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sorting a list

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  • A aafcls

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

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    David Crow
    wrote on last edited by
    #7

    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

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    • D 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

      F Offline
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      FarPointer
      wrote on last edited by
      #8

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

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      • F FarPointer

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

        D Offline
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        David Crow
        wrote on last edited by
        #9

        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

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        • D 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

          F Offline
          F Offline
          FarPointer
          wrote on last edited by
          #10

          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

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          • F 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

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            David Crow
            wrote on last edited by
            #11

            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

            F 1 Reply Last reply
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            • D 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

              F Offline
              F Offline
              FarPointer
              wrote on last edited by
              #12

              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

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              • D 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

                A Offline
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                aafcls
                wrote on last edited by
                #13

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

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                • A aafcls

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

                  D Offline
                  D Offline
                  David Crow
                  wrote on last edited by
                  #14

                  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

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                  • D 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

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                    aafcls
                    wrote on last edited by
                    #15

                    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..

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                    • A 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..

                      D Offline
                      D Offline
                      David Crow
                      wrote on last edited by
                      #16

                      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

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                      • A 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..

                        L Offline
                        L Offline
                        led mike
                        wrote on last edited by
                        #17

                        :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

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                        • D 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

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                          aafcls
                          wrote on last edited by
                          #18

                          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?

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                          • A 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?

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                            earl
                            wrote on last edited by
                            #19

                            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

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                            • A 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?

                              D Offline
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                              David Crow
                              wrote on last edited by
                              #20

                              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

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                              • D 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

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                                A Offline
                                aafcls
                                wrote on last edited by
                                #21

                                oh I actually did use InsertItem() when you say to cast lParam1 and lParam2 to where I must have pointed with SetItemData, do I set them to the same pointer value? what makes param1 and param2 unique?

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