X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;f=org.argeo.eclipse.ui%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Feclipse%2Fui%2FColumnViewerComparator.java;fp=org.argeo.eclipse.ui%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Feclipse%2Fui%2FColumnViewerComparator.java;h=8db5d4fe815101f1605d39dd923c404f8158add8;hb=1df1bf64759d35d3d72b9d96b26b71118fdbe031;hp=0000000000000000000000000000000000000000;hpb=3a3d316af102ba410d1d9e6de349d0c8f7ac044f;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/ColumnViewerComparator.java b/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/ColumnViewerComparator.java
new file mode 100644
index 000000000..8db5d4fe8
--- /dev/null
+++ b/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/ColumnViewerComparator.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * 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.
+ */
+package org.argeo.eclipse.ui;
+
+import java.util.Comparator;
+
+import org.eclipse.jface.viewers.ColumnViewer;
+import org.eclipse.jface.viewers.TableViewerColumn;
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.jface.viewers.ViewerComparator;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.SelectionAdapter;
+import org.eclipse.swt.events.SelectionEvent;
+
+/** Generic column viewer sorter */
+public class ColumnViewerComparator<T> extends ViewerComparator {
+	private static final long serialVersionUID = -2266218906355859909L;
+
+	public static final int ASC = 1;
+
+	public static final int NONE = 0;
+
+	public static final int DESC = -1;
+
+	private int direction = 0;
+
+	private TableViewerColumn column;
+
+	private ColumnViewer viewer;
+
+	public ColumnViewerComparator(TableViewerColumn column,
+			Comparator<T> comparator) {
+		super(comparator);
+		this.column = column;
+		this.viewer = column.getViewer();
+		this.column.getColumn().addSelectionListener(new SelectionAdapter() {
+			private static final long serialVersionUID = 7586796298965472189L;
+
+			public void widgetSelected(SelectionEvent e) {
+				if (ColumnViewerComparator.this.viewer.getComparator() != null) {
+					if (ColumnViewerComparator.this.viewer.getComparator() == ColumnViewerComparator.this) {
+						int tdirection = ColumnViewerComparator.this.direction;
+
+						if (tdirection == ASC) {
+							setSortDirection(DESC);
+						} else if (tdirection == DESC) {
+							setSortDirection(NONE);
+						}
+					} else {
+						setSortDirection(ASC);
+					}
+				} else {
+					setSortDirection(ASC);
+				}
+			}
+		});
+	}
+
+	private void setSortDirection(int direction) {
+		if (direction == NONE) {
+			column.getColumn().getParent().setSortColumn(null);
+			column.getColumn().getParent().setSortDirection(SWT.NONE);
+			viewer.setComparator(null);
+		} else {
+			column.getColumn().getParent().setSortColumn(column.getColumn());
+			this.direction = direction;
+
+			if (direction == ASC) {
+				column.getColumn().getParent().setSortDirection(SWT.DOWN);
+			} else {
+				column.getColumn().getParent().setSortDirection(SWT.UP);
+			}
+
+			if (viewer.getComparator() == this) {
+				viewer.refresh();
+			} else {
+				viewer.setComparator(this);
+			}
+
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	public int compare(Viewer viewer, Object e1, Object e2) {
+		return direction * getComparator().compare((T) e1, (T) e2);
+	}
+}