net.certiv.fluentmark.tables.AbstractCellCursor.java Source code

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Here is the source code for net.certiv.fluentmark.tables.AbstractCellCursor.java

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/*******************************************************************************
 * Copyright (c) 2016 - 2017 Certiv Analytics and others.
 * 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 net.certiv.fluentmark.tables;

import java.util.ArrayList;

import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

/**
 * @since 3.3
 *
 */
public abstract class AbstractCellCursor extends Canvas {

    private ViewerCell[] cells = new ViewerCell[0];
    private ColumnViewer viewer;
    private int activationTime = 0;
    private boolean inFocusRequest = false;

    /**
     * @param viewer
     * @param style
     */
    public AbstractCellCursor(ColumnViewer viewer, int style) {
        super((Composite) viewer.getControl(), style);
        this.viewer = viewer;

        Listener listener = createListener();
        int[] eventsToListen = { SWT.Paint, SWT.KeyDown, SWT.MouseDown, SWT.MouseDoubleClick };

        for (int event : eventsToListen) {
            addListener(event, listener);
        }
        getParent().addListener(SWT.FocusIn, listener);
    }

    private Listener createListener() {
        return new Listener() {

            @Override
            public void handleEvent(Event event) {
                switch (event.type) {
                case SWT.Paint:
                    paint(event);
                    break;

                case SWT.KeyDown:
                    getParent().notifyListeners(SWT.KeyDown, event);
                    ArrayList<Object> list = new ArrayList<>();
                    for (ViewerCell cell : cells) {
                        list.add(cell.getElement());
                    }
                    AbstractCellCursor.this.viewer.setSelection(new StructuredSelection(list));
                    break;

                case SWT.MouseDown:
                    if (event.time < activationTime) {
                        Event cEvent = copyEvent(event);
                        cEvent.type = SWT.MouseDoubleClick;
                        getParent().notifyListeners(SWT.MouseDoubleClick, cEvent);
                    } else {
                        getParent().notifyListeners(SWT.MouseDown, copyEvent(event));
                    }
                    break;

                case SWT.MouseDoubleClick:
                    getParent().notifyListeners(SWT.MouseDoubleClick, copyEvent(event));
                    break;

                case SWT.FocusIn:
                    if (isVisible()) {
                        inFocusRequest = true;
                        if (!inFocusRequest) {
                            forceFocus();
                        }
                        inFocusRequest = false;
                    }

                default:
                    break;
                }
            }
        };
    }

    /**
     * @param cell
     * @param eventTime
     */
    public void setSelection(ViewerCell cell, int eventTime) {
        this.cells = new ViewerCell[] { cell };
        setBounds(cell.getBounds());
        forceFocus();
        redraw();
        activationTime = eventTime + getDisplay().getDoubleClickTime();
    }

    /**
     * @return the cells who should be highlighted
     */
    protected ViewerCell[] getSelectedCells() {
        return cells;
    }

    private Event copyEvent(Event event) {
        Event cEvent = new Event();
        cEvent.button = event.button;
        cEvent.character = event.character;
        cEvent.count = event.count;
        cEvent.data = event.data;
        cEvent.detail = event.detail;
        cEvent.display = event.display;
        cEvent.doit = event.doit;
        cEvent.end = event.end;
        cEvent.gc = event.gc;
        cEvent.height = event.height;
        cEvent.index = event.index;
        cEvent.item = getSelectedCells()[0].getControl();
        cEvent.keyCode = event.keyCode;
        cEvent.start = event.start;
        cEvent.stateMask = event.stateMask;
        cEvent.text = event.text;
        cEvent.time = event.time;
        cEvent.type = event.type;
        cEvent.widget = event.widget;
        cEvent.width = event.width;
        Point p = viewer.getControl().toControl(toDisplay(event.x, event.y));
        cEvent.x = p.x;
        cEvent.y = p.y;

        return cEvent;
    }

    /**
     * @param event
     */
    protected abstract void paint(Event event);
}