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package org.netbeans.modules.examplemodule03;

import org.openide.ErrorManager;

import org.openide.util.HelpCtx;

import org.openide.util.NbBundle;

import org.openide.windows.TopComponent;

import org.openide.windows.WindowManager;

import java.awt.BorderLayout;

import javax.swing.JButton;

/**

 *

 * Example implementation of persistent TopComponent.

 *

 * @author  Marek Slama

 *

 */

class TestComponent00 extends TopComponent {

    static final long serialVersionUID = 6021472310161712674L;

    private static TestComponent00 component = null;

    private static final String TC_ID = "test03tc00";

    private JButton button;

    private boolean isGUICreated = false;

    private TestComponent00() {

        setName(NbBundle.getMessage(TestComponent00.class, "LBL_Tab_Title00"));

    }

    private void initGUI () {

        setLayout(new BorderLayout());

        button = new JButton(getName());

        add(button);

        isGUICreated = true;

    }

    protected void componentShowing () {

        if (!isGUICreated) {

            initGUI();

        }

    }

    protected String preferredID () {

        return TC_ID;

    }

    /* Singleton accessor. As TestComponent00 is persistent singleton this

     * accessor makes sure that TestComponent00 is deserialized by window system.

     * Uses known unique TopComponent ID "test03tc00" to get TestComponent00 instance

     * from window system. "test03tc00" is name of settings file defined in module layer.

     * For example ShowTestAction00 uses this method to create instance if necessary.

     */

    public static synchronized TestComponent00 findDefault() {

        if (component == null) {

            //If settings file is correctly defined call of WindowManager.findTopComponent() will

            //call TestComponent00.getDefault() and it will set static field component.

            TopComponent tc = WindowManager.getDefault().findTopComponent(TC_ID);

            if (tc != null) {

                if (!(tc instanceof TestComponent00)) {

                    //This should not happen. Possible only if some other module

                    //defines different settings file with the same name but different class.

                    //Incorrect settings file?

                    IllegalStateException exc = new IllegalStateException

                    ("Incorrect settings file. Unexpected class returned." // NOI18N

                    + " Expected:" + TestComponent00.class.getName() // NOI18N

                    + " Returned:" + tc.getClass().getName()); // NOI18N

                    ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, exc);

                    //Fallback to accessor reserved for window system.

                    TestComponent00.getDefault();

                }

            } else {

                //This should not happen when settings file is correctly defined in module layer.

                //TestComponent00 cannot be deserialized

                //Fallback to accessor reserved for window system.

                ErrorManager.getDefault().log(ErrorManager.WARNING,

                "Cannot deserialize TopComponent for tcID:'" + TC_ID + "'"); // NOI18N

                TestComponent00.getDefault();

            }

        }

        return component;

    }

    /* Singleton accessor reserved for window system ONLY. Used by window system to create

     * TestComponent00 instance from settings file when method is given. Use <code>findDefault</code>

     * to get correctly deserialized instance of TestComponent00. */

    public static synchronized TestComponent00 getDefault() {

        if (component == null) {

            component = new TestComponent00();

        }

        return component;

    }

    /** Overriden to explicitely set persistence type of TestComponent00

     * to PERSISTENCE_ALWAYS */

    public int getPersistenceType() {

        return TopComponent.PERSISTENCE_ALWAYS;

    }

    /** Resolve to singleton instance */

    public Object readResolve() throws java.io.ObjectStreamException {

        return TestComponent00.getDefault();

    }

    static void clearRef () {

        component = null;

    }

    public void requestFocus(){

        super.requestFocus();

        button.requestFocus();

    }

    public boolean requestFocusInWindow(){

        super.requestFocusInWindow();

        return button.requestFocusInWindow();

    }

}