/// <summary>
/// Pass mouse up to appropriate item
/// </summary>
/// <param name="e"></param>
public override bool OnMouseUp(VCItem sender, ItemMouseEventArgs e)
{
var pt = e.Location;
if (mouseDownPlacement != null)
{
try
{
var localPt = mouseDownPlacement.ToLocal(pt);
return(mouseDownPlacement.Item.OnMouseUp(new ItemMouseEventArgs(e, localPt.X, localPt.Y)));
}
finally
{
mouseDownPlacement = null;
}
}
else
{
VCItemPlacement placement = null;
while ((placement = container.Items.Find(pt, placement)) != null)
{
var localPt = placement.ToLocal(pt);
if (placement.Item.OnMouseUp(new ItemMouseEventArgs(e, localPt.X, localPt.Y)))
{
return(true);
}
}
return(base.OnMouseUp(sender, e));
}
}
/// <summary>
/// Default ctor
/// </summary>
public MovingPlacement(VCItemPlacement placement)
{
this.placement = placement;
startLocation = placement.Location;
newLocation = startLocation;
lastCommitLocation = startLocation;
}
/// <summary>
/// Draw resize handles on the given placement
/// </summary>
/// <param name="e"></param>
/// <param name="placement"></param>
private void DrawResizeHandles(ItemPaintEventArgs e, VCItemPlacement placement)
{
if ((placement == activePlacement) && CanResize(placement))
{
Graphics g = e.Graphics;
handleSize = (int)(DEFAULT_HANDLE_SIZE / e.ZoomFactor);
int d = -handleSize / 2;
int s = handleSize;
Size sz = placement.Item.Size;
Brush brush = Brushes.Red;
// Top-left
g.FillRectangle(brush, d, d, s, s);
// Top-right
g.FillRectangle(brush, sz.Width + d, d, s, s);
// Bottom-left
g.FillRectangle(brush, d, sz.Height + d, s, s);
// Bottom-right
g.FillRectangle(brush, sz.Width + d, sz.Height + d, s, s);
// Top-center
g.FillRectangle(brush, (sz.Width / 2) + d, d, s, s);
// Bottom-center
g.FillRectangle(brush, (sz.Width / 2) + d, sz.Height + d, s, s);
// Left-middle
g.FillRectangle(brush, d, (sz.Height / 2) + d, s, s);
// Right-middle
g.FillRectangle(brush, sz.Width + d, (sz.Height / 2) + d, s, s);
}
}
/// <summary>
/// Can the given item placement be resized.
/// Override this method to block items from being resized.
/// </summary>
protected override bool CanResize(VCItemPlacement placement)
{
var item = placement.Item as IPositionedEntityItem;
var entity = (item != null) ? item.Entity : null;
return((entity != null) && (!entity.Locked) && (!(entity is ISensor) && (!(entity is ISignal))));
}
/// <summary>
/// Gets the constraints from the given placement or an automatic constraints in case
/// the placement has not table constraints.
/// </summary>
/// <param name="placement"></param>
/// <param name="lastConstraints"></param>
/// <returns></returns>
private TableLayoutConstraints GetConstrains(VCItemPlacement placement, TableLayoutConstraints lastConstraints)
{
TableLayoutConstraints constraints = placement.Constraints as TableLayoutConstraints;
if (constraints != null)
{
return(constraints);
}
// Auto generate constraints
if (lastConstraints == null)
{
return(new TableLayoutConstraints(0, 0));
}
else
{
int col = lastConstraints.ColumnIndex + lastConstraints.ColumnSpan;
// Next col ok?
if (col < colFills.Length)
{
return(new TableLayoutConstraints(col, lastConstraints.RowIndex));
}
// Next row ok?
int row = lastConstraints.RowIndex + lastConstraints.RowSpan;
if (row < rowsFills.Length)
{
return(new TableLayoutConstraints(0, row));
}
// Overflow, restart
return(new TableLayoutConstraints(0, 0));
}
}
/// <summary>
/// Handle mouse leaves.
/// </summary>
/// <param name="e"></param>
public override void OnMouseLeave(VCItem sender, EventArgs e)
{
if (mouseOverPlacement != null)
{
mouseOverPlacement.Item.OnMouseLeave(e);
mouseOverPlacement = null;
}
base.OnMouseLeave(sender, e);
}
/// <summary>
/// Occurs when an object is dragged out of the item's bounds.
/// </summary>
/// <param name="e"></param>
public override void OnDragLeave(VCItem sender, EventArgs e)
{
if (dragOverPlacement != null)
{
dragOverPlacement.Item.OnDragLeave(e);
dragOverPlacement = null;
}
base.OnDragLeave(sender, e);
}
/// <summary>
/// Adjust the bounds of the given placement.
/// </summary>
protected override void Move(VCItemPlacement placement, int dx, int dy)
{
var item = placement.Item as IPositionedEntityItem;
if (item != null)
{
item.Entity.X += dx;
item.Entity.Y += dy;
}
}
/// <summary>
/// Stop resizing when mouse leaves the container
/// </summary>
/// <param name="e"></param>
public override void OnMouseLeave(VCItem sender, EventArgs e)
{
base.OnMouseLeave(sender, e);
resizing = false;
if (activePlacement != null)
{
activePlacement = null;
container.Invalidate();
}
}
/// <summary>
/// Adjust the bounds of the given placement.
/// </summary>
protected override void Resize(VCItemPlacement placement, Rectangle newBounds)
{
var item = placement.Item as IPositionedEntityItem;
if (item != null)
{
item.Entity.X = newBounds.Left;
item.Entity.Y = newBounds.Top;
item.Entity.Width = newBounds.Width;
item.Entity.Height = newBounds.Height;
base.Resize(placement, newBounds);
}
}
/// <summary>
/// Pass mouse move to appropriate item
/// </summary>
/// <param name="e"></param>
public override bool OnMouseMove(VCItem sender, ItemMouseEventArgs e)
{
var pt = e.Location;
if (mouseDownPlacement != null)
{
// Mouse button down, always send events to same placement
var localPt = mouseDownPlacement.ToLocal(pt);
return(mouseDownPlacement.Item.OnMouseMove(new ItemMouseEventArgs(e, localPt.X, localPt.Y)));
}
else
{
VCItemPlacement placement = container.Items.Find(pt, null);
// Handle mouse leave
if ((mouseOverPlacement != null) && (mouseOverPlacement != placement))
{
mouseOverPlacement.Item.OnMouseLeave(EventArgs.Empty);
mouseOverPlacement = null;
}
while (placement != null)
{
// Convert point to local
var localPt = placement.ToLocal(pt);
// Handle mouse enter
if (mouseOverPlacement == null)
{
mouseOverPlacement = placement;
mouseOverPlacement.Item.OnMouseEnter(EventArgs.Empty);
}
// Send mouse move
mouseOverPlacement = placement;
if (placement.Item.OnMouseMove(new ItemMouseEventArgs(e, localPt.X, localPt.Y)))
{
return(true);
}
placement = container.Items.Find(pt, placement);
if ((placement != mouseOverPlacement) && (placement != null))
{
mouseOverPlacement.Item.OnMouseLeave(EventArgs.Empty);
mouseOverPlacement = null;
}
}
return(base.OnMouseMove(sender, e));
}
}
/// <summary>
/// Can the given item placement be selected.
/// Override this method to block items from being selected.
/// </summary>
protected override bool CanSelect(VCItemPlacement placement)
{
if (!(placement.Item is IPositionedEntityItem))
{
return(false);
}
var moduleItem = placement.Item as ModuleEditItem;
if (moduleItem != null)
{
return(!moduleItem.ContentsEditable);
}
return(true);
}
/// <summary>
/// Calculate what side or corner or the placement the given point touches.
/// </summary>
/// <param name="placement"></param>
/// <param name="pt"></param>
/// <returns></returns>
private HitSide CalcHitSide(VCItemPlacement placement, PointF pt)
{
if (placement == null)
{
return(HitSide.None);
}
Rectangle bounds = placement.Bounds;
int max = handleSize;
var topDist = Math.Abs(bounds.Top - pt.Y);
var bottomDist = Math.Abs(bounds.Bottom - pt.Y);
var leftDist = Math.Abs(bounds.Left - pt.X);
var rightDist = Math.Abs(bounds.Right - pt.X);
if (topDist <= max)
{
if (leftDist <= max)
{
return(HitSide.Top | HitSide.Left);
}
if (rightDist <= max)
{
return(HitSide.Top | HitSide.Right);
}
return(HitSide.Top);
}
else if (bottomDist <= max)
{
if (leftDist <= max)
{
return(HitSide.Bottom | HitSide.Left);
}
if (rightDist <= max)
{
return(HitSide.Bottom | HitSide.Right);
}
return(HitSide.Bottom);
}
else if (leftDist <= max)
{
return(HitSide.Left);
}
else if (rightDist <= max)
{
return(HitSide.Right);
}
return(HitSide.None);
}
/// <summary>
/// Occurs when a drag-and-drop operation is completed.
/// </summary>
/// <param name="e"></param>
public override bool OnDragDrop(VCItem sender, ItemDragEventArgs e)
{
var pt = new Point(e.X, e.Y);
VCItemPlacement placement = null;
while ((placement = container.Items.Find(pt, placement)) != null)
{
Point localPt = placement.ToLocal(pt);
if (placement.Item.OnDragDrop(new ItemDragEventArgs(e, localPt.X, localPt.Y)))
{
return(true);
}
}
return(base.OnDragDrop(sender, e));
}
/// <summary>
/// Pass mouse double click to appropriate item
/// </summary>
/// <param name="e"></param>
public override bool OnMouseDoubleClick(VCItem sender, ItemMouseEventArgs e)
{
var pt = e.Location;
VCItemPlacement placement = null;
while ((placement = container.Items.Find(pt, placement)) != null)
{
var localPt = placement.ToLocal(pt);
if (placement.Item.OnMouseDoubleClick(new ItemMouseEventArgs(e, localPt.X, localPt.Y)))
{
return(true);
}
}
return(base.OnMouseDoubleClick(sender, e));
}
/// <summary>
/// Pass mouse move to appropriate item
/// </summary>
/// <param name="e"></param>
public override bool OnMouseMove(VCItem sender, ItemMouseEventArgs e)
{
var pt = e.Location;
if (resizing)
{
var rect = CalcResizedBounds(startBounds, startMousePt, LimitMoveToPosition(pt), startSide);
Resize(activePlacement, rect);
container.Invalidate();
return(true);
}
else if (e.Button == MouseButtons.None)
{
VCItemPlacement placement = Find(pt, null);
// Can placement be resized?
if ((placement != null) && (placement != activePlacement) && !CanResize(placement))
{
// No, it cannot be resized
placement = null;
}
HitSide hitSide = HitSide.None;
if ((placement != null) || (activePlacement != null))
{
hitSide = CalcHitSide(placement, pt);
if (hitSide != HitSide.None)
{
e.Cursor = GetCursor(hitSide);
}
}
if (activePlacement != placement)
{
activePlacement = placement;
container.Invalidate();
}
if (hitSide != HitSide.None)
{
return(true);
}
}
return(base.OnMouseMove(sender, e));
}
/// <summary>
/// Occurs when an object is dragged over the item's bounds.
/// </summary>
/// <param name="e"></param>
public override bool OnDragOver(VCItem sender, ItemDragEventArgs e)
{
var pt = new Point(e.X, e.Y);
VCItemPlacement placement = container.Items.Find(pt, null);
// Handle drag leave
if ((dragOverPlacement != null) && (dragOverPlacement != placement))
{
dragOverPlacement.Item.OnDragLeave(EventArgs.Empty);
dragOverPlacement = null;
}
while (placement != null)
{
// Convert point to local
Point localPt = placement.ToLocal(pt);
// Handle drag enter
if (dragOverPlacement == null)
{
dragOverPlacement = placement;
dragOverPlacement.Item.OnDragEnter(EventArgs.Empty);
}
// Send drag over
dragOverPlacement = placement;
if (placement.Item.OnDragOver(new ItemDragEventArgs(e, localPt.X, localPt.Y)))
{
return(true);
}
placement = container.Items.Find(pt, placement);
if ((placement != dragOverPlacement) && (placement != null))
{
dragOverPlacement.Item.OnDragLeave(EventArgs.Empty);
dragOverPlacement = null;
}
}
return(base.OnDragOver(sender, e));
}
/// <summary>
/// Pass mouse down to appropriate item
/// </summary>
/// <param name="e"></param>
public override bool OnMouseDown(VCItem sender, ItemMouseEventArgs e)
{
var pt = e.Location;
var placement = Find(pt, null);
// Can placement be resized?
if ((placement != null) && (placement != activePlacement) && !CanResize(placement))
{
// No, it cannot be resized
placement = null;
}
HitSide side = HitSide.None;
if (placement != null)
{
side = CalcHitSide(placement, pt);
if (side == HitSide.None)
{
placement = null;
}
}
if (placement != null)
{
activePlacement = placement;
startBounds = placement.Bounds;
startMousePt = pt;
startSide = side;
resizing = true;
container.Invalidate();
return(true);
}
else
{
// Pass event on
return(base.OnMouseDown(sender, e));
}
}
/// <summary>
/// Adjust the bounds of the given placement.
/// </summary>
/// <param name="placement"></param>
/// <param name="newBounds"></param>
protected virtual void Resize(VCItemPlacement placement, Rectangle newBounds)
{
activePlacement.Bounds = newBounds;
}
/// <summary>
/// Can the given item placement be moved.
/// Override this method to block items from being moved.
/// </summary>
protected override bool CanMove(VCItemPlacement placement)
{
var item = placement.Item as IPositionedEntityItem;
return((item != null) && !item.Entity.Locked);
}
/// <summary>
/// Can the given item placement be resized.
/// Override this method to block items from being resized.
/// </summary>
/// <param name="placement"></param>
/// <returns></returns>
protected virtual bool CanResize(VCItemPlacement placement)
{
return(true);
}
/// <summary>
/// Can the given item placement be selected.
/// Override this method to block items from being selected.
/// </summary>
protected virtual bool CanSelect(VCItemPlacement placement)
{
return(true);
}
/// <summary>
/// Find the placement to resize at the given virtual point.
/// </summary>
/// <param name="pt"></param>
/// <returns></returns>
private VCItemPlacement Find(PointF pt, VCItemPlacement after)
{
// This can be smarter so it also finds items the mouse is (a bit) outside of.
return(container.Items.Find(pt, after));
}
/// <summary> /// Adjust the bounds of the given placement. /// </summary> protected abstract void Move(VCItemPlacement placement, int dx, int dy);
