[SynEdit] TCustomSynEdit.MouseDown doesn't get called for RightGutter
!!!
lazarus / 31-LCL

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Pascal · 2015-04-17 13:05

Hello,

does anyone know why TCustomSynEdit.MouseDown doesn't get called
when the mouse is clicked on the right gutter (Part is
TSynGutterLineOverview).
I am not able to get any information if and where mouse is clicked on
right guttter!

Pascal

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Martin_fr · 2015-04-17 14:10

Please report on Mantis.

Technical background is that the overviewgutter is a separate
wincontrol. This helps to reduce painting.

The gutter is supposed to forward events, but that may not have been
fully implemented.

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Pascal · 2015-04-17 16:40

Okay,

this makes sense. I will have a look at it and mybe i can submit a
fix.

Pascal

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Pascal · 2015-04-17 16:58

Martin,

where can i see that TSynGutterLineOverview is a separate WinControl?

It looks like every other gutter:

TSynGutterLineOverview = class(TSynGutterPartBase)
TSynGutterPartBase = class(TSynObjectListItem)
TSynObjectListItem = class(TSynEditFriend)
TSynEditFriend = class(TComponent)
TComponent = class(TPersistent,IUnknown,IInterfaceComponentReference)

BTW: I am using 1.4RC3

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Martin_fr · 2015-04-17 17:29

Code: [Select]  TSynGutterLineOverview = class(TSynGutterPartBase)
  private
    FProviders: TSynGutterLineOverviewProviderList;
    FWinControl: TSynChildWinControl;
....
procedure TSynGutterLineOverview.Init;
begin
...
  FWinControl := TSynChildWinControl.Create(Self);

That will need to override MouseDown/Up etc, and forward it.

Or maybe it can be made to ignore them in the WindProc handler, and
pass them to parent.

The problem is that the overviewgutter invalidates at a different y
pos than the rest of SynEdit.
In cases where the minimum bounding rect will be invalidated/painted
this leads to lots of extra painting (especially during scroll, and
that can visible slow down scrolling).

So this is only needed for painting. All else (hittest, cursor, mouse,
etc) can go to SynEdit.