internal static bool CouldStartResize(Control control, MouseEventArgs e)
{
if (!resizables.TryGetValue(control, out ResizingData resizingData))
{
return(false);
}
PossibleResizingDirection prd = getPossibleResizingDirection(control, e);
return((prd.horizontal != ResizingDirection.NoResizing) || (prd.vertical != ResizingDirection.NoResizing));
}
static void control_MouseMove(object sender, MouseEventArgs e)
{
Control typedSender = (Control)sender;
ResizingData resizingData = resizables[typedSender];
if ((resizingData.verticalCurrent == ResizingDirection.NoResizing) && (resizingData.horizontalCurrent == ResizingDirection.NoResizing))
{ // Cursor and start
Cursor newCursor = null;
PossibleResizingDirection prd = getPossibleResizingDirection(typedSender, e);
if ((prd.vertical == prd.horizontal) && (prd.vertical != ResizingDirection.NoResizing))
{
newCursor = Cursors.SizeNWSE;
}
else if ((prd.vertical != prd.horizontal) && (prd.vertical != ResizingDirection.NoResizing) && (prd.horizontal != ResizingDirection.NoResizing))
{
newCursor = Cursors.SizeNESW;
}
else if (prd.vertical != ResizingDirection.NoResizing)
{
newCursor = Cursors.SizeNS;
}
else if (prd.horizontal != ResizingDirection.NoResizing)
{
newCursor = Cursors.SizeWE;
}
if (newCursor != null)
{
if (!resizingData.resizingCursor)
{
resizingData.originalCursor = typedSender.Cursor;
}
resizingData.resizingCursor = true;
typedSender.Cursor = newCursor;
}
else
{
resizingData.resizingCursor = false;
typedSender.Cursor = resizingData.originalCursor;
}
}
else
{ // Resizing
Point newMouseOffset = (e.Location - mouseOffset) + new Size(typedSender.Location - new Size(resizingData.originalLocation));
SizeChange scH = getNewSize(resizingData.horizontalCurrent, resizingData.originalSize.Width, newMouseOffset.X, resizingData.minWidth, resizingData.maxWidth);
SizeChange scV = getNewSize(resizingData.verticalCurrent, resizingData.originalSize.Height, newMouseOffset.Y, resizingData.minHeight, resizingData.maxHeight);
typedSender.Width = scH.newSize;
typedSender.Height = scV.newSize;
typedSender.Location = resizingData.originalLocation + new Size(scH.locationDelta, scV.locationDelta);
}
}
static void control_MouseDown(object sender, MouseEventArgs e)
{
Control typedSender = (Control)sender;
PossibleResizingDirection prd = getPossibleResizingDirection(typedSender, e);
if ((prd.vertical != ResizingDirection.NoResizing) || (prd.horizontal != ResizingDirection.NoResizing))
{
mouseOffset = new Size(e.Location);
ResizingData resizingData = resizables[typedSender];
resizingData.originalLocation = typedSender.Location;
resizingData.originalSize = typedSender.Size;
resizingData.verticalCurrent = prd.vertical;
resizingData.horizontalCurrent = prd.horizontal;
}
}
private static PossibleResizingDirection getPossibleResizingDirection(Control control, MouseEventArgs e)
{
PossibleResizingDirection result = new PossibleResizingDirection()
{
vertical = ResizingDirection.NoResizing,
horizontal = ResizingDirection.NoResizing
};
if (!resizables.TryGetValue(control, out ResizingData resizingData))
{
return(result);
}
int diffLeft = e.Location.X;
int diffRight = Math.Abs(control.Width - 1 - e.Location.X);
int diffTop = e.Location.Y;
int diffBottom = Math.Abs(control.Height - 1 - e.Location.Y);
if (diffLeft <= RESIZE_ACCURACY)
{
result.horizontal = ResizingDirection.ResizingReverse;
}
else if (diffRight <= RESIZE_ACCURACY)
{
result.horizontal = ResizingDirection.ResizingForward;
}
if (diffTop <= RESIZE_ACCURACY)
{
result.vertical = ResizingDirection.ResizingReverse;
}
else if (diffBottom <= RESIZE_ACCURACY)
{
result.vertical = ResizingDirection.ResizingForward;
}
result.vertical &= resizingData.verticalAllowed;
result.horizontal &= resizingData.horizontalAllowed;
return(result);
}