ImGui new thread

keszegh · September 2021

strange thing:

i have the following window variant which snaps to grid points:

function ImGui:beginWindowSnapped(label,p_open,flags)
  local dragFlag = self:isMouseDragging(KeyCode.MOUSE_LEFT)
 
  if (not dragFlag) and self.snapX[label] then  
    self:setWindowPos(label,self.snapX[label], self.snapY[label]) end
    --self:setNextWindowPos(self.snapX[label], self.snapY[label])  end
 
    local r1,r2=self:beginWindow(label, p_open, flags )						
 
    if (dragFlag) then 
      local wx, wy = self:getWindowPos()
      self.snapX[label] = ((wx + _GRID_CELL/2 - _GRID_OFFSET_X) // _GRID_CELL) * _GRID_CELL + _GRID_OFFSET_X
      self.snapY[label] = ((wy + _GRID_CELL/2 - _GRID_OFFSET_Y) // _GRID_CELL) * _GRID_CELL + _GRID_OFFSET_Y
    end
    return r1,r2
  end

which sometimes crashes on the line
local r1,r2=self:beginWindow(label, p_open, flags )
with message
"attempt to call a nil value".

do you have any clue about the reason?

rrraptor · September 2021

@keszegh
Try the new version, maybe its fixed, but I think its something wrong with lua stack which can be affect by any function

keszegh · September 2021

rrraptor said:
@keszegh
Try the new version, maybe its fixed, but I think its something wrong with lua stack which can be affect by any function

thanks, i will test it, although it did not crash consistently so i cannot recreate the issue, just in long term we shall see.

btw @hgy29 may want to look into it if there is some general lua issue involved.

keszegh · September 2021

rrraptor said:
@keszegh
Try the new version, maybe its fixed, but I think its something wrong with lua stack which can be affect by any function

the issue happened actually even faster than before with the new version. btw i did not have such an issue until a day or two ago when i updated to the latest dll as of that time.

keszegh · September 2021

can a non-modal popup have a title bar?

keszegh · September 2021

i think i asked earlier but i still don't know if this is possible:
can one trigger a function when a popup is closed? (e.g. when the user clicks elsewhere)

keszegh · September 2021

is there any way to temporarily disable any interaction with the gui?

keszegh · September 2021

@rrraptor , now if i click on x of a window it does not close but it did before. i suspect it is due to a new dll as i don't remember changing things related to this.

i'm doing something like this:

if _layerWindowOpen then    
_layerWindowOpen=imgui:beginWindow("Layers", _layerWindowOpen,  ImGui.WindowFlags_NoNav|ImGui.WindowFlags_NoResize|ImGui.WindowFlags_NoScrollbar)
--...
imgui:endWindow()
end

EDIT: i checked and my code works fine (with this respect) with the imgui plugin bundled with latest gideros, and does not work with the dll you've sent.

keszegh · September 2021

is there a way to make the tick in a checkbox much smaller and add a thick inner boundary around it?

keszegh · September 2021

frameborder has some kind of antialiasing, see right widget on attached image when zoomed in a lot. can this be turned off so that boundary of widget is the same as for widget next to it that has no border.

also i cannot match the color, the color of the border is not exactly what i set with imgui:setStyleColor(ImGui.Col_Border,...)

keszegh · September 2021

my scaledimagebuttons etc. look as if not antialiased, can i do something to improve render quality?

keszegh · September 2021

keszegh said:

rrraptor said:
@keszegh
Try the new version, maybe its fixed, but I think its something wrong with lua stack which can be affect by any function
the issue happened actually even faster than before with the new version. btw i did not have such an issue until a day or two ago when i updated to the latest dll as of that time.

this issue makes my app completely unusable. is there at least some way i can prevent it from happening? that's a serious issue.

rrraptor · September 2021

@keszegh
So, I accidentally changed the order in which the variables are returned. Now everything is ok. Also added "StackChecker" in order to understand at what point a crash can occur. In DebugView it sould look like this:

Can you test new version?)

rrraptor · September 2021

keszegh said:
is there a way to make the tick in a checkbox much smaller and add a thick inner boundary around it?

Not possible.

rrraptor · September 2021

keszegh said:
is there any way to temporarily disable any interaction with the gui?

Theoretically, you can use new beginDisabled/endDisabled mechanism?

function onEnterFrame(e)
	ui:newFrame(e.deltaTime)
	if (UI_DISABLED) then
		ImGui:beginDisabled()
	end
	-- ui code
	if (UI_DISABLED) then
		ImGui:endDisabled()
	end
	ui:render()
	ui:endFrame()
end

rrraptor · September 2021

keszegh said:
frameborder has some kind of antialiasing, see right widget on attached image when zoomed in a lot. can this be turned off so that boundary of widget is the same as for widget next to it that has no border.

Perhabs you can do this:

local backupAAL = style:getAntiAliasedLines() -- terrable name btw
style:setAntiAliasedLines(false)
-- draw image with border
style:setAntiAliasedLines(backupAAL)

rrraptor · September 2021

keszegh said:
my scaledimagebuttons etc. look as if not antialiased, can i do something to improve render quality?

The image itself or what?

rrraptor · September 2021

Ok, now I think the problem with "attempt to call a nil value" is fixed. It was due to windows resize/input text callbacks.

keszegh · September 2021

rrraptor said:
Ok, now I think the problem with "attempt to call a nil value" is fixed. It was due to windows resize/input text callbacks.

thanks. did you update the beta dll too?
i will respond to the other stuff as well later.

keszegh · September 2021

setStyleColor seems to be missing from documentation.
btw, is there a setStyleVar function too?

keszegh · September 2021

turning off antialiased lines helps somewhat with the borders, but as you can see in attachment (right side) the corners are not correct.

on the other hand, on the same attachment you can also see how the icon is not antialiased and looks jittery (left side).

the crashing probably stopped, i need to test further but i hope so.

keszegh · September 2021

it is interesting that when i set antiAliasedLines(false) then the tick in the checkboxes started to look very similarly jittery as my images, so i guess for some reason no antialias is happening on my images (scaledImageButtons etc), even though i checked and the textures i use for them have filtering on.

keszegh · September 2021

i still did not find a way to set the window positions to some given place when a user wants to (i.e., clicks on a 'reset window positions' button) - note that this position may depend on the current screen size so they are not predefined constants.
do you have an idea how to achieve this?

keszegh · September 2021

@rrraptor ,i'm still struggling with resetting window positions.

i have the following line before my beginWindow:
imgui:setNextWindowPos(0, 20, ImGui.Cond_FirstUseEver)

one would think that when i want to reset the window then this would work (the name of the window is "Tools"):

gui.imgui:setWindowPos("Tools", 0, 225, ImGui.Cond_Always)

and it does work if i did not yet move the window manually since the app started. it even works multiple times (e.g. i set a button for positioning the window to the left of the screen and another to the right, then alternately pressing these buttons will move the window back and forth).
BUT if i move the window manually any time then positioning with setWindowPos won't work anymore.
so it seems to me that this is perhaps not an imgui specificity but perhaps a bug. at least what i'd expect seems quite logical to me, can you have a look?
ty

keszegh · October 2021

@rrraptor , i'd be grateful if you could give some help about this reset window position stuff.

rrraptor · October 2021

keszegh said:
@rrraptor , i'd be grateful if you could give some help about this reset window position stuff.

ui:setNextWindowPos(0, 20, ImGui.Cond_FirstUseEver)
ui:setNextWindowSize(64, 64, ImGui.Cond_FirstUseEver)
local window_name = "Hello world"
if (ui:beginWindow(window_name)) then 
	if (ui:button("Reset")) then 
		ui:setWindowPos(window_name, 0, 20)
		ui:setWindowSize(window_name, 64, 64)
	end
end
ui:endWindow()

https://github.com/MultiPain/Gideros_ImGui#windows-utilities

???

keszegh · October 2021

rrraptor said:
keszegh said:
@rrraptor , i'd be grateful if you could give some help about this reset window position stuff.
ui:setNextWindowPos(0, 20, ImGui.Cond_FirstUseEver)
ui:setNextWindowSize(64, 64, ImGui.Cond_FirstUseEver)
local window_name = "Hello world"
if (ui:beginWindow(window_name)) then 
	if (ui:button("Reset")) then 
		ui:setWindowPos(window_name, 0, 20)
		ui:setWindowSize(window_name, 64, 64)
	end
end
ui:endWindow()
https://github.com/MultiPain/Gideros_ImGui#windows-utilities

???

thanks,
actually the issue was that i was snapping windows to grid and once a window moved it was kept snapped. once i knew that your code should work, i did realize the problem, so even if i made the mistake, your help was needed.

now i only need a new gideros version so i can export to mac as well.

keszegh · October 2021

@rrraptor , finally gideros can register button click of wacom pens as a right-click ( @hgy29 sent me a custom dll that can do this). can you also make it that this is also registered by imgui as a right-click? (as it does not do this yet). thanks.

rrraptor · October 2021

keszegh said:
@rrraptor , finally gideros can register button click of wacom pens as a right-click ( @hgy29 sent me a custom dll that can do this). can you also make it that this is also registered by imgui as a right-click? (as it does not do this yet). thanks.

Ok

keszegh · October 2021

rrraptor said:

keszegh said:
@rrraptor , finally gideros can register button click of wacom pens as a right-click ( @hgy29 sent me a custom dll that can do this). can you also make it that this is also registered by imgui as a right-click? (as it does not do this yet). thanks.
Ok

thanks a lot.

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