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package javax.swing.text.html;
import java.util.Enumeration;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.text.*;
A view implementation to display an unwrapped
preformatted line.
This subclasses ParagraphView, but this really only contains one
Row of text.
Author: Timothy Prinzing
/**
* A view implementation to display an unwrapped
* preformatted line.<p>
* This subclasses ParagraphView, but this really only contains one
* Row of text.
*
* @author Timothy Prinzing
*/
class LineView extends ParagraphView {
Last place painted at. /** Last place painted at. */
int tabBase;
Creates a LineView object.
Params: - elem – the element to wrap in a view
/**
* Creates a LineView object.
*
* @param elem the element to wrap in a view
*/
public LineView(Element elem) {
super(elem);
}
Preformatted lines are not suppressed if they
have only whitespace, so they are always visible.
/**
* Preformatted lines are not suppressed if they
* have only whitespace, so they are always visible.
*/
public boolean isVisible() {
return true;
}
Determines the minimum span for this view along an
axis. The preformatted line should refuse to be
sized less than the preferred size.
Params: - axis – may be either
View.X_AXIS or
View.Y_AXIS
See Also: Returns: the minimum span the view can be rendered into
/**
* Determines the minimum span for this view along an
* axis. The preformatted line should refuse to be
* sized less than the preferred size.
*
* @param axis may be either <code>View.X_AXIS</code> or
* <code>View.Y_AXIS</code>
* @return the minimum span the view can be rendered into
* @see View#getPreferredSpan
*/
public float getMinimumSpan(int axis) {
return getPreferredSpan(axis);
}
Gets the resize weight for the specified axis.
Params: - axis – may be either X_AXIS or Y_AXIS
Returns: the weight
/**
* Gets the resize weight for the specified axis.
*
* @param axis may be either X_AXIS or Y_AXIS
* @return the weight
*/
public int getResizeWeight(int axis) {
switch (axis) {
case View.X_AXIS:
return 1;
case View.Y_AXIS:
return 0;
default:
throw new IllegalArgumentException("Invalid axis: " + axis);
}
}
Gets the alignment for an axis.
Params: - axis – may be either X_AXIS or Y_AXIS
Returns: the alignment
/**
* Gets the alignment for an axis.
*
* @param axis may be either X_AXIS or Y_AXIS
* @return the alignment
*/
public float getAlignment(int axis) {
if (axis == View.X_AXIS) {
return 0;
}
return super.getAlignment(axis);
}
Lays out the children. If the layout span has changed,
the rows are rebuilt. The superclass functionality
is called after checking and possibly rebuilding the
rows. If the height has changed, the
preferenceChanged method is called
on the parent since the vertical preference is
rigid.
Params: - width – the width to lay out against >= 0. This is
the width inside of the inset area.
- height – the height to lay out against >= 0 (not used
by paragraph, but used by the superclass). This
is the height inside of the inset area.
/**
* Lays out the children. If the layout span has changed,
* the rows are rebuilt. The superclass functionality
* is called after checking and possibly rebuilding the
* rows. If the height has changed, the
* <code>preferenceChanged</code> method is called
* on the parent since the vertical preference is
* rigid.
*
* @param width the width to lay out against >= 0. This is
* the width inside of the inset area.
* @param height the height to lay out against >= 0 (not used
* by paragraph, but used by the superclass). This
* is the height inside of the inset area.
*/
protected void layout(int width, int height) {
super.layout(Integer.MAX_VALUE - 1, height);
}
Returns the next tab stop position given a reference position.
This view implements the tab coordinate system, and calls
getTabbedSpan on the logical children in the process
of layout to determine the desired span of the children. The
logical children can delegate their tab expansion upward to
the paragraph which knows how to expand tabs.
LabelView is an example of a view that delegates
its tab expansion needs upward to the paragraph.
This is implemented to try and locate a TabSet
in the paragraph element's attribute set. If one can be
found, its settings will be used, otherwise a default expansion
will be provided. The base location for for tab expansion
is the left inset from the paragraphs most recent allocation
(which is what the layout of the children is based upon).
Params: - x – the X reference position
- tabOffset – the position within the text stream
that the tab occurred at >= 0.
See Also: Returns: the trailing end of the tab expansion >= 0
/**
* Returns the next tab stop position given a reference position.
* This view implements the tab coordinate system, and calls
* <code>getTabbedSpan</code> on the logical children in the process
* of layout to determine the desired span of the children. The
* logical children can delegate their tab expansion upward to
* the paragraph which knows how to expand tabs.
* <code>LabelView</code> is an example of a view that delegates
* its tab expansion needs upward to the paragraph.
* <p>
* This is implemented to try and locate a <code>TabSet</code>
* in the paragraph element's attribute set. If one can be
* found, its settings will be used, otherwise a default expansion
* will be provided. The base location for for tab expansion
* is the left inset from the paragraphs most recent allocation
* (which is what the layout of the children is based upon).
*
* @param x the X reference position
* @param tabOffset the position within the text stream
* that the tab occurred at >= 0.
* @return the trailing end of the tab expansion >= 0
* @see TabSet
* @see TabStop
* @see LabelView
*/
public float nextTabStop(float x, int tabOffset) {
// If the text isn't left justified, offset by 10 pixels!
if (getTabSet() == null &&
StyleConstants.getAlignment(getAttributes()) ==
StyleConstants.ALIGN_LEFT) {
return getPreTab(x, tabOffset);
}
return super.nextTabStop(x, tabOffset);
}
Returns the location for the tab.
/**
* Returns the location for the tab.
*/
protected float getPreTab(float x, int tabOffset) {
Document d = getDocument();
View v = getViewAtPosition(tabOffset, null);
if ((d instanceof StyledDocument) && v != null) {
// Assume f is fixed point.
Font f = ((StyledDocument)d).getFont(v.getAttributes());
Container c = getContainer();
FontMetrics fm = (c != null) ? c.getFontMetrics(f) :
Toolkit.getDefaultToolkit().getFontMetrics(f);
int width = getCharactersPerTab() * fm.charWidth('W');
int tb = (int)getTabBase();
return (float)((((int)x - tb) / width + 1) * width + tb);
}
return 10.0f + x;
}
Returns: number of characters per tab, 8.
/**
* @return number of characters per tab, 8.
*/
protected int getCharactersPerTab() {
return 8;
}
}