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magnify
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1992-02-09
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3KB
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(* Title: magnify.h
* Purpose: Display and entry of magnification factors
*
*)
#ifndef __magnify_h
#define __magnify_h
(* ---------------------------- magnify_select ----------------------------
* Description: Display dialogue box to set magnification factors.
*
* Parameters: int *mul, *div -- multiplication/division factors
* int maxmul, maxdiv -- maximum mult/div factors
* magnify_handler -- caller-supplied function
* void *phandle -- handle passed to user function
* Returns: void.
* Other Info: Displays a template called "magnifier" (which must be one of
* your loaded templates). Mul and div are the initial
* values on the left and right of the ":" in the ratio shown
* in the dialogue box. They are modified according to user
* mouse clicks on the "arrow" icons. Proc (if non-null) is
* called each time the magnification factor changes.
* The template should have the following attributes:
* window flags -- moveable, auto-redraw
* Advisable to have title icon with text
* "magnifier" or similar
* icon #0 -- the multiplication factor icon
* -- should have indirected text flag set with
* -- text something like "999" and max length 4
* -- also advisable to have validation string
* -- "a0-9" (allowing numeric input)
* -- button type should be "writeable"
* icon #1 -- the division factor icon
* -- same as icon #0
* icon #2 -- the increase multiplication factor icon
* -- should have text flag set and contain the
* -- "up-arrow" character (like for scroll bars)
* -- button type should be "auto-repeat"
* icon #3 -- the decrease multiplication factor icon
* -- same as icon #2 except use "down-arrow" char
* icon #4 -- the increase division factor icon
* -- same as icon #2
* icon #5 -- the decrease division factor icon
* same as icon #3
* icon #6 -- (optional but advisable) a text icon placed
* between icons #0 and #1 as a separator
* eg. ":"
*
* These icons can be arranged in the window however you wish
* but a reasonable layout is like the "magnifier" dialogue
* box in !Draw or !Paint.
*
*)
type magnify_handler = ^procedure handler(p : pointer);
procedure magnify_select(var mul, _div : integer;
var maxmul, maxdiv : integer;
handler : magnify_handler;
phandle : pointer); extern;
#endif
(* end magnify.h *)