Re: Displaying Internal State

[Marcus G. Daniels]

>>>>> "DA" == David Aliaga <address@hidden> writes:

DA> Then Lets suppose that I am not interested in this displaying so I
DA> closed the canvas (click on X)

DA> then again I am interested in the internal state so again I
DA> clicked on "createCanvas"

You can use `destroy notification' to clear the textItem array when the canvas
is destroyed.  For example,

*** probeDemo2.m        Mon Oct 23 16:18:18 2000
--- probeDemo2b.m       Mon Oct 23 16:16:59 2000
***************
*** 74,79 ****
--- 74,89 ----
    return self;
  }
  
+ - (void)canvasDeath
+ {
+   unsigned ri, ci;
+ 
+   for (ri = 0; ri < ROWS; ri++)
+     for (ci = 0; ci < COLS; ci++)
+       textItems[ri][ci] = nil;
+   [canvas drop];
+ }
+ 
  - (void)createCanvas
  {
    unsigned ri, ci;
***************
*** 85,90 ****
--- 95,102 ----
    [canvas setWidth: CANVAS_WIDTH Height: CANVAS_HEIGHT];
    [canvas setWindowTitle: "internalState"];
    [canvas pack];
+   [canvas enableDestroyNotification: self
+           notificationMethod: M(canvasDeath)];
  
    [self update];
  }

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