[英]c# How can I move a picturebox by a vScrollbar?
MSDN ScrollBar.Scroll事件的示例實際上顯示了如何滾動PictureBox
。
來自MSDN的代碼:
private void HandleScroll(Object sender, ScrollEventArgs e)
{
//Create a graphics object and draw a portion of the image in the PictureBox.
Graphics g = pictureBox1.CreateGraphics();
int xWidth = pictureBox1.Width;
int yHeight = pictureBox1.Height;
int x;
int y;
if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
{
x = e.NewValue;
y = vScrollBar1.Value;
}
else //e.ScrollOrientation == ScrollOrientation.VerticalScroll
{
y = e.NewValue;
x = hScrollBar1.Value;
}
g.DrawImage(pictureBox1.Image,
new Rectangle(0, 0, xWidth, yHeight), //where to draw the image
new Rectangle(x, y, xWidth, yHeight), //the portion of the image to draw
GraphicsUnit.Pixel);
pictureBox1.Update();
}
其中HandleScroll
是ScrollBar
的Scroll
事件的事件處理程序。
scrollBar1.Scroll += HandleScroll;
這是假設您嘗試滾動PictureBox
。 如果您真的只想移動它,可以嘗試以下操作:
private void HandleScroll(Object sender, ScrollEventArgs e)
{
var diff = scrollBar1.Value - e.NewValue;
if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
{
pictureBox1.Location = new Point(diff, pictureBox1.Location.Y);
}
else //e.ScrollOrientation == ScrollOrientation.VerticalScroll
{
pictureBox1.Location = new Point(pictureBox1.Location.X, diff);
}
}
警告,此代碼尚未經過測試。
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