iPhone scrolling

[thundershadow14]

Hello all,

I'm writing an iPhone media player in Visual Studio 2005 for windows mobile devices. Anyone here, think they can make a nice scrolling iPhone playlist? Or at least, point me in the right direction for what I'd need to do?? Would REALLY appreciate it.

[kebo]

First off let me say that I don't own an iPhone (/me is too cheap to own a $500 phone ), but from what I have seen, the iPhone uses an acceleration based scrolling mechanism. What I mean is that the faster you scroll, the farther you scroll. Because of that using a standard scroll bar is out of the question. One way to approach it would be to use the MouseMove event on the object you are going to scroll (maybe a panel) then look at the distance the mouse has moved between calls to the routine and base the scroll on that. Also if I recall the scrolling on the iPhone doesn't immediately stop. It has a deceleration to it that makes it slow down, then stop. It sounds like a fun project and could make a really cool control object it you do it right.
GL
kevin

[Atheist]

How do you make a .Net application work on an iPhone?

[kebo]

you don't, but I think he's trying to duplicate the look and feel of the iPhone on a windows device

[thundershadow14]

First off let me say that I don't own an iPhone (/me is too cheap to own a $500 phone ), but from what I have seen, the iPhone uses an acceleration based scrolling mechanism. What I mean is that the faster you scroll, the farther you scroll. Because of that using a standard scroll bar is out of the question. One way to approach it would be to use the MouseMove event on the object you are going to scroll (maybe a panel) then look at the distance the mouse has moved between calls to the routine and base the scroll on that. Also if I recall the scrolling on the iPhone doesn't immediately stop. It has a deceleration to it that makes it slow down, then stop. It sounds like a fun project and could make a really cool control object it you do it right.
GL
kevin

Thanks for the advice, I've got code to trap both X and Y mouse positions already, but my problem is, let's say I use a panel, how do I get a list into it, where each line is selectable, and how do I control scroll parameters? For example, I coded a similar app in flash, (but windows mobile devices dont have enough horsepower to deal with flash apps like mine) but it had a parameter like this:

textbox.scroll += 5

How do I allow an object to scroll from code in VB .net. And furthermore, for my specific need, WHAT am I scrolling, lol.

Thanks so much again!

Chad.

[kebo]

How do I allow an object to scroll from code in VB .net. And furthermore, for my specific need, WHAT am I scrolling, lol.

I don't know what you would be scrolling.....maybe you could set up a listbox and change the selected item property using a timer whose interval gets dynamically set based to the information acquired in the mouse move event. What ever it is though, you need to define the objects first, then figure out out to scroll it.
kevin

[thundershadow14]

Hey kevin,
Thanks again for the advice, I'll let you know if I ever figure it out. Someone's been telling me something about "repainting" the list, or "redrawing" it or something, not sure what that means, but I'll look into it.

Thanks,
Chad.

[PENNYSTOCK]

From my time working with scrolling and GDI, I found that the only way to have something scroll smothly is to use GDI fuctions with double buffering.

Another optioin is to use a picture box and generate a graphic of you list. Then you can just move the graphic in your picture box for scrolling. I would acutal make my own control that was based on the picture box for adding click, drag.... support.

[thundershadow14]

From my time working with scrolling and GDI, I found that the only way to have something scroll smothly is to use GDI fuctions with double buffering.

Another optioin is to use a picture box and generate a graphic of you list. Then you can just move the graphic in your picture box for scrolling. I would acutal make my own control that was based on the picture box for adding click, drag.... support.

That sounds great, I like the picture box idea...but how would I be able to know what the person clicks on, if it's not a list box, with items for each line. The picture box would only be a static moving graphic...correct??

Chad

[PENNYSTOCK]

You would have to keep track of where your drew your text on your graphic, then when someone clicks on the image, you would determin from the click cordinance what was under the cursor and process that.

[thundershadow14]

You would have to keep track of where your drew your text on your graphic, then when someone clicks on the image, you would determin from the click cordinance what was under the cursor and process that.

Okay, I think im gonna go with a picturebox, and paint a list within the box, and detect the mouse movement, and move the painted object in the box as needed. How does that sound? Anything I need to know, before I go researching how to do this? I'm new to this whole "painting" aspect of GUI creation .

Chad.