MOBILE-3040 submission: Hide reusing submission button if it was empty

src/addon/mod/assign/classes/base-submission-handler.ts

@@ -44,6 +44,17 @@ export class AddonModAssignBaseSubmissionHandler implements AddonModAssignSubmis
         return false;
     }
 
+    /**
+     * Check if a plugin has no data.
+     *
+     * @param assign The assignment.
+     * @param plugin The plugin object.
+     * @return Whether the plugin is empty.
+     */
+    isEmpty(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): boolean {
+        return true;
+    }
+
     /**
      * Should clear temporary data for a cancelled submission.
      *

src/addon/mod/assign/components/submission/addon-mod-assign-submission.html

@@ -73,7 +73,7 @@
                         <a ion-button block text-wrap color="primary" *ngIf="!hasOffline && (!userSubmission || !userSubmission.status || userSubmission.status == statusNew)" (click)="goToEdit()">{{ 'addon.mod_assign.addsubmission' | translate }}</a>
                         <!-- If reopened, show addfromprevious and addnewattempt. -->
                         <ng-container *ngIf="!hasOffline && userSubmission && userSubmission.status == statusReopened">
-                            <a ion-button block text-wrap color="primary" (click)="copyPrevious()">{{ 'addon.mod_assign.addnewattemptfromprevious' | translate }}</a>
+                            <a *ngIf="!isPreviousAttemptEmpty" ion-button block text-wrap color="primary" (click)="copyPrevious()">{{ 'addon.mod_assign.addnewattemptfromprevious' | translate }}</a>
                             <a ion-button block text-wrap color="primary" (click)="goToEdit()">{{ 'addon.mod_assign.addnewattempt' | translate }}</a>
                         </ng-container>
                         <!-- Else show editsubmission. -->

src/addon/mod/assign/components/submission/submission.ts

@@ -103,6 +103,7 @@ export class AddonModAssignSubmissionComponent implements OnInit, OnDestroy {
     protected siteId: string; // Current site ID.
     protected currentUserId: number; // Current user ID.
     protected previousAttempt: AddonModAssignSubmissionPreviousAttempt; // The previous attempt.
+    protected isPreviousAttemptEmpty: boolean; // Whether the previous attempt contains an empty submission.
     protected submissionStatusAvailable: boolean; // Whether we were able to retrieve the submission status.
     protected originalGrades: any = {}; // Object with the original grade data, to check for changes.
     protected isDestroyed: boolean; // Whether the component has been destroyed.
@@ -373,6 +374,7 @@ export class AddonModAssignSubmissionComponent implements OnInit, OnDestroy {
         let isBlind = !!this.blindId;
 
         this.previousAttempt = undefined;
+        this.isPreviousAttemptEmpty = true;
 
         if (!this.submitId) {
             this.submitId = this.currentUserId;
@@ -428,6 +430,7 @@ export class AddonModAssignSubmissionComponent implements OnInit, OnDestroy {
                     return a.attemptnumber - b.attemptnumber;
                 });
                 this.previousAttempt = previousAttempts[previousAttempts.length - 1];
+                this.isPreviousAttemptEmpty = this.assignHelper.isSubmissionEmpty(this.assign, this.previousAttempt.submission);
             }
 
             // Treat last attempt.

src/addon/mod/assign/providers/helper.ts

@@ -181,6 +181,21 @@ export class AddonModAssignHelperProvider {
         return Promise.all(promises);
     }
 
+    /**
+     * Check if a submission has no content.
+     *
+     * @param assign Assignment object.
+     * @param submission Submission to inspect.
+     * @return Whether the submission is empty.
+     */
+    isSubmissionEmpty(assign: AddonModAssignAssign, submission?: AddonModAssignSubmission): boolean {
+        if (!submission) {
+            return true;
+        }
+
+        return !!submission.plugins.find((plugin) => this.submissionDelegate.isPluginEmpty(assign, plugin));
+    }
+
     /**
      * List the participants for a single assignment, with some summary info about their submissions.
      *

src/addon/mod/assign/providers/submission-delegate.ts

@@ -43,6 +43,15 @@ export interface AddonModAssignSubmissionHandler extends CoreDelegateHandler {
     canEditOffline?(assign: AddonModAssignAssign, submission: AddonModAssignSubmission,
             plugin: AddonModAssignPlugin): boolean | Promise<boolean>;
 
+    /**
+     * Check if a plugin has no data.
+     *
+     * @param assign The assignment.
+     * @param plugin The plugin object.
+     * @return Whether the plugin is empty.
+     */
+    isEmpty?(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): boolean;
+
     /**
      * Should clear temporary data for a cancelled submission.
      *
@@ -368,6 +377,17 @@ export class AddonModAssignSubmissionDelegate extends CoreDelegate {
         return Promise.resolve(this.executeFunctionOnEnabled(pluginType, 'isEnabledForEdit'));
     }
 
+    /**
+     * Check if a plugin has no data.
+     *
+     * @param assign The assignment.
+     * @param plugin The plugin object.
+     * @return Whether the plugin is empty.
+     */
+    isPluginEmpty(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): boolean {
+        return this.executeFunctionOnEnabled(plugin.type, 'isEmpty', [assign, plugin]);
+    }
+
     /**
      * Prefetch any required data for a submission plugin.
      *

src/addon/mod/assign/submission/file/providers/handler.ts

@@ -61,6 +61,19 @@ export class AddonModAssignSubmissionFileHandler implements AddonModAssignSubmis
         return true;
     }
 
+    /**
+     * Check if a plugin has no data.
+     *
+     * @param assign The assignment.
+     * @param plugin The plugin object.
+     * @return Whether the plugin is empty.
+     */
+    isEmpty(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): boolean {
+        const files = this.assignProvider.getSubmissionPluginAttachments(plugin);
+
+        return files.length === 0;
+    }
+
     /**
      * Should clear temporary data for a cancelled submission.
      *

src/addon/mod/assign/submission/onlinetext/providers/handler.ts

@@ -54,6 +54,20 @@ export class AddonModAssignSubmissionOnlineTextHandler implements AddonModAssign
         return false;
     }
 
+    /**
+     * Check if a plugin has no data.
+     *
+     * @param assign The assignment.
+     * @param plugin The plugin object.
+     * @return Whether the plugin is empty.
+     */
+    isEmpty(assign: AddonModAssignAssign, plugin: AddonModAssignPlugin): boolean {
+        const text = this.assignProvider.getSubmissionPluginText(plugin, true),
+            files = this.assignProvider.getSubmissionPluginAttachments(plugin);
+
+        return text.length === 0 && files.length === 0;
+    }
+
     /**
      * This function will be called when the user wants to create a new submission based on the previous one.
      * It should add to pluginData the data to send to server based in the data in plugin (previous attempt).