Labels:book | earth | mountain | poster | reckoner | sky | windowpane OCR: Chapter Views and Controls IH9 classinit: ( --) Sets action handlers to null aud selects scrollbar type control Class Hscroll is set up as subelass of Vscroll, and overrides classinit: to set the ivar horiz? to true It takes no other specia action display disable: Sets entire control to 255 hiliting (disabled). enable: Sets entire control to enabled hiliting execution exec: (part# Called from the event handling code when there is mouse -down in the given part of the scroll bar Executes the corresponding action nandler Error messages None Scroller Scroller is a view which has support for a vertical and horizontal scroll bar along the right hand and bottom edge respectively We implement with three child views: mainView, which is the display area and the two scroll bars themselves. These chil ...
