core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/dialogs/OpenMethodSelectionDialog2.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.dialogs;

import org.eclipse.dltk.core.search.IDLTKSearchScope;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.dltk.ui.IDLTKUILanguageToolkit;
import org.eclipse.jface.dialogs.DialogSettings;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.operation.IRunnableContext;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;

public class OpenMethodSelectionDialog2 extends MethodSelectionDialog2 {

	private IDialogSettings fSettings;
	private Point fLocation;
	private Point fSize;

	private static final String DIALOG_SETTINGS = "org.eclipse.jdt.internal.ui.dialogs.OpenMethodSelectionDialog2"; //$NON-NLS-1$
	private static final String WIDTH = "width"; //$NON-NLS-1$
	private static final String HEIGHT = "height"; //$NON-NLS-1$

	public OpenMethodSelectionDialog2(Shell parent, boolean multi, IRunnableContext context, IDLTKSearchScope scope, int elementKinds, IDLTKUILanguageToolkit toolkit) {
		super(parent, multi, context, scope, elementKinds, toolkit);
		IDialogSettings settings = DLTKUIPlugin.getDefault().getDialogSettings();
		fSettings = settings.getSection(DIALOG_SETTINGS);
		if (fSettings == null) {
			fSettings = new DialogSettings(DIALOG_SETTINGS);
			settings.addSection(fSettings);
			fSettings.put(WIDTH, 480);
			fSettings.put(HEIGHT, 320);
		}
	}

	@Override
	protected void configureShell(Shell newShell) {
		super.configureShell(newShell);
		// TODO : set help context
		// PlatformUI.getWorkbench().getHelpSystem().setHelp(newShell, IJavaHelpContextIds.OPEN_TYPE_DIALOG);
	}

	@Override
	protected Point getInitialSize() {
		Point result = super.getInitialSize();
		if (fSize != null) {
			result.x = Math.max(result.x, fSize.x);
			result.y = Math.max(result.y, fSize.y);
			Rectangle display = getShell().getDisplay().getClientArea();
			result.x = Math.min(result.x, display.width);
			result.y = Math.min(result.y, display.height);
		}
		return result;
	}

	@Override
	protected Point getInitialLocation(Point initialSize) {
		Point result = super.getInitialLocation(initialSize);
		if (fLocation != null) {
			result.x = fLocation.x;
			result.y = fLocation.y;
			Rectangle display = getShell().getDisplay().getClientArea();
			int xe = result.x + initialSize.x;
			if (xe > display.width) {
				result.x -= xe - display.width;
			}
			int ye = result.y + initialSize.y;
			if (ye > display.height) {
				result.y -= ye - display.height;
			}
		}
		return result;
	}

	@Override
	protected Control createDialogArea(Composite parent) {
		readSettings();
		return super.createDialogArea(parent);
	}

	@Override
	public boolean close() {
		writeSettings();
		return super.close();
	}

	/**
	 * Initializes itself from the dialog settings with the same state
	 * as at the previous invocation.
	 */
	private void readSettings() {
		try {
			int x = fSettings.getInt("x"); //$NON-NLS-1$
			int y = fSettings.getInt("y"); //$NON-NLS-1$
			fLocation = new Point(x, y);
		} catch (NumberFormatException e) {
			fLocation = null;
		}
		try {
			int width = fSettings.getInt("width"); //$NON-NLS-1$
			int height = fSettings.getInt("height"); //$NON-NLS-1$
			fSize = new Point(width, height);

		} catch (NumberFormatException e) {
			fSize = null;
		}
	}

	/**
	 * Stores it current configuration in the dialog store.
	 */
	private void writeSettings() {
		Point location = getShell().getLocation();
		fSettings.put("x", location.x); //$NON-NLS-1$
		fSettings.put("y", location.y); //$NON-NLS-1$

		Point size = getShell().getSize();
		fSettings.put("width", size.x); //$NON-NLS-1$
		fSettings.put("height", size.y); //$NON-NLS-1$
	}
}