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The first technique, painting, is the common approach to handling output in most windowing systems, aside from particular graphics-oriented programs that store the form's whole image in a bitmap.
The approach used to implement painting has a very descriptive name: store and paint.
In the VCL, this is covered by a troika of methods on TControl: That said, sometimes it isn’t even necessary to call one of these methods if the control wraps a native API widget, and the native API does something special behind the scenes.
In doing so the event handler will need to be tweaked a bit, mainly because the FMX TProgress Bar uses Single not Integer values for its progress values: What does ‘work’ is adding a call to Application. Further, on OS X, trying something similar appears to confuse the FMX styling system, so all in all…
By increasing the color count or the number of pixels, you can easily reach 4 MB of memory for a 1280×1024 resolution at 16 million colors.
In the event that you want to have consistent output for your applications, you can use two techniques.
VCL controls can call Invalidate() to be placed into a queue for repainting. Fire Monkey controls have a Repaint() method, but AFAICT that forces the control to be repainted immediately.
When the window is covered, its contents are usually lost.
The general solution is to store enough data about the output to be able to reproduce it when the system sends a painting requested.
An alternative approach is to save the output of the form in a bitmap while you produce it, by placing an Image component over the form and drawing on the canvas of this image component.
Elapsed Milliseconds To see this, try reimplementing the VCL demo presented above. Nonetheless, on Windows it is possible to process paint messages for a FMX form using something like the following code: You have to do things at the form level since a FMX control on Windows isn’t backed by its own HWND.
Process Messages, as its name implies, processes all messages currently outstanding (paint and otherwise) for all controls (and if there are any other message-handling primitives in the application, those too), which can soon lead to serious re-entrancy issues. Unfortunately the person who mans QC hasn’t understood the point of it, and I wouldn’t be surprised if there are other similar reports on the system.