From 5c0e2db7d1372cde77102876af94de9cb73c7e79 Mon Sep 17 00:00:00 2001
From: rene <rene.evertz@ownsoft.de>
Date: Fri, 31 Mar 2023 15:52:23 +0200
Subject: [PATCH] =?UTF-8?q?simples=20drag=20n=20drop=20->=20egde=20cases?=
 =?UTF-8?q?=20m=C3=BCssen=20noch=20betrachtet=20werden?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 BeWo/View/Detail/MassnahmenTreeViewView.xaml  |   6 +-
 .../Detail/MassnahmenTreeViewView.xaml.cs     | 147 +++++++++++++++++-
 2 files changed, 146 insertions(+), 7 deletions(-)

diff --git a/BeWo/View/Detail/MassnahmenTreeViewView.xaml b/BeWo/View/Detail/MassnahmenTreeViewView.xaml
index 6a73b4b17..aa81659a3 100644
--- a/BeWo/View/Detail/MassnahmenTreeViewView.xaml
+++ b/BeWo/View/Detail/MassnahmenTreeViewView.xaml
@@ -83,7 +83,9 @@
 						      ItemContainerStyle="{DynamicResource igoal_treeitemstyle}"
                   ItemTemplate="{DynamicResource igoal_treeitemtemplate}" Grid.RowSpan="1" ContextMenu="{StaticResource cmGoals}"
                   PreviewMouseDown="GoalTreeViewItem_PreviewMouseRightButtonDown" 
-						      ItemsSource="{Binding IndividualGoalTree, UpdateSourceTrigger=PropertyChanged}" >
+						      ItemsSource="{Binding IndividualGoalTree, UpdateSourceTrigger=PropertyChanged}" 
+                          MouseDown="TreeView_MouseDown" MouseMove="TreeView_MouseMove" 
+                           AllowDrop="True" PreviewDragOver="TreeView_PreviewDragOver" PreviewDrop="TreeView_PreviewDrop"  >
                     <TreeView.Resources>
                         <Style x:Key="igoal_treeitemstyle" TargetType="TreeViewItem">
                             <Setter Property="IsExpanded" Value="{Binding Path=IsExpanded, Mode=TwoWay}" />
@@ -102,7 +104,7 @@
                                 <TextBox Margin="0,0,0,0" Cursor="Arrow" Background="Transparent" Height="21" Padding="0,3,0,0" VerticalAlignment="Center" 
 								           LostFocus="TextBox_LostFocus" KeyDown="TextBox_KeyDown" BorderThickness="0" 
 								           IsReadOnly="True" Text="{Binding Path=GoalEntryVM.DisplayName, UpdateSourceTrigger=PropertyChanged, Mode=OneWay}"
-								           FontWeight="{Binding Path=IsGoal, Converter={StaticResource ValueListEntryTypeToFontWeightConverter}}" ToolTipService.ShowDuration="100000">
+								           FontWeight="{Binding Path=IsGoal, Converter={StaticResource ValueListEntryTypeToFontWeightConverter}}" ToolTipService.ShowDuration="100000" Focusable="False">
                                     <TextBox.ToolTip>
                                         <StackPanel Orientation="Vertical">
                                             <Label FontWeight="Bold" Content="{Binding Path=GoalEntryVM.DisplayName, Mode=OneWay}"/>
diff --git a/BeWo/View/Detail/MassnahmenTreeViewView.xaml.cs b/BeWo/View/Detail/MassnahmenTreeViewView.xaml.cs
index eebd9285d..997bb8c64 100644
--- a/BeWo/View/Detail/MassnahmenTreeViewView.xaml.cs
+++ b/BeWo/View/Detail/MassnahmenTreeViewView.xaml.cs
@@ -40,6 +40,9 @@ namespace BeWo.View.Detail
 
         private MassnahmenTreeCopyType _CopyType;
         private SupportConceptGoalTreeItem _CopyItem;
+        private Point _lastMouseDown;
+        private SupportConceptGoalTreeItem _draggedItem;
+        private SupportConceptGoalTreeItem _parent;
 
         public MassnahmenTreeViewView(GenericValueListEntryListVM pViewModel)
         {
@@ -86,6 +89,11 @@ namespace BeWo.View.Detail
             {
                 _SelectedGoalTreeNode = null;
             }
+
+            if (e.ChangedButton == MouseButton.Left)
+            {
+                _lastMouseDown = e.GetPosition(TreeView);
+            }
         }
 
         private void TextBox_LostFocus(object sender, RoutedEventArgs e)
@@ -161,14 +169,14 @@ namespace BeWo.View.Detail
                     else
                     {
                         if (selectedItem != null)
-                            CopyTreeItem(selectedItem, _CopyItem);
+                            CopyTreeItem(selectedItem, _CopyItem, false);
                     }
-                    
+
                     break;
             }
         }
 
-        private void CopyTreeItem(SupportConceptGoalTreeItem parent, SupportConceptGoalTreeItem source)
+        private void CopyTreeItem(SupportConceptGoalTreeItem parent, SupportConceptGoalTreeItem source, bool force_deep_copy)
         {
             if (source == null || parent == null)
                 throw new NotImplementedException("#43298467891364987");
@@ -176,11 +184,11 @@ namespace BeWo.View.Detail
             var wm = source.GoalEntryVM;
             var node = AddTreeItem(parent, wm.Type, wm.Description, wm.Abbreviation, wm.Notice);
 
-            if (_CopyType == MassnahmenTreeCopyType.Subtree)
+            if (_CopyType == MassnahmenTreeCopyType.Subtree || force_deep_copy)
             {
                 foreach (var child in source.Items)
                 {
-                    CopyTreeItem(node, child);
+                    CopyTreeItem(node, child, force_deep_copy);
                 }
             }
         }
@@ -764,6 +772,135 @@ namespace BeWo.View.Detail
         {
             _Bearbeitungsmodus = false;
         }
+
+        private void TreeView_MouseDown(object sender, MouseButtonEventArgs e)
+        {
+            if (e.ChangedButton == MouseButton.Left)
+            {
+                _lastMouseDown = e.GetPosition(TreeView);
+            }
+        }
+
+        private void TreeView_MouseMove(object sender, MouseEventArgs e)
+        {
+            try
+            {
+                if (e.LeftButton == MouseButtonState.Pressed)
+                {
+                    Point currentPosition = e.GetPosition(TreeView);
+
+                    if ((Math.Abs(currentPosition.X - _lastMouseDown.X) > 10.0) ||
+                        (Math.Abs(currentPosition.Y - _lastMouseDown.Y) > 10.0))
+                    {
+                        _draggedItem = (SupportConceptGoalTreeItem)TreeView.SelectedItem;
+                        if (_draggedItem != null)
+                        {
+                            DragDropEffects finalDropEffect = DragDrop.DoDragDrop(TreeView, _SelectedGoalTreeNode, DragDropEffects.Move);
+                            //Checking target is not null and item is
+                            //dragging(moving)
+                            if ((finalDropEffect == DragDropEffects.Move) && (_parent != null) && _parent != _draggedItem)
+                            {
+                                var origin_parent = _draggedItem.ParentGoal as SupportConceptGoalTreeItem;
+                                var parent = _parent;
+                                var child = _draggedItem;
+                                
+                                origin_parent.Items.Remove(child);
+                                child.GoalEntryVM.ParentEntry = parent.GoalEntryDC ?? parent.GoalEntryVM.CommitToDataContract();
+                                parent.Items.Add(_draggedItem);
+                                parent.IsExpanded = true;
+                                TreeView.RefreshUI();                                
+                            }
+                        }
+                    }
+                }
+            }
+            catch (Exception)
+            {
+            }
+        }
+
+        private SupportConceptGoalTreeItem GetNearestContainer(UIElement element)
+        {
+            // Walk up the element tree to the nearest tree view item.
+            TreeViewItem container = element as TreeViewItem;
+            while ((container == null) && (element != null))
+            {
+                element = VisualTreeHelper.GetParent(element) as UIElement;
+                container = element as TreeViewItem;
+            }
+            return container.DataContext as SupportConceptGoalTreeItem;
+            //return container;
+        }
+
+        private bool CheckDropTarget(SupportConceptGoalTreeItem _sourceItem, SupportConceptGoalTreeItem _targetItem)
+        {
+            if (_sourceItem == null || _targetItem == null)
+                return false;
+
+            //Check whether the target item is meeting your condition
+
+            var source = _sourceItem as SupportConceptGoalTreeItem;
+            var target = _targetItem as SupportConceptGoalTreeItem;
+
+            bool _isEqual = false;
+            // Unterschiedlicher Parent
+            if (source.GoalEntryVM.ParentEntry.ValueListEntryOid.Value != target.GoalEntryDC.ValueListEntryOid.Value)
+            {
+                // Nicht eigener
+                if (!IstGleichesZiel(source.GoalEntryVM, target.GoalEntryVM))
+                {
+                    _isEqual = true;
+                }
+            }
+            return _isEqual;
+        }
+
+        private void TreeView_PreviewDragOver(object sender, DragEventArgs e)
+        {
+            try
+            {
+                Point currentPosition = e.GetPosition(TreeView);
+
+                if ((Math.Abs(currentPosition.X - _lastMouseDown.X) > 0.0) ||
+                   (Math.Abs(currentPosition.Y - _lastMouseDown.Y) > 0.0))
+                {
+                    // Verify that this is a valid drop and then store the drop target
+                    var item = GetNearestContainer(e.OriginalSource as UIElement);
+                    if (CheckDropTarget(_draggedItem, item))
+                    {
+                        e.Effects = DragDropEffects.Move;
+                    }
+                    else
+                    {
+                        e.Effects = DragDropEffects.None;
+                    }
+                }
+                e.Handled = true;
+            }
+            catch (Exception)
+            {
+            }
+        }
+
+        private void TreeView_PreviewDrop(object sender, DragEventArgs e)
+        {
+            try
+            {
+                e.Effects = DragDropEffects.None;
+                e.Handled = true;
+
+                // Verify that this is a valid drop and then store the drop target
+                var target = GetNearestContainer(e.OriginalSource as UIElement);
+                if (target != null && _draggedItem != null)
+                {
+                    _parent = target;
+                    e.Effects = DragDropEffects.Move;
+                }
+            }
+            catch (Exception)
+            {
+            }
+        }
     }
 
     public class ValueListEntryTypeToFontWeightConverter : IValueConverter