Implement moving of elements.

- NEU: Elemente können verschoben werden.

zaaReloaded2/ViewModels/SettingsViewModel.cs

@@ -280,6 +280,34 @@ namespace zaaReloaded2.ViewModels
             }
         }
 
+        public DelegatingCommand MoveElementUpCommand
+        {
+            get
+            {
+                if (_moveElementUpCommand == null)
+                {
+                    _moveElementUpCommand = new DelegatingCommand(
+                        param => DoMoveElementUp(),
+                        param => CanMoveElementUp());
+                }
+                return _moveElementUpCommand;
+            }
+        }
+
+        public DelegatingCommand MoveElementDownCommand
+        {
+            get
+            {
+                if (_moveElementDownCommand == null)
+                {
+                    _moveElementDownCommand = new DelegatingCommand(
+                        param => DoMoveElementDown(),
+                        param => CanMoveElementDown());
+                }
+                return _moveElementDownCommand;
+            }
+        }
+
         #endregion
 
         #region Public methods
@@ -436,6 +464,201 @@ namespace zaaReloaded2.ViewModels
 
         bool CanCopyElement() { return LastSelectedElement != null && LastSelectedElement.IsSelected; }
 
+        void DoMoveElementUp()
+        {
+            if (CanMoveElementUp())
+            {
+                // We need to get a hold of the LastSelectedElement because a TreeView
+                // might reset the selection when we move elements around.
+                ElementViewModel lastSelectedElement = LastSelectedElement;
+                // Top-level elements are either control elements or format elements;
+                // child elements on the second level however are always format elements
+                // and must be treated differently.
+                if (IsTopLevelElement())
+                {
+                    int index = Elements.IndexOf(lastSelectedElement);
+                    if (lastSelectedElement is ControlElementViewModel ||
+                        Elements[index - 1] is FormatElementViewModel ||
+                        !((ControlElementViewModel)Elements[index - 1]).CanHaveChildren
+                        )
+                    {
+                        // Simple case: top-level control element -- just move it up;
+                        // if the selected element is a format element and the element
+                        // above it is a format element too, just move it up as well.
+                        // If the element above the selected element is a control element,
+                        // but cannot have children, move the selected element up as well.
+                        Elements.RemoveAt(index);
+                        Elements.Insert(index - 1, lastSelectedElement);
+                        _settings.Elements.RemoveAt(index);
+                        _settings.Elements.Insert(
+                            index - 1,
+                            LastSelectedElement.RevealModelObject() as ElementBase);
+                    }
+                    else
+                    {
+                        // If we get here, the selected element is a format element
+                        // and the element above it is a control element that can
+                        // have child elements, i.e. the selected element is demoted
+                        // to a child element of the control element above it.
+                        ControlElementViewModel controlElementAbove =
+                            Elements[index - 1] as ControlElementViewModel;
+                        Elements.RemoveAt(index);
+                        controlElementAbove.AddChildElement(
+                            lastSelectedElement as FormatElementViewModel);
+                        FormatElementBase model = lastSelectedElement.RevealModelObject() as FormatElementBase;
+                        ControlElementBase modelAbove = _settings.Elements[index - 1] as ControlElementBase;
+                        _settings.Elements.RemoveAt(index);
+                        modelAbove.Children.Add(model);
+                    }
+                }
+                else
+                {
+                    // The selected element is a child element.
+                    // If it is at the top of the child elements list, promote it
+                    // to a top-level element; if not, just move it up in the
+                    // child elements list.
+                    FormatElementViewModel selected = lastSelectedElement as FormatElementViewModel;
+                    int index = selected.Parent.Elements.IndexOf(selected);
+                    if (index == 0)
+                    {
+                        // Promote the element from the top of the children list
+                        // to a top-level element above its parent.
+                        int parentIndex = Elements.IndexOf(selected.Parent);
+                        selected.Parent.Elements.RemoveAt(0);
+                        Elements.Insert(parentIndex, selected);
+                        FormatElementBase model = selected.RevealModelObject() as FormatElementBase;
+                        ControlElementBase parentModel = selected.Parent.RevealModelObject() as ControlElementBase;
+                        parentModel.Children.RemoveAt(0);
+                        _settings.Elements.Insert(parentIndex, model);
+                        selected.Parent = null;
+                    }
+                    else
+                    {
+                        selected.Parent.Elements.Move(index, index - 1);
+                        ControlElementBase parentModel = selected.Parent.RevealModelObject() as ControlElementBase;
+                        FormatElementBase selectedModel = parentModel.Children[index];
+                        parentModel.Children.RemoveAt(index);
+                        parentModel.Children.Insert(index - 1, selectedModel);
+                    }
+                }
+                // Select the last selected element again.
+                lastSelectedElement.IsSelected = true;
+            }
+        }
+
+        bool CanMoveElementUp()
+        {
+            if (IsTopLevelElement())
+            {
+                return Elements.IndexOf(LastSelectedElement) > 0;
+            }
+            else
+            {
+                // If the selected element is a child element, it can always be moved
+                // up before the parent element.
+                return LastSelectedElement != null && LastSelectedElement.IsSelected;
+            }
+        }
+
+        void DoMoveElementDown()
+        {
+            if (CanMoveElementDown())
+            {
+                // We need to get a hold of the LastSelectedElement because a TreeView
+                // might reset the selection when we move elements around.
+                ElementViewModel lastSelectedElement = LastSelectedElement;
+                // Top-level elements are either control elements or format elements;
+                // child elements on the second level however are always format elements
+                // and must be treated differently.
+                if (IsTopLevelElement())
+                {
+                    int index = Elements.IndexOf(lastSelectedElement);
+                    if (lastSelectedElement is ControlElementViewModel ||
+                        Elements[index + 1 ] is FormatElementViewModel ||
+                        !((ControlElementViewModel)Elements[index + 1]).CanHaveChildren
+                        )
+                    {
+                        // Simple case: top-level control element -- just move it down;
+                        // if the selected element is a format element and the element
+                        // below it is a format element too, just move it down as well.
+                        // If the element below the selected element is a control element,
+                        // but cannot have children, move the selected element down as well.
+                        Elements.RemoveAt(index);
+                        Elements.Insert(index + 1, lastSelectedElement);
+                        _settings.Elements.RemoveAt(index);
+                        _settings.Elements.Insert(
+                            index + 1,
+                            LastSelectedElement.RevealModelObject() as ElementBase);
+                    }
+                    else
+                    {
+                        // If we get here, the selected element is a format element
+                        // and the element below it is a control element that can
+                        // have child elements, i.e. the selected element is demoted
+                        // to a child element of the control element below it.
+                        ControlElementViewModel controlElementBelow =
+                            Elements[index + 1] as ControlElementViewModel;
+                        Elements.RemoveAt(index);
+                        controlElementBelow.Elements.Insert(
+                            0, 
+                            lastSelectedElement as FormatElementViewModel);
+                        ((FormatElementViewModel)lastSelectedElement).Parent = controlElementBelow;
+                        FormatElementBase model = lastSelectedElement.RevealModelObject() as FormatElementBase;
+                        ControlElementBase modelBelow = _settings.Elements[index + 1] as ControlElementBase;
+                        _settings.Elements.RemoveAt(index);
+                        modelBelow.Children.Insert(0, model);
+                    }
+                }
+                else
+                {
+                    // The selected element is a child element.
+                    // If it is at the bottom of the child elements list, promote it
+                    // to a top-level element; if not, just move it down in the
+                    // child elements list.
+                    FormatElementViewModel selected = lastSelectedElement as FormatElementViewModel;
+                    int index = selected.Parent.Elements.IndexOf(selected);
+                    if (index == selected.Parent.Elements.Count - 1)
+                    {
+                        // Promote the element from the bottom of the children list
+                        // to a top-level element below its parent.
+                        int parentIndex = Elements.IndexOf(selected.Parent);
+                        selected.Parent.Elements.RemoveAt(selected.Parent.Elements.Count - 1);
+                        Elements.Insert(parentIndex + 1, selected);
+                        FormatElementBase model = selected.RevealModelObject() as FormatElementBase;
+                        ControlElementBase parentModel = selected.Parent.RevealModelObject() as ControlElementBase;
+                        parentModel.Children.RemoveAt(parentModel.Children.Count - 1);
+                        _settings.Elements.Insert(parentIndex + 1, model);
+                        selected.Parent = null;
+                    }
+                    else
+                    {
+                        selected.Parent.Elements.Move(index, index + 1);
+                        ControlElementBase parentModel = selected.Parent.RevealModelObject() as ControlElementBase;
+                        FormatElementBase selectedModel = parentModel.Children[index];
+                        parentModel.Children.RemoveAt(index);
+                        parentModel.Children.Insert(index + 1, selectedModel);
+                    }
+                }
+                // Select the last selected element again.
+                lastSelectedElement.IsSelected = true;
+            }
+
+        }
+
+        bool CanMoveElementDown()
+        {
+            if (IsTopLevelElement())
+            {
+                return Elements.IndexOf(LastSelectedElement) < Elements.Count - 1;
+            }
+            else
+            {
+                // If the selected element is a child element, it can always be moved
+                // down after the parent element.
+                return LastSelectedElement != null && LastSelectedElement.IsSelected;
+            }
+        }
+
         /// <summary>
         /// Sets LastSelectedElement property whenever the IsSelected
         /// property of an ElementViewModel changes
@@ -458,7 +681,8 @@ namespace zaaReloaded2.ViewModels
         /// </summary>
         bool IsTopLevelElement()
         {
-            return (LastSelectedElement is ControlElementViewModel ||
+            return LastSelectedElement != null &&
+                (LastSelectedElement is ControlElementViewModel ||
                 ((FormatElementViewModel)LastSelectedElement).Parent == null);
         }
 
@@ -490,6 +714,8 @@ namespace zaaReloaded2.ViewModels
         DelegatingCommand _editElementCommand;
         DelegatingCommand _deleteElementCommand;
         DelegatingCommand _copyElementCommand;
+        DelegatingCommand _moveElementUpCommand;
+        DelegatingCommand _moveElementDownCommand;
         Message<ViewModelMessageContent> _addElementMessage;
         Message<ViewModelMessageContent> _addChildElementMessage;
         Message<ViewModelMessageContent> _editElementMessage;

zaaReloaded2/Views/SettingsView.xaml

@@ -23,7 +23,8 @@
         xmlns:b="clr-namespace:Bovender.Mvvm.Views.Settings;assembly=Bovender"
         xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
         xmlns:action="clr-namespace:Bovender.Mvvm.Actions;assembly=Bovender"
-        Width="500" Height="440" ResizeMode="CanResizeWithGrip" ShowInTaskbar="False"
+        Width="460" Height="400" ResizeMode="CanResizeWithGrip" ShowInTaskbar="False"
+        MinWidth="460" MinHeight="400"
         WindowStyle="ToolWindow" Topmost="True"
         b:WindowState.CenterScreen="True" b:WindowState.Save="True"
         Title="Stil bearbeiten"
@@ -66,21 +67,30 @@
         <GroupBox Header="Elemente" Margin="0 10 0 0">
             <DockPanel LastChildFill="True">
                 <StackPanel DockPanel.Dock="Right" Margin="10 0 0 0">
-                    <Button Command="{Binding AddElementCommand}" ToolTip="Neues Element" Margin="0 0 0 10">
+                    <!-- need the stack panel to prevent stretching of the uniform grid -->
-                        <Image Source="/zaaReloaded2;component/Icons/plus.png" Width="24" />
+                    <UniformGrid Columns="2">
-                    </Button>
+                        <Button Command="{Binding AddElementCommand}" ToolTip="Neues Element" Margin="0 0 5 10">
-                    <Button Command="{Binding AddChildElementCommand}" ToolTip="Neues Kindelement" Margin="0 0 0 10">
+                            <Image Source="/zaaReloaded2;component/Icons/plus.png" Width="24" />
-                        <Image Source="/zaaReloaded2;component/Icons/plus-child.png" Width="24" />
+                        </Button>
-                    </Button>
+                        <Button Command="{Binding EditElementCommand}" IsDefault="True" ToolTip="Bearbeiten" Margin="5 0 0 10">
-                    <Button Command="{Binding DeleteElementCommand}" ToolTip="Entfernen" Margin="0 0 0 10">
+                            <Image Source="/zaaReloaded2;component/Icons/pen.png" Width="24" />
-                        <Image Source="/zaaReloaded2;component/Icons/minus.png" Width="24" />
+                        </Button>
-                    </Button>
+                        <Button Command="{Binding AddChildElementCommand}" ToolTip="Neues Kindelement" Margin="0 0 5 10">
-                    <Button Command="{Binding EditElementCommand}" IsDefault="True" ToolTip="Bearbeiten" Margin="0 0 0 10">
+                            <Image Source="/zaaReloaded2;component/Icons/plus-child.png" Width="24" />
-                        <Image Source="/zaaReloaded2;component/Icons/pen.png" Width="24" />
+                        </Button>
-                    </Button>
+                        <Button Command="{Binding MoveElementUpCommand}" ToolTip="Nach oben" Margin="5 0 0 10">
-                    <Button Command="{Binding CopyElementCommand}" ToolTip="Kopieren" Margin="0 0 0 10">
+                            <Image Source="/zaaReloaded2;component/Icons/up.png" Width="24" />
-                        <Image Source="/zaaReloaded2;component/Icons/duplicate.png" Width="24" />
+                        </Button>
-                    </Button>
+                        <Button Command="{Binding DeleteElementCommand}" ToolTip="Entfernen" Margin="0 0 5 10">
+                            <Image Source="/zaaReloaded2;component/Icons/minus.png" Width="24" />
+                        </Button>
+                        <Button Command="{Binding MoveElementDownCommand}" ToolTip="Nach unten" Margin="5 0 0 10">
+                            <Image Source="/zaaReloaded2;component/Icons/down.png" Width="24" />
+                        </Button>
+                        <Button Command="{Binding CopyElementCommand}" ToolTip="Kopieren" Margin="0 0 5 10">
+                            <Image Source="/zaaReloaded2;component/Icons/duplicate.png" Width="24" />
+                        </Button>
+                    </UniformGrid>
                 </StackPanel>
                 <TreeView ItemsSource="{Binding Elements}">
                     <TreeView.ItemContainerStyle>

zaaReloaded2/zaaReloaded2.csproj

@@ -401,6 +401,10 @@
   <ItemGroup>
     <Resource Include="Icons\plus-child.png" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Icons\down.png" />
+    <Resource Include="Icons\up.png" />
+  </ItemGroup>
   <PropertyGroup>
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
     <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>