Using AWT Controls, Layout Managers, and Menus

1
Using AWT Controls, Layout Managers, and Menus

• Chapter 22

2
AWT Controls

• Labels
• Buttons
• Check boxes
• Choice Lists
• Lists
• Scroll bars
• Text Fields
• Text Boxes

• All awt controls need to be added to the
  component
• add(variableName)

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Labels

• Contructors
• Label( )
• Label (String str)
• Label (String str, int how)
• Methods
• void setText(String str)
• String getText( )
• Constants
• Label.LEFT, Label.RIGHT, Label.CENTER

4
Buttons

• Contructors
• Button( )
• Button (String str)
• Methods
• void setLabel(String str)
• String getLabel( )

5
Check Boxes

• Contructors
• Checkbox( )
• Checkbox(String str)
• Checkbox(String str, boolean on)
• Checkbox(String str, boolean on, CheckBoxGroup
  cbGroup)
• Checkbox(String, CheckboxGroup cbGroup, boolean
  on)

• Methods
• void setState(boolean on)
• String getLabel(String str)
• boolean getState( )
• String getLabel( )
• Constructor
• CheckboxGroup( )

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Choice Controls(Drop-down Menus)

• Contructors
• Choice( )
• Methods
• void addItem(String str)
• void add(String str)
• String getSelectedItem( )
• int getSelectedIndex( )
• int getItemCount( )
• void select(int index)
• void select(String name)

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Choice Controls(Drop-down Menus)

• Contructors
• Choice( )
• Methods
• void addItem(String str)
• void add(String str)
• String getSelectedItem( )
• int getSelectedIndex( )
• int getItemCount( )
• void select(int index)
• void select(String name)

8
Lists

• Contructors
• List ( )
• List (int numRows)
• List (int numRows, boolean multipleSelect)
• Methods
• void add(String str)
• void add(String str, int index)
• String getSelectedItem( ) / String
  getSelectedItems( )
• int getSelectedIndex( ) / int
  getSelectedIndexes( )
• int getItemCount( )
• void select(int index)

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TextFields

• Contructors
• TextField ( )
• TextField (int numChars)
• TextField(String str)
• TextField(String str, int numChars)
• Methods
• void setText(String str)
• String getText( )
• String getSelectedText( )
• void select (int startIndex, int endIndex)
• void setEchoChar(char ch)

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TextArea

• Contructors
• TextArea ( )
• TextArea (int numLines, int numChars)
• TextArea(String str)
• TextArea(String str, int numLines, int numChars,
  int sBars)
• Methods
• void setText(String str)
• String getText( )
• String getSelectedText( )

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Panels

• Container for components
• A window
• Without title bar, menu bar, or border
• add(variableNameOfComponent)
• place panels on Layout Managers

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Layout Managers

• FlowLayout
• BorderLayout
• GridLayout
• CardLayout

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FlowLayout

• FlowLayout
• Similar to word processor
• Components added left to right
• Constructors
• FlowLayout( ) // default centered
• FlowLayout(int how)
• FlowLayout (int how, int horz, int vert)
• Constants
• FlowLayout.LEFT, FlowLayout.CENTER,
  FlowLayout.RIGHT

14
BorderLayout

• BorderLayout
• Five Major Areas
• Top, Left, Center, Right, Bottom
• Constructors
• BorderLayout( )
• BorderLayout(int horz, int vert)
• Constants
• BorderLayout.CENTER, BorderLayout.EAST,
  BorderLayout.NORTH, BorderLayout.South,
  BorderLayout.WEST

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GridLayout

• GridLayout
• Table
• Constructors
• GridLayout( )
• GridLayout(int numRows, int numColumns)
• GridLayout(int numRows, int numColumns, int horz,
  int vert)