Class PicturePanel

Method Details

• reset

  public void reset()

  Clears the panel, discarding any existing images.

• bringToTop

  public void bringToTop(Picture picture)

  Move the given picture to the top of the Z order. Adds it, even it if it doesn't exist. Also puts the URL in the url text of the status bar.

  Parameters:

  picture - The picture being brought forward.

• find

  public Picture find(String url)

  Find a picture with the given URL in the panel. This should really only be used to discover if the picture is still visible. There could be more than one picture with the given URL because it may be partially obscured by another picture, in which case the pieces are each given their own picture object, but all point at the same URL and Image.

  Parameters:

  url - The url to locate.

  Returns:

  The first picture encountered in the panel, or null if the picture was not found.

• draw

  protected void draw(Picture picture, boolean add)

  Draw an image on screen.

  Parameters:

  picture - The picture to draw.

  add - If true, the picture is added to the history.

• update

  public void update(Graphics graphics)

  Updates this component.

  Overrides:

  update in class JComponent

  Parameters:

  graphics - The graphics context in which to update the component.

• adjustClipForInsets

  public void adjustClipForInsets(Graphics graphics)

  Adjust the graphics clip region to account for insets.

  Parameters:

  graphics - The graphics object to set the clip region for.

• paint

  public void paint(Graphics graphics)

  Paints this component. Runs through the list of tiles and for every one that intersects the clip region performs a drawImage().

  Overrides:

  paint in class JComponent

  Parameters:

  graphics - The graphics context used to paint with.

• getPreferredSize

  public Dimension getPreferredSize()

  Get the preferred size of the component.

  Overrides:

  getPreferredSize in class JComponent

  Returns:

  The dimension of this component.

• setPreferredSize

  public void setPreferredSize(Dimension dimension)

  Sets the preferred size of this component.

  Overrides:

  setPreferredSize in class JComponent

  Parameters:

  dimension - The new value to use for getPreferredSize() until recalculated.

• calculatePreferredSize

  protected Dimension calculatePreferredSize()

  Compute the preferred size of the component. Computes the minimum bounding rectangle covering all the pictures in the panel. It then does some funky stuff to handle embedding in the view port of a scroll pane, basically asking up the ancestor heirarchy what size is available, and filling it.

  Returns:

  The optimal dimension for this component.

• mouseClicked

  public void mouseClicked(MouseEvent event)

  Invoked when the mouse button has been clicked (pressed and released) on a component. Not used.

  Specified by:

  mouseClicked in interface MouseListener

  Parameters:

  event - The object providing details of the mouse event.

• mouseReleased

  public void mouseReleased(MouseEvent event)

  Invoked when a mouse button has been released on a component. Not used.

  Specified by:

  mouseReleased in interface MouseListener

  Parameters:

  event - The object providing details of the mouse event.

• mouseEntered

  public void mouseEntered(MouseEvent event)

  Invoked when the mouse enters a component. Not used.

  Specified by:

  mouseEntered in interface MouseListener

  Parameters:

  event - The object providing details of the mouse event.

• mouseExited

  public void mouseExited(MouseEvent event)

  Invoked when the mouse exits a component. Not used.

  Specified by:

  mouseExited in interface MouseListener

  Parameters:

  event - The object providing details of the mouse event.

• mousePressed

  public void mousePressed(MouseEvent event)

  Handle left click on a picture by bringing it to the top.

  Specified by:

  mousePressed in interface MouseListener

  Parameters:

  event - The object providing details of the mouse event.

• getPreferredScrollableViewportSize

  public Dimension getPreferredScrollableViewportSize()

  Returns the preferred size of the viewport for a view component. For example the preferredSize of a JList component is the size required to accommodate all of the cells in its list however the value of preferredScrollableViewportSize is the size required for JList.getVisibleRowCount() rows. A component without any properties that would effect the viewport size should just return getPreferredSize() here.

  Specified by:

  getPreferredScrollableViewportSize in interface Scrollable

  Returns:

  The preferredSize of a JViewport whose view is this Scrollable.

  See Also:

  • JComponent.getPreferredSize()

• getScrollableUnitIncrement

  public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction)

  Components that display logical rows or columns should compute the scroll increment that will completely expose one new row or column, depending on the value of orientation. Ideally, components should handle a partially exposed row or column by returning the distance required to completely expose the item.

  Scrolling containers, like JScrollPane, will use this method each time the user requests a unit scroll.

  Specified by:

  getScrollableUnitIncrement in interface Scrollable

  Parameters:

  visibleRect - The view area visible within the viewport

  orientation - Either SwingConstants.VERTICAL or SwingConstants.HORIZONTAL.

  direction - Less than zero to scroll up/left, greater than zero for down/right.

  Returns:

  The "unit" increment for scrolling in the specified direction. This value should always be positive.

• getScrollableBlockIncrement

  public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction)

  Components that display logical rows or columns should compute the scroll increment that will completely expose one block of rows or columns, depending on the value of orientation.

  Scrolling containers, like JScrollPane, will use this method each time the user requests a block scroll.

  Specified by:

  getScrollableBlockIncrement in interface Scrollable

  Parameters:

  visibleRect - The view area visible within the viewport

  orientation - Either SwingConstants.VERTICAL or SwingConstants.HORIZONTAL.

  direction - Less than zero to scroll up/left, greater than zero for down/right.

  Returns:

  The "block" increment for scrolling in the specified direction. This value should always be positive.

• getScrollableTracksViewportWidth

  public boolean getScrollableTracksViewportWidth()

  Return true if a viewport should always force the width of this Scrollable to match the width of the viewport. For example a normal text view that supported line wrapping would return true here, since it would be undesirable for wrapped lines to disappear beyond the right edge of the viewport. Note that returning true for a Scrollable whose ancestor is a JScrollPane effectively disables horizontal scrolling.

  Scrolling containers, like JViewport, will use this method each time they are validated.

  Specified by:

  getScrollableTracksViewportWidth in interface Scrollable

  Returns:

  true if a viewport should force the Scrollables width to match its own.

• getScrollableTracksViewportHeight

  public boolean getScrollableTracksViewportHeight()

  Return true if a viewport should always force the height of this Scrollable to match the height of the viewport. For example a columnar text view that flowed text in left to right columns could effectively disable vertical scrolling by returning true here.

  Scrolling containers, like JViewport, will use this method each time they are validated.

  Specified by:

  getScrollableTracksViewportHeight in interface Scrollable

  Returns:

  true if a viewport should force the Scrollables height to match its own.

• componentResized

  public void componentResized(ComponentEvent event)

  Invoked when the container's size changes. Un-caches the preferred size.

  Specified by:

  componentResized in interface ComponentListener

  Parameters:

  event - The resize event.

• componentMoved

  public void componentMoved(ComponentEvent event)

  Invoked when the component's position changes. Not used.

  Specified by:

  componentMoved in interface ComponentListener

  Parameters:

  event - The component event.

• componentShown

  public void componentShown(ComponentEvent event)

  Invoked when the component has been made visible. Not used.

  Specified by:

  componentShown in interface ComponentListener

  Parameters:

  event - The component event.

• componentHidden

  public void componentHidden(ComponentEvent event)

  Invoked when the component has been made invisible. Not used.

  Specified by:

  componentHidden in interface ComponentListener

  Parameters:

  event - The component event.

• hierarchyChanged

  public void hierarchyChanged(HierarchyEvent event)

  Handles this components ancestor being added to a container. Registers this component as a listener for size changes on the ancestor so that we may un-cache the prefereed size and force a recalculation.

  Specified by:

  hierarchyChanged in interface HierarchyListener

  Parameters:

  event - The heirarchy event.