Add 'CollapseAll' support in the Dependency Explorer (#198)

Signed-off-by: Sheng Chen <[email protected]>

Author: jdneo

package-lock.json

@@ -12,7 +12,7 @@
     "explorer"
   ],
   "engines": {
-    "vscode": "^1.28.0"
+    "vscode": "^1.30.0"
   },
   "repository": {
     "type": "git",
@@ -175,7 +175,7 @@
     "@types/lodash": "^4.14.139",
     "@types/mocha": "^5.2.5",
     "@types/node": "^8.10.36",
-    "@types/vscode": "^1.28.0",
+    "@types/vscode": "1.30.0",
     "@types/xml2js": "^0.4.3",
     "cross-env": "^5.2.0",
     "glob": "^7.1.4",

package.json

@@ -19,7 +19,7 @@ export class DependencyExplorer {
 
     constructor(public readonly context: ExtensionContext) {
         this._dataProvider = new DependencyDataProvider(context);
-        this._dependencyViewer = window.createTreeView("javaDependencyExplorer", { treeDataProvider: this._dataProvider });
+        this._dependencyViewer = window.createTreeView("javaDependencyExplorer", { treeDataProvider: this._dataProvider, showCollapseAll: true });
 
         window.onDidChangeActiveTextEditor((textEditor: TextEditor) => {
             if (textEditor && textEditor.document && Settings.syncWithFolderExplorer()) {