I'm creating an customized control, and have such hint when creating form with such control:

[HINT] TWinControl.CreateWnd creating Handle during loading Form1:TForm1 csDesigning=False

Is this something bad , or I can live with it ?

It's bad.
It creates a lot of unneeded overhead.
As long as the control is csloading, csdestroying or not becomes visible a Handle is not needed and should not be created.

Use 'if csLoading in ComponentState' to find out if it is still loading. Loading is finished when 'procedure Loaded;' is called. You can override that.

Mattias

better to use

if HandleAllocated then
  DoSomeOperationWith(Handle)

Handle will be created when your control become visible - before that you should not use Handle property.

Best regards,
Paul Ishenin.

This is exact what I'm using, and got that bad HINT message.

Replace
DoSomeOperationWith(Handle)
with

  DoSomeOperationThatNeedsAHandle;

For example any Canvas operation needs a handle.

> Handle will be created when your control become visible - before > that you should not use Handle property.

Mattias

Is allowed to access event?

Luiz

tnx, I've found Loaded() satisfies my needs - for runtime, but Loaded() isnt' called during design time ? so ... what to call here ?

error ! it is called during design time, but not first time when I drop new control on to form (i can see my control, but without default settings - it's empty) - I've fixed this by overriding UpdateShowing, and calling defaults when HandleAllocated.

I hope, you mean 'override' not to 'call'.
Loaded must *only* be called TReader.

Loaded is called during designtime too. Otherwise you found a bug.

Mattias

Yes, with 'if HandleAllocated then'.

Mattias

Maybe what you search a method, when your control got a Handle? It's CreateWnd. Override that.

Mattias

yes , I mean 'overrde' I don't call Loaded() ;)

Loaded is called during designtime too. Otherwise you found a bug.

Not when you drop control on to form for the first time. Later, when you start that project, then it properly calls Loaded(). So it could be a bug.

I see.
No that's, not a bug. Loaded is called after the lfm data has been transmitted. No lfm data - no Loaded.
If you tell, what you are trying to do, I can tell you what method to override.

Mattias

I'm creating new component on component palette :) (qt only component), everything works fine, bug when I drop it for the first time on the form it doesn't load it's properties (it is QTableWidget), so it have to load rowcount, colcount etc .... it looks empty - no rows, no cols, white colored etc ...(OI is filled OK with props).
After saving project, and restating laz ide (yes, now Loaded() is called) , I can see all clearly.
No problems during runtime, designtime only.

When your QTTableWidget is created it should pull all values from the 'LCL' control. OR: you can override CreateWnd of your LCL control and push all values.

Mattias