org.xtuml.bp.ui.sem.viewers.SEMFocusCellHighlighter.java Source code

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Here is the source code for org.xtuml.bp.ui.sem.viewers.SEMFocusCellHighlighter.java

Source

package org.xtuml.bp.ui.sem.viewers;
//========================================================================

// Licensed under the Apache License, Version 2.0 (the "License"); you may not 
// use this file except in compliance with the License.  You may obtain a copy 
// of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   See the 
// License for the specific language governing permissions and limitations under
// the License.
//======================================================================== 
//

import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.FocusCellOwnerDrawHighlighter;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.jface.viewers.ViewerRow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

public class SEMFocusCellHighlighter extends FocusCellOwnerDrawHighlighter {

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

    private void hookListener(final ColumnViewer viewer) {

        Listener listener = new Listener() {

            public void handleEvent(Event event) {
                if ((event.detail & SWT.SELECTED) > 0 || (event.detail & SWT.FocusOut) > 0) {
                    ViewerCell focusCell = getFocusCell();
                    if (focusCell != null) {
                        ViewerRow row = focusCell.getViewerRow();
                        ViewerCell cell = row.getCell(event.index);
                        removeSelectionInformation(event, cell);
                    }
                }
            }

        };
        viewer.getControl().addListener(SWT.EraseItem, listener);
    }

    private void removeSelectionInformation(Event event, ViewerCell cell) {
        GC gc = event.gc;
        gc.setBackground(cell.getViewerRow().getBackground(cell.getColumnIndex()));
        gc.setForeground(cell.getViewerRow().getForeground(cell.getColumnIndex()));
        event.detail &= ~SWT.SELECTED;
    }
}