[MacPerl] Using Apple Events

[ilir topalli <ilir@gis.net>]

I am a new Perl user and this is my first post to the MacPerl list.
Please bear with me.

I decided that I wanted to learn how to use Quickdraw (and by
consequence windows.pm and events.pm) and that the best way to do this
was to write some applications using QuickDraw. I realize now this might
have been a fools errand as I have little  experience with the mac
toolbox and Perl code for doing this doesn''t really make for easy
reading.

I wrote a short program to write box outlines as the user drags around
the window and then print a box with a pattern in it after he lets go of

the mouse - much as is done in virtually every quickdraw based painting
program.

I handled this with Mac::Events using
1) mousedown, mouseup, getting the cursor position and converting it to
local window coordinates;


2) checking to see if the mouse is still down (so as to draw the outline
rectangle);
3) checking for mouse up to draw the final box.

My code is primitive and is really meant just as a learning device for
myself.  It can only be stopped using command-period. I realize that
events drawn into a window might normally have to be handled in the
screen redrawing routine or some such thing in order to be permanent.

My Question Is:  Is there a way to use these Mac::Events features to
read mouse activity without deactivating all of the rest of the mouse
functions?
In this script although I can draw boxes I cannot drag the window or use
the close box, grow box, or zoom box.

I would rather not reprogram all of this functions into subroutines for
each and every mouse event.  Is there someway to carry out the mousing
functions I want without losing all of the other mouse event features?


Here is the Code:
_____________________________________________________

#!perl

use strict;
use Mac::LowMem;
use Mac::QuickDraw;
use Mac::Windows;
use Mac::Events;use Mac::Events;
use Mac::Events qw(@Event $CurrentEvent);

my ($love,$win,$clk,$horz,$vert,$hOrigin,$vOrigin,$h1,$v1,$shape,);

$Event[mouseDown] = \&mouseDown_Handler;
$Event[mouseUp] = \&mouseUp_Handler;

$love = new Pattern q{
     .XX.XX..
           XXXXXXX.
           XXXXXXX.
           .XXXXX..
           ..XXX...
           ...X....
           ........
           ........
       }; # everyones favorite pattern

$win = new MacWindow (
       new Rect (130, 143, 500, 500), #set window with these coordinates

       ' Demo',      #window title
       1,
       documentProc,     #window type
       1,
     );

 while ($win->window) {   #while window exists
     WaitNextEvent();
                 }

 END {
  $win->dispose() if (defined($win));  #dispose of windows upon ending
    }






sub mouseDown_Handler
{
   SetPort $win->window;  # I beleive this sets the graphics port to the
window
   $clk = LMGetMouseLocation(); #get the location of the mouse down
(global coordinates
  $clk = GlobalToLocal($clk);   #translate it into loca window
coordinates
 ($horz, $vert) = ($clk->h, $clk->v); #convert horizontal and vertical
coordinates to these
 $hOrigin = $horz;  #this will be the origin of the first click
 $vOrigin =$vert;

 $shape = Rect->new($hOrigin, $vOrigin, $horz, $vert);
 RGBForeColor(new_color(0, 50000, 50000));# aqua

 while ( StillDown() )
  {
 $h1=$horz;$v1=$vert;   #set to old mouse coordinates
   SetPort $win->window;
 $clk = LMGetMouseLocation(); #get new mouse coordinates
 $clk = GlobalToLocal($clk);  #convert to local window coordinates
 ($horz, $vert) = ($clk->h, $clk->v); #set new mouse coordinates

 if (($h1 !=$horz) && ($v1 !=$vert))  #Are the new coordinates diff from
the old ones?
  {
   RGBForeColor(new_color(65535, 65535, 65535));# white-couldn't find a
better way to erase!
  FrameRect( Rect->new($hOrigin, $vOrigin, $h1, $v1));  #erase old
Rectanlge outline
  FrameRect( $shape);

  RGBForeColor(new_color(0, 50000, 50000));# aqua Draw new rectangle
outline
  $shape = Rect->new($hOrigin, $vOrigin, $horz, $vert); #use new mouse
coordinates
   FrameRect($shape);
  }
else  {        #if they are the same mouse coordinates don't bother
erasing
  RGBForeColor(new_color(0, 50000, 50000));# aqua
       FrameRect($shape);}
  }


}


sub new_color
# a color choosing nicety I got off of this board
{
 bless(\pack('SSS', @_[0..2]), 'RGBColor');
}



sub mouseUp_Handler
{
# If the mouse is released fill the rectangle with hearts

 RGBForeColor(new_color(0, 50000, 50000));# aqua
 FrameRect(Rect->new($hOrigin, $vOrigin, $horz, $vert));
 FillRect(Rect->new($hOrigin, $vOrigin, $horz, $vert), $love);


}




__END__



_____________________________________________________
Thanks, Ilir


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