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// Copyright (c) 2011 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.
* @constructor
*/
function ImportView() {
const mainBoxId = 'import-view-tab-content';
const loadedDivId = 'import-view-loaded-div';
const loadedClientInfoTextId = 'import-view-loaded-client-info-text';
const loadLogFileDropTargetId = 'import-view-drop-target';
const loadLogFileId = 'import-view-load-log-file';
const loadStatusTextId = 'import-view-load-status-text';
const reloadLinkId = 'import-view-reloaded-link';
DivView.call(this, mainBoxId);
this.loadedDiv_ = $(loadedDivId);
this.loadedClientInfoText_ = $(loadedClientInfoTextId);
this.loadFileElement_ = $(loadLogFileId);
this.loadFileElement_.onchange = this.logFileChanged.bind(this);
this.loadStatusText_ = $(loadStatusTextId);
var dropTarget = $(loadLogFileDropTargetId);
dropTarget.ondragenter = this.onDrag.bind(this);
dropTarget.ondragover = this.onDrag.bind(this);
dropTarget.ondrop = this.onDrop.bind(this);
$(reloadLinkId).onclick = this.clickedReload_.bind(this);
}
inherits(ImportView, DivView);
/**
* 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.
*/
ImportView.prototype.onLoadLogFinish = function(data) {
setNodeDisplay(this.loadedDiv_, true);
this.updateLoadedClientInfo();
return true;
};
/**
* Called when the user clicks the "reloaded" link.
*/
ImportView.prototype.clickedReload_ = function() {
window.location.reload();
return false;
};
/**
* 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.
*/
ImportView.prototype.onDrag = function(event) {
return event.dataTransfer.types.indexOf('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.
*/
ImportView.prototype.onDrop = function(event) {
if (event.dataTransfer.types.indexOf('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.
*/
ImportView.prototype.logFileChanged = function() {
this.loadLogFile(this.loadFileElement_.files[0]);
};
/**
* Attempts to read from the File |logFile|.
*/
ImportView.prototype.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.
*/
ImportView.prototype.onLoadLogFileError = function(event) {
this.loadFileElement_.value = null;
this.setLoadFileStatus(
'Error ' + getKeyWithValue(FileError, event.target.error.code) +
'. Unable to read file.',
false);
};
ImportView.prototype.onLoadLogFile = function(logFile, event) {
var result = loadLogFile(event.target.result, logFile.fileName);
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.
*/
ImportView.prototype.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;
}
};
ImportView.prototype.enableLoadFileElement_ = function(enabled) {
this.loadFileElement_.disabled = !enabled;
};
/**
* Prints some basic information about the environment when the log was made.
*/
ImportView.prototype.updateLoadedClientInfo = function() {
this.loadedClientInfoText_.textContent = '';
if (typeof(ClientInfo) != 'object')
return;
var text = [];
// Dumps made with the command line option don't have a date.
if (ClientInfo.date) {
text.push('Data exported on: ' + ClientInfo.date);
text.push('');
}
text.push(ClientInfo.name +
' ' + ClientInfo.version +
' (' + ClientInfo.official +
' ' + ClientInfo.cl +
') ' + ClientInfo.version_mod);
text.push('OS Type: ' + ClientInfo.os_type);
text.push('Command line: ' + ClientInfo.command_line);
this.loadedClientInfoText_.textContent = text.join('\n');
};
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