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
   7 @Component({
   8     selector: 'eg-print',
   9     templateUrl: './print.component.html'
  10 })
  11
  12 export class PrintComponent implements OnInit {
  13
  14     // Template that requires local processing
  15     template: TemplateRef<any>;
  16
  17     // Context data used for processing the template.
  18     context: any;
  19
  20     // Insertion point for externally-compiled templates
  21     htmlContainer: Element;
  22
  23     isPrinting: boolean;
  24
  25     printQueue: PrintRequest[];
  26
  27     constructor(
  28         private renderer: Renderer2,
  29         private elm: ElementRef,
  30         private store: StoreService,
  31         private serverStore: ServerStoreService,
  32         private hatch: HatchService,
  33         private printer: PrintService) {
  34         this.isPrinting = false;
  35         this.printQueue = [];
  36     }
  37
  38     ngOnInit() {
  39         this.printer.onPrintRequest$.subscribe(
  40             printReq => this.handlePrintRequest(printReq));
  41
  42         this.htmlContainer =
  43             this.renderer.selectRootElement('#eg-print-html-container');
  44     }
  45
  46     handlePrintRequest(printReq: PrintRequest) {
  47
  48         if (this.isPrinting) {
  49             // Avoid print collisions by queuing requests as needed.
  50             this.printQueue.push(printReq);
  51             return;
  52         }
  53
  54         this.isPrinting = true;
  55
  56         this.applyTemplate(printReq);
  57
  58         // Give templates a chance to render before printing
  59         setTimeout(() => {
  60             this.dispatchPrint(printReq);
  61             this.reset();
  62         });
  63     }
  64
  65     applyTemplate(printReq: PrintRequest) {
  66
  67         if (printReq.template) {
  68             // Inline template.  Let Angular do the interpolationwork.
  69             this.template = printReq.template;
  70             this.context = {$implicit: printReq.contextData};
  71             return;
  72         }
  73
  74         if (printReq.text && !this.useHatch()) {
  75             // Insert HTML into the browser DOM for in-browser printing only.
  76
  77             if (printReq.contentType === 'text/plain') {
  78                 // Wrap text/plain content in pre's to prevent
  79                 // unintended html formatting.
  80                 printReq.text = `<pre>${printReq.text}</pre>`;
  81             }
  82
  83             this.htmlContainer.innerHTML = printReq.text;
  84         }
  85     }
  86
  87     // Clear the print data
  88     reset() {
  89         this.isPrinting = false;
  90         this.template = null;
  91         this.context = null;
  92         this.htmlContainer.innerHTML = '';
  93
  94         if (this.printQueue.length) {
  95             this.handlePrintRequest(this.printQueue.pop());
  96         }
  97     }
  98
  99     dispatchPrint(printReq: PrintRequest) {
 100
 101         if (!printReq.text) {
 102             // Sometimes the results come from an externally-parsed HTML
 103             // template, other times they come from an in-page template.
 104             printReq.text = this.elm.nativeElement.innerHTML;
 105         }
 106
 107         // Retain a copy of each printed document in localStorage
 108         // so it may be reprinted.
 109         this.store.setLocalItem('eg.print.last_printed', {
 110             content: printReq.text,
 111             context: printReq.printContext,
 112             content_type: printReq.contentType,
 113             show_dialog: printReq.showDialog
 114         });
 115
 116         if (this.useHatch()) {
 117             this.printViaHatch(printReq);
 118         } else {
 119             // Here the needed HTML is already in the page.
 120             window.print();
 121         }
 122     }
 123
 124     useHatch(): boolean {
 125         return this.store.getLocalItem('eg.hatch.enable.printing')
 126             && this.hatch.connect();
 127     }
 128
 129     printViaHatch(printReq: PrintRequest) {
 130
 131         // Send a full HTML document to Hatch
 132         const html = `<html><body>${printReq.text}</body></html>`;
 133
 134         this.serverStore.getItem(`eg.print.config.${printReq.printContext}`)
 135         .then(config => {
 136
 137             const msg = new HatchMessage({
 138                 action: 'print',
 139                 content: html,
 140                 settings: config || {},
 141                 contentType: 'text/html',
 142                 showDialog: printReq.showDialog
 143             });
 144
 145             this.hatch.sendRequest(msg).then(
 146                 ok  => console.debug('Print request succeeded'),
 147                 err => console.warn('Print request failed', err)
 148             );
 149         });
 150     }
 151 }
 152