1 / 10

Layout Mangers in Java

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.

neka
Download Presentation

Layout Mangers in Java

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Layout Mangers in Java Tim McKenna Seneca@York

  2. 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.

  3. 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.

  4. Containment Hierarchy • a logical hierarchy of containers • nest containers inside other containersJPanel (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

  5. 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.

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

  7. FlowLayout Manager • default for panels and applets • multiple components placed from left to right, from top to bottom • alignment and spacing can be adj. • Example: FlowLayoutManager.java • Exercise: Resize the window and see how the components flow.

  8. 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

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

  10. Layout Managers • Flow/Border/Grid Layouts all have limited use. • GridBagLayout is much more flexible and much harder to use. • bobjects package JPanelGrid combines GridLayout ease of use and GridBagLayout power. • see JFrameJPanelGrid.java

More Related