該文件說明了如何將元素滾動到可見範圍、識別父元素、清除和刪除屏幕項目中的值，以及向屏幕項目添加操作。

將元素滾動到可見區域

屏幕專案滾動到檢視中

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"ScreenItem_ScreenItem_scrollIntoView\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">screenItem</field></block></value></block></xml>"}

此塊用於將指定的佈局滾動到可見區域。

參數： 屏幕專案
輸出： N/A
範例代碼：

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>scrollButton</variable><variable>secondChildLayout</variable><variable>firstChildLayout</variable><variable>screenItem</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=\"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=\"variables_set\"><field name=\"VAR\">scrollButton</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\">Scroll</field></shadow></value></block></value><next><block type=\"ScreenItem_ScreenItem_onClick\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">scrollButton</field></block></value><statement name=\"HANDLER\"><block type=\"ScreenItem_ScreenItem_scrollIntoView\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">secondChildLayout</field></block></value></block></statement><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\">scrollButton</field></block></value><next><block type=\"variables_set\"><field name=\"VAR\">firstChildLayout</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"Styling_setHeight\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">firstChildLayout</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\">1000</field></shadow></value></block></value><next><block type=\"Styling_setBackgroundColor\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">firstChildLayout</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\">255</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=\"variables_set\"><field name=\"VAR\">secondChildLayout</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></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\">firstChildLayout</field></block></value><next><block type=\"Styling_setHeight\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">secondChildLayout</field></block></value><value name=\"height\"><block type=\"CssValues_createLengthPercentage\"><value name=\"value\"><shadow type=\"math_number\"><field name=\"NUM\">100</field></shadow></value></block></value><next><block type=\"Styling_setBackgroundColor\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">secondChildLayout</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\">0</field></shadow></value><value name=\"g\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">255</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=\"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\">secondChildLayout</field></block></value></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>"}

原始輸出：

點擊「滾動」按鈕後：

獲取父元素

螢幕項 獲取父螢幕項

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"ScreenItem_ScreenItem_getParent\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">screenItem</field></block></value></block></xml>"}

此塊用於獲取父螢幕項。

參數： 屏幕專案
輸出： 屏幕專案
範例代碼：

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>removeChildBtn</variable><variable>removeParentBtn</variable><variable>parent</variable><variable>child</variable><variable>screenItem</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\">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\">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\">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\">255</field></shadow></value><value name=\"g\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">255</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\">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\">0</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\">255</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=\"Styling_setWidth\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">child</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\">300</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\">removeChildBtn</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\">removeParentBtn</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\">removeChildBtn</field></block></value><statement name=\"HANDLER\"><block type=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">child</field></block></value></block></statement><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=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"ScreenItem_ScreenItem_getParent\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">child</field></block></value></block></value></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></next></block></statement></block></xml>"}

輸出：

當按鍵「刪除子項」按鈕時，子項（藍色框）將被刪除。

當單擊“刪除父項”按鈕時，父項（黃色框）和父項內的子項（藍色框）將被刪除。

查找父螢幕專案

螢幕項具有父螢幕項

{"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>"}

此塊用於檢查變數是否具有父螢幕項。

參數： 屏幕專案
輸出： 布林值 （True/False）
範例代碼：

這裡是使用一個if條件來刪除屏幕專案。

{"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>"}

原始輸出：

當單擊“刪除子項”按鈕時，子項（橙色框）將被刪除。

當單擊“刪除父項”按鈕時，父項（紫色框）和父項內的子項（橙色框）將被刪除。

取消螢幕項中的所有值

刪除屏幕專案

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">screenItem</field></block></value></block></xml>"}

這個塊用於刪除螢幕中的所有值。

參數： 屏幕專案
輸出： N/A
範例代碼：

按下按鈕后，此處將刪除螢幕項中的所有值。

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"ScreenItem_ScreenItem_onClick\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">button</field></block></value><statement name=\"HANDLER\"><block type=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></statement></block></xml>"}

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>button</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\">button</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 Main Layout</field></shadow></value></block></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\">mainLayout</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=\"ScreenItem_ScreenItem_onClick\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">button</field></block></value><statement name=\"HANDLER\"><block type=\"ScreenItem_ScreenItem_remove\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></statement><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\">button</field></block></value></block></next></block></next></block></next></block></next></block></next></block></next></block></statement></block></xml>"}

原始輸出：

當按鍵「刪除主佈局」 按鈕時，主佈局（橙色區域）將被刪除。

刪除屏幕專案中的值

清除螢幕專案

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"ScreenItem_ScreenItem_getParent\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">screenItem</field></block></value></block></xml>"}

此塊用於清除相關佈局中的所有值。

參數： 屏幕專案
輸出： N/A
範例代碼：

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</variable><variable>removeChildBtn</variable><variable>childLayout</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=\"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\">mainLayout</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\">218</field></shadow></value><value name=\"b\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">185</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 content in child layout</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\">removeChildBtn</field></block></value><next><block type=\"variables_set\"><field name=\"VAR\">childLayout</field><value name=\"VALUE\"><shadow type=\"math_number\"><field name=\"NUM\">0</field></shadow><block type=\"ScreenItem_createLayout\"/></value><next><block type=\"Styling_setBackgroundColor\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">childLayout</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\">0</field></shadow></value><value name=\"g\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">255</field></shadow></value><value name=\"b\"><shadow type=\"math_number_minmax\"><mutation min=\"0\" max=\"255\" label=\"Number\" precision=\"0\"/><field name=\"SLIDER\">191</field></shadow></value></block></value><next><block type=\"Styling_setHeight\"><value name=\"item\"><block type=\"variables_get\"><field name=\"VAR\">childLayout</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\">childLayout</field></block></value><value name=\"item\"><block type=\"Control_createTextBlock\"><mutation xmlns=\"http://www.w3.org/1999/xhtml\" _expanded=\"1\" _input_init=\"true\"></mutation><value name=\"text\"><shadow type=\"text\"><field name=\"TEXT\">Text inside the child layout.</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\">childLayout</field></block></value><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=\"ScreenItem_ScreenItem_clear\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">childLayout</field></block></value></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></statement></block></xml>"}

原始輸出：

當單擊「刪除子佈局中的內容」按鈕時，文本將被刪除。

使用螢幕項添加一些操作

控制點擊

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><block type=\"ScreenItem_ScreenItem_click\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></xml>"}

此塊用於設置變數或佈局的特定對齊方式。

參數： 屏幕專案
輸出： N/A
範例代碼：

{"blocks":"<xml xmlns=\"https://developers.google.com/blockly/xml\"><variables><variable>mainLayout</variable><variable>mainScreen</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=\"Task_runAfter\"><value name=\"ms\"><shadow type=\"math_number\"><field name=\"NUM\">5000</field></shadow></value><value name=\"abortSignal\"><block type=\"Task_createAbortControl\"/></value><statement name=\"HANDLER\"><block type=\"ScreenItem_ScreenItem_click\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value></block></statement><next><block type=\"ScreenItem_ScreenItem_onClick\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><statement name=\"HANDLER\"><block type=\"ScreenItem_Layout_add\"><value name=\"this\"><block type=\"variables_get\"><field name=\"VAR\">mainLayout</field></block></value><value name=\"item\"><block type=\"Control_createTextBlock\"><mutation xmlns=\"http://www.w3.org/1999/xhtml\" _expanded=\"1\" _input_init=\"true\"></mutation><value name=\"text\"><shadow type=\"text\"><field name=\"TEXT\">It clicked main layout after 5 second.</field></shadow></value></block></value></block></statement></block></next></block></next></block></next></block></statement></block></xml>"}

在單擊主佈局之前，輸出：

點擊主佈局后，輸出：