Multiple Canvases:

Without Oracle Developer you can take benefits of the GUI environment through displaying a form module across various canvases and in multiple windows.  This chapter familiarizes you with the window object, the default canvas type and the content canvas.

Windows and Content Canvases

With form Builder you can show an application in multiple windows by using its canvases and display objects windows.

What is a Window?

A window is a container for all visual objects which make up a Form Builder application.  It is same to an empty picture frame. The window manager gives the controls for the window which enable such functionality as scrolling as moving, scrolling, and resizing.  You can minimize a window.

A single form might involve various windows.

What is a Canvas?

A canvas is a surface inside a window container on that you place visual objects like as interface graphics and items.  It is same to the canvas upon that a picture is painted.  To look a canvas and its content at run time you must show it in a window.  A canvas constantly displays in the window to that it is assigned.

Note: Every item in a form must refer to no more than one canvas.  An item displays on the canvas to that it is assigned, by its Canvas property.       Recall that if the Canvas property for an item is left unspecified, in which an item is said to be a Null-canvas item and will not display at runtime.

What is a Viewport?

A viewport is an attribute of a canvas.  It is efficiently the visible portion of, or view against, the canvas.