Flickering

[Enrico Maria Giordano]

Dear friends, is there a way to get a flickering-free resize in the following sample?

Code: Select all | Expand

#include "Fivewin.ch"


FUNCTION MAIN()

    LOCAL oDlg

    DEFINE DIALOG oDlg

    oDlg:nStyle = NOR( oDlg:nStyle, WS_THICKFRAME )

    @ 0, 0 TO 0, 0

    @ 2, 2 SAY "This is a test"

    oDlg:bResized = { || ResizeDlg( oDlg ) }

    ACTIVATE DIALOG oDlg;
             ON INIT ResizeDlg( oDlg );
             CENTER

    RETURN NIL


STATIC FUNCTION RESIZEDLG( oDlg )

    LOCAL oGrp := oDlg:aControls[ 1 ]

    oGrp:Move( 20, 20, oDlg:nWidth() - 40, oDlg:nHeight() - 60, .T. )

    RETURN NIL

Thank you in advance.

EMG

[Colin Haig]

Hi Enrico

STATIC FUNCTION RESIZEDLG( oDlg )

LOCAL oGrp := oDlg:aControls[ 1 ]

oGrp:Hide()
oGrp:Move( 20, 20, oDlg:nWidth() - 40, oDlg:nHeight() - 60, .T. )
oGrp:Show()

RETURN NIL

Colin

[Enrico Maria Giordano]

Thank you. I just tried your suggestion but it's still flickering.

EMG

[nageswaragunupudi]

Group box flickers when resized.
Even when the group box is not resized, it flickers when the container window is resized.
Known issue since long.

[Enrico Maria Giordano]

Thank you.

EMG

[Antonio Linares]

Enrico,

A solution could be to "paint" the groups instead of using real group controls:

Code: Select all | Expand

#include "Fivewin.ch"

FUNCTION MAIN()

    LOCAL oDlg

    DEFINE DIALOG oDlg

    oDlg:nStyle = NOR( oDlg:nStyle, WS_THICKFRAME )

    @ 2, 2 SAY "This is a test"
    
    oDlg:bResized := { || oDlg:Refresh() }

    ACTIVATE DIALOG oDlg;
        ON PAINT WndBox( hDC, 10, 10, oDlg:nHeight() - 49, oDlg:nWidth() - 26 ) ;
        CENTER

RETURN NIL
 

This is just a test. We could use FWH nicer functions to paint the groups.

Also keep in mind that Class TSay does not use double buffer painting, so it will flicker too.

[Enrico Maria Giordano]

This is just a test. We could use FWH nicer functions to paint the groups.

That would be great.

Also keep in mind that Class TSay does not use double buffer painting, so it will flicker too.

Can't you implement double buffer painting for TSay?

EMG

[nageswaragunupudi]

Group control in window can act as a container of controls also.
It has its own advantages to use group as control. We need not code ON PAINT.

Will it help to have a paint method for group control with double buffering?

By the way, TSay does not flicker when window is resized.

[Enrico Maria Giordano]

It flickers in my sample for me.

EMG

[Otto]

Hello,
any news on this.

Thanks in advance
Otto

[Enrico Maria Giordano]

I can't reproduce the problem anymore. It seems it has been fixed somehow.

EMG

[Enrico Maria Giordano]

And I don't remember what I was need it for...

EMG

[Otto]

Hello,
in my case when resizing is finished the controls flicker till they are in the right position.
Is there any solution for this.
Thanks in advance
Otto