org.gems.ajax.client.figures.FloatingHorizontalPanel.java Source code

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Here is the source code for org.gems.ajax.client.figures.FloatingHorizontalPanel.java

Source

package org.gems.ajax.client.figures;

import org.gems.ajax.client.util.GraphicsConstants;
import org.gems.ajax.client.util.Util;

import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.DeferredCommand;
import com.google.gwt.user.client.ui.HorizontalPanel;

/*******************************************************************************
 * Copyright (c) 2007 Jules White. All rights reserved. This program and the
 * accompanying materials are made available under the terms of the Eclipse
 * Public License v1.0 which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: Jules White - initial API and implementation
 ******************************************************************************/

public class FloatingHorizontalPanel extends HorizontalPanel implements GraphicsConstants, DiagramElementListener {

    private DiagramElement parent_;
    private GEMSDiagram diagram_;
    private boolean onBottom_ = false;

    public FloatingHorizontalPanel(boolean onb) {
        onBottom_ = onb;
        setStyleName(FLOATING_PANEL_STYLE);
        setHorizontalAlignment(ALIGN_CENTER);
    }

    public void attach(DiagramElement parent) {
        if (diagram_ != null) {
            diagram_.remove(this);
            diagram_ = null;
        }
        parent_ = parent;
        diagram_ = parent.getDiagram();
        diagram_.add(this,
                Util.getDiagramX(parent.getDiagramWidget())
                        + Util.half(parent.getDiagramWidget().getOffsetWidth() - getOffsetWidth()),
                Util.getDiagramY(parent.getDiagramWidget()) - getTopInset());
        parent.addDiagramElementListener(this);

        updateLocation(parent);
    }

    protected void onAttach() {
        super.onAttach();
        if (parent_ != null) {
            DeferredCommand.addCommand(new Command() {

                public void execute() {
                    updateLocation(parent_);
                }

            });
        }
    }

    public void detach() {
        if (diagram_ != null) {
            diagram_.remove(this);
            diagram_ = null;
        }
    }

    public void updateLocation(DiagramElement parent) {
        if (diagram_ != null) {
            if (!onBottom_)
                diagram_.setWidgetPosition(this,
                        Util.getDiagramX(parent.getDiagramWidget())
                                + Util.half(parent.getDiagramWidget().getOffsetWidth() - getOffsetWidth()),
                        Util.getDiagramY(parent.getDiagramWidget()) - getOffsetHeight());
            else
                diagram_.setWidgetPosition(this,
                        Util.getDiagramX(parent.getDiagramWidget())
                                + Util.half(parent.getDiagramWidget().getOffsetWidth() - getOffsetWidth()),
                        Util.getDiagramY(parent.getDiagramWidget()) + parent.getDiagramWidget().getOffsetHeight());
        }
    }

    public int getTopInset() {
        return 0;
    }

    public int getLeftInset() {
        return 27;
    }

    public void onCollapse(AbstractDiagramElement p) {
        updateLocation(p);
    }

    public void onExpand(AbstractDiagramElement p) {
        updateLocation(p);
    }

    public void onMove(DiagramElement p) {
        updateLocation(p);
    }

    public void onResize(AbstractDiagramElement p, String w, String h) {
        updateLocation(p);
    }

    public void onChildAdded(AbstractDiagramElement p) {
    }

    public void onChildRemoved(AbstractDiagramElement p) {
    }

}