Basic HTML version of Foils prepared Sept 21 1998

Foil 57 New Components: ScrollPanes and PopupMenus

From Java Tutorial 98- 3: Graphics and the Abstract Windowing Toolkit NAVO Tutorial -- Sept 23 1998. by Geoffrey C. Fox, Nancy McCracken
new component classes for Foil 57
1 A ScrollPane provides a scrollable area within an existing window. It is a container which can have one other component added to it. This component may have a larger area that will be visible in the ScrollPane. For example, suppose that you have a Canvas drawing area that is 1000 by 1000 pixels wide. You can define a ScrollPane that will view part of it at one time.
  • Canvas draw = new Canvas();
  • draw.setSize (1000, 1000);
  • ScrollPane drawscroller = new ScrollPane();
  • drawscroller.add (draw);
  • drawscroller.setSize (250, 250);
  • add(drawscroller);
2 A PopupMenu is a sometimes called a context-sensitive menu. On most systems, the right mouse button cause a popup trigger event, and you can create a PopupMenu to appear.
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