Name
qblockedtrace — connect widget and Tcl variable
Syntax
qblockedtrace [widget] variable
Description
The qblockedtrace command assigns a trace variable to a current widget. A trace variable will at all times reflect the state or contents of the widget to which it is assigned. Writing to the variable will update the widget accordingly.
Assigning a value to a trace variable created with qblockedtrace will not result in the widget's callback function being called. To achieve this use qtrace
See qtrace for a further description on how variable tracing works.
Arguments
widget
The widget to which the variable will be connected. If this argument is omitted the current widget will be used.
variable
The name of the traced variable. The variable should be global or exist in a namespace. When referring to a namespace variable the namespace name should be part of the argument, like "MyNamespace::my_variable".