labeldirecteditmanager.java

对eclipse gef进行封装,可以生成图形化编辑器

/*******************************************************************************
 * $Header: /cvsroot/EOS6/work_dir/niegy/com.primeton.studio.gef.ui/src/com/primeton/studio/gef/ui/parts/LabelDirectEditManager.java,v 1.2 2006/12/05 05:18:59 niegy Exp $
 * $Revision: 1.2 $
 * $Date: 2006/12/05 05:18:59 $
 *
 *==============================================================================
 *
 * Copyright (c) 2001-2006 Primeton Technologies, Ltd.
 * All rights reserved.
 * 
 * Created on 2006-11-21
 *******************************************************************************/


package com.primeton.studio.gef.ui.parts;

import org.eclipse.draw2d.IFigure;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.editparts.ZoomListener;
import org.eclipse.gef.editparts.ZoomManager;
import org.eclipse.gef.tools.CellEditorLocator;
import org.eclipse.gef.tools.DirectEditManager;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.actions.ActionFactory;
import org.eclipse.ui.part.CellEditorActionHandler;

import com.primeton.studio.gef.ui.figure.FigureTextCellEditor;

/**
 * TODO 此处填写 class 信息
 *
 * @author niegy (mailto:[e-mail])
 */
/*
 * 修改历史
 * $Log: LabelDirectEditManager.java,v $
 * Revision 1.2  2006/12/05 05:18:59  niegy
 * 修改模型，增加连线的扩展点
 *
 * Revision 1.1  2006/11/22 07:07:38  niegy
 * 增加table
 * 
 */
public class LabelDirectEditManager extends DirectEditManager {

	private IActionBars actionBars;
	private CellEditorActionHandler actionHandler;
	private double cachedZoom = -1.0;
	private IAction copy, cut, paste, undo, redo, find, selectAll, delete;
	private Font scaledFont;
	private ZoomListener zoomListener = new ZoomListener() {
		public void zoomChanged(double newZoom) {
			updateScaledFont(newZoom);
		}
	};
	
	private GraphicalEditPart editPart;

	public LabelDirectEditManager(GraphicalEditPart source, CellEditorLocator locator) {
		super(source, TextCellEditor.class, locator);
		editPart = source;
	}

	protected void bringDown() {
		ZoomManager zoomMgr = (ZoomManager)getEditPart().getViewer()
				.getProperty(ZoomManager.class.toString());
		zoomMgr.removeZoomListener(zoomListener);
		if (actionHandler != null) {
			actionHandler.dispose();
			actionHandler = null;
		}
		if (actionBars != null) {
			restoreSavedActions(actionBars);
			actionBars.updateActionBars();
			actionBars = null;
		}
		super.bringDown();
		disposeScaledFont();
	}

	/**
	 * Creates a multi-lined text celleditor that can wrap.
	 */
	protected CellEditor createCellEditorOn(Composite composite) {
		return new FigureTextCellEditor(composite, SWT.MULTI | SWT.WRAP,editPart);
	}

	private void disposeScaledFont() {
		if (scaledFont != null) {
			scaledFont.dispose();
			scaledFont = null;
		}
	}

	/**
	 * Used to determine the initial text of the cell editor and to determine the font size
	 * of the text.
	 * @return the figure being edited
	 */
	protected IFigure getDirectEditFigure() {
		return ((BaseEditPart)getEditPart()).getDirectEditFigure();
	}

	/**
	 * @return the initial value of the text shown in the cell editor for direct-editing;
	 * cannot return <code>null</code>
	 */
	protected String getInitialText() {
		return ((BaseEditPart)getEditPart()).getDirectEditText();
	}

	protected void initCellEditor() {
		getCellEditor().setValue(getInitialText());
		ZoomManager zoomMgr = (ZoomManager)getEditPart().getViewer()
				.getProperty(ZoomManager.class.toString());
		cachedZoom = -1.0;
		updateScaledFont(zoomMgr.getZoom());
		zoomMgr.addZoomListener(zoomListener);
		// Hook the cell editor's copy/paste actions to the actionBars so that they can
		// be invoked via keyboard shortcuts.
		actionBars = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage()
				.getActiveEditor().getEditorSite().getActionBars();
		saveCurrentActions(actionBars);
		actionHandler = new CellEditorActionHandler(actionBars);
		actionHandler.addCellEditor(getCellEditor());
		actionBars.updateActionBars();
	}

	private void restoreSavedActions(IActionBars actionBars){
		actionBars.setGlobalActionHandler(ActionFactory.COPY.getId(), copy);
		actionBars.setGlobalActionHandler(ActionFactory.PASTE.getId(), paste);
		actionBars.setGlobalActionHandler(ActionFactory.DELETE.getId(), delete);
		actionBars.setGlobalActionHandler(ActionFactory.SELECT_ALL.getId(), selectAll);
		actionBars.setGlobalActionHandler(ActionFactory.CUT.getId(), cut);
		actionBars.setGlobalActionHandler(ActionFactory.FIND.getId(), find);
		actionBars.setGlobalActionHandler(ActionFactory.UNDO.getId(), undo);
		actionBars.setGlobalActionHandler(ActionFactory.REDO.getId(), redo);
	}

	private void saveCurrentActions(IActionBars actionBars) {
		copy = actionBars.getGlobalActionHandler(ActionFactory.COPY.getId());
		paste = actionBars.getGlobalActionHandler(ActionFactory.PASTE.getId());
		delete = actionBars.getGlobalActionHandler(ActionFactory.DELETE.getId());
		selectAll = actionBars.getGlobalActionHandler(ActionFactory.SELECT_ALL.getId());
		cut = actionBars.getGlobalActionHandler(ActionFactory.CUT.getId());
		find = actionBars.getGlobalActionHandler(ActionFactory.FIND.getId());
		undo = actionBars.getGlobalActionHandler(ActionFactory.UNDO.getId());
		redo = actionBars.getGlobalActionHandler(ActionFactory.REDO.getId());
	}

	private void updateScaledFont(double zoom) {
		if (cachedZoom == zoom)
			return;
		
		Text text = (Text)getCellEditor().getControl();
		Font font = getEditPart().getFigure().getFont();
		
		disposeScaledFont();
		cachedZoom = zoom;
		if (zoom == 1.0)
			text.setFont(font);
		else {
			FontData fd = font.getFontData()[0];
			fd.setHeight((int)(fd.getHeight() * zoom));
			text.setFont(scaledFont = new Font(null, fd));
		}
	}

}