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GUI Components
An Introduction


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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What is a GUI Component?
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  • To a User:
    • A View (in the M-V-C)
  • To a Developer:
    • A Model
    • A Controller
Abstract Components
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  • Model:
    • N/A
  • View:
    • Colors, fonts, ...
  • Controller:
    • hasFocus, isEnabled, ...
Buttons
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  • Model:
    • Labels, icons
  • View:
    • images/button_windows.gif
    • images/button_motif.gif
    • images/button_java.gif
  • Controller:
    • MouseDown, MouseUp
    • MouseOver, MouseOut, KeyPressed
Checkboxes/Radiobuttons
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  • Model:
    • Labels, icons, isSelected
  • View:
    • images/radiobutton_windows.gif
    • images/radiobutton_motif.gif
    • images/radiobutton_java.gif
  • Controller:
    • MouseClick
Listboxes/Comboboxes
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  • Model:
    • Alternatives, selectedItems
  • View:
    • images/combobox_windows.gif
    • images/combobox_motif.gif
    • images/combobox_java.gif
  • Controller:
    • MouseClick, KeyPressed
Sliders
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  • Model:
    • lowerBound, upperBound, value
  • View:
    • images/slider_windows.gif
    • images/slider_motif.gif
    • images/slider_java.gif
  • Controller:
    • MouseDrag
Scrollbars
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  • Model:
    • Same as for sliders
  • View:
    • images/scrollbar_windows.gif
    • images/scrollbar_motif.gif
    • images/scrollbar_java.gif
  • Controller:
    • MouseDrag, MouseClick
Textfields/TextAreas
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  • Model:
    • See the discussion of the M-V-C
  • View:
    • See the discussion of the M-V-C
  • Controller:
    • See the discussion of the M-V-C
There's Always More to Learn
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