Added flipRtl Support for FieldImages (#2203)

* Added flipRtl support for FieldImages. Added a flipRtl test block.

* Added blockfactory support.

* Fixed JSDoc.

core/block_render_svg.js

@@ -370,21 +370,30 @@ Blockly.BlockSvg.prototype.renderFields_ = function(fieldList,
       continue;
     }
 
+    var translateX;
+    var scale = '';
     if (this.RTL) {
       cursorX -= field.renderSep + field.renderWidth;
-      root.setAttribute('transform',
+      translateX = cursorX;
-          'translate(' + cursorX + ',' + cursorY + ')');
       if (field.renderWidth) {
         cursorX -= Blockly.BlockSvg.SEP_SPACE_X;
       }
     } else {
-      root.setAttribute('transform',
+      translateX = cursorX + field.renderSep;
-          'translate(' + (cursorX + field.renderSep) + ',' + cursorY + ')');
       if (field.renderWidth) {
         cursorX += field.renderSep + field.renderWidth +
             Blockly.BlockSvg.SEP_SPACE_X;
       }
     }
+    if (this.RTL &&
+        field instanceof  Blockly.FieldImage &&
+        field.getFlipRtl()) {
+      scale = 'scale(-1 1)';
+      translateX += field.renderWidth;
+    }
+    root.setAttribute('transform',
+        'translate(' + translateX + ',' + cursorY + ')' + scale);
+
     // Fields are invisible on insertion marker.  They still have to be rendered
     // so that the block can be sized correctly.
     if (this.isInsertionMarker()) {

core/field_image.js

@@ -40,10 +40,12 @@ goog.require('goog.math.Size');
  * @param {string=} opt_alt Optional alt text for when block is collapsed.
  * @param {Function=} opt_onClick Optional function to be called when the image
  *     is clicked.  If opt_onClick is defined, opt_alt must also be defined.
+ * @param {boolean=} opt_flipRtl Whether to flip the icon in RTL.
  * @extends {Blockly.Field}
  * @constructor
  */
-Blockly.FieldImage = function(src, width, height, opt_alt, opt_onClick) {
+Blockly.FieldImage = function(src, width, height,
+    opt_alt, opt_onClick, opt_flipRtl) {
   this.sourceBlock_ = null;
 
   // Ensure height and width are numbers.  Strings are bad at math.
@@ -51,6 +53,7 @@ Blockly.FieldImage = function(src, width, height, opt_alt, opt_onClick) {
   this.width_ = Number(width);
   this.size_ = new goog.math.Size(this.width_,
       this.height_ + 2 * Blockly.BlockSvg.INLINE_PADDING_Y);
+  this.flipRtl_ = opt_flipRtl;
   this.tooltip_ = '';
   this.setValue(src);
   this.setText(opt_alt);
@@ -64,8 +67,8 @@ goog.inherits(Blockly.FieldImage, Blockly.Field);
 /**
  * Construct a FieldImage from a JSON arg object,
  * dereferencing any string table references.
- * @param {!Object} options A JSON object with options (src, width, height, and
+ * @param {!Object} options A JSON object with options (src, width, height,
- *                          alt).
+ *    alt, and flipRtl).
  * @returns {!Blockly.FieldImage} The new field instance.
  * @package
  * @nocollapse
@@ -76,7 +79,8 @@ Blockly.FieldImage.fromJson = function(options) {
   var height =
       Number(Blockly.utils.replaceMessageReferences(options['height']));
   var alt = Blockly.utils.replaceMessageReferences(options['alt']);
-  return new Blockly.FieldImage(src, width, height, alt);
+  var flipRtl = !!options['flipRtl'];
+  return new Blockly.FieldImage(src, width, height, alt, null, flipRtl);
 };
 
 /**
@@ -183,6 +187,14 @@ Blockly.FieldImage.prototype.setValue = function(src) {
   }
 };
 
+/**
+ * Get whether to flip this image in RTL
+ * @return {boolean} True if we should flip in RTL.
+ */
+Blockly.FieldImage.prototype.getFlipRtl = function() {
+  return this.flipRtl_;
+};
+
 /**
  * Set the alt text of this image.
  * @param {?string} alt New alt text.

demos/blockfactory/blocks.js

@@ -603,7 +603,9 @@ Blockly.Blocks['field_image'] = {
         .appendField('height')
         .appendField(new Blockly.FieldNumber('15', 0, NaN, 1), 'HEIGHT')
         .appendField('alt text')
-        .appendField(new Blockly.FieldTextInput('*'), 'ALT');
+        .appendField(new Blockly.FieldTextInput('*'), 'ALT')
+        .appendField('flip RTL')
+        .appendField(new Blockly.FieldCheckbox('false'), 'FLIP_RTL');
     this.setPreviousStatement(true, 'Field');
     this.setNextStatement(true, 'Field');
     this.setTooltip('Static image (JPEG, PNG, GIF, SVG, BMP).\n' +

demos/blockfactory/factory_utils.js

@@ -593,7 +593,8 @@ FactoryUtils.getFieldsJson_ = function(block) {
             src: block.getFieldValue('SRC'),
             width: Number(block.getFieldValue('WIDTH')),
             height: Number(block.getFieldValue('HEIGHT')),
-            alt: block.getFieldValue('ALT')
+            alt: block.getFieldValue('ALT'),
+            flipRtl: block.getFieldValue('FLIP_RTL') == 'TRUE'
           });
           break;
       }

tests/blocks/test_blocks.js

@@ -292,6 +292,21 @@ Blockly.defineBlocksWithJsonArray([  // BEGIN JSON EXTRACT
     ],
     "colour": 160
   },
+  {
+    "type": "image_fliprtl",
+    "message0": "Image flipped RTL %1",
+    "args0": [
+      {
+        "type": "field_image",
+        "src": "media/arrow.png",
+        "width": 50,
+        "height": 50,
+        "alt": "*",
+        "flipRtl": true
+      }
+    ],
+    "colour": 160
+  },
   {
     "type": "image_missing",
     "message0": "Image missing %1",

tests/playground.html

@@ -1212,6 +1212,7 @@ h1 {
       <block type="image_datauri"></block>
       <block type="image_small"></block>
       <block type="image_large"></block>
+      <block type="image_fliprtl"></block>
       <block type="image_missing"></block>
       <block type="test_with_lots_of_network_icons"></block>
       <label text="Unicode & Emojis"></label>