User Manual
Finding Parent Screen Item
Screen Item has parent screen item
{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"ScreenItem_ScreenItem_hasParent\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">screenItem</field></block></value></block></xml>"}
This block is used for checking the variable has parent screen item or not.
Parameters: Screen Item
Output: Boolean (True/False)
Sample code:
Here is using one if condition to remove the screen item.
{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"controls_if\"><value name=\"IF0\"><shadow type=\"logic_boolean\"><field name=\"BOOL\">TRUE</field></shadow><block type=\"ScreenItem_ScreenItem_hasParent\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value></block></value><statement name=\"DO0\"><block type=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value></block></statement></block></xml>"}
{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>removeParentBtn</variable><variable>removeChildBtn</variable><variable>parent</variable><variable>child</variable></variables><block type=\"pxt-on-start\" x=\"0\" y=\"0\"><statement name=\"HANDLER\"><block type=\"variables_set\"><field name=\"VAR\">mainLayout</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"variables_set\"><field name=\"VAR\">mainScreen</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Screen_create\"><value name=\"label\"><shadow type=\"text\"><field name=\"TEXT\">Main</field></shadow></value><value name=\"layout\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></value><next><block type=\"variables_set\"><field name=\"VAR\">removeParentBtn</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Control_createButton\"><value name=\"content\"><shadow type=\"text\"><field name=\"TEXT\">Remove Parent</field></shadow></value></block></value><next><block type=\"variables_set\"><field name=\"VAR\">removeChildBtn</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"Control_createButton\"><value name=\"content\"><shadow type=\"text\"><field name=\"TEXT\">Remove Child</field></shadow></value></block></value><next><block type=\"variables_set\"><field name=\"VAR\">parent</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"variables_set\"><field name=\"VAR\">child</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"Styling_setFlexShorthand\"><field name=\"flexShorthand\">FlexShorthand.Auto</field><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><next><block type=\"Styling_setBackgroundColor\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value><value name=\"color\"><block type=\"CssValues_createColor\"><mutation xmlns=\"http://www.w3.org/1999/xhtml\" _expanded=\"0\" _input_init=\"false\"></mutation><value name=\"r\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">148</field></shadow></value><value name=\"g\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">0</field></shadow></value><value name=\"b\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">211</field></shadow></value></block></value><next><block type=\"Styling_setHeight\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value><value name=\"height\"><block type=\"CssValues_createLength\"><field name=\"unit\">CssLengthUnit.PX</field><value name=\"value\"><shadow type=\"math_number\"><field name=\"NUM\">70</field></shadow></value></block></value><next><block type=\"Styling_setWidth\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value><value name=\"width\"><block type=\"CssValues_createLength\"><field name=\"unit\">CssLengthUnit.PX</field><value name=\"value\"><shadow type=\"math_number\"><field name=\"NUM\">500</field></shadow></value></block></value><next><block type=\"Styling_setBackgroundColor\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">child</field></block></value><value name=\"color\"><block type=\"CssValues_createColor\"><mutation xmlns=\"http://www.w3.org/1999/xhtml\" _expanded=\"0\" _input_init=\"false\"></mutation><value name=\"r\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">255</field></shadow></value><value name=\"g\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">165</field></shadow></value><value name=\"b\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">0</field></shadow></value></block></value><next><block type=\"Styling_setHeight\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">child</field></block></value><value name=\"height\"><block type=\"CssValues_createLength\"><field name=\"unit\">CssLengthUnit.PX</field><value name=\"value\"><shadow type=\"math_number\"><field name=\"NUM\">40</field></shadow></value></block></value><next><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">removeParentBtn</field></block></value><next><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">removeChildBtn</field></block></value><next><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">child</field></block></value><next><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value><next><block type=\"ScreenItem_ScreenItem_onClick\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">removeParentBtn</field></block></value><statement name=\"HANDLER\"><block type=\"controls_if\"><value name=\"IF0\"><shadow type=\"logic_boolean\"><field name=\"BOOL\">TRUE</field></shadow><block type=\"ScreenItem_ScreenItem_hasParent\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value></block></value><statement name=\"DO0\"><block type=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">parent</field></block></value></block></statement></block></statement><next><block type=\"ScreenItem_ScreenItem_onClick\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">removeChildBtn</field></block></value><statement name=\"HANDLER\"><block type=\"controls_if\"><value name=\"IF0\"><shadow type=\"logic_boolean\"><field name=\"BOOL\">TRUE</field></shadow><block type=\"ScreenItem_ScreenItem_hasParent\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">child</field></block></value></block></value><statement name=\"DO0\"><block type=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">child</field></block></value></block></statement></block></statement></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></next></block></statement></block></xml>"}
The original output:
When clicks “Remove Child” button, the child (orange box) will be removed.
When clicks “Remove Parent” button, the parent (purple box) and the child (orange box) which within the parent will be removed.
