On vertical and horizontal scroll

[vandana7]

I m opening the image in OnFileOpen() but when i scroll vertically or horizontally it disappears. When done from OnDraw it is doing fine.Please Help.

[SandipG]

when you will scroll the window it will be repainted always. if you want the the image to be displayed all time you have to handle in OrDraw/OnPaint only.

[Hamid Taebi]

I dont understand,can you more explain?

[vandana7]

i m opening a image in OnFileOpen function it opens finebut when i start scrolling it disappears. When the it is done in OnDraw function it is displaying image while scrolling. Please Help.

[Alan Balkany]

First you need handler methods for scrolling, which update the scrolled coordinates (usually the upper-left corner's coordinates). In these methods add: Invalidate (); The Invalidate () method will cause OnDraw () to be invoked. Your OnDraw () method should draw the image, starting at the current scrolled coordinates. An alternative is to use the CScrollView class, which handles scrolling for you. If you do this, the OnDraw () method should just draw the whole image.