OperatorOperandsViewer.java

package damp.ekeko.snippets.gui;

import org.eclipse.jface.action.IStatusLineManager;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.TreeViewerColumn;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeColumn;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IViewSite;
import org.eclipse.ui.IWorkbenchPartSite;
import org.eclipse.ui.PlatformUI;

import damp.ekeko.snippets.data.SnippetOperator;
import damp.ekeko.snippets.data.TemplateGroup;

public class OperatorOperandsViewer extends SashForm {

	
	private TreeViewer operatorTreeViewer;
	private Tree operatorTree;
	private TableViewer operandsTableViewer;
	private Table operandsTable;

	private TemplateGroup jGroup;
	private Object cljSnippet,  cljSelectedSnippetNode;
	private Label operatorLabel;
	
	public OperatorOperandsViewer(Composite parent, int style) {
		super(parent, style);
		
		GridLayout gridLayout = new GridLayout(1, false);
		gridLayout.marginWidth = 0;
		gridLayout.marginHeight = 0;
		this.setLayout(gridLayout);

		operatorTreeViewer = new TreeViewer(this, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION);
		operatorTreeViewer.setAutoExpandLevel(3);
		operatorTree = operatorTreeViewer.getTree();
		GridData gd_operatorTree = new GridData(SWT.FILL, SWT.TOP, true, false, 1, 1);
//		gd_operatorTree.heightHint = 400;
		operatorTree.setLayoutData(gd_operatorTree);
		
		TreeViewerColumn operatorNameColumn = new TreeViewerColumn(operatorTreeViewer, SWT.NONE);
		TreeColumn trclmnOperator = operatorNameColumn.getColumn();
		trclmnOperator.setWidth(200);
		trclmnOperator.setText("Operator");

		//ColumnViewerToolTipSupport.enableFor(operatorTreeViewer, ToolTip.NO_RECREATE);
		
		operatorNameColumn.setLabelProvider(new OperatorTreeLabelProvider());
		operatorTreeViewer.setContentProvider(new OperatorTreeContentProvider());


		operatorTree.addListener(SWT.Selection, new Listener() {
			public void handleEvent(Event e) {
				updateWidgets();
			}
		});		

		/*
		TextViewer textViewer = new TextViewer(this, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
		textOpInfo = textViewer.getTextWidget();
		textOpInfo.setEditable(false);
		GridData gd_textOpInfo = new GridData(SWT.FILL, SWT.TOP, true, false, 1, 1);
		gd_textOpInfo.heightHint = 50;
		textOpInfo.setLayoutData(gd_textOpInfo);
		*/
		
		operatorLabel = new Label(this, SWT.NONE | SWT.WRAP);
		GridData gd_operatorLabel = new GridData(SWT.FILL, SWT.FILL, true, false, 1, 1);
//		gd_operatorLabel.heightHint = 31;
		operatorLabel.setLayoutData(gd_operatorLabel);
		
		operandsTableViewer = new TableViewer(this, SWT.BORDER | SWT.FULL_SELECTION);
		operandsTable = operandsTableViewer.getTable();
		operandsTable.setLinesVisible(true);
		operandsTable.setHeaderVisible(true);
		GridData gd_tableOpArgs = new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1);
		gd_tableOpArgs.heightHint = 31;
		operandsTable.setLayoutData(gd_tableOpArgs);
		
		operandsTableViewer.setContentProvider(new ArrayContentProvider());
		
		
		//operandsTableDecorator = new OperandsTableDecorator(operandsTable);
		
		TableViewerColumn operandDescriptionCol = new TableViewerColumn(operandsTableViewer, SWT.NONE);
		TableColumn operandDescriptionColCol = operandDescriptionCol.getColumn();
		operandDescriptionColCol.setWidth(150);
		operandDescriptionColCol.setText("Operand");
		operandDescriptionCol.setLabelProvider(new OperandBindingLabelProviderDescription());
		
		
		TableViewerColumn operandValueCol = new TableViewerColumn(operandsTableViewer, SWT.NONE);
		TableColumn operandValueColCol = operandValueCol.getColumn();
		operandValueColCol.setWidth(150);
		operandValueColCol.setText("Value");
		
		operandValueCol.setLabelProvider(new OperatorOperandBindingLabelProviderValue());
		operandValueCol.setEditingSupport(new OperatorOperandBindingEditingSupport(this));

		this.setOrientation(SWT.VERTICAL);
		this.setWeights(new int[] {8,1,3});

	}
	
	public Object getSelectedOperator() {
        IStructuredSelection selection = (IStructuredSelection) operatorTreeViewer.getSelection();
        return selection.getFirstElement();
	}
	
	public Object getOperands() {
		return operandsTableViewer.getInput();
	}
	
	public TemplateGroup getTemplateGroup() {
		return jGroup;
	}

	public void setInput(TemplateGroup jGroup, Object cljSnippet, Object cljSelectedSnippetNode) {
		this.jGroup = jGroup;
		this.cljSnippet = cljSnippet;
		this.cljSelectedSnippetNode = cljSelectedSnippetNode;
		updateWidgets();
	}
	
	private void updateWidgets() {
		//clear errors from cell editor validators
		updateWorkbenchStatusErrorLine("");
		
		operatorTreeViewer.setInput(new TemplateGroupTemplateElement(jGroup.getGroup(), cljSnippet, cljSelectedSnippetNode));
		for(TreeColumn tc : operatorTree.getColumns())
                  tc.pack(); //resizes
        		
		
		Object selectedOperator = getSelectedOperator();
		if(selectedOperator == null || !SnippetOperator.isOperator(selectedOperator)) {
			operandsTableViewer.setInput(null);
			operatorLabel.setText("");
			return;	
		}
		
		//textOpInfo.setText(SnippetOperator.getDescription(selectedOperator));
		operatorLabel.setText(SnippetOperator.getDescription(selectedOperator));
		operandsTableViewer.setInput(SnippetOperator.getOperands(jGroup.getGroup(), cljSnippet, cljSelectedSnippetNode, selectedOperator));

	}

	public void updateWorkbenchStatusErrorLine(String message) {
		IWorkbenchPartSite site = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart().getSite();
		//TODO: figure out nicer way to get to the site of the view in which this viewer is embedded
		IActionBars actionBars;
		if(site instanceof IViewSite) {
			IViewSite viewSite = (IViewSite) site;
			actionBars = viewSite.getActionBars();
		} else {
			IEditorSite editorSite = (IEditorSite) site;
			actionBars = editorSite.getActionBars();
		}
		IStatusLineManager statusLineManager = actionBars.getStatusLineManager();
		statusLineManager.setErrorMessage(message);
	}
		

	public TableViewer getTableViewer() {
		return operandsTableViewer;
	}
	

	public Object getSnippet() {
		return cljSnippet;
	}
	
	
	public Object getSelectedSnippetNode() {
		return cljSelectedSnippetNode;
	}

	
	
	

}