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Home » U++ Library support » U++ Library : Other (not classified elsewhere) » Opening window during Drag-Drop crashes app.

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Opening window during Drag-Drop crashes app. [message #10371]

Wed, 04 July 2007 15:43

mrjt is currently offline

mrjt
Messages: 705
Registered: March 2007
Location: London

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I think this is due to the refactoring of the DnD mentioned here as this definitely not happen with 705-dev3. The reversing of the calling order seems to trigger some sort of infinite recursion/loop that only ends when Windows runs out of resources and CreateWindow fails.

It is very easy reproduce, just add a PromptOK to the ColumnListDnD example like so:

	void DropSum(int ii, PasteClip& d) {
		if(AcceptInternal<ColumnList>(d, "mydrag")) {
			const ColumnList& src = GetInternal<ColumnList>(d);
			int sum = 0;
			for(int i = 0; i < src.GetCount(); i++)
				if(src.IsSel(i))
					sum += atoi(~String(src[i]));
			list.Set(ii, AsString(sum));
			d.SetAction(DND_COPY);
			list.SetCursor(ii);
			PromptOK("Sum");
		}
	}

This breaks a major application where I frequently use Prompts to get confirmation for Drag-Drops before completion (as they initiate a database update). So I would be grateful for a fix Smile

Smile

(Its a bit beyond me).

Cheers,
James

[Updated on: Wed, 04 July 2007 15:44]

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Re: Opening window during Drag-Drop crashes app. [message #10387 is a reply to message #10371]

Thu, 05 July 2007 07:57

mirek is currently offline

mirek
Messages: 14258
Registered: November 2005

Ultimate Member

Fixed. However, one problem remains - the arrow cursor keeps its D&D image override. Hopefully I will look into this later today....

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Re: Opening window during Drag-Drop crashes app. [message #10388 is a reply to message #10387]

Thu, 05 July 2007 11:25

mrjt is currently offline

mrjt
Messages: 705
Registered: March 2007
Location: London

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Can't I just use

Ctrl::OverrideCursor(Image());

Thanks for the quick fix.
James

[Updated on: Thu, 05 July 2007 11:27]

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Re: Opening window during Drag-Drop crashes app. [message #10393 is a reply to message #10388]

Thu, 05 July 2007 18:21

mirek is currently offline

mirek
Messages: 14258
Registered: November 2005

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mrjt wrote on Thu, 05 July 2007 05:25

Can't I just use

Ctrl::OverrideCursor(Image());

Most likely yes, but it should work without such troubles...

Mirek

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Re: Opening window during Drag-Drop crashes app. [message #10394 is a reply to message #10388]

Thu, 05 July 2007 20:09

mirek is currently offline

mirek
Messages: 14258
Registered: November 2005

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mrjt wrote on Thu, 05 July 2007 05:25

Can't I just use

Ctrl::OverrideCursor(Image());

Thanks for the quick fix.
James

OK, now fixed this too.

In fact, the fix was placing above into "Drop" handler Wink

Wink

Mirek

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