Dropping file/directory onto listview

[DorianDarby]

I had an app which had a listbox on it, with which the user could drag files or directories on it. The files were added OK and everything was alright. I decided to use a listview, but I haven't worked out which messages I need to capture when a user does the same drag drop operation. I don't need to worry about the user dragging off the listview (i.e. I don't want them to!)

Has anyone got any ideas?

TIA.

Dorian

[Semen Matusovski]

Dorian --
not sure, that this is optimal solution, but enough simple:
to place listview on modeless dialog with the same size.

   #Compile Exe
   #Register None
   #Dim All
   #Include "WIN32API.INC"
   #Include "COMMCTRL.INC"

   CallBack Function DlgProc
      Static iFile As Long, nFile As Long, TmpAsciiz As Asciiz * %MAX_PATH
      Select Case CbMsg
         Case %WM_DROPFILES
            nFile = DragQueryFile (CbWparam, -1, ByVal 0, 0)
            For iFile = 0 To nFile - 1
               DragQueryFile CbWparam, iFile, TmpAsciiz, SizeOf(TmpAsciiz)
               MsgBox TmpAsciiz
            Next
            DragFinish CbWparam
         Case %WM_INITDIALOG: DragAcceptFiles CbHndl, %True
         Case %WM_DESTROY: DragAcceptFiles CbHndl, %False
      End Select
   End Function

   Function PbMain()As Long
      InitCommonControls
      Dim hDlgMain As Long, hDlg As Long
      Dialog New 0,"Drag and drop",,,300, 250,%WS_SYSMENU Or %WS_THICKFRAME Or %DS_CENTER, To hDlgMain
      Dialog New hDlgMain, "", 10, 25, 280,170, %WS_CHILD To hDlg
      Control Add "SysListView32", hDlg, 101, "", 0, 0, 280, 170, %WS_CHILD Or %WS_VISIBLE, %WS_EX_CLIENTEDGE
      Dialog Show Modeless hDlg Call DlgProc
      Dialog Show Modal hDlgMain
   End Function

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[DorianDarby]

I tried that out, and it works OK. The problem is that the listview cannot be the same size as the form, and unfortunately I can only get the form to respond to drop events. I used Spy++ (with Visual Studio) to see what messages were being sent to my listview. %WM_DROPFILES was among them, but I don't know how to detect this message.

In my message handler, I've got the usual code:

Select case wMsg
...
...
Case %WM_DROPFILES


This only detects the %WM_DROPFILES sent to the form, and not directly sent to the listview.

Does anyone know how I could get this working?

Cheers!

Dorian.


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[Semen Matusovski]

Originally posted by DorianDarby:
The problem is that the listview cannot be the same size as the form

Sounds very strange. I told about modeless dialog, not abot whole form.
I added some buttons/textboxes to make my idea more clear.
Drag&Drop zone is ListView' area only.

   #Compile Exe
   #Register None
   #Dim All
   #Include "WIN32API.INC"
   #Include "COMMCTRL.INC"
   
   Global hDlgMain As Long, hDlg As Long
   CallBack Function DlgProc
      Static iFile As Long, nFile As Long, TmpAsciiz As Asciiz * %MAX_PATH
      Select Case CbMsg
         Case %WM_DROPFILES
            nFile = DragQueryFile (CbWparam, -1, ByVal 0, 0)
            For iFile = 0 To nFile - 1
               DragQueryFile CbWparam, iFile, TmpAsciiz, SizeOf(TmpAsciiz)
               MsgBox TmpAsciiz
            Next
            DragFinish CbWparam
         Case %WM_INITDIALOG: DragAcceptFiles CbHndl, %True
         Case %WM_DESTROY: DragAcceptFiles CbHndl, %False
      End Select
   End Function
   Function PbMain()As Long
      InitCommonControls
      Dialog New 0,"Drag and drop", , , 300, 250,%WS_SYSMENU Or %WS_CAPTION Or %WS_THICKFRAME Or %DS_CENTER, To hDlgMain
      Control Add TextBox, hDlgMain, 102, "", 10, 5, 280, 15, , %WS_EX_CLIENTEDGE
      Control Add TextBox, hDlgMain, 103, "", 10, 30, 280, 15, , %WS_EX_CLIENTEDGE
      Control Add Button, hDlgMain, 104, "Button1", 10, 215, 120, 15
      Control Add Button, hDlgMain, 105, "Button2", 170, 215, 120, 15
      Dialog New hDlgMain, "", 10, 75, 280, 120, %WS_CHILD To hDlg
      Control Add "SysListView32", hDlg, 101, "", 0, 0, 280, 120, %WS_CHILD Or %WS_VISIBLE, %WS_EX_CLIENTEDGE
      Dialog Show Modeless hDlg Call DlgProc
      Dialog Show Modal hDlgMain
   End Function

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