/*
* @(#)HRuleView.java 1.27 00/02/02
*
* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
package javax.swing.text.html;
import java.awt.*;
import javax.swing.BorderFactory;
import javax.swing.border.*;
import javax.swing.event.DocumentEvent;
import javax.swing.text.*;
import java.util.Enumeration;
import java.lang.Integer;
/**
* A view implementation to display an html horizontal
* rule.
*
* @author Timothy Prinzing
* @author Sara Swanson
* @version 1.27 02/02/00
*/
class HRuleView extends View {
/**
* Creates a new view that represents an <hr> element.
*
* @param elem the element to create a view for
*/
public HRuleView(Element elem) {
super(elem);
setPropertiesFromAttributes();
}
/**
* Update any cached values that come from attributes.
*/
protected void setPropertiesFromAttributes() {
StyleSheet sheet = ((HTMLDocument)getDocument()).getStyleSheet();
AttributeSet eAttr = getElement().getAttributes();
attr = sheet.getViewAttributes(this);
alignment = StyleConstants.ALIGN_LEFT;
size = 0;
noshade = null;
widthValue = null;
// Get the width/height
Enumeration attributes = attr.getAttributeNames();
while (attributes.hasMoreElements()) {
Object key = attributes.nextElement();
}
if (attr != null) {
alignment = StyleConstants.getAlignment(attr);
noshade = (String)eAttr.getAttribute("noshade");
Object value = attr.getAttribute("size");
if (value != null && (value instanceof String))
size = Integer.parseInt((String)value);
value = attr.getAttribute(CSS.Attribute.WIDTH);
if (value != null && (value instanceof CSS.LengthValue)) {
widthValue = (CSS.LengthValue)value;
}
topMargin = getLength(CSS.Attribute.MARGIN_TOP, attr);
bottomMargin = getLength(CSS.Attribute.MARGIN_BOTTOM, attr);
leftMargin = getLength(CSS.Attribute.MARGIN_LEFT, attr);
rightMargin = getLength(CSS.Attribute.MARGIN_RIGHT, attr);
}
else {
topMargin = bottomMargin = leftMargin = rightMargin = 0;
}
if (bevel == null) {
bevel = BorderFactory.createLoweredBevelBorder();
}
}
// This will be removed and centralized at some point, need to unify this
// and avoid private classes.
private float getLength(CSS.Attribute key, AttributeSet a) {
CSS.LengthValue lv = (CSS.LengthValue) a.getAttribute(key);
float len = (lv != null) ? lv.getValue() : 0;
return len;
}
// --- View methods ---------------------------------------------
/**
* Paints the view.
*
* @param g the graphics context
* @param a the allocation region for the view
* @see View#paint
*/
public void paint(Graphics g, Shape a) {
Rectangle alloc = a.getBounds();
int x = 0;
int y = alloc.y + SPACE_ABOVE + (int)topMargin;
int width = alloc.width - (int)(leftMargin + rightMargin);
if (widthValue != null) {
width = (int)widthValue.getValue((float)width);
}
int height = alloc.height - (SPACE_ABOVE + SPACE_BELOW +
(int)topMargin + (int)bottomMargin);
if (size > 0)
height = size;
// Align the rule horizontally.
switch (alignment) {
case StyleConstants.ALIGN_CENTER:
x = alloc.x + (alloc.width / 2) - (width / 2);
break;
case StyleConstants.ALIGN_RIGHT:
x = alloc.x + alloc.width - width - (int)rightMargin;
break;
case StyleConstants.ALIGN_LEFT:
default:
x = alloc.x + (int)leftMargin;
break;
}
// Paint either a shaded rule or a solid line.
if (noshade == HTML.NULL_ATTRIBUTE_VALUE)
g.fillRect(x, y, width, height);
else
bevel.paintBorder(getContainer(), g, x, y, width, height);
}
/**
* Calculates the desired shape of the rule... this is
* basically the preferred size of the border.
*
* @param axis may be either X_AXIS or Y_AXIS
* @return the desired span
* @see View#getPreferredSpan
*/
public float getPreferredSpan(int axis) {
Insets i = bevel.getBorderInsets(getContainer());
switch (axis) {
case View.X_AXIS:
return i.left + i.right;
case View.Y_AXIS:
if (size > 0) {
return size + SPACE_ABOVE + SPACE_BELOW + topMargin +
bottomMargin;
} else {
if (noshade == HTML.NULL_ATTRIBUTE_VALUE) {
return 1 + SPACE_ABOVE + SPACE_BELOW + topMargin +
bottomMargin;
} else {
return i.top + i.bottom + SPACE_ABOVE + SPACE_BELOW +
topMargin + bottomMargin;
}
}
default:
throw new IllegalArgumentException("Invalid axis: " + axis);
}
}
/**
* Gets the resize weight for the axis.
* The rule is: rigid vertically and flexible horizontally.
*
* @param axis may be either X_AXIS or Y_AXIS
* @return the weight
*/
public int getResizeWeight(int axis) {
if (axis == View.X_AXIS) {
return 1;
} else if (axis == View.Y_AXIS) {
return 0;
} else {
return 0;
}
}
/**
* Determines how attractive a break opportunity in
* this view is. This is implemented to request a forced break.
*
* @param axis may be either View.X_AXIS or View.Y_AXIS
* @param pos the potential location of the start of the
* broken view (greater than or equal to zero).
* This may be useful for calculating tab
* positions.
* @param len specifies the relative length from <em>pos</em>
* where a potential break is desired. The value must be greater
* than or equal to zero.
* @return the weight, which should be a value between
* ForcedBreakWeight and BadBreakWeight.
*/
public int getBreakWeight(int axis, float pos, float len) {
if (axis == X_AXIS) {
return ForcedBreakWeight;
}
return BadBreakWeight;
}
public View breakView(int axis, int offset, float pos, float len) {
return null;
}
/**
* Provides a mapping from the document model coordinate space
* to the coordinate space of the view mapped to it.
*
* @param pos the position to convert
* @param a the allocated region to render into
* @return the bounding box of the given position
* @exception BadLocationException if the given position does not
* represent a valid location in the associated document
* @see View#modelToView
*/
public Shape modelToView(int pos, Shape a, Position.Bias b) throws BadLocationException {
int p0 = getStartOffset();
int p1 = getEndOffset();
if ((pos >= p0) && (pos <= p1)) {
Rectangle r = a.getBounds();
if (pos == p1) {
r.x += r.width;
}
r.width = 0;
return r;
}
return null;
}
/**
* Provides a mapping from the view coordinate space to the logical
* coordinate space of the model.
*
* @param x the X coordinate
* @param y the Y coordinate
* @param a the allocated region to render into
* @return the location within the model that best represents the
* given point of view
* @see View#viewToModel
*/
public int viewToModel(float x, float y, Shape a, Position.Bias[] bias) {
Rectangle alloc = (Rectangle) a;
if (x < alloc.x + (alloc.width / 2)) {
bias[0] = Position.Bias.Forward;
return getStartOffset();
}
bias[0] = Position.Bias.Backward;
return getEndOffset();
}
/**
* Fetches the attributes to use when rendering. This is
* implemented to multiplex the attributes specified in the
* model with a StyleSheet.
*/
public AttributeSet getAttributes() {
return attr;
}
public void changedUpdate(DocumentEvent changes, Shape a, ViewFactory f) {
super.changedUpdate(changes, a, f);
int pos = changes.getOffset();
if (pos <= getStartOffset() && (pos + changes.getLength()) >=
getEndOffset()) {
setPropertiesFromAttributes();
}
}
// --- variables ------------------------------------------------
private Border bevel;
private float topMargin;
private float bottomMargin;
private float leftMargin;
private float rightMargin;
private int alignment = StyleConstants.ALIGN_LEFT;
private String noshade = null;
private int size = 0;
private CSS.LengthValue widthValue;
private static final int SPACE_ABOVE = 3;
private static final int SPACE_BELOW = 3;
/** View Attributes. */
private AttributeSet attr;
}