sorting a list

aafcls

Hello, I have a list control item with a given amount of columns and respective headers. I would now like to add some sorting functionality, where, upon clicking the header of the respective column, it sorts alphabetically. Are there any functions to accomplish this?

FarPointer

BOOL SortItems( PFNLVCOMPARE pfnCompare, DWORD_PTR dwData ); Regards, FarPointer Blog:FARPOINTER

Zac Howland

You'll have to create a compare function to handle how it will sort the items, but after that you can just call SortItems. See the MSDN documentation for details and an example. If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week Zac

David Crow

aafcls wrote:

Are there any functions to accomplish this?

See here.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

aafcls

okay but what action item will take care of the header clicking functionality, because from there I can call sorting method.

FarPointer

NM_RCLICK Regards, FarPointer Blog:FARPOINTER

David Crow

In your CListView/CListCtrl-derived class, provide a handler for the HDN_ITEMCLICK notification. Call the SortItems() method from there. See here for more.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

FarPointer

Please check this out :- http://www.codeguru.com/Cpp/controls/listview/columns/article.php/c985/[^] Regards, FarPointer Blog:FARPOINTER

David Crow

FarPointer wrote:

Please check this out :-

Why (send this to me)? I know very well how to sort a list control.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

FarPointer

Well to first add the notification for HDN_ITEMCLICK is tough:- why because the on notify macro is as follows ON_NOTIFY( wNotifyCode, id, memberFxn ) and the id of the header control is zero unless explicitly set . Regards, FarPointer Blog:FARPOINTER

David Crow

FarPointer wrote:

Well to first add the notification for HDN_ITEMCLICK is tough:-

Compared to what, chewing gum? It gets added to the message map just like any other. How's that tough?

FarPointer wrote:

why because the on notify macro is as follows ON_NOTIFY( wNotifyCode, id, memberFxn )

Yeah, so?

FarPointer wrote:

...the id of the header control is zero unless explicitly set .

Of course it's zero, and has been since the control's inception. Why would it need to be anything else?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

FarPointer

Well not compared to chewing gum :-D ya my mistake i was expecting the message map to be like this:- ON_NOTIFY( HDN_ITEMCLICK, 0, OnHeaderClick) but it will be like this i guess ON_NOTIFY( HDN_ITEMCLICK, IDC_LIST, OnHeaderClick) Regards, FarPointer Blog:FARPOINTER

aafcls

are there any available comparison functions just for a simple list control for a clicked-on header, to be passed to SortItem?

David Crow

Other than the one I already provided? It doesn't get much simpler.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

aafcls

are you referring to the CompareFunction in the article you sent? in that case, would I have to make use of "GetItemText" to fill in the "items" in CompareFunction? i'm just not sure how to implement this with a list of unknown quantity of items..

David Crow

aafcls wrote:

in that case, would I have to make use of "GetItemText"

No. You would cast lParam1 and lParam2 to the appropriate pointer value (the pointer value used with SetItemData()).

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

led mike

:confused:

aafcls wrote:

unknown quantity of items

Do you not understand that sort will be called from inside a sorting algorithm and you don't need to be concerned with the quantity of items?

"Just about every question you've asked over the last 3-4 days has been "urgent". Perhaps a little planning would be helpful?"
Colin Angus Mackay in the C# forum

led mike

aafcls

I am very sorry I do not understand. I do not make use of SetItemData(). All I have is my list control where I have a few InsertColumn()s and SetItemText() accordingly. When you tell me to cast these as pointers int CALLBACK CompareFunction(LPARAM lParam1, LPARAM lParam2, LPARAM lParamSort) ...pointing to what exactly?

earl

Have you tried the sample code in the link David Crow gave you? They probably point to either an LVITEM or some MFC wrapper class. This information was obtained by reading the docs for the CListCtrl class; you get there by clicking up from DC's link. earl

David Crow

aafcls wrote:

I do not make use of SetItemData().

But you must, if SortItems() is to be used, as it internally calls GetItemData().

aafcls wrote:

All I have is my list control where I have a few InsertColumn()s and SetItemText() accordingly.

You'll also need to use InsertItem().

aafcls wrote:

...pointing to what exactly?

Whatever pointer value you used with SetItemData().

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb