Initial commit of 001code-html Scratch frontend project.

Includes scratch-gui, scratch-vm, scratch-blocks, scratch-render, scratch-l10n, and deployment config.

Co-authored-by: Cursor <cursoragent@cursor.com>

scratch-blocks/core/events.js

@@ -0,0 +1,429 @@
+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2016 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Events fired as a result of actions in Blockly's editor.
+ * @author fraser@google.com (Neil Fraser)
+ */
+'use strict';
+
+/**
+ * Events fired as a result of actions in Blockly's editor.
+ * @namespace Blockly.Events
+ */
+goog.provide('Blockly.Events');
+
+goog.require('goog.array');
+goog.require('goog.math.Coordinate');
+
+
+/**
+ * Group ID for new events.  Grouped events are indivisible.
+ * @type {string}
+ * @private
+ */
+Blockly.Events.group_ = '';
+
+/**
+ * Sets whether events should be added to the undo stack.
+ * @type {boolean}
+ */
+Blockly.Events.recordUndo = true;
+
+/**
+ * Allow change events to be created and fired.
+ * @type {number}
+ * @private
+ */
+Blockly.Events.disabled_ = 0;
+
+/**
+ * Name of event that creates a block. Will be deprecated for BLOCK_CREATE.
+ * @const
+ */
+Blockly.Events.CREATE = 'create';
+
+/**
+ * Name of event that creates a block.
+ * @const
+ */
+Blockly.Events.BLOCK_CREATE = Blockly.Events.CREATE;
+
+/**
+ * Name of event that deletes a block. Will be deprecated for BLOCK_DELETE.
+ * @const
+ */
+Blockly.Events.DELETE = 'delete';
+
+/**
+ * Name of event that deletes a block.
+ * @const
+ */
+Blockly.Events.BLOCK_DELETE = Blockly.Events.DELETE;
+
+/**
+ * Name of event that changes a block. Will be deprecated for BLOCK_CHANGE.
+ * @const
+ */
+Blockly.Events.CHANGE = 'change';
+
+/**
+ * Name of event that changes a block.
+ * @const
+ */
+Blockly.Events.BLOCK_CHANGE = Blockly.Events.CHANGE;
+
+/**
+ * Name of event that moves a block. Will be deprecated for BLOCK_MOVE.
+ * @const
+ */
+Blockly.Events.MOVE = 'move';
+
+/**
+ * Name of event that drags a block outside of or into the blocks workspace
+ * @const
+ */
+Blockly.Events.DRAG_OUTSIDE = 'dragOutside';
+
+/**
+ * Name of event that ends a block drag
+ * @const
+ */
+Blockly.Events.END_DRAG = 'endDrag';
+
+/**
+ * Name of event that moves a block.
+ * @const
+ */
+Blockly.Events.BLOCK_MOVE = Blockly.Events.MOVE;
+
+/**
+ * Name of event that creates a variable.
+ * @const
+ */
+Blockly.Events.VAR_CREATE = 'var_create';
+
+/**
+ * Name of event that deletes a variable.
+ * @const
+ */
+Blockly.Events.VAR_DELETE = 'var_delete';
+
+/**
+ * Name of event that renames a variable.
+ * @const
+ */
+Blockly.Events.VAR_RENAME = 'var_rename';
+
+/**
+ * Name of event that creates a comment.
+ * @const
+ */
+Blockly.Events.COMMENT_CREATE = 'comment_create';
+
+/**
+ * Name of event that moves a comment.
+ * @const
+ */
+Blockly.Events.COMMENT_MOVE = 'comment_move';
+
+/**
+ * Name of event that changes a comment's property
+ * (text content, size, or minimized state).
+ * @const
+ */
+Blockly.Events.COMMENT_CHANGE = 'comment_change';
+
+/**
+ * Name of event that deletes a comment.
+ * @const
+ */
+Blockly.Events.COMMENT_DELETE = 'comment_delete';
+
+/**
+ * Name of event that records a UI change.
+ * @const
+ */
+Blockly.Events.UI = 'ui';
+
+/**
+ * List of events queued for firing.
+ * @private
+ */
+Blockly.Events.FIRE_QUEUE_ = [];
+
+/**
+ * Create a custom event and fire it.
+ * @param {!Blockly.Events.Abstract} event Custom data for event.
+ */
+Blockly.Events.fire = function(event) {
+  if (!Blockly.Events.isEnabled()) {
+    return;
+  }
+  if (!Blockly.Events.FIRE_QUEUE_.length) {
+    // First event added; schedule a firing of the event queue.
+    setTimeout(Blockly.Events.fireNow_, 0);
+  }
+  Blockly.Events.FIRE_QUEUE_.push(event);
+};
+
+/**
+ * Fire all queued events.
+ * @private
+ */
+Blockly.Events.fireNow_ = function() {
+  var queue = Blockly.Events.filter(Blockly.Events.FIRE_QUEUE_, true);
+  Blockly.Events.FIRE_QUEUE_.length = 0;
+  for (var i = 0, event; event = queue[i]; i++) {
+    var workspace = Blockly.Workspace.getById(event.workspaceId);
+    if (workspace) {
+      workspace.fireChangeListener(event);
+    }
+  }
+};
+
+/**
+ * Filter the queued events and merge duplicates.
+ * @param {!Array.<!Blockly.Events.Abstract>} queueIn Array of events.
+ * @param {boolean} forward True if forward (redo), false if backward (undo).
+ * @return {!Array.<!Blockly.Events.Abstract>} Array of filtered events.
+ */
+Blockly.Events.filter = function(queueIn, forward) {
+  var queue = goog.array.clone(queueIn);
+  if (!forward) {
+    // Undo is merged in reverse order.
+    queue.reverse();
+  }
+  var mergedQueue = [];
+  var hash = Object.create(null);
+  // Merge duplicates.
+  for (var i = 0, event; event = queue[i]; i++) {
+    if (!event.isNull()) {
+      var key = [event.type, event.blockId, event.workspaceId].join(' ');
+
+      var lastEntry = hash[key];
+      var lastEvent = lastEntry ? lastEntry.event : null;
+      if (!lastEntry) {
+        // Each item in the hash table has the event and the index of that event
+        // in the input array.  This lets us make sure we only merge adjacent
+        // move events.
+        hash[key] = {event: event, index: i};
+        mergedQueue.push(event);
+      } else if (event.type == Blockly.Events.MOVE &&
+          lastEntry.index == i - 1) {
+        // Merge move events.
+        lastEvent.newParentId = event.newParentId;
+        lastEvent.newInputName = event.newInputName;
+        lastEvent.newCoordinate = event.newCoordinate;
+        lastEntry.index = i;
+      } else if (event.type == Blockly.Events.CHANGE &&
+          event.element == lastEvent.element &&
+          event.name == lastEvent.name) {
+        // Merge change events.
+        lastEvent.newValue = event.newValue;
+      } else if (event.type == Blockly.Events.UI &&
+          event.element == 'click' &&
+          (lastEvent.element == 'commentOpen' ||
+           lastEvent.element == 'mutatorOpen' ||
+           lastEvent.element == 'warningOpen')) {
+        // Merge click events.
+        lastEvent.newValue = event.newValue;
+      } else {
+        // Collision: newer events should merge into this event to maintain order
+        hash[key] = {event: event, index: 1};
+        mergedQueue.push(event);
+      }
+    }
+  }
+  // Filter out any events that have become null due to merging.
+  queue = mergedQueue.filter(function(e) { return !e.isNull(); });
+  if (!forward) {
+    // Restore undo order.
+    queue.reverse();
+  }
+  // Move mutation events to the top of the queue.
+  // Intentionally skip first event.
+  for (var i = 1, event; event = queue[i]; i++) {
+    if (event.type == Blockly.Events.CHANGE &&
+        event.element == 'mutation') {
+      queue.unshift(queue.splice(i, 1)[0]);
+    }
+  }
+  return queue;
+};
+
+/**
+ * Modify pending undo events so that when they are fired they don't land
+ * in the undo stack.  Called by Blockly.Workspace.clearUndo.
+ */
+Blockly.Events.clearPendingUndo = function() {
+  for (var i = 0, event; event = Blockly.Events.FIRE_QUEUE_[i]; i++) {
+    event.recordUndo = false;
+  }
+};
+
+/**
+ * Stop sending events.  Every call to this function MUST also call enable.
+ */
+Blockly.Events.disable = function() {
+  Blockly.Events.disabled_++;
+};
+
+/**
+ * Start sending events.  Unless events were already disabled when the
+ * corresponding call to disable was made.
+ */
+Blockly.Events.enable = function() {
+  Blockly.Events.disabled_--;
+};
+
+/**
+ * Returns whether events may be fired or not.
+ * @return {boolean} True if enabled.
+ */
+Blockly.Events.isEnabled = function() {
+  return Blockly.Events.disabled_ == 0;
+};
+
+/**
+ * Current group.
+ * @return {string} ID string.
+ */
+Blockly.Events.getGroup = function() {
+  return Blockly.Events.group_;
+};
+
+/**
+ * Start or stop a group.
+ * @param {boolean|string} state True to start new group, false to end group.
+ *   String to set group explicitly.
+ */
+Blockly.Events.setGroup = function(state) {
+  if (typeof state == 'boolean') {
+    Blockly.Events.group_ = state ? Blockly.utils.genUid() : '';
+  } else {
+    Blockly.Events.group_ = state;
+  }
+};
+
+/**
+ * Compute a list of the IDs of the specified block and all its descendants.
+ * @param {!Blockly.Block} block The root block.
+ * @return {!Array.<string>} List of block IDs.
+ * @private
+ */
+Blockly.Events.getDescendantIds_ = function(block) {
+  var ids = [];
+  var descendants = block.getDescendants(false);
+  for (var i = 0, descendant; descendant = descendants[i]; i++) {
+    ids[i] = descendant.id;
+  }
+  return ids;
+};
+
+/**
+ * Decode the JSON into an event.
+ * @param {!Object} json JSON representation.
+ * @param {!Blockly.Workspace} workspace Target workspace for event.
+ * @return {!Blockly.Events.Abstract} The event represented by the JSON.
+ */
+Blockly.Events.fromJson = function(json, workspace) {
+  var event;
+  switch (json.type) {
+    case Blockly.Events.CREATE:
+      event = new Blockly.Events.Create(null);
+      break;
+    case Blockly.Events.DELETE:
+      event = new Blockly.Events.Delete(null);
+      break;
+    case Blockly.Events.CHANGE:
+      event = new Blockly.Events.Change(null);
+      break;
+    case Blockly.Events.MOVE:
+      event = new Blockly.Events.Move(null);
+      break;
+    case Blockly.Events.VAR_CREATE:
+      event = new Blockly.Events.VarCreate(null);
+      break;
+    case Blockly.Events.VAR_DELETE:
+      event = new Blockly.Events.VarDelete(null);
+      break;
+    case Blockly.Events.VAR_RENAME:
+      event = new Blockly.Events.VarRename(null);
+      break;
+    case Blockly.Events.COMMENT_CREATE:
+      event = new Blockly.Events.CommentCreate(null);
+      break;
+    case Blockly.Events.COMMENT_CHANGE:
+      event = new Blockly.Events.CommentChange(null);
+      break;
+    case Blockly.Events.COMMENT_MOVE:
+      event = new Blockly.Events.CommentMove(null);
+      break;
+    case Blockly.Events.COMMENT_DELETE:
+      event = new Blockly.Events.CommentDelete(null);
+      break;
+    case Blockly.Events.UI:
+      event = new Blockly.Events.Ui(null);
+      break;
+    case Blockly.Events.DRAG_OUTSIDE:
+      event = new Blockly.Events.DragBlockOutside(null);
+      break;
+    case Blockly.Events.END_DRAG:
+      event = new Blockly.Events.EndBlockDrag(null, false);
+      break;
+    default:
+      throw 'Unknown event type.';
+  }
+  event.fromJson(json);
+  event.workspaceId = workspace.id;
+  return event;
+};
+
+/**
+ * Enable/disable a block depending on whether it is properly connected.
+ * Use this on applications where all blocks should be connected to a top block.
+ * Recommend setting the 'disable' option to 'false' in the config so that
+ * users don't try to reenable disabled orphan blocks.
+ * @param {!Blockly.Events.Abstract} event Custom data for event.
+ */
+Blockly.Events.disableOrphans = function(event) {
+  if (event.type == Blockly.Events.MOVE ||
+      event.type == Blockly.Events.CREATE) {
+    Blockly.Events.disable();
+    var workspace = Blockly.Workspace.getById(event.workspaceId);
+    var block = workspace.getBlockById(event.blockId);
+    if (block) {
+      if (block.getParent() && !block.getParent().disabled) {
+        var children = block.getDescendants(false);
+        for (var i = 0, child; child = children[i]; i++) {
+          child.setDisabled(false);
+        }
+      } else if ((block.outputConnection || block.previousConnection) &&
+                 !workspace.isDragging()) {
+        do {
+          block.setDisabled(true);
+          block = block.getNextBlock();
+        } while (block);
+      }
+    }
+    Blockly.Events.enable();
+  }
+};