- 4.49.1.13. -
Table of Contents
4. Standard Units
4.49. Mouse - Mouse Handling
4.49.1. Mouse Unit Procedures and Functions
4.49.1.13. SetMouseHandler procedure
4.49.1.13. SetMouseHandler procedure
Targets: MS-DOS, Win32 console
Mouse Unit
Installs a Pascal interrupt-driven user's mouse handler
(Hnd).
Declaration:
procedure SetMouseHandler (Mask: DWord;
Procedure Hnd (Mask,
Buttons,
X, Y,
MovX, MovY: System.Word));
Remarks:
The Mask parameter defines the classes of the events
that call the handler; its format corresponds to the function
0Ch (INT 33h). When Hnd is called the Mask parameter
contains the mask with the event type that occurred;
Buttons contain the mask of the currently pressed buttons;
X and Y contain the cursor's absolute position,
and MovX and MovY contain the relative (signed) change
of the last cursor position [negative numbers mean left or down;
positive mean right or up]. These values are given in mouse position units;
to convert to symbols, they need to be divided by 8.
Using SetMouseHandler you can install several handlers with
different masks without having to clear previous handlers.
Event Mask (events which you want sent to your handler)
bit 0 = mouse movement (Mask = $01)
bit 1 = left button pressed (Mask = $02)
bit 2 = left button released (Mask = $04)
bit 3 = right button pressed (Mask = $08)
bit 4 = right button released (Mask = $10)
bit 5 = center button pressed (Mask = $20)
bit 6 = center button released (Mask = $40)
all events: Mask = 007fH
disable handler: Mask = 0000H
See also:
ClearMouseHandler
Example:
program Test;
{$ifndef __DOS__}
{$ifndef __WIN32__}
This program can be compiled for MS-DOS and Win32 console targets only
{$endif}
{$endif}
uses
CRT, Mouse;
var
isExit: Boolean := FALSE;
X, Y: DWord;
star: Word := $0F2A;
space: Word := $0F00;
procedure MyHnd(Mask, Buttons, X, Y, MovX, MovY: System.Word);
begin
GotoXY(1, 2);
Writeln('XPos = ', MickyToText(X),', YPos = ', MickyToText(Y), ' ');
end;
begin
ClrScr;
Writeln('Press Esc to exit');
HideCursor;
InitMouse;
SetMouseHandler($FFFF, MyHnd);
repeat
X := MickyToText(GetMouseX) + 1;
Y := MickyToText(GetMouseY) + 1;
if (LeftButtonPressed) and (Y > 2) and
(Y < 25) then WriteAttr (X, Y, Star, 1);
if (RightButtonPressed) and (Y > 2) and
(Y < 25) then WriteAttr (X, Y, Space, 1);
if Keypressed then
isExit := ReadKey = #27;
until isExit;
ShowCursor;
DoneMouse;
end.
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