Re: getProp puzzle

2016-09-12 Thread dfepstein


Thanks to Mike Bonner for his helpful suggestions. Stack A and Stack B are both 
mainStacks. Further tests seem to confirm this rule: 

  

A setProp or getProp handler in the script of stack A cannot be invoked for a 
target in Stack B UNLESS we have "started using" stack A (even if Stack A is 
the frontmost stack). 

  

On first thought this seems a little strange to me. For function or command 
handlers, we only need to "start using" a stack if we want to call its script's 
handlers when that stack is not frontmost; and when we "start using" it those 
handlers are just as accessible as the handlers in the frontmost stack's 
script. But for getProp and setProp handlers, the script of the frontmost stack 
and the script of a stack we have started using do not have the same efficacy. 

  

Perhaps the logic is clearer if Stack B has its own getProp myProp handler 
whose script differs from Stack A's getProp myProp handler.  In that case it 
probably makes sense for the virtual property of an object in Stack B to follow 
the getProp rules of its own stack, when called from Stack A (even though a 
function handler in Stack A that queries properties of Stack B, invoked while 
Stack A is frontmost, would take priority over a function handler in Stack B). 

  

David Epstein 
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Save Stack very slow in Windows 7

2015-11-05 Thread dfepstein
I have for years successfully run a set of stacks using LiveCode 5.5.3 in 
Windows 7.  Recently certain operations have become painfully slow (Windows 
says "not responding" for 2 minutes or so, but eventually does respond and the 
operation is completed). 
Setting some breakpoints to investigate, I discovered that the bottleneck 
commands are 2 simple "Save stack x" statements.  The stacks being saved are 
2.3 and 0.3 megabytes. 
The same stacks run without problem using LiveCode 5.5 on Mac OSX.  And until 
recently they ran well on Windows 7. 
Has anyone had this experience, or an idea for a remedy? 
Thanks very much. 
David Epstein 
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Field loses its identity as a target

2015-07-29 Thread dfepstein
I have encountered a bizarre problem that occurs in a somewhat complicated 
context.  I wonder if anyone has experienced anything similar. 
In short:  when I click a locked field on one occasion “the long id of the 
target” returns the expected result; but when I click on it subsequently “the 
long id of the target” returns the long id of the card instead. 

Details: 
To allow the user to edit certain properties of a card, I copy a “dropPanel” 
group to that card, allowing the user the adjust various controls on that group 
whose settings I use to adjust the appropriate properties of the card.  I want 
the “dropPanel” to disappear if the user clicks outside of it, so I insert a 
frontScript that, on mousedown, checks whether the targeted object is part of 
the dropPanel group. 

This has worked well for a long time, but I now encounter this problem.  
Several of the controls in one of my dropPanels are locked fields (call one of 
these “A”).  The first time one is clicked on, it operates as expected.  But on 
subsequent clicks my dropPanel gets deleted.  When I debug my frontScript, I 
see that on the first occasion the long id of the target is recognized as 
“field id x of group id y of… etc.”—and my script confirms that this control is 
indeed part of the dropPanel group and so clicking it should not delete that 
group.  On subsequent clicks, however, that same target is interpreted as “card 
id x… etc.”, which of course is not a member of the group, and this causes my 
group to be deleted. 

Why does my field “A” lose its identity between these two clicks?  When working 
properly, the click on the locked field causes a different group to be created 
adjacent to it, allowing the user to select one or more things from a list 
field (“B”), and then click a Cancel or OK button.  (This subgroup does not 
have the auto-close feature).  The OK button of that subgroup sets a custom 
property of and sets the text of field “A”—neither of which seems like it 
should cause that main field no longer to be recognized as a target.  And the 
Cancel button does nothing at all to the main field.  OK and Cancel both delete 
the subgroup that includes them and Field “B”. 

Testing various combinations of events, I learned that the problem arises 
whenever the user selects something in the list field “B”—regardless of whether 
he clicks OK or Cancel—but there is no problem if he never makes a selection in 
that list field “B”—again, regardless of whether he clicks OK or Cancel.  (And 
if toggleHilites is true for field “B” the problem arises even if the user 
removes a selection he initially made). 

So it seems as if nothing my scripts do to Field “A” is associated with its 
losing its identity; it is rather the fact that one or more lines have been 
selected in a different field (the list field “B”).  Two more symptoms 
- clicking on a second locked field that operates in the same way also causes 
the problem; i.e., two clicks on one field or one each on two fields makes no 
difference. 
- Field A does not seem to lose its identity until the subgroup containing 
Field B is deleted.  If a wayward user repeatedly clicks on Field A and makes a 
selection in Field B without clicking OK or Cancel, the script as written will 
keep creating new subgroups with new Field B’s.  Only after the user has 
repeatedly clicked OK or Cancel to remove the duplicative series of subgroups 
will a click on Field A cause the problem. 

Thanks very much for any insights about this. 

David Epstein 

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Script-controlled export of animation from Livecode?

2015-07-29 Thread dfepstein
Is there a way of scripting the export of an animation constructed in Livecode 
to some standard video file format (avi, mp4, etc.)?Alternatively, is there a 
way of scripting the creation of a standalone Livecode file that contains the 
animation? 
  
David Epstein 
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Re: Insertion point problems

2015-06-25 Thread dfepstein


Thanks to Bernd for the simplest solution to my practical problem. If we go 
to Stack A the selectedChunk will mean the selectedChunk in stack A. But, 
as he notes, preservation of the prior selection depends on certain conditions 
(more on this below). 




One anomaly is that the selectedChunk seems to preserve its value when we are 
NOT in Stack A--but ONLY if it was (let's call it) a selectedRun and not just 
an insertion point; and ONLY if we are not in and have not navigated to some 
stack with an unlocked field. (It turns out that whether Stack B is a palette, 
and my set the default stack to StackA command, are both irrelevant). 




This anomaly may have no practical importance, given Bernd's approach (and the 
option others have explained to store our own record of the selectedChunk). But 
one other aspect of Bernd's approach is surprising. When we go to a stack 
(either by script or by clicking on the title bar), the restoration of its 
prior selection varies as follows: 

1. if it was a selectedRun, and we have not since been to a stack with an 
unlocked field, the selectedChunk remains that run. 

2. If it was a selectedRun and we have been to a stack with an unlocked field, 
the selectedChunk becomes an insertion point just after the selectedRun. (!) 

2. If it was an insertion point, that insertion point seems to be restored as 
the selectedChunk--EVEN IF we have visited a stack with an unlocked field. 




David Epstein 
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Re: Insertion point problems

2015-06-23 Thread dfepstein
Thanks to Craig Newman and Bob Sneidar.  Unless I have misunderstood them, 
which is possible, I think I have not clearly enough explained my problem.  
  
I want a menu button in a palette to paste the clipboard's contents to the 
topStack at the selectedChunk.  This works if the selectedChunk actually 
includes some hilited text (char 1 to 4...), but not if the selectedChunk is 
an insertion point (char 4 to 3...).  In the second case, but not in the 
first, the insertion point disappears and the selectedChunk property loses its 
value when a palette button is pressed, so the paste fails.  I recall that 
people resort to various ways of storing the selectedChunk, but am puzzled by 
this inconsistency between the first and second cases. 
  
My second question is whether LiveCode 7.01 only rarely shows the blinking 
insertion point that it should be showing whenever the current selection is 
before or after, or between consecutive, characters of an unlocked field.  This 
is my experience on Mac Yosemite, but it seems like such an obvious and 
important flaw that I would think others would have complained. 
  
Many thanks. 
  
David Epstein 


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Resolution of PDF in player object

2015-05-27 Thread dfepstein
I'm quite sure that on my PowerPC Mac a high resolution PDF in a LiveCode 
Player object was displayed not like a bitmap but just like it was in Preview 
or Acrobat.  I assume that LiveCode is tapping into QuickTime to render PDFs, 
so why is the PDF file's resolution degraded?  Is there any prospect that this 
will be corrected in future releases?  I have not tried revBrowser to display 
PDFs, so am not sure how its resolution works; but as I understand it 
revBrowser does not let us view pages other than the first of a multi-page PDF. 
Regards, 
David Epstein 
  
  
This probably doesn¹t help you, but in years gone by, my experience when 
using a player to view a PDF resulted in the content being displayed as a 
bitmap image, regardless of the type of content.  So enlarging beyond 100% 
would often appear pixelated.  I never encountered a player-viewed PDF 
displayed as anything BUT a bitmap.  But this was all QuickTime stuff, so 
things may have changed more recently. 

Regards, 

Scott Rossi 
Creative Director 
Tactile Media, UX/UI Design 




On 5/26/15, 4:09 PM, David Epstein  dfepstein at comcast.net  wrote: 

 In the past, when I displayed a PDF in a player object on my PowerPC Mac 
 Mini, I could scale it to, say, 1.5x the formattedWidth and 
 formattedHeight, and see it beautifully displayed at full resolution.  On 
 my newer MacBook Air and iMac this is not true; the PDF looks terrible 
 when scaled to anything other than 100%.  And if I print it, even at 
 100%, I get screen quality, i.e., very bad, resolution.  Has something 
 changed?  Can LiveCode not display or print PDFs at full resolution on an 
 Intel Mac? 
 
 David Epstein 
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Can a script preempt substack name conflicts?

2015-05-15 Thread dfepstein
Thanks for this prudent advice.  The case I am contemplating would involve a 
user creating new substacks to hold content.  While I can make sure each 
substack created by my program gets a unique name, if a file created on one 
machine is moved to another machine there is some chance of a conflict (reduced 
but not absolutely eliminated if I went to great lengths, like embedding in 
each substack's name the ticks at creation time). 
I think I can work around this IF the substack name conflict problem is only 
a problem for the LiveCode UI.  In other words if in my own scripts I am 
careful always to refer to a substack by its long name, am I safe even if two 
substacks have the same short name? 
  
David Epstein 
  
-- 



On 5/14/2015 8:16 PM, David Epstein wrote: 
 With stack A already open, I open stack B and get a alert like this: 
 
 A stack substackName in file fileName of stack A is already in  
 memory.  The Revolution UI does not distinguish stacks which have 
 identical names, so editing these stack files while both are in 
 memory could result in data loss.” 
 
 Is it possible by script to intercept the message that generates this 
 alert, and rename either the substack that is already in memory or 
 the substack of the stack I am trying to open, so as to avoid both 
 the alert and the risk of data loss?  My impression is that if I try 
 to learn the substack names of a file I will already be loading that 
 file into memory, and it will be too late to head off the alert. 

I don't think it's worth it to try and hack the IDE to get around the 
warning. You won't lose any data unless you make changes to one of the 
duplicate stacks and then try to save it. So what I usually do is note 
the name of the problem stack and quit LC. Then I restart, open the 
stack I want to change, and temporarily alter its name in the property 
inspector. I don't save it. 

Then open the second stack, do whatever work is necessary, and then 
close and remove it from memory. After that you can change the name of 
the original stack back to what it was again. 

When I know in advance I'm going to open duplicate-named stacks, I just 
change the first stack temporarily before opening the second one. It 
saves time. 

-- 
Jacqueline Landman Gay | jacque at hyperactivesw.com 
HyperActive Software   | http://www.hyperactivesw.com 


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Re: What is driving the MB of a stack?

2015-04-30 Thread dfepstein


Thanks to Scott Rossi and Richard Gaskin for their suggestions, which led me to 
the problem (large block of data stored as a custom property of a substack). 

  

While poking around, I noticed that many but not most controls and groups, when 
I get the customPropertySets of them, return the value cREVGeneral, 
although when I look for this in the property inspector I do not find it.  What 
causes this custom property set to be created for some but not all controls, 
and (assuming it is really there), is there any harm in removing it? 

  

David Epstein 
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What is driving the MB of a stack?

2015-04-29 Thread dfepstein
A stack I have gradually improved over several years now occupies 4 MB on disk, 
whereas for a long time it was more like 500 KB. 
Is there some way to diagnose what elements are causing this?  I'd like to 
generate a list of all of the stack's substacks, cards, fields, images, 
scripts, etc., and see the amount of stack space each is occupying. 
  
David Epstein 
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Re: Vector export?

2015-02-19 Thread dfepstein
For high resolution export of vectors:  open printing to pdf 
  
David Epstein 
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Re: Speed testing: Fastest search method

2014-08-31 Thread dfepstein
ad...@flexiblelearning.com compared 3 methods of stripping lines from a 
variable, and concluded: 
If memory is an issue, then Method 2 is best 
If memory is not an issue, then Method 3 is best 

3 questions: 

1. Is there a good way to determine ahead of time whether memory is an issue? 
When I start the handler I can find out how big tVar is, but how do I find out 
how much memory is available? 

2. Does this step in all 3 handlers -- 
put fld Data into tVar 
-- itself use up memory? If fld Data is occupying a gigabyte of RAM, does 
writing it to tVar use another gigabyte? 

3. Method #2 appears to me to violate the rule against modifying the variable 
to which you are applying repeat for each: 
#2: 
on mouseUp 
set the cursor to watch 
put the long seconds into tStart 
put fld data into tVar 
repeat for each line L in tVar 
add 1 to x 
if L= then 
put  into line x of tVar -- RIGHT HERE, WE'RE MODIFYING tVar! 
end if 
end repeat 
put tVar into fld output 
put the long seconds - tStart into fld timer2 
end mouseUp 

Have I misunderstood that rule? 

Many thanks. 

David Epstein 
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Achieving highest resolution output

2014-06-20 Thread dfepstein


I hope someone can help me understand printing resolution. 

If I use LiveCode to generate a PDF that will be printed at 300 dpi, how do I 
achieve the best output? For vectors, I assume that it makes no difference at 
what scale I compose the picture. (Is that true?) But suppose I want to print a 
bit map 1 inch wide. I would tell LiveCode to print into rect 0,72,0,72 (for 
example) to indicate that it should be 1 inch square. Will this work better if 
the original bit map is 300 pixels wide (to match the intended 300 dpi 
resolution)? Or if it's a multiple of 72, like 288, pixels wide? 

Further suppose that I want some 9 point text on my 1 inch square. For the case 
where I'm printing 288 pixels of width into a rectangle that is 72 wide, it 
seems clear I can compose with 36 point text. But if I'm printing 300 pixels 
into that 72 wide rectangle, will 36 be slightly too small? Should I use 37 
point text? 

Is composing at 300 pixels better for the bit map quality but 288 pixels better 
for getting the right the text size? 

Thanks for any guidance. 

David Epstein 
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numberFormat question

2014-06-16 Thread dfepstein


I am trying to set the numberFormat so that calculation is precise enough for 
the situation.  Since I don't know ahead of time how many decimal places will 
be used, I wrote a function that I hoped would adjust things as necessary. 
But when this function is called with parameters m = 1.09131 and n = .001 
and k = 1, it returns 1.09131 rather than 1.0913101. 
The last couple of lines were added for testing, and the debugger shows that 
the numberFormat is being set correctly but that the truncated value is put 
into hold. 
Can anybody see what is going wrong? 



Many thanks. 



David Epstein 



function preciseEnough m,n,k 
   -- return the value m + k*n 
   -- default numberFormat shows up to 6 decimal places 
   -- If m, n, or k  has more than that precision, this function sets the 
numberFormat with a margin of safety 
   -- before returning the answer 
   put length(m) - offset(.,m) into aPlaces 
   put length(n) - offset(.,n) into bPlaces 
   put length(k) - offset(.,k) into cPlaces 
   put the numberFormat into myString 
   if max(aPlaces,bPlaces,cPlaces) + 4  length(myString) then 
  get myString   
  set the numberFormat to it 
   end if 
   put the numberFormat into nf 
   put m + k*n into hold 
   return hold 
end preciseEnough 
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Re: Finding matched parentheses

2013-07-29 Thread dfepstein


On second thought : 


function offsetPair a,b,str -- str cannot be more than one line 
   -- returns first instance of char a  matching instance of char b in str, 
or 0 if no a or empty if no match 
   put offset(a,str) into ca 
   if ca = 0 then return 0 
   put numToChar(7) into char 1 to ca of str 
   set lineDelimiter to a 
   set itemDelimiter to b 
   repeat with i = 1 to the number of items in str 
  if i = the number of lines in item 1 to i of str then return ca  
ca+length(item 1 to i of str) 
   end repeat 
   return empty 
end offsetPair
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Re: Finding matched parentheses

2013-07-29 Thread dfepstein

Testing for speed, I found that my July 29 function--the one that uses 
lineDelimiter and itemDelimiter--is thwarted when two parens appear as 
consecutive characters, and gives the wrong answer in that case. Sorry about 
that. 


I may not have correctly implemented Peter Haworth's Regex string, but I get 
wrong answers from writing the function as below -- offsetPair6((a(a))) 
returns 2 5. 


function offsetPair6 str 
put \?[^()]+)|(?R))*)\) into tRegex 
get matchChunk(str,tRegex,tStart,tEnd) 
return tStart  tEnd 
end offsetPair6 


As far as I know the function I posted July 26 works correctly. 


David Epstein 
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Re: How Many Pages are in a PDF?

2013-05-29 Thread dfepstein


1 + (the duration of player myPlayerName)/ 75 



David Epstein 
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Re: Page 2 of a PDF

2013-04-05 Thread dfepstein


I think this will work on a Mac: 



on pdfToPage n -- show page n of the pdf in player 1 
  put round(n) into n -- n as passed by scrollBarDrag doesn't seem to 
  -- always be an integer 
  put (n-1)*75 into t 
  set the playSelection of player 1 to true 
  set the startTime of player 1 to t 
  set the endTime of player 1 to t+1 
  play step player 1 
end pdfToPage 

 Ray Horsley wrote 

      using a player object I can't control from a script which page of the PDF 
the player object is displaying. 



David Epstein 
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Opening a stack crashes RevMedia, and message box won't work

2012-12-11 Thread dfepstein


I have encountered two strange new symptoms using RevMedia 2.9 on a Windows 7 
machine.  I do not know if they are related. 



1.  I often write stacks on my Macintosh with Metacard 2.0, then run them 
successfully in Windows with RevMedia 2.9.  But for a new stack that works fine 
on my Mac, opening it in RevMedia causes Rev to quit, with no warning or 
advice.  I tried opening the same stack with a script lock messages; go card 1 
of stack x, but the result was the same.  

To try to troubleshoot, in a separate stack, I put the script of stack x into a 
field; edited the script to comment out the openStack and resumeStack 
handlers (the only ones that I see that would execute when the stack is 
opened); set the script of stack x to the revised version; and saved stack x.  
(Somewhat to my surprise, this all seemed to work, since I thought that such 
commands mean that Rev loads the stack into memory; so why no crash in this 
case?).  (Card 1 of stack x has no script). 
How can I diagnose the problem? 



2.  When I try to execute any command in the Message box, I get an error 
message, indicating that Rev has been tripped up on this line: 

  do global  the globalNames 

of the revExecuteMessage handler in the script of field Message Field of 
stack Message Box. 



Any suggestions? 



Many thanks. 



David Epstein 
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Pasting to a field from Internet Explorer 8

2012-08-29 Thread dfepstein


I have for a long time pasted text copied from other programs to a field by 
using a script like 
set the htmlText of [destination chunk] to clipboardData[html] 
After a recent upgrade to Windows 7 and Internet Explorer 8 this does not work 
for text copied from Internet Explorer; pasting yields a few commas or dashes 
instead.  If I first paste that text to Notepad, then select and copy it again, 
my script pastes correctly.  [this is in Rev Media 2.9] 
Does anyone have the same problem or a remedy? 

Many thanks. 

David Epstein 
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Counting days from a past date

2012-05-08 Thread dfepstein



I want to count the number of days between some past date and today. 

I tried this (using Rev 3.0): 

  

on mouseUp 

  put March 12, 2012 into a 

  convert a to seconds -- LC should understand this as midnight 

  get the date 

  convert it to seconds -- should also be midnight 

  put (it - a)/(24*3600) -- elapsed seconds divided by seconds per day 

end mouseUp 

  

This yields 57, which seems right. 

  

But if I change the first line to 

  

  put March 11, 2012 into a 

  

the result is not an integer: 

57.958333 

  

Why would that be? 

  

David Epstein 
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Re: [Bug 10199] New: Office Excel Clipboard Translation

2012-04-30 Thread dfepstein


Perhaps relevant to this thread is this problem I have found while copying in 
Excel, pasting in LC (actually an older version of Rev): 



When you zoom Excel's display, the number formatting changes. E.g., 442593 
becomes 4E+05 if space is too tight, or  if space is really tight. This 
is not a problem while working in Excel, as the underlying data remains the 
same. But contrary to my expectation, if you select cells, copy, and paste 
to Rev you do not get those underlying values. You get only the displayed text. 
 at least tells you something is amiss; but 4E+05 is an unannounced but 
severe amendment from 442593. 

If you paste instead to Notepad, you do get the underlying values 

If you export the Excel sheet as tab delimited text, the results are also 
strange: in my test, values shown in scientific notation were exported as 
integers; but values displayed as  were exported in scientific notation. 



David Epstein
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Re: printing rotated text

2011-12-02 Thread dfepstein


Ben Rubenstein asked 

  Can I just confirm that there's no way to print high-quality 
rotated text from LC?   



Create the field with fontsize 4 times what your want, take a snapshot, rotate, 
paste, and reduce the image's width and length to 25% of the original . 

David Epstein
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