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## org.biojava.bio.gui.sequence
Class PaddingRenderer

    java.lang.Object
      org.biojava.utils.AbstractChangeable
          org.biojava.bio.gui.sequence.SequenceRendererWrapper
              org.biojava.bio.gui.sequence.PaddingRenderer

All Implemented Interfaces:
  Serializable, SequenceRenderer, Changeable

    public class PaddingRenderer

extends SequenceRendererWrapper

A renderer that adds padding before and after a delegate renderer.

Since:
  1.2
Author:
  Matthew Pocock
See Also:
  Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.biojava.bio.gui.sequence.SequenceRenderer
`SequenceRenderer.RendererForwarder`

Field Summary
`static ChangeType` | `PADDING` Event type for when the size of the padding changes.

Fields inherited from class org.biojava.bio.gui.sequence.SequenceRendererWrapper
`RENDERER`

Constructor Summary
`PaddingRenderer()` Build a new PaddingRenderer with zero padding.
`PaddingRenderer(SequenceRenderer renderer, double padding)` Build a new PaddingRenderer that wraps `renderer` and has padding depth `padding`.

Method Summary
`protected ChangeSupport` | `getChangeSupport(ChangeType ct)` Called to retrieve the ChangeSupport for this object.
`double` | `getDepth(SequenceRenderContext src)` Retrieve the depth of this renderer when rendering src.
`double` | `getMinimumLeader(SequenceRenderContext src)` Retrieve the minimum leading distance for this renderer when rendering src.
`double` | `getMinimumTrailer(SequenceRenderContext src)` Retrieve the minimum trailing distance for this renderer when rendering src.
`double` | `getPadding()` Retrieve the current padding.
`protected boolean` | `hasListeners()` Discover if we have any listeners registered.
`void` | `paint(Graphics2D g, SequenceRenderContext src)` Render a portion (possibly all) of the information for src to g, displaying all of the data that would fall within seqBox.
`SequenceViewerEvent` | `processMouseEvent(SequenceRenderContext src, MouseEvent me, List path)` Produce a SequenceViewerEvent in response to a mouse gesture.
`void` | `setPadding(double padding)` Set the padding.
`String` | `toString()`

Methods inherited from class org.biojava.bio.gui.sequence.SequenceRendererWrapper
`getRenderer, setRenderer`

Methods inherited from class org.biojava.utils.AbstractChangeable
`addChangeListener, addChangeListener, generateChangeSupport, hasListeners, isUnchanging, removeChangeListener, removeChangeListener`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### PADDING

    public static ChangeType PADDING

  Event type for when the size of the padding changes.

Constructor Detail

### PaddingRenderer

    public PaddingRenderer()

  Build a new PaddingRenderer with zero padding.

  This will cause a rendering effect equivalent to missing out the padding renderer all together.

### PaddingRenderer

    public PaddingRenderer(SequenceRenderer renderer,
                           double padding)

  Build a new PaddingRenderer that wraps `renderer` and has padding depth `padding`.

  Parameters:
    `renderer` - the SequenceRenderer that will actually do the rendering
    `padding` - the number of pixels to leave both before and after rendering the child renderer

Method Detail

### hasListeners

    protected boolean hasListeners()

  Description copied from class: `AbstractChangeable`
  Discover if we have any listeners registered.

  Overrides:
    `hasListeners` in class `AbstractChangeable`
  Returns:
    true if there is at least one listener

### getChangeSupport

    protected ChangeSupport getChangeSupport(ChangeType ct)

  Description copied from class: `AbstractChangeable`
  Called to retrieve the ChangeSupport for this object.

  Your implementation of this method should have the following structure: ``

       ChangeSupport cs = super.getChangeSupport(ct);

       if(someForwarder == null && ct.isMatching(SomeInterface.SomeChangeType)) {
         someForwarder = new ChangeForwarder(...

         this.stateVariable.addChangeListener(someForwarder, VariableInterface.AChange);
       }

       return cs;

  It is usual for the forwarding listeners (someForwarder in this example) to be transient and lazily instantiated. Be sure to register & unregister the forwarder in the code that does the ChangeEvent handling in setter methods.

  Overrides:
    `getChangeSupport` in class `SequenceRendererWrapper`

### setPadding

    public void setPadding(double padding)
                    throws ChangeVetoException

  Set the padding.

  The padding will be added to the area before and after that required to render the delegate renderer.

  Parameters:
    `padding` - the new padding size
  Throws:
    `ChangeVetoException` - if padding is negative or if any listener objected to the change

### getPadding

    public double getPadding()

  Retrieve the current padding.

  Returns:
    the current padding

### getDepth

    public double getDepth(SequenceRenderContext src)

  Description copied from interface: `SequenceRenderer`
  Retrieve the depth of this renderer when rendering src.

  The depth may vary between sequence panels - for example based upon sequence length. Each line of information in the SequenceRendererContext only renders a region of the sequence. The depth for one complete line may be different from that for another due to the sequence having more or less information in that region to show. For example, a feature renderer implementation may chose to collapse down to a depth of zero pixels if there are no features to render within a region.

  Specified by:
    `getDepth` in interface `SequenceRenderer`
  Overrides:
    `getDepth` in class `SequenceRendererWrapper`
  Parameters:
    `src` - the SequenceRenderContext to return info for
  Returns:
    the depth of the renderer for that sequence panel

### getMinimumLeader

    public double getMinimumLeader(SequenceRenderContext src)

  Description copied from interface: `SequenceRenderer`
  Retrieve the minimum leading distance for this renderer when rendering src.

  The leading distance may vary between sequence panels - for example based upon sequence length.

  Specified by:
    `getMinimumLeader` in interface `SequenceRenderer`
  Overrides:
    `getMinimumLeader` in class `SequenceRendererWrapper`
  Parameters:
    `src` - the SequenceRenderContext to return info for
  Returns:
    the leading distance of the renderer for that sequence panel

### getMinimumTrailer

    public double getMinimumTrailer(SequenceRenderContext src)

  Description copied from interface: `SequenceRenderer`
  Retrieve the minimum trailing distance for this renderer when rendering src.

  The trailing distance may vary between sequence panels - for example based upon sequence length.

  Specified by:
    `getMinimumTrailer` in interface `SequenceRenderer`
  Overrides:
    `getMinimumTrailer` in class `SequenceRendererWrapper`
  Parameters:
    `src` - the SequenceRenderContext to return info for
  Returns:
    the trailing distance of the renderer for that sequence panel

### paint

    public void paint(Graphics2D g,
                      SequenceRenderContext src)

  Description copied from interface: `SequenceRenderer`
  Render a portion (possibly all) of the information for src to g, displaying all of the data that would fall within seqBox.

  Specified by:
    `paint` in interface `SequenceRenderer`
  Overrides:
    `paint` in class `SequenceRendererWrapper`
  Parameters:
    `g` - the Graphics2D to render to
    `src` - the SequenceRenderContext that encapsulates the information to render

### processMouseEvent

    public SequenceViewerEvent processMouseEvent(SequenceRenderContext src,
                                                 MouseEvent me,
                                                 List path)

  Description copied from interface: `SequenceRenderer`
  Produce a SequenceViewerEvent in response to a mouse gesture.

  A SequenceRenderer that performs any form of coordinate remapping should ensure that it appropriately transforms the mouse event. However, in the SequenceViewerEvent returned, the MouseEvent should be in untransformed coordinates.

  The SequenceRenderer implementation should append itself to the path list before constructing the SequenceViewerEvent.

  Specified by:
    `processMouseEvent` in interface `SequenceRenderer`
  Overrides:
    `processMouseEvent` in class `SequenceRendererWrapper`
  Parameters:
    `src` - the SequenceRenderContext currently in scope
    `me` - a MouseEvent that caused this request
    `path` - the List of SequenceRenderer instances passed through so far
  Returns:
    a SequenceViewerEvent encapsulating the mouse gesture

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

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