Image control in a Background

Tue Jun 24 18:23:41 EDT 2014

Hi

Your comments:

The "then" is superfluous, so its removal shouldn't affect anything. A
"then" can only occur at the end of a line that begins with "if". The
engine must be ignoring the extra "then" because it isn't throwing an
error. At any rate, you don't need it.
Question:
Not new to coding but new to LiveCode scripting, I have a don't ask
questions approach to code suggestions from other scripters. I've seen a
lot of odd behavior in scripts within live code. For some a nude live code,
it was nothing like coding I've done before and I go all the way back to
the first basic on XT computers. It appeared to me that when I removed the
then from line of script it had an effect on the image control. I am not
questioning which are telling me, I just found it interesting that it had
an effect on the way the script ran.

Previously I believe you had the image in a background group with "act like
a background" turned on, which means the same image will appear on every
card that contains that background. I think you've changed that now by
turning off "act like a background" or by moving the image out of the
group. That is why only one card updates now.
 Question:
I used HyperCard in the old days, and I recognize that live code manages
backgrounds differently. I have never fully understood the limits about
background objects and the settings. This is a good example of that where a
group of objects included the image control so that each new card created
would include the image control. The gray area I have at this point is, how
to manage an image control where it needs to be on each card, but not
contain the same image when it is edited and replaced on all cards. I think
it's an interesting result that a image control cannot display a different
image on each new card. I haven't seen this limitation referenced anywhere
until now in this email. If I read what you're telling me correctly, if I
include the image control in the group background in acts differently? Is
it possible to have a image control separate from the group background?
This would mean I should include a separate image control in its own
background? And that background settings would be different in that it
would not act like a background?
Or, using scripting I would need to address a on closeCard script to manage
what is saved to the image control. These questions may sound naïve, but I
can imagine that all new users have questions just like this.

The reason you need to leave the card and return in order to see the new
image content is because you have placed the command in an openCard
handler, which only triggers when you arrive at the card. Leaving and
returning to the card will cause an openCard message to be sent, which
updates the image content.
Question:
To be honest, every time I start building a new script to perform a task, I
need to start searching for syntax reference, or examples. Unlike a lot of
the seasoned developers like my friend John Dixon who can pull scripts out
of the air, it takes me quite a bit longer to pull together the script
structure. That being said, that is why I was creating my own app
dictionary where I could search a word or phrase that would give me script
structures that could work to perform tasks. I often ponder how seasoned
developers of liveCode learned liveCode. The answer I get is it just takes
a long time to learn?
This doesn't solve the current issue though carrying on a conversation
about my learning curve.
So based on your comments in this email, I either need to include in on
closeCard script, or to change the way the image control works within the
background.
Frankly I don't see why standard items like an image control doesn't
include the ability to save different images in a grouped background. This
seems to be a logical feature that should be included in the image control
settings.
You might be able to tell by my comments that I am clueless as to the next
step to correct the image control to save different images on each card.
 It appears to me that the reference script data I included in the first
email is close to what I need to correct the image editing and saving on
each card? But it would help if you could suggest the next steps I need to
take to solve the image control issue.

Thank you

Vaughn Clement

Apps by Vaughn Clement (Support)
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On Tue, Jun 24, 2014 at 2:41 PM, J. Landman Gay <jacque at hyperactivesw.com>
wrote:

> On 6/24/2014, 10:35 AM, Vaughn Clement wrote:
>
>> I am somewhat closer to the solution? I tested the correction that J.
>> Landman Gay suggested where I remove the "then" at the end of the this
>> line:  "set the defaultfolder to specialFolderPath ("documents") &
>> "/photos/" then <--"
>> This had the effect of not updating the image in any card. When I added it
>> back in, the image control will not change all of the cards now, but it
>> will not update the current image either until I go to a different card
>> and
>> return to find the image then updated to the correct image.
>>
>
> The "then" is superfluous, so its removal shouldn't affect anything. A
> "then" can only occur at the end of a line that begins with "if". The
> engine must be ignoring the extra "then" because it isn't throwing an
> error. At any rate, you don't need it.
>
> Previously I believe you had the image in a background group with "act
> like a background" turned on, which means the same image will appear on
> every card that contains that background. I think you've changed that now
> by turning off "act like a background" or by moving the image out of the
> group. That is why only one card updates now.
>
> The reason you need to leave the card and return in order to see the new
> image content is because you have placed the command in an openCard
> handler, which only triggers when you arrive at the card. Leaving and
> returning to the card will cause an openCard message to be sent, which
> updates the image content.
>
>
> --
> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
> HyperActive Software           |     http://www.hyperactivesw.com
>
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