LDraw
LDraw Draw the contents of a single cell void LDraw(theCell, theList ); Cell theCell ; cell to redraw ListHandle theList ; handle leading to a ListRec LDraw draws the contents of a single cell. If the cell is currently outside the visible region, or if drawing is off, this call does nothing.
theCell is a Cell (a.k.a. Point); it identifies the cell to draw. theList is a handle leading to a variable-length ListRec structure. It is a value previously obtained via LNew.
Notes: List Manager functions that change the contents of a cell automatically
update the screen to reflect those changes. For instance, LSetCell (changing the contents of a cell) will display the changed data
automatically. Similarly, LSetSelect automatically highlights or normalizes the cell.
Note: Contrary to information in IM IV, if drawing is off (see You could use LDraw to customize the way some cells are displayed. For instance, the following code draws a particular cell in boldface:
LDraw( theCell, theList ); Note that the above style change will NOT be remembered the next time the
cell is redrawn. For instance, if theCell gets scrolled out of the window and
back in, it will be redrawn in the current text style of the list's window.
If you change the contents of a cell without informing the List Manager, you
can use LDraw to force that change to be displayed. For instance, it is much more efficient to "zap" a character, say a check mark () or a bullet
(•), over a space character than it is to use LSetCell to change the entire contents of a cell:
short offset, len;
char *cp;
LFind( &offset, &len, theCell, theList ); cp = (char *)((long)**(* theList)->cells ) + offset;
*cp = checkMark; /* zap the check mark in place */
LDraw( theCell, theList ); /* force cell to be redrawn */