Understanding AS3 context menus

核心提示：You all should know what is a context menu.A context menu (also called contextual, shortcut, and popup or pop-up menu) is a menu in a graphical user interface (

You all should know what is a context menu.

A context menu (also called contextual, shortcut, and popup or pop-up menu) is a menu in a graphical user interface (GUI) that appears upon user interaction, such as a right mouse click. A context menu offers a limited set of choices that are available in the current state, or context, of the operating system or application (source: Wikipedia).

There are thousands of tutorials about custom context menus, anyway I am publishing this script to make you understand how to create different context menus according to what you are clicking on.

Look… when you right click on the stage, you get a contextual menu to place the circle in the middle of the stage, and when you click on the circle you get a contextual menu to place it randomly around the stage.

Here it is the commented source

package　{
　import　flash.display.Sprite;
　//　classes　to　manage　context　menus
　import　flash.ui.ContextMenu;
　import　flash.ui.ContextMenuItem;
　import　flash.events.ContextMenuEvent;
　public　class　context　extends　Sprite　{
　　//　this　is　the　circle　you　see　on　the　stage
　　public　var　the_sphere:sphere=new　sphere();
　　//　creation　of　two　contextual　menus
　　public　var　place_randomly_menu:ContextMenu=new　ContextMenu;
　　public　var　reset_menu:ContextMenu=new　ContextMenu;
　　//　creation　of　two　contextual　menu　items
　　public　var　place_randomly_item:ContextMenuItem=new　ContextMenuItem("Place　randomly");
　　public　var　reset_item:ContextMenuItem=new　ContextMenuItem("Reset");
　　public　function　context()　{
　　　//　placing　the　circle　on　the　stage
　　　addChild(the_sphere);
　　　//　calling　the　function　to　place　the　sphere　in　the　middle　of　the　stage
　　　//　I　am　passing　a　null　value　because　it's　the　same　function　I　am　using
　　　//　in　the　listener,　and　functions　in　listeners　require　a　parameter
　　　reset_sphere(null);
　　　//　adding　to　the　context　menu　item　a　listener　to　execute　"place_sphere"　function
　　　place_randomly_item.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT,place_sphere);
　　　//　hiding　default　items　in　the　context　menu
　　　place_randomly_menu.hideBuiltInItems();
　　　//　pusing　(in　this　case　placing)　the　menu　item　in　the　context　menu
　　　place_randomly_menu.customItems.push(place_randomly_item);
　　　//　assigning　the　context　menu　to　the　circle
　　　the_sphere.contextMenu=(place_randomly_menu)
　　　//　repeating　the　same　thing　whith　the　other　menu,　the　stage　one
　　　reset_item.addEventListener(ContextMenuEvent.MENU_ITEM_SELECT,reset_sphere);
　　　reset_menu.hideBuiltInItems();
　　　reset_menu.customItems.push(reset_item);
　　　this.contextMenu=reset_menu;
　　}
　　public　function　place_sphere(event:ContextMenuEvent):void　{
　　　the_sphere.x=Math.random()*400+50;
　　　the_sphere.y=Math.random()*300+50;
　　}
　　public　function　reset_sphere(event:ContextMenuEvent):void　{
　　　the_sphere.x=250;
　　　the_sphere.y=200;
　　}
　}
}

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