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Basic: How to go about implementing such a view?

Hi!

I am trying to figure out how to implement a 'Piano Roll' view in Cocoa. Attached is a screenshot of what I'm trying to accomplish. Disregard the keyboard on the left of the window and let's just focus on the area with the colorful rectangles, symbolizing notes.

1. When drawing the light and dark grey rows which make up a background, should I just use a loop with Quartz 2D/Cocoa Drawing calls?
2. When drawing the vertical lines, should I just use a loop with Quartz 2D/Cocoa Drawing calls?
3. Should I put the notes (colorful rectangles) each in a separate view (or Core Animation layer), or is it effective to just draw them directly in the main view (same view in which the rows are drawn)? I am eventually going to want to resize them and change their position by dragging them around.
4. How would I go about changing the view's width as more notes (rectangles) are added to the view? When enclosed in a NSScrollView, would manipulating the width of the view also hide/show the horizontal scrollbar appropriately?

Thanks!

~Matt


JPEG image


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