com.netxforge.screens.editing.base.util.WinForms.java Source code

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Here is the source code for com.netxforge.screens.editing.base.util.WinForms.java

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/*******************************************************************************
 * Copyright (c) 31 jan. 2014 NetXForge.
 * 
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details. You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>
 * 
 * Contributors: Christophe Bouhier - initial API and implementation and/or
 * initial documentation
 *******************************************************************************/
package com.netxforge.screens.editing.base.util;

import org.eclipse.emf.edit.ui.dnd.LocalTransfer;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.dnd.DropTargetAdapter;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.ui.forms.widgets.Form;
import org.eclipse.ui.forms.widgets.FormToolkit;

import com.netxforge.screens.editing.base.ScreenUtil;

/**
 * Support for windows ( {@link Form} forms ) in a parent {@link Form}.
 * 
 * 
 * @author Christophe
 * 
 */
public class WinForms {

    private Composite content;
    private ScrolledComposite canvas;

    private FormToolkit toolkit;

    /**
     * Our default Drop target adapter.
     */
    private final DropTargetAdapter DEFAULT_DROP_ADAPTER = new DropTargetAdapter() {

        @Override
        public void drop(DropTargetEvent event) {

            LocalTransfer localTransfer = LocalTransfer.getInstance();
            if (localTransfer.isSupportedType(event.currentDataType)) {
                // Transfer the data and, if non-null, extract it.
                //
                Object object = localTransfer.nativeToJava(event.currentDataType);

                MessageDialog.openInformation(Display.getDefault().getActiveShell(), "Thanx for droppint by!",
                        "So you drop details: " + event.toString() + " ...and the data is this: " + object);
            }
        }
    };

    public void buildUI(Composite parent, FormToolkit toolkit) {
        this.toolkit = toolkit;
        canvas = new ScrolledComposite(parent, SWT.NONE | SWT.V_SCROLL | SWT.H_SCROLL);

        canvas.addListener(SWT.Activate, new Listener() {
            public void handleEvent(Event e) {
                content.setFocus();
            }
        });

        toolkit.adapt(canvas);
        toolkit.paintBordersFor(canvas);
        canvas.setExpandVertical(true);
        canvas.setExpandHorizontal(true);

        content = toolkit.createComposite(canvas, SWT.NONE);
        RowLayout rowLayout = new RowLayout();
        rowLayout.wrap = true;
        rowLayout.spacing = 10;
        rowLayout.marginLeft = 10;
        rowLayout.marginTop = 10;
        rowLayout.marginRight = 10;

        content.setLayout(rowLayout);
        JFaceResources.getColorRegistry().put("canvas_color", new RGB(255, 250, 221));
        content.setBackground(JFaceResources.getColorRegistry().get("canvas_color"));
        toolkit.paintBordersFor(content);

        canvas.setContent(content);

        // When the row layout wraps, this changes the width of the content 
        // so we show a scrollbar when smaller than the computed width of the content.    
        canvas.addControlListener(new ControlAdapter() {
            @Override
            public void controlResized(ControlEvent e) {
                Rectangle r = canvas.getClientArea();
                canvas.setMinSize(content.computeSize(r.width, SWT.DEFAULT));
            }
        });

        // Add a local drop target to the content.
        // The windows will also support dropping stuff.

    }

    /**
     * Add a window.
     * 
     * @return
     */
    public Form addWindow() {
        return addWindow(null, null);
    }

    public Form addWindow(DropTargetAdapter dropTarget, Transfer[] transfers) {

        final Form winForm = toolkit.createForm(content);
        winForm.setSeparatorVisible(false);

        // Use a local transfer.
        winForm.addTitleDropSupport(ScreenUtil.DROP_OPERATIONS,
                transfers != null ? transfers : new Transfer[] { LocalTransfer.getInstance() },
                dropTarget != null ? dropTarget : DEFAULT_DROP_ADAPTER);

        toolkit.paintBordersFor(winForm);
        toolkit.decorateFormHeading(winForm);
        winForm.setText("Chart:");
        winForm.getBody().setMenu(new Menu(winForm.getShell(), SWT.POP_UP));

        // Will push the content size, which should trigger the extension of the
        // ScrolledLayout.
        content.pack();
        content.layout();
        //      canvas.layout();
        return winForm;

    }

    public void removeWindow(Form winForm) {
        winForm.dispose();
        content.layout();
    }

    public void addWinFormActions(Form winForm, IAction[] actions) {

        for (IAction a : actions) {
            winForm.getToolBarManager().add(a);
        }
        winForm.getToolBarManager().update(true);
    }

    public void clear() {
        for (Control c : content.getChildren()) {
            c.dispose();
        }
    }

    public void layout() {
        content.layout();
    }

    public Composite getContent() {
        return content;
    }
}