/**
* $Id: mxStyleUtils.java,v 1.1 2012/11/15 13:26:39 gaudenz Exp $
* Copyright (c) 2007-2012, JGraph Ltd
*/
package com.mxgraph.util;
import java.util.ArrayList;
import java.util.List;
import com.mxgraph.model.mxIGraphModel;
/**
* Contains various style helper methods for use with mxGraph.
*/
public class mxStyleUtils
{
/**
* Returns the stylename in a style of the form stylename[;key=value] or an
* empty string if the given style does not contain a stylename.
*
* @param style
* String of the form stylename[;key=value].
* @return Returns the stylename from the given formatted string.
*/
public static String getStylename(String style)
{
if (style != null)
{
String[] pairs = style.split(";");
String stylename = pairs[0];
if (stylename.indexOf("=") < 0)
{
return stylename;
}
}
return "";
}
/**
* Returns the stylenames in a style of the form stylename[;key=value] or an
* empty array if the given style does not contain any stylenames.
*
* @param style
* String of the form stylename[;stylename][;key=value].
* @return Returns the stylename from the given formatted string.
*/
public static String[] getStylenames(String style)
{
List<String> result = new ArrayList<String>();
if (style != null)
{
String[] pairs = style.split(";");
for (int i = 0; i < pairs.length; i++)
{
if (pairs[i].indexOf("=") < 0)
{
result.add(pairs[i]);
}
}
}
return result.toArray(new String[result.size()]);
}
/**
* Returns the index of the given stylename in the given style. This returns
* -1 if the given stylename does not occur (as a stylename) in the given
* style, otherwise it returns the index of the first character.
*/
public static int indexOfStylename(String style, String stylename)
{
if (style != null && stylename != null)
{
String[] tokens = style.split(";");
int pos = 0;
for (int i = 0; i < tokens.length; i++)
{
if (tokens[i].equals(stylename))
{
return pos;
}
pos += tokens[i].length() + 1;
}
}
return -1;
}
/**
* Adds the specified stylename to the given style if it does not already
* contain the stylename.
*/
public static String addStylename(String style, String stylename)
{
if (indexOfStylename(style, stylename) < 0)
{
if (style == null)
{
style = "";
}
else if (style.length() > 0
&& style.charAt(style.length() - 1) != ';')
{
style += ';';
}
style += stylename;
}
return style;
}
/**
* Removes all occurrences of the specified stylename in the given style and
* returns the updated style. Trailing semicolons are preserved.
*/
public static String removeStylename(String style, String stylename)
{
StringBuffer buffer = new StringBuffer();
if (style != null)
{
String[] tokens = style.split(";");
for (int i = 0; i < tokens.length; i++)
{
if (!tokens[i].equals(stylename))
{
buffer.append(tokens[i] + ";");
}
}
}
return (buffer.length() > 1) ? buffer.substring(0, buffer.length() - 1)
: buffer.toString();
}
/**
* Removes all stylenames from the given style and returns the updated
* style.
*/
public static String removeAllStylenames(String style)
{
StringBuffer buffer = new StringBuffer();
if (style != null)
{
String[] tokens = style.split(";");
for (int i = 0; i < tokens.length; i++)
{
if (tokens[i].indexOf('=') >= 0)
{
buffer.append(tokens[i] + ";");
}
}
}
return (buffer.length() > 1) ? buffer.substring(0, buffer.length() - 1)
: buffer.toString();
}
/**
* Assigns the value for the given key in the styles of the given cells, or
* removes the key from the styles if the value is null.
*
* @param model
* Model to execute the transaction in.
* @param cells
* Array of cells to be updated.
* @param key
* Key of the style to be changed.
* @param value
* New value for the given key.
*/
public static void setCellStyles(mxIGraphModel model, Object[] cells,
String key, String value)
{
if (cells != null && cells.length > 0)
{
model.beginUpdate();
try
{
for (int i = 0; i < cells.length; i++)
{
if (cells[i] != null)
{
String style = setStyle(model.getStyle(cells[i]), key,
value);
model.setStyle(cells[i], style);
}
}
}
finally
{
model.endUpdate();
}
}
}
/**
* Adds or removes the given key, value pair to the style and returns the
* new style. If value is null or zero length then the key is removed from
* the style.
*
* @param style
* String of the form <code>stylename[;key=value]</code>.
* @param key
* Key of the style to be changed.
* @param value
* New value for the given key.
* @return Returns the new style.
*/
public static String setStyle(String style, String key, String value)
{
boolean isValue = value != null && value.length() > 0;
if (style == null || style.length() == 0)
{
if (isValue)
{
style = key + "=" + value;
}
}
else
{
int index = style.indexOf(key + "=");
if (index < 0)
{
if (isValue)
{
String sep = (style.endsWith(";")) ? "" : ";";
style = style + sep + key + '=' + value;
}
}
else
{
String tmp = (isValue) ? key + "=" + value : "";
int cont = style.indexOf(";", index);
if (!isValue)
{
cont++;
}
style = style.substring(0, index) + tmp
+ ((cont > index) ? style.substring(cont) : "");
}
}
return style;
}
/**
* Sets or toggles the flag bit for the given key in the cell's styles. If
* value is null then the flag is toggled.
*
* <code>
* mxUtils.setCellStyleFlags(graph.getModel(),
* cells,
* mxConstants.STYLE_FONTSTYLE,
* mxConstants.FONT_BOLD, null);
* </code>
*
* Toggles the bold font style.
*
* @param model
* Model that contains the cells.
* @param cells
* Array of cells to change the style for.
* @param key
* Key of the style to be changed.
* @param flag
* Integer for the bit to be changed.
* @param value
* Optional boolean value for the flag.
*/
public static void setCellStyleFlags(mxIGraphModel model, Object[] cells,
String key, int flag, Boolean value)
{
if (cells != null && cells.length > 0)
{
model.beginUpdate();
try
{
for (int i = 0; i < cells.length; i++)
{
if (cells[i] != null)
{
String style = setStyleFlag(model.getStyle(cells[i]),
key, flag, value);
model.setStyle(cells[i], style);
}
}
}
finally
{
model.endUpdate();
}
}
}
/**
* Sets or removes the given key from the specified style and returns the
* new style. If value is null then the flag is toggled.
*
* @param style
* String of the form stylename[;key=value].
* @param key
* Key of the style to be changed.
* @param flag
* Integer for the bit to be changed.
* @param value
* Optional boolean value for the given flag.
*/
public static String setStyleFlag(String style, String key, int flag,
Boolean value)
{
if (style == null || style.length() == 0)
{
if (value == null || value.booleanValue())
{
style = key + "=" + flag;
}
else
{
style = key + "=0";
}
}
else
{
int index = style.indexOf(key + "=");
if (index < 0)
{
String sep = (style.endsWith(";")) ? "" : ";";
if (value == null || value.booleanValue())
{
style = style + sep + key + "=" + flag;
}
else
{
style = style + sep + key + "=0";
}
}
else
{
int cont = style.indexOf(";", index);
String tmp = "";
int result = 0;
if (cont < 0)
{
tmp = style.substring(index + key.length() + 1);
}
else
{
tmp = style.substring(index + key.length() + 1, cont);
}
if (value == null)
{
result = Integer.parseInt(tmp) ^ flag;
}
else if (value.booleanValue())
{
result = Integer.parseInt(tmp) | flag;
}
else
{
result = Integer.parseInt(tmp) & ~flag;
}
style = style.substring(0, index) + key + "=" + result
+ ((cont >= 0) ? style.substring(cont) : "");
}
}
return style;
}
}