ecommons.waltable/org.eclipse.statet.ecommons.waltable.core/src/org/eclipse/statet/ecommons/waltable/style/editor/AbstractStyleEditorDialog.java

/*=============================================================================#
 # Copyright (c) 2012, 2021 Original NatTable authors and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0
 # 
 # Contributors:
 #     Original NatTable authors and others - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.ecommons.waltable.style.editor;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Dialog;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

import org.eclipse.statet.ecommons.waltable.Messages;
import org.eclipse.statet.ecommons.waltable.util.GUIHelper;


public abstract class AbstractStyleEditorDialog extends Dialog {

	private boolean cancelPressed= false;
	private Point location;

	public AbstractStyleEditorDialog(final Shell parent) {
		super(parent, SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL);
	}

	public void setLocation(final Point location) {
        this.location= new Point(location.x, location.y);
	}
	
    private void setLocation(final Shell shell) {
        if (this.location != null) {
            if (this.location.x < getParent().getDisplay().getBounds().x) { 
                this.location.x= getParent().getDisplay().getBounds().x;
            } else if (this.location.x + shell.getBounds().width > getParent().getDisplay().getBounds().x + getParent().getDisplay().getBounds().width) {
                this.location.x= getParent().getDisplay().getBounds().x + getParent().getDisplay().getBounds().width - shell.getBounds().width;
            }
            if (this.location.y + shell.getBounds().height > getParent().getDisplay().getBounds().y + getParent().getDisplay().getBounds().height) {
                this.location.y= getParent().getDisplay().getBounds().y + getParent().getDisplay().getBounds().height - shell.getBounds().height;
            }
            shell.setLocation(this.location);
        }
    }

	/**
	 * Create all widgets to be displayed in the editor
	 */
	protected abstract void initComponents(Shell shell);

	/**
	 * Initialize and display the SWT shell. This is a blocking call.
	 */
	public void open() {
		final Shell shell= new Shell(getParent(), getStyle());
		shell.setImage(GUIHelper.getImage("preferences")); //$NON-NLS-1$
		shell.setText(getText());

		initComponents(shell);
		createButtons(shell);

		shell.pack();
		setLocation(shell);
		shell.open();
		final Display display= shell.getDisplay();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	/**
	 * Create OK, Reset and Cancel buttons
	 */
	protected void createButtons(final Shell shell) {
		final Composite buttonPanel= new Composite(shell, SWT.NONE);

		final GridLayout gridLayout= new GridLayout();
		gridLayout.numColumns= 3;
		gridLayout.marginLeft= 65;
		buttonPanel.setLayout(gridLayout);

		final GridData gridLayoutData= new GridData();
		gridLayoutData.horizontalAlignment= GridData.FILL_HORIZONTAL;
		buttonPanel.setLayoutData(gridLayoutData);

		final Button okButton= new Button(buttonPanel, SWT.PUSH);
		okButton.setText(Messages.getString("AbstractStyleEditorDialog.okButton")); //$NON-NLS-1$
		okButton.setLayoutData(new GridData(70, 25));
		okButton.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(final SelectionEvent e) {
				doFormOK(shell);
			}
		});

		final Button clearButton= new Button(buttonPanel, SWT.PUSH);
		clearButton.setText(Messages.getString("AbstractStyleEditorDialog.clearButton")); //$NON-NLS-1$
		clearButton.setToolTipText(Messages.getString("AbstractStyleEditorDialog.clearButtonTooltip")); //$NON-NLS-1$
		clearButton.setLayoutData(new GridData(80, 25));
		clearButton.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(final SelectionEvent e) {
				doFormClear(shell);
			}
		});

		final Button cancelButton= new Button(buttonPanel, SWT.NONE);
		cancelButton.setText(Messages.getString("AbstractStyleEditorDialog.cancelButton")); //$NON-NLS-1$
		cancelButton.setLayoutData(new GridData(80, 25));
		cancelButton.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(final SelectionEvent e) {
				doFormCancel(shell);
			}
		});

		shell.setDefaultButton(okButton);
	}

	/**
	 * Respond to the OK button press. Read new state from the form.
	 */
	protected abstract void doFormOK(Shell shell);

	protected void doFormCancel(final Shell shell) {
		this.cancelPressed= true;
		shell.dispose();
	}

	protected void doFormClear(final Shell shell) {
		shell.dispose();
	}

	public boolean isCancelPressed(){
		return this.cancelPressed;
	}
}