gov.redhawk.internal.ui.preferences.OverridableDoubleFieldEditor.java Source code

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Here is the source code for gov.redhawk.internal.ui.preferences.OverridableDoubleFieldEditor.java

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/*******************************************************************************
 * This file is protected by Copyright. 
 * Please refer to the COPYRIGHT file distributed with this source distribution.
 *
 * This file is part of REDHAWK IDE.
 *
 * 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
 *******************************************************************************/
package gov.redhawk.internal.ui.preferences;

import org.eclipse.jface.resource.ColorRegistry;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;

/**
 * 
 */
public class OverridableDoubleFieldEditor extends DoubleFieldEditor {

    private String overridePref;
    private boolean override;
    private ModifyListener listener = new ModifyListener() {

        @Override
        public void modifyText(ModifyEvent e) {
            if (getTextControl().getText().isEmpty() || "AUTO".equalsIgnoreCase(getTextControl().getText())) {
                override = false;
            } else {
                override = true;
            }
            updateTextFieldColor();
        }
    };
    private Color defaultForeground;
    private Color disabledForeground;

    public OverridableDoubleFieldEditor(String name, String nameOverride, String labelText, Composite parent) {
        super(name, labelText, parent);
        this.overridePref = nameOverride;
        final Text control = getTextControl();
        control.addModifyListener(listener);
        control.addFocusListener(new FocusListener() {

            @Override
            public void focusLost(FocusEvent e) {
                if (!override) {
                    control.setText("AUTO");
                }
            }

            @Override
            public void focusGained(FocusEvent e) {
                if (!override) {
                    control.setText("");
                }
            }
        });
        setEmptyStringAllowed(true);
        initColors(control);
        updateTextFieldColor();
    }

    private void initColors(Text retVal) {
        defaultForeground = retVal.getForeground();
        ColorRegistry colorRegistry = JFaceResources.getColorRegistry();
        disabledForeground = colorRegistry.get("DarkGray");
        if (disabledForeground == null) {
            if (!colorRegistry.hasValueFor("DarkGray")) {
                colorRegistry.put("DarkGray", new RGB(0x69, 0x69, 0x69));
            }
            disabledForeground = colorRegistry.get("DarkGray");
        }
    }

    @Override
    protected boolean checkState() {
        Text text = getTextControl();

        if (text == null) {
            return false;
        }

        if ("AUTO".equals(text.getText())) {
            return true;
        } else if ("".equals(text.getText())) {
            return true;
        }
        return super.checkState();
    }

    @Override
    protected void doLoad() {
        this.override = getPreferenceStore().getBoolean(overridePref);
        Text text = getTextControl();
        if (text != null) {
            if (override) {
                double value = getPreferenceStore().getDouble(getPreferenceName());
                text.setText("" + value); //$NON-NLS-1$
                oldValue = "" + value; //$NON-NLS-1$
            } else {
                text.setText("AUTO");
                oldValue = "AUTO"; //$NON-NLS-1$
            }
        }
    }

    private void updateTextFieldColor() {
        Text control = getTextControl();
        if (control == null) {
            return;
        }
        if (!this.override) {
            getTextControl().setForeground(disabledForeground);
        } else {
            getTextControl().setForeground(defaultForeground);
        }
    }

    @Override
    protected void doLoadDefault() {
        this.override = getPreferenceStore().getDefaultBoolean(overridePref);
        Text text = getTextControl();
        if (text != null) {
            if (override) {
                double value = getPreferenceStore().getDefaultDouble(getPreferenceName());
                text.setText("" + value); //$NON-NLS-1$
            } else {
                text.setText("AUTO"); //$NON-NLS-1$
            }
        }
        valueChanged();
    }

    @Override
    protected void doStore() {
        Text text = getTextControl();
        if (text != null) {
            if (override) {
                Double i = new Double(text.getText());
                getPreferenceStore().setValue(getPreferenceName(), i.doubleValue());
                getPreferenceStore().setValue(overridePref, true);
            } else {
                getPreferenceStore().setValue(overridePref, false);
                getPreferenceStore().setToDefault(getPreferenceName());
            }
        }
    }
}