From 584b2b87593892c6ded7b645425b603a4f554026 Mon Sep 17 00:00:00 2001
From: Mathieu Baudier <mbaudier@argeo.org>
Date: Fri, 3 Jun 2022 05:49:15 +0200
Subject: [PATCH] Introduce SWT hierarchical part

---
 .../src/org/argeo/cms/swt/CmsSwtUtils.java    | 19 +++++
 .../cms/swt/widgets/SwtHierarchicalPart.java  | 83 +++++++++++++++++++
 2 files changed, 102 insertions(+)
 create mode 100644 eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/SwtHierarchicalPart.java

diff --git a/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/CmsSwtUtils.java b/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/CmsSwtUtils.java
index 701de2827..3ff747949 100644
--- a/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/CmsSwtUtils.java
+++ b/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/CmsSwtUtils.java
@@ -11,6 +11,7 @@ import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.layout.FormAttachment;
 import org.eclipse.swt.layout.FormData;
+import org.eclipse.swt.layout.FormLayout;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.layout.RowData;
@@ -19,6 +20,7 @@ import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
+import org.eclipse.swt.widgets.Layout;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.swt.widgets.Widget;
@@ -99,6 +101,23 @@ public class CmsSwtUtils {
 		sendEventOnSelect(control, topic, properties);
 	}
 
+	/*
+	 * LAYOUT INDEPENDENT
+	 */
+	/** Takes the most space possible, depending on parent layout. */
+	public static void fill(Control control) {
+		Layout parentLayout = control.getParent().getLayout();
+		if (parentLayout == null)
+			throw new IllegalStateException("Parent layout is not set");
+		if (parentLayout instanceof GridLayout) {
+			control.setLayoutData(fillAll());
+		} else if (parentLayout instanceof FormLayout) {
+			control.setLayoutData(coverAll());
+		} else {
+			throw new IllegalArgumentException("Unsupported parent layout  " + parentLayout.getClass().getName());
+		}
+	}
+
 	/*
 	 * GRID LAYOUT
 	 */
diff --git a/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/SwtHierarchicalPart.java b/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/SwtHierarchicalPart.java
new file mode 100644
index 000000000..d390b5364
--- /dev/null
+++ b/eclipse/org.argeo.cms.swt/src/org/argeo/cms/swt/widgets/SwtHierarchicalPart.java
@@ -0,0 +1,83 @@
+package org.argeo.cms.swt.widgets;
+
+import java.util.function.Consumer;
+
+import org.argeo.cms.swt.CmsSwtUtils;
+import org.argeo.cms.ux.widgets.HierarchicalPart;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.SelectionEvent;
+import org.eclipse.swt.events.SelectionListener;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Tree;
+import org.eclipse.swt.widgets.TreeItem;
+
+/** {@link HierarchicalPart} implementation based on a {@link Tree}. */
+public class SwtHierarchicalPart extends Composite implements HierarchicalPart {
+	private static final long serialVersionUID = -2189742596757101778L;
+
+	private final Tree tree;
+
+	private Consumer<Object> onSelected;
+	private Consumer<Object> onAction;
+
+	public SwtHierarchicalPart(Composite parent, int style) {
+		super(parent, style);
+		setLayout(CmsSwtUtils.noSpaceGridLayout());
+		tree = new Tree(this, SWT.VIRTUAL | SWT.BORDER);
+	}
+
+	public void refresh() {
+		tree.addListener(SWT.SetData, event -> {
+			TreeItem item = (TreeItem) event.item;
+			TreeItem parentItem = item.getParentItem();
+			if (parentItem == null) {
+				refreshRootItem(item);
+			} else {
+				refreshItem(parentItem, parentItem);
+			}
+		});
+		tree.setItemCount(getRootItemCount());
+		CmsSwtUtils.fill(tree);
+
+		tree.addSelectionListener(new SelectionListener() {
+
+			private static final long serialVersionUID = 4334785560035009330L;
+
+			@Override
+			public void widgetSelected(SelectionEvent e) {
+				onSelected.accept(e.item.getData());
+			}
+
+			@Override
+			public void widgetDefaultSelected(SelectionEvent e) {
+				onAction.accept(e.item.getData());
+			}
+		});
+
+	}
+
+	protected void refreshRootItem(TreeItem item) {
+
+	}
+
+	protected void refreshItem(TreeItem parentItem, TreeItem item) {
+
+	}
+
+	protected int getRootItemCount() {
+		return 0;
+	}
+
+	protected Tree getTree() {
+		return tree;
+	}
+
+	public void onSelected(Consumer<Object> onSelected) {
+		this.onSelected = onSelected;
+	}
+
+	public void onAction(Consumer<Object> onAction) {
+		this.onAction = onAction;
+	}
+
+}
-- 
2.39.2