On 19/12/2009, at 8:58 PM, XiaoGang Li wrote: > Hello Lists, > I have a application used to review the graphics. In the user > interface, there is a slider bar, which used to control the zoom value, the > zoom value range from 20% to 2000%. You know, it is better to locate the > slider knob in the middle of the slider when the zoom value is 100%. That's > to say, when the knob is dragged between the beginning to the middle of the > slider, the zoom value range from 20% to 100%, when the knob is dragged > between the middle of the slider to the end, the zoom value range from 100% > to 2000%. > I don't know how to customize this kind of slider bar, could you > please give me a hint? do i need to implement a slider controller?
This came up a few days ago in connection with a pitch-shift slider for a musical app. Just do a suitable range/scale mapping from the linear slider to the geometric values you want. You'd do that in the controller that is handling the slider - it doesn't need a separate slider controller. --Graham _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
