page-width

Arguments: stream &optional (stream-units-p t)

Returns the page-width attribute of the stream argument. stream should be a cg-stream. The value may be set at creation time by passing the page-width initarg, or any time later by calling (setf page-width) or set-page-size.

If stream-units-p is true, the value is in stream units, otherwise it is in space-widths (the width of the space character in the default font). See cg-coordinates.htm.

The value is always an integer, rounded if necessary when stream-units-p is nil. page-width is the width of what might be called the canvas of the window, only a portion of which may be visible. If you add horizontal scrollbars to a window whose page-width is greater than its interior-width, the range of the scrollbars is the page-width and you can scroll the visible portion of the window left and right over that page-width.

The function page-width always returns a number, which is either the value returned by explicit-page-width if it returns a number, or else the number returned by default-page-width. The function (setf page-width) may be passed either an explicit page-width number or else nil to make page-width default according to the default-page-width method for the window.

Note that the page-width property uses explicit-page-width as its reader function. This means that a page-width property in the IDE's inspector will be nil unless a page-width has been explicitly assigned. The writer function is still (setf page-width), and so a page-width property may be changed in the inspector either to an explicit number or to nil.

If stream is an instance of a drawable control, this function returns (or sets with setf) the width of the entire "canvas" that may be scrolled onto the drawable. Typically used only when the horizontal scrollbar is enabled.

See also page-height and set-page-size.

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This page was not revised from the 10.0 page.
Created 2019.8.20.