Modifying an existing indicator to filter alerts

Requirements Specification

I want to modify the alerts on an MQL4 TMA bands indicator. At present, the indicator gives two alerts: 

LowerBandTouchAlert : when price tags the lower band
UpperBandTouchAlert : when price tags the upper band

I want to add the option for the alerts to be filtered by the trend. The trend is defined by the indicator's 'Trend threshold' setting which colors the center line (green for an uptrend, red for a downtrend, and white when the trend is flat).

I assume the additional coding required would be something like the following:

Add toggle: Filter alerts TRUE/FALSE
If NO, alerts remains unchanged

If YES, insert the two toggles below:
Alerts when trending: TRUE/FALSE
Alerts when flat: TRUE/FALSE 

To confirm, when all three toggles are TRUE, alerts should be given as illustrated in the attached graphic:

1) Lower band touch alert only in UPTREND (blue circles)
2) Upper band touch alert only in DOWNTREND (red circles)
3) Both bands touch alert if trend FLAT (white circles)