A lot of midi controllers have a "shift" key, which effectively doubles the number of buttons by allowing the user to hold the shift button while pressing another to activate secondary behavior.
Because the controller xml spec doesn't support buttons with dual-functions, this means a lot of logic is in javascript files. The actual logic is pretty simple, but it means that any button that could have two functions must be defined in the javascript file. While it's nice to have javascript to do advanced configuration, I think that shift functions are common enough that they should be directly supported. I think it would be fairly straightforward to add support for shift buttons inside the xml spec itself. First, the xml file would have a basic button declaration for shift. The shift buttons would just be simple pushbutton control objects: <control> <status>0x80</status> <midino>0x04</midino> <group>[Master]</group> <key>shift_1</key> <options> <button/> </options> </control> We could have support for up to 4 shift buttons, although most controllers only have 1. Then, designating one button to do two things would be done by creating two items for the same midi control and specifying a term in the <options> tag of one of them. <control> <status>0x80</status> <midino>0x14</midino> <group>[Channel1]</group> <key>hotcue_1_activate</key> <options> <button/> </options> </control> <control> <status>0x80</status> <midino>0x14</midino> <group>[Channel1]</group> <key>hotcue_1_clear</key> <options> <button/> <shift_1/> </options> </control> As far as implementing this in Mixxx, here's the todo: * the midi code would need to support multiple mappings for one key (insertMulti). * If a midi button is pushed the midi code will get multiple notifications, but only one will match the current shifted state. The midi code would just have to know about the shift_X control objects and check their status when receiving the event. * the learning wizard would need to be tweaked to understand and create shifted functions. I think this would fit in to Mixxx pretty easily, though it's not worth delaying 1.11 for. Existing controller configurations wouldn't be broken, and new configurations could do clever things like having shifted script activation. And, of course, I wouldn't have to write any javascript for the controller I'm working on right now :) Owen ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Get Mixxx, the #1 Free MP3 DJ Mixing software Today http://mixxx.org Mixxx-devel mailing list Mixxx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mixxx-devel
