core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/wizards/dialogfields/StringDialogField.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.wizards.dialogfields;

import org.eclipse.dltk.compiler.util.Util;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

/**
 * Dialog field containing a label and a text control.
 */
public class StringDialogField extends DialogField {

	private String fText;
	private String fMessage;
	private Text fTextControl;
	private ModifyListener fModifyListener;

	// private IContentAssistProcessor fContentAssistProcessor;

	public StringDialogField() {
		super();
		if (DLTKCore.DEBUG) {
			System.err.println("StringDialogField: Add content assist here."); //$NON-NLS-1$
		}
		fText = ""; //$NON-NLS-1$
		fMessage = Util.EMPTY_STRING;
	}

	public void setContentAssistProcessor(IContentAssistProcessor processor) {
		// fContentAssistProcessor= processor;
		// if (fContentAssistProcessor != null && isOkToUse(fTextControl)) {
		// ControlContentAssistHelper.createTextContentAssistant(fTextControl,
		// fContentAssistProcessor);
		// }
	}

	public IContentAssistProcessor getContentAssistProcessor() {
		return null;// fContentAssistProcessor;
	}

	// ------- layout helpers

	@Override
	public Control[] doFillIntoGrid(Composite parent, int nColumns) {
		assertEnoughColumns(nColumns);

		Label label = getLabelControl(parent);
		label.setLayoutData(gridDataForLabel(1));
		Text text = getTextControl(parent);
		text.setLayoutData(gridDataForText(nColumns - 1));

		return new Control[] { label, text };
	}

	@Override
	public int getNumberOfControls() {
		return 2;
	}

	public static GridData gridDataForText(int span) {
		GridData gd = new GridData();
		gd.horizontalAlignment = GridData.FILL;
		gd.grabExcessHorizontalSpace = false;
		gd.horizontalSpan = span;
		return gd;
	}

	// ------- focus methods

	@Override
	public boolean setFocus() {
		if (isOkToUse(fTextControl)) {
			fTextControl.setFocus();
			fTextControl.setSelection(0, fTextControl.getText().length());
		}
		return true;
	}

	public Text getTextControl() {
		return getTextControl(null);
	}

	// ------- ui creation

	/**
	 * Creates or returns the created text control.
	 *
	 * @param parent
	 *            The parent composite or <code>null</code> when the widget has
	 *            already been created.
	 */
	public Text getTextControl(Composite parent) {
		if (fTextControl == null) {
			assertCompositeNotNull(parent);
			fModifyListener = e -> doModifyText(e);

			fTextControl = new Text(parent, SWT.SINGLE | SWT.BORDER);
			// moved up due to 1GEUNW2
			fTextControl.setText(fText);
			fTextControl.setMessage(fMessage);
			fTextControl.setFont(parent.getFont());
			fTextControl.addModifyListener(fModifyListener);

			fTextControl.setEnabled(isEnabled());
			// if (fContentAssistProcessor != null) {
			// ControlContentAssistHelper.createTextContentAssistant(fTextControl,
			// fContentAssistProcessor);
			// }
		}
		return fTextControl;
	}

	private void doModifyText(ModifyEvent e) {
		if (isOkToUse(fTextControl)) {
			fText = fTextControl.getText();
		}
		dialogFieldChanged();
	}

	// ------ enable / disable management

	@Override
	protected void updateEnableState() {
		super.updateEnableState();
		if (isOkToUse(fTextControl)) {
			fTextControl.setEnabled(isEnabled());
		}
	}

	// ------ text access

	/**
	 * Gets the text. Can not be <code>null</code>
	 */
	public String getText() {
		return fText;
	}

	/**
	 * Sets the text. Triggers a dialog-changed event.
	 */
	public void setText(String text) {
		fText = text;
		if (isOkToUse(fTextControl)) {
			fTextControl.setText(text);
		} else {
			dialogFieldChanged();
		}
	}

	public String getMessage() {
		return fMessage;
	}

	public void setMessage(String value) {
		fMessage = value;
		if (isOkToUse(fTextControl)) {
			fTextControl.setMessage(value);
		}
	}

	/**
	 * Sets the text without triggering a dialog-changed event.
	 */
	public void setTextWithoutUpdate(String text) {
		fText = text;
		if (isOkToUse(fTextControl)) {
			fTextControl.removeModifyListener(fModifyListener);
			fTextControl.setText(text);
			fTextControl.addModifyListener(fModifyListener);
		}
	}

	@Override
	public void refresh() {
		super.refresh();
		if (isOkToUse(fTextControl)) {
			setTextWithoutUpdate(fText);
			fTextControl.setMessage(fMessage);
		}
	}

}