copypropertyaction.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/properties/CopyPropertyAction.java,v 1.1 2006/11/17 03:15:13 niegy Exp $
 * $Revision: 1.1 $
 * $Date: 2006/11/17 03:15:13 $
 *
 *==============================================================================
 *
 * Copyright (c) 2001-2006 Primeton Technologies, Ltd.
 * All rights reserved. 
 * 
 * Created on 2006-10-26
 *******************************************************************************/


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

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.views.properties.PropertiesMessages;
import org.eclipse.ui.views.properties.IPropertySheetEntry;

/**
 * TODO此处填写 class 信息
 *
 * @author niegy (mailto:[e-mail])
 */
/*
 * 修改历史
 * $Log: CopyPropertyAction.java,v $
 * Revision 1.1  2006/11/17 03:15:13  niegy
 * create
 * 
 */
public class CopyPropertyAction extends PropertySheetActionEx {
    /**
     * System clipboard
     */
    private Clipboard clipboard;

    /**
     * Creates the action.
     * 
     * @param viewer the viewer
     * @param name the name
     * @param clipboard the clipboard
     */
    public CopyPropertyAction(PropertySheetViewerEx viewer, String name,
            Clipboard clipboard) {
        super(viewer, name);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
                IPropertiesHelpContextIds.COPY_PROPERTY_ACTION);
        this.clipboard = clipboard;
    }

    /**
     * Performs this action.
     */
    public void run() {
        // Get the selected property
        IStructuredSelection selection = (IStructuredSelection) getPropertySheet()
                .getSelection();
        if (selection.isEmpty()) {
            return;
        }
        // Assume single selection
        IPropertySheetEntry entry = (IPropertySheetEntry) selection
                .getFirstElement();

        // Place text on the clipboard
        StringBuffer buffer = new StringBuffer();
        buffer.append(entry.getDisplayName());
        buffer.append("\t"); //$NON-NLS-1$
        buffer.append(entry.getValueAsString());

        setClipboard(buffer.toString());
    }

    /** 
     * Updates enablement based on the current selection.
     * 
     * @param sel the selection
     */
    public void selectionChanged(IStructuredSelection sel) {
        setEnabled(!sel.isEmpty());
    }

    private void setClipboard(String text) {
        try {
            Object[] data = new Object[] { text };
            Transfer[] transferTypes = new Transfer[] { TextTransfer
                    .getInstance() };
            clipboard.setContents(data, transferTypes);
        } catch (SWTError e) {
            if (e.code != DND.ERROR_CANNOT_SET_CLIPBOARD) {
                throw e;
            }
            if (MessageDialog.openQuestion(getPropertySheet().getControl()
                    .getShell(), PropertiesMessages.CopyToClipboardProblemDialog_title,
                    PropertiesMessages.CopyToClipboardProblemDialog_message)) {
                setClipboard(text);
            }
        }
    }
}