140 lines
3.6 KiB
Java
140 lines
3.6 KiB
Java
import java.util.Vector;
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/**
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* Map an arbitrary object into parts of a tree node.
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*/
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abstract class NodeHandler
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{
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/** This vector is used as cache for the child objects.
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*/
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protected Vector maChildList;
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public abstract NodeHandler createHandler (
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drafts.com.sun.star.accessibility.XAccessibleContext xContext);
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public NodeHandler ()
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{
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maChildList = new Vector ();
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}
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/** Clear the cache of child objects.
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*/
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public void clear ()
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{
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synchronized (maChildList)
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{
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maChildList = new Vector ();
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}
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}
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/** This factory method creates an individual handler for the specified
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object that may hold information to accelerate the access to its children.
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*/
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// public abstract NodeHandler createHandler (Object aObject);
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/** return the number of children this object has */
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public int getChildCount(Object aObject)
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{
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synchronized (maChildList)
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{
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return maChildList.size();
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}
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}
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/**
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* return a child object. Complex
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* children have to be AccTreeNode instances.
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* @see AccTreeNode
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*/
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public AccessibleTreeNode getChild (AccessibleTreeNode aParent, int nIndex)
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{
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synchronized (maChildList)
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{
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AccessibleTreeNode aChild = (AccessibleTreeNode)maChildList.get(nIndex);
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if (aChild == null)
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{
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aChild = createChild (aParent, nIndex);
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if (aChild == null)
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aChild = new StringNode ("could not create child", aParent);
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maChildList.setElementAt (aChild, nIndex);
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}
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return aChild;
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}
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}
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public AccessibleTreeNode getChildNoCreate (AccessibleTreeNode aParent, int nIndex)
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{
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synchronized (maChildList)
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{
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return (AccessibleTreeNode)maChildList.get(nIndex);
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}
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}
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/** Remove the specified child from the list of children.
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*/
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public boolean removeChild (AccessibleTreeNode aNode, int nIndex)
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{
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try
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{
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synchronized (maChildList)
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{
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System.out.println (" removing child at position " + nIndex + ": "
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+ maChildList.elementAt (nIndex));
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maChildList.remove (nIndex);
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}
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}
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catch (Exception e)
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{
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return false;
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}
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return true;
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}
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public int indexOf (AccessibleTreeNode aNode)
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{
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synchronized (maChildList)
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{
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return maChildList.indexOf (aNode);
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}
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}
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/** Create a child object for the specified data. This method is called
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usually from getChild and put there into the cache.
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*/
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public abstract AccessibleTreeNode createChild (
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AccessibleTreeNode aParent, int nIndex);
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//
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// The following methods support editing of children and actions.
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// They have default implementations for no actions and read-only.
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//
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/** May this child be changed? */
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public boolean isChildEditable (AccessibleTreeNode aNode, int nIndex)
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{
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return false;
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}
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/** change this child's value */
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// public void setChild(Object aObject, int nIndex) { }
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/** get names of suported actions */
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public String[] getActions (AccessibleTreeNode aNode)
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{
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return new String[] {};
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}
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/** perform action */
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public void performAction (AccessibleTreeNode aNode, int nIndex)
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{
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}
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/** Update all children.
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*/
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public void update (AccessibleTreeNode aNode)
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{
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}
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}
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