dbit-lu-angular-tree-component
Version:
A simple yet powerful tree component for Angular2
213 lines • 23.7 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { Injectable } from '@angular/core';
import { observable, computed, action, autorun, reaction } from 'mobx';
import { TreeModel } from './tree.model';
import { TREE_EVENTS } from '../constants/events';
var Y_OFFSET = 300; // Extra pixels outside the viewport, in each direction, to render nodes in
var Y_EPSILON = 50; // Minimum pixel change required to recalculate the rendered nodes
var TreeVirtualScroll = /** @class */ (function () {
function TreeVirtualScroll(treeModel) {
var _this = this;
this.treeModel = treeModel;
this.yBlocks = 0;
this.x = 0;
this.viewportHeight = null;
this.viewport = null;
treeModel.virtualScroll = this;
this._dispose = [autorun(function () { return _this.fixScroll(); })];
}
Object.defineProperty(TreeVirtualScroll.prototype, "y", {
get: function () {
return this.yBlocks * Y_EPSILON;
},
enumerable: true,
configurable: true
});
Object.defineProperty(TreeVirtualScroll.prototype, "totalHeight", {
get: function () {
return this.treeModel.virtualRoot ? this.treeModel.virtualRoot.height : 0;
},
enumerable: true,
configurable: true
});
TreeVirtualScroll.prototype.fireEvent = function (event) {
this.treeModel.fireEvent(event);
};
TreeVirtualScroll.prototype.init = function () {
var _this = this;
var fn = this.recalcPositions.bind(this);
fn();
this._dispose = this._dispose.concat([
reaction(function () { return _this.treeModel.roots; }, fn),
reaction(function () { return _this.treeModel.expandedNodeIds; }, fn),
reaction(function () { return _this.treeModel.hiddenNodeIds; }, fn)
]);
this.treeModel.subscribe(TREE_EVENTS.loadNodeChildren, fn);
};
TreeVirtualScroll.prototype.isEnabled = function () {
return this.treeModel.options.useVirtualScroll;
};
TreeVirtualScroll.prototype._setYBlocks = function (value) {
this.yBlocks = value;
};
TreeVirtualScroll.prototype.recalcPositions = function () {
this.treeModel.virtualRoot.height = this._getPositionAfter(this.treeModel.getVisibleRoots(), 0);
};
TreeVirtualScroll.prototype._getPositionAfter = function (nodes, startPos) {
var _this = this;
var position = startPos;
nodes.forEach(function (node) {
node.position = position;
position = _this._getPositionAfterNode(node, position);
});
return position;
};
TreeVirtualScroll.prototype._getPositionAfterNode = function (node, startPos) {
var position = node.getSelfHeight() + startPos;
if (node.children && node.isExpanded) {
position = this._getPositionAfter(node.visibleChildren, position);
}
node.height = position - startPos;
return position;
};
TreeVirtualScroll.prototype.clear = function () {
this._dispose.forEach(function (d) { return d(); });
};
TreeVirtualScroll.prototype.setViewport = function (viewport) {
Object.assign(this, {
viewport: viewport,
x: viewport.scrollLeft,
yBlocks: Math.round(viewport.scrollTop / Y_EPSILON),
viewportHeight: viewport.getBoundingClientRect().height
});
};
TreeVirtualScroll.prototype.scrollIntoView = function (node, force, scrollToMiddle) {
if (scrollToMiddle === void 0) { scrollToMiddle = true; }
if (force || // force scroll to node
node.position < this.y || // node is above viewport
node.position + node.getSelfHeight() > this.y + this.viewportHeight) {
if (this.viewport) {
this.viewport.scrollTop = scrollToMiddle ?
node.position - this.viewportHeight / 2 : // scroll to middle
node.position; // scroll to start
this._setYBlocks(Math.floor(this.viewport.scrollTop / Y_EPSILON));
}
}
};
TreeVirtualScroll.prototype.getViewportNodes = function (nodes) {
var _this = this;
if (!nodes)
return [];
var visibleNodes = nodes.filter(function (node) { return !node.isHidden; });
if (!this.isEnabled())
return visibleNodes;
if (!this.viewportHeight || !visibleNodes.length)
return [];
// Search for first node in the viewport using binary search
// Look for first node that starts after the beginning of the viewport (with buffer)
// Or that ends after the beginning of the viewport
var firstIndex = binarySearch(visibleNodes, function (node) {
return (node.position + Y_OFFSET > _this.y) ||
(node.position + node.height > _this.y);
});
// Search for last node in the viewport using binary search
// Look for first node that starts after the end of the viewport (with buffer)
var lastIndex = binarySearch(visibleNodes, function (node) {
return node.position - Y_OFFSET > _this.y + _this.viewportHeight;
}, firstIndex);
var viewportNodes = [];
for (var i = firstIndex; i <= lastIndex; i++) {
viewportNodes.push(visibleNodes[i]);
}
return viewportNodes;
};
TreeVirtualScroll.prototype.fixScroll = function () {
var maxY = Math.max(0, this.totalHeight - this.viewportHeight);
if (this.y < 0)
this._setYBlocks(0);
if (this.y > maxY)
this._setYBlocks(maxY / Y_EPSILON);
};
TreeVirtualScroll.decorators = [
{ type: Injectable },
];
/** @nocollapse */
TreeVirtualScroll.ctorParameters = function () { return [
{ type: TreeModel, },
]; };
__decorate([
observable,
__metadata("design:type", Object)
], TreeVirtualScroll.prototype, "yBlocks", void 0);
__decorate([
observable,
__metadata("design:type", Object)
], TreeVirtualScroll.prototype, "x", void 0);
__decorate([
observable,
__metadata("design:type", Object)
], TreeVirtualScroll.prototype, "viewportHeight", void 0);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeVirtualScroll.prototype, "y", null);
__decorate([
computed,
__metadata("design:type", Object),
__metadata("design:paramtypes", [])
], TreeVirtualScroll.prototype, "totalHeight", null);
__decorate([
action,
__metadata("design:type", Function),
__metadata("design:paramtypes", [Object]),
__metadata("design:returntype", void 0)
], TreeVirtualScroll.prototype, "_setYBlocks", null);
__decorate([
action,
__metadata("design:type", Function),
__metadata("design:paramtypes", []),
__metadata("design:returntype", void 0)
], TreeVirtualScroll.prototype, "recalcPositions", null);
__decorate([
action,
__metadata("design:type", Function),
__metadata("design:paramtypes", [Object]),
__metadata("design:returntype", void 0)
], TreeVirtualScroll.prototype, "setViewport", null);
__decorate([
action,
__metadata("design:type", Function),
__metadata("design:paramtypes", [Object, Object, Object]),
__metadata("design:returntype", void 0)
], TreeVirtualScroll.prototype, "scrollIntoView", null);
return TreeVirtualScroll;
}());
export { TreeVirtualScroll };
function binarySearch(nodes, condition, firstIndex) {
if (firstIndex === void 0) { firstIndex = 0; }
var index = firstIndex;
var toIndex = nodes.length - 1;
while (index !== toIndex) {
var midIndex = Math.floor((index + toIndex) / 2);
if (condition(nodes[midIndex])) {
toIndex = midIndex;
}
else {
if (index === midIndex)
index = toIndex;
else
index = midIndex;
}
}
return index;
}
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{ Injectable } from '@angular/core';\nimport { observable, computed, action, autorun, reaction } from 'mobx';\nimport { TreeModel } from './tree.model';\nimport { TREE_EVENTS } from '../constants/events';\n\nconst Y_OFFSET = 300; // Extra pixels outside the viewport, in each direction, to render nodes in\nconst Y_EPSILON = 50; // Minimum pixel change required to recalculate the rendered nodes\n\n\nexport class TreeVirtualScroll {\n  private _dispose: any;\n\n  @observable yBlocks = 0;\n  @observable x = 0;\n  @observable viewportHeight = null;\n  viewport = null;\n\n  @computed get y() {\n    return this.yBlocks * Y_EPSILON;\n  }\n\n  @computed get totalHeight() {\n    return this.treeModel.virtualRoot ? this.treeModel.virtualRoot.height : 0;\n  }\n\n  constructor(private treeModel: TreeModel) {\n    treeModel.virtualScroll = this;\n    this._dispose = [autorun(() => this.fixScroll())];\n  }\n\n  fireEvent(event) {\n    this.treeModel.fireEvent(event);\n  }\n\n  init() {\n    const fn = this.recalcPositions.bind(this);\n\n    fn();\n    this._dispose = [\n      ...this._dispose,\n      reaction(() => this.treeModel.roots, fn),\n      reaction(() => this.treeModel.expandedNodeIds, fn),\n      reaction(() => this.treeModel.hiddenNodeIds, fn)\n    ];\n    this.treeModel.subscribe(TREE_EVENTS.loadNodeChildren, fn);\n  }\n\n  isEnabled() {\n    return this.treeModel.options.useVirtualScroll;\n  }\n\n  @action private _setYBlocks(value) {\n    this.yBlocks = value;\n  }\n\n  @action recalcPositions() {\n    this.treeModel.virtualRoot.height = this._getPositionAfter(this.treeModel.getVisibleRoots(), 0);\n  }\n\n  private _getPositionAfter(nodes, startPos) {\n    let position = startPos;\n\n    nodes.forEach((node) => {\n      node.position = position;\n      position = this._getPositionAfterNode(node, position);\n    });\n    return position;\n  }\n\n  private _getPositionAfterNode(node, startPos) {\n    let position = node.getSelfHeight() + startPos;\n\n    if (node.children && node.isExpanded) { // TBD: consider loading component as well\n      position = this._getPositionAfter(node.visibleChildren, position);\n    }\n    node.height = position - startPos;\n    return position;\n  }\n\n\n  clear() {\n    this._dispose.forEach((d) => d());\n  }\n\n  @action setViewport(viewport) {\n    Object.assign(this, {\n      viewport,\n      x: viewport.scrollLeft,\n      yBlocks: Math.round(viewport.scrollTop / Y_EPSILON),\n      viewportHeight: viewport.getBoundingClientRect().height\n    });\n  }\n\n  @action scrollIntoView(node, force, scrollToMiddle = true) {\n    if (force || // force scroll to node\n      node.position < this.y || // node is above viewport\n      node.position + node.getSelfHeight() > this.y + this.viewportHeight) { // node is below viewport\n      if (this.viewport) {\n        this.viewport.scrollTop = scrollToMiddle ?\n          node.position - this.viewportHeight / 2 : // scroll to middle\n          node.position; // scroll to start\n\n        this._setYBlocks(Math.floor(this.viewport.scrollTop / Y_EPSILON));\n      }\n    }\n  }\n\n  getViewportNodes(nodes) {\n    if (!nodes) return [];\n\n    const visibleNodes = nodes.filter((node) => !node.isHidden);\n\n    if (!this.isEnabled()) return visibleNodes;\n\n    if (!this.viewportHeight || !visibleNodes.length) return [];\n\n    // Search for first node in the viewport using binary search\n    // Look for first node that starts after the beginning of the viewport (with buffer)\n    // Or that ends after the beginning of the viewport\n    const firstIndex = binarySearch(visibleNodes, (node) => {\n      return (node.position + Y_OFFSET > this.y) ||\n             (node.position + node.height > this.y);\n    });\n\n    // Search for last node in the viewport using binary search\n    // Look for first node that starts after the end of the viewport (with buffer)\n    const lastIndex = binarySearch(visibleNodes, (node) => {\n      return node.position - Y_OFFSET > this.y + this.viewportHeight;\n    }, firstIndex);\n\n    const viewportNodes = [];\n    for (let i = firstIndex; i <= lastIndex; i++) {\n      viewportNodes.push(visibleNodes[i]);\n    }\n\n    return viewportNodes;\n  }\n\n  fixScroll() {\n    const maxY = Math.max(0, this.totalHeight - this.viewportHeight);\n\n    if (this.y < 0) this._setYBlocks(0);\n    if (this.y > maxY) this._setYBlocks(maxY / Y_EPSILON);\n  }\nstatic decorators: DecoratorInvocation[] = [\n{ type: Injectable },\n];\n/** @nocollapse */\nstatic ctorParameters: () => ({type: any, decorators?: DecoratorInvocation[]}|null)[] = () => [\n{type: TreeModel, },\n];\n}\n\nfunction binarySearch(nodes, condition, firstIndex = 0) {\n  let index = firstIndex;\n  let toIndex = nodes.length - 1;\n\n  while (index !== toIndex) {\n    let midIndex = Math.floor((index + toIndex) / 2);\n\n    if (condition(nodes[midIndex])) {\n      toIndex = midIndex;\n    }\n    else {\n      if (index === midIndex) index = toIndex;\n      else index = midIndex;\n    }\n  }\n  return index;\n}\n\ninterface DecoratorInvocation {\n  type: Function;\n  args?: any[];\n}\n"]}