[英]C# drag and drop picturebox
我有7個圖片框,我想拖放其中的每一個。 我已經進行了拖放,但是它帶有原始圖片框,而我拖動它並不會把它留在原處。 這是我的代碼:
this.pbAND.MouseDown += pictureBox_MouseDown;
pbAND.MouseMove += pictureBox_MouseMove;
pbAND.MouseUp += pictureBox_MouseUp;
this.pbOR.MouseDown += pictureBox_MouseDown;
pbOR.MouseMove += pictureBox_MouseMove;
pbOR.MouseUp += pictureBox_MouseUp;
private void pictureBox_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
p = (PictureBox)sender;
downPoint = e.Location;
var dragImage = (Bitmap)p.Image;
IntPtr icon = dragImage.GetHicon();
Cursor.Current = new Cursor(icon);
p.Parent = this;
p.BringToFront();
DestroyIcon(icon);
}
}
private void pictureBox_MouseMove(object sender, MouseEventArgs e)
{
p = (PictureBox)sender;
if (e.Button == MouseButtons.Left)
{
p.Left += e.X - downPoint.X;
p.Top += e.Y - downPoint.Y;
}
}
private void pictureBox_MouseUp(object sender, MouseEventArgs e)
{
p = (PictureBox)sender;
Control c = GetChildAtPoint(new Point(p.Left - 1, p.Top));
if (c == null) c = this;
Point newLoc = c.PointToClient(p.Parent.PointToScreen(p.Location));
p.Parent = c;
p.Location = newLoc;
}
但它帶有原始圖片框(我拖動它)不會將其留在原處。
所以要在放下PictureBox時進行復制嗎?
在MouseDown()處理程序中,將原始位置存儲在Tag()屬性中:
private void pictureBox_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
p = (PictureBox)sender;
p.Tag = p.Location; // <-- store the Location in the Tag() property
// ... rest of the existing code ...
}
}
在MouseUp()處理程序中,在當前位置放置一個New PictureBox並重置原始圖片:
private void pictureBox_MouseUp(object sender, MouseEventArgs e)
{
p = (PictureBox)sender;
// create a new PictureBox that looks like the original:
PictureBox PB = new PictureBox();
PB.Size = p.Size;
PB.Image = p.Image;
PB.SizeMode = p.SizeMode;
PB.BorderStyle = p.BorderStyle;
// etc...make it look the same
// ...and place it:
Control c = GetChildAtPoint(new Point(p.Left - 1, p.Top));
if (c == null) c = this;
Point newLoc = c.PointToClient(p.Parent.PointToScreen(p.Location));
PB.Parent = c;
PB.Location = newLoc;
p.Parent.Controls.Add(PB); // <-- add new PB to the form!
// put the original back where it started:
p.Location = (Point)p.Tag;
}
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