Java
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This presentation discusses Java layout managers. It introduces the different types of layout managers provided by Java: FlowLayout, GridLayout, BorderLayout, and CardLayout. It explains how each layout manager positions and sizes components differently. For example, FlowLayout places components in rows from left to right, GridLayout places components in a rigid grid formation, and BorderLayout divides a container into regions and places components within those regions. The presentation also covers how to set a layout manager on a container and provides details on the constructors for each layout manager type.
Java
- 1. PRESENTATION ON LAYOUT MANAGERS
- 2. INTRODUCTION Java uses Layout Managers to define the location and size of Graphical User Interface components. Java technology uses Layout Managers to define the location and size of Graphical User Interface components.. A Layout Manager implements a layout policy that defines constraints between components in a container.
- 3. TYPES OF LAYOUT MANAGER Java technology provides the following Layout Managers, each of which implements the Layout Manager interface: Flow Layout Grid Layout Border Layout CardLayout
- 4. DEFAULT LAYOUT MANAGER The FlowLayout is the default Layout Manager for Panel, and hence the Applet class. The BorderLayout is the default Layout Manager for Window class and its subclasses (Frame and Dialog).
- 5. SETTING LAYOUT MANAGERS The following method defined in the Container class can be used for setting layout managers. void setLayout(LayoutManager mgr);
- 6. FLOWLAYOUT MANAGER FlowLayout places component in rows from left to right. Components towards the end of row are written on next row, if there is not enough space in the current row. The FlowLayout honors the specified size of a component.
- 7. CONTD…. The following constructors of FlowLayout are provided by AWT – FlowLayout(); FlowLayout(int alignment); FlowLayout(int alignment, int hor_gap, int ver_gap);
- 8. CONTD….
- 9. GRIDLAYOUT MANAGER A Grid Layout Manager places the components in a rectangular grid. Each component's position is identified by a column and row. All the cells in the grid have same size and width. Each component is stretched to the cell size. So a Grid Layout ignores the Component's preferred size.
- 10. CONTD…. The GridLayout class provides the following constructors: GridLayout(); GridLayout(int rows, int columns); GridLayout(int rows, int columns, int hor_gap, int ver_gap);
- 11. CONTD….
- 12. BORDERLAYOUT MANAGER A BorderLayout Manager divides the window into five regions - North, East, West, South and Center. A component can be explicitly added to one of the regions using the add() method of the Container class. Any space left over by the component in North, East, South and West is occupied by the component in Center.
- 13. CONTD: The BorderLayout class defines the following constructors : BorderLayout(); BorderLayout(int hor_gap, int ver_gap);
- 14. CONTD…
- 15. CARD LAYOUT The CardLayout class is unique among the other layout managers in that it stores several different layouts. Each layout can be thought of as being on a separate index card in a deck that can be shuffled so that any card is on top at a given time.
- 16. CARD LAYOUT CardLayout provides these two constructors: CardLayout( ) CardLayout(int horz, int vert)
- 17. CONTD…
- 18. THANK YOU