/// <summary>
/// Start using a <see cref="P:Northwoods.Go.GoToolDragging.DragSelection" />, creating it if needed, and moving the
/// originally selected objects back to their original position.
/// </summary>
/// <remarks>
/// This also sets <see cref="P:Northwoods.Go.GoTool.CurrentObject" /> to a corresponding
/// outline object in the drag selection, and remembers the original current
/// object in the <see cref="P:Northwoods.Go.GoToolDragging.DragSelectionOriginalObject" /> property. This
/// allows <see cref="M:Northwoods.Go.GoToolDragging.DoDragging(Northwoods.Go.GoInputState)" />to continue calculating move offsets based
/// on the position of the <see cref="P:Northwoods.Go.GoTool.CurrentObject" />, even though
/// the objects are part of the drag selection instead of the
/// original selected objects.
/// </remarks>
public virtual void MakeDragSelection()
{
if (DragSelection != null)
{
return;
}
DragSelectionOriginalObject = base.CurrentObject;
DragSelection = CreateDragSelection();
if (DragSelection == null || DragSelection.IsEmpty)
{
DragSelectionOriginalObject = null;
DragSelection = null;
return;
}
SizeF offset = GoTool.SubtractPoints(GoTool.SubtractPoints(base.FirstInput.DocPoint, MoveOffset), DragSelectionOriginalObject.Position);
if (offset.Width != 0f || offset.Height != 0f)
{
base.View.MoveSelection((EffectiveSelection != null) ? EffectiveSelection : base.Selection, offset, grid: false);
}
if (base.CurrentObject.View != base.View)
{
base.CurrentObject = DragSelection.Primary;
}
}
/// <summary>
/// This method is called repeatedly by <see cref="M:Northwoods.Go.GoBalloon.DoResize(Northwoods.Go.GoView,System.Drawing.RectangleF,System.Drawing.PointF,System.Int32,Northwoods.Go.GoInputState,System.Drawing.SizeF,System.Drawing.SizeF)" /> while
/// the user is dragging the <see cref="F:Northwoods.Go.GoBalloon.AnchorHandle" /> resize handle.
/// </summary>
/// <param name="p">the point (in document coordinates) currently specified by the user's mouse</param>
/// <param name="view"></param>
/// <param name="evttype"></param>
/// <remarks>
/// When <paramref name="evttype" /> is <c>GoInputState.</c><see cref="F:Northwoods.Go.GoInputState.Finish" />,
/// this calls <see cref="M:Northwoods.Go.GoView.PickObject(System.Boolean,System.Boolean,System.Drawing.PointF,System.Boolean)" /> to
/// find the selectable document object at the given point <paramref name="p" />.
/// The <see cref="P:Northwoods.Go.GoBalloon.Anchor" /> is set to that object.
/// If no object is found at that point, the <see cref="P:Northwoods.Go.GoBalloon.Anchor" /> is set to null
/// and the <see cref="P:Northwoods.Go.GoBalloon.UnanchoredOffset" /> is set to the offset between that
/// point and the <see cref="P:Northwoods.Go.GoComment.Label" />'s Position.
/// If the user tries to reanchor this balloon to itself, no change is made.
/// This method does nothing unless the <paramref name="evttype" /> is <see cref="F:Northwoods.Go.GoInputState.Finish" />.
/// </remarks>
protected virtual void PickNewAnchor(PointF p, GoView view, GoInputState evttype)
{
if (evttype != GoInputState.Finish)
{
return;
}
GoObject goObject = view.PickObject(doc: true, view: false, p, selectableOnly: true);
if (goObject == this)
{
return;
}
Anchor = goObject;
if (goObject == null)
{
if (Label != null)
{
UnanchoredOffset = GoTool.SubtractPoints(p, Label.Position);
}
else
{
UnanchoredOffset = GoTool.SubtractPoints(p, base.Position);
}
}
}
/// <summary>
/// Create a new selection object containing an image of all of the real selected objects.
/// </summary>
/// <returns>a new <see cref="T:Northwoods.Go.GoSelection" /> holding view objects that represent the
/// objects in the <see cref="P:Northwoods.Go.GoView.Selection" /></returns>
/// <remarks>
/// This creates a new <see cref="T:Northwoods.Go.GoSelection" /> for this view.
/// The objects that are in this selection have been added to the default
/// layer of the view.
/// </remarks>
public virtual GoSelection CreateDragSelection()
{
GoSelection goSelection = new GoSelection(null);
PointF position = base.CurrentObject.Position;
SizeF offset = GoTool.SubtractPoints(base.CurrentObject.Location, position);
GoDragRectangle goDragRectangle = new GoDragRectangle();
goDragRectangle.Bounds = base.CurrentObject.Bounds;
goDragRectangle.Offset = offset;
goDragRectangle.Visible = false;
base.View.Layers.Default.Add(goDragRectangle);
goSelection.Add(goDragRectangle);
GoCollection goCollection = new GoCollection();
goCollection.InternalChecksForDuplicates = false;
foreach (GoObject item in (EffectiveSelection != null) ? EffectiveSelection : base.Selection)
{
goCollection.Add(item.DraggingObject);
}
base.View.Document.Layers.SortByZOrder(goCollection);
RectangleF bounds = GoDocument.ComputeBounds(goCollection, base.View);
float num = 1E+21f;
float num2 = 1E+21f;
foreach (GoObject item2 in goCollection)
{
if (item2.Top < num)
{
num = item2.Top;
}
if (item2.Left < num2)
{
num2 = item2.Left;
}
}
float num3 = base.View.WorldScale.Width;
if (bounds.Width * num3 > 2000f || bounds.Height * num3 > 2000f)
{
num3 *= Math.Min(2000f / (bounds.Width * num3), 2000f / (bounds.Height * num3));
}
Bitmap bitmapFromCollection = base.View.GetBitmapFromCollection(goCollection, bounds, num3, paper: false);
GoDragImage goDragImage = new GoDragImage();
goDragImage.Image = bitmapFromCollection;
goDragImage.Bounds = new RectangleF(bounds.X, bounds.Y, (float)bitmapFromCollection.Width / num3, (float)bitmapFromCollection.Height / num3);
if (num < 1E+21f && num2 < 1E+21f)
{
goDragImage.Offset = new SizeF(num2 - bounds.X + offset.Width, num - bounds.Y + offset.Height);
}
else
{
goDragImage.Offset = offset;
}
base.View.Layers.Default.Add(goDragImage);
goSelection.Add(goDragImage);
return(goSelection);
}
/// <summary>
/// Cancelling a drag involves moving the selection back to the original position
/// before aborting the transaction.
/// </summary>
public override void DoCancelMouse()
{
if (base.CurrentObject != null && DragSelection == null)
{
SizeF offset = GoTool.SubtractPoints(GoTool.SubtractPoints(base.FirstInput.DocPoint, MoveOffset), base.CurrentObject.Position);
if (offset.Width != 0f || offset.Height != 0f)
{
base.View.MoveSelection((EffectiveSelection != null) ? EffectiveSelection : base.Selection, offset, grid: false);
}
}
base.TransactionResult = null;
StopTool();
}
/// <summary>
/// Perform the drag, for both moving and copying, including the final move or copy
/// on a mouse up event.
/// </summary>
/// <param name="evttype"></param>
/// <remarks>
/// Whether the drag is performing a move or a copy is determined by the
/// value of the <see cref="M:Northwoods.Go.GoToolDragging.MayBeCopying" /> and <see cref="M:Northwoods.Go.GoToolDragging.MayBeMoving" /> predicates.
/// This method is sensitive to the <see cref="P:Northwoods.Go.GoView.DragsRealtime" /> property.
/// When this property is false, dragging uses the <see cref="P:Northwoods.Go.GoToolDragging.DragSelection" />
/// selection instead of the normal <see cref="P:Northwoods.Go.GoView.Selection" /> collection.
/// It calls <see cref="M:Northwoods.Go.GoToolDragging.MakeDragSelection" /> to create the drag selection if needed
/// and then moves the drag selection.
/// When not copying and when <see cref="P:Northwoods.Go.GoView.DragsRealtime" /> is true, it calls
/// <see cref="M:Northwoods.Go.GoToolDragging.ClearDragSelection" /> to stop using any drag selection and then it
/// moves the regular <see cref="P:Northwoods.Go.GoView.Selection" />.
/// </remarks>
public virtual void DoDragging(GoInputState evttype)
{
if (base.CurrentObject == null)
{
return;
}
SizeF sizeF = GoTool.SubtractPoints(base.LastInput.DocPoint, base.CurrentObject.Position);
SizeF sizeF2 = new SizeF(sizeF.Width - MoveOffset.Width, sizeF.Height - MoveOffset.Height);
bool flag = MayBeCopying() && MustBeCopying();
bool flag2 = MayBeMoving();
DragEventArgs dragEventArgs = base.LastInput.DragEventArgs;
if (dragEventArgs != null && !base.View.IsInternalDragDrop(dragEventArgs))
{
flag = false;
}
if (EffectiveSelection == null)
{
myEffectiveSelection = ComputeEffectiveSelection(base.Selection, !flag);
}
if (evttype != GoInputState.Finish)
{
GoSelection goSelection = null;
if (flag || !base.View.DragsRealtime)
{
MakeDragSelection();
goSelection = DragSelection;
}
else if (flag2)
{
ClearDragSelection();
goSelection = EffectiveSelection;
}
if (goSelection != null)
{
GoObject goObject = null;
foreach (GoObject item in goSelection)
{
if (!(item is IGoLink) && item.CanMove())
{
goObject = item;
break;
}
}
SizeF offset = sizeF2;
if (goObject != null)
{
PointF location = goObject.Location;
PointF p = new PointF(location.X + sizeF2.Width, location.Y + sizeF2.Height);
p = base.View.SnapPoint(p, goObject);
offset.Width = p.X - location.X;
offset.Height = p.Y - location.Y;
}
base.View.MoveSelection(goSelection, offset, grid: false);
}
return;
}
SizeF offset2 = sizeF2;
if (DragSelection != null)
{
offset2 = GoTool.SubtractPoints(base.CurrentObject.Position, DragSelectionOriginalObject.Position);
ClearDragSelection();
}
if (flag)
{
if (CopiesEffectiveSelection)
{
myEffectiveSelection = ComputeEffectiveSelection(base.Selection, move: false);
base.View.CopySelection(EffectiveSelection, offset2, grid: true);
}
else
{
base.View.CopySelection(base.Selection, offset2, grid: true);
}
}
else if (flag2)
{
if (EffectiveSelection == null)
{
myEffectiveSelection = ComputeEffectiveSelection(base.Selection, move: true);
}
base.View.MoveSelection(EffectiveSelection, offset2, grid: true);
}
}
/// <summary>
/// Start a drag-and-drop operation.
/// </summary>
/// <remarks>
/// <para>
/// This first remembers the <see cref="P:Northwoods.Go.GoToolDragging.MoveOffset" /> between the <see cref="P:Northwoods.Go.GoTool.CurrentObject" />'s
/// position and the mouse point (the first input event point).
/// It removes any selection handles, so those do not need to be dragged along.
/// It also starts a transaction.
/// If the view's <see cref="P:Northwoods.Go.GoView.AllowDragOut" /> property is true, we call
/// <c>Control.DoDragDrop</c> to start the standard modal drag-and-drop process.
/// </para>
/// <para>
/// This depends on the cooperation of <see cref="M:Northwoods.Go.GoView.OnDragOver(System.Windows.Forms.DragEventArgs)" />, <see cref="M:Northwoods.Go.GoView.OnDragDrop(System.Windows.Forms.DragEventArgs)" />,
/// and <see cref="M:Northwoods.Go.GoView.OnQueryContinueDrag(System.Windows.Forms.QueryContinueDragEventArgs)" /> to call <see cref="M:Northwoods.Go.GoToolDragging.DoMouseMove" />,
/// <see cref="M:Northwoods.Go.GoToolDragging.DoMouseUp" />, and <see cref="M:Northwoods.Go.GoToolDragging.DoCancelMouse" /> appropriately when the
/// drop target is the same view as the drag source.
/// If the view's <see cref="P:Northwoods.Go.GoView.AllowDragOut" /> property is false, the
/// normal calls to <see cref="M:Northwoods.Go.GoToolDragging.DoMouseMove" />, <see cref="M:Northwoods.Go.GoToolDragging.DoMouseUp" />, and
/// <see cref="M:Northwoods.Go.GoToolDragging.DoCancelMouse" /> occur.
/// </para>
/// <para>
/// If <see cref="P:Northwoods.Go.GoToolDragging.SelectsWhenStarts" /> is false, this method does not
/// modify the current selection and does not set
/// <see cref="P:Northwoods.Go.GoTool.CurrentObject" /> or <see cref="P:Northwoods.Go.GoToolDragging.MoveOffset" />.
/// </para>
/// </remarks>
public override void Start()
{
if (SelectsWhenStarts)
{
base.CurrentObject = base.View.PickObject(doc: true, view: false, base.FirstInput.DocPoint, selectableOnly: true);
if (base.CurrentObject == null)
{
return;
}
MoveOffset = GoTool.SubtractPoints(base.FirstInput.DocPoint, base.CurrentObject.Position);
}
StartTransaction();
if (SelectsWhenStarts && !base.Selection.Contains(base.CurrentObject))
{
if (base.FirstInput.Shift || base.FirstInput.Control)
{
base.Selection.Add(base.CurrentObject);
}
else
{
base.Selection.Select(base.CurrentObject);
}
}
if (!base.View.DragRoutesRealtime && base.View.DragsRealtime)
{
base.View.Document.SuspendsRouting = true;
}
if (HidesSelectionHandles)
{
mySelectionHidden = true;
base.Selection.RemoveAllSelectionHandles();
}
if (base.View.AllowDragOut)
{
myModalDropped = false;
try
{
if (base.Selection.Primary != null)
{
SizeF hotSpot = GoTool.SubtractPoints(base.LastInput.DocPoint, base.Selection.Primary.Position);
base.Selection.HotSpot = hotSpot;
}
DoDragDrop(base.Selection, DragDropEffects.All);
}
catch (VerificationException ex)
{
GoObject.Trace("GoToolDragging Start: " + ex.ToString());
}
catch (SecurityException ex2)
{
GoObject.Trace("GoToolDragging Start: " + ex2.ToString());
}
finally
{
if (!myModalDropped)
{
DoCancelMouse();
}
else
{
StopTool();
}
base.Selection.HotSpot = default(SizeF);
}
}
}
