Prevent 'c?a:b' block from performing type violations.

blocks/logic.js

@@ -427,5 +427,36 @@ Blockly.Blocks['logic_ternary'] = {
  .appendField(Blockly.Msg.LOGIC_TERNARY_IF_FALSE);
  this.setOutput(true);
  this.setTooltip(Blockly.Msg.LOGIC_TERNARY_TOOLTIP);
+ this.prevParentConnection_ = null;
+ },
+ /**
+ * Called whenever anything on the workspace changes.
+ * Prevent mismatched types.
+ * @this Blockly.Block
+ */
+ onchange: function() {
+ if (!this.workspace) {
+ // Block has been deleted.
+ return;
+ }
+ var blockA = this.getInputTargetBlock('THEN');
+ var blockB = this.getInputTargetBlock('ELSE');
+ var parentConnection = this.outputConnection.targetConnection;
+ // Kick blocks that existed prior to this change if they don't match.
+ if ((blockA || blockB) && parentConnection) {
+ for (var i = 0; i < 2; i++) {
+ var block = (i == 1) ? blockA : blockB;
+ if (block && !block.outputConnection.checkType_(parentConnection)) {
+ if (parentConnection === this.prevParentConnection_) {
+ this.setParent(null);
+ parentConnection.sourceBlock_.bumpNeighbours_();
+ } else {
+ block.setParent(null);
+ block.bumpNeighbours_();
+ }
+ }
+ }
+ }
+ this.prevParentConnection_ = parentConnection;
  }
 };