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// 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';
// Used in tests.
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) {
var input = new JsEvalContext(logDump);
jstProcess(input, $(ImportView.LOADED_DIV_ID));
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;
})();
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