Drag&Drop

[zeoka]

Hi I try some things

takeSrc = function(component, mouseEvent)

SrcTrgX = mouseEvent:getMouseDownX ()
SrcTrgY = mouseEvent:getMouseDownY ()
--SrcTrgI = Image(RGB,64,16,true)  
--console(""..SrcTrgI:getFormat () )

   if SrcTrgX >= 0  and SrcTrgX <= 64 then
            for u = 0,13  
            do    
                if SrcTrgY >= u*16  and SrcTrgY <= (u*16) + 16 then
          -- SrcTrgG = Graphics(SrcTrgI)
          -- SrcTrgG:setColour(BLACK) 
          -- SrcTrgG:drawText(MdSrc1TABLEu+1TABLE,0,0,64,16,CENTRE,false) 
         end
  end

end
--SrcTrgI not valid 
details = DragAndDropSourceDetails("DragSrc&Trgt",component ,SrcTrgX,SrcTrgY  )

 return (details)

end

I encounter issue with probably image pixel format , another thing : DragAndDropSourceDetails wants x and y not Point() but it will returns a point ?

I see in the demo example you don’t use these values but put them in the description var().

how the target recognize the good source ?

RecSrc = function( component, dragSourceDetails)
if dragSourceDetails:getDescription() == "DragSrc&Trgt"
then
return (1)
else
return (0)
end
end

The description is ok but If i put statement in it then not

I can’t get localPosition I tried various things
and tried to do a function to get the data

test3 = function(component,dragSourceDetails)

function getPoint (name,component,x,y) 
    if x and y ~= nil then
  
  return x,y
     end

  end

--nameok = dragSourceDetails:getDescription()
getPoint(dragSourceDetails)

console(nameok)
console(""..x)
console(""..y)
if nameok == "DragSrc&Trgt"
then 
end 
end

But maybe dragSourceDetails return a point() or else ?
At least I get Image() oouff

[zeoka]

Ok I gave up LocalPosition and done like the example using only description

but can’t find anything when item is dropped to indicate the position of dropping…

I would drop in specific zones

I notice that for me shouldDrawDragImageWhenOver ( ) is false when the target isInterested and not on the example panel , I’m doing as the example panel thought
Surely because I don’t use (description,image,x,y) but (description,component,x,y)?
It’ temporary but I don’t know if Image() is registered in Ctrlr and if it needs
because I don’t get it

[dasfaker]

zeoka wrote:

but can’t find anything when item is dropped to indicate the position of dropping…

Do you mean the position where you release the mouse button? If that’s the case, I think it’s not possible, you only know the position when you start dragging. I gave up with drag & drop only for this reason.

Also this words from Jules:

The drag-and-drop classes are for picking something up, and dropping it onto a target, assuming that nothing of interest is going to happen in-between. I’d say that if you need to do anything even slightly complicated inside your itemDragMove, then you should probably do it some other way.

[zeoka]

Thx
yes I would have drop position

This is what I do to have drop values but this is failing
Description() is 100(the source type value because several lists obtained by loop&mouseEvent) + my value (here 0 to 13 ) so I do :

--
-- Called when the mouse moves over a component
--
FilterPos = function( comp,event)

FltX = event.x
FltY = event.y

end

--
-- Called when a DragAndDrop event occurs over this component
--

test = function(component,dragSourceDetails)

nameok = dragSourceDetails:getDescription()
--console(nameok)
       if FltX ~= nil 
      and FltY ~= nil
     then   --if nameok:byte(1) == 49 
                if FltX >=  64 and FltX <= 128  and FltY >= 80   and FltY <= 120 
              then FiltTrg = 0 
         --   elseif 
         --     then
         --   elseif 
         --     then      
         --   elseif 
         --     then
              else FiltTrg = nil
               end 
   component:repaint()
          --end    
      end

end

in my customcomponent paint scrip I added

g:setColour(BLACK:withAlpha(0.3 )) 
   if FiltTrg ~= nil 
 then if FiltTrg ==  0 
    then g:fillRoundedRectangle(64,80 ,64,40,2.0)
     end
  end

this add rectangle where the item can be dragged

--
-- Called when something is dropped on this component
--
test3 = function(component,dragSourceDetails)
console(string.format("Dropx:%d",FltX))
console(string.format("Dropy:%d",FltY))
console("DropXbrut:".. FltX)
console("DropYbrut:".. FltY)

console(dragSourceDetails:getDescription())  

end

my X and Y values are not realistics !!?? signed or not why ?

ex I drop near 128,40 and get :
Dropx:92
Dropy:11
DropXbrut:92
DropYbrut:11
103
or near 128,80 :
Dropx:234
Dropy:3
DropXbrut:234
DropYbrut:3
102

I have another issue with MyDescriprtionString:byte(1) method that returns nil
At least I get Image() it was (PixelFormat) an index

• This reply was modified 8 years, 12 months ago by zeoka.

[zeoka]

Hi Dasfaker

I quasi get it but with mouseDownCallback of the target custom comp :

mouseDown : select the target zone and give a variable and repaint
dragStart : take the info
IsInterested : it choses if return(1) or (0) with variable
Dropped : take the description string and get its value , set the buffer byte with value,
set the variable to nil and repaint

this is the last step that fails : tonumber(dragSourceDetails:getDescription())
returns nil I’ve read LUA and this is possible to put variable in it
the description is not a string , string.format doesn t change it

console(dragSourceDetails:getDescription()) it’s ok
I do tonumber(“110”) it’s ok
tonumber(dragSourceDetails:getDescription()) it’s nil

[zeoka]

console(dragSourceDetails:getDescription()) it’s ok
I do tonumber(“110″) it’s ok
tonumber(dragSourceDetails:getDescription()) it’s nil

My description is string number only

No idea ? Need to set a string parameter before convert to number ?

I want drag&drop to evitate to program many comboboxes in my customcomps

EDIT : just a thought , if we can create childs to the custom comp and there are on top we can finally drop in several zones ?
Dasfaker what do you think about that ?

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[dasfaker]

I have to look at the code I tried about drag&drop, I think I solved where the mouse was dropped without childs, but it was impossible to redraw the target component until the mouse was released, a feature I needed.

In fact, contrary to what I said before about not been able to know the drop point, it’s easy, just checking the mouse position on mouse up you get the drop point.

[zeoka]

I tried with mouse up too
we have to define target Point before dropping
Yes drag&drop override any target component mouse event

but I simply not get the description as value

how did you make ?

[dasfaker]

I didn’t used the description at all. In my case, I just had two custom components displaying a bank of patches, something like an excel table (with cells). I just clicked on a cell (a patch) and dragged to another cell in the same or the other custom component. I just needed two variables, one the cell clicked, the other the cell where I dropped. I mean, I used variables independent of the description stuff.

[zeoka]

thank you for your help
I will rethink my methods

[zeoka]

Hi

I try to do dragAndDrop with componentchild targets and IsInterested , Events independent of parent
and if see if that works

I’ve created valid components with some prop in beforeLoadingCallback and I get issue with addAndMakeVisible :

--
-- Called when the panel has finished loading
--
Loaded = function()

Mytext = ""
 for u = 1,6
   do 
       Mytext = Mytext.."ID".. CFlt?u?:getComponentID().."\n"
       
--     panel:getComponent("Filter"):addAndMakeVisible (CFlt?u?,-1)  -- Ambiguous 
--     GFlt?u?:drawText("coucou",0,10,64,20,CENTRE,false) 
--     CFlt?u?:paint(GFlt?u?)
 end

panel:getLabelComponent("TEXT"):setText(Mytext)  -- working

end

*table separator are represented with “?”
I haven’t set componentName not sure it is needed

Not sure if must type a stringComponentName or identifier (here a table name) in
addAndMakeVisible but this fails

“And for it to serve any useful purpose, you’ll need to write a subclass of Component or use one of the other types of component from the library. ”
What does it means ?

[zeoka]

Hi
I need some help !
I can’t get painting of my childs created, it lacks something , it is just a first test

--
-- Called when the panel has finished loading
--
Loaded = function()
Gsrc = Graphics(Image(2,64,40,true))
Gsrc:setColour(Colour(0xffffffff))
Gsrc:fillRect(0,0,64,40)
Gsrc:setColour(CL3[panel:getGlobalVariable(5)+1]) 

  for i = 1,6 
  do   l = {89,91,94,109,111,114}
       MyFilter:addChildAndSetID(Component("Flt"..i),""..l{i}) 
          --MyFilter:findChildWithID(""..l{I}):setAlwaysOnTop(true)
       MyFilter:findChildWithID(""..l{i}):setBounds (Sidx{l{i}}.x,Sidx{l{i}}.y,64,40)
       Gsrc:drawText(Sidx{l{i}}.n,0,10,64,20,CENTRE,false) 
       MyFilter:findChildWithID(""..l{I}):paintEntireComponent(Gsrc,true)
           --MyFilter:findChildWithID(""..l{I}): setBufferedToImage  (true ) 
  end

end

I see also in the lua editor “addMethod” there is Callbacks like componentLUAmouseup . are they callback I could use for my childs
and try to drop on them ?

[zeoka]

Hi

I get the Description userdata !

if u <= 15 then MyDetails = string.format("0%x",u) else MyDetails = string.format("%x",u) end details = DragAndDropSourceDetails(MyDetails ,SrcTrgI,0,0) the description here is a number ,generally useful for later , I pass it to hexstring and in isInterested callback : if SOURCE == 1 then local a = component:getOwner():getPropertyInt("modulatorCustomIndex") local b = dragSourceDetails:getDescription() local c = MemoryBlock(b) if c:getByte(0) <= Sidx[a].mx then panel:getComponent("drtext"):setText(""..c:getByte(0)) return (1) else return (0) end else return (0) end end I pass the description into a local memoryblock and get the byte as value I pass that to text to check the value

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