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app_controller.js
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app_controller.js
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/**
* @license
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @fileoverview The AppController Class brings together the Block
* Factory, Block Library, and Block Exporter functionality into a single web
* app.
*
* @author quachtina96 (Tina Quach)
*/
/**
* Controller for the Blockly Factory
* @constructor
*/
AppController = function() {
// Initialize Block Library
this.blockLibraryName = 'blockLibrary';
this.blockLibraryController =
new BlockLibraryController(this.blockLibraryName);
this.blockLibraryController.populateBlockLibrary();
// Construct Workspace Factory Controller.
this.workspaceFactoryController = new WorkspaceFactoryController
('workspacefactory_toolbox', 'toolbox_blocks', 'preview_blocks');
// Initialize Block Exporter
this.exporter =
new BlockExporterController(this.blockLibraryController.storage);
// Map of tab type to the div element for the tab.
this.tabMap = Object.create(null);
this.tabMap[AppController.BLOCK_FACTORY] =
document.getElementById('blockFactory_tab');
this.tabMap[AppController.WORKSPACE_FACTORY] =
document.getElementById('workspaceFactory_tab');
this.tabMap[AppController.EXPORTER] =
document.getElementById('blocklibraryExporter_tab');
// Last selected tab.
this.lastSelectedTab = null;
// Selected tab.
this.selectedTab = AppController.BLOCK_FACTORY;
};
// Constant values representing the three tabs in the controller.
AppController.BLOCK_FACTORY = 'BLOCK_FACTORY';
AppController.WORKSPACE_FACTORY = 'WORKSPACE_FACTORY';
AppController.EXPORTER = 'EXPORTER';
/**
* Tied to the 'Import Block Library' button. Imports block library from file to
* Block Factory. Expects user to upload a single file of JSON mapping each
* block type to its XML text representation.
*/
AppController.prototype.importBlockLibraryFromFile = function() {
var self = this;
var files = document.getElementById('files');
// If the file list is empty, the user likely canceled in the dialog.
if (files.files.length > 0) {
BlocklyDevTools.Analytics.onImport(
BlocklyDevTools.Analytics.BLOCK_FACTORY_LIBRARY,
{ format: BlocklyDevTools.Analytics.FORMAT_XML });
// The input tag doesn't have the "multiple" attribute
// so the user can only choose 1 file.
var file = files.files[0];
var fileReader = new FileReader();
// Create a map of block type to XML text from the file when it has been
// read.
fileReader.addEventListener('load', function(event) {
var fileContents = event.target.result;
// Create empty object to hold the read block library information.
var blockXmlTextMap = Object.create(null);
try {
// Parse the file to get map of block type to XML text.
blockXmlTextMap = self.formatBlockLibraryForImport_(fileContents);
} catch (e) {
var message = 'Could not load your block library file.\n'
window.alert(message + '\nFile Name: ' + file.name);
return;
}
// Create a new block library storage object with inputted block library.
var blockLibStorage = new BlockLibraryStorage(
self.blockLibraryName, blockXmlTextMap);
// Update block library controller with the new block library
// storage.
self.blockLibraryController.setBlockLibraryStorage(blockLibStorage);
// Update the block library dropdown.
self.blockLibraryController.populateBlockLibrary();
// Update the exporter's block library storage.
self.exporter.setBlockLibraryStorage(blockLibStorage);
});
// Read the file.
fileReader.readAsText(file);
}
};
/**
* Tied to the 'Export Block Library' button. Exports block library to file that
* contains JSON mapping each block type to its XML text representation.
*/
AppController.prototype.exportBlockLibraryToFile = function() {
// Get map of block type to XML.
var blockLib = this.blockLibraryController.getBlockLibrary();
// Concatenate the XMLs, each separated by a blank line.
var blockLibText = this.formatBlockLibraryForExport_(blockLib);
// Get file name.
var filename = prompt('Enter the file name under which to save your block ' +
'library.', 'library.xml');
// Download file if all necessary parameters are provided.
if (filename) {
FactoryUtils.createAndDownloadFile(blockLibText, filename, 'xml');
BlocklyDevTools.Analytics.onExport(
BlocklyDevTools.Analytics.BLOCK_FACTORY_LIBRARY,
{ format: BlocklyDevTools.Analytics.FORMAT_XML });
} else {
var msg = 'Could not export Block Library without file name under which ' +
'to save library.';
BlocklyDevTools.Analytics.onWarning(msg);
alert(msg);
}
};
/**
* Converts an object mapping block type to XML to text file for output.
* @param {!Object} blockXmlMap Object mapping block type to XML.
* @return {string} XML text containing the block XMLs.
* @private
*/
AppController.prototype.formatBlockLibraryForExport_ = function(blockXmlMap) {
// Create DOM for XML.
var xmlDom = Blockly.utils.xml.createElement('xml');
// Append each block node to XML DOM.
for (var blockType in blockXmlMap) {
var blockXmlDom = Blockly.Xml.textToDom(blockXmlMap[blockType]);
var blockNode = blockXmlDom.firstElementChild;
xmlDom.appendChild(blockNode);
}
// Return the XML text.
return Blockly.Xml.domToText(xmlDom);
};
/**
* Converts imported block library to an object mapping block type to block XML.
* @param {string} xmlText String representation of an XML with each block as
* a child node.
* @return {!Object} Object mapping block type to XML text.
* @private
*/
AppController.prototype.formatBlockLibraryForImport_ = function(xmlText) {
var inputXml = Blockly.Xml.textToDom(xmlText);
// Convert the live HTMLCollection of child Elements into a static array,
// since the addition to editorWorkspaceXml below removes it from inputXml.
var inputChildren = Array.from(inputXml.children);
// Create empty map. The line below creates a truly empty object. It doesn't
// have built-in attributes/functions such as length or toString.
var blockXmlTextMap = Object.create(null);
// Populate map.
for (var i = 0, blockNode; blockNode = inputChildren[i]; i++) {
// Add outer XML tag to the block for proper injection in to the
// main workspace.
// Create DOM for XML.
var editorWorkspaceXml = Blockly.utils.xml.createElement('xml');
editorWorkspaceXml.appendChild(blockNode);
xmlText = Blockly.Xml.domToText(editorWorkspaceXml);
// All block types should be lowercase.
var blockType = this.getBlockTypeFromXml_(xmlText).toLowerCase();
// Some names are invalid so fix them up.
blockType = FactoryUtils.cleanBlockType(blockType);
blockXmlTextMap[blockType] = xmlText;
}
return blockXmlTextMap;
};
/**
* Extracts out block type from XML text, the kind that is saved in block
* library storage.
* @param {string} xmlText A block's XML text.
* @return {string} The block type that corresponds to the provided XML text.
* @private
*/
AppController.prototype.getBlockTypeFromXml_ = function(xmlText) {
var xmlDom = Blockly.Xml.textToDom(xmlText);
// Find factory base block.
var factoryBaseBlockXml = xmlDom.getElementsByTagName('block')[0];
// Get field elements from factory base.
var fields = factoryBaseBlockXml.getElementsByTagName('field');
for (var i = 0; i < fields.length; i++) {
// The field whose name is 'NAME' holds the block type as its value.
if (fields[i].getAttribute('name') == 'NAME') {
return fields[i].childNodes[0].nodeValue;
}
}
};
/**
* Add click handlers to each tab to allow switching between the Block Factory,
* Workspace Factory, and Block Exporter tab.
* @param {!Object} tabMap Map of tab name to div element that is the tab.
*/
AppController.prototype.addTabHandlers = function(tabMap) {
var self = this;
for (var tabName in tabMap) {
var tab = tabMap[tabName];
// Use an additional closure to correctly assign the tab callback.
tab.addEventListener('click', self.makeTabClickHandler_(tabName));
}
};
/**
* Set the selected tab.
* @param {string} tabName AppController.BLOCK_FACTORY,
* AppController.WORKSPACE_FACTORY, or AppController.EXPORTER
* @private
*/
AppController.prototype.setSelected_ = function(tabName) {
this.lastSelectedTab = this.selectedTab;
this.selectedTab = tabName;
};
/**
* Creates the tab click handler specific to the tab specified.
* @param {string} tabName AppController.BLOCK_FACTORY,
* AppController.WORKSPACE_FACTORY, or AppController.EXPORTER
* @return {!Function} The tab click handler.
* @private
*/
AppController.prototype.makeTabClickHandler_ = function(tabName) {
var self = this;
return function() {
self.setSelected_(tabName);
self.onTab();
};
};
/**
* Called on each tab click. Hides and shows specific content based on which tab
* (Block Factory, Workspace Factory, or Exporter) is selected.
*/
AppController.prototype.onTab = function() {
// Get tab div elements.
var blockFactoryTab = this.tabMap[AppController.BLOCK_FACTORY];
var exporterTab = this.tabMap[AppController.EXPORTER];
var workspaceFactoryTab = this.tabMap[AppController.WORKSPACE_FACTORY];
// Warn user if they have unsaved changes when leaving Block Factory.
if (this.lastSelectedTab == AppController.BLOCK_FACTORY &&
this.selectedTab != AppController.BLOCK_FACTORY) {
var hasUnsavedChanges =
!FactoryUtils.savedBlockChanges(this.blockLibraryController);
if (hasUnsavedChanges) {
var msg = 'You have unsaved changes in Block Factory.';
var continueAnyway = confirm(msg);
BlocklyDevTools.Analytics.onWarning(msg);
if (!continueAnyway) {
// If the user doesn't want to switch tabs with unsaved changes,
// stay on Block Factory Tab.
this.setSelected_(AppController.BLOCK_FACTORY);
this.lastSelectedTab = AppController.BLOCK_FACTORY;
return;
}
}
}
// Only enable key events in workspace factory if workspace factory tab is
// selected.
this.workspaceFactoryController.keyEventsEnabled =
this.selectedTab == AppController.WORKSPACE_FACTORY;
// Turn selected tab on and other tabs off.
this.styleTabs_();
if (this.selectedTab == AppController.EXPORTER) {
BlocklyDevTools.Analytics.onNavigateTo('Exporter');
// Hide other tabs.
FactoryUtils.hide('workspaceFactoryContent');
FactoryUtils.hide('blockFactoryContent');
// Show exporter tab.
FactoryUtils.show('blockLibraryExporter');
// Need accurate state in order to know which blocks are used in workspace
// factory.
this.workspaceFactoryController.saveStateFromWorkspace();
// Update exporter's list of the types of blocks used in workspace factory.
var usedBlockTypes = this.workspaceFactoryController.getAllUsedBlockTypes();
this.exporter.setUsedBlockTypes(usedBlockTypes);
// Update exporter's block selector to reflect current block library.
this.exporter.updateSelector();
// Update the exporter's preview to reflect any changes made to the blocks.
this.exporter.updatePreview();
} else if (this.selectedTab == AppController.BLOCK_FACTORY) {
BlocklyDevTools.Analytics.onNavigateTo('BlockFactory');
// Hide other tabs.
FactoryUtils.hide('blockLibraryExporter');
FactoryUtils.hide('workspaceFactoryContent');
// Show Block Factory.
FactoryUtils.show('blockFactoryContent');
} else if (this.selectedTab == AppController.WORKSPACE_FACTORY) {
// TODO: differentiate Workspace and Toolbox editor, based on the other tab state.
BlocklyDevTools.Analytics.onNavigateTo('WorkspaceFactory');
// Hide other tabs.
FactoryUtils.hide('blockLibraryExporter');
FactoryUtils.hide('blockFactoryContent');
// Show workspace factory container.
FactoryUtils.show('workspaceFactoryContent');
// Update block library category.
var categoryXml = this.exporter.getBlockLibraryCategory();
var blockTypes = this.blockLibraryController.getStoredBlockTypes();
this.workspaceFactoryController.setBlockLibCategory(categoryXml,
blockTypes);
}
// Resize to render workspaces' toolboxes correctly for all tabs.
window.dispatchEvent(new Event('resize'));
};
/**
* Called on each tab click. Styles the tabs to reflect which tab is selected.
* @private
*/
AppController.prototype.styleTabs_ = function() {
for (var tabName in this.tabMap) {
if (this.selectedTab == tabName) {
this.tabMap[tabName].classList.replace('taboff', 'tabon');
} else {
this.tabMap[tabName].classList.replace('tabon', 'taboff');
}
}
};
/**
* Assign button click handlers for the exporter.
*/
AppController.prototype.assignExporterClickHandlers = function() {
var self = this;
document.getElementById('button_setBlocks').addEventListener('click',
function() {
self.openModal('dropdownDiv_setBlocks');
});
document.getElementById('dropdown_addAllUsed').addEventListener('click',
function() {
self.exporter.selectUsedBlocks();
self.exporter.updatePreview();
self.closeModal();
});
document.getElementById('dropdown_addAllFromLib').addEventListener('click',
function() {
self.exporter.selectAllBlocks();
self.exporter.updatePreview();
self.closeModal();
});
document.getElementById('clearSelectedButton').addEventListener('click',
function() {
self.exporter.clearSelectedBlocks();
self.exporter.updatePreview();
});
// Export blocks when the user submits the export settings.
document.getElementById('exporterSubmitButton').addEventListener('click',
function() {
self.exporter.export();
});
};
/**
* Assign change listeners for the exporter. These allow for the dynamic update
* of the exporter preview.
*/
AppController.prototype.assignExporterChangeListeners = function() {
var self = this;
var blockDefCheck = document.getElementById('blockDefCheck');
var genStubCheck = document.getElementById('genStubCheck');
// Select the block definitions and generator stubs on default.
blockDefCheck.checked = true;
genStubCheck.checked = true;
// Checking the block definitions checkbox displays preview of code to export.
document.getElementById('blockDefCheck').addEventListener('change',
function(e) {
self.ifCheckedEnable(blockDefCheck.checked,
['blockDefs', 'blockDefSettings']);
});
// Preview updates when user selects different block definition format.
document.getElementById('exportFormat').addEventListener('change',
function(e) {
self.exporter.updatePreview();
});
// Checking the generator stub checkbox displays preview of code to export.
document.getElementById('genStubCheck').addEventListener('change',
function(e) {
self.ifCheckedEnable(genStubCheck.checked,
['genStubs', 'genStubSettings']);
});
// Preview updates when user selects different generator stub language.
document.getElementById('exportLanguage').addEventListener('change',
function(e) {
self.exporter.updatePreview();
});
};
/**
* If given checkbox is checked, enable the given elements. Otherwise, disable.
* @param {boolean} enabled True if enabled, false otherwise.
* @param {!Array<string>} idArray Array of element IDs to enable when
* checkbox is checked.
*/
AppController.prototype.ifCheckedEnable = function(enabled, idArray) {
for (var i = 0, id; id = idArray[i]; i++) {
var element = document.getElementById(id);
if (enabled) {
element.classList.remove('disabled');
} else {
element.classList.add('disabled');
}
var fields = element.querySelectorAll('input, textarea, select');
for (var j = 0, field; field = fields[j]; j++) {
field.disabled = !enabled;
}
}
};
/**
* Assign button click handlers for the block library.
*/
AppController.prototype.assignLibraryClickHandlers = function() {
var self = this;
// Button for saving block to library.
document.getElementById('saveToBlockLibraryButton').addEventListener('click',
function() {
self.blockLibraryController.saveToBlockLibrary();
});
// Button for removing selected block from library.
document.getElementById('removeBlockFromLibraryButton').addEventListener(
'click',
function() {
self.blockLibraryController.removeFromBlockLibrary();
});
// Button for clearing the block library.
document.getElementById('clearBlockLibraryButton').addEventListener('click',
function() {
self.blockLibraryController.clearBlockLibrary();
});
// Hide and show the block library dropdown.
document.getElementById('button_blockLib').addEventListener('click',
function() {
self.openModal('dropdownDiv_blockLib');
});
};
/**
* Assign button click handlers for the block factory.
*/
AppController.prototype.assignBlockFactoryClickHandlers = function() {
var self = this;
// Assign button event handlers for Block Factory.
document.getElementById('localSaveButton')
.addEventListener('click', function() {
self.exportBlockLibraryToFile();
});
document.getElementById('helpButton').addEventListener('click',
function() {
open('https://developers.google.com/blockly/custom-blocks/block-factory',
'BlockFactoryHelp');
});
document.getElementById('files').addEventListener('change',
function() {
// Warn user.
var replace = confirm('This imported block library will ' +
'replace your current block library.');
if (replace) {
self.importBlockLibraryFromFile();
// Clear this so that the change event still fires even if the
// same file is chosen again. If the user re-imports a file, we
// want to reload the workspace with its contents.
this.value = null;
}
});
document.getElementById('createNewBlockButton')
.addEventListener('click', function() {
// If there are unsaved changes warn user, check if they'd like to
// proceed with unsaved changes, and act accordingly.
var proceedWithUnsavedChanges =
self.blockLibraryController.warnIfUnsavedChanges();
if (!proceedWithUnsavedChanges) {
return;
}
BlockFactory.showStarterBlock();
self.blockLibraryController.setNoneSelected();
// Close the Block Library Dropdown.
self.closeModal();
});
};
/**
* Add event listeners for the block factory.
*/
AppController.prototype.addBlockFactoryEventListeners = function() {
// Update code on changes to block being edited.
BlockFactory.mainWorkspace.addChangeListener(BlockFactory.updateLanguage);
// Disable blocks not attached to the factory_base block.
BlockFactory.mainWorkspace.addChangeListener(Blockly.Events.disableOrphans);
// Update the buttons on the screen based on whether
// changes have been saved.
var self = this;
BlockFactory.mainWorkspace.addChangeListener(function() {
self.blockLibraryController.updateButtons(FactoryUtils.savedBlockChanges(
self.blockLibraryController));
});
document.getElementById('direction')
.addEventListener('change', BlockFactory.updatePreview);
document.getElementById('languageTA')
.addEventListener('change', BlockFactory.manualEdit);
document.getElementById('languageTA')
.addEventListener('keyup', BlockFactory.manualEdit);
document.getElementById('format')
.addEventListener('change', BlockFactory.formatChange);
document.getElementById('language')
.addEventListener('change', BlockFactory.updatePreview);
};
/**
* Handle Blockly Storage with App Engine.
*/
AppController.prototype.initializeBlocklyStorage = function() {
BlocklyStorage.HTTPREQUEST_ERROR =
'There was a problem with the request.\n';
BlocklyStorage.LINK_ALERT =
'Share your blocks with this public link. We\'ll delete them if not used for a year. They are not associated with your account and handled as per Google\'s Privacy Policy. Please be sure not to include any private information.:\n\n%1';
BlocklyStorage.HASH_ERROR =
'Sorry, "%1" doesn\'t correspond with any saved Blockly file.';
BlocklyStorage.XML_ERROR = 'Could not load your saved file.\n' +
'Perhaps it was created with a different version of Blockly?';
var linkButton = document.getElementById('linkButton');
linkButton.style.display = 'inline-block';
linkButton.addEventListener('click',
function() {
BlocklyStorage.link(BlockFactory.mainWorkspace);});
BlockFactory.disableEnableLink();
};
/**
* Handle resizing of elements.
*/
AppController.prototype.onresize = function(event) {
if (this.selectedTab == AppController.BLOCK_FACTORY) {
// Handle resizing of Block Factory elements.
var expandList = [
document.getElementById('blocklyPreviewContainer'),
document.getElementById('blockly'),
document.getElementById('blocklyMask'),
document.getElementById('preview'),
document.getElementById('languagePre'),
document.getElementById('languageTA'),
document.getElementById('generatorPre'),
];
for (var i = 0, expand; expand = expandList[i]; i++) {
expand.style.width = (expand.parentNode.offsetWidth - 2) + 'px';
expand.style.height = (expand.parentNode.offsetHeight - 2) + 'px';
}
} else if (this.selectedTab == AppController.EXPORTER) {
// Handle resize of Exporter block options.
this.exporter.view.centerPreviewBlocks();
}
};
/**
* Handler for the window's 'beforeunload' event. When a user has unsaved
* changes and refreshes or leaves the page, confirm that they want to do so
* before actually refreshing.
* @param {!Event} e beforeunload event.
*/
AppController.prototype.confirmLeavePage = function(e) {
BlocklyDevTools.Analytics.sendQueued();
if ((!BlockFactory.isStarterBlock() &&
!FactoryUtils.savedBlockChanges(blocklyFactory.blockLibraryController)) ||
blocklyFactory.workspaceFactoryController.hasUnsavedChanges()) {
var confirmationMessage = 'You will lose any unsaved changes. ' +
'Are you sure you want to exit this page?';
BlocklyDevTools.Analytics.onWarning(confirmationMessage);
e.returnValue = confirmationMessage;
return confirmationMessage;
}
};
/**
* Show a modal element, usually a dropdown list.
* @param {string} id ID of element to show.
*/
AppController.prototype.openModal = function(id) {
Blockly.hideChaff();
this.modalName_ = id;
document.getElementById(id).style.display = 'block';
document.getElementById('modalShadow').style.display = 'block';
};
/**
* Hide a previously shown modal element.
*/
AppController.prototype.closeModal = function() {
var id = this.modalName_;
if (!id) {
return;
}
document.getElementById(id).style.display = 'none';
document.getElementById('modalShadow').style.display = 'none';
this.modalName_ = null;
};
/**
* Name of currently open modal.
* @type {string?}
* @private
*/
AppController.prototype.modalName_ = null;
/**
* Initialize Blockly and layout. Called on page load.
*/
AppController.prototype.init = function() {
var self = this;
// Handle Blockly Storage with App Engine.
if ('BlocklyStorage' in window) {
this.initializeBlocklyStorage();
}
// Assign click handlers.
this.assignExporterClickHandlers();
this.assignLibraryClickHandlers();
this.assignBlockFactoryClickHandlers();
// Hide and show the block library dropdown.
document.getElementById('modalShadow').addEventListener('click',
function() {
self.closeModal();
});
this.onresize();
window.addEventListener('resize', function() {
self.onresize();
});
// Inject Block Factory Main Workspace.
var toolbox = document.getElementById('blockfactory_toolbox');
BlockFactory.mainWorkspace = Blockly.inject('blockly',
{collapse: false,
toolbox: toolbox,
comments: false,
disable: false,
media: '../../media/'});
// Add tab handlers for switching between Block Factory and Block Exporter.
this.addTabHandlers(this.tabMap);
// Assign exporter change listeners.
this.assignExporterChangeListeners();
// Create the root block on Block Factory main workspace.
if ('BlocklyStorage' in window && window.location.hash.length > 1) {
BlocklyStorage.retrieveXml(window.location.hash.substring(1),
BlockFactory.mainWorkspace);
} else {
BlockFactory.showStarterBlock();
}
BlockFactory.mainWorkspace.clearUndo();
// Add Block Factory event listeners.
this.addBlockFactoryEventListeners();
// Workspace Factory init.
WorkspaceFactoryInit.initWorkspaceFactory(this.workspaceFactoryController);
};