upload: new 'click' mode with file/folder dialog support (#1738)

* new 'click' mode with file/folder dialog support

* fix uploading files to folders via drop on Safari

ng2-components/ng2-alfresco-core/README.md

@@ -89,6 +89,56 @@ It is possible controlling when upload behaviour is enabled/disabled by binding
 <div [adf-upload]="isUploadEnabled()">...</div>
 ```
 
+You can decorate any element including buttons, for example:
+
+```html
+<button [adf-upload]="true" [multiple]="true" [accept]="'image/*'">
+    Upload photos
+</button>
+```
+
+### Modes
+
+Directive supports several modes:
+
+- **drop** mode, where decorated element acts like a drop zone for files (**default** mode)
+- **click** mode, where decorated element invokes File Dialog to select files or folders.
+
+It is also possible combining modes together. 
+
+```html
+<div [adf-upload]="true" mode="['click']">...</div>
+<div [adf-upload]="true" mode="['drop']">...</div>
+<div [adf-upload]="true" mode="['click', 'drop']">...</div>
+```
+
+#### Click mode
+
+For the click mode you can provide additional attributes for the File Dialog:
+
+- **directory**, enables directory selection
+- **multiple**, enables multiple file/folder selection
+- **accept**, filters the content accepted
+
+```html
+<div style="width: 50px; height: 50px; background-color: brown"
+     [adf-upload]="true"
+     [multiple]="true"
+     [accept]="'image/*'">
+</div>
+
+<div style="width: 50px; height: 50px; background-color: blueviolet"
+     [adf-upload]="true"
+     [multiple]="true"
+     [directory]="true">
+</div>
+```
+
+#### Drop mode
+
+For the moment upload directive supports only Files (single or multiple). 
+Support for Folders and `accept` filters is subject to implement.
+
 ### Events
 
 Once a single or multiple files are dropped on the decorated element the `upload-files` [CustomEvent](https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent) is raised.

ng2-components/ng2-alfresco-core/src/directives/upload.directive.spec.ts

@@ -27,7 +27,7 @@ describe('UploadDirective', () => {
         nativeElement = {
             dispatchEvent: () => {}
         };
-        directive = new UploadDirective(new ElementRef(nativeElement));
+        directive = new UploadDirective(new ElementRef(nativeElement), null);
     });
 
     it('should be enabled by default', () => {

ng2-components/ng2-alfresco-core/src/directives/upload.directive.ts

@@ -15,12 +15,12 @@
  * limitations under the License.
  */
 
-import { Directive, Input, HostBinding, HostListener, ElementRef } from '@angular/core';
+import { Directive, Input, HostBinding, HostListener, ElementRef, Renderer, OnInit } from '@angular/core';
 
 @Directive({
     selector: '[adf-upload]'
 })
-export class UploadDirective {
+export class UploadDirective implements OnInit {
 
     @Input('adf-upload')
     enabled: boolean = true;
@@ -28,25 +28,68 @@ export class UploadDirective {
     @Input('adf-upload-data')
     data: any;
 
+    @Input()
+    mode: string[] = ['drop']; // click|drop
+
+    @Input()
+    multiple: boolean;
+
+    @Input()
+    accept: string;
+
+    @Input()
+    directory: boolean;
+
     @Input()
     debug: boolean = false;
 
     @HostBinding('class.adf-upload__dragging')
     isDragging: boolean;
 
-    constructor(private el: ElementRef) {
+    private upload: HTMLInputElement;
+
+    constructor(private el: ElementRef, private renderer: Renderer) {
+    }
+
+    ngOnInit() {
+        if (this.isClickMode() && this.renderer) {
+            this.upload = this.renderer.createElement(this.el.nativeElement.parentNode, 'input') as HTMLInputElement;
+            this.upload.type = 'file';
+            this.upload.style.display = 'none';
+            this.upload.addEventListener('change', e => this.onSelectFiles(e));
+
+            if (this.multiple) {
+                this.upload.setAttribute('multiple', '');
+            }
+
+            if (this.accept) {
+                this.upload.setAttribute('accept', this.accept);
+            }
+
+            if (this.directory) {
+                this.upload.setAttribute('webkitdirectory', '');
+            }
+        }
+    }
+
+    @HostListener('click', ['$event'])
+    onClick(event: Event) {
+        if (this.isClickMode() && this.upload) {
+            event.preventDefault();
+            this.upload.click();
+        }
     }
 
     @HostListener('dragenter')
     onDragEnter() {
-        if (this.enabled) {
+        if (this.isDropMode()) {
             this.isDragging = true;
         }
     }
 
     @HostListener('dragover', ['$event'])
     onDragOver(event: Event) {
-        if (this.enabled) {
+        if (this.isDropMode()) {
             if (event) {
                 event.preventDefault();
             }
@@ -56,58 +99,94 @@ export class UploadDirective {
 
     @HostListener('dragleave')
     onDragLeave() {
-        if (this.enabled) {
+        if (this.isDropMode()) {
             this.isDragging = false;
         }
     }
 
     @HostListener('drop', ['$event'])
     onDrop(event: DragEvent) {
-        if (this.enabled) {
+        if (this.isDropMode()) {
             event.preventDefault();
             event.stopPropagation();
 
             this.isDragging = false;
 
-            let files = this.getFilesDropped(event.dataTransfer);
-            if (files.length > 0) {
-                let e = new CustomEvent('upload-files', {
-                    detail: {
-                        sender: this,
-                        data: this.data,
-                        files: files
-                    },
-                    bubbles: true
-                });
-
-                this.el.nativeElement.dispatchEvent(e);
-            }
+            const files = this.getFilesDropped(event.dataTransfer);
+            this.onUploadFiles(files);
         }
     }
 
+    onUploadFiles(files: File[]) {
+        if (this.enabled && files.length > 0) {
+            let e = new CustomEvent('upload-files', {
+                detail: {
+                    sender: this,
+                    data: this.data,
+                    files: files
+                },
+                bubbles: true
+            });
+
+            this.el.nativeElement.dispatchEvent(e);
+        }
+    }
+
+    protected hasMode(mode: string): boolean {
+        return this.enabled && mode && this.mode && this.mode.indexOf(mode) > -1;
+    }
+
+    protected isDropMode(): boolean {
+        return this.hasMode('drop');
+    }
+
+    protected isClickMode(): boolean {
+        return this.hasMode('click');
+    }
+
     /**
      * Extract files from the DataTransfer object used to hold the data that is being dragged during a drag and drop operation.
      * @param dataTransfer DataTransfer object
      */
     protected getFilesDropped(dataTransfer: DataTransfer): File[] {
-        let result: File[] = [];
+        const result: File[] = [];
 
         if (dataTransfer) {
-            let items: DataTransferItemList = dataTransfer.items;
+            const items: FileList = dataTransfer.files;
 
             if (items && items.length > 0) {
                 for (let i = 0; i < items.length; i++) {
-                    let item: DataTransferItem = items[i];
-                    if (item.type) {
-                        let file = item.getAsFile();
-                        if (file) {
-                            result.push(file);
-                        }
-                    }
+                result.push(items[i]);
                 }
             }
         }
 
         return result;
     }
+
+    /**
+     * Extract files from the FileList object used to hold files that user selected by means of File Dialog.
+     * @param fileList List of selected files
+     */
+    protected getFilesSelected(fileList: FileList) {
+        let result: File[] = [];
+        if (fileList && fileList.length > 0) {
+            for (let i = 0; i < fileList.length; i++) {
+                result.push(fileList[i]);
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Invoked when user selects files or folders by means of File Dialog
+     * @param e DOM event
+     */
+    protected onSelectFiles(e: Event) {
+        if (this.isClickMode()) {
+            const input = (<HTMLInputElement>e.currentTarget);
+            const files = this.getFilesSelected(input.files);
+            this.onUploadFiles(files);
+        }
+    }
 }