By default, the CondnsideZoom property is empty. If empty, the CondInsideZoom property has no effect. If the  CondInsideZoom property is not empty and valid, it indicates the dates that can be magnified by double clicking the time unit in the base level, if the InsideZoomOnDblClick property is True, or by resizing the time unit, if the AllowResizeInsideZoom property is True. In other words, the CondInsideZoom property has effect ONLY if the AllowResizeInsideZoom or InsideZoomOnDblClick properties. So, it has no effect when adding the inside zoom units by code, using the Add method. 

The expression may be a combination of variables, constants, strings, dates and operators, and value. The value operator gives the date-time expression being checked.  A string is delimited by ", ` or ' characters, and inside they can have the starting character preceded by \ character, ie "\"This is a quote\"". A date is delimited by # character, ie #1/31/2001 10:00# means the January 31th, 2001, 10:00 AM.

For instance, if the CondInsideZoom property is "weekday(value) = 0" means that you allow zooming only for Sundays, or if it is "not(weekday(value) = 0 or weekday(value) = 6)" the control allow zooming only for working dates, as Monday to Friday. 

The value keyword in the CondInsideZoom property indicates the date-time expression being checked. 

The supported binary arithmetic operators are:

• * ( multiplicity operator ), priority 5
• / ( divide operator ), priority 5
• + ( addition operator ), priority 4 ( concatenates two strings, if one of the operands is of string type )
• - ( subtraction operator ), priority 4

The supported unary boolean operators are:

• not ( not operator ), priority 3 ( high priority )

The supported binary boolean operators are:

• or ( or operator ), priority 2
• and ( or operator ), priority 1

The supported binary boolean operators, all these with the same priority 0, are :

• < ( less operator )
• <= ( less or equal operator )
• = ( equal operator )
• != ( not equal operator )
• >= ( greater or equal operator )
• > ( greater operator )

Obviously, the priority of the operations inside the expression is determined by ( ) parenthesis and the priority for each operator. 

The supported conversion unary operators are:

• type (unary operator) retrieves the type of the object. For instance type(%0) = 8 specifies the cells that contains string values. 

  Here's few predefined types:

   

  • 0 - empty ( not initialized )
  • 1 - null
  • 2 - short
  • 3 - long
  • 4 - float
  • 5 - double
  • 6 - currency
  • 7 - date
  • 8 - string
  • 9 - object
  • 10 - error
  • 11 - boolean
  • 12 - variant
  • 13 - any
  • 14 - decimal
  • 16 - char
  • 17 - byte
  • 18 - unsigned short 
  • 19 - unsigned long
  • 20 - long on 64 bits 
  • 21 - unsigned long on 64 bites

   

• str (unary operator) converts the expression to a string
• dbl (unary operator) converts the expression to a number
• date (unary operator) converts the expression to a date

Other known operators for numbers are:

• int (unary operator) retrieves the integer part of the number
• round (unary operator) rounds the number ie 1.2 gets 1, since 1.8 gets 2
• floor (unary operator) returns the largest number with no fraction part that is not greater than the value of its argument
• abs (unary operator) retrieves the absolute part of the number ie -1 gets 1, 2 gets 2

Other known operators for strings are:

• len (unary operator) retrieves the number of characters in the string
• lower (unary operator) returns a string expression in lowercase letters
• upper (unary operator) returns a string expression in uppercase letters
• proper (unary operator) returns from a character expression a string capitalized as appropriate for proper names
• ltrim (unary operator) removes spaces on the left side of a string
• rtrim (unary operator) removes spaces on the right side of a string
• trim (unary operator) removes spaces on both sides of a string
• startwith (binary operator) specifies whether a string starts with specified string
• endwith (binary operator) specifies whether a string ends with specified string
• contains (binary operator) specifies whether a string contains another specified string
• left (binary operator) retrieves the left part of the string
• right (binary operator) retrieves the right part of the string
• a mid b (binary operator) retrieves the middle part of the string a starting from b ( 1 means first position, and so on )
• a count b (binary operator) retrieves the number of occurrences of the b in a
• a replace b with c (double binary operator) replaces in a the b with c, and gets the result.

Other known operators for dates are:

• time (unary operator) retrieves the time of the date
• shortdate (unary operator) formats a date as a date string using the short date format
• longdate (unary operator) formats a date as a date string using the long date format
• year (unary operator) retrieves the year of the date
• month (unary operator) retrieves the month of the date ( 1, 2,...,12 )
• day (unary operator) retrieves the day of the date ( 1, 2,...,31 )
• yearday (unary operator) retrieves the number of the day in the year, or the days since January 1st ( 0, 1,...,365 )
• weekday (unary operator) retrieves the number of days since Sunday ( 0 - Sunday, 1 - Monday,..., 6 - Saturday )
• hour (unary operator) retrieves the hour of the date ( 0, 1, ..., 23 )
• min (unary operator) retrieves the minute of the date ( 0, 1, ..., 59 )
• sec (unary operator) retrieves the second of the date ( 0, 1, ..., 59 )

The expression supports also immediate if ( similar with iif in visual basic, or ? : in C++ ) ie cond ? value_true : value_false, which means that once that cond is true the value_true is used, else the value_false is used. Also, it supports variables, up to 10 from 0 to 9. For instance, 0:="Abc" means that in the variable 0 is "Abc", and =:0 means retrieves the value of the variable 0. You can use variables to avoid computing several times the same thing.

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