[SOLVED] Splitter causes lines in the form

[Hansvb]

Hi,

On a Form I have a few panels and a few splitters. When i drag a slpitter  to the right a lot of lines apear in the form. Double buffered is on. How can i avoid this? See print screen.
Windows 11  and lazarus 2.2.4.

[jamie]

call the Repaint even for the parent control during the Onpaint of this control.

or call the Repaint of the parent in the onMoved event .

You can also call it during the OnChangeBounds etc.

[Hansvb]

Repaint the parent did it. It was that simple.
Thanks.

[wp]

Maybe you overlooked this property like me for many years: The Splitter has a ResizeStyle property which determines the behavour on resizing. The default value rsUpdate causes the adjacent controls to update their size immediately, and I know many cases where this causes a lot of flicker or a stuttering visual impression. I find it is more advantageous when ResizeStyle is at rsLine or rsPattern which just draws a line or a patterned narrow bar, respectively, at the new position and performs the resize operation only at the end.

[Hansvb]

Hi wp, that seems to work to. I did not notice that property.