TBMANLIB_ListBoxHScroll Package

Author: woeoio. Version: 1.0.0.1

The TBMANLIB_ListBoxHScroll contributed package provides a helper class that adds a functional horizontal scrollbar to a standard VB ListBox control by combining the LB_SETHORIZONTALEXTENT message, Win32 scroll-info APIs, and window subclassing.

Classes

• cListboxHScroll – a helper class that adds a functional horizontal scrollbar to a standard VB ListBox control using GDI text measurement, LB_SETHORIZONTALEXTENT, and window subclassing
  • Show – attaches the horizontal scrollbar to a ListBox control and initialises scroll handling
  • UnShow – removes the window subclass installed by Show

Test cases

The notes and warnings of this section are checked by the test cases in TBMANLIB_ListBoxHScroll-tests.twinproj, a twinBASIC project. It uses TBMANLIB_ListBoxHScroll as a linked package: put the package’s .twinpack in %APPDATA%\twinBASIC\packages, then run the project, and each case prints whether it passes.