Impl #61 - Provide example on real row reorder

Signed-off-by: Dirk Fauth <dirk.fauth@googlemail.com>

org.eclipse.nebula.widgets.nattable.core/src/org/eclipse/nebula/widgets/nattable/ui/action/ColumnDragMode.java

@@ -0,0 +1,135 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Dirk Fauth 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:
+ *    Dirk Fauth <dirk.fauth@googlemail.com> - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.nebula.widgets.nattable.ui.action;
+
+import org.eclipse.nebula.widgets.nattable.NatTable;
+import org.eclipse.nebula.widgets.nattable.config.IConfigRegistry;
+import org.eclipse.nebula.widgets.nattable.layer.ILayer;
+import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
+import org.eclipse.nebula.widgets.nattable.painter.IOverlayPainter;
+import org.eclipse.nebula.widgets.nattable.painter.cell.ICellPainter;
+import org.eclipse.swt.events.MouseEvent;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.graphics.Rectangle;
+
+/**
+ * {@link IDragMode} to visualize a column as overlay.
+ *
+ * @since 2.3
+ */
+public class ColumnDragMode implements IDragMode {
+
+    private MouseEvent initialEvent;
+    private MouseEvent currentEvent;
+
+    private int xOffset;
+    private Image columnImage;
+    protected ColumnImageOverlayPainter columnImageOverlayPainter = new ColumnImageOverlayPainter();
+
+    @Override
+    public void mouseDown(NatTable natTable, MouseEvent event) {
+        this.initialEvent = event;
+        this.currentEvent = this.initialEvent;
+
+        setColumnImage(natTable);
+
+        natTable.forceFocus();
+
+        natTable.addOverlayPainter(this.columnImageOverlayPainter);
+    }
+
+    @Override
+    public void mouseMove(NatTable natTable, MouseEvent event) {
+        this.currentEvent = event;
+
+        natTable.redraw(0, 0, natTable.getWidth(), natTable.getHeight(), false);
+    }
+
+    @Override
+    public void mouseUp(NatTable natTable, MouseEvent event) {
+        natTable.removeOverlayPainter(this.columnImageOverlayPainter);
+
+        if (this.columnImage != null) {
+            this.columnImage.dispose();
+        }
+
+        natTable.redraw(0, 0, natTable.getWidth(), natTable.getHeight(), false);
+    }
+
+    protected MouseEvent getInitialEvent() {
+        return this.initialEvent;
+    }
+
+    protected MouseEvent getCurrentEvent() {
+        return this.currentEvent;
+    }
+
+    private void setColumnImage(NatTable natTable) {
+        int columnPosition = natTable.getColumnPositionByX(this.currentEvent.x);
+
+        IConfigRegistry configRegistry = natTable.getConfigRegistry();
+        int y = 0;
+        ILayerCell cell = null;
+
+        Image image = null;
+        GC gc = null;
+
+        for (int rowPosition = 0; rowPosition < natTable.getRowCount(); rowPosition++) {
+            cell = natTable.getCellByPosition(columnPosition, rowPosition);
+
+            if (cell != null) {
+                Rectangle cellBounds = cell.getBounds();
+                this.xOffset = this.currentEvent.x - cellBounds.x;
+
+                if (image == null && gc == null) {
+                    image = new Image(natTable.getDisplay(), cellBounds.width, natTable.getHeight());
+                    gc = new GC(image);
+                }
+
+                ICellPainter cellPainter = cell.getLayer().getCellPainter(columnPosition, rowPosition, cell, configRegistry);
+                if (cellPainter != null) {
+                    cellPainter.paintCell(cell, gc, new Rectangle(0, y, cellBounds.width, cellBounds.height), configRegistry);
+                    y += cellBounds.height;
+                }
+            }
+        }
+
+        if (gc != null) {
+            gc.dispose();
+        }
+
+        if (image != null) {
+
+            ImageData imageData = image.getImageData();
+            image.dispose();
+            imageData.alpha = 150;
+
+            this.columnImage = new Image(natTable.getDisplay(), imageData);
+        }
+    }
+
+    private class ColumnImageOverlayPainter implements IOverlayPainter {
+
+        @Override
+        public void paintOverlay(GC gc, ILayer layer) {
+            if (ColumnDragMode.this.columnImage != null && !ColumnDragMode.this.columnImage.isDisposed()) {
+                gc.drawImage(
+                        ColumnDragMode.this.columnImage,
+                        ColumnDragMode.this.currentEvent.x - ColumnDragMode.this.xOffset,
+                        0);
+            }
+        }
+    }
+}

org.eclipse.nebula.widgets.nattable.core/src/org/eclipse/nebula/widgets/nattable/ui/action/RowDragMode.java

@@ -0,0 +1,134 @@
+/*******************************************************************************
+ * Copyright (c) 2024 Dirk Fauth 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:
+ *    Dirk Fauth <dirk.fauth@googlemail.com> - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.nebula.widgets.nattable.ui.action;
+
+import org.eclipse.nebula.widgets.nattable.NatTable;
+import org.eclipse.nebula.widgets.nattable.config.IConfigRegistry;
+import org.eclipse.nebula.widgets.nattable.layer.ILayer;
+import org.eclipse.nebula.widgets.nattable.layer.cell.ILayerCell;
+import org.eclipse.nebula.widgets.nattable.painter.IOverlayPainter;
+import org.eclipse.nebula.widgets.nattable.painter.cell.ICellPainter;
+import org.eclipse.swt.events.MouseEvent;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.graphics.Rectangle;
+
+/**
+ * {@link IDragMode} to visualize a row as overlay.
+ *
+ * @since 2.3
+ */
+public class RowDragMode implements IDragMode {
+
+    private MouseEvent initialEvent;
+    private MouseEvent currentEvent;
+
+    private int yOffset;
+    private Image rowImage;
+    protected RowImageOverlayPainter rowImageOverlayPainter = new RowImageOverlayPainter();
+
+    @Override
+    public void mouseDown(NatTable natTable, MouseEvent event) {
+        this.initialEvent = event;
+        this.currentEvent = this.initialEvent;
+
+        setRowImage(natTable);
+
+        natTable.forceFocus();
+
+        natTable.addOverlayPainter(this.rowImageOverlayPainter);
+    }
+
+    @Override
+    public void mouseMove(NatTable natTable, MouseEvent event) {
+        this.currentEvent = event;
+
+        natTable.redraw(0, 0, natTable.getWidth(), natTable.getHeight(), false);
+    }
+
+    @Override
+    public void mouseUp(NatTable natTable, MouseEvent event) {
+        natTable.removeOverlayPainter(this.rowImageOverlayPainter);
+
+        if (this.rowImage != null) {
+            this.rowImage.dispose();
+        }
+
+        natTable.redraw(0, 0, natTable.getWidth(), natTable.getHeight(), false);
+    }
+
+    protected MouseEvent getInitialEvent() {
+        return this.initialEvent;
+    }
+
+    protected MouseEvent getCurrentEvent() {
+        return this.currentEvent;
+    }
+
+    private void setRowImage(NatTable natTable) {
+        int rowPosition = natTable.getRowPositionByY(this.currentEvent.y);
+
+        IConfigRegistry configRegistry = natTable.getConfigRegistry();
+        int x = 0;
+        ILayerCell cell = null;
+
+        Image image = null;
+        GC gc = null;
+
+        for (int columnPosition = 0; columnPosition < natTable.getColumnCount(); columnPosition++) {
+            cell = natTable.getCellByPosition(columnPosition, rowPosition);
+
+            if (cell != null) {
+                Rectangle cellBounds = cell.getBounds();
+                this.yOffset = this.currentEvent.y - cellBounds.y;
+
+                if (image == null && gc == null) {
+                    image = new Image(natTable.getDisplay(), natTable.getWidth(), cellBounds.height);
+                    gc = new GC(image);
+                }
+
+                ICellPainter cellPainter = cell.getLayer().getCellPainter(columnPosition, rowPosition, cell, configRegistry);
+                if (cellPainter != null) {
+                    cellPainter.paintCell(cell, gc, new Rectangle(x, 0, cellBounds.width, cellBounds.height), configRegistry);
+                    x += cellBounds.width;
+                }
+            }
+        }
+
+        if (gc != null) {
+            gc.dispose();
+        }
+
+        if (image != null) {
+            ImageData imageData = image.getImageData();
+            image.dispose();
+            imageData.alpha = 150;
+
+            this.rowImage = new Image(natTable.getDisplay(), imageData);
+        }
+    }
+
+    private class RowImageOverlayPainter implements IOverlayPainter {
+
+        @Override
+        public void paintOverlay(GC gc, ILayer layer) {
+            if (RowDragMode.this.rowImage != null && !RowDragMode.this.rowImage.isDisposed()) {
+                gc.drawImage(
+                        RowDragMode.this.rowImage,
+                        0,
+                        RowDragMode.this.currentEvent.y - RowDragMode.this.yOffset);
+            }
+        }
+    }
+}