/**
|
* @fileoverview
|
* File for file selection UI handling.
|
*
|
* @author mebjas <minhazav@gmail.com>
|
*
|
* The word "QR Code" is registered trademark of DENSO WAVE INCORPORATED
|
* http://www.denso-wave.com/qrcode/faqpatent-e.html
|
*/
|
|
import {Html5QrcodeScannerStrings} from "../../strings";
|
import {
|
BaseUiElementFactory,
|
PublicUiElementIdAndClasses
|
} from "./base";
|
|
/**
|
* Interface for callback when a file is selected by user using the button.
|
*/
|
export type OnFileSelected = (file: File) => void;
|
|
/** UI class for file selection handling. */
|
export class FileSelectionUi {
|
|
private readonly fileBasedScanRegion: HTMLDivElement;
|
private readonly fileScanInput: HTMLInputElement;
|
private readonly fileSelectionButton: HTMLButtonElement;
|
|
/** Creates object and renders. */
|
private constructor(
|
parentElement: HTMLDivElement,
|
showOnRender: boolean,
|
onFileSelected: OnFileSelected) {
|
this.fileBasedScanRegion = this.createFileBasedScanRegion();
|
this.fileBasedScanRegion.style.display
|
= showOnRender ? "block" : "none";
|
parentElement.appendChild(this.fileBasedScanRegion);
|
|
let fileScanLabel = document.createElement("label");
|
fileScanLabel.setAttribute("for", this.getFileScanInputId());
|
fileScanLabel.style.display = "inline-block";
|
|
this.fileBasedScanRegion.appendChild(fileScanLabel);
|
|
this.fileSelectionButton
|
= BaseUiElementFactory.createElement<HTMLButtonElement>(
|
"button",
|
PublicUiElementIdAndClasses.FILE_SELECTION_BUTTON_ID);
|
this.setInitialValueToButton();
|
|
// Bind click events with the label element.
|
this.fileSelectionButton.addEventListener("click", (_) => {
|
fileScanLabel.click();
|
});
|
fileScanLabel.append(this.fileSelectionButton);
|
|
this.fileScanInput
|
= BaseUiElementFactory.createElement<HTMLInputElement>(
|
"input", this.getFileScanInputId());
|
this.fileScanInput.type = "file";
|
this.fileScanInput.accept = "image/*";
|
this.fileScanInput.style.display = "none";
|
fileScanLabel.appendChild(this.fileScanInput);
|
|
let $this = this;
|
/*eslint complexity: ["error", 5]*/
|
this.fileScanInput.addEventListener("change", (e: Event) => {
|
if (e == null || e.target == null) {
|
return;
|
}
|
let target: HTMLInputElement = e.target as HTMLInputElement;
|
if (target.files && target.files.length === 0) {
|
return;
|
}
|
let fileList: FileList = target.files!;
|
const file: File = fileList[0];
|
let fileName = file.name;
|
$this.setImageNameToButton(fileName);
|
|
onFileSelected(file);
|
});
|
|
// Render drag and drop label
|
let dragAndDropMessage = this.createDragAndDropMessage();
|
this.fileBasedScanRegion.appendChild(dragAndDropMessage);
|
|
this.fileBasedScanRegion.addEventListener("dragenter", function(event) {
|
$this.fileBasedScanRegion.style.border
|
= $this.fileBasedScanRegionActiveBorder();
|
|
event.stopPropagation();
|
event.preventDefault();
|
});
|
|
this.fileBasedScanRegion.addEventListener("dragleave", function(event) {
|
$this.fileBasedScanRegion.style.border
|
= $this.fileBasedScanRegionDefaultBorder();
|
|
event.stopPropagation();
|
event.preventDefault();
|
});
|
|
this.fileBasedScanRegion.addEventListener("dragover", function(event) {
|
$this.fileBasedScanRegion.style.border
|
= $this.fileBasedScanRegionActiveBorder();
|
|
event.stopPropagation();
|
event.preventDefault();
|
});
|
|
/*eslint complexity: ["error", 10]*/
|
this.fileBasedScanRegion.addEventListener("drop", function(event) {
|
event.stopPropagation();
|
event.preventDefault();
|
|
$this.fileBasedScanRegion.style.border
|
= $this.fileBasedScanRegionDefaultBorder();
|
|
var dataTransfer = event.dataTransfer;
|
if (dataTransfer) {
|
let files = dataTransfer.files;
|
if (!files || files.length === 0) {
|
return;
|
}
|
let isAnyFileImage = false;
|
for (let i = 0; i < files.length; ++i) {
|
let file = files.item(i);
|
if (!file) {
|
continue;
|
}
|
let imageType = /image.*/;
|
|
// Only process images.
|
if (!file.type.match(imageType)) {
|
continue;
|
}
|
|
isAnyFileImage = true;
|
let fileName = file.name;
|
$this.setImageNameToButton(fileName);
|
|
onFileSelected(file);
|
dragAndDropMessage.innerText
|
= Html5QrcodeScannerStrings.dragAndDropMessage();
|
break;
|
}
|
|
// None of the files were images.
|
if (!isAnyFileImage) {
|
dragAndDropMessage.innerText
|
= Html5QrcodeScannerStrings
|
.dragAndDropMessageOnlyImages();
|
}
|
}
|
|
});
|
}
|
|
//#region Public APIs.
|
/** Hide the file selection UI. */
|
public hide() {
|
this.fileBasedScanRegion.style.display = "none";
|
this.fileScanInput.disabled = true;
|
}
|
|
/** Show the file selection UI. */
|
public show() {
|
this.fileBasedScanRegion.style.display = "block";
|
this.fileScanInput.disabled = false;
|
}
|
|
/** Returns {@code true} if UI container is displayed. */
|
public isShowing(): boolean {
|
return this.fileBasedScanRegion.style.display === "block";
|
}
|
|
/** Reset the file selection value */
|
public resetValue() {
|
this.fileScanInput.value = "";
|
this.setInitialValueToButton();
|
}
|
//#endregion
|
|
//#region private APIs
|
private createFileBasedScanRegion(): HTMLDivElement {
|
let fileBasedScanRegion = document.createElement("div");
|
fileBasedScanRegion.style.textAlign = "center";
|
fileBasedScanRegion.style.margin = "auto";
|
fileBasedScanRegion.style.width = "80%";
|
fileBasedScanRegion.style.maxWidth = "600px";
|
fileBasedScanRegion.style.border
|
= this.fileBasedScanRegionDefaultBorder();
|
fileBasedScanRegion.style.padding = "10px";
|
fileBasedScanRegion.style.marginBottom = "10px";
|
return fileBasedScanRegion;
|
}
|
|
private fileBasedScanRegionDefaultBorder() {
|
return "6px dashed #ebebeb";
|
}
|
|
/** Border when a file is being dragged over the file scan region. */
|
private fileBasedScanRegionActiveBorder() {
|
return "6px dashed rgb(153 151 151)";
|
}
|
|
private createDragAndDropMessage(): HTMLDivElement {
|
let dragAndDropMessage = document.createElement("div");
|
dragAndDropMessage.innerText
|
= Html5QrcodeScannerStrings.dragAndDropMessage();
|
dragAndDropMessage.style.fontWeight = "400";
|
return dragAndDropMessage;
|
}
|
|
private setImageNameToButton(imageFileName: string) {
|
const MAX_CHARS = 20;
|
if (imageFileName.length > MAX_CHARS) {
|
// Strip first 8
|
// Strip last 8
|
// Add 4 dots
|
let start8Chars = imageFileName.substring(0, 8);
|
let length = imageFileName.length;
|
let last8Chars = imageFileName.substring(length - 8, length);
|
imageFileName = `${start8Chars}....${last8Chars}`;
|
}
|
|
let newText = Html5QrcodeScannerStrings.fileSelectionChooseAnother()
|
+ " - "
|
+ imageFileName;
|
this.fileSelectionButton.innerText = newText;
|
}
|
|
private setInitialValueToButton() {
|
let initialText = Html5QrcodeScannerStrings.fileSelectionChooseImage()
|
+ " - "
|
+ Html5QrcodeScannerStrings.fileSelectionNoImageSelected();
|
this.fileSelectionButton.innerText = initialText;
|
}
|
|
private getFileScanInputId(): string {
|
return "html5-qrcode-private-filescan-input";
|
}
|
//#endregion
|
|
/**
|
* Creates a file selection UI and renders.
|
*
|
* @param parentElement parent div element to render the UI to.
|
* @param showOnRender if {@code true}, the UI will be shown upon render
|
* else hidden.
|
* @param onFileSelected callback to be called when file selection changes.
|
*
|
* @returns Instance of {@code FileSelectionUi}.
|
*/
|
public static create(
|
parentElement: HTMLDivElement,
|
showOnRender: boolean,
|
onFileSelected: OnFileSelected): FileSelectionUi {
|
let button = new FileSelectionUi(
|
parentElement, showOnRender, onFileSelected);
|
return button;
|
}
|
}
|
