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Advanced grid components for Apache Wicket
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package com.inmethod.grid.treegrid;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreeNode;
import com.inmethod.icon.Icon;
import com.inmethod.icon.IconImage;
import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.form.AjaxSubmitLink;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.request.Response;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.util.io.IClusterable;
/**
* Represents the content of a tree column cell.
*
* @param
* tree model object type
* @param
* node model object type
*
* @author Matej Knopp
*/
public abstract class TreePanel extends Panel
{
private static final long serialVersionUID = 1L;
private static final String JUNCTION_LINK_ID = "junctionLink";
private static final String NODE_COMPONENT_ID = "nodeComponent";
/**
* Constructor.
*
* @param id
* component id
* @param model
* model to access the {@link TreeNode}
* @param level
* node depth level
*/
public TreePanel(String id, final IModel model, int level)
{
super(id, model);
this.level = level;
}
private final int level;
@Override
protected void onInitialize()
{
super.onInitialize();
// add junction link
Object node = getDefaultModelObject();
Component junctionLink = newJunctionLink(this, JUNCTION_LINK_ID, node);
junctionLink.add(new JunctionBorder(node, level));
add(junctionLink);
// add node component
Component nodeComponent = newNodeComponent(NODE_COMPONENT_ID, getDefaultNodeModel());
add(nodeComponent);
IconImage icon = new IconImage("icon", new IconModel())
{
private static final long serialVersionUID = 1L;
@Override
public boolean isVisible()
{
return getIcon() != null;
}
};
icon.add(IconBorder.INSTANCE);
add(icon);
}
/**
* Returns the icon component instance.
*
* @return icon component
*/
public IconImage getIconComponent()
{
return (IconImage)get("icon");
}
/**
* Simple adapter that returns icon for this panel
*
* @author Matej Knopp
*/
private class IconModel implements IModel
{
private static final long serialVersionUID = 1L;
/**
* {@inheritDoc}
*/
public Icon getObject()
{
return getIcon(getDefaultNodeModel());
}
/**
* {@inheritDoc}
*/
public void setObject(Icon object)
{
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*/
public void detach()
{
}
};
/**
* Return the icon for this node or null if no icon should be used.
*
* @param model
* model for the TreeNode
* @return icon instance or null
*/
protected abstract Icon getIcon(IModel model);
/**
* Creates a new component for the given TreeNode.
*
* @param id
* component ID
* @param model
* model that returns the node
* @return component for node
*/
protected abstract Component newNodeComponent(String id, IModel model);
protected IModel getDefaultNodeModel()
{
return (IModel)getDefaultModel();
}
/**
* Very simple border that adds a proper ");
}
/**
* {@inheritDoc}
*/
@Override
public void afterRender(Component component)
{
RequestCycle.get().getResponse().write(" ");
}
private static final IconBorder INSTANCE = new IconBorder();
};
/**
* Class that wraps a link (or span) with a junction table cells.
*
* @author Matej Knopp
*/
private static class JunctionBorder extends Behavior
{
private static final long serialVersionUID = 1L;
private final int level;
/**
* Construct.
*
* @param node
* @param level
*/
public JunctionBorder(Object node, int level)
{
this.level = level;
}
/**
* {@inheritDoc}
*/
@Override
public void afterRender(Component component)
{
RequestCycle.get().getResponse().write("");
}
/**
* {@inheritDoc}
*/
@Override
public void beforeRender(Component component)
{
Response response = RequestCycle.get().getResponse();
for (int i = level - 1; i >= 0; --i)
{
response.write("");
}
};
private TreeGridBody getTreeGridBody()
{
return findParent(TreeGridBody.class);
};
/**
* Creates the junction link for given node. Also (optionally) creates the junction image. If
* the node is a leaf (it has no children), the created junction link is non-functional.
*
* @param parent
* parent component of the link
* @param id
* wicket:id of the component
* @param node
* tree node for which the link should be created.
* @return The link component
*/
protected Component newJunctionLink(MarkupContainer parent, final String id, final Object node)
{
final MarkupContainer junctionLink;
TreeModel model = (TreeModel)getTreeGridBody().getDefaultModelObject();
if (model.isLeaf(node) == false)
{
junctionLink = newLink(id, new ILinkCallback()
{
private static final long serialVersionUID = 1L;
public void onClick(AjaxRequestTarget target)
{
if (getTreeGridBody().isNodeExpanded2(node))
{
getTreeGridBody().getTreeState().collapseNode(node);
}
else
{
getTreeGridBody().getTreeState().expandNode(node);
}
onJunctionLinkClicked(target, node);
getTreeGridBody().updateTree(target);
}
});
junctionLink.add(new Behavior()
{
private static final long serialVersionUID = 1L;
@Override
public void onComponentTag(Component component, ComponentTag tag)
{
if (getTreeGridBody().isNodeExpanded2(node))
{
tag.put("class", "imxt-junction-open");
}
else
{
tag.put("class", "imxt-junction-closed");
}
}
});
}
else
{
junctionLink = new WebMarkupContainer(id)
{
private static final long serialVersionUID = 1L;
/**
* @see org.apache.wicket.Component#onComponentTag(org.apache.wicket.markup.ComponentTag)
*/
@Override
protected void onComponentTag(ComponentTag tag)
{
super.onComponentTag(tag);
tag.setName("span");
}
};
}
return junctionLink;
}
/**
* Helper class for calling an action from a link.
*
* @author Matej Knopp
*/
public interface ILinkCallback extends IClusterable
{
/**
* Called when the click is executed.
*
* @param target
* The ajax request target
*/
void onClick(AjaxRequestTarget target);
}
/**
* Creates a link of type specified by current linkType. When the links is clicked it calls the
* specified callback.
*
* @param id
* The component id
* @param callback
* The link call back
* @return The link component
*/
public MarkupContainer newLink(String id, final ILinkCallback callback)
{
return new AjaxSubmitLink(id)
{
private static final long serialVersionUID = 1L;
@Override
protected void onSubmit(AjaxRequestTarget target)
{
callback.onClick(target);
}
}.setDefaultFormProcessing(false);
}
/**
* Callback function called after user clicked on an junction link. The node has already been
* expanded/collapsed (depending on previous status).
*
* @param target
* Request target - may be null on non-ajax call
*
* @param node
* Node for which this callback is relevant
*/
protected abstract void onJunctionLinkClicked(AjaxRequestTarget target, Object node);
}
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