hi jules, since i’m using the MidiKeyboardComponent a lot, and i need to specialize it to let it be in sync with a midi grid:
mainly it paints white/black keys with different widths (regardless of setKeyWidth calls), so doing a conversion function from mouse position to note/beat is quite cpu consuming cause i have to keep track of the painted midi keyboard widths offsets.
so i need it to paint and behave a little different, but all members are private
could they be promoted to protected ?
Which bits do you need? Or could there be a more generic way of adding what you’re trying to do? Maybe a virtual function to calculate the positions?
well i’ve got something like this:
you notice the midi grid ?i have to subtract these offset to the row height (10px)in order to keep it in sync with the midi keys width (15px):
const int noteAdjustOffsetAtFiftheenPixelsKeyWidth [12] = {
/*C*/0, /*C#*/1,
/*D*/1, /*D#*/1,
/*E*/1, /*F*/1,
/*F#*/2, /*G*/1,
/*G#*/2, /*A*/1,
/*A#*/2, /*B*/1
};
obviously it looks in sync only with the passed sizes.
would be cool if there was a virtual function that let you organize keys the width you want.
hope you understand what i mean… (i basically need to give the midi keys a special width, so i can draw the grid rows at a fixed height)
Would it be enough to make getKeyPos a virtual method so you could do your own version?
yes thanx that would do the job 
obviously you should pass also the key width selected (so i can guess how many pixels an octave will eat up).
ok, try the tip now…
cd Projects/juce
svn up
cd build/linux
make && make CONFIG=Release
…the power of repository based source code…
yay!
well, rangeStart - rangeEnd - xOffset are private
i think that
jassert (midiNoteNumber >= rangeStart && midiNoteNumber <= rangeEnd);
midiNoteNumber -= rangeStart;
should be done by the component before calling the getKeyPosition function (so don’t rely on checks made by the subclassed component).
also, doing -xOffset should be avoided from that function (i shouldn’t know the x offset, nor touch it directly), and rather done outside the call.
You’re quite right, there were a bunch of things wrong with that. Try it now.
ok the changes to getKeyPosition are now working good.
other thing: if i want to subclass
then octaveNumForMiddleC is private, and there is not getter method…
ok, I’ve added an accessor for the octave number
mighty jules … thanks and praises
