Class GridBagLayout

java.lang.Object
com.codename1.ui.layouts.Layout
com.codename1.ui.layouts.GridBagLayout
public class GridBagLayout extends Layout

Codename One port of the infamous GridBagLayout based on the Apache Harmony code. For new applications we generally recommend a "native" Codename One layout such as com.codename1.ui.table.TableLayout and recommend avoiding this layout. Its here for developers who are accustomed to it and need to port existing code.

Button button;
hi.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;

button = new Button("Button 1");
c.weightx = 0.5;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
hi.addComponent(c, button);

button = new Button("Button 2");
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 1;
c.gridy = 0;
hi.addComponent(c, button);

button = new Button("Button 3");
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 2;
c.gridy = 0;
hi.addComponent(c, button);

button = new Button("Long-Named Button 4");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 40;      //make this component tall
c.weightx = 0.0;
c.gridwidth = 3;
c.gridx = 0;
c.gridy = 1;
hi.addComponent(c, button);

button = new Button("5");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0;       //reset to default
c.weighty = 1.0;   //request any extra vertical space
c.anchor = GridBagConstraints.PAGE_END; //bottom of space
c.insets = new Insets(10,0,0,0);  //top padding
c.gridx = 1;       //aligned with button 2
c.gridwidth = 2;   //2 columns wide
c.gridy = 2;       //third row
hi.addComponent(c, button);

  • Field Details

    • MAXGRIDSIZE

      protected static final int MAXGRIDSIZE
      See Also:

    • MINSIZE

      protected static final int MINSIZE
      See Also:

    • PREFERREDSIZE

      protected static final int PREFERREDSIZE
      See Also:

    • columnWeights

      public double[] columnWeights

    • rowWeights

      public double[] rowWeights

    • columnWidths

      public int[] columnWidths

    • rowHeights

      public int[] rowHeights

    • comptable

      protected Hashtable<Component, GridBagConstraints> comptable

    • defaultConstraints

      protected GridBagConstraints defaultConstraints

    • layoutInfo

      protected com.codename1.ui.layouts.GridBagLayoutInfo layoutInfo

  • Constructor Details

    • GridBagLayout

      public GridBagLayout()

  • Method Details

    • addLayoutComponent

      public void addLayoutComponent(Object constraints, Component comp, Container c)
      Description copied from class: Layout

      Some layouts can optionally track the addition of elements with meta-data that allows the user to "hint" on object positioning.

      Parameters

      • value: optional meta data information, like alignment orientation

      • comp: the added component to the layout

      • c: the parent container

      Overrides:
      addLayoutComponent in class Layout

    • removeLayoutComponent

      public void removeLayoutComponent(Component comp)
      Description copied from class: Layout

      Removes the component from the layout this operation is only useful if the layout maintains references to components within it

      Parameters
      • comp: the removed component from layout
      Overrides:
      removeLayoutComponent in class Layout

    • getComponentConstraint

      public Object getComponentConstraint(Component comp)
      Description copied from class: Layout

      Returns the optional component constraint

      Parameters
      • comp: the component whose constraint should be returned
      Returns

      the optional component constraint

      Overrides:
      getComponentConstraint in class Layout

    • setConstraints

      public void setConstraints(Component comp, GridBagConstraints constraints)

    • invalidateLayout

      public void invalidateLayout(Container target)

    • getPreferredSize

      public Dimension getPreferredSize(Container parent)
      Description copied from class: Layout

      Returns the container preferred size

      Parameters
      • parent: the parent container
      Returns

      the container preferred size

      Specified by:
      getPreferredSize in class Layout

    • layoutContainer

      public void layoutContainer(Container parent)
      Description copied from class: Layout

      Layout the given parent container children

      Parameters
      • parent: the given parent container
      Specified by:
      layoutContainer in class Layout

    • getLayoutDimensions

      public int[][] getLayoutDimensions()

    • getLayoutWeights

      public double[][] getLayoutWeights()

    • arrangeGrid

      protected void arrangeGrid(Container parent)

    • lookupConstraints

      protected GridBagConstraints lookupConstraints(Component comp)

    • adjustForGravity

      protected void adjustForGravity(GridBagConstraints constraints, Rectangle r)