nativescript-angular/nativescript-angular/view-util.ts at master · NativeScript/nativescript-angular · GitHub

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import { View, unsetValue, Placeholder, ContentView, LayoutBase, platformNames, Device } from '@nativescript/core';

import { CommentNode, InvisibleNode, NgView, TextNode, ViewExtensions, getViewClass, getViewMeta, isDetachedElement, isInvisibleNode, isKnownView, isView } from './element-registry';

import { NativeScriptDebug } from './trace';

const ELEMENT_NODE_TYPE = 1;

const XML_ATTRIBUTES = Object.freeze(['style', 'rows', 'columns', 'fontAttributes']);

const whiteSpaceSplitter = /\s+/;

// export type ViewExtensions = ViewExtensions;

// export type NgView = NgView;

export type NgLayoutBase = LayoutBase & ViewExtensions;

export type NgContentView = ContentView & ViewExtensions;

export type NgPlaceholder = Placeholder & ViewExtensions;

export type BeforeAttachAction = (view: View) => void;

export function isLayout(view: any): view is NgLayoutBase {

return view instanceof LayoutBase;

}

export function isContentView(view: any): view is NgContentView {

return view instanceof ContentView;

}

const propertyMaps: Map<Function, Map<string, string>> = new Map<Function, Map<string, string>>();

export class ViewUtil {

private isIos: boolean;

private isAndroid: boolean;

constructor(device: typeof Device) {

this.isIos = device.os === platformNames.ios;

this.isAndroid = device.os === platformNames.android;

}

public insertChild(parent: View, child: View, previous?: NgView, next?: NgView) {

if (!parent) {

return;

}

const extendedParent = this.ensureNgViewExtensions(parent);

const extendedChild = this.ensureNgViewExtensions(child);

// the element should be between previous and next

// if there's next but no previous, it's the first element

// if there's previous but no next, it's the last element

// elements that have no previous/next elements must be appended

if (!previous && !next) {

previous = extendedParent.lastChild;

}

this.addToQueue(extendedParent, extendedChild, previous, next);

if (isInvisibleNode(child)) {

extendedChild.parentNode = extendedParent;

}

if (!isDetachedElement(child)) {

const nextVisual = this.findNextVisual(next);

this.addToVisualTree(extendedParent, extendedChild, nextVisual);

}

private addToQueue(parent: NgView, child: NgView, previous: NgView, next: NgView): void {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.addToQueue parent: ${parent}, view: ${child}, ` + `previous: ${previous}, next: ${next}`);

}

if (previous) {

previous.nextSibling = child;

child.previousSibling = previous;

} else {

parent.firstChild = child;

}

if (next) {

child.nextSibling = next;

next.previousSibling = child;

} else {

this.appendToQueue(parent, child);

}

private appendToQueue(parent: NgView, view: NgView) {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.appendToQueue parent: ${parent} view: ${view}`);

}

if (parent.lastChild) {

parent.lastChild.nextSibling = view;

view.previousSibling = parent.lastChild;

}

parent.lastChild = view;

}

private addToVisualTree(parent: NgView, child: NgView, next: NgView): void {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.addToVisualTree parent: ${parent}, view: ${child}, next: ${next}`);

}

if (parent.meta && parent.meta.insertChild) {

parent.meta.insertChild(parent, child, next);

} else if (isLayout(parent)) {

this.insertToLayout(parent, child, next);

} else if (isContentView(parent)) {

parent.content = child;

} else if (parent && (<any>parent)._addChildFromBuilder) {

(<any>parent)._addChildFromBuilder(child.nodeName, child);

}

private insertToLayout(parent: NgLayoutBase, child: NgView, next: NgView): void {

if (child.parent === parent) {

this.removeLayoutChild(parent, child);

}

const nextVisual = this.findNextVisual(next);

if (nextVisual) {

const index = parent.getChildIndex(nextVisual);

parent.insertChild(child, index);

} else {

parent.addChild(child);

}

private findNextVisual(view: NgView): NgView {

let next = view;

while (next && isDetachedElement(next)) {

next = next.nextSibling;

}

return next;

}

public removeChild(parent: View, child: View) {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.removeChild parent: ${parent} child: ${child}`);

}

if (!parent) {

return;

}

const extendedParent = this.ensureNgViewExtensions(parent);

const extendedChild = this.ensureNgViewExtensions(child);

this.removeFromQueue(extendedParent, extendedChild);

if (!isDetachedElement(extendedChild)) {

this.removeFromVisualTree(extendedParent, extendedChild);

}

private removeFromQueue(parent: NgView, child: NgView) {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.removeFromQueue parent: ${parent} child: ${child}`);

}

if (parent.firstChild === child && parent.lastChild === child) {

parent.firstChild = null;

parent.lastChild = null;

child.nextSibling = null;

child.previousSibling = null;

return;

}

if (parent.firstChild === child) {

parent.firstChild = child.nextSibling;

}

const previous = child.previousSibling;

if (parent.lastChild === child) {

parent.lastChild = previous;

}

if (previous) {

previous.nextSibling = child.nextSibling;

if (child.nextSibling) {

child.nextSibling.previousSibling = previous;

}

child.nextSibling = null;

child.previousSibling = null;

}

// NOTE: This one is O(n) - use carefully

private findPreviousElement(parent: NgView, child: NgView): NgView {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.findPreviousElement parent: ${parent} child: ${child}`);

}

let previousVisual;

if (isLayout(parent)) {

previousVisual = this.getPreviousVisualElement(parent, child);

}

let previous = previousVisual || parent.firstChild;

// since detached elements are not added to the visual tree,

// we need to find the actual previous sibling of the view,

// which may as well be an invisible node

while (previous && previous !== child && previous.nextSibling !== child) {

previous = previous.nextSibling;

}

return previous;

}

private getPreviousVisualElement(parent: NgLayoutBase, child: NgView): NgView {

const elementIndex = parent.getChildIndex(child);

if (elementIndex > 0) {

return parent.getChildAt(elementIndex - 1) as NgView;

}

// NOTE: This one is O(n) - use carefully

public getChildIndex(parent: any, child: NgView) {

if (isLayout(parent)) {

return parent.getChildIndex(child);

} else if (isContentView(parent)) {

return child === parent.content ? 0 : -1;

}

private removeFromVisualTree(parent: NgView, child: NgView) {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.removeFromVisualTree parent: ${parent} child: ${child}`);

}

if (parent.meta && parent.meta.removeChild) {

parent.meta.removeChild(parent, child);

} else if (isLayout(parent)) {

this.removeLayoutChild(parent, child);

} else if (isContentView(parent) && parent.content === child) {

parent.content = null;

} else if (isView(parent)) {

parent._removeView(child);

}

private removeLayoutChild(parent: NgLayoutBase, child: NgView): void {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`ViewUtil.removeLayoutChild parent: ${parent} child: ${child}`);

}

const index = parent.getChildIndex(child);

if (index !== -1) {

parent.removeChild(child);

}

public createComment(): InvisibleNode {

return new CommentNode();

}

public createText(): InvisibleNode {

return new TextNode();

}

public createView(name: string): NgView {

const originalName = name;

if (!isKnownView(name)) {

name = 'ProxyViewContainer';

}

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`Creating view: ${originalName} ${name}`);

}

const viewClass = getViewClass(name);

const view = <NgView>new viewClass();

const ngView = this.setNgViewExtensions(view, name);

return ngView;

}

private ensureNgViewExtensions(view: View): NgView {

if (view.hasOwnProperty('meta')) {

return view as NgView;

} else {

const name = view.cssType;

const ngView = this.setNgViewExtensions(view, name);

return ngView;

}

private setNgViewExtensions(view: View, name: string): NgView {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`Make into a NgView view: ${view} name: "${name}"`);

}

const ngView = view as NgView;

ngView.nodeName = name;

ngView.meta = getViewMeta(name);

// we're setting the node type of the view

// to 'element' because of checks done in the

// dom animation engine

ngView.nodeType = ELEMENT_NODE_TYPE;

return ngView;

}

public setProperty(view: NgView, attributeName: string, value: any, namespace?: string): void {

if (!view || (namespace && !this.runsIn(namespace))) {

return;

}

if (attributeName.indexOf('.') !== -1) {

// Handle nested properties

const properties = attributeName.split('.');

attributeName = properties[properties.length - 1];

let propMap = this.getProperties(view);

let i = 0;

while (i < properties.length - 1 && typeof view !== 'undefined') {

let prop = properties[i];

if (propMap.has(prop)) {

prop = propMap.get(prop);

}

view = view[prop];

propMap = this.getProperties(view);

i++;

}

if (typeof view !== 'undefined') {

this.setPropertyInternal(view, attributeName, value);

}

private runsIn(platform: string): boolean {

return (platform === 'ios' && this.isIos) || (platform === 'android' && this.isAndroid);

}

private setPropertyInternal(view: NgView, attributeName: string, value: any): void {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`Setting attribute: ${attributeName}=${value} to ${view}`);

}

if (attributeName === 'class') {

this.setClasses(view, value);

return;

}

if (XML_ATTRIBUTES.indexOf(attributeName) !== -1) {

view[attributeName] = value;

return;

}

const propMap = this.getProperties(view);

const propertyName = propMap.get(attributeName);

// Ensure the children of a collection currently have no parent set.

if (Array.isArray(value)) {

this.removeParentReferencesFromItems(value);

}

if (propertyName) {

// We have a lower-upper case mapped property.

view[propertyName] = value;

return;

}

// Unknown attribute value -- just set it to our object as is.

view[attributeName] = value;

}

private removeParentReferencesFromItems(items: any[]): void {

for (const item of items) {

if (item.parent && item.parentNode) {

if (NativeScriptDebug.isLogEnabled()) {

NativeScriptDebug.viewUtilLog(`Unassigning parent ${item.parentNode} on value: ${item}`);

}

item.parent = undefined;

item.parentNode = undefined;

}

private getProperties(instance: any): Map<string, string> {

const type = instance && instance.constructor;

if (!type) {

return new Map<string, string>();

}

if (!propertyMaps.has(type)) {

let propMap = new Map<string, string>();

for (let propName in instance) {

// tslint:disable:forin

propMap.set(propName.toLowerCase(), propName);

}

propertyMaps.set(type, propMap);

}

return propertyMaps.get(type);

}

private cssClasses(view: NgView) {

if (!view.ngCssClasses) {

view.ngCssClasses = new Map<string, boolean>();

}

return view.ngCssClasses;

}

public addClass(view: NgView, className: string): void {

this.cssClasses(view).set(className, true);

this.syncClasses(view);

}

public removeClass(view: NgView, className: string): void {

this.cssClasses(view).delete(className);

this.syncClasses(view);

}

private setClasses(view: NgView, classesValue: string): void {

let classes = classesValue.split(whiteSpaceSplitter);

this.cssClasses(view).clear();

classes.forEach((className) => this.cssClasses(view).set(className, true));

this.syncClasses(view);

}

private syncClasses(view: NgView): void {

let classValue = (<any>Array).from(this.cssClasses(view).keys()).join(' ');

view.className = classValue;

}

public setStyle(view: NgView, styleName: string, value: any) {

view.style[styleName] = value;

}

public removeStyle(view: NgView, styleName: string) {

view.style[styleName] = unsetValue;

}

nativescript-angular/nativescript-angular/view-util.ts at master · NativeScript/nativescript-angular · GitHub

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nativescript-angular/nativescript-angular/view-util.ts at master · NativeScript/nativescript-angular · GitHub

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