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

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Here is the source code for net.certiv.fluentmark.tables.FocusBorderCellHighlighter.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 org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.FocusCellHighlighter;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.jface.viewers.ViewerRow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

public class FocusBorderCellHighlighter extends FocusCellHighlighter {

    public FocusBorderCellHighlighter(ColumnViewer viewer) {
        super(viewer);
        hookListener(viewer);
    }

    private void markFocusedCell(Event event, ViewerCell cell) {
        GC gc = event.gc;
        Rectangle rect = event.getBounds();
        gc.drawFocus(rect.x, rect.y, rect.width, rect.height);
        event.detail &= ~SWT.SELECTED;
    }

    private void removeSelectionInformation(Event event, ViewerCell cell) {
    }

    private void hookListener(final ColumnViewer viewer) {

        Listener listener = new Listener() {

            @Override
            public void handleEvent(Event event) {
                if ((event.detail & SWT.SELECTED) > 0) {
                    ViewerCell focusCell = getFocusCell();
                    ViewerRow row = focusCell.getViewerRow();

                    Assert.isNotNull(row,
                            "Internal structure invalid. Item without associated row is not possible."); //$NON-NLS-1$

                    ViewerCell cell = row.getCell(event.index);

                    if (focusCell == null || !cell.equals(focusCell)) {
                        removeSelectionInformation(event, cell);
                    } else {
                        markFocusedCell(event, cell);
                    }
                }
            }
        };
        viewer.getControl().addListener(SWT.EraseItem, listener);
    }

    /**
     * @param cell the cell which is colored
     * @return the color
     */
    protected Color getSelectedCellBackgroundColor(ViewerCell cell) {
        return null;
    }

    /**
     * @param cell the cell which is colored
     * @return the color
     */
    protected Color getSelectedCellForegroundColor(ViewerCell cell) {
        return null;
    }

    @Override
    protected void focusCellChanged(ViewerCell newCell, ViewerCell oldCell) {
        super.focusCellChanged(newCell, oldCell);

        // Redraw new area
        if (newCell != null) {
            Rectangle rect = newCell.getBounds();
            int x = newCell.getColumnIndex() == 0 ? 0 : rect.x;
            int width = newCell.getColumnIndex() == 0 ? rect.x + rect.width : rect.width;
            // 1 is a fix for Linux-GTK
            newCell.getControl().redraw(x, rect.y - 1, width, rect.height + 1, true);
        }

        if (oldCell != null) {
            Rectangle rect = oldCell.getBounds();
            int x = oldCell.getColumnIndex() == 0 ? 0 : rect.x;
            int width = oldCell.getColumnIndex() == 0 ? rect.x + rect.width : rect.width;
            // 1 is a fix for Linux-GTK
            oldCell.getControl().redraw(x, rect.y - 1, width, rect.height + 1, true);
        }
    }
}