Java layoutmanager

Java layoutmanager

• 1.
  JAVA Layout Manager Prepared by Miss.Arati A. Gadgil
• 2.
  LayoutManagers The LayoutManagers areused to arrange components in a particular manner.  LayoutManager is an interface that is implemented by all the classes of layout managers. A layout manager is an object that controls the size and the position of components in a container. Every Container object has a LayoutManager object that controls its layout. 2
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  There are followingclasses that represents the layout managers: java.awt.BorderLayout java.awt.FlowLayout java.awt.GridLayout java.awt.CardLayout java.awt.GridBagLayout javax.swing.BoxLayout javax.swing.GroupLayout javax.swing.ScrollPaneLayout javax.swing.SpringLayout etc. 3
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  BorderLayout: The BorderLayout isused to arrange the components in five regions: north, south, east, west and center. Each region (area) may contain one component only. It is the default layout of frame or window. The BorderLayout provides five constants for each region: public static final int NORTH public static final int SOUTH public static final int EAST public static final int WEST public static final int CENTER 4
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  Example of BorderLayoutclass: Constructors of BorderLayout class: BorderLayout(): creates a border layout but with no gaps between the components. BorderLayout(int hgap, int vgap): creates a border layout with the given horizontal and vertical gaps between the components. 5
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  GridLayout The GridLayout isused to arrange the components in rectangular grid. One component is displayed in each rectangle. Constructors of GridLayout class: 1.GridLayout(): creates a grid layout with one column per component in a row. 2.GridLayout(int rows, int columns): creates a grid layout with the given rows and columns but no gaps between the components. 3.GridLayout(int rows, int columns, int hgap, int vgap): creates a grid layout with the given rows and columns alongwith given horizontal and vertical gaps. 6
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  GridLayout 7
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  FlowLayout The FlowLayout isused to arrange the components in a line, one after another (in a flow). It is the default layout of applet or panel. Fields of FlowLayout class: 1.public static final int LEFT 2.public static final int RIGHT 3.public static final int CENTER 4.public static final int LEADING 5.public static final int TRAILING 8
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  Constructors of FlowLayoutclass: 1.FlowLayout(): creates a flow layout with centered alignment and a default 5 unit horizontal and vertical gap. 2.FlowLayout(int align): creates a flow layout with the given alignment and a default 5 unit horizontal and vertical gap. 3.FlowLayout(int align, int hgap, int vgap): creates a flow layout with the given alignment and the given horizontal and vertical gap. 9
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  FlowLayout 10
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  11 CardLayout class The CardLayoutclass manages the components in such a manner that only one component is visible at a time. It treats each component as a card that is why it is known as CardLayout. Constructors CardLayout(): creates a card layout with zero horizontal and vertical gap. CardLayout(int hgap, int vgap): creates a card layout with the given horizontal and vertical gap.
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  12 methods public void next(Containerparent): is used to flip to the next card of the given container. public void previous(Container parent): is used to flip to the previous card of the given container. public void first(Container parent): is used to flip to the first card of the given container. public void last(Container parent): is used to flip to the last card of the given container. public void show(Container parent, String name): is used to flip to the specified card with the given name.
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  13 BoxLayout class Fields ofBoxLayout class: public static final int X_AXIS public static final int Y_AXIS public static final int LINE_AXIS public static final int PAGE_AXIS Constructor of BoxLayout class: BoxLayout(Container c, int axis): creates a box layout that arranges the components with the given axis.
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  Thank You 14