PreviewSettingsTopComponent.java

/*
Copyright 2008-2010 Gephi
Authors : Jérémy Subtil <jeremy.subtil@gephi.org>, Mathieu Bastian
Website : http://www.gephi.org

This file is part of Gephi.

DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

Copyright 2011 Gephi Consortium. All rights reserved.

The contents of this file are subject to the terms of either the GNU
General Public License Version 3 only ("GPL") or the Common
Development and Distribution License("CDDL") (collectively, the
"License"). You may not use this file except in compliance with the
License. You can obtain a copy of the License at
http://gephi.org/about/legal/license-notice/
or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the
specific language governing permissions and limitations under the
License.  When distributing the software, include this License Header
Notice in each file and include the License files at
/cddl-1.0.txt and /gpl-3.0.txt. If applicable, add the following below the
License Header, with the fields enclosed by brackets [] replaced by
your own identifying information:
"Portions Copyrighted [year] [name of copyright owner]"

If you wish your version of this file to be governed by only the CDDL
or only the GPL Version 3, indicate your decision by adding
"[Contributor] elects to include this software in this distribution
under the [CDDL or GPL Version 3] license." If you do not indicate a
single choice of license, a recipient has the option to distribute
your version of this file under either the CDDL, the GPL Version 3 or
to extend the choice of license to its licensees as provided above.
However, if you add GPL Version 3 code and therefore, elected the GPL
Version 3 license, then the option applies only if the new code is
made subject to such option by the copyright holder.

Contributor(s):

Portions Copyrighted 2011 Gephi Consortium.
 */
package org.gephi.desktop.preview;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
import java.text.NumberFormat;
import java.util.logging.Logger;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.gephi.desktop.io.export.api.VectorialFileExporterUI;
import org.gephi.desktop.preview.api.PreviewUIController;
import org.gephi.desktop.preview.api.PreviewUIModel;
import org.gephi.preview.api.PreviewController;
import org.gephi.preview.api.PreviewModel;
import org.gephi.preview.api.PreviewPreset;
import org.gephi.preview.spi.PreviewUI;
import org.gephi.ui.utils.UIUtils;
import org.openide.DialogDisplayer;
import org.openide.NotifyDescriptor;
import org.openide.awt.StatusDisplayer;
import org.openide.explorer.propertysheet.PropertySheet;
import org.openide.nodes.Node;
import org.openide.util.ImageUtilities;
import org.openide.util.Lookup;
import org.openide.util.NbBundle;
import org.openide.windows.TopComponent;
import org.openide.windows.WindowManager;

/**
 * 
 * @author Jérémy Subtil, Mathieu Bastian
 */
public final class PreviewSettingsTopComponent extends TopComponent implements PropertyChangeListener {
    
    private static PreviewSettingsTopComponent instance;
    static final String ICON_PATH = "org/gephi/desktop/preview/resources/settings.png";
    private static final String PREFERRED_ID = "PreviewSettingsTopComponent";
    private final String NO_SELECTION = "---";
    //Component
    private transient PropertySheet propertySheet;
    private transient JTabbedPane tabbedPane;
    //State
    private int defaultPresetLimit;
    
    private PreviewSettingsTopComponent() {
        initComponents();
        setName(NbBundle.getMessage(PreviewSettingsTopComponent.class, "CTL_PreviewSettingsTopComponent"));
//        setToolTipText(NbBundle.getMessage(PreviewSettingsTopComponent.class, "HINT_PreviewSettingsTopComponent"));
        setIcon(ImageUtilities.loadImage(ICON_PATH));
        if (UIUtils.isAquaLookAndFeel()) {
            mainPanel.setBackground(UIManager.getColor("NbExplorerView.background"));
        }

        // property sheet
        propertySheet = new PropertySheet();
        propertySheet.setNodes(new Node[]{new PreviewNode(propertySheet)});
        propertySheet.setDescriptionAreaVisible(false);

        //Tabs and PreviewUI
        PreviewUI[] previewUIs = Lookup.getDefault().lookupAll(PreviewUI.class).toArray(new PreviewUI[0]);
        if (previewUIs.length > 0) {
            tabbedPane = new JTabbedPane();
            tabbedPane.addTab(NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.propertySheetTab"), propertySheet);
            propertiesPanel.add(tabbedPane, BorderLayout.CENTER);
        } else {
            propertiesPanel.add(propertySheet, BorderLayout.CENTER);
        }

        //Ratio
        ratioSlider.addChangeListener(new ChangeListener() {
            
            NumberFormat formatter = NumberFormat.getPercentInstance();
            
            public void stateChanged(ChangeEvent e) {
                float val = ratioSlider.getValue() / 100f;
                if (val == 0f) {
                    ratioLabel.setText(NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.ratio.minimum"));
                } else {
                    ratioLabel.setText(formatter.format(val));
                }
                PreviewUIController puic = Lookup.getDefault().lookup(PreviewUIController.class);
                puic.setVisibilityRatio(getVisibilityRatio());
            }
        });

        //Presets
        presetComboBox.addItemListener(new ItemListener() {
            
            public void itemStateChanged(ItemEvent e) {
                PreviewUIController pc = Lookup.getDefault().lookup(PreviewUIController.class);
                PreviewUIModel previewModel = pc.getModel();
                if (previewModel != null && presetComboBox.getSelectedItem() instanceof PreviewPreset) {
                    if (previewModel.getCurrentPreset() != presetComboBox.getSelectedItem()) {
                        pc.setCurrentPreset((PreviewPreset) presetComboBox.getSelectedItem());
                        propertySheet.setNodes(new Node[]{new PreviewNode(propertySheet)});
                    }
                }
            }
        });

        //Export
        svgExportButton.addActionListener(new ActionListener() {
            
            public void actionPerformed(ActionEvent e) {
                VectorialFileExporterUI ui = Lookup.getDefault().lookup(VectorialFileExporterUI.class);
                ui.action();
            }
        });
        setup(null);
        
        PreviewUIController controller = Lookup.getDefault().lookup(PreviewUIController.class);
        controller.addPropertyChangeListener(this);
        
        PreviewUIModel m = controller.getModel();
        if (m != null) {
            setup(m);
            enableRefreshButton();
        }
    }
    
    public void propertyChange(PropertyChangeEvent evt) {
        if (evt.getPropertyName().equals(PreviewUIController.SELECT)) {
            PreviewUIModel model = (PreviewUIModel) evt.getNewValue();
            setup(model);
            if (model != null) {
                enableRefreshButton();
            } else {
                disableRefreshButton();
            }
        } else if (evt.getPropertyName().equals(PreviewUIController.REFRESHED)) {
        } else if (evt.getPropertyName().equals(PreviewUIController.REFRESHING)) {
            boolean refrehsing = (Boolean) evt.getNewValue();
            if (refrehsing) {
                disableRefreshButton();
            } else {
                enableRefreshButton();
            }
        }
    }
    
    public void setup(PreviewUIModel previewModel) {
        propertySheet.setNodes(new Node[]{new PreviewNode(propertySheet)});
        PreviewUIController previewUIController = Lookup.getDefault().lookup(PreviewUIController.class);
        if (previewModel != null) {
            ratioSlider.setValue((int) (previewModel.getVisibilityRatio() * 100));
        }

        //Presets
        if (previewModel == null) {
            saveButton.setEnabled(false);
            labelPreset.setEnabled(false);
            presetComboBox.setEnabled(false);
            presetComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[]{"---"}));
        } else {
            saveButton.setEnabled(true);
            labelPreset.setEnabled(true);
            presetComboBox.setEnabled(true);
            DefaultComboBoxModel comboBoxModel = new DefaultComboBoxModel();
            defaultPresetLimit = 0;
            for (PreviewPreset preset : previewUIController.getDefaultPresets()) {
                comboBoxModel.addElement(preset);
                defaultPresetLimit++;
            }
            PreviewPreset[] userPresets = previewUIController.getUserPresets();
            if (userPresets.length > 0) {
                comboBoxModel.addElement(NO_SELECTION);
                for (PreviewPreset preset : userPresets) {
                    comboBoxModel.addElement(preset);
                }
            }
            presetComboBox.setSelectedItem(previewModel.getCurrentPreset());
            presetComboBox.setModel(comboBoxModel);
        }

        //Refresh tabs
        if (tabbedPane != null) {
            int tabCount = tabbedPane.getTabCount();
            for (int i = 1; i < tabCount; i++) {
                tabbedPane.removeTabAt(i);
            }
            for (PreviewUI pui : Lookup.getDefault().lookupAll(PreviewUI.class)) {
                pui.unsetup();
            }
            if (previewModel != null) {
                PreviewController previewController = Lookup.getDefault().lookup(PreviewController.class);
                PreviewModel pModel = previewController.getModel();
                //Add new tabs
                for (PreviewUI pui : Lookup.getDefault().lookupAll(PreviewUI.class)) {
                    pui.setup(pModel);
                    JPanel pluginPanel = pui.getPanel();
                    if (UIUtils.isAquaLookAndFeel()) {
                        pluginPanel.setBackground(UIManager.getColor("NbExplorerView.background"));
                    }
                    if (pui.getIcon() != null) {
                        tabbedPane.addTab(pui.getPanelTitle(), pui.getIcon(), pluginPanel);
                    } else {
                        tabbedPane.addTab(pui.getPanelTitle(), pluginPanel);
                    }
                }
            }
        }
    }
    
    public void unsetup() {
    }

    /**
     * Returns the graph visibility ratio set in the visibilityRatioSpinner
     * component.
     *
     * @return the graph visibility ratio
     */
    public float getVisibilityRatio() {
        float value = (Integer) ratioSlider.getValue();
        
        if (value < 0) {
            value = 0;
        } else if (value > 100) {
            value = 100;
        }
        
        return value / 100;
    }

    /**
     * Enables the refresh button.
     *
     * @see PreviewUIController#enableRefresh()
     */
    public void enableRefreshButton() {
        refreshButton.setEnabled(true);
        labelRatio.setEnabled(true);
        ratioLabel.setEnabled(true);
        ratioSlider.setEnabled(true);
        labelExport.setEnabled(true);
        svgExportButton.setEnabled(true);
    }

    /**
     * Disables the refresh button.
     *
     * @see PreviewUIController#disableRefresh()
     */
    public void disableRefreshButton() {
        refreshButton.setEnabled(false);
        labelRatio.setEnabled(false);
        ratioLabel.setEnabled(false);
        ratioSlider.setEnabled(false);
        labelExport.setEnabled(false);
        svgExportButton.setEnabled(false);
    }
    
    private boolean isDefaultPreset(PreviewPreset preset) {
        int i = 0;
        for (i = 0; i < presetComboBox.getItemCount(); i++) {
            if (presetComboBox.getModel().getElementAt(i).equals(preset)) {
                break;
            }
        }
        return i < defaultPresetLimit;
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {
        java.awt.GridBagConstraints gridBagConstraints;

        mainPanel = new javax.swing.JPanel();
        presetPanel = new javax.swing.JPanel();
        presetComboBox = new javax.swing.JComboBox();
        presetToolbar = new javax.swing.JToolBar();
        box = new javax.swing.JLabel();
        saveButton = new javax.swing.JButton();
        labelPreset = new javax.swing.JLabel();
        refreshButton = new javax.swing.JButton();
        propertiesPanel = new javax.swing.JPanel();
        labelRatio = new javax.swing.JLabel();
        ratioLabel = new javax.swing.JLabel();
        ratioSlider = new javax.swing.JSlider();
        southToolbar = new javax.swing.JToolBar();
        labelExport = new javax.swing.JLabel();
        svgExportButton = new javax.swing.JButton();

        setLayout(new java.awt.BorderLayout());

        mainPanel.setLayout(new java.awt.GridBagLayout());

        presetPanel.setOpaque(false);
        presetPanel.setLayout(new java.awt.GridBagLayout());

        presetComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "---" }));
        presetComboBox.setEnabled(false);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        gridBagConstraints.gridwidth = 2;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        gridBagConstraints.ipady = 5;
        gridBagConstraints.weightx = 2.0;
        gridBagConstraints.insets = new java.awt.Insets(5, 5, 10, 5);
        presetPanel.add(presetComboBox, gridBagConstraints);

        presetToolbar.setBorder(null);
        presetToolbar.setFloatable(false);
        presetToolbar.setRollover(true);
        presetToolbar.setOpaque(false);

        org.openide.awt.Mnemonics.setLocalizedText(box, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.box.text")); // NOI18N
        box.setMaximumSize(new java.awt.Dimension(32767, 32767));
        presetToolbar.add(box);

        saveButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/org/gephi/desktop/preview/resources/save.png"))); // NOI18N
        org.openide.awt.Mnemonics.setLocalizedText(saveButton, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.saveButton.text")); // NOI18N
        saveButton.setToolTipText(org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.saveButton.toolTipText")); // NOI18N
        saveButton.setEnabled(false);
        saveButton.setFocusable(false);
        saveButton.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
        saveButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveButtonActionPerformed(evt);
            }
        });
        presetToolbar.add(saveButton);

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 1;
        gridBagConstraints.gridy = 0;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        gridBagConstraints.insets = new java.awt.Insets(3, 5, 0, 5);
        presetPanel.add(presetToolbar, gridBagConstraints);

        labelPreset.setIcon(new javax.swing.ImageIcon(getClass().getResource("/org/gephi/desktop/preview/resources/preset.png"))); // NOI18N
        org.openide.awt.Mnemonics.setLocalizedText(labelPreset, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.labelPreset.text")); // NOI18N
        labelPreset.setEnabled(false);
        labelPreset.setHorizontalTextPosition(javax.swing.SwingConstants.RIGHT);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 0;
        gridBagConstraints.insets = new java.awt.Insets(3, 5, 0, 0);
        presetPanel.add(labelPreset, gridBagConstraints);

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 0;
        gridBagConstraints.gridwidth = 3;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        mainPanel.add(presetPanel, gridBagConstraints);

        refreshButton.setIcon(new javax.swing.ImageIcon(getClass().getResource("/org/gephi/desktop/preview/resources/refresh.png"))); // NOI18N
        org.openide.awt.Mnemonics.setLocalizedText(refreshButton, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.refreshButton.text")); // NOI18N
        refreshButton.setEnabled(false);
        refreshButton.setMargin(new java.awt.Insets(10, 14, 10, 14));
        refreshButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                refreshButtonActionPerformed(evt);
            }
        });
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 2;
        gridBagConstraints.gridy = 2;
        gridBagConstraints.gridheight = 3;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.EAST;
        gridBagConstraints.insets = new java.awt.Insets(7, 5, 0, 10);
        mainPanel.add(refreshButton, gridBagConstraints);

        propertiesPanel.setOpaque(false);
        propertiesPanel.setLayout(new java.awt.BorderLayout());
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        gridBagConstraints.gridwidth = 3;
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.weighty = 1.0;
        mainPanel.add(propertiesPanel, gridBagConstraints);

        org.openide.awt.Mnemonics.setLocalizedText(labelRatio, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.labelRatio.text")); // NOI18N
        labelRatio.setEnabled(false);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 2;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
        gridBagConstraints.insets = new java.awt.Insets(5, 7, 3, 5);
        mainPanel.add(labelRatio, gridBagConstraints);

        org.openide.awt.Mnemonics.setLocalizedText(ratioLabel, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.ratioLabel.text")); // NOI18N
        ratioLabel.setEnabled(false);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 1;
        gridBagConstraints.gridy = 2;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.insets = new java.awt.Insets(5, 0, 3, 0);
        mainPanel.add(ratioLabel, gridBagConstraints);

        ratioSlider.setEnabled(false);
        ratioSlider.setPreferredSize(new java.awt.Dimension(120, 23));
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 3;
        gridBagConstraints.gridwidth = 2;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.EAST;
        gridBagConstraints.insets = new java.awt.Insets(0, 3, 5, 20);
        mainPanel.add(ratioSlider, gridBagConstraints);

        southToolbar.setFloatable(false);
        southToolbar.setRollover(true);
        southToolbar.setOpaque(false);

        labelExport.setFont(new java.awt.Font("Tahoma", 0, 10));
        org.openide.awt.Mnemonics.setLocalizedText(labelExport, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.labelExport.text")); // NOI18N
        labelExport.setEnabled(false);
        southToolbar.add(labelExport);

        org.openide.awt.Mnemonics.setLocalizedText(svgExportButton, org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.svgExportButton.text")); // NOI18N
        svgExportButton.setToolTipText(org.openide.util.NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.svgExportButton.toolTipText")); // NOI18N
        svgExportButton.setEnabled(false);
        svgExportButton.setFocusable(false);
        svgExportButton.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
        svgExportButton.setMargin(new java.awt.Insets(2, 8, 2, 8));
        svgExportButton.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
        southToolbar.add(svgExportButton);

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 4;
        gridBagConstraints.gridwidth = 3;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.insets = new java.awt.Insets(0, 5, 0, 5);
        mainPanel.add(southToolbar, gridBagConstraints);

        add(mainPanel, java.awt.BorderLayout.CENTER);
    }// </editor-fold>//GEN-END:initComponents

    private void refreshButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_refreshButtonActionPerformed
        Lookup.getDefault().lookup(PreviewUIController.class).refreshPreview();
}//GEN-LAST:event_refreshButtonActionPerformed
    
    private void saveButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_saveButtonActionPerformed
        PreviewUIController previewController = Lookup.getDefault().lookup(PreviewUIController.class);
        PreviewPreset preset = previewController.getModel().getCurrentPreset();
        boolean saved = false;
        if (isDefaultPreset(preset)) {
            NotifyDescriptor.InputLine question = new NotifyDescriptor.InputLine(
                    NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.savePreset.input"),
                    NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.savePreset.input.title"));
            if (DialogDisplayer.getDefault().notify(question) == NotifyDescriptor.OK_OPTION) {
                String input = question.getInputText();
                if (input != null && !input.isEmpty()) {
                    previewController.savePreset(input);
                    saved = true;
                    StatusDisplayer.getDefault().setStatusText(NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.savePreset.status", input));
                }
            }
        } else {
            previewController.savePreset(preset.getName());
            saved = true;
            StatusDisplayer.getDefault().setStatusText(NbBundle.getMessage(PreviewSettingsTopComponent.class, "PreviewSettingsTopComponent.savePreset.status", preset.getName()));
        }
        
        if (saved) {
            //refresh combo
            DefaultComboBoxModel comboBoxModel = new DefaultComboBoxModel();
            defaultPresetLimit = 0;
            for (PreviewPreset p : previewController.getDefaultPresets()) {
                comboBoxModel.addElement(p);
                defaultPresetLimit++;
            }
            PreviewPreset[] userPresets = previewController.getUserPresets();
            if (userPresets.length > 0) {
                comboBoxModel.addElement(NO_SELECTION);
                for (PreviewPreset p : userPresets) {
                    comboBoxModel.addElement(p);
                }
            }
            comboBoxModel.setSelectedItem(previewController.getModel().getCurrentPreset());
            presetComboBox.setModel(comboBoxModel);
        }
    }//GEN-LAST:event_saveButtonActionPerformed
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel box;
    private javax.swing.JLabel labelExport;
    private javax.swing.JLabel labelPreset;
    private javax.swing.JLabel labelRatio;
    private javax.swing.JPanel mainPanel;
    private javax.swing.JComboBox presetComboBox;
    private javax.swing.JPanel presetPanel;
    private javax.swing.JToolBar presetToolbar;
    private javax.swing.JPanel propertiesPanel;
    private javax.swing.JLabel ratioLabel;
    private javax.swing.JSlider ratioSlider;
    private javax.swing.JButton refreshButton;
    private javax.swing.JButton saveButton;
    private javax.swing.JToolBar southToolbar;
    private javax.swing.JButton svgExportButton;
    // End of variables declaration//GEN-END:variables

    /**
     * Gets default instance. Do not use directly: reserved for *.settings files only,
     * i.e. deserialization routines; otherwise you could get a non-deserialized instance.
     * To obtain the singleton instance, use {@link #findInstance}.
     */
    public static synchronized PreviewSettingsTopComponent getDefault() {
        if (instance == null) {
            instance = new PreviewSettingsTopComponent();
        }
        return instance;
    }

    /**
     * Obtain the PreviewSettingsTopComponent instance. Never call {@link #getDefault} directly!
     */
    public static synchronized PreviewSettingsTopComponent findInstance() {
        TopComponent win = WindowManager.getDefault().findTopComponent(PREFERRED_ID);
        if (win == null) {
            Logger.getLogger(PreviewSettingsTopComponent.class.getName()).warning(
                    "Cannot find " + PREFERRED_ID + " component. It will not be located properly in the window system.");
            return getDefault();
        }
        if (win instanceof PreviewSettingsTopComponent) {
            return (PreviewSettingsTopComponent) win;
        }
        Logger.getLogger(PreviewSettingsTopComponent.class.getName()).warning(
                "There seem to be multiple components with the '" + PREFERRED_ID
                + "' ID. That is a potential source of errors and unexpected behavior.");
        return getDefault();
    }
    
    @Override
    public int getPersistenceType() {
        return TopComponent.PERSISTENCE_ALWAYS;
    }
    
    @Override
    public void componentOpened() {
        // TODO add custom code on component opening
    }
    
    @Override
    public void componentClosed() {
        // TODO add custom code on component closing
    }

    /** replaces this in object stream */
    @Override
    public Object writeReplace() {
        return new ResolvableHelper();
    }
    
    @Override
    protected String preferredID() {
        return PREFERRED_ID;
    }
    
    final static class ResolvableHelper implements Serializable {
        
        private static final long serialVersionUID = 1L;
        
        public Object readResolve() {
            return PreviewSettingsTopComponent.getDefault();
        }
    }
}