bsfpreferencepage.java

一个java写的business process management系统

/*
 * Copyright (c) 2003-2004, Alexander Greif
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Flow4J-Eclipse project nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.orthanc.flow4j.designer.ui.preferences;

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;

import net.orthanc.flow4j.bsf.BSFEngineDescriptor;
import net.orthanc.flow4j.bsf.Flow4JBSFManager;
import net.orthanc.flow4j.designer.core.Flow4JPlugin;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferencePage;
import org.eclipse.jface.viewers.ColumnLayoutData;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IColorProvider;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyAdapter;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPreferencePage;

/**
 * @author greifa
 *
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class BSFPreferencePage
	extends PreferencePage
	implements IWorkbenchPreferencePage {

	private TableViewer engineDescTable;
	protected Button envAddButton;
	protected Button envEditButton;
	protected Button envRemoveButton;

	protected SimpleEngineDescContentProvider engineDescContentProvider =
		new SimpleEngineDescContentProvider();

	protected static final String LANGUAGE_LABEL = Flow4JPlugin.getResourceString("PreferencePage_BSFEngine_Language.label"); //$NON-NLS-1$
	protected static final String ENGINECLASS_LABEL = Flow4JPlugin.getResourceString("PreferencePage_BSFEngine_EngineClass.label"); //$NON-NLS-1$
	protected static final String EXTENSIONS_LABEL = Flow4JPlugin.getResourceString("PreferencePage_BSFEngine_Extensions.label"); //$NON-NLS-1$

	protected static String[] engineDescTableColumnProperties = { "language", //$NON-NLS-1$
		"engineclass", //$NON-NLS-1$
		"extensions" //$NON-NLS-1$
	};
	protected String[] engineDescTableColumnHeaders = { Flow4JPlugin.getResourceString("PreferencePage_BSF_Columm_Language.label"), //$NON-NLS-1$
		Flow4JPlugin.getResourceString("PreferencePage_BSF_Columm_EngineClass.label"), //$NON-NLS-1$
		Flow4JPlugin.getResourceString("PreferencePage_BSF_Columm_Extensions.label") //$NON-NLS-1$
	};
	protected ColumnLayoutData[] engineDescTableColumnLayouts =
		{
			new ColumnWeightData(18),
			new ColumnWeightData(75),
			new ColumnWeightData(27)};

	public BSFPreferencePage() {
		setDescription(Flow4JPlugin.getResourceString("PreferencePage_BSF.title")); //$NON-NLS-1$
	}

	protected Control createContents(Composite parent) {
		noDefaultAndApplyButton();
		Font font = parent.getFont();
		//The main composite
		Composite composite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		layout.numColumns = 2;
		composite.setLayout(layout);
		composite.setFont(font);

		createTable(composite);
		createButtons(composite);
		return composite;
	}

	/**
	 * Creates and configures the table containing launch configuration variables
	 * and their associated value.
	 */
	private void createTable(Composite parent) {
		Font font = parent.getFont();
		// Create table composite
		Composite tableComposite = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		layout.numColumns = 1;
		GridData gridData = new GridData(GridData.FILL_BOTH);
		gridData.heightHint = 150;
		gridData.widthHint = 400;
		tableComposite.setLayout(layout);
		tableComposite.setLayoutData(gridData);
		tableComposite.setFont(font);
		// Create table
		engineDescTable =
			new TableViewer(
				tableComposite,
				SWT.BORDER
					| SWT.H_SCROLL
					| SWT.V_SCROLL
					| SWT.MULTI
					| SWT.FULL_SELECTION);
		Table table = engineDescTable.getTable();
		TableLayout tableLayout = new TableLayout();
		table.setLayout(tableLayout);
		table.setHeaderVisible(true);
		table.setLinesVisible(true);
		table.setFont(font);
		gridData = new GridData(GridData.FILL_BOTH);
		engineDescTable.getControl().setLayoutData(gridData);
		engineDescTable.setContentProvider(engineDescContentProvider);
		engineDescTable.setColumnProperties(engineDescTableColumnProperties);
		engineDescTable.setSorter(new ViewerSorter() {
			public int compare(Viewer iViewer, Object e1, Object e2) {
				if (e1 == null) {
					return -1;
				} else if (e2 == null) {
					return 1;
				} else {
					return ((BSFEngineDescriptor) e1)
						.getLanguage()
						.compareToIgnoreCase(
						((BSFEngineDescriptor) e2).getLanguage());
				}
			}
		});

		engineDescTable
			.addSelectionChangedListener(new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				handleTableSelectionChanged(event);
			}
		});

		engineDescTable.addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				if (!engineDescTable.getSelection().isEmpty()) {
					handleEditButtonPressed();
				}
			}
		});
		engineDescTable.getTable().addKeyListener(new KeyAdapter() {
			public void keyPressed(KeyEvent event) {
				if (event.character == SWT.DEL && event.stateMask == 0) {
					handleRemoveButtonPressed();
				}
			}
		});

		// Create columns
		for (int i = 0; i < engineDescTableColumnHeaders.length; i++) {
			tableLayout.addColumnData(engineDescTableColumnLayouts[i]);
			TableColumn tc = new TableColumn(table, SWT.NONE, i);
			tc.setResizable(engineDescTableColumnLayouts[i].resizable);
			tc.setText(engineDescTableColumnHeaders[i]);
		}
		engineDescTable.setInput(getBSFManager());
		engineDescTable.setLabelProvider(new SimpleVariableLabelProvider());
	}

	/**
	 * Creates the new/edit/remove buttons for the engine descriptor table
	 * @param parent the composite in which the buttons should be created
	 */
	private void createButtons(Composite parent) {
		// Create button composite
		Composite buttonComposite = new Composite(parent, SWT.NONE);
		GridLayout glayout = new GridLayout();
		glayout.marginHeight = 0;
		glayout.marginWidth = 0;
		glayout.numColumns = 1;
		GridData gdata = new GridData(GridData.VERTICAL_ALIGN_BEGINNING);
		buttonComposite.setLayout(glayout);
		buttonComposite.setLayoutData(gdata);
		buttonComposite.setFont(parent.getFont());

		// Create buttons
		envAddButton = createPushButton(buttonComposite, Flow4JPlugin.getResourceString("PreferencePage_BSF_Button_New.label"), null); //$NON-NLS-1$
		envAddButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				handleAddButtonPressed();
			}
		});
		envEditButton = createPushButton(buttonComposite, Flow4JPlugin.getResourceString("PreferencePage_BSF_Button_Edit.label"), null); //$NON-NLS-1$
		envEditButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				handleEditButtonPressed();
			}
		});
		envEditButton.setEnabled(false);
		envRemoveButton = createPushButton(buttonComposite, Flow4JPlugin.getResourceString("PreferencePage_BSF_Button_Remove.label"), null); //$NON-NLS-1$
		envRemoveButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				handleRemoveButtonPressed();
			}
		});
		envRemoveButton.setEnabled(false);
	}

	/**
	 * Creates and returns a new push button with the given
	 * label and/or image.
	 * 
	 * @param parent parent control
	 * @param label button label or <code>null</code>
	 * @param image image of <code>null</code>
	 * 
	 * @return a new push button
	 */
	public static Button createPushButton(
		Composite parent,
		String label,
		Image image) {
		Button button = new Button(parent, SWT.PUSH);
		button.setFont(parent.getFont());
		if (image != null) {
			button.setImage(image);
		}
		if (label != null) {
			button.setText(label);
		}
		GridData gd = new GridData();
		button.setLayoutData(gd);
		setButtonDimensionHint(button);
		return button;
	}

	/**
	 * Sets width and height hint for the button control.
	 * <b>Note:</b> This is a NOP if the button's layout data is not
	 * an instance of <code>GridData</code>.
	 * 
	 * @param	the button for which to set the dimension hint
	 */
	public static void setButtonDimensionHint(Button button) {
		Object gd = button.getLayoutData();
		if (gd instanceof GridData) {
			((GridData) gd).heightHint = getButtonHeigthHint(button);
			((GridData) gd).widthHint = getButtonWidthHint(button);
			((GridData) gd).horizontalAlignment = GridData.FILL;
		}
	}

	/**
	 * Returns a width hint for a button control.
	 */
	public static int getButtonWidthHint(Button button) {
		GC gc = new GC(button);
		gc.setFont(button.getFont());
		FontMetrics fFontMetrics = gc.getFontMetrics();
		gc.dispose();
		int widthHint =
			Dialog.convertHorizontalDLUsToPixels(
				fFontMetrics,
				IDialogConstants.BUTTON_WIDTH);
		return Math.max(
			widthHint,
			button.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);