/// <summary>
/// Helper method for the <see cref="ShowContentsCommand"/> binding.
/// </summary>
private void OnShowContentsExecuted(object sender, ExecutedCommandEventArgs e)
{
if (graphControl == null)
{
e.Handled = false;
return;
}
// get the IFoldingView instance
IFoldingView graph = graphControl.Graph.Lookup <IFoldingView>();
if (graph != null)
{
// find the node to show the contents for
INode node = FindNode(graph, e.Parameter);
// if we found one
if (node != null)
{
// show it
ShowContents(graph.GetMasterItem(node));
e.Handled = true;
}
}
else
{
e.Handled = false;
}
}
/// <summary>
/// Handler for the <see cref="ShowAllCommand"/>
/// </summary>
private async void ShowAllExecuted(object sender, ExecutedCommandEventArgs e)
{
if (!doingLayout)
{
hiddenNodesSet.Clear();
await RefreshLayout(-1, graphControl.CurrentItem as INode);
}
}
/// <summary>
/// Handler for the <see cref="DecreaseSequenceCommand"/>
/// </summary>
private void DecreaseSequenceExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = e.Parameter as INode;
if (node != null)
{
var data = (SequenceConstraintsInfo)node.Tag;
data.DecreaseValue();
}
}
/// <summary>
/// Handler for the <see cref="ToggleConstraintsStateCommand"/>
/// </summary>
private void ToggleConstraintsStateExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = e.Parameter as INode;
if (node != null)
{
var data = (SequenceConstraintsInfo)node.Tag;
data.ToggleState();
}
}
/// <summary>
/// Handler for the <see cref="IncreaseLayerCommand"/>
/// </summary>
private void IncreaseLayerExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = e.Parameter as INode;
if (node != null)
{
var data = (LayerConstraintsInfo)node.Tag;
data.IncreaseValue();
}
}
/// <summary>
/// Handler for the <see cref="HideChildrenCommand"/>
/// </summary>
private async void HideChildrenExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = (e.Parameter ?? graphControl.CurrentItem) as INode;
if (node != null && !doingLayout)
{
int count = hiddenNodesSet.Count;
foreach (var child in filteredGraphWrapper.Successors(node))
{
HideAllExcept(child, node);
}
await RefreshLayout(count, node);
}
}
/// <summary>
/// Called when the ToggleChildren command has been executed.
/// </summary>
/// <remarks>
/// Toggles the visiblity of the node's children.
/// </remarks>
public async void ToggleChildrenExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = (e.Parameter ?? graphControl.CurrentItem) as INode;
if (node != null)
{
bool canExpand = filteredGraph.OutDegree(node) != filteredGraph.WrappedGraph.OutDegree(node);
if (canExpand)
{
await Expand(node);
}
else
{
await Collapse(node);
}
}
}
/// <summary>
/// Handler for the <see cref="ShowParentCommand"/>
/// </summary>
private async void ShowParentExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = (e.Parameter ?? graphControl.CurrentItem) as INode;
if (node != null && !doingLayout)
{
int count = hiddenNodesSet.Count;
foreach (var parentEdge in filteredGraphWrapper.WrappedGraph.InEdgesAt(node))
{
var parent = parentEdge.GetSourceNode();
if (hiddenNodesSet.Remove(parent))
{
filteredGraphWrapper.WrappedGraph.SetNodeCenter(parent, node.Layout.GetCenter());
filteredGraphWrapper.WrappedGraph.ClearBends(parentEdge);
}
}
await RefreshLayout(count, node);
}
}
/// <summary>
/// Handler for the <see cref="ShowChildrenCommand"/>
/// </summary>
public async void ShowChildrenExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = (e.Parameter ?? graphControl.CurrentItem) as INode;
if (node != null && !doingLayout)
{
int count = hiddenNodesSet.Count;
foreach (var childEdge in filteredGraphWrapper.WrappedGraph.OutEdgesAt(node))
{
var child = childEdge.GetTargetNode();
if (hiddenNodesSet.Remove(child))
{
filteredGraphWrapper.WrappedGraph.SetNodeCenter(child, node.Layout.GetCenter());
filteredGraphWrapper.WrappedGraph.ClearBends(childEdge);
}
}
await RefreshLayout(count, node);
}
}
/// <summary>
/// Handler for the <see cref="HideParentCommand"/>
/// </summary>
private async void HideParentExecuted(object sender, ExecutedCommandEventArgs e)
{
var node = (e.Parameter ?? graphControl.CurrentItem) as INode;
if (node != null && !doingLayout)
{
int count = hiddenNodesSet.Count;
foreach (var testNode in filteredGraphWrapper.WrappedGraph.Nodes)
{
if (testNode != node && filteredGraphWrapper.Contains(testNode) &&
filteredGraphWrapper.InDegree(testNode) == 0)
{
// this is a root node - remove it and all children unless
HideAllExcept(testNode, node);
}
}
await RefreshLayout(count, node);
}
}
/// <summary>
/// Custom command handler that allows toggling the selection state of an item
/// respecting the single selection policy.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ToggleItemSelectionExecuted(object sender, ExecutedCommandEventArgs e)
{
// get the item
var modelItem = (e.Parameter as IModelItem) ?? graphControl.CurrentItem;
var inputMode = (GraphEditorInputMode)graphControl.InputMode;
// check if it allowed to be selected
if (modelItem != null && graphControl.Graph.Contains(modelItem) && inputMode.SelectableItems.Is(modelItem))
{
var isSelected = inputMode.GraphSelection.IsSelected(modelItem);
if (isSelected)
{
// the item is selected and needs to be unselected - just clear the selection
inputMode.GraphSelection.Clear();
}
else
{
// the items is unselected - unselect all other items and select the currentItem
inputMode.GraphSelection.Clear();
inputMode.SetSelected(modelItem, true);
}
e.Handled = true;
}
}
/// <summary>
/// Paste implementation that uses a filter delegate to copy only nodes and labels as well as a different paste offset.
/// </summary>
/// <remarks>The customized paste operations (i.e. label text change) from <see cref="TaggedNodeClipboardHelper"/>
/// will still be used.</remarks>
private void OnPasteSpecialCommandExecuted(object sender, ExecutedCommandEventArgs executedCommandEventArgs)
{
var control = (GraphControl)sender;
GraphClipboard clipboard = control.Clipboard;
// Clear the old selection.
control.Selection.Clear();
// This is the filter delegate for the Paste call.
Predicate <IModelItem> filter = item => item is INode || (item is ILabel && ((ILabel)item).Owner is INode);
// This delegate is executed for every pasted element. We use it to select the pasted nodes.
ElementCopiedCallback pasted =
delegate(IModelItem originalItem, IModelItem pastedItem) {
if (pastedItem is INode)
{
control.Selection.SetSelected(pastedItem, true);
}
};
clipboard.Paste(control.Graph, filter, pasted);
// The next paste location should be shifted a little (just like the normal paste)
clipboard.PasteDelta += ((GraphEditorInputMode)graphControl.InputMode).PasteDelta;
}
private void NextPage_Executed(object sender, ExecutedCommandEventArgs e)
{
SetPageNumber(pageNumber + 1, null);
}
private void PreviousPage_Executed(object sender, ExecutedCommandEventArgs e)
{
SetPageNumber(pageNumber - 1, null);
}