Refactor HTML UI handling of native commands.

chrome/browser/resources/vr_shell/vr_shell_ui_api.js

Index: chrome/browser/resources/vr_shell/vr_shell_ui_api.js
diff --git a/chrome/browser/resources/vr_shell/vr_shell_ui_api.js b/chrome/browser/resources/vr_shell/vr_shell_ui_api.js
index db4c757d24719cc9b2359f3863142cb19b165555..4bbb4830b5fba55947d6a859c79fb71feb8ade7b 100644
--- a/chrome/browser/resources/vr_shell/vr_shell_ui_api.js
+++ b/chrome/browser/resources/vr_shell/vr_shell_ui_api.js
@@ -437,3 +437,141 @@ api.Animation = class {
     this.to.x = opacity;
   }
 };
+
+/**
+ * Abstract class handling webui command calls from native.  The UI must
+ * subclass this and override the handlers.
+ */
+api.NativeCommandHandler = class {
+  /**
+   * @param {api.Mode} mode
+   */
+  onSetMode(mode) {}
+
+  /**
+   * Handles entering or exiting full-screen mode.
+   * @param {boolean} fullscreen
+   */
+  onSetFullscreen(fullscreen) {}
+
+  /**
+   * A controller app button click has happened.
+   */
+  onAppButtonClicked() {}
+
+  /**
+   * Handles a change in the visible page's security level.
+   * @param {number} level
+   */
+  onSetSecurityLevel(level) {}
+
+  /**
+   * Handles a change in the WebVR-specific secure-origin state. If |secure| is
+   * false, the UI must convey appropriate security warnings.
+   * @param {boolean} secure
+   */
+  onSetWebVRSecureOrigin(secure) {}
+
+  /**
+   * Handles enabling of a development-oriented control to reload the UI.
+   * @param {boolean} enabled
+   */
+  onSetReloadUiCapabilityEnabled(enabled) {}
+
+  /**
+   * Handles a new URL, specifying the host and path compoments.
+   * @param {string} host
+   * @param {string} path
+   */
+  onSetUrl(host, path) {}
+
+  /**
+   * Handle a change in loading state (used to show a spinner or other loading
+   * indicator).
+   * @param {boolean} loading
+   */
+  onSetLoading(loading) {}
+
+  /**
+   * Handle a change in loading progress. Progress is supplied as a number
+   * between 0.0 and 1.0.
+   * @param {boolean} progress
+   */
+  onSetLoadingProgress(progress) {}
+
+  /**
+   * Handle a change in the set of omnibox suggestions.
+   * @param {Array<Object>} suggestions Array of suggestions with string members
+   * |description| and |url|.
+   */
+  onSetOmniboxSuggestions(suggestions) {}
+
+  /**
+   * Handle a new set of tabs, overwriting the previous state.
+   * @param {Array<Object>} tabs Array of tab states.
+   */
+  onSetTabs(tabs) {}
+
+  /**
+   * Update (or add if not present) a tab.
+   * @param {Object} tab
+   */
+  onUpdateTab(tab) {}
+
+  /**
+   * Remove a tab.
+   * @param {Object} tab
+   */
+  onRemoveTab(tab) {}
+
+  /**
+   * This function is executed after command parsing completes.
+   */
+  onCommandHandlerFinished() {}
+
+  /** @final */
+  handleCommand(dict) {
+    if ('mode' in dict) {
+      this.onSetMode(dict['mode']);
+    }
+    if ('fullscreen' in dict) {
+      this.onSetFullscreen(dict['fullscreen'])
+    }
+    if ('appButtonClicked' in dict) {
+      this.onAppButtonClicked();
+    }
+    if ('securityLevel' in dict) {
+      this.onSetSecurityLevel(dict['securityLevel']);
+    }
+    if ('webVRSecureOrigin' in dict) {
+      this.onSetWebVRSecureOrigin(dict['webVRSecureOrigin']);
+    }
+    if ('enableReloadUi' in dict) {
+      this.onSetReloadUiCapabilityEnabled(dict['enableReloadUi']);
+    }
+    if ('url' in dict) {
+      let url = dict['url'];
+      this.onSetUrl(url['host'], url['path']);
+    }
+    if ('loading' in dict) {
+      this.onSetLoading(dict['loading']);
+    }
+    if ('loadProgress' in dict) {
+      this.onSetLoadingProgress(dict['loadProgress']);
+    }
+    if ('suggestions' in dict) {
+      this.onSetOmniboxSuggestions(dict['suggestions']);
+    }
+    if ('setTabs' in dict) {
+      this.onSetTabs(dict['setTabs']);
+    }
+    if ('updateTab' in dict) {
+      this.onUpdateTab(dict['updateTabs']);
+    }
+    if ('removeTab' in dict) {
+      this.onRemoveTab(dict['removeTab']);
+    }
+
+    this.onCommandHandlerFinished()
+  }
+};