feat(GUI): allow double-click to quick-select drives (#889)

The user can now double-click to swiftly select a drive in the
drive widget instead of having to toggle a drive and then clicking the
continue button to close the modal and finalize the drive selection.

Closes: https://github.com/resin-io/etcher/issues/880
Change-Type: patch
Changelog-Entry: Implement double-click to quick-select drives in the
drive widget.

lib/gui/components/drive-selector/controllers/drive-selector.js

@@ -18,7 +18,7 @@
 
 const _ = require('lodash');
 
-module.exports = function($uibModalInstance, DrivesModel, SelectionStateModel, WarningModalService) {
+module.exports = function($q, $uibModalInstance, DrivesModel, SelectionStateModel, WarningModalService) {
 
   /**
    * @summary The drive selector state
@@ -40,12 +40,46 @@ module.exports = function($uibModalInstance, DrivesModel, SelectionStateModel, W
    */
   this.drives = DrivesModel;
 
+  /**
+   * @summary Determine if we can change a drive's selection state
+   * @function
+   * @private
+   *
+   * @param {Object} drive - drive
+   * @returns {Promise}
+   *
+   * @example
+   * DriveSelectorController.shouldChangeDriveSelectionState(drive)
+   *    .then((shouldChangeDriveSelectionState) => {
+   *        if (shouldChangeDriveSelectionState) doSomething();
+   *    });
+   */
+  const shouldChangeDriveSelectionState = (drive) => {
+    if (!SelectionStateModel.isDriveValid(drive)) {
+      return $q.resolve(false);
+    }
+
+    if (SelectionStateModel.isDriveSizeRecommended(drive)) {
+      return $q.resolve(true);
+    }
+
+    return WarningModalService.display({
+      confirmationLabel: 'Yes, continue',
+      description: [
+        `This image recommends a ${SelectionStateModel.getImageRecommendedDriveSize()}`,
+        `bytes drive, however ${drive.device} is only ${drive.size} bytes.`,
+        'Are you sure you want to continue?'
+      ].join(' ')
+    });
+  };
+
   /**
    * @summary Toggle a drive selection
    * @function
    * @public
    *
    * @param {Object} drive - drive
+   * @returns {Promise} - resolved promise
    *
    * @example
    * DriveSelectorController.toggleDrive({
@@ -55,27 +89,8 @@ module.exports = function($uibModalInstance, DrivesModel, SelectionStateModel, W
    * });
    */
   this.toggleDrive = (drive) => {
-    if (!SelectionStateModel.isDriveValid(drive)) {
-      return;
-    }
-
-    if (_.some([
-      SelectionStateModel.isDriveSizeRecommended(drive),
-      SelectionStateModel.isCurrentDrive(drive.device)
-    ])) {
-      SelectionStateModel.toggleSetDrive(drive.device);
-      return;
-    }
-
-    WarningModalService.display({
-      confirmationLabel: 'Yes, continue',
-      description: [
-        `This image recommends a ${SelectionStateModel.getImageRecommendedDriveSize()}`,
-        `bytes drive, however ${drive.device} is only ${drive.size} bytes.`,
-        'Are you sure you want to continue?'
-      ].join(' ')
-    }).then((userAccepted) => {
-      if (userAccepted) {
+    return shouldChangeDriveSelectionState(drive).then((canChangeDriveSelectionState) => {
+      if (canChangeDriveSelectionState) {
         SelectionStateModel.toggleSetDrive(drive.device);
       }
     });
@@ -103,4 +118,28 @@ module.exports = function($uibModalInstance, DrivesModel, SelectionStateModel, W
 
   };
 
+  /**
+   * @summary Select a drive and close the modal
+   * @function
+   * @public
+   *
+   * @param {Object} drive - drive
+   * @returns {Promise} - resolved promise
+   *
+   * @example
+   * DriveSelectorController.selectDriveAndClose({
+   *   device: '/dev/disk2',
+   *   size: 999999999,
+   *   name: 'Cruzer USB drive'
+   * });
+   */
+  this.selectDriveAndClose = (drive) => {
+    return shouldChangeDriveSelectionState(drive).then((canChangeDriveSelectionState) => {
+      if (canChangeDriveSelectionState) {
+        SelectionStateModel.setDrive(drive.device);
+        this.closeModal();
+      }
+    });
+  };
+
 };

lib/gui/components/drive-selector/templates/drive-selector-modal.tpl.html

@@ -7,6 +7,7 @@
   <ul class="list-group">
     <li class="list-group-item" ng-repeat="drive in modal.drives.getDrives() track by drive.device"
       ng-disabled="!modal.state.isDriveValid(drive)"
+      ng-dblclick="modal.selectDriveAndClose(drive)"
       ng-click="modal.toggleDrive(drive)">
         <div>
           <h4 class="list-group-item-heading">{{ drive.description }} - {{ drive.size | gigabyte | number:1 }} GB</h4>