How can I get scrollbars on Picturebox

问题:

I have PictureBox picture.

I use:

picture.Size = bmp.Size;
picture.Image = bmp;

Let's say there are two integers maxWidth and maxHeigth.
I want to add vertical/horizontal scrollbar to picture when its size exceeds maxWidth and/or maxHeight. How can I do that?

回答1:

You can easily do it with a Panel Control

Insert a panel to your form, say panel1 and set

panel1.AutoScroll = true;

insert a PictureBox to the Panel, say picture and set

picture.SizeMode = PictureBoxSizeMode.AutoSize;

and set the Image

picture.Image = bmp;

hope this helps

回答2:

Here's a project where a guy built an ImagePanel user control that you can drop onto a form; it gives you scrollbars and zoom capability.

http://www.codeproject.com/KB/graphics/YLScsImagePanel.aspx

回答3:

I got it to work by also putting a picturebox inside a panel control, I set the Panel's AutoScroll property to true, but I also set the Panel's Autosize property to True, and the Panel's Dock property to Fill (that way when the user resizes the form - so will the Panel). For the Picturebox, I set it's Dock property to None, and the SizeMode to Autosize (so it resizes also when the Panel and form Resizes. It worked like a charm, the Picturebox has Scrollbars and when the user resizes the form - everything is still placed correctly!

回答4:

Another suggestion is to put the picturebox inside a FlowlayoutPanel .

Set the Auto scroll of the FlowlayoutPanel to true and set the picture size mode to normal

Using a FlowlayoutPanel makes sure the image is always at 0,0 in the panel