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Update comments of Fl_Cocoa_Window_Driver::make_current() for macOS 10.14

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ManoloFLTK 2019-04-11 13:04:53 +02:00
parent 86ddfca2f3
commit 3fa2b73698
1 changed files with 11 additions and 8 deletions
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src/Fl_cocoa.mm
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@ -3346,18 +3346,21 @@ void Fl_Cocoa_Window_Driver::resize(int X, int Y, int W, int H) {
This can be called in 3 different instances:
1) When a window is created or resized.
The system sends the drawRect: message to the window's view after having prepared the current
graphics context to draw to this view. Processing of drawRect: sets variable through_drawRect
to YES and calls Fl_Cocoa_Window_Driver::flush().
Fl_Cocoa_Window_Driver::flush() sets through_Fl_X_flush
to YES and calls Fl_Window::flush() that calls Fl_Window::make_current() that
Before 10.14: The system sends the drawRect: message to the window's view after having prepared the current
graphics context to draw to this view. Processing of drawRect: sets variable through_drawRect
to YES and calls Fl_Cocoa_Window_Driver::flush() that sets through_Fl_X_flush
to YES and calls Fl_Window::flush().
After 10.14: The system sends the displayLayer: message to the window's view.
Variable through_Fl_X_flush is set to YES and Fl_Window_Driver::flush() is called
which calls Fl_Window::flush().
Fl_Window::flush() calls Fl_Window::make_current() that
uses the window's graphics context. The window's draw() function is then executed.
2) At each round of the FLTK event loop.
Fl::flush() is called, that calls Fl_Cocoa_Window_Driver::flush() on each window that needs drawing.
Variable through_Fl_X_flush is set to YES. Fl_Cocoa_Window_Driver::flush() locks the focus to the
view and calls Fl_Window::flush() that calls Fl_Window::make_current() which uses the window's
graphics context. Fl_Window::flush() then runs the window's draw() function.
Fl_Cocoa_Window_Driver::flush() [Before 10.14: locks the focus to the
view and] calls Fl_Window_Driver::flush() that calls Fl_Window::make_current()
and proceeds as in 1).
3) An FLTK application can call Fl_Window::make_current() at any time before it draws to a window.
This occurs for instance in the idle callback function of the mandelbrot test program. Variable