any Event when changing page width

hi all,
is there any event when settingpage button clicked in preview form, and page size or page orientation changed?

i want to print some different picture with different sizes.
for example when a picture is smaller then A4 and when it print in A4, it must normally print,
but when that image is printing in A5 the image must stretched to print the image correctly,
so i want an event to find out when size of paper in preview form changed,

thanks in advise,
best regards,
farhad.f

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