Function gtk::functions::cairo_should_draw_window

pub fn cairo_should_draw_window(cr: &Context, window: &Window) -> bool

This function is supposed to be called in signal::Widget::draw implementations for widgets that support multiple windows. cr must be untransformed from invoking of the draw function. This function will return true if the contents of the given window are supposed to be drawn and false otherwise. Note that when the drawing was not initiated by the windowing system this function will return true for all windows, so you need to draw the bottommost window first. Also, do not use “else if” statements to check which window should be drawn.

cr

a cairo context

window

the window to check. window may not be an input-only window.

Returns

true if window should be drawn