Tim McKenna Seneca@York Layout Mangers in Java Tim McKenna Seneca@York.

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Presentation transcript:

Tim McKenna Seneca@York Layout Mangers in Java Tim McKenna Seneca@York

Layout Managers A container (JPanel) has a layout manager. A layout manager is an object that manages the size and location of the components inside a container.

Layout Managers A top-level container (JFrame) has a "content pane" which can be set to a container (JPanel). This container can contain other containers. Containers can be associated with different layout managers.

Containment Hierarchy a logical hierarchy of containers nest containers inside other containers JPanel (inside JPanel …) inside JFrame advantages a more organized, cleaner GUI layout new components can be added to one container without affecting the other containers programming technique: use of panels inside panels, each with different layouts

Use of Panels Components are grouped into different containers, i.e. JPanels Each container uses its own layout manager to position components. Another container uses its layout manager to position the panels.

Three Common Layout Managers java.awt.FlowLayout java.awt.BorderLayout java.awt.GridLayout

FlowLayout Manager default for panels and applets locations: from left to right, from top to bottom alignment and spacing Example: FlowLayoutManager.java Exercise: Resize the window and see how the components flow.

BorderLayout Manager default for JFrame window objects locations marked by 5 areas: NORTH, SOUTH, EAST, WEST, CENTER each area can contain only ONE object, usually a JPanel object sizing of the areas: NORTH, SOUTH: horizontal expansion EAST, WEST: vertical expansion CENTER: flows Example: BorderLayoutManager.java

GridLayout Manager locations: a grid of rows and columns size of the components: equal size Example: GridLayoutManager.java Example: LayoutManagers.java

Graphics Programming in Java drawing methods(API): java.awt.Graphics java.awt.Graphics2D (Java 2) Colors: java.awt.Color Fonts: java.awt.Font

Graphics Programming in Java Java’s coordinate system: - upper-left corner of a GUI component: (0,0) - pixel coordinates A Graphics object manages a graphics context for drawing

Displaying Methods for the AWT Component Class the paint () method the repaint () method => update () method: the background is erased => paint () method programming: override the paint () method Example: MouseDemo.java