At the request of a couple of members, I've updated my
splitter bar code to support up to 6 different layouts. Just
select a menu option to change the laout.

It allows fixed splitter bar positions or percentage-based splitter
bar positions. Resizing the dialog also resizes the controls.

The basic layout is with 3 controls - 2 on top, 1 on bottom.
By selecting a menu choice you can change the layout,
including two options which hide one of the controls.

This version shows how to handle the presence of a menu,
toolbar and statusbar.



The code is provided below, and is also available in the
gbSnippets PowerBASIC source code library (snippet# gbs_00392).
You can get the entire library by downloading gbSnippets or you
can view individual snippets online.

gbSnippets home page: http://www.garybeene.com/sw/gbsnippets.htm
Online source code listings: http://www.garybeene.com/power/code/

If you've already installed gbSnippets, you can ensure that your local
library is synchronized with the latest snippets on the gbSnippets server
by using the "Actions/Synchronize with gbSnippets Server" menu.

Finally, here's a direct link to the gbsnippets.pbr resource file use in this code:
http://www.garybeene.com/files/gbsnippets.pbr


Code:
Splitter Bars II

'Allowing a user to change an application's layout, or to change the size of various
'sections of a layout is a very common feature of GUI applications.  This snippet
'shows how it can be done and includes the following features.

   '1. Horizontal and vertical splitter bars, displaying up to controls.
   '2. 6 different layout options (some with 2 controls, others with 3 controls).
   '3. Splitter bars can have fixed position or be positioned on a percentage basis

'Primary Code; 
'The code sections/functions used in the compilable example below are:
'1. %WM_SetCursor - detects mouse clicks and movement
'2. Sub MoveBarUpDown - moves horizontal bar in response to mouse action
'3. Sub MoveBarLeftRight - moves vertical bar in response to mouse action
'4. Sub ResizeWindow - sets splitterbar location/size, and control visiblity/location/size

'A mouse is used to drag/move either splitter bar, which resets the
'fixed/percentage position of the splitter bar.  When the dialog is resized, the
'current splitter bar positions (fixed/percentage) are maintained.  Label controls
'are used as the splitter bars - one for vertical splitting and one for horizontal splitting.

'Due to the length of this example, on a description will be covered in this section.
'See the compilable example below for the source code.


'Compilable Example:
'In this example, up to 6 layout options may be selected. The splitter bars (label controls)
'are colored red/blue for visiblity, but an application typically uses colors which match the 
'background color of the dialog in order to render the splitter bars invisible - except as the
'mouse cursor changes when it passes over the splitter bars.
#Compile Exe
#Dim All
#Debug Error On     'catch array/pointer errors - OFF in production
#Debug Display On   'display untrapped errors   - OFF in production
#Include "Win32api.inc"
#Resource "gbsnippets.pbr"

' Equates =============================================================
%IDC_Left = 500 : %IDC_Right = 501 : %IDC_Bottom = 502
%IDC_LabelH = 503 : %IDC_LabelV = 504 : %IDC_StatusBar = 505
%IDC_Toolbar = 506 : %IDM_Fixed = 507 : %IDT_New = 508 : %ID_ImageList = 509
%IDT_X = 701 : %IDT_Y = 702 : %IDT_Z = 703
%IDM_1 = 601 : %IDM_2 = 602 : %IDM_3 = 603
%IDM_4 = 604 : %IDM_5 = 605 : %IDM_6 = 606 : %IDM_Sep = 607

' Global Variables =============================================================
Global hDlg As Dword, hTree As Dword, hList As Dword, hMenu As Dword
Global SplitVInWork As Long, SplitHInWork As Long, hMenuOptions As Dword
Global XSplit As Single, YSplit As Single, hLst As Dword
Global HBarLeft As Long, VBarTop As Long, Layout&, FixedSplitterBar&

             
' Main Function =======================================================================
Function PBMain()
    Dialog New Pixels, 0, "Splitter Text",300,300,410,340, %WS_OverlappedWindow Or %WS_ClipChildren To hDlg
    Dialog Set Icon hDlg, "aainfo"
    Control Add StatusBar, hDlg, %IDC_StatusBar, "",0,0,0,0     'xy, xxyy ignored, %ccs_bottom by default
    Control Add Toolbar, hDlg, %IDC_Toolbar, "Toolbar",0,0,0,0                    'xy, xxyy, txt$ ignored, %ccs_top by default
    'create imagelist for Toolbar
    ImageList New Icon 16,16,32,3 To hLst
    ImageList Add Icon hLst, "x"              '1
    ImageList Add Icon hLst, "y"              '2
    ImageList Add Icon hLst, "z"              '3
    'attach imagelist
    Toolbar Set ImageList hDlg, %IDC_Toolbar, hLst, 0
    'create buttons
    Toolbar Add Button  hDlg, %IDC_Toolbar, 1, %IDT_X, %TbStyle_Check, "X"
    Toolbar Add Button  hDlg, %IDC_Toolbar, 2, %IDT_Y, %TbStyle_Check, "Y"
    Toolbar Add Button  hDlg, %IDC_Toolbar, 3, %IDT_Y, %TbStyle_Check, "Z"
    
    'create menu
    Menu New Bar To hMenu
    Menu New Popup To hMenuOptions
    Menu Add Popup, hMenu, "&Options", hMenuOptions, %MF_Enabled
    Menu Add String, hMenuOptions, "1 Left Beside Right over Bottom, Bottom Left-to-Right", %IDM_1, %MF_Enabled
    Menu Add String, hMenuOptions, "2 Left over Bottom - Right Top-to-Bottom", %IDM_2, %MF_Enabled
    Menu Add String, hMenuOptions, "3 Left Beside Right, No Bottom", %IDM_3, %MF_Enabled
    Menu Add String, hMenuOptions, "4 Left Beside Right under Bottom, Bottom Left-to-Right", %IDM_4, %MF_Enabled
    Menu Add String, hMenuOptions, "5 Right over Bottom - Left Top-to-Bottom", %IDM_5, %MF_Enabled
    Menu Add String, hMenuOptions, "6 Left over Right, No Bottom", %IDM_6, %MF_Enabled
    Menu Add String, hMenuOptions, "-", %IDM_Sep, %MF_Enabled
    Menu Add String, hMenuOptions, "Fixed Position Splitter Bars", %IDM_Fixed, %MF_Enabled
    Menu Attach hMenu, hDlg   

    'add the controls + splitter bars (labels)
    Control Add TextBox, hDlg, %IDC_Left, "TopLeft",  20, 80, 160, 80
    Control Add TextBox, hDlg, %IDC_Bottom, "Bottom",  20, 200, 370, 90
    Control Add TextBox, hDlg, %IDC_Right, "TopRight", 220, 55, 170, 100
    Control Add Label, hDlg, %IDC_LabelH, "",  200, 45, 6, 125, %SS_Notify , %WS_Ex_ClientEdge  ' up/down - does horizontal split
    Control Add Label, hDlg, %IDC_LabelV, "",  0,170, 410, 6, %SS_Notify , %WS_Ex_ClientEdge   ' left/right - does vertical split
    Control Set Color hDlg, %IDC_LabelV, %Black, %Red
    Control Set Color hDlg, %IDC_LabelH, %Black, %Blue

    'initial values
    XSplit = 0.5 : YSplit = 0.5 : HBarLeft = 100 : VBarTop = 100 : Layout& = 1

    Dialog Show Modal hDlg Call DlgProc()
End Function

'monitor mouse movement=================================
CallBack Function DlgProc() As Long
Local iReturn As Long, x as Long, y as Long, w as Long, h as Long
   Select Case CB.Msg
      Case %WM_Command
         Select Case CB.Ctl
            Case %IDM_1 : Layout& = 1 : ResizeWindow
            Case %IDM_2 : Layout& = 2 : ResizeWindow
            Case %IDM_3 : Layout& = 3 : ResizeWindow
            Case %IDM_4 : Layout& = 4 : ResizeWindow
            Case %IDM_5 : Layout& = 5 : ResizeWindow
            Case %IDM_6 : Layout& = 6 : ResizeWindow
            Case %IDM_Fixed
               FixedSplitterBar& = FixedSplitterBar&  XOR 1     'flip between 0 and 1
               Menu Set State hMenuOptions, ByCmd %IDM_Fixed, FixedSplitterBar& * 8            
               Dialog Get Client hDlg To w,h
               'adjusts VBarTop/HBarLeft or xSplit/ySplit when option is changed
               'both are not kept current at all times - only the pair in use
               If FixedSplitterBar& Then
                  VBarTop = h - ySplit * h
                  HBarLeft = xSplit * w
               Else
                  ySplit = (h-VBarTop) / h
                  xSplit = HBarLeft / w
               End If
               ResizeWindow
            Case %IDT_X, %IDT_Y, %IDT_Z
               MsgBox "No action. Toolbar included just to show how splitter bars work with toolbar in place.", %MB_OK + %MB_IconInformation, "Toolbar Button Pressed"
         End Select
      Case %WM_Size
         ResizeWindow
      Case %WM_SetCursor
            iReturn = GetDlgCtrlID (CB.wParam)
            'identify over which label control the mouse action took place
            If iReturn = %IDC_LabelH Then MousePTR 9 : Function = 1    '9 = horizontal cursor
            If iReturn = %IDC_LabelV Then MousePTR 7 : Function = 1    '7 = vertical cursor

            'monitors the 3 basic splitter bar mouse actions, lbuttondown, mousemose, lbuttonup
            Select Case Hi(Word, CB.lParam) 
               Case %WM_LButtonDown
                  'sets flags to say splitter action has started (no actual movement yet)
                  If iReturn = %IDC_LabelV Then SplitVInWork = 1
                  If iReturn = %IDC_LabelH Then SplitHInWork = 1
               Case %WM_MouseMove
                  'Repositions splitter bars to match mouse position (if position has changed)
                  If SplitVInWork Then If MoveBarUpDown Then ResizeWindow
                  If SplitHInWork Then If MoveBarLeftRight Then ResizeWindow
               Case %WM_LButtonUp      
                  'sets flags to say splitter action has ended
                  SplitHInWork = 0 : SplitVInWork = 0
            End Select
   End Select
End Function

Function MoveBarUpDown As Long
    Local pt As Point, h As Long, w As Long
    Static oldY As Long
    Dialog Get Client hDlg To w,h
    GetCursorPos pt               'pt has xy screen coordinates
    ScreenToClient hDlg, pt       'pt now has client coordinates
'    If h-pt.y < 50 Then Exit Function   'limit right motion   'optional
'    If pt.y < 50 Then Exit Function                            'optional
    YSplit = (pt.y-3) / h         'actually, should only do one or the other
    VBarTop = h - (Pt.y-3)        'actually, should only do one or the other
    If pt.y <> oldY Then Function = %True : oldY = pt.y
End Function

Function MoveBarLeftRight As Long
    Local pt As Point, h As Long, w As Long
    Static oldX As Long
    Dialog Get Client hDlg To w,h
    GetCursorPos pt               'pt has xy screen coordinates
    ScreenToClient hDlg, pt       'pt now has client coordinates
'    If w-pt.x < 50 Then Exit Function   'limit right motion       'optional
'    If pt.x < 50 Then Exit Function                                 'optional
    XSplit = (pt.x-3) / w        'actually, should only do one or the other
    HBarLeft = pt.x-3            'actually, should only do one or the other
    If pt.x <> oldX Then Function = %True : oldX = pt.x
End Function

Sub ResizeWindow
   Local vx As Long, vy As Long, hx As Long, hy As Long, h As Long, w As Long, HLeft&, VTop&
   Local yToolbar as Long, yStatusBar as Long, M as Long, T as Long

   Local yStatus as Long, yTool as Long
   Control Get Size hDlg, %IDC_StatusBar To w,yStatus
   Control Get Size hDlg, %IDC_Toolbar To w,yTool
   Dialog Get Client hDlg To w,h
   M = 5   'margin around controls
   T = 6    'splitter thickness (smallest dimension)

   'get the splitter bar positions - top of vertical splitter (VTop) and
   'left of horizontal splitter (HLeft).  These will be used in positioning
   'controls on the dialog.  Result depends on whether fixed or percentage
   'positioning is selected by the user.
   If FixedSplitterBar& Then
      VTop = h - VBarTop
      HLeft = HBarLeft
   Else
      VTop = ySplit*h
      HLeft = xSplit*w
   End If
 
   Select Case Layout&         'Function Layout returns a value 1-6
      Case 1    'left beside right, both above bottom
         'visibility
         Control Show State hDlg, %IDC_LabelH, %SW_Show
         Control Show State hDlg, %IDC_LabelV, %SW_Show
         Control Show State hDlg, %IDC_Bottom, %SW_Show

         'H splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelH, HLeft, yTool + M
         Control Set Size hDlg, %IDC_LabelH, T, VTop - yTool - M

         'V splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelV, M, VTop
         Control Set Size hDlg, %IDC_LabelV, w - 2*M, T

         'Left size/loc
         Control Set Loc  hDlg, %IDC_Left, M, yTool + M
         Control Set Size hDlg, %IDC_Left, HLeft - 2*M, VTop - yTool - 2*M

         'Right size/loc
         Control Set Loc  hDlg, %IDC_Right, HLeft + T + M, yTool + M
         Control Set Size hDlg, %IDC_Right, w - HLeft - 2*M - T, VTop - yTool - 2*M

         'Bottom size/loc
         Control Set Loc  hDlg, %IDC_Bottom, M, VTop + T + M
         Control Set Size hDlg, %IDC_Bottom, w - 2*M, h - VTop - yStatus - 2*M - T


      Case 2    'left over bottom, right top-to-bottom
         'visibility
         Control Show State hDlg, %IDC_LabelH, %SW_Show
         Control Show State hDlg, %IDC_LabelV, %SW_Show
         Control Show State hDlg, %IDC_Bottom, %SW_Show

         'H splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelH, HLeft, yTool + 5
         Control Set Size hDlg, %IDC_LabelH, T, h - yTool - yStatus - 2*M

         'V splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelV, M, VTop
         Control Set Size hDlg, %IDC_LabelV, HLeft - M, T

         'Left size/loc
         Control Set Loc  hDlg, %IDC_Left, M, yTool + M
         Control Set Size hDlg, %IDC_Left, HLeft - 2*M, VTop - yTool - 2*M

         'Right size/loc
         Control Set Loc  hDlg, %IDC_Right, HLeft + T + M, yTool + M
         Control Set Size hDlg, %IDC_Right, w - HLeft - 2*M - T, h - yTool - yStatus - 2*M

         'Bottom size/loc
         Control Set Loc  hDlg, %IDC_Bottom, M, VTop + T + M
         Control Set Size hDlg, %IDC_Bottom, HLeft - 2*M, h - VTop - yStatus - 2*M - T

      Case 3    'left beside right, bottom not visible
         'visibility
         Control Show State hDlg, %IDC_LabelH, %SW_Show
         Control Show State hDlg, %IDC_LabelV, %SW_Hide
         Control Show State hDlg, %IDC_Bottom, %SW_Hide

         'H splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelH, HLeft, yTool + M
         Control Set Size hDlg, %IDC_LabelH, T, h - yTool - yStatus - 2*M

         'V splitter bar loc/size
         '   none - not visible

         'Left loc/size
         Control Set Loc  hDlg, %IDC_Left, M, yTool + M
         Control Set Size hDlg, %IDC_Left, HLeft - 2*M, h - yTool - yStatus - 2*M

         'Right loc/size
         Control Set Loc  hDlg, %IDC_Right, HLeft + T + M, yTool + M
         Control Set Size hDlg, %IDC_Right, w - HLeft - 2*M - T, h - yTool - yStatus - 2*M

         'Bottom loc/size
         '   none - not visible

      Case 4    'left beside right, both below bottom
         'visibility
         Control Show State hDlg, %IDC_LabelH, %SW_Show
         Control Show State hDlg, %IDC_LabelV, %SW_Show
         Control Show State hDlg, %IDC_Bottom, %SW_Show

         'H splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelH, HLeft, VTop + T
         Control Set Size hDlg, %IDc_LabelH, T, h - VTop - yStatus - M - T

         'V splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelV, M, VTop
         Control Set Size hDlg, %IDC_LabelV, w - 2*M, T

         'Left loc/size
         Control Set Loc  hDlg, %IDC_Left, M, VTop + T + M
         Control Set Size hDlg, %IDC_Left, HLeft - 2*M, h - VTop - yStatus - 2*M - T

         'Right loc/size
         Control Set Loc  hDlg, %IDC_Right, HLeft + T + M, VTop + T + M
         Control Set Size hDlg, %IDC_Right, w - HLeft - 2*M - T, h - VTop - yStatus - 2*M - T

         'Bottom loc/size
         Control Set Loc  hDlg, %IDC_Bottom, M, yTool + M
         Control Set Size hDlg, %IDC_Bottom, w - 2*M, VTop - yTool - 2*M


      Case 5    'left top-to-bottom, right over bottom
         'visibility
         Control Show State hDlg, %IDC_LabelH, %SW_Show
         Control Show State hDlg, %IDC_LabelV, %SW_Show
         Control Show State hDlg, %IDC_Bottom, %SW_Show

         'H splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelH, HLeft, yTool + M
         Control Set Size hDlg, %IDC_LabelH, T, h - yTool - yStatus - 2*M

         'V splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelV, HLEFT + T, VTop
         Control Set Size hDlg, %IDC_LabelV, w - HLeft - T - M, T

         'Left loc/size
         Control Set Loc  hDlg, %IDC_Left, M, yTool + M
         Control Set Size hDlg, %IDC_Left, HLeft - 2*M, h - yTool - yStatus - 2*M

         'Right loc/size
         Control Set Loc  hDlg, %IDC_Right, HLeft + T + M, yTool + M
         Control Set Size hDlg, %IDC_Right, w - HLeft - T - 2*M, VTop - yTool - 2*M

         'Bottom loc/size
         Control Set Loc  hDlg, %IDC_Bottom, HLeft + T + M, VTop + T + M
         Control Set Size hDlg, %IDC_Bottom, w - HLeft - T - 2*M, h - VTop - yStatus - 2*M - T

      Case 6    'left over right, bottom not visible
         'visibility
         Control Show State hDlg, %IDC_LabelH, %SW_Hide
         Control Show State hDlg, %IDC_LabelV, %SW_Show
         Control Show State hDlg, %IDC_Bottom, %SW_Hide

         'H splitter bar loc/size
         '  none - not visible

         'V splitter bar loc/size
         Control Set Loc hDlg, %IDC_LabelV, M, VTop
         Control Set Size hDlg, %IDC_LabelV, w - 2*M, T

         'Left loc/size
         Control Set Loc  hDlg, %IDC_Left, M, yTool + M
         Control Set Size hDlg, %IDC_Left, w - 2*M, VTop - yTool - 2*M

         'Right loc/size
         Control Set Loc  hDlg, %IDC_Right, M, VTop + T + M
         Control Set Size hDlg, %IDC_Right, w - 2*M, h - VTop - yStatus - 2*M - T

         'Bottom loc/size
         '   none - not visible
   End Select
   StatusBar Set Parts hDlg, %IDC_StatusBar, w/3, w/3, w/3
   Dialog Redraw hDlg
End Sub
                 
'gbs_00392