Module jEdit
Package org.gjt.sp.jedit.gui

Class ExtendedGridLayout

java.lang.Object
org.gjt.sp.jedit.gui.ExtendedGridLayout
All Implemented Interfaces:
LayoutManager, LayoutManager2
public class ExtendedGridLayout extends Object implements LayoutManager2

A layout manager that places components in a rectangular grid with variable cell sizes that supports colspans and rowspans.

The container is divided into rectangles, and each component is placed in a rectangular space defined by its colspan and rowspan. Each row is as large as the largest component in that row, and each column is as wide as the widest component in that column.

This behavior is similar to java.awt.GridLayout but it supports different row heights and column widths for each row/column.

For example, the following is a Dialog that lays out ten buttons exactly the same as in the example of the JavaDoc of java.awt.GridBagLayout with the difference of vertical and horizontal gaps that can be configured: 


    1:import java.awt.Button;
    2:import java.awt.Dimension;
    3:
    4:import javax.swing.JDialog;
    5:
    6:import org.gjt.sp.jedit.gui.ExtendedGridLayout;
    7:import org.gjt.sp.jedit.gui.ExtendedGridLayoutConstraints;
    8:
    9:import static org.gjt.sp.jedit.gui.ExtendedGridLayoutConstraints.REMAINDER;
   10:
   11:public class ExampleDialog extends JDialog {
   12:    public ExampleDialog() {
   13:        super(null,"Example Dialog",true);
   14:        setLayout(new ExtendedGridLayout(5,5,new Insets(5,5,5,5)));
   15:
   16:        add(makeButton("Button1"));
   17:        add(makeButton("Button2"));
   18:        add(makeButton("Button3"));
   19:        add(makeButton("Button4"));
   20:        Button button = makeButton("Button5");
   21:        add(button,new ExtendedGridLayoutConstraints(1,REMAINDER,1,button));
   22:        button = makeButton("Button6");
   23:        add(button,new ExtendedGridLayoutConstraints(2,3,1,button));
   24:        button = makeButton("Button7");
   25:        add(button,new ExtendedGridLayoutConstraints(2,button));
   26:        button = makeButton("Button8");
   27:        add(button,new ExtendedGridLayoutConstraints(3,1,2,button));
   28:        button = makeButton("Button9");
   29:        add(button,new ExtendedGridLayoutConstraints(3,3,1,button));
   30:        button = makeButton("Button10");
   31:        add(button,new ExtendedGridLayoutConstraints(4,REMAINDER,1,button));
   32:
   33:        pack();
   34:        setLocationRelativeTo(null);
   35:        setVisible(true);
   36:    }
   37:
   38:    private Button makeButton(String name) {
   39:        Button button = new Button(name);
   40:        button.setMaximumSize(new Dimension(Integer.MAX_VALUE,Integer.MAX_VALUE));
   41:        return button;
   42:    }
   43:}
If you use REMAINDER as colspan or rowspan then a component takes up the remaining space in that column or row. Any additional components in a row are ignored and not displayed. Additional components in a column are moved rightside. If a rowspan hits a colspan, the colspan ends and the rowspan takes precedence.

Components for which isVisible() == false are ignored. Because of this, components can be replaced "in-place" by adding two components next to each other, with different isVisible() values, and toggling the setVisible() values of both when we wish to swap the currently visible component with the one that is hidden.

If you want to reserve free space in a row inbetween components, add a javax.swing.Box.Filler to the layout if the free space is in the middle of a row, or just don't add components if the free space should be at the end of a row.

If a row is taller, or a column is wider than the maximumSize of a component, the component is resized to its maximum size and aligned according to its alignmentX and alignmentY values.

One instance of this class can be used to layout multiple containers at the same time.

Version:
1.0
Author:
Björn "Vampire" Kautler
See Also:

  • Constructor Details

    • ExtendedGridLayout

      public ExtendedGridLayout(int hgap, int vgap, Insets distanceToBorders)
      Creates an extended grid layout manager with the specified horizontal and vertical gap, and the specified distance to the borders of the parent container.
      Parameters:
      hgap - The horizontal space between two columns (>=0)
      vgap - The vertical space between two rows (>=0)
      distanceToBorders - The distances to the borders of the parent container
      Throws:
      IllegalArgumentException - if hgap < 0
      IllegalArgumentException - if vgap < 0

    • ExtendedGridLayout

      public ExtendedGridLayout()
      Creates an extended grid layout manager with zero horizontal and vertical gap, and zero distance to the borders of the parent container.

  • Method Details

    • addLayoutComponent

      public void addLayoutComponent(String name, Component component)
      If the layout manager uses a per-component string, adds the component component to the layout, associating it with the string specified by name.
      Specified by:
      addLayoutComponent in interface LayoutManager
      Parameters:
      name - The string to be associated with the component. Has to be null, so that default constraints are used.
      component - The component to be added
      Throws:
      IllegalArgumentException - if name is not null
      See Also:

    • addLayoutComponent

      public void addLayoutComponent(Component component, Object constraints)
      Adds the specified component to the layout, using the specified constraints object.
      Specified by:
      addLayoutComponent in interface LayoutManager2
      Parameters:
      component - The component to be added
      constraints - Where/how the component is added to the layout.
      Throws:
      IllegalArgumentException - if constraints is not an ExtendedGridLayoutConstraints object
      IllegalArgumentException - if constraints is a placeholder
      IllegalArgumentException - if constraints is not the right one for the component
      See Also:

    • removeLayoutComponent

      public void removeLayoutComponent(Component component)
      Removes the specified component from the layout.
      Specified by:
      removeLayoutComponent in interface LayoutManager
      Parameters:
      component - The component to be removed

    • getLayoutAlignmentX

      public float getLayoutAlignmentX(Container container)
      Returns the alignment along the X axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.
      Specified by:
      getLayoutAlignmentX in interface LayoutManager2
      Parameters:
      container - The container for which the alignment should be returned
      Returns:
      java.awt.Component.CENTER_ALIGNMENT

    • getLayoutAlignmentY

      public float getLayoutAlignmentY(Container container)
      Returns the alignment along the Y axis. This specifies how the component would like to be aligned relative to other components. The value should be a number between 0 and 1 where 0 represents alignment along the origin, 1 is aligned the furthest away from the origin, 0.5 is centered, etc.
      Specified by:
      getLayoutAlignmentY in interface LayoutManager2
      Parameters:
      container - The container for which the alignment should be returned
      Returns:
      java.awt.Component.CENTER_ALIGNMENT

    • minimumLayoutSize

      public Dimension minimumLayoutSize(Container parent)
      Calculates the minimum size dimensions for the specified container, given the components it contains.
      Specified by:
      minimumLayoutSize in interface LayoutManager
      Parameters:
      parent - The component to be laid out
      Returns:
      The minimum size for the container
      See Also:

    • preferredLayoutSize

      public Dimension preferredLayoutSize(Container parent)
      Calculates the preferred size dimensions for the specified container, given the components it contains.
      Specified by:
      preferredLayoutSize in interface LayoutManager
      Parameters:
      parent - The container to be laid out
      Returns:
      The preferred size for the container
      See Also:

    • maximumLayoutSize

      public Dimension maximumLayoutSize(Container parent)
      Calculates the maximum size dimensions for the specified container, given the components it contains.
      Specified by:
      maximumLayoutSize in interface LayoutManager2
      Parameters:
      parent - The container to be laid out
      Returns:
      The maximum size for the container
      See Also:

    • invalidateLayout

      public void invalidateLayout(Container container)
      Invalidates the layout, indicating that if the layout manager has cached information it should be discarded.
      Specified by:
      invalidateLayout in interface LayoutManager2
      Parameters:
      container - The container for which the cached information should be discarded

    • layoutContainer

      public void layoutContainer(Container parent)
      Lays out the specified container.
      Specified by:
      layoutContainer in interface LayoutManager
      Parameters:
      parent - The container to be laid out

    • toString

      public String toString()
      Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read.
      Overrides:
      toString in class Object
      Returns:
      a string representation of the object.