Hi all,
Is it possible to put some scroll bars on a Canvas / TBGL window (or do I have to create a separate form for it ?).
I need to look into a very wide BMP at pixel level (math related)
Thanks in advance ,
Rob
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Hi all,
Is it possible to put some scroll bars on a Canvas / TBGL window (or do I have to create a separate form for it ?).
I need to look into a very wide BMP at pixel level (math related)
Thanks in advance ,
Rob
Hi Rob,
the easiest way to achieve this is to use concept of viewports. You can nest dialog into dialog this way.
So you will have one main dialog, and one secondary, while the secondary will contain just the CANVAS/TBGL surface.
There are some examples in SampleScripts, but I crafted a simpler one here for you:
PetrCode:Uses "UI"
' -- ID numbers of controls
Begin ControlID
%Main_Viewport
End ControlID
Begin Const
%MAIN_WIDTH = 320
%MAIN_HEIGHT = 240
End Const
' -- Create dialog here
Function TBMain()
Local hDlg As DWord
Local hViewport As DWord
Dialog New Pixels, 0, "Minimalistic viewport demo",-1,-1, %MAIN_WIDTH, %MAIN_HEIGHT, _
%WS_POPUP Or %WS_VISIBLE Or %WS_CAPTION Or %WS_SYSMENU Or %WS_MINIMIZEBOX To hDlg
' -- Place controls here
hViewport = Control Add VIEWPORT, hDlg, %Main_Viewport, "", 10, 10, %MAIN_WIDTH-20, %MAIN_HEIGHT-20
Dialog_WithCanvas(hViewport)
Dialog Show Modal hDlg, Call cbDialog
End Function
' -- Callback for main dialog
CallBack Function cbDialog()
' -- Test for messages
Select Case CBMSG
Case %WM_INITDIALOG
' -- Put code to be executed after dialog creation here
Case %WM_COMMAND
' -- You can handle controls here
Case %WM_CLOSE
' -- Put code to be executed before dialog end here
End Select
End Function
Begin ControlID
%Viewport_Canvas
End ControlID
'----------------------------------------------------------------------------
Function Dialog_WithCanvas(hViewPort As DWord)
Local hDlg As Long
Dialog New Pixels, hViewPort, "", 0, 0, 500, 500, %WS_CHILD Or %WS_CLIPCHILDREN To hDlg
Control Add Canvas , hDlg, %Viewport_Canvas, "", 0, 0, 500, 500
Canvas_Attach(hDlg, %Viewport_Canvas, TRUE)
Canvas_Clear(%BLACK)
Canvas_Line((0,0), (500, 500), %GREEN)
Canvas_Line((500,0), (0, 500), %GREEN)
Canvas_Redraw
Dialog Show Modeless hDlg, Call cbCanvasDialog
ViewPort_SetChild(hViewPort, hDlg, FALSE )
Function = hDlg
End Function
' -- Callback for canvas dialog
CallBack Function cbCanvasDialog()
' -- Test for messages
Select Case CBMSG
Case %WM_INITDIALOG
' -- Put code to be executed after dialog creation here
Case %WM_COMMAND
' -- You can handle controls here
Case %WM_CLOSE
' -- Put code to be executed before dialog end here
End Select
End Function
Thanks alot , Petr .... perfect !