetY);
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if (interactiveElement != null) {
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this.style.cursor = interactiveElement.getActionLabel(event.offsetX - interactiveElement.x, event.offsetY - interactiveElement.y);
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} else {
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this.style.cursor = "initial";
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}
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}
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});
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elem.addEventListener("mouseout",
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elem.mouse.outListener = function(event) {
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this.mouse.hasFocus = false;
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});
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elem.addInteractiveElement = function(obj) {
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if (!obj.mouseHit) obj.mouseHit = mouseHit
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this.mouse.interactiveElements.push(obj);
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elem.removeMouseTracker = function() {
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elem.removeEventListener("mousedown", this.mouse.downListener)
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elem.removeEventListener("mouseup", this.mouse.upListener)
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elem.removeEventListener("mousemove", this.mouse.moveListener)
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elem.removeEventListener("mouseout", this.mouse.outListener)
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delete elem.mouse
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}
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};
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}
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function mouseHit(x, y) {
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return (x < this.x + this.getWidth() && x > this.x &&
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y < this.y + this.getHeight() && y > this.y)
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}
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function findElement(x, y) {
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return this.mouse.interactiveElements.find(elem => elem.mouseHit(x, y))
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}
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