Fix #1345. Android triggers a window resize event when the soft keyb…

core/blockly.js

@@ -315,8 +315,29 @@ Blockly.onContextMenu_ = function(e) {
  * @param {boolean=} opt_allowToolbox If true, don't close the toolbox.
  */
 Blockly.hideChaff = function(opt_allowToolbox) {
-  Blockly.Tooltip.hide();
+  Blockly.hideChaffInternal_(opt_allowToolbox);
   Blockly.WidgetDiv.hide(true);
+};
+
+/**
+ * Close tooltips, context menus, dropdown selections, etc.
+ * For some elements (e.g. field text inputs), rather than hiding, it will
+ * move them.
+ * @param {boolean=} opt_allowToolbox If true, don't close the toolbox.
+ */
+Blockly.hideChaffOnResize = function(opt_allowToolbox) {
+  Blockly.hideChaffInternal_(opt_allowToolbox);
+  Blockly.WidgetDiv.repositionForWindowResize();
+};
+
+/**
+ * Does a majority of the work for hideChaff including tooltips, dropdowns,
+ * toolbox, etc. It does not deal with the WidgetDiv.
+ * @param {boolean=} opt_allowToolbox If true, don't close the toolbox.
+ * @private
+ */
+Blockly.hideChaffInternal_ = function(opt_allowToolbox) {
+  Blockly.Tooltip.hide();
   Blockly.DropDownDiv.hideWithoutAnimation();
   if (!opt_allowToolbox) {
     var workspace = Blockly.getMainWorkspace();

core/inject.js

@@ -364,7 +364,7 @@ Blockly.init_ = function(mainWorkspace) {
   var workspaceResizeHandler = Blockly.bindEventWithChecks_(window, 'resize',
       null,
       function() {
-        Blockly.hideChaff(true);
+        Blockly.hideChaffOnResize(true);
         Blockly.svgResize(mainWorkspace);
       });
   mainWorkspace.setResizeHandlerWrapper(workspaceResizeHandler);

core/widgetdiv.js

@@ -122,6 +122,27 @@ Blockly.WidgetDiv.show = function(newOwner, rtl, opt_dispose,
   Blockly.WidgetDiv.DIV.style.display = 'block';
 };
 
+/**
+ *  Repositions the widgetDiv on window resize. If it doesn't know how to
+ *  calculate the new position, it wll just hide it instead.
+ */
+Blockly.WidgetDiv.repositionForWindowResize = function() {
+  // This condition mainly catches the widget div when it is being used as a
+  // text input.  It is important not to close it in this case because on Android,
+  // when a field is focused, the soft keyboard opens triggering a window resize
+  // event and we want the widget div to stick around so users can type into it.
+  if (Blockly.WidgetDiv.owner_
+      && Blockly.WidgetDiv.owner_.getScaledBBox_
+      && Blockly.WidgetDiv.owner_.getSize) {
+    var widgetScaledBBox = Blockly.WidgetDiv.owner_.getScaledBBox_();
+    var widgetSize = Blockly.WidgetDiv.owner_.getSize();
+    Blockly.WidgetDiv.positionInternal_(widgetScaledBBox.left, widgetScaledBBox.top,
+        widgetSize.height);
+  } else {
+    Blockly.WidgetDiv.hide();
+  }
+};
+
 /**
  * Destroy the widget and hide the div.
  * @param {boolean=} opt_noAnimate If set, animation will not be run for the hide.