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core/field_label.js

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+/**
+ * Visual Blocks Editor
+ *
+ * Copyright 2012 Google Inc.
+ * http://blockly.googlecode.com/
+ *
+ * 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 Non-editable text field.  Used for titles, labels, etc.
+ * @author fraser@google.com (Neil Fraser)
+ */
+'use strict';
+
+goog.provide('Blockly.FieldLabel');
+
+goog.require('Blockly.Field');
+goog.require('Blockly.Tooltip');
+
+
+/**
+ * Class for a non-editable field.
+ * @param {string} text The initial content of the field.
+ * @extends {Blockly.Field}
+ * @constructor
+ */
+Blockly.FieldLabel = function(text) {
+  this.sourceBlock_ = null;
+  // Build the DOM.
+  this.textElement_ = Blockly.createSvgElement('text',
+      {'class': 'blocklyText'}, null);
+  this.size_ = {height: 25, width: 0};
+  this.setText(text);
+};
+goog.inherits(Blockly.FieldLabel, Blockly.Field);
+
+/**
+ * Editable fields are saved by the XML renderer, non-editable fields are not.
+ */
+Blockly.FieldLabel.prototype.EDITABLE = false;
+
+/**
+ * Install this text on a block.
+ * @param {!Blockly.Block} block The block containing this text.
+ */
+Blockly.FieldLabel.prototype.init = function(block) {
+  if (this.sourceBlock_) {
+    throw 'Text has already been initialized once.';
+  }
+  this.sourceBlock_ = block;
+  block.getSvgRoot().appendChild(this.textElement_);
+
+  // Configure the field to be transparent with respect to tooltips.
+  this.textElement_.tooltip = this.sourceBlock_;
+  Blockly.Tooltip && Blockly.Tooltip.bindMouseEvents(this.textElement_);
+};
+
+/**
+ * Dispose of all DOM objects belonging to this text.
+ */
+Blockly.FieldLabel.prototype.dispose = function() {
+  goog.dom.removeNode(this.textElement_);
+  this.textElement_ = null;
+};
+
+/**
+ * Gets the group element for this field.
+ * Used for measuring the size and for positioning.
+ * @return {!Element} The group element.
+ */
+Blockly.FieldLabel.prototype.getRootElement = function() {
+  return /** @type {!Element} */ (this.textElement_);
+};
+
+/**
+ * Change the tooltip text for this field.
+ * @param {string|!Element} newTip Text for tooltip or a parent element to
+ *     link to for its tooltip.
+ */
+Blockly.FieldLabel.prototype.setTooltip = function(newTip) {
+  this.textElement_.tooltip = newTip;
+};