PureBasic Forums - English

Posted: **Wed Jul 24, 2013 12:11 pm**

Is it possible to drag and drop a canvas gadget ??

I don't think it is but am more than happy to be proved wrong

Cheers

Posted: **Wed Jul 24, 2013 4:19 pm**

I use drag/drop on canvas gadgets a lot:

A little demo to show dragging text to a canvas gadget.

I hope I have read your request correctly.

Code: Select all

If OpenWindow(0, 100, 200, 195, 260, "PureBasic Window", #PB_Window_SystemMenu | #PB_Window_MinimizeGadget | #PB_Window_MaximizeGadget)
  
  CanvasGadget(0,10,10,100,100)
  EnableGadgetDrop(0,#PB_Drop_Text,#PB_Drag_Copy)
  
  Repeat
    Event = WaitWindowEvent()
   
    If Event =   #PB_Event_GadgetDrop
      Select EventGadget()
      Case 0
        Debug EventDropText()
      EndSelect
    EndIf
    If Event = #PB_Event_CloseWindow  ; If the user has pressed on the close button
      Quit = 1
    EndIf
    
  Until Quit = 1
  
EndIf

End

Posted: **Wed Jul 24, 2013 4:21 pm**

captain_skank wrote:Is it possible to drag and drop a canvas gadget ??

Hello captain_skank. I'm not absolutely sure what you mean by drag & drop a canvas gadget, but this example simulates a drag&drop functionality for a CanvasGadget():

Code: Select all

EnableExplicit
InitNetwork()

Enumeration
  #MainWindow
  #Canvas
  #Image
EndEnumeration

Define wFlags, appQuit, dragOn, canvasMouseXOffset, canvasMouseYOffset

If ReceiveHTTPFile("https://dl.dropboxusercontent.com/u/38177172/CS.bmp",
                    GetTemporaryDirectory() + "CS.bmp")
  LoadImage(#Image, GetTemporaryDirectory() + "CS.bmp")

  wFlags = #PB_Window_SystemMenu |#PB_Window_ScreenCentered
  OpenWindow(#MainWindow, #PB_Any, #PB_Any, 640, 480, "Drag&Drop CanvasGadget", wFlags)
  CanvasGadget(#Canvas, 10, 10, 200, 205, #PB_Canvas_Border)
  SetGadgetAttribute(#Canvas, #PB_Canvas_Image, ImageID(#Image))

  Repeat
    Select WaitWindowEvent()
      Case #PB_Event_CloseWindow
        appQuit = 1
      Case #PB_Event_Gadget
        Select EventGadget()
          Case #Canvas
            Select EventType()
              Case #PB_EventType_LeftButtonDown
                dragOn = 1
                canvasMouseXOffset = GetGadgetAttribute(#Canvas, #PB_Canvas_MouseX)
                canvasMouseYOffset = GetGadgetAttribute(#Canvas, #PB_Canvas_MouseY)
              Case #PB_EventType_LeftButtonUp
                dragOn = 0
              Case #PB_EventType_MouseMove
                If dragOn
                  ResizeGadget(#Canvas, WindowMouseX(#MainWindow) - canvasMouseXOffset, 
                               WindowMouseY(#MainWindow) - canvasMouseYOffset, #PB_Ignore, #PB_Ignore)
                EndIf
            EndSelect
        EndSelect
    EndSelect
  Until appQuit = 1
EndIf

Hope you like the image.

Posted: **Wed Jul 24, 2013 4:35 pm**

Hi TI-994A,

I thought my reply was a little naïve.

I think that your's is better.
A very nice demo by the way.

Also see: http://www.purebasic.fr/english/viewtop ... 13&t=54098

Posted: **Wed Jul 24, 2013 5:07 pm**

Hi davido, and thank you. A working example to someone who's not familiar with the functionality is never naive. I've always known it's there, but I've never had a chance to use PureBasic's Drag&Drop functions; very interesting. Thanks for the example, and the link too.

Posted: **Thu Jul 25, 2013 6:30 am**

Nice TI. Clever choice of image.

Posted: **Thu Jul 25, 2013 8:47 am**

Thanks guys - some nice code there.

It's not quite what I was after but has given me an idea how to acheive my end result - so thanks again.

cheers

Posted: **Sat Jul 27, 2013 10:50 pm**

Based on the assumption that what you want to do is drag the image from the canvas to somewhere else, could you see if this might serve:

Code: Select all

; drag the red box from the canvas to the imagegadget
CreateImage(0, 64,64,24, #Black)
CreateImage(1, 64,64,24, #Red)

OpenWindow(1, 0, 0, 300, 100, "Drag & Drop", #PB_Window_SystemMenu|#PB_Window_ScreenCentered)
CanvasGadget(0, 20,10,64,64)
SetGadgetAttribute(0, #PB_Canvas_Image, ImageID(1))
ImageGadget(1, 200, 10, 64, 64, ImageID(0))

EnableGadgetDrop(1, #PB_Drop_Image, #PB_Drag_Copy|#PB_Drag_Move)

Repeat
  Event = WaitWindowEvent()      
  If Event = #PB_Event_Gadget And EventGadget() = 0 And EventType() =  #PB_EventType_LeftButtonDown  
    DragImage(ImageID(1))
  EndIf      
  If Event = #PB_Event_GadgetDrop And EventGadget() = 1
    SetGadgetState(EventGadget(), EventDropImage(2))
  EndIf
Until Event = #PB_Event_CloseWindow

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Canvasgadget + drag n drop

Canvasgadget + drag n drop

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