How to move a pictureBox inside a Panel by Mouse. Visual Studio 2015 C# Winsows Forms Application.
I've made a primitive slider to control the volume of my WindowsMediaPlayer. A panel as the background and a pictureBox inside as the slider-knopf. And it works well. But purely visually it does not work that good.
I'v searched all around, but can't I find an answer to this little funny problem.
Here is my code:
int posY;
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
posY = e.Y; ;
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
PictureBox box = sender as PictureBox;
if (e.Button == MouseButtons.Left)
{
box.Top += e.Y - posY;
}
if (box.Top < 0)
{
box.Top = 0;
}
if (box.Top > 100)
{
box.Top = 100;
}
int n = box.Top;
n = n * - 1 + 100;
label1.Text = n.ToString();
}
When I move the pictureBox out of the edge of the little panel, the pictureBox somehow 'shrinks' in the panel. But when I release the mouse, the pictureBox restore its size.
Why is that.? And how can I avoid it.?
Thanks.
I found a solution. It's not optimal, but it can be used. I changed the code to:
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
dragging = true;
startPoint = e.Location;
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (dragging)
{
Debug.WriteLine("mousemove X: " + e.X + " Y: " + e.Y);
pictureBox1.Location = new Point(0, pictureBox1.Top + e.Location.Y - startPoint.Y);
if (pictureBox1.Location.Y < 0)
{
pictureBox1.Location = new Point(0, 0);
dragging = false;
}
if (pictureBox1.Location.Y > 100)
{
pictureBox1.Location = new Point(0, 100);
dragging = false;
}
this.Refresh();
}
int n = pictureBox1.Location.Y;
n = n * -1 + 100;
label1.Text = n.ToString();
mediaPlayer1.settings.volume = n;
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
dragging = false;
}
I still need to put an 'if' to correct, when the pictureBox1 is pulled out of the panel. And to avoid flicker, I have had to put a 'dragging = false'. However, it results in the pictureBox1 is getting frozen to the edge, so I have to release the mouse, and re-click to continue.
But well - it's to live with.
Thanks.
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