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/**
* @license
* Visual Blocks Editor
*
* Copyright 2012 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 Image field. Used for titles, labels, etc.
* @author fraser@google.com (Neil Fraser)
*/
'use strict';
goog.provide('Blockly.FieldImage');
goog.require('Blockly.Field');
goog.require('goog.dom');
goog.require('goog.math.Size');
goog.require('goog.userAgent');
/**
* Class for an image.
* @param {string} src The URL of the image.
* @param {number} width Width of the image.
* @param {number} height Height of the image.
* @param {string=} opt_alt Optional alt text for when block is collapsed.
* @extends {Blockly.Field}
* @constructor
*/
Blockly.FieldImage = function(src, width, height, opt_alt) {
this.sourceBlock_ = null;
// Ensure height and width are numbers. Strings are bad at math.
this.height_ = Number(height);
this.width_ = Number(width);
this.size_ = new goog.math.Size(this.width_,
this.height_ + 2 * Blockly.BlockSvg.INLINE_PADDING_Y);
this.text_ = opt_alt || '';
this.setValue(src);
};
goog.inherits(Blockly.FieldImage, Blockly.Field);
/**
* Rectangular mask used by Firefox.
* @type {Element}
* @private
*/
Blockly.FieldImage.prototype.rectElement_ = null;
/**
* Editable fields are saved by the XML renderer, non-editable fields are not.
*/
Blockly.FieldImage.prototype.EDITABLE = false;
/**
* Install this image on a block.
*/
Blockly.FieldImage.prototype.init = function() {
if (this.fieldGroup_) {
// Image has already been initialized once.
return;
}
// Build the DOM.
/** @type {SVGElement} */
this.fieldGroup_ = Blockly.createSvgElement('g', {}, null);
if (!this.visible_) {
this.fieldGroup_.style.display = 'none';
}
/** @type {SVGElement} */
this.imageElement_ = Blockly.createSvgElement('image',
{'height': this.height_ + 'px',
'width': this.width_ + 'px'}, this.fieldGroup_);
this.setValue(this.src_);
if (goog.userAgent.GECKO) {
/**
* Due to a Firefox bug which eats mouse events on image elements,
* a transparent rectangle needs to be placed on top of the image.
* @type {SVGElement}
*/
this.rectElement_ = Blockly.createSvgElement('rect',
{'height': this.height_ + 'px',
'width': this.width_ + 'px',
'fill-opacity': 0}, this.fieldGroup_);
}
this.sourceBlock_.getSvgRoot().appendChild(this.fieldGroup_);
// Configure the field to be transparent with respect to tooltips.
var topElement = this.rectElement_ || this.imageElement_;
topElement.tooltip = this.sourceBlock_;
Blockly.Tooltip.bindMouseEvents(topElement);
};
/**
* Dispose of all DOM objects belonging to this text.
*/
Blockly.FieldImage.prototype.dispose = function() {
goog.dom.removeNode(this.fieldGroup_);
this.fieldGroup_ = null;
this.imageElement_ = null;
this.rectElement_ = null;
};
/**
* 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.FieldImage.prototype.setTooltip = function(newTip) {
var topElement = this.rectElement_ || this.imageElement_;
topElement.tooltip = newTip;
};
/**
* Get the source URL of this image.
* @return {string} Current text.
* @override
*/
Blockly.FieldImage.prototype.getValue = function() {
return this.src_;
};
/**
* Set the source URL of this image.
* @param {?string} src New source.
* @override
*/
Blockly.FieldImage.prototype.setValue = function(src) {
if (src === null) {
// No change if null.
return;
}
this.src_ = src;
if (this.imageElement_) {
this.imageElement_.setAttributeNS('http://www.w3.org/1999/xlink',
'xlink:href', goog.isString(src) ? src : '');
}
};
/**
* Set the alt text of this image.
* @param {?string} alt New alt text.
* @override
*/
Blockly.FieldImage.prototype.setText = function(alt) {
if (alt === null) {
// No change if null.
return;
}
this.text_ = alt;
};
/**
* Images are fixed width, no need to render.
* @private
*/
Blockly.FieldImage.prototype.render_ = function() {
// NOP
};
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