Open-ILS/src/eg2/src/app/share/print/print.component.ts

   1 import {Component, OnInit, TemplateRef, ElementRef, Renderer2} from '@angular/core';
   2 import {PrintService, PrintRequest} from './print.service';
   3 import {StoreService} from '@eg/core/store.service';
   4 import {ServerStoreService} from '@eg/core/server-store.service';
   5 import {HatchService, HatchMessage} from './hatch.service';
   6 import {ToastService} from '@eg/share/toast/toast.service';
   7 import {StringService} from '@eg/share/string/string.service';
   8
   9 @Component({
  10     selector: 'eg-print',
  11     templateUrl: './print.component.html'
  12 })
  13
  14 export class PrintComponent implements OnInit {
  15
  16     // Template that requires local processing
  17     template: TemplateRef<any>;
  18
  19     // Context data used for processing the template.
  20     context: any;
  21
  22     // Insertion point for externally-compiled templates
  23     htmlContainer: Element;
  24
  25     isPrinting: boolean;
  26
  27     printQueue: PrintRequest[];
  28
  29     constructor(
  30         private renderer: Renderer2,
  31         private elm: ElementRef,
  32         private store: StoreService,
  33         private serverStore: ServerStoreService,
  34         private hatch: HatchService,
  35         private toast: ToastService,
  36         private strings: StringService,
  37         private printer: PrintService) {
  38         this.isPrinting = false;
  39         this.printQueue = [];
  40     }
  41
  42     ngOnInit() {
  43         this.printer.onPrintRequest$.subscribe(
  44             printReq => this.handlePrintRequest(printReq));
  45
  46         this.htmlContainer =
  47             this.renderer.selectRootElement('#eg-print-html-container');
  48     }
  49
  50     handlePrintRequest(printReq: PrintRequest) {
  51
  52         if (this.isPrinting) {
  53             // Avoid print collisions by queuing requests as needed.
  54             this.printQueue.push(printReq);
  55             return;
  56         }
  57
  58         this.isPrinting = true;
  59
  60         this.applyTemplate(printReq).then(() => {
  61             // Give templates a chance to render before printing
  62             setTimeout(() => {
  63                 this.dispatchPrint(printReq);
  64                 this.reset();
  65             });
  66         });
  67     }
  68
  69     applyTemplate(printReq: PrintRequest): Promise<any> {
  70
  71         if (printReq.template) {
  72             // Local Angular template.
  73             this.template = printReq.template;
  74             this.context = {$implicit: printReq.contextData};
  75             return Promise.resolve();
  76         }
  77
  78         let promise;
  79
  80         // Precompiled text
  81         if (printReq.text) {
  82             promise = Promise.resolve();
  83
  84         } else if (printReq.templateName || printReq.templateId) {
  85             // Server-compiled template
  86
  87             promise = this.printer.compileRemoteTemplate(printReq).then(
  88                 response => {
  89                     printReq.text = response.content;
  90                     printReq.contentType = response.contentType;
  91                 },
  92                 err => {
  93
  94                     if (err && err.notFound) {
  95
  96                         this.strings.interpolate(
  97                             'eg.print.template.not_found',
  98                             {name: printReq.templateName}
  99                         ).then(msg => this.toast.danger(msg));
 100
 101                     } else {
 102
 103                         console.error('Print generation failed', printReq);
 104
 105                         this.strings.interpolate(
 106                             'eg.print.template.error',
 107                             {name: printReq.templateName, id: printReq.templateId}
 108                         ).then(msg => this.toast.danger(msg));
 109                     }
 110
 111                     return Promise.reject(new Error(
 112                         'Error compiling server-hosted print template'));
 113                 }
 114             );
 115
 116         } else {
 117             console.error('Cannot find template', printReq);
 118             return Promise.reject(new Error('Cannot find print template'));
 119         }
 120
 121         return promise.then(() => {
 122
 123             // Insert HTML into the browser DOM for in-browser printing.
 124             if (printReq.text && !this.useHatch()) {
 125
 126                 if (printReq.contentType === 'text/plain') {
 127                 // Wrap text/plain content in pre's to prevent
 128                 // unintended html formatting.
 129                     printReq.text = `<pre>${printReq.text}</pre>`;
 130                 }
 131
 132                 this.htmlContainer.innerHTML = printReq.text;
 133             }
 134         });
 135     }
 136
 137     // Clear the print data
 138     reset() {
 139         this.isPrinting = false;
 140         this.template = null;
 141         this.context = null;
 142         this.htmlContainer.innerHTML = '';
 143
 144         if (this.printQueue.length) {
 145             this.handlePrintRequest(this.printQueue.pop());
 146         }
 147     }
 148
 149     dispatchPrint(printReq: PrintRequest) {
 150
 151         if (!printReq.text) {
 152             // Sometimes the results come from an externally-parsed HTML
 153             // template, other times they come from an in-page template.
 154             printReq.text = this.elm.nativeElement.innerHTML;
 155         }
 156
 157         // Retain a copy of each printed document in localStorage
 158         // so it may be reprinted.
 159         this.store.setLocalItem('eg.print.last_printed', {
 160             content: printReq.text,
 161             context: printReq.printContext,
 162             content_type: printReq.contentType,
 163             show_dialog: printReq.showDialog
 164         });
 165
 166         if (this.useHatch()) {
 167             this.printViaHatch(printReq);
 168         } else {
 169             // Here the needed HTML is already in the page.
 170             window.print();
 171         }
 172     }
 173
 174     useHatch(): boolean {
 175         return this.store.getLocalItem('eg.hatch.enable.printing')
 176             && this.hatch.connect();
 177     }
 178
 179     printViaHatch(printReq: PrintRequest) {
 180
 181         // Send a full HTML document to Hatch
 182         let html = printReq.text;
 183         if (printReq.contentType === 'text/html') {
 184             html = `<html><body>${printReq.text}</body></html>`;
 185         }
 186
 187         this.serverStore.getItem(`eg.print.config.${printReq.printContext}`)
 188         .then(config => {
 189
 190             const msg = new HatchMessage({
 191                 action: 'print',
 192                 content: html,
 193                 settings: config || {},
 194                 contentType: 'text/html',
 195                 showDialog: printReq.showDialog
 196             });
 197
 198             this.hatch.sendRequest(msg).then(
 199                 ok  => console.debug('Print request succeeded'),
 200                 err => console.warn('Print request failed', err)
 201             );
 202         });
 203     }
 204 }
 205