Attachment 197612 Details for Bug 268135 – FocusCellHighlighter that can handle multiselection and keyboard navigation (HACK!)

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FocusCellHighlighter that can handle multiselection and keyboard navigation (HACK!)

FocusCellOwnerDrawHighlighterForMultiselection.java (text/plain), 6.98 KB, created by Dominik Kaspar

on 2011-06-08 11:06:40 EDT

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Description:

Filename:

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Creator: Dominik Kaspar

Created: 2011-06-08 11:06:40 EDT

Size: 6.98 KB

patch

obsolete

>package com.qnamic.ui.base.table;
>
>import java.lang.reflect.Method;
>
>import org.apache.log4j.Logger;
>import org.eclipse.core.runtime.Assert;
>import org.eclipse.jface.viewers.ColumnViewer;
>import org.eclipse.jface.viewers.FocusCellHighlighter;
>import org.eclipse.jface.viewers.FocusCellOwnerDrawHighlighter;
>import org.eclipse.jface.viewers.TreeViewerFocusCellManager;
>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;
>import org.eclipse.swt.widgets.Widget;
>
>/**
> * Hack for solving the jface Bug 268135 (https://bugs.eclipse.org/bugs/show_bug.cgi?id=268135) [Viewers] [CellEditors]
> * Table with SWT.MULTI and TableViewerEditor problem. 
> * 
> * @see FocusCellOwnerDrawHighlighter
> */
>public class FocusCellOwnerDrawHighlighterForMultiselection extends FocusCellHighlighter {
>    
>    private static final Logger LOGGER = Logger.getLogger(FocusCellOwnerDrawHighlighterForMultiselection.class);
>    
>    /**
>     * Create a new instance which can be passed to a {@link TreeViewerFocusCellManager}
>     * @param viewer the viewer
>     */
>    public FocusCellOwnerDrawHighlighterForMultiselection(ColumnViewer viewer) {
>        super(viewer);
>        hookListener(viewer);
>    }
>
>    private void markFocusedCell(Event event, ViewerCell cell) {
>        Color background = (cell.getControl().isFocusControl()) ? getSelectedCellBackgroundColor(cell)
>                : getSelectedCellBackgroundColorNoFocus(cell);
>        Color foreground = (cell.getControl().isFocusControl()) ? getSelectedCellForegroundColor(cell)
>                : getSelectedCellForegroundColorNoFocus(cell);
>
>        if (foreground != null || background != null || onlyTextHighlighting(cell)) {
>            GC gc = event.gc;
>
>            if (background == null) {
>                background = cell.getItem().getDisplay().getSystemColor(SWT.COLOR_LIST_SELECTION);
>            }
>
>            if (foreground == null) {
>                foreground = cell.getItem().getDisplay().getSystemColor(SWT.COLOR_LIST_SELECTION_TEXT);
>            }
>
>            gc.setBackground(background);
>            gc.setForeground(foreground);
>
>            if (onlyTextHighlighting(cell)) {
>                Rectangle area = event.getBounds();
>                Rectangle rect = cell.getTextBounds();
>                if (rect != null) {
>                    area.x = rect.x;
>                }
>                gc.fillRectangle(area);
>            } else {
>                gc.fillRectangle(event.getBounds());
>            }
>
>            event.detail &= ~SWT.SELECTED;
>        }
>    }
> 
>    private void hookListener(final ColumnViewer viewer) {
>
>        Listener listener = new Listener() {
>
>            public void handleEvent(Event event) {
>                if ((event.detail & SWT.SELECTED) > 0) {
>                    ViewerCell focusCell = getFocusCell();
>
>                    try {
>                        Method m = viewer.getClass().getDeclaredMethod("getViewerRowFromItem", Widget.class);
>                        boolean access = m.isAccessible();
>                        if (!access) {
>                            m.setAccessible(true);
>                        }
>                        ViewerRow row = (ViewerRow) m.invoke(viewer, event.item);
>                        m.setAccessible(access);
>                        
>                        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)) {
>                            markFocusedCell(event, cell);
>                        }
>                    } catch (Exception e) {
>                        LOGGER.error(e.getLocalizedMessage(), e);
>                    }
>
>                }
>            }
>
>        };
>        viewer.getControl().addListener(SWT.EraseItem, listener);
>    }
>  
>    /**
>     * The color to use when rendering the background of the selected cell when the control has the input focus
>     * @param cell the cell which is colored
>     * @return the color or <code>null</code> to use the default
>     */
>    protected Color getSelectedCellBackgroundColor(ViewerCell cell) {
>        return cell.getItem().getDisplay().getSystemColor(SWT.COLOR_LIST_SELECTION);
>    }
>
>    /**
>     * The color to use when rendering the foreground (=text) of the selected cell when the control has the input focus
>     * @param cell the cell which is colored
>     * @return the color or <code>null</code> to use the default
>     */
>    protected Color getSelectedCellForegroundColor(ViewerCell cell) {
>        return null;
>    }
>
>    /**
>     * The color to use when rendering the foreground (=text) of the selected cell when the control has <b>no</b> input
>     * focus
>     * @param cell the cell which is colored
>     * @return the color or <code>null</code> to use the same used when control has focus
>     * @since 3.4
>     */
>    protected Color getSelectedCellForegroundColorNoFocus(ViewerCell cell) {
>        return null;
>    }
>
>    /**
>     * The color to use when rendering the background of the selected cell when the control has <b>no</b> input focus
>     * @param cell the cell which is colored
>     * @return the color or <code>null</code> to use the same used when control has focus
>     * @since 3.4
>     */
>    protected Color getSelectedCellBackgroundColorNoFocus(ViewerCell cell) {
>        return null;
>    }
>
>    /**
>     * Controls whether the whole cell or only the text-area is highlighted
>     * @param cell the cell which is highlighted
>     * @return <code>true</code> if only the text area should be highlighted
>     * @since 3.4
>     */
>    protected boolean onlyTextHighlighting(ViewerCell cell) {
>        return false;
>    }
>
>    @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);
>        }
>    }
>}

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Attachments on bug 268135: 128469 | 128470 | 197612 | 211087