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ngf.directive.ts
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ngf.directive.ts
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import { Directive, EventEmitter, ElementRef, Input, Output, HostListener, SimpleChanges } from '@angular/core';
import { createInvisibleFileInputWrap, isFileInput, detectSwipe } from "./doc-event-help.functions"
import {
acceptType, InvalidFileItem,
applyExifRotation, dataUrl
} from "./fileTools"
export interface dragMeta{
type:string
kind:string
}
/** A master base set of logic intended to support file select/drag/drop operations
NOTE: Use ngfDrop for full drag/drop. Use ngfSelect for selecting
*/
@Directive({
selector: "[ngf]",
exportAs:"ngf"
})
export class ngf {
fileElm: any
filters: {name: string, fn: (file:File)=>boolean}[] = []
lastFileCount: number = 0
@Input() multiple !:string
@Input() accept !:string
@Input() maxSize !:number
@Input() ngfFixOrientation: boolean = true
@Input() fileDropDisabled: boolean = false
@Input() selectable: boolean | string = false
@Output('init') directiveInit:EventEmitter<ngf> = new EventEmitter()
@Input() lastInvalids:InvalidFileItem[] = []
@Output() lastInvalidsChange:EventEmitter<{file:File,type:string}[]> = new EventEmitter()
@Input() lastBaseUrl!: string//base64 last file uploaded url
@Output() lastBaseUrlChange:EventEmitter<string> = new EventEmitter()
@Input() file?: File//last file uploaded
@Output() fileChange: EventEmitter<File> = new EventEmitter()
@Input() files:File[] = []
@Output() filesChange:EventEmitter<File[]> = new EventEmitter<File[]>();
@Output() fileSelectStart:EventEmitter<Event> = new EventEmitter()
@Input() capturePaste: boolean // window paste file watching (empty string turns on)
pasteCapturer!: (e: Event) => void // goes with capturePaste
constructor(public element:ElementRef){
this.initFilters()
}
initFilters(){
// the order is important
this.filters.push({name: 'accept', fn: this._acceptFilter})
this.filters.push({name: 'fileSize', fn: this._fileSizeFilter})
//this.filters.push({name: 'fileType', fn: this._fileTypeFilter})
//this.filters.push({name: 'queueLimit', fn: this._queueLimitFilter})
//this.filters.push({name: 'mimeType', fn: this._mimeTypeFilter})
}
ngOnDestroy(){
delete this.fileElm//faster memory release of dom element
this.destroyPasteListener();
}
ngOnInit(){
const selectable = (this.selectable || this.selectable==='') && !['false', 'null', '0'].includes(this.selectable as string);
if( selectable ){
this.enableSelecting()
}
if( this.multiple ){
this.paramFileElm().setAttribute('multiple', this.multiple)
}
this.evalCapturePaste();
// create reference to this class with one cycle delay to avoid ExpressionChangedAfterItHasBeenCheckedError
setTimeout(()=>{
this.directiveInit.emit(this)
}, 0)
}
ngOnChanges( changes: SimpleChanges ){
if( changes.accept ){
this.paramFileElm().setAttribute('accept', changes.accept.currentValue || '*')
}
if (changes.capturePaste) {
this.evalCapturePaste();
}
// Did we go from having a file to not having a file? Clear file element then
if (changes.file && changes.file.previousValue && !changes.file.currentValue) {
this.clearFileElmValue()
}
// Did we go from having files to not having files? Clear file element then
if (changes.files) {
const filesWentToZero = changes.files.previousValue?.length && !changes.files.currentValue?.length
if (filesWentToZero) {
this.clearFileElmValue()
}
}
}
evalCapturePaste() {
const isActive = this.capturePaste || (this.capturePaste as any)==='' || ['false', '0', 'null'].includes(this.capturePaste as any);
if (isActive) {
if (this.pasteCapturer) {
return; // already listening
}
this.pasteCapturer = (e: Event) => {
const clip = (e as any).clipboardData;
if (clip && clip.files && clip.files.length) {
this.handleFiles(clip.files);
e.preventDefault();
}
}
window.addEventListener('paste', this.pasteCapturer);
return;
}
this.destroyPasteListener();
}
destroyPasteListener() {
if (this.pasteCapturer) {
window.removeEventListener('paste', this.pasteCapturer);
delete this.pasteCapturer;
}
}
paramFileElm(){
if( this.fileElm )return this.fileElm // already defined
// elm already is a file input
const isFile = isFileInput( this.element.nativeElement )
if(isFile){
return this.fileElm = this.element.nativeElement
}
// the host elm is NOT a file input
return this.fileElm = this.createFileElm({
change: this.changeFn.bind(this)
})
}
/** Only used when host element we are attached to is NOT a fileElement */
createFileElm({change}: {change:() => any}) {
// use specific technique to hide file element within
const label = createInvisibleFileInputWrap()
const fileElm = label.getElementsByTagName('input')[0]
fileElm.addEventListener('change', change);
this.element.nativeElement.appendChild( label ) // put on html stage
return fileElm
}
enableSelecting(){
let elm = this.element.nativeElement
if( isFileInput(elm) ){
const bindedHandler = event => this.beforeSelect(event)
elm.addEventListener('click', bindedHandler)
elm.addEventListener('touchstart', bindedHandler)
return
}
const bindedHandler = ev => this.clickHandler(ev)
elm.addEventListener('click', bindedHandler)
elm.addEventListener('touchstart', bindedHandler)
elm.addEventListener('touchend', bindedHandler)
}
getValidFiles( files:File[] ):File[]{
const rtn:File[] = []
for(let x=files.length-1; x >= 0; --x){
if( this.isFileValid(files[x]) ){
rtn.push( files[x] )
}
}
return rtn
}
getInvalidFiles(files:File[]):InvalidFileItem[]{
const rtn:InvalidFileItem[] = []
for(let x=files.length-1; x >= 0; --x){
let failReason = this.getFileFilterFailName(files[x])
if( failReason ){
rtn.push({
file : files[x],
type : failReason
})
}
}
return rtn
}
// Primary handler of files coming in
handleFiles(files:File[]){
const valids = this.getValidFiles(files)
if(files.length!=valids.length){
this.lastInvalids = this.getInvalidFiles(files)
}else{
delete this.lastInvalids
}
this.lastInvalidsChange.emit(this.lastInvalids)
if( valids.length ){
if( this.ngfFixOrientation ){
this.applyExifRotations(valids)
.then( fixedFiles=>this.que(fixedFiles) )
}else{
this.que(valids)
}
}
if (this.isEmptyAfterSelection()) {
this.element.nativeElement.value = ''
}
}
que( files:File[] ){
this.files = this.files || []
Array.prototype.push.apply(this.files, files)
//below break memory ref and doesnt act like a que
//this.files = files//causes memory change which triggers bindings like <ngfFormData [files]="files"></ngfFormData>
this.filesChange.emit( this.files )
if(files.length){
this.fileChange.emit( this.file=files[0] )
if(this.lastBaseUrlChange.observers.length){
dataUrl( files[0] )
.then( url=>this.lastBaseUrlChange.emit(url) )
}
}
//will be checked for input value clearing
this.lastFileCount = this.files.length
}
/** called when input has files */
changeFn(event:any) {
var fileList = event.__files_ || (event.target && event.target.files)
if (!fileList) return;
this.stopEvent(event);
this.handleFiles(fileList)
}
clickHandler(evt: Event){
const elm = this.element.nativeElement
if (elm.getAttribute('disabled') || this.fileDropDisabled){
return false;
}
var r = detectSwipe(evt);
// prevent the click if it is a swipe
if ( r!==false ) return r;
const fileElm = this.paramFileElm()
fileElm.click()
//fileElm.dispatchEvent( new Event('click') );
this.beforeSelect(evt)
return false;
}
beforeSelect(event: Event){
this.fileSelectStart.emit(event)
if( this.files && this.lastFileCount===this.files.length )return
// if no files in array, be sure browser does not prevent reselect of same file (see github issue 27)
this.clearFileElmValue()
}
clearFileElmValue() {
if (!this.fileElm) return
this.fileElm.value = null
}
isEmptyAfterSelection():boolean {
return !!this.element.nativeElement.attributes.multiple;
}
stopEvent(event:any):any {
event.preventDefault();
event.stopPropagation();
}
transferHasFiles(transfer:any):any {
if (!transfer.types) {
return false;
}
if (transfer.types.indexOf) {
return transfer.types.indexOf('Files') !== -1;
} else if (transfer.types.contains) {
return transfer.types.contains('Files');
} else {
return false;
}
}
eventToFiles(event:Event){
const transfer = eventToTransfer(event);
if( transfer ){
if(transfer.files && transfer.files.length){
return transfer.files
}
if(transfer.items && transfer.items.length){
return transfer.items
}
}
return []
}
applyExifRotations(
files:File[]
):Promise<File[]>{
const mapper = (
file:File,index:number
):Promise<any>=>{
return applyExifRotation(file)
.then( fixedFile=>files.splice(index, 1, fixedFile) )
}
const proms:Promise<any>[] = []
for(let x=files.length-1; x >= 0; --x){
proms[x] = mapper( files[x], x )
}
return Promise.all( proms ).then( ()=>files )
}
@HostListener('change', ['$event'])
onChange(event:Event):void {
let files = this.element.nativeElement.files || this.eventToFiles(event)
if(!files.length)return
this.stopEvent(event);
this.handleFiles(files)
}
getFileFilterFailName(
file:File
):string | undefined{
for(let i = 0; i < this.filters.length; i++){
if( !this.filters[i].fn.call(this, file) ){
return this.filters[i].name
}
}
return undefined
}
isFileValid(file:File):boolean{
const noFilters = !this.accept && (!this.filters || !this.filters.length)
if( noFilters ){
return true//we have no filters so all files are valid
}
return this.getFileFilterFailName(file) ? false : true
}
isFilesValid(files:File[]){
for(let x=files.length-1; x >= 0; --x){
if( !this.isFileValid(files[x]) ){
return false
}
}
return true
}
protected _acceptFilter(item:File):boolean {
return acceptType(this.accept, item.type, item.name)
}
protected _fileSizeFilter(item:File):boolean {
return !(this.maxSize && item.size > this.maxSize);
}
}
/** browsers try hard to conceal data about file drags, this tends to undo that */
export function filesToWriteableObject( files:File[] ):dragMeta[]{
const jsonFiles:dragMeta[] = []
for(let x=0; x < files.length; ++x){
jsonFiles.push({
type:files[x].type,
kind:files[x]["kind"]
})
}
return jsonFiles
}
export function eventToTransfer(event: any): TransferObject {
if(event.dataTransfer)return event.dataTransfer
return event.originalEvent ? event.originalEvent.dataTransfer : null
}
interface TransferObject {
items?: any[]
files?: any[]
dropEffect?: 'copy' // https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/dropEffect
}