From e575d74ae19122297908f2205292aec7e1eb3448 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Thu, 8 Sep 2011 13:41:32 +0200
Subject: [PATCH] no dnd when there's no selected live template at the mouse
 position (IDEA-74040)

---
 .../codeInsight/template/impl/TemplateListPanel.java      | 8 ++++++--
 .../src/com/intellij/ide/dnd/aware/DnDAwareTree.java      | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateListPanel.java b/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateListPanel.java
index f134d2caf74a..395eb3341066 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateListPanel.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateListPanel.java
@@ -614,6 +614,9 @@ public class TemplateListPanel extends JPanel implements Disposable {
       .setBeanProvider(new NullableFunction<DnDActionInfo, DnDDragStartBean>() {
         @Override
         public DnDDragStartBean fun(DnDActionInfo dnDActionInfo) {
+          Point point = dnDActionInfo.getPoint();
+          if (myTree.getPathForLocation(point.x, point.y) == null) return null;
+
           int selectedIndex = getSelectedIndex();
           TemplateImpl template = getTemplate(selectedIndex);
           return template != null ? new DnDDragStartBean(Pair.create(template, getNode(selectedIndex))) : null;
@@ -640,11 +643,12 @@ public class TemplateListPanel extends JPanel implements Disposable {
           moveTemplate(pair.first, ObjectUtils.assertNotNull(getDropGroup(event)).getName(), pair.second);
         }
       })
-      .setImageProvider(new Function<DnDActionInfo, DnDImage>() {
+      .setImageProvider(new NullableFunction<DnDActionInfo, DnDImage>() {
         @Override
         public DnDImage fun(DnDActionInfo dnDActionInfo) {
           Point point = dnDActionInfo.getPoint();
-          return new DnDImage(DnDAwareTree.getDragImage(myTree, myTree.getPathForLocation(point.x, point.y), point).first);
+          TreePath path = myTree.getPathForLocation(point.x, point.y);
+          return path == null ? null : new DnDImage(DnDAwareTree.getDragImage(myTree, path, point).first);
         }
       })
       .install();
diff --git a/platform/platform-impl/src/com/intellij/ide/dnd/aware/DnDAwareTree.java b/platform/platform-impl/src/com/intellij/ide/dnd/aware/DnDAwareTree.java
index 7a977d06af11..3957149b1967 100644
--- a/platform/platform-impl/src/com/intellij/ide/dnd/aware/DnDAwareTree.java
+++ b/platform/platform-impl/src/com/intellij/ide/dnd/aware/DnDAwareTree.java
@@ -66,7 +66,7 @@ public class DnDAwareTree extends Tree implements DnDAware {
     return this;
   }
 
-  public static Pair<Image, Point> getDragImage(Tree dndAwareTree, TreePath path, Point dragOrigin) {
+  public static Pair<Image, Point> getDragImage(Tree dndAwareTree, @NotNull TreePath path, Point dragOrigin) {
     int row = dndAwareTree.getRowForPath(path);
     Component comp = dndAwareTree.getCellRenderer().getTreeCellRendererComponent(dndAwareTree, path.getLastPathComponent(), false, true, true, row, false);
     return createDragImage(dndAwareTree, comp, dragOrigin, true);