ParagraphView (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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javax.swing.text.html
Class ParagraphView

java.lang.Object
  javax.swing.text.View
      javax.swing.text.CompositeView
          javax.swing.text.BoxView
              javax.swing.text.FlowView
                  javax.swing.text.ParagraphView
                      javax.swing.text.html.ParagraphView

All Implemented Interfaces:: SwingConstants, TabExpander

public class ParagraphView
extends ParagraphView
extends ParagraphView

Displays the a paragraph, and uses css attributes for its configuration.

Nested classes/interfaces inherited from class javax.swing.text.FlowView
`FlowView.FlowStrategy`

Fields inherited from class javax.swing.text.ParagraphView
`firstLineIndent`

Fields inherited from class javax.swing.text.FlowView
`layoutPool, layoutSpan, strategy`

Fields inherited from class javax.swing.text.View
`BadBreakWeight, ExcellentBreakWeight, ForcedBreakWeight, GoodBreakWeight, X_AXIS, Y_AXIS`

Fields inherited from interface javax.swing.SwingConstants
`BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST`

Constructor Summary
`ParagraphView(Element elem)` Constructs a ParagraphView for the given element.

Method Summary
`protected SizeRequirements`	`calculateMinorAxisRequirements(int axis, SizeRequirements r)` Calculate the needs for the paragraph along the minor axis.
`AttributeSet`	`getAttributes()` Fetches the attributes to use when rendering.
`float`	`getMaximumSpan(int axis)` Determines the maximum span for this view along an axis.
`float`	`getMinimumSpan(int axis)` Determines the minimum span for this view along an axis.
`float`	`getPreferredSpan(int axis)` Determines the preferred span for this view.
`protected StyleSheet`	`getStyleSheet()`
`boolean`	`isVisible()` Indicates whether or not this view should be displayed.
`void`	`paint(Graphics g, Shape a)` Renders using the given rendering surface and area on that surface.
`void`	`setParent(View parent)` Establishes the parent view for this view.
`protected void`	`setPropertiesFromAttributes()` Sets up the paragraph from css attributes instead of the values found in StyleConstants (i.e.

Methods inherited from class javax.swing.text.ParagraphView
`adjustRow, breakView, changedUpdate, createRow, findOffsetToCharactersInString, flipEastAndWestAtEnds, getAlignment, getBreakWeight, getClosestPositionTo, getFlowSpan, getFlowStart, getLayoutView, getLayoutViewCount, getNextNorthSouthVisualPositionFrom, getPartialSize, getTabBase, getTabSet, nextTabStop, setFirstLineIndent, setJustification, setLineSpacing`

Methods inherited from class javax.swing.text.FlowView
`getFlowAxis, getViewIndexAtPosition, insertUpdate, layout, loadChildren, removeUpdate`

Methods inherited from class javax.swing.text.BoxView
`baselineLayout, baselineRequirements, calculateMajorAxisRequirements, childAllocation, forwardUpdate, getAxis, getChildAllocation, getHeight, getOffset, getResizeWeight, getSpan, getViewAtPoint, getWidth, isAfter, isAllocationValid, isBefore, isLayoutValid, layoutChanged, layoutMajorAxis, layoutMinorAxis, modelToView, paintChild, preferenceChanged, replace, setAxis, setSize, viewToModel`

Methods inherited from class javax.swing.text.CompositeView
`getBottomInset, getInsideAllocation, getLeftInset, getNextEastWestVisualPositionFrom, getNextVisualPositionFrom, getRightInset, getTopInset, getView, getViewAtPosition, getViewCount, getViewIndex, modelToView, setInsets, setParagraphInsets`

Methods inherited from class javax.swing.text.View
`append, breakView, createFragment, forwardUpdateToView, getBreakWeight, getContainer, getDocument, getElement, getEndOffset, getGraphics, getParent, getStartOffset, getToolTipText, getViewFactory, getViewIndex, insert, modelToView, remove, removeAll, updateChildren, updateLayout, viewToModel`

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

Constructor Detail

ParagraphView

public ParagraphView(Element elem)

Constructs a ParagraphView for the given element.

Parameters:: elem - the element that this view is responsible for

Method Detail

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 FlowView

Parameters:: parent - the new parent, or null if the view is being removed from a parent it was previously added to

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

setPropertiesFromAttributes

protected void setPropertiesFromAttributes()

Sets up the paragraph from css attributes instead of the values found in StyleConstants (i.e. which are used by the superclass). Since

Overrides:: setPropertiesFromAttributes in class ParagraphView

getStyleSheet

protected StyleSheet getStyleSheet()

calculateMinorAxisRequirements

protected SizeRequirements calculateMinorAxisRequirements(int axis,
                                                          SizeRequirements r)

Calculate the needs for the paragraph along the minor axis. This implemented to use the requirements of the superclass, modified slightly to set a minimum span allowed. Typical html rendering doesn't let the view size shrink smaller than the length of the longest word.

Overrides:: calculateMinorAxisRequirements in class FlowView

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

isVisible

public boolean isVisible()

Indicates whether or not this view should be displayed. If none of the children wish to be displayed and the only visible child is the break that ends the paragraph, the paragraph will not be considered visible. Otherwise, it will be considered visible and return true.

Overrides:: isVisible in class View

Returns:: true if the paragraph should be displayed

paint

public void paint(Graphics g,
                  Shape a)

Renders using the given rendering surface and area on that surface. This is implemented to delgate to the superclass after stashing the base coordinate for tab calculations.

Overrides:: paint in class ParagraphView

Parameters:: g - the rendering surface to use; a - the allocated region to render into
See Also:: View.paint(java.awt.Graphics, java.awt.Shape)

getPreferredSpan

public float getPreferredSpan(int axis)

Determines the preferred span for this view. Returns 0 if the view is not visible, otherwise it calls the superclass method to get the preferred span. 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; 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
See Also:: BoxView.getPreferredSpan(int)

getMinimumSpan

public float getMinimumSpan(int axis)

Determines the minimum span for this view along an axis. Returns 0 if the view is not visible, otherwise it calls the superclass method to get the minimum span.

Overrides:: getMinimumSpan in class BoxView

Parameters:: axis - may be either View.X_AXIS or View.Y_AXIS
Returns:: the minimum span the view can be rendered into
See Also:: BoxView.getMinimumSpan(int)

getMaximumSpan

public float getMaximumSpan(int axis)

Determines the maximum span for this view along an axis. Returns 0 if the view is not visible, otherwise it calls the superclass method ot get the maximum span.

Overrides:: getMaximumSpan in class BoxView

Parameters:: axis - may be either View.X_AXIS or View.Y_AXIS
Returns:: the maximum span the view can be rendered into
See Also:: BoxView.getMaximumSpan(int)