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HRuleView.java
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1998-06-30
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/*
* @(#)HRuleView.java 1.12 98/03/13
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing.text.html;
import java.awt.*;
import com.sun.java.swing.BorderFactory;
import com.sun.java.swing.border.*;
import com.sun.java.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 1.12 03/13/98
*/
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);
AttributeSet attr = elem.getAttributes();
if (attr != null) {
margin_left = StyleConstants.getLeftIndent(attr);
margin_right = StyleConstants.getRightIndent(attr);
if (margin_left <= 0)
margin_left = 15;
if (margin_right <= 0)
margin_right = 15;
alignment = StyleConstants.getAlignment(attr);
noshade = (String) attr.getAttribute("noshade");
String sizestr = (String)attr.getAttribute("size");
if (sizestr != null)
size = (Integer.valueOf(sizestr)).intValue();
String hrwidthstr = (String)attr.getAttribute("width");
if (hrwidthstr != null)
hrwidth = (Integer.valueOf(hrwidthstr)).intValue();
}
bevel = BorderFactory.createLoweredBevelBorder();
}
// --- 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;
int width = alloc.width - (int)(margin_left + margin_right);
if (hrwidth > 0)
width = hrwidth;
int height = alloc.height;
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 - hrwidth - (int)(margin_right);
break;
case StyleConstants.ALIGN_LEFT:
default:
x = alloc.x + (int)margin_left;
break;
}
// Paint either a shaded rule or a solid line.
if (noshade == Constants.NULL_ATTRIBUTE)
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;
} else {
if (noshade == Constants.NULL_ATTRIBUTE) {
return 1;
} else {
return i.top + i.bottom;
}
}
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;
}
}
/**
* 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) throws BadLocationException {
int p0 = getStartOffset();
int p1 = getEndOffset();
if ((pos >= p0) && (pos < p1)) {
Rectangle r = new Rectangle(a.getBounds());
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) {
Rectangle alloc = a.getBounds();
return getStartOffset();
}
// --- variables ------------------------------------------------
private Border bevel;
private float margin_left = 0;
private float margin_right = 0;
private int alignment = StyleConstants.ALIGN_LEFT;
private String noshade = null;
private int size = 0;
private int hrwidth = 0;
}