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GoFiler Legato Script Reference
Legato v 1.4j Application v 5.22b
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Chapter Eighteen — DataView Integration (continued)
Overview
The on_form_delete_all event is called when the FORM_DELETE_ALL menu function is invoked..
Syntax/Parameters
Syntax
int on_form_delete_all ( ) { ... }
Parameters
(none)
Return Value
An int returned as a formatted error code. The error is passed back to the caller.
Remarks
The default action for Forms View is to ignore the request (returns ERROR_FUNCTION_NOT_SUPPORTED).
To enable the ribbon or menu function, the hook on_menu_init() must return the bit FV_FORM_DELETE_ALL.
Example
An example for as data sheet employing template containing a table with a fixed read-only heading where the writable portion of table extends to the end of the sheet and first column is a padding area. In this example hook, a number of global items are already set: hView is the view’s handle; r_start is the start of table portion of the sheet; t_width is the width of the table.
/****************************************/
int on_form_delete_all() { /* Delete All Hook */
/****************************************/
handle hDV; /* Data View (Forms) Handle */
int rx, cx, /* Row and Column */
tab_last; /* Last Item (Count) */
int rc; /* Return Code */
/* */
/* ** Delete Entry */
/* * Initialize */
hDV = DataViewGetObject(hView); /* Get object for data view */
if (IsError(hDV)) { /* Something bad */
MessageBox('S', "Internal Error #1"); /* Display error */
return ERROR_CONDITION; /* Exit w/error */
} /* end error */
/* * Get Position */
rx = DataViewGetCaretRow(hDV); /* Get the current row position */
if (rx < r_start) { /* Should not happen */
MessageBox('S', "Internal Error #2"); /* Display error */
return ERROR_CONDITION; /* Exit w/error */
} /* Context error */
tab_last = DataViewGetRowCount(hView); /* Get the row count */
tab_last -= r_start; /* Adjust for top */
/* * Always Clear Top */
cx = 1; /* Set up column */
while (cx < t_width) { /* Loop for all columns */
DataViewCellSetText(hDV, rx, cx, ""); /* Clear the content */
cx++; /* Move to next */
} /* end clear loop */
/* * Delete Row */
if (tab_last > 1) { /* Has more than one row */
if (rx == r_start) { rx++; } /* On first line */
tab_last--; /* Remove the first line */
rx = r_start + 1; /* Second row */
DataViewDeleteRow(hDV, rx, tab_last); /* Delete rows */
} /* end has context */
return ERROR_NONE; /* Done */
} /* end function setup */
Related Events
on_menu_init — Called anytime the ribbon or a menu must be prepared for display or updated.
Page revised 2024-04-22
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