315 lines
41 KiB
JavaScript
315 lines
41 KiB
JavaScript
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export class GridsterPush {
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constructor(gridsterItem) {
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this.iteration = 0;
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this.pushedItems = [];
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this.pushedItemsTemp = [];
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this.pushedItemsTempPath = [];
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this.pushedItemsPath = [];
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this.gridsterItem = gridsterItem;
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this.gridster = gridsterItem.gridster;
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this.tryPattern = {
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fromEast: [this.tryWest, this.trySouth, this.tryNorth, this.tryEast],
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fromWest: [this.tryEast, this.trySouth, this.tryNorth, this.tryWest],
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fromNorth: [this.trySouth, this.tryEast, this.tryWest, this.tryNorth],
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fromSouth: [this.tryNorth, this.tryEast, this.tryWest, this.trySouth]
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};
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this.fromSouth = 'fromSouth';
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this.fromNorth = 'fromNorth';
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this.fromEast = 'fromEast';
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this.fromWest = 'fromWest';
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}
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destroy() {
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this.gridster = this.gridsterItem = null;
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}
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pushItems(direction, disable) {
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if (this.gridster.$options.pushItems && !disable) {
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this.pushedItemsOrder = [];
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this.iteration = 0;
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const pushed = this.push(this.gridsterItem, direction);
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if (!pushed) {
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this.restoreTempItems();
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}
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this.pushedItemsOrder = [];
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this.pushedItemsTemp = [];
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this.pushedItemsTempPath = [];
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return pushed;
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}
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else {
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return false;
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}
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}
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restoreTempItems() {
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let i = this.pushedItemsTemp.length - 1;
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for (; i > -1; i--) {
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this.removeFromTempPushed(this.pushedItemsTemp[i]);
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}
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}
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restoreItems() {
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let i = 0;
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const l = this.pushedItems.length;
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let pushedItem;
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for (; i < l; i++) {
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pushedItem = this.pushedItems[i];
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pushedItem.$item.x = pushedItem.item.x || 0;
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pushedItem.$item.y = pushedItem.item.y || 0;
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pushedItem.setSize();
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}
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this.pushedItems = [];
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this.pushedItemsPath = [];
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}
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setPushedItems() {
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let i = 0;
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const l = this.pushedItems.length;
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let pushedItem;
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for (; i < l; i++) {
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pushedItem = this.pushedItems[i];
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pushedItem.checkItemChanges(pushedItem.$item, pushedItem.item);
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}
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this.pushedItems = [];
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this.pushedItemsPath = [];
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}
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checkPushBack() {
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let i = this.pushedItems.length - 1;
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let change = false;
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for (; i > -1; i--) {
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if (this.checkPushedItem(this.pushedItems[i], i)) {
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change = true;
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}
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}
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if (change) {
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this.checkPushBack();
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}
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}
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push(gridsterItem, direction) {
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if (this.iteration > 100) {
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console.warn('max iteration reached');
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return false;
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}
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if (this.gridster.checkGridCollision(gridsterItem.$item)) {
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return false;
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}
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if (direction === '') {
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return false;
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}
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const conflicts = this.gridster.findItemsWithItem(gridsterItem.$item);
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const invert = direction === this.fromNorth || direction === this.fromWest;
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// sort the list of conflicts in order of [y,x]. Invert when the push is from north and west
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// this is done so they don't conflict witch each other and revert positions, keeping the previous order
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conflicts.sort((a, b) => {
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if (invert) {
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return b.$item.y - a.$item.y || b.$item.x - a.$item.x;
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}
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else {
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return a.$item.y - b.$item.y || a.$item.x - b.$item.x;
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}
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});
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let i = 0;
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let itemCollision;
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let makePush = true;
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const pushedItems = [];
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for (; i < conflicts.length; i++) {
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itemCollision = conflicts[i];
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if (itemCollision === this.gridsterItem) {
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continue;
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}
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if (!itemCollision.canBeDragged()) {
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makePush = false;
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break;
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}
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const p = this.pushedItemsTemp.indexOf(itemCollision);
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if (p > -1 && this.pushedItemsTempPath[p].length > 10) {
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// stop if item is pushed more than 10 times to break infinite loops
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makePush = false;
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break;
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}
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if (this.tryPattern[direction][0].call(this, itemCollision, gridsterItem)) {
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this.pushedItemsOrder.push(itemCollision);
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pushedItems.push(itemCollision);
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}
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else if (this.tryPattern[direction][1].call(this, itemCollision, gridsterItem)) {
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this.pushedItemsOrder.push(itemCollision);
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pushedItems.push(itemCollision);
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}
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else if (this.tryPattern[direction][2].call(this, itemCollision, gridsterItem)) {
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this.pushedItemsOrder.push(itemCollision);
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pushedItems.push(itemCollision);
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}
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else if (this.tryPattern[direction][3].call(this, itemCollision, gridsterItem)) {
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this.pushedItemsOrder.push(itemCollision);
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pushedItems.push(itemCollision);
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}
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else {
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makePush = false;
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break;
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}
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}
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if (!makePush) {
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i = this.pushedItemsOrder.lastIndexOf(pushedItems[0]);
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if (i > -1) {
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let j = this.pushedItemsOrder.length - 1;
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for (; j >= i; j--) {
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itemCollision = this.pushedItemsOrder[j];
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this.pushedItemsOrder.pop();
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this.removeFromTempPushed(itemCollision);
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this.removeFromPushedItem(itemCollision);
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}
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}
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}
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this.iteration++;
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return makePush;
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}
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trySouth(gridsterItemCollide, gridsterItem) {
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if (!this.gridster.$options.pushDirections.south) {
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return false;
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}
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this.addToTempPushed(gridsterItemCollide);
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gridsterItemCollide.$item.y =
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gridsterItem.$item.y + gridsterItem.$item.rows;
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if (this.push(gridsterItemCollide, this.fromNorth)) {
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gridsterItemCollide.setSize();
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this.addToPushed(gridsterItemCollide);
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return true;
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}
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else {
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this.removeFromTempPushed(gridsterItemCollide);
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}
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return false;
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}
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tryNorth(gridsterItemCollide, gridsterItem) {
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if (!this.gridster.$options.pushDirections.north) {
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return false;
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}
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this.addToTempPushed(gridsterItemCollide);
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gridsterItemCollide.$item.y =
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gridsterItem.$item.y - gridsterItemCollide.$item.rows;
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if (this.push(gridsterItemCollide, this.fromSouth)) {
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gridsterItemCollide.setSize();
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this.addToPushed(gridsterItemCollide);
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return true;
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}
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else {
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this.removeFromTempPushed(gridsterItemCollide);
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}
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return false;
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}
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tryEast(gridsterItemCollide, gridsterItem) {
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if (!this.gridster.$options.pushDirections.east) {
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return false;
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}
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this.addToTempPushed(gridsterItemCollide);
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gridsterItemCollide.$item.x =
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gridsterItem.$item.x + gridsterItem.$item.cols;
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if (this.push(gridsterItemCollide, this.fromWest)) {
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gridsterItemCollide.setSize();
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this.addToPushed(gridsterItemCollide);
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return true;
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}
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else {
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this.removeFromTempPushed(gridsterItemCollide);
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}
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return false;
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}
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tryWest(gridsterItemCollide, gridsterItem) {
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if (!this.gridster.$options.pushDirections.west) {
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return false;
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}
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this.addToTempPushed(gridsterItemCollide);
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gridsterItemCollide.$item.x =
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gridsterItem.$item.x - gridsterItemCollide.$item.cols;
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if (this.push(gridsterItemCollide, this.fromEast)) {
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gridsterItemCollide.setSize();
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this.addToPushed(gridsterItemCollide);
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return true;
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}
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else {
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this.removeFromTempPushed(gridsterItemCollide);
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}
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return false;
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}
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addToTempPushed(gridsterItem) {
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let i = this.pushedItemsTemp.indexOf(gridsterItem);
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if (i === -1) {
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i = this.pushedItemsTemp.push(gridsterItem) - 1;
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this.pushedItemsTempPath[i] = [];
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}
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this.pushedItemsTempPath[i].push({
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x: gridsterItem.$item.x,
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y: gridsterItem.$item.y
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});
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}
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removeFromTempPushed(gridsterItem) {
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const i = this.pushedItemsTemp.indexOf(gridsterItem);
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const tempPosition = this.pushedItemsTempPath[i].pop();
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if (!tempPosition) {
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return;
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}
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gridsterItem.$item.x = tempPosition.x;
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gridsterItem.$item.y = tempPosition.y;
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gridsterItem.setSize();
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if (!this.pushedItemsTempPath[i].length) {
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this.pushedItemsTemp.splice(i, 1);
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this.pushedItemsTempPath.splice(i, 1);
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}
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}
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addToPushed(gridsterItem) {
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if (this.pushedItems.indexOf(gridsterItem) < 0) {
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this.pushedItems.push(gridsterItem);
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this.pushedItemsPath.push([
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{ x: gridsterItem.item.x || 0, y: gridsterItem.item.y || 0 },
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{ x: gridsterItem.$item.x, y: gridsterItem.$item.y }
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]);
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}
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else {
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const i = this.pushedItems.indexOf(gridsterItem);
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this.pushedItemsPath[i].push({
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x: gridsterItem.$item.x,
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y: gridsterItem.$item.y
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});
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}
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}
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removeFromPushed(i) {
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if (i > -1) {
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this.pushedItems.splice(i, 1);
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this.pushedItemsPath.splice(i, 1);
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}
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}
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removeFromPushedItem(gridsterItem) {
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const i = this.pushedItems.indexOf(gridsterItem);
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if (i > -1) {
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this.pushedItemsPath[i].pop();
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if (!this.pushedItemsPath.length) {
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this.pushedItems.splice(i, 1);
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this.pushedItemsPath.splice(i, 1);
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}
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}
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}
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checkPushedItem(pushedItem, i) {
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const path = this.pushedItemsPath[i];
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let j = path.length - 2;
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let lastPosition;
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let x;
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let y;
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let change = false;
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for (; j > -1; j--) {
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lastPosition = path[j];
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x = pushedItem.$item.x;
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y = pushedItem.$item.y;
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pushedItem.$item.x = lastPosition.x;
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pushedItem.$item.y = lastPosition.y;
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if (!this.gridster.findItemWithItem(pushedItem.$item)) {
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pushedItem.setSize();
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path.splice(j + 1, path.length - j - 1);
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change = true;
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}
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else {
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pushedItem.$item.x = x;
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pushedItem.$item.y = y;
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}
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}
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if (path.length < 2) {
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this.removeFromPushed(i);
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}
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return change;
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}
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}
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