[polymer] Merge of master into polymer10-migration

netlog_viewer/import_view.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * This view displays options for importing data from a log file.
+ */
+var ImportView = (function() {
+  'use strict';
+
+  // This is defined in index.html, but for all intents and purposes is part
+  // of this view.
+  var LOAD_LOG_FILE_DROP_TARGET_ID = 'import-view-drop-target';
+
+  // We inherit from DivView.
+  var superClass = DivView;
+
+  /**
+   * @constructor
+   */
+  function ImportView() {
+    assertFirstConstructorCall(ImportView);
+
+    // Call superclass's constructor.
+    superClass.call(this, ImportView.MAIN_BOX_ID);
+
+    this.loadedDiv_ = $(ImportView.LOADED_DIV_ID);
+
+    this.loadFileElement_ = $(ImportView.LOAD_LOG_FILE_ID);
+    this.loadFileElement_.onchange = this.logFileChanged.bind(this);
+    this.loadStatusText_ = $(ImportView.LOAD_STATUS_TEXT_ID);
+
+    var dropTarget = $(LOAD_LOG_FILE_DROP_TARGET_ID);
+    dropTarget.ondragenter = this.onDrag.bind(this);
+    dropTarget.ondragover = this.onDrag.bind(this);
+    dropTarget.ondrop = this.onDrop.bind(this);
+  }
+
+  ImportView.TAB_ID = 'tab-handle-import';
+  ImportView.TAB_NAME = 'Import';
+  ImportView.TAB_HASH = '#import';
+
+  // IDs for special HTML elements in import_view.html.
+  ImportView.MAIN_BOX_ID = 'import-view-tab-content';
+  ImportView.LOADED_DIV_ID = 'import-view-loaded-div';
+  ImportView.LOAD_LOG_FILE_ID = 'import-view-load-log-file';
+  ImportView.LOAD_STATUS_TEXT_ID = 'import-view-load-status-text';
+
+  // IDs for HTML elements pertaining to log dump information.
+  ImportView.LOADED_INFO_NUMERIC_DATE_ID = 'import-view-numericDate';
+  ImportView.LOADED_INFO_NAME_ID = 'import-view-name';
+  ImportView.LOADED_INFO_VERSION_ID = 'import-view-version';
+  ImportView.LOADED_INFO_OFFICIAL_ID = 'import-view-official';
+  ImportView.LOADED_INFO_CL_ID = 'import-view-cl';
+  ImportView.LOADED_INFO_VERSION_MOD_ID = 'import-view-version-mod';
+  ImportView.LOADED_INFO_OS_TYPE_ID = 'import-view-os-type';
+  ImportView.LOADED_INFO_COMMAND_LINE_ID = 'import-view-command-line';
+  ImportView.LOADED_INFO_ACTIVE_FIELD_TRIAL_GROUPS_ID =
+      'import-view-activeFieldTrialGroups';
+  ImportView.LOADED_INFO_USER_COMMENTS_ID = 'import-view-user-comments';
+
+  cr.addSingletonGetter(ImportView);
+
+  ImportView.prototype = {
+    // Inherit the superclass's methods.
+    __proto__: superClass.prototype,
+
+    /**
+     * Called when a log file is loaded, after clearing the old log entries and
+     * loading the new ones.  Returns true to indicate the view should
+     * still be visible.
+     */
+    onLoadLogFinish: function(polledData, unused, logDump) {
+      $(ImportView.LOADED_INFO_NUMERIC_DATE_ID).textContent =
+          timeutil.dateToString(new Date(Constants.clientInfo.numericDate));
+      $(ImportView.LOADED_INFO_NAME_ID).textContent =
+          Constants.clientInfo.name;
+      $(ImportView.LOADED_INFO_VERSION_ID).textContent =
+          Constants.clientInfo.version;
+      $(ImportView.LOADED_INFO_OFFICIAL_ID).textContent =
+          Constants.clientInfo.official;
+      $(ImportView.LOADED_INFO_CL_ID).textContent =
+          Constants.clientInfo.cl;
+      $(ImportView.LOADED_INFO_VERSION_MOD_ID).textContent =
+          Constants.clientInfo.version_mod;
+      $(ImportView.LOADED_INFO_OS_TYPE_ID).textContent =
+          Constants.clientInfo.os_type;
+      $(ImportView.LOADED_INFO_COMMAND_LINE_ID).textContent =
+          Constants.clientInfo.command_line;
+      $(ImportView.LOADED_INFO_ACTIVE_FIELD_TRIAL_GROUPS_ID).textContent =
+          Constants.activeFieldTrialGroups;
+
+      if (logDump.userComments != undefined) {
+        $(ImportView.LOADED_INFO_USER_COMMENTS_ID).textContent =
+            logDump.userComments;
+      } else {
+        $(ImportView.LOADED_INFO_USER_COMMENTS_ID).textContent = '';
+      }
+
+      setNodeDisplay(this.loadedDiv_, true);
+      return true;
+    },
+
+    /**
+     * Called when something is dragged over the drop target.
+     *
+     * Returns false to cancel default browser behavior when a single file is
+     * being dragged.  When this happens, we may not receive a list of files for
+     * security reasons, which is why we allow the |files| array to be empty.
+     */
+    onDrag: function(event) {
+      // NOTE: Use Array.prototype.indexOf here is necessary while WebKit
+      // decides which type of data structure dataTransfer.types will be
+      // (currently between DOMStringList and Array). These have different APIs
+      // so assuming one type or the other was breaking things. See
+      // http://crbug.com/115433. TODO(dbeam): Remove when standardized more.
+      var indexOf = Array.prototype.indexOf;
+      return indexOf.call(event.dataTransfer.types, 'Files') == -1 ||
+             event.dataTransfer.files.length > 1;
+    },
+
+    /**
+     * Called when something is dropped onto the drop target.  If it's a single
+     * file, tries to load it as a log file.
+     */
+    onDrop: function(event) {
+      var indexOf = Array.prototype.indexOf;
+      if (indexOf.call(event.dataTransfer.types, 'Files') == -1 ||
+          event.dataTransfer.files.length != 1) {
+        return;
+      }
+      event.preventDefault();
+
+      // Loading a log file may hide the currently active tab.  Switch to the
+      // import tab to prevent this.
+      document.location.hash = 'import';
+
+      this.loadLogFile(event.dataTransfer.files[0]);
+    },
+
+    /**
+     * Called when a log file is selected.
+     *
+     * Gets the log file from the input element and tries to read from it.
+     */
+    logFileChanged: function() {
+      this.loadLogFile(this.loadFileElement_.files[0]);
+    },
+
+    /**
+     * Attempts to read from the File |logFile|.
+     */
+    loadLogFile: function(logFile) {
+      if (logFile) {
+        this.setLoadFileStatus('Loading log...', true);
+        var fileReader = new FileReader();
+
+        fileReader.onload = this.onLoadLogFile.bind(this, logFile);
+        fileReader.onerror = this.onLoadLogFileError.bind(this);
+
+        fileReader.readAsText(logFile);
+      }
+    },
+
+    /**
+     * Displays an error message when unable to read the selected log file.
+     * Also clears the file input control, so the same file can be reloaded.
+     */
+    onLoadLogFileError: function(event) {
+      this.loadFileElement_.value = null;
+      this.setLoadFileStatus(
+          'Error ' + getKeyWithValue(FileError, event.target.error.code) +
+              '.  Unable to read file.',
+          false);
+    },
+
+    onLoadLogFile: function(logFile, event) {
+      var result = log_util.loadLogFile(event.target.result, logFile.name);
+      this.setLoadFileStatus(result, false);
+    },
+
+    /**
+     * Sets the load from file status text, displayed below the load file
+     * button, to |text|.  Also enables or disables the load buttons based on
+     * the value of |isLoading|, which must be true if the load process is still
+     * ongoing, and false when the operation has stopped, regardless of success
+     * of failure.  Also, when loading is done, replaces the load button so the
+     * same file can be loaded again.
+     */
+    setLoadFileStatus: function(text, isLoading) {
+      this.enableLoadFileElement_(!isLoading);
+      this.loadStatusText_.textContent = text;
+
+      if (!isLoading) {
+        // Clear the button, so the same file can be reloaded.  Recreating the
+        // element seems to be the only way to do this.
+        var loadFileElementId = this.loadFileElement_.id;
+        var loadFileElementOnChange = this.loadFileElement_.onchange;
+        this.loadFileElement_.outerHTML = this.loadFileElement_.outerHTML;
+        this.loadFileElement_ = $(loadFileElementId);
+        this.loadFileElement_.onchange = loadFileElementOnChange;
+      }
+
+      // Style the log output differently depending on what just happened.
+      var pos = text.indexOf('Log loaded.');
+      if (isLoading) {
+        this.loadStatusText_.className = 'import-view-pending-log';
+      } else if (pos == 0) {
+        this.loadStatusText_.className = 'import-view-success-log';
+      } else if (pos != -1) {
+        this.loadStatusText_.className = 'import-view-warning-log';
+      } else {
+        this.loadStatusText_.className = 'import-view-error-log';
+      }
+    },
+
+    enableLoadFileElement_: function(enabled) {
+      this.loadFileElement_.disabled = !enabled;
+    },
+  };
+
+  return ImportView;
+})();
+