BasicSplitPaneUI.BasicHorizontalLayoutManager (Java SE 25 & JDK 25)
Description: declaration: module: java.desktop, package: javax.swing.plaf.basic, class: BasicSplitPaneUI, class: BasicHorizontalLayoutManager
Keywords: javax.swing.plaf.basic.BasicSplitPaneUI.BasicHorizontalLayoutManager class

# Class BasicSplitPaneUI.BasicHorizontalLayoutManager

java.lang.Object
javax.swing.plaf.basic.BasicSplitPaneUI.BasicHorizontalLayoutManager

All Implemented Interfaces:
  `LayoutManager, LayoutManager2`

Direct Known Subclasses:
  `BasicSplitPaneUI.BasicVerticalLayoutManager`

Enclosing class:
  `BasicSplitPaneUI`

public sealed class BasicSplitPaneUI.BasicHorizontalLayoutManager extends Object implements LayoutManager2 permits BasicSplitPaneUI.BasicVerticalLayoutManager
LayoutManager for JSplitPanes that have an orientation of HORIZONTAL_SPLIT.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected Component[]`
  `components`
  The components.
  `protected int[]`
  `sizes`
  The size of components.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addLayoutComponent(Component comp, Object constraints)`
  Adds the specified component to the layout, using the specified constraint object.
  `void`
  `addLayoutComponent(String place, Component component)`
  Adds the component at place.
  `protected int`
  `getAvailableSize(Dimension containerSize, Insets insets)`
  Returns the available width based on the container size and `Insets`.
  `protected int`
  `getInitialLocation(Insets insets)`
  Returns the left inset, unless the `Insets` are null in which case 0 is returned.
  `float`
  `getLayoutAlignmentX(Container target)`
  Returns the alignment along the x axis.
  `float`
  `getLayoutAlignmentY(Container target)`
  Returns the alignment along the y axis.
  `protected int`
  `getPreferredSizeOfComponent(Component c)`
  Returns the width of the passed in Components preferred size.
  `protected int`
  `getSizeOfComponent(Component c)`
  Returns the width of the passed in component.
  `protected int[]`
  `getSizes()`
  Returns the sizes of the components.
  `void`
  `invalidateLayout(Container c)`
  Does nothing.
  `void`
  `layoutContainer(Container container)`
  Does the actual layout.
  `Dimension`
  `maximumLayoutSize(Container target)`
  Returns the maximum layout size, which is Integer.MAX_VALUE in both directions.
  `Dimension`
  `minimumLayoutSize(Container container)`
  Returns the minimum size needed to contain the children.
  `Dimension`
  `preferredLayoutSize(Container container)`
  Returns the preferred size needed to contain the children.
  `void`
  `removeLayoutComponent(Component component)`
  Removes the specified component from our knowledge.
  `protected void`
  `resetSizeAt(int index)`
  Resets the size of the Component at the passed in location.
  `void`
  `resetToPreferredSizes()`
  Marks the receiver so that the next time this instance is laid out it'll ask for the preferred sizes.
  `protected void`
  `setComponentToSize(Component c, int size, int location, Insets insets, Dimension containerSize)`
  Sets the width of the component `c` to be `size`, placing its x location at `location`, y to the `insets.top` and height to the `containerSize.height` less the top and bottom insets.
  `protected void`
  `setSizes(int[] newSizes)`
  Sets the sizes to `newSizes`.
  `protected void`
  `updateComponents()`
  Determines the components.

  ### Methods declared in class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### sizes

    protected int[] sizes
    The size of components.

  - ### components

    protected Component[] components
    The components.

- ## Method Details

  - ### layoutContainer

    public void layoutContainer(Container container)
    Does the actual layout.
    Specified by:
      `layoutContainer` in interface `LayoutManager`
    Parameters:
      `container` - the container to be laid out

  - ### addLayoutComponent

    public void addLayoutComponent(String place, Component component)
    Adds the component at place. Place must be one of JSplitPane.LEFT, RIGHT, TOP, BOTTOM, or null (for the divider).
    Specified by:
      `addLayoutComponent` in interface `LayoutManager`
    Parameters:
      `place` - the string to be associated with the component
      `component` - the component to be added

  - ### minimumLayoutSize

    public Dimension minimumLayoutSize(Container container)
    Returns the minimum size needed to contain the children. The width is the sum of all the children's min widths and the height is the largest of the children's minimum heights.
    Specified by:
      `minimumLayoutSize` in interface `LayoutManager`
    Parameters:
      `container` - the component to be laid out
    Returns:
      the minimum dimension for the container
    See Also:
      - `LayoutManager.preferredLayoutSize(Container)`

  - ### preferredLayoutSize

    public Dimension preferredLayoutSize(Container container)
    Returns the preferred size needed to contain the children. The width is the sum of all the preferred widths of the children and the height is the largest preferred height of the children.
    Specified by:
      `preferredLayoutSize` in interface `LayoutManager`
    Parameters:
      `container` - the container to be laid out
    Returns:
      the preferred dimension for the container
    See Also:
      - `LayoutManager.minimumLayoutSize(Container)`

  - ### removeLayoutComponent

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

  - ### addLayoutComponent

    public void addLayoutComponent(Component comp, Object constraints)
    Adds the specified component to the layout, using the specified constraint object.
    Specified by:
      `addLayoutComponent` in interface `LayoutManager2`
    Parameters:
      `comp` - the component to be added
      `constraints` - where/how the component is added to the layout.

  - ### getLayoutAlignmentX

    public float getLayoutAlignmentX(Container target)
    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:
      `target` - the target container
    Returns:
      the x-axis alignment preference

  - ### getLayoutAlignmentY

    public float getLayoutAlignmentY(Container target)
    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:
      `target` - the target container
    Returns:
      the y-axis alignment preference

  - ### invalidateLayout

    public void invalidateLayout(Container c)
    Does nothing. If the developer really wants to change the size of one of the views JSplitPane.resetToPreferredSizes should be messaged.
    Specified by:
      `invalidateLayout` in interface `LayoutManager2`
    Parameters:
      `c` - the target container

  - ### maximumLayoutSize

    public Dimension maximumLayoutSize(Container target)
    Returns the maximum layout size, which is Integer.MAX_VALUE in both directions.
    Specified by:
      `maximumLayoutSize` in interface `LayoutManager2`
    Parameters:
      `target` - the target container
    Returns:
      the maximum size of the container
    See Also:
      - `Component.getMaximumSize()`
      - `LayoutManager`

  - ### resetToPreferredSizes

    public void resetToPreferredSizes()
    Marks the receiver so that the next time this instance is laid out it'll ask for the preferred sizes.

  - ### resetSizeAt

    protected void resetSizeAt(int index)
    Resets the size of the Component at the passed in location.
    Parameters:
      `index` - the index of a component

  - ### setSizes

    protected void setSizes(int[] newSizes)
    Sets the sizes to `newSizes`.
    Parameters:
      `newSizes` - the new sizes

  - ### getSizes

    protected int[] getSizes()
    Returns the sizes of the components.
    Returns:
      the sizes of the components

  - ### getPreferredSizeOfComponent

    protected int getPreferredSizeOfComponent(Component c)
    Returns the width of the passed in Components preferred size.
    Parameters:
      `c` - a component
    Returns:
      the preferred width of the component

  - ### getSizeOfComponent

    protected int getSizeOfComponent(Component c)
    Returns the width of the passed in component.
    Parameters:
      `c` - a component
    Returns:
      the width of the component

  - ### getAvailableSize

    protected int getAvailableSize(Dimension containerSize, Insets insets)
    Returns the available width based on the container size and `Insets`.
    Parameters:
      `containerSize` - a container size
      `insets` - an insets
    Returns:
      the available width

  - ### getInitialLocation

    protected int getInitialLocation(Insets insets)
    Returns the left inset, unless the `Insets` are null in which case 0 is returned.
    Parameters:
      `insets` - the insets
    Returns:
      the left inset

  - ### setComponentToSize

    protected void setComponentToSize(Component c, int size, int location, Insets insets, Dimension containerSize)
    Sets the width of the component `c` to be `size`, placing its x location at `location`, y to the `insets.top` and height to the `containerSize.height` less the top and bottom insets.
    Parameters:
      `c` - a component
      `size` - a new width
      `location` - a new X coordinate
      `insets` - an insets
      `containerSize` - a container size

  - ### updateComponents

    protected void updateComponents()
    Determines the components. This should be called whenever a new instance of this is installed into an existing SplitPane.