One more question. Where can I find documentation for
TControl.ScaleCoord() or ScaleCoord96()? It is not in the CCR. I will
search the source.
Don
On 02/20/2017 11:46 AM, Ondrej Pokorny via Lazarus wrote:
I'd like to announce that I finished the concept of DPI scaling in
Lazarus / LCL.
It's quite easy for the programmer. Documented here:
http://wiki.lazarus.freepascal.org/High_DPI (details are in "High DPI
in Lazarus 1.7 and above").
1.) I made the Lazarus IDE High-DPI aware - the IDE itself and its
windows should scale correctly.
2.) To make your own application use the new LCL scaling and to make
sure your layouts don't get destroyed, do the following:
a.) Make sure you don't change the system DPI settings during the
proccess.
b.) Update the IDE to the latest trunk and rebuild it.
c.) Open your project in the IDE.
d.) Enable LCL scaling for your application DPI awarness in Project
Options -> Application -> "Use LCL scaling (Hi-DPI).
e.) On Windows: enable DPI awarness in Project Options -> Application.
Decide if you want to support per monitor DPI awarness or not.
f.) Make sure TForm.Scaled=True for all your forms (default value).
g.) Make sure you use TControl.ScaleCoord() or ScaleCoord96() to scale
coordinates during the run-time.
And you are ready. Your forms will scale both in runtime and design
time nicely.
For those who followed my last announcement: as Zeljko and Michael
requested, I removed the LCLScaleForms define and introduced the
Application.Scaled property instead (that you set in step 2d). The
default value is Application.Scaled=False.
If you keep Application.Scaled=False, there won't be any changes in
your application.
Please report issues or comment on problems. I have still time to
change things until Lazarus 1.8 is out (you can expect RC1 in April).
Ondrej
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