Support line breaks in string contents.

refs 2450

org.fortiss.tooling.base.ui/trunk/src/org/fortiss/tooling/base/ui/annotation/view/generic/GenericAnnotationView.java

@@ -20,6 +20,7 @@ package org.fortiss.tooling.base.ui.annotation.view.generic;
 import static org.fortiss.tooling.base.ui.annotation.editingsupport.EditingSupportFactory.createEditingSupport;
 import static org.fortiss.tooling.base.ui.annotation.labelprovider.LabelProviderFactory.createLabelProvider;
 
+import java.lang.reflect.Method;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
@@ -36,12 +37,16 @@ import org.eclipse.jface.viewers.TableViewer;
 import org.eclipse.jface.viewers.TableViewerColumn;
 import org.eclipse.jface.window.ToolTip;
 import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.layout.FillLayout;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Event;
+import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.Table;
 import org.eclipse.swt.widgets.TableColumn;
+import org.eclipse.swt.widgets.TableItem;
 import org.fortiss.tooling.base.annotation.AnnotationEntry;
 import org.fortiss.tooling.base.annotation.IAnnotationValueService;
 import org.fortiss.tooling.base.annotation.valueprovider.IAnnotationValueProvider;
@@ -69,7 +74,7 @@ import org.fortiss.tooling.base.ui.annotation.view.generic.filter.AnnotationFilt
  * @author eder, diewald, barner
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating YELLOW Hash: BF52B9E58D2D44E769E05ADCC62499CD
+ * @ConQAT.Rating YELLOW Hash: BBED92F55537563D7EF594EF27F36870
  */
 public class GenericAnnotationView extends AnnotationViewPartBase {
 	/** Root composite of {@link GenericAnnotationView}. */
@@ -101,6 +106,9 @@ public class GenericAnnotationView extends AnnotationViewPartBase {
 	/** Default width of columns. */
 	static final int COLUMN_DEFAULT_WIDTH = 125;
 
+	/** Default height of rows. */
+	private int defaultRowHeight;
+
 	/**
 	 * Sets a fixed {@link AnnotationFilter}.
 	 * <ul>
@@ -233,6 +241,11 @@ public class GenericAnnotationView extends AnnotationViewPartBase {
 			}
 
 			tableViewer.getTable().setRedraw(true);
+
+			// After contents change, restore row height. It will be adjusted to the new content
+			// using the TableViewer's SWT.{MeasureItem, PaintItem, EraseItem} listeners installed
+			// in addRowHeightListener()
+			setTableItemHeight(tableViewer.getTable(), defaultRowHeight);
 		}
 
 		// Update the view
@@ -258,6 +271,64 @@ public class GenericAnnotationView extends AnnotationViewPartBase {
 		annotationFilterWidget.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
 	}
 
+	/**
+	 * Sets the item height of the given {@link Table} to the specified value.
+	 *
+	 * <b>The underlying method {@code Table#setItemHeight} is not exposed. This wrapper method
+	 * should only called during a full {@link #update(Collection)} of the table's contents.</b>>
+	 */
+	private void setTableItemHeight(Table table, int height) {
+		try {
+			Method method = table.getClass().getDeclaredMethod("setItemHeight", int.class);
+			if(method != null) {
+				boolean accessible = method.isAccessible();
+				method.setAccessible(true);
+				method.invoke(table, height);
+				method.setAccessible(accessible);
+			}
+		} catch(Exception e) {
+			// ignore
+		}
+	}
+
+	/**
+	 * Installs a listener to the given {@link Table} that adjust the row height to to the current
+	 * contents.
+	 */
+	private void addRowHeightListener(Table table) {
+		Listener rowHeightListener = new Listener() {
+			@Override
+			public void handleEvent(Event event) {
+				switch(event.type) {
+					case SWT.MeasureItem: {
+						TableItem item = (TableItem)event.item;
+						String text = item.getText(event.index);
+						Point size = event.gc.textExtent(text);
+						event.width = size.x;
+						event.height = Math.max(event.height, size.y);
+						break;
+					}
+					case SWT.PaintItem: {
+						TableItem item = (TableItem)event.item;
+						String text = item.getText(event.index);
+						Point size = event.gc.textExtent(text);
+						int offset =
+								event.index == 0 ? Math.max(0, (event.height - size.y) / 2) : 0;
+						event.gc.drawText(text, event.x, event.y + offset, true);
+						break;
+					}
+					case SWT.EraseItem: {
+						event.detail &= ~SWT.FOREGROUND;
+						break;
+					}
+				}
+			}
+		};
+		table.addListener(SWT.MeasureItem, rowHeightListener);
+		table.addListener(SWT.PaintItem, rowHeightListener);
+		table.addListener(SWT.EraseItem, rowHeightListener);
+	}
+
 	/** {@inheritDoc} */
 	@Override
 	public void createPartControl(Composite parent) {
@@ -271,6 +342,13 @@ public class GenericAnnotationView extends AnnotationViewPartBase {
 		table.setLinesVisible(true);
 		table.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
 
+		// Listener to adjust row height to contents
+		addRowHeightListener(table);
+
+		// Preserve default row-height (used to restore it during contents updates in
+		// update(Collection<AnnotationEntry>)).
+		defaultRowHeight = table.getItemHeight();
+
 		ColumnViewerToolTipSupport.enableFor(tableViewer, ToolTip.NO_RECREATE);
 
 		// Install layout for Table in order to ensure that it claims all available vertical space