Support isDirty flag for model view editors and begin plumb through of save support (#2547)

* Add dirty and save support to model view

* Add issue # for a TODO

src/sql/parts/modelComponents/modelEditor/modelViewInput.ts

@@ -3,16 +3,50 @@
  *  Licensed under the Source EULA. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
+import * as sqlops from 'sqlops';
+
 import { TPromise } from 'vs/base/common/winjs.base';
 import { IEditorModel } from 'vs/platform/editor/common/editor';
-import { EditorInput } from 'vs/workbench/common/editor';
+import { EditorInput, EditorModel, ConfirmResult } from 'vs/workbench/common/editor';
 import * as DOM from 'vs/base/browser/dom';
 import { IInstantiationService } from 'vs/platform/instantiation/common/instantiation';
 import { IPartService, Parts } from 'vs/workbench/services/part/common/partService';
 
 import { DialogPane } from 'sql/platform/dialog/dialogPane';
+import { Emitter, Event } from 'vs/base/common/event';
 
-import * as sqlops from 'sqlops';
+export type ModeViewSaveHandler = (handle: number) => Thenable<boolean>;
+
+export class ModelViewInputModel extends EditorModel {
+	private dirty: boolean;
+	private readonly _onDidChangeDirty: Emitter<void> = this._register(new Emitter<void>());
+	get onDidChangeDirty(): Event<void> { return this._onDidChangeDirty.event; }
+
+	constructor(public readonly modelViewId, private readonly handle: number, private saveHandler?: ModeViewSaveHandler) {
+		super();
+		this.dirty = false;
+	}
+
+	get isDirty(): boolean {
+		return this.dirty;
+	}
+
+	public setDirty(dirty: boolean): void {
+		if (this.dirty === dirty) {
+			return;
+		}
+
+		this.dirty = dirty;
+		this._onDidChangeDirty.fire();
+	}
+
+	save(): TPromise<boolean> {
+		if (this.saveHandler) {
+			return TPromise.wrap(this.saveHandler(this.handle));
+		}
+		return TPromise.wrap(true);
+	}
+}
 export class ModelViewInput extends EditorInput {
 
 	public static ID: string = 'workbench.editorinputs.ModelViewEditorInput';
@@ -20,14 +54,15 @@ export class ModelViewInput extends EditorInput {
 	private _dialogPaneContainer: HTMLElement;
 	private _dialogPane: DialogPane;
 
-	constructor(private _title: string, private _modelViewId: string,
+	constructor(private _title: string, private _model: ModelViewInputModel,
 		private _options: sqlops.ModelViewEditorOptions,
 		@IInstantiationService private _instantiationService: IInstantiationService,
 		@IPartService private readonly _partService: IPartService
 	) {
 		super();
+		this._model.onDidChangeDirty(() => this._onDidChangeDirty.fire());
 		this._container = document.createElement('div');
-		this._container.id = `modelView-${_modelViewId}`;
+		this._container.id = `modelView-${_model.modelViewId}`;
 		this._partService.getContainer(Parts.EDITOR_PART).appendChild(this._container);
 
 	}
@@ -37,7 +72,7 @@ export class ModelViewInput extends EditorInput {
 	}
 
 	public get modelViewId(): string {
-		return this._modelViewId;
+		return this._model.modelViewId;
 	}
 
 	public getTypeId(): string {
@@ -85,6 +120,31 @@ export class ModelViewInput extends EditorInput {
 		return this._options;
 	}
 
+	/**
+	 * An editor that is dirty will be asked to be saved once it closes.
+	 */
+	isDirty(): boolean {
+		return this._model.isDirty;
+	}
+
+	/**
+	 * Subclasses should bring up a proper dialog for the user if the editor is dirty and return the result.
+	 */
+	confirmSave(): TPromise<ConfirmResult> {
+		// TODO #2530 support save on close / confirm save. This is significantly more work
+		// as we need to either integrate with textFileService (seems like this isn't viable)
+		// or register our own complimentary service that handles the lifecycle operations such
+		// as close all, auto save etc.
+		return TPromise.wrap(ConfirmResult.DONT_SAVE);
+	}
+
+	/**
+	 * Saves the editor if it is dirty. Subclasses return a promise with a boolean indicating the success of the operation.
+	 */
+	save(): TPromise<boolean> {
+		return this._model.save();
+	}
+
 	public dispose(): void {
 		if (this._dialogPane) {
 			this._dialogPane.dispose();
@@ -93,6 +153,9 @@ export class ModelViewInput extends EditorInput {
 			this._container.remove();
 			this._container = undefined;
 		}
+		if (this._model) {
+			this._model.dispose();
+		}
 		super.dispose();
 	}
 }