Module java.desktop

Class BlockView

All Implemented Interfaces:
SwingConstants
Direct Known Subclasses:
ListView

public class BlockView
extends BoxView
A view implementation to display a block (as a box) with CSS specifications.
  • Constructor Details

    • BlockView

      public BlockView​(Element elem, int axis)
      Creates a new view that represents an html box. This can be used for a number of elements.
      Parameters:
      elem - the element to create a view for
      axis - either View.X_AXIS or View.Y_AXIS
  • Method Details

    • setParent

      public void setParent​(View parent)
      Establishes the parent view for this view. This is guaranteed to be called before any other methods if the parent view is functioning properly.

      This is implemented to forward to the superclass as well as call the setPropertiesFromAttributes() method to set the paragraph properties from the css attributes. The call is made at this time to ensure the ability to resolve upward through the parents view attributes.

      Overrides:
      setParent in class CompositeView
      Parameters:
      parent - the new parent, or null if the view is being removed from a parent it was previously added to
    • calculateMajorAxisRequirements

      protected SizeRequirements calculateMajorAxisRequirements​(int axis, SizeRequirements r)
      Calculate the requirements of the block along the major axis (i.e. the axis along with it tiles). This is implemented to provide the superclass behavior and then adjust it if the CSS width or height attribute is specified and applicable to the axis.
      Overrides:
      calculateMajorAxisRequirements in class BoxView
      Parameters:
      axis - the axis being studied
      r - the SizeRequirements object; if null one will be created
      Returns:
      the newly initialized SizeRequirements object
      See Also:
      SizeRequirements
    • calculateMinorAxisRequirements

      protected SizeRequirements calculateMinorAxisRequirements​(int axis, SizeRequirements r)
      Calculate the requirements of the block along the minor axis (i.e. the axis orthogonal to the axis along with it tiles). This is implemented to provide the superclass behavior and then adjust it if the CSS width or height attribute is specified and applicable to the axis.
      Overrides:
      calculateMinorAxisRequirements in class BoxView
      Parameters:
      axis - the axis being studied
      r - the SizeRequirements object; if null one will be created
      Returns:
      the newly initialized SizeRequirements object
      See Also:
      SizeRequirements
    • layoutMinorAxis

      protected void layoutMinorAxis​(int targetSpan, int axis, int[] offsets, int[] spans)
      Performs layout for the minor axis of the box (i.e. the axis orthogonal to the axis that it represents). The results of the layout (the offset and span for each children) are placed in the given arrays which represent the allocations to the children along the minor axis.
      Overrides:
      layoutMinorAxis in class BoxView
      Parameters:
      targetSpan - the total span given to the view, which would be used to layout the children.
      axis - the axis being layed out
      offsets - the offsets from the origin of the view for each of the child views; this is a return value and is filled in by the implementation of this method
      spans - the span of each child view; this is a return value and is filled in by the implementation of this method
    • paint

      public void paint​(Graphics g, Shape allocation)
      Renders using the given rendering surface and area on that surface. This is implemented to delegate to the css box painter to paint the border and background prior to the interior.
      Overrides:
      paint in class BoxView
      Parameters:
      g - the rendering surface to use
      allocation - the allocated region to render into
      See Also:
      View.paint(java.awt.Graphics, java.awt.Shape)
    • getAttributes

      public AttributeSet getAttributes()
      Fetches the attributes to use when rendering. This is implemented to multiplex the attributes specified in the model with a StyleSheet.
      Overrides:
      getAttributes in class View
      Returns:
      the attributes to use when rendering
    • getResizeWeight

      public int getResizeWeight​(int axis)
      Gets the resize weight.
      Overrides:
      getResizeWeight in class BoxView
      Parameters:
      axis - may be either X_AXIS or Y_AXIS
      Returns:
      the weight
      Throws:
      IllegalArgumentException - for an invalid axis
    • getAlignment

      public float getAlignment​(int axis)
      Gets the alignment.
      Overrides:
      getAlignment in class BoxView
      Parameters:
      axis - may be either X_AXIS or Y_AXIS
      Returns:
      the alignment
    • getPreferredSpan

      public float getPreferredSpan​(int axis)
      Determines the preferred span for this view along an axis.
      Overrides:
      getPreferredSpan in class BoxView
      Parameters:
      axis - may be either View.X_AXIS or View.Y_AXIS
      Returns:
      the span the view would like to be rendered into >= 0; typically the view is told to render into the span that is returned, although there is no guarantee; the parent may choose to resize or break the view
      Throws:
      IllegalArgumentException - for an invalid axis type
    • getMinimumSpan

      public float getMinimumSpan​(int axis)
      Determines the minimum span for this view along an axis.
      Overrides:
      getMinimumSpan in class BoxView
      Parameters:
      axis - may be either View.X_AXIS or View.Y_AXIS
      Returns:
      the span the view would like to be rendered into >= 0; typically the view is told to render into the span that is returned, although there is no guarantee; the parent may choose to resize or break the view
      Throws:
      IllegalArgumentException - for an invalid axis type
      See Also:
      View.getPreferredSpan(int)
    • getMaximumSpan

      public float getMaximumSpan​(int axis)
      Determines the maximum span for this view along an axis.
      Overrides:
      getMaximumSpan in class BoxView
      Parameters:
      axis - may be either View.X_AXIS or View.Y_AXIS
      Returns:
      the span the view would like to be rendered into >= 0; typically the view is told to render into the span that is returned, although there is no guarantee; the parent may choose to resize or break the view
      Throws:
      IllegalArgumentException - for an invalid axis type
      See Also:
      View.getPreferredSpan(int)
    • setPropertiesFromAttributes

      protected void setPropertiesFromAttributes()
      Update any cached values that come from attributes.
    • getStyleSheet

      protected StyleSheet getStyleSheet()
      Convenient method to get the StyleSheet.
      Returns:
      the StyleSheet