protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
controlMouseMoveLocation = e.Location;
bool needsRefresh = false;
LayoutProperties layoutProperties = new LayoutProperties();
layoutProperties.DesignAreaLocation = DesignAreaLocation;
layoutProperties.DesignAreaSize = DesignAreaSize;
layoutProperties.ViewportLocation = ViewportLocation;
layoutProperties.ViewportSize = ViewportSize;
layoutProperties.ZoomRatio = ZoomRatio;
layoutProperties.ControlMouseDownLocation = controlMouseDownLocation;
layoutProperties.ControlMouseMoveLocation = controlMouseMoveLocation;
if (selectedElements != null)
{
foreach (LayoutElement selectedElement in selectedElements)
{
TransformHandle handle = DesignerHelper.GetTransformHandleType(selectedElement, layoutProperties, controlMouseMoveLocation);
Cursor = DesignerHelper.GetCursorForTransformHandle(handle);
}
}
if (isMouseDown)
{
// move
if (interactionState == InteractionState.None && mouseHitsSelection && DesignerHelper.ExceedsThreshold(controlMouseMoveLocation, controlMouseDownLocation, MOVE_THRESHOLD))
{
interactionState = InteractionState.Move;
// store offsets by mouse location
selectedElementOffsets = new List <Point>();
foreach (LayoutElement selectedElement in selectedElements)
{
Point selectedElementLocation = selectedElement.Location.Multiply(ZoomRatio);
selectedElementLocation = selectedElementLocation.Add(DesignAreaLocation);
selectedElementLocation = selectedElementLocation.Subtract(ViewportLocation);
selectedElementOffsets.Add(new Point(controlMouseMoveLocation.X - selectedElementLocation.X,
controlMouseMoveLocation.Y - selectedElementLocation.Y));
}
}
if (interactionState == InteractionState.SizeAttempt && DesignerHelper.ExceedsThreshold(controlMouseMoveLocation, controlMouseDownLocation, SIZE_THRESHOLD))
{
interactionState = InteractionState.Size;
interactionLocation = SelectedElement.Location;
interactionSize = SelectedElement.Size;
needsRefresh = true;
}
if (interactionState == InteractionState.Move)
{
for (int i = 0; i < selectedElements.Count; i++)
{
LayoutElement selectedElement = selectedElements[i];
Point selectedElementOffset = selectedElementOffsets[i];
int selectedElementX = controlMouseMoveLocation.X + ViewportLocation.X - DesignAreaLocation.X;
selectedElementX -= selectedElementOffset.X;
int selectedElementY = controlMouseMoveLocation.Y + ViewportLocation.Y - DesignAreaLocation.Y;
selectedElementY -= selectedElementOffset.Y;
selectedElement.Location = new Point(selectedElementX, selectedElementY).Divide(ZoomRatio);
}
needsRefresh = true;
}
if (interactionState == InteractionState.Size)
{
int locationX = interactionLocation.X;
int locationY = interactionLocation.Y;
int sizeWidth = interactionSize.Width;
int sizeHeight = interactionSize.Height;
if (!KeyboardHelper.IsShiftKeyPressed)
{
if (transformHandle == TransformHandle.TopLeft)
{
locationX = DesignAreaMouseMoveLocation.X;
locationY = DesignAreaMouseMoveLocation.Y;
sizeWidth = interactionLocation.X + interactionSize.Width - DesignAreaMouseMoveLocation.X;
sizeHeight = interactionLocation.Y + interactionSize.Height - DesignAreaMouseMoveLocation.Y;
}
else if (transformHandle == TransformHandle.TopCenter)
{
locationX = interactionLocation.X;
locationY = DesignAreaMouseMoveLocation.Y;
sizeWidth = interactionSize.Width;
sizeHeight = interactionLocation.Y + interactionSize.Height - DesignAreaMouseMoveLocation.Y;
}
else if (transformHandle == TransformHandle.TopRight)
{
locationX = interactionLocation.X;
locationY = DesignAreaMouseMoveLocation.Y;
sizeWidth = DesignAreaMouseMoveLocation.X - interactionLocation.X;
sizeHeight = interactionLocation.Y + interactionSize.Height - DesignAreaMouseMoveLocation.Y;
}
else if (transformHandle == TransformHandle.Left)
{
locationX = DesignAreaMouseMoveLocation.X;
locationY = interactionLocation.Y;
sizeWidth = interactionLocation.X + interactionSize.Width - DesignAreaMouseMoveLocation.X;
sizeHeight = interactionSize.Height;
}
else if (transformHandle == TransformHandle.Right)
{
sizeWidth = DesignAreaMouseMoveLocation.X - interactionLocation.X;
}
else if (transformHandle == TransformHandle.BottomLeft)
{
locationX = DesignAreaMouseMoveLocation.X;
locationY = interactionLocation.Y;
sizeWidth = interactionLocation.X + interactionSize.Width - DesignAreaMouseMoveLocation.X;
sizeHeight = DesignAreaMouseMoveLocation.Y - interactionLocation.Y;
}
else if (transformHandle == TransformHandle.BottomCenter)
{
sizeHeight = DesignAreaMouseMoveLocation.Y - interactionLocation.Y;
}
else if (transformHandle == TransformHandle.BottomRight)
{
sizeWidth = DesignAreaMouseMoveLocation.X - interactionLocation.X;
sizeHeight = DesignAreaMouseMoveLocation.Y - interactionLocation.Y;
}
}
else
{
Point pA;
Point pK;
double m;
int pPX;
int pPY;
if (transformHandle == TransformHandle.TopLeft)
{
pA = new Point(interactionLocation.X + interactionSize.Width,
interactionLocation.Y + interactionSize.Height);
pK = DesignAreaMouseMoveLocation;
m = (double)interactionSize.Height / (double)interactionSize.Width;
pPX = (int)(((m * ((pA.X * m) - pA.Y + pK.Y)) + pK.X) / ((m * m) + 1));
pPY = (int)(((pPX - pA.X) * m) + pA.Y);
if (pA.X - pPX < SelectedElement.MinimumSize.Width)
{
locationX = pA.X - SelectedElement.MinimumSize.Width;
}
else
{
locationX = pPX;
}
if (pA.Y - pPY < SelectedElement.MinimumSize.Height)
{
locationY = pA.Y - SelectedElement.MinimumSize.Height;
}
else
{
locationY = pPY;
}
sizeWidth = pA.X - pPX;
sizeHeight = pA.Y - pPY;
}
else if (transformHandle == TransformHandle.TopRight)
{
pA = new Point(interactionLocation.X,
interactionLocation.Y + interactionSize.Height);
pK = DesignAreaMouseMoveLocation;
m = -(double)interactionSize.Height / (double)interactionSize.Width;
pPX = (int)(((m * ((pA.X * m) - pA.Y + pK.Y)) + pK.X) / ((m * m) + 1));
pPY = (int)(((pPX - pA.X) * m) + pA.Y);
if (pA.Y - pPY < SelectedElement.MinimumSize.Height)
{
locationY = pA.Y - SelectedElement.MinimumSize.Height;
}
else
{
locationY = pPY;
}
sizeWidth = pPX - pA.X;
sizeHeight = pA.Y - pPY;
}
else if (transformHandle == TransformHandle.BottomLeft)
{
pA = new Point(interactionLocation.X + interactionSize.Width,
interactionLocation.Y);
pK = DesignAreaMouseMoveLocation;
m = -(double)interactionSize.Height / (double)interactionSize.Width;
pPX = (int)(((m * ((pA.X * m) - pA.Y + pK.Y)) + pK.X) / ((m * m) + 1));
pPY = (int)(((pPX - pA.X) * m) + pA.Y);
if (pA.X - pPX < SelectedElement.MinimumSize.Width)
{
locationX = pA.X - SelectedElement.MinimumSize.Width;
}
else
{
locationX = pPX;
}
sizeWidth = pA.X - pPX;
sizeHeight = pPY - pA.Y;
}
else if (transformHandle == TransformHandle.BottomRight)
{
pA = new Point(interactionLocation.X,
interactionLocation.Y);
pK = DesignAreaMouseMoveLocation;
m = (double)interactionSize.Height / (double)interactionSize.Width;
pPX = (int)(((m * ((pA.X * m) - pA.Y + pK.Y)) + pK.X) / ((m * m) + 1));
pPY = (int)(((pPX - pA.X) * m) + pA.Y);
sizeWidth = pPX - pA.X;
sizeHeight = pPY - pA.Y;
}
}
if (locationX > interactionLocation.X + interactionSize.Width - SelectedElement.MinimumSize.Width)
{
locationX = interactionLocation.X + interactionSize.Width - SelectedElement.MinimumSize.Width;
}
if (locationY > interactionLocation.Y + interactionSize.Height - SelectedElement.MinimumSize.Height)
{
locationY = interactionLocation.Y + interactionSize.Height - SelectedElement.MinimumSize.Height;
}
if (locationX < interactionLocation.X + interactionSize.Width - SelectedElement.MaximumSize.Width)
{
locationX = interactionLocation.X + interactionSize.Width - SelectedElement.MaximumSize.Width;
}
if (locationY < interactionLocation.Y + interactionSize.Height - SelectedElement.MaximumSize.Height)
{
locationY = interactionLocation.Y + interactionSize.Height - SelectedElement.MaximumSize.Height;
}
if (sizeWidth < SelectedElement.MinimumSize.Width)
{
sizeWidth = SelectedElement.MinimumSize.Width;
}
if (sizeHeight < SelectedElement.MinimumSize.Height)
{
sizeHeight = SelectedElement.MinimumSize.Height;
}
if (sizeWidth > SelectedElement.MaximumSize.Width)
{
sizeWidth = SelectedElement.MaximumSize.Width;
}
if (sizeHeight > SelectedElement.MaximumSize.Height)
{
sizeHeight = SelectedElement.MaximumSize.Height;
}
SelectedElement.Location = new Point(locationX, locationY);
SelectedElement.Size = new Size(sizeWidth, sizeHeight);
needsRefresh = true;
}
// selection
if (interactionState == InteractionState.None && !mouseHitsSelection && DesignerHelper.ExceedsThreshold(controlMouseMoveLocation, controlMouseDownLocation, SELECTION_THRESHOLD))
{
interactionState = InteractionState.Selection;
needsRefresh = true;
}
if (interactionState == InteractionState.Selection)
{
needsRefresh = true;
}
if (interactionState == InteractionState.Pan)
{
ViewportLocation = oldViewportLocation.Subtract(controlMouseMoveLocation.Subtract(controlMouseDownLocation));
ValidateViewportLocation();
UpdateScrollBars();
needsRefresh = true;
}
}
if (needsRefresh)
{
Refresh();
}
}