Help for switch-case-break code

Hi,

When the user interactions with the list box, Igor will send a message, eventcode, to the function saying what is happening.  Within your script you can have different things happen depending on the type of action and the switch flow control is the code snippet inserted as a template.  For example eventcode=1 is mouse down, 3 is double click, and so on.  So for example you want something to happen when editing is finished you would insert code in the case 7.

To cause a beep on double clicking and run function called fred with the row number as an input variable when done editing :

Andy

From the manual

WMListboxAction
This structure is passed to action procedures for listbox controls created using the ListBox operation.
 

The constants used to specify the size of structure char arrays are internal to Igor Pro and may change.
WMListboxAction eventCode Field
Action functions should respond only to documented eventCode values. Other event codes may be added in the future.
The event code passed to the listbox action procedure has the following meaning:
Event Code    Event
-3    Control received keyboard focus (Igor8 or later)
-2    Control lost keyboard focus (Igor8 or later)
-1    Control being killed
1    Mouse down
2    Mouse up
3    Double click
4    Cell selection (mouse or arrow keys)
5    Cell selection plus Shift key
6    Begin edit
7    End edit
8    Vertical scroll
    See Scroll Event Warnings under ListBox
9    Horizontal scroll by user or by the hScroll=h  keyword
10    Top row set by row=r  or first column set by col=c  keywords
11    Column divider resized
12    Keystroke, character code is place in row field
    See Note on Keystroke Event under ListBox
13    Checkbox was clicked. This event is sent after selWave is updated.
WMListboxAction row and col Fields
The row field is the row number of selection in interior or -1 if in title area.
The col field is the column number of the selection.
The meanings of row and col are different for eventCodes 8 through 11:
Code    row    col
8    Top visible row    Horizontal shift in pixels.
9    Top visible row    Horizontal shift (user scroll).
9    -1    Horizontal shift (hScroll keyword).
10    Top visible row    -1 (row keyword).
10    -1    First visible col (col keyword).
11    Column shift    Column resized by user.
If eventCode is 11, row is the horizontal shift in pixels of the column col that was resized, not the total horizontal shift of the list as reported in V_horizScroll by ControlInfo. If row is negative, the divider was moved to the left. col=0 corresponds to adjusting the divider on the right side of the first column. Use ControlInfo to get a list of all column widths.

A switch does flow control a bit like an if-block.

this

is the same as this