protected override void OnMouseWheel(MouseWheelEventArgs e)
{
base.OnMouseWheel(e);
if (null == ViewModel)
{
return;
}
if (!_IsWheeling)
{
History.NodeGraphHistory history = ViewModel.Model.History;
history.BeginTransaction("Zooming");
_ZoomAndPanStartMatrix = ZoomAndPan.Matrix;
}
_WheelStartTime = _CurrentTime;
_IsWheeling = true;
double newScale = _ZoomAndPan.Scale;
newScale += (0.0 > e.Delta) ? -0.05 : 0.05;
newScale = Math.Max(0.1, Math.Min(1.0, newScale));
Point vsZoomCenter = e.GetPosition(this);
Point zoomCenter = _ZoomAndPan.MatrixInv.Transform(vsZoomCenter);
_ZoomAndPan.Scale = newScale;
Point vsNextZoomCenter = _ZoomAndPan.Matrix.Transform(zoomCenter);
Point vsDelta = new Point(vsZoomCenter.X - vsNextZoomCenter.X, vsZoomCenter.Y - vsNextZoomCenter.Y);
_ZoomAndPan.StartX -= vsDelta.X;
_ZoomAndPan.StartY -= vsDelta.Y;
}
protected override void OnMouseRightButtonDown(MouseButtonEventArgs e)
{
base.OnMouseRightButtonDown(e);
if (null == ViewModel)
{
return;
}
Keyboard.Focus(this);
_RightButtonDownPos = e.GetPosition(this);
_ZoomAndPanStartMatrix = ZoomAndPan.Matrix;
if (!NodeGraphManager.IsDragging)
{
_IsDraggingCanvas = true;
Mouse.Capture(this, CaptureMode.SubTree);
History.NodeGraphHistory history = ViewModel.Model.History;
history.BeginTransaction("Panning");
}
}
protected override void OnLostFocus(RoutedEventArgs e)
{
base.OnLostFocus(e);
if (null == ViewModel)
{
return;
}
NodeGraphManager.EndConnection();
NodeGraphManager.EndDragNode();
NodeGraphManager.EndDragSelection(true);
if (_IsDraggingCanvas)
{
_IsDraggingCanvas = false;
Mouse.Capture(null);
History.NodeGraphHistory history = ViewModel.Model.History;
history.EndTransaction(true);
}
}
/// <summary>
/// Never call this constructor directly. Use GraphManager.CreateFlowChart() method.
/// </summary>
public FlowChart(NodeGraphManager ngm, Guid guid) : base(guid)
{
NodeGraphManager = ngm;
History = new History.NodeGraphHistory(ngm, this, 100);
}
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
if (null == ViewModel)
{
return;
}
if (IsFocused)
{
if (Key.Delete == e.Key)
{
FlowChart flowChart = ViewModel.Model;
flowChart.History.BeginTransaction("Destroy Selected Nodes");
{
NodeGraphManager.DestroySelectedNodes(ViewModel.Model);
}
flowChart.History.EndTransaction(false);
}
else if (Key.Escape == e.Key)
{
FlowChart flowChart = ViewModel.Model;
flowChart.History.BeginTransaction("Destroy Selected Nodes");
{
NodeGraphManager.DeselectAllNodes(ViewModel.Model);
}
flowChart.History.EndTransaction(false);
}
else if (Key.A == e.Key)
{
if (Keyboard.IsKeyDown(Key.LeftCtrl))
{
NodeGraphManager.SelectAllNodes(ViewModel.Model);
}
else
{
FitNodesToView(false);
}
}
else if (Key.F == e.Key)
{
FitNodesToView(true);
}
else if (Key.Z == e.Key)
{
if (Keyboard.IsKeyDown(Key.LeftCtrl))
{
History.NodeGraphHistory history = ViewModel.Model.History;
history.Undo();
}
}
else if (Key.Y == e.Key)
{
if (Keyboard.IsKeyDown(Key.LeftCtrl))
{
History.NodeGraphHistory history = ViewModel.Model.History;
history.Redo();
}
}
}
}
private void Timer_Tick(object sender, EventArgs e)
{
_CurrentTime += _Timer.Interval.Milliseconds;
if (null == ViewModel)
{
return;
}
if (NodeGraphManager.IsDragging)
{
MouseArea area = CheckMouseArea();
if (MouseArea.None != area)
{
Point delta = new Point(0.0, 0.0);
if (MouseArea.Left == (area & MouseArea.Left))
{
delta.X = -10.0;
}
if (MouseArea.Right == (area & MouseArea.Right))
{
delta.X = 10.0;
}
if (MouseArea.Top == (area & MouseArea.Top))
{
delta.Y = -10.0;
}
if (MouseArea.Bottom == (area & MouseArea.Bottom))
{
delta.Y = 10.0;
}
Point mousePos = Mouse.GetPosition(this);
UpdateDragging(
new Point(mousePos.X + delta.X, mousePos.Y + delta.Y), // virtual mouse-position.
delta); // virtual delta.
_ZoomAndPan.StartX += delta.X;
_ZoomAndPan.StartY += delta.Y;
}
}
else if (_IsWheeling)
{
if (200 < (_CurrentTime - _WheelStartTime))
{
_IsWheeling = false;
History.NodeGraphHistory history = ViewModel.Model.History;
history.AddCommand(new History.ZoomAndPanCommand(
"ZoomAndPan", ViewModel.Model, _ZoomAndPanStartMatrix, ZoomAndPan.Matrix));
history.EndTransaction(false);
}
}
else
{
_CurrentTime = 0.0;
}
}
protected override void OnMouseRightButtonUp(MouseButtonEventArgs e)
{
base.OnMouseRightButtonUp(e);
if (null == ViewModel)
{
return;
}
NodeGraphManager.EndConnection();
NodeGraphManager.EndDragNode();
NodeGraphManager.EndDragSelection(true);
Point mousePos = e.GetPosition(this);
Point diff = new Point(
Math.Abs(_RightButtonDownPos.X - mousePos.X),
Math.Abs(_RightButtonDownPos.Y - mousePos.Y));
bool wasDraggingCanvas = (5.0 < diff.X) || (5.0 < diff.Y);
if (_IsDraggingCanvas)
{
_IsDraggingCanvas = false;
Mouse.Capture(null);
History.NodeGraphHistory history = ViewModel.Model.History;
if (wasDraggingCanvas)
{
history.AddCommand(new History.ZoomAndPanCommand(
"ZoomAndPan", ViewModel.Model, _ZoomAndPanStartMatrix, ZoomAndPan.Matrix));
history.EndTransaction(false);
}
else
{
history.EndTransaction(true);
}
}
if (!wasDraggingCanvas)
{
Point viewSpacePos;
Point modelSpacePos;
ModelType modelType;
ModelBase model = FindModelUnderMouse(mousePos, out viewSpacePos, out modelSpacePos, out modelType);
if (null != model)
{
BuildContextMenuArgs args = new BuildContextMenuArgs();
args.ViewSpaceMouseLocation = viewSpacePos;
args.ModelSpaceMouseLocation = modelSpacePos;
args.ModelType = modelType;
ContextMenu = new ContextMenu();
ContextMenu.Closed += ContextMenu_Closed;
args.ContextMenu = ContextMenu;
if (!NodeGraphManager.InvokeBuildContextMenu(model, args))
{
ContextMenu = null;
}
}
}
}
/// <summary>
/// Never call this constructor directly. Use GraphManager.CreateFlowChart() method.
/// </summary>
public FlowChart(Guid guid) : base(guid)
{
History = new History.NodeGraphHistory(this, 100);
}
