I'm just curious why ArrayCtrl::Paint is called three times when drawing the control?
Example: I just slightly modified reference/ArrayCtrl.

struct MyConvert : public Convert {
	Value Format(const Value& v) const {
		ValueArray va = v;
		RDUMP(va[1]);
		return String().Cat() << va[0] << " - " << va[1] << " - " << va[2];
	}
};

The log will contain THREE sets of data.
IMHO, this is a little bit too much from the performance point of view ...

* C:\upp\out\reference\MSVS17.Gui\ArrayCtrl.exe 26.04.2019 10:53:16, user: cxl

v = { ID2: 04/26/2019, ID1: 0, ID3: 0 }
v = { ID2: 04/26/2019, ID1: 10, ID3: 3 }
v = { ID2: 04/26/2019, ID1: 20, ID3: 6 }
v = { ID2: 04/26/2019, ID1: 30, ID3: 9 }
v = { ID2: 04/26/2019, ID1: 40, ID3: 12 }
v = { ID2: 04/26/2019, ID1: 50, ID3: 15 }
v = { ID2: 04/26/2019, ID1: 60, ID3: 18 }
v = { ID2: 04/26/2019, ID1: 70, ID3: 21 }
v = { ID2: 04/26/2019, ID1: 80, ID3: 24 }
v = { ID2: 04/26/2019, ID1: 90, ID3: 27 }
v = { ID2: 04/26/2019, ID1: 100, ID3: 30 }
v = { ID2: 04/26/2019, ID1: 110, ID3: 33 }
v = { ID2: 04/26/2019, ID1: 120, ID3: 36 }
v = { ID2: 04/26/2019, ID1: 130, ID3: 39 }

More details?

va[1] = 0
va[1] = 10
va[1] = 20
va[1] = 30
va[1] = 40
va[1] = 50
va[1] = 60
va[1] = 70
va[1] = 80
va[1] = 90
va[1] = 100
va[1] = 110
va[1] = 120
va[1] = 130
va[1] = 140
va[1] = 150
va[1] = 0
va[1] = 10
va[1] = 20
va[1] = 30
va[1] = 40
va[1] = 50
va[1] = 60
va[1] = 70
va[1] = 80
va[1] = 90
va[1] = 100
va[1] = 110
va[1] = 120
va[1] = 130
va[1] = 140
va[1] = 150
va[1] = 0
va[1] = 10
va[1] = 20
va[1] = 30
va[1] = 40
va[1] = 50
va[1] = 60
va[1] = 70
va[1] = 80
va[1] = 90
va[1] = 100
va[1] = 110
va[1] = 120
va[1] = 130
va[1] = 140
va[1] = 150

mirek wrote on Fri, 26 April 2019 04:54

More details?

XUbuntu 18.10 (XFCE desktop). GCC.

va[1] = 0
va[1] = 10
va[1] = 20
va[1] = 30
va[1] = 40
va[1] = 50
va[1] = 60
va[1] = 70
va[1] = 80
va[1] = 90
va[1] = 100
va[1] = 110
va[1] = 120
va[1] = 130
va[1] = 140
va[1] = 150
va[1] = 0
va[1] = 10
va[1] = 20
va[1] = 30
va[1] = 40
va[1] = 50
va[1] = 60
va[1] = 70
va[1] = 80
va[1] = 90
va[1] = 100
va[1] = 110
va[1] = 120
va[1] = 130
va[1] = 140
va[1] = 150
va[1] = 0
va[1] = 10
va[1] = 20
va[1] = 30
va[1] = 40
va[1] = 50
va[1] = 60
va[1] = 70
va[1] = 80
va[1] = 90
va[1] = 100
va[1] = 110
va[1] = 120
va[1] = 130
va[1] = 140
va[1] = 150

Theoretically, this can be desktop animation (or whatever it is called), but XFCE is a very simple desktop manager, and I couldn't find a place where animation is managed. Probably, XFCE doesn't have it.

My initial suspection is that this is a part of opening the window, when paint gets called more than absolutly necessary number of times....

mirek wrote on Fri, 26 April 2019 11:14

My initial suspection is that this is a part of opening the window, when paint gets called more than absolutly necessary number of times....

Yes, you are right. Paint is called three times when opening the window. This is a generic issue. It is not specific to ArrayCtrl.

Thanks.