作者: Joseph A. Ruff , Robert G. Johnston , Daniel Clifford , Dylan B. Ashe
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摘要: The program code for control objects in a graphical user interface is organized multi-level hierarchial structure. At one level of the structure, each different type defines class objects. definition includes most, if not all, functionality associated with that class. In addition, overall structure object, such as relative positions elements which make up object. actual appearance these defined by selectable software resides at lower hierarchy. Using this approach, only instance and object required, resulting smaller memory requirements code.