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view-util.ts
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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;
}
}