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Operators and Keywords

Function List:

C++ API

: waitfor (h)
: waitfor (h, prop)
: waitfor (h, prop, value)
: waitfor (…, "timeout", timeout)

Suspend the execution of the current program until a condition is satisfied on the graphics handle h.

While the program is suspended graphics events are still processed normally, allowing callbacks to modify the state of graphics objects. This function is reentrant and can be called from a callback, while another waitfor call is pending at the top-level.

In the first form, program execution is suspended until the graphics object h is destroyed. If the graphics handle is invalid, the function returns immediately.

In the second form, execution is suspended until the graphics object is destroyed or the property named prop is modified. If the graphics handle is invalid or the property does not exist, the function returns immediately.

In the third form, execution is suspended until the graphics object is destroyed or the property named prop is set to value. The function isequal is used to compare property values. If the graphics handle is invalid, the property does not exist or the property is already set to value, the function returns immediately.

An optional timeout can be specified using the property timeout. This timeout value is the number of seconds to wait for the condition to be true. timeout must be at least 1. If a smaller value is specified, a warning is issued and a value of 1 is used instead. If the timeout value is not an integer, it is truncated towards 0.

To define a condition on a property named timeout, use the string \timeout instead.

In all cases, typing CTRL-C stops program execution immediately.

See also: waitforbuttonpress, isequal.

Package: octave