Mobile: Added duplicate option when selecting notes. (laurent22#1969)

* Adding duplicate button on screen-header.js when selecting notes; Adding 'duplicateMultipleNotes' function on Note.js;

* Using for-loop like the rest of the code does

* changing from 'uniqueTitle' to 'ensureUniqueTitle'

ReactNativeClient/lib/components/screen-header.js

@@ -163,6 +163,16 @@ class ScreenHeaderComponent extends React.PureComponent {
 		NavService.go('Search');
 	}
 
+	async duplicateButton_press() {
+		const noteIds = this.props.selectedNoteIds;
+
+		//Duplicate all selected notes. ensureUniqueTitle is set to true to use the
+		//original note's name as a root for the new unique identifier.
+		await Note.duplicateMultipleNotes(noteIds, {ensureUniqueTitle: true});
+
+		this.props.dispatch({ type: 'NOTE_SELECTION_END' });
+	}
+
 	async deleteButton_press() {
 		// Dialog needs to be displayed as a child of the parent component, otherwise
 		// it won't be visible within the header component.
@@ -245,6 +255,16 @@ class ScreenHeaderComponent extends React.PureComponent {
 			);
 		}
 
+		function duplicateButton(styles, onPress) {
+			return (
+				<TouchableOpacity onPress={onPress}>
+					<View style={styles.iconButton}>
+						<Icon name="md-copy" style={styles.topIcon} />
+					</View>
+				</TouchableOpacity>
+			);
+		}
+
 		function sortButton(styles, onPress) {
 			return (
 				<TouchableOpacity onPress={onPress}>
@@ -282,6 +302,12 @@ class ScreenHeaderComponent extends React.PureComponent {
 					<Text style={this.styles().contextMenuItemText}>{_('Delete')}</Text>
 				</MenuOption>
 			);
+
+			menuOptionComponents.push(
+				<MenuOption value={() => this.duplicateButton_press()} key={'menuOption_duplicate'} style={this.styles().contextMenuItem}>
+					<Text style={this.styles().contextMenuItemText}>{_('Duplicate')}</Text>
+				</MenuOption>
+			);
 		}
 
 		const createTitleComponent = () => {
@@ -383,6 +409,7 @@ class ScreenHeaderComponent extends React.PureComponent {
 		const backButtonComp = !showBackButton ? null : backButton(this.styles(), () => this.backButton_press(), backButtonDisabled);
 		const searchButtonComp = !showSearchButton ? null : searchButton(this.styles(), () => this.searchButton_press());
 		const deleteButtonComp = this.props.noteSelectionEnabled ? deleteButton(this.styles(), () => this.deleteButton_press()) : null;
+		const duplicateButtonComp = this.props.noteSelectionEnabled ? duplicateButton(this.styles(), () => this.duplicateButton_press()) : null;
 		const sortButtonComp = !this.props.noteSelectionEnabled && this.props.sortButton_press ? sortButton(this.styles(), () => this.props.sortButton_press()) : null;
 		const windowHeight = Dimensions.get('window').height - 50;
 
@@ -419,6 +446,7 @@ class ScreenHeaderComponent extends React.PureComponent {
 					{titleComp}
 					{searchButtonComp}
 					{deleteButtonComp}
+					{duplicateButtonComp}
 					{sortButtonComp}
 					{menuComp}
 				</View>

ReactNativeClient/lib/models/Note.js

@@ -481,6 +481,25 @@ class Note extends BaseItem {
 		return note;
 	}
 
+	static async duplicateMultipleNotes(noteIds, options = null){
+		/*
+			if options.uniqueTitle is true, a unique title for the duplicated file will be assigned.
+		 */
+		const ensureUniqueTitle = options && options.ensureUniqueTitle;
+
+		for(const noteId of noteIds){
+			const noteOptions = {};
+
+			//If ensureUniqueTitle is truthy, set the original note's name as root for the unique title.
+			if(ensureUniqueTitle){
+				const originalNote = await Note.load(noteId);
+				noteOptions.uniqueTitle = originalNote.title;
+			}
+
+			await Note.duplicate(noteId, noteOptions);
+		}
+	}
+
 	static async duplicate(noteId, options = null) {
 		const changes = options && options.changes;
 		const uniqueTitle = options && options.uniqueTitle;