Make Object Follow Mouse On MouseDown and "Stick" On MouseUp - wpf

Question

I'm working with a project that is WPF and VB.net. I want to visually simulate "dragging" an object (though I do not want to use standard drag and drop for reason of purpose).
Basically, I have a label object that, on its MouseDown event, I want it to follow the mouse cursor inside a 640x480 solid-size grid (but not outside of it!). Mind you, this grid is centered inside a full-screen window. Again, the object should not follow the mouse outside of the grid (I'm guessing a "ClipToBounds = True" here)
Then, on the label's MouseUp event, I want it to either stay in its current position or return to its original position, as determined by the value of a boolean variable set by another object's MouseEnter property.
Note, if it would be easier to work with, I can change the grid to a canvas in a cinch. I'm guessing that would be desirable.
So, after that long-winded explanation, here is my question (two-fold):
How do I make the object (label) follow the mouse cursor inside the grid/canvas, but not outside of it? This needs to happen on the MouseDown event of the label.
How do I make the object "stick" in its current position? (From this, I can probably figure out how to make it return to its original position on my own. :D )
My upvote to whoever can help me accomplish this goal the most efficiently! Thank you all very much.

Answer 1

How about something like this :
XAML :
<Canvas x:Name="canv" ToolTip="tt one" Width="400" Height="400" Background="Blue">
<Rectangle x:Name="rec" Fill="Red" Height="50" Width="50" MouseDown="Rectangle_MouseDown" MouseMove="Rectangle_MouseMove" MouseUp="Rectangle_MouseUp" />
</Canvas>
CODE-BEHIND :
private bool isDragging;
private void Rectangle_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
rec.CaptureMouse();
isDragging = true;
}
private void Rectangle_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
{
if (isDragging)
{
Point canvPosToWindow = canv.TransformToAncestor(this).Transform(new Point(0, 0));
Rectangle r = sender as Rectangle;
var upperlimit = canvPosToWindow.Y + (r.Height / 2);
var lowerlimit = canvPosToWindow.Y + canv.ActualHeight - (r.Height / 2);
var leftlimit = canvPosToWindow.X + (r.Width / 2);
var rightlimit = canvPosToWindow.X + canv.ActualWidth - (r.Width / 2);
var absmouseXpos = e.GetPosition(this).X;
var absmouseYpos = e.GetPosition(this).Y;
if ((absmouseXpos > leftlimit && absmouseXpos < rightlimit)
&& (absmouseYpos > upperlimit && absmouseYpos < lowerlimit))
{
Canvas.SetLeft(r, e.GetPosition(canv).X - (r.Width / 2));
Canvas.SetTop(r, e.GetPosition(canv).Y - (r.Height / 2));
}
}
}
private void Rectangle_MouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
rec.ReleaseMouseCapture();
isDragging = false;
}
This code could be enhanced, but I think you got the idea ;)

Answer 2

Based on #Bruno's, this is my solution:
double maxX;
double maxY;
private void OnRectMouseDown(object sender, MouseButtonEventArgs e)
{
maxX = canv.ActualWidth - rect.Width;
maxY = canv.ActualHeight - rect.Height;
rect.CaptureMouse();
rect.MouseMove += OnRectMouseMove;
rect.MouseUp += OnRectMouseUp;
}
private void OnRectMouseMove(object sender, MouseEventArgs e)
{
var pos = e.GetPosition(canv);
var newX = pos.X - (rect.Width / 2);
var newY = pos.Y - (rect.Height / 2);
if (newX < 0) newX = 0;
if (newX > maxX) newX = maxX;
if (newY < 0) newY = 0;
if (newY > maxY) newY = maxY;
rect.SetValue(Canvas.LeftProperty, newX);
rect.SetValue(Canvas.TopProperty, newY);
xVal.Content = (newX / maxX).ToString("F3");
yVal.Content = (newY / maxY).ToString("F3");
}
private void OnRectMouseUp(object sender, MouseButtonEventArgs e)
{
rect.ReleaseMouseCapture();
rect.MouseMove -= OnRectMouseMove;
rect.MouseUp -= OnRectMouseUp;
}

Answer 3

try this:
private void Form1_MouseClick(object sender, MouseEventArgs e)
{
(name).Location = new Point(e.X,e.Y);
}
so that will make it so if you click the object will appear there