protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (!e.Handled)
{
// Order of operations:
// if marquee dragging
// - apply delta to marquee
// - test all components to see if they are within the marquee and set selection accordingly.
// else if move dragging
// - apply delta to all selected items
// if we've started a drag
if (m_dragStartPoint.HasValue)
{
e.Handled = true;
Point currentPoint = e.GetPosition(GraphLayout);
// if the marquee is visible, then we're doing a marquee selection.
if (MarqueeAdorner.Visibility != System.Windows.Visibility.Collapsed)
{
var left = Math.Min(m_dragStartPoint.Value.X, currentPoint.X);
var top = Math.Min(m_dragStartPoint.Value.Y, currentPoint.Y);
var right = Math.Max(m_dragStartPoint.Value.X, currentPoint.X);
var bottom = Math.Max(m_dragStartPoint.Value.Y, currentPoint.Y);
// If the user has moved the mouse at all, then show the selection box.
if (right != left || bottom != top)
{
MarqueeAdorner.Visibility = System.Windows.Visibility.Visible;
}
MarqueeAdorner.SetValue(Canvas.LeftProperty, left);
MarqueeAdorner.SetValue(Canvas.TopProperty, top);
MarqueeAdorner.Width = right - left;
MarqueeAdorner.Height = bottom - top;
Rect marqueeBounds = new Rect(new Point(left, top), new Point(right, bottom));
foreach (GraphSharp.Controls.VertexControl potentialSelectedVertex in GraphLayout.GetAllVertexControls())
{
Rect vertexBounds = new Rect(new Point(potentialSelectedVertex.TopLeftX, potentialSelectedVertex.TopLeftY), new Size(potentialSelectedVertex.ActualWidth, potentialSelectedVertex.ActualHeight));
if (marqueeBounds.IntersectsWith(vertexBounds))
{
SetIsSelected(potentialSelectedVertex, true);
}
else
{
SetIsSelected(potentialSelectedVertex, false);
}
}
}
else
{
Vector delta = currentPoint - m_lastDragPoint.Value;
foreach (GraphSharp.Controls.VertexControl potentialSelectedVertex in s_selectedVertices)
{
potentialSelectedVertex.CenterX += delta.X;
potentialSelectedVertex.CenterY += delta.Y;
}
}
m_lastDragPoint = currentPoint;
}
}
}
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
if (e.Handled != true)
{
// Hit-test order of operations
// if hit: button
// - this must happen first so that button presses do not start a drag-behaviour.
// - do nothing
// - return
// if hit: vertex info
// - do nothing
// if hit: connection between vertexes
// - do nothing
// if hit: vertex
// - select vertex (if not selected)
// - prepare to start dragging
// if hit: empty
// - prepare marquee draw box
// - prepare to start dragging
bool shouldStartDragging = true;
var hitElement = InputHitTest(e.GetPosition(this)) as DependencyObject;
if (hitElement != null)
{
// If the user clicked on a button, then we don't want to do anything (let the button handle all the processing)
if (hitElement.GetParent <Button>(this) != null)
{
shouldStartDragging = false;
}
// If the user clicked on an info panel, then we don't want to do anything (they exist "above" the graph and cannot be selected in the same way.)
if (shouldStartDragging == true && hitElement.GetParent <TraceLab.UI.WPF.Views.Nodes.NodeInfoContainer>(this) != null)
{
shouldStartDragging = false;
}
// If the user clicked on an edge - do nothing, let the edge handle everything.
if (shouldStartDragging == true && hitElement.GetParent <GraphSharp.Controls.EdgeControl>(this) != null)
{
shouldStartDragging = false;
}
// We're definitely going to start dragging _something_ - either the marquee or the current selection.
if (shouldStartDragging == true)
{
e.Handled = true;
m_dragStartPoint = e.GetPosition(GraphLayout);
m_lastDragPoint = m_dragStartPoint.Value;
var hitVertex = hitElement.GetParent <GraphSharp.Controls.VertexControl>(this);
if (hitVertex != null)
{
// 1) if vertex is not already selected, then clear selection and select this vertex.
if ((bool)hitVertex.GetValue(GraphView.IsSelectedProperty) == false)
{
UnselectAll();
SetIsSelected(hitVertex, true);
}
// 2) Begin dragging of entire selection
// - nothing special needs to happen here, since we're prepared to start dragging
// - and "marquee" dragging only happens if the marquee is NOT collapsed.
}
else
{
// Begin dragging marquee
MarqueeAdorner.SetValue(Canvas.LeftProperty, m_dragStartPoint.Value.Y);
MarqueeAdorner.SetValue(Canvas.TopProperty, m_dragStartPoint.Value.Y);
MarqueeAdorner.Width = 1;
MarqueeAdorner.Height = 1;
MarqueeAdorner.Visibility = System.Windows.Visibility.Hidden;
// Clear the selection in preparation.
UnselectAll();
}
}
}
// Take focus
Focus();
}
}