ImGui new thread

pie · March 2023

@MoKaLux thank you, this might be related, but I am not using Texture directly.
I guess that ImGui does something similar when it builds the FontAtlas, unfortunately I didn't see an exposed setting to extend its texture to a power of two (or to not do it)

keszegh · April 2023

it would be great to have freetype rendering option in gideros imgui, see
https://github.com/ocornut/imgui/tree/master/misc/freetype

keszegh · May 2023

better here:

@rrraptor why was the padding option removed from imageButton?

"Changed ImGui:imageButton(texture, w, h [, padding = -1, tint_color = 0xffffff, tint_alpha = 1, border_color = 0xffffff, border_alpha = 0]) to ImGui:imageButton(str_id, texture, w, h [, tint_color = 0xffffff, tint_alpha = 1, border_color = 0xffffff, border_alpha = 0])"

for all my imagebuttons padding was set to 0 but now it is impossible or much more complicated to set it with pushstyle before each of them (if that works, i did not check).

keszegh · May 2023

~~setting bg color does not work for me in imageButtonScaled, can you check it?~~
never mind, my args where on the wrong place.

rrraptor · May 2023

keszegh said:
better here:

@rrraptor why was the padding option removed from imageButton?

"Changed ImGui:imageButton(texture, w, h [, padding = -1, tint_color = 0xffffff, tint_alpha = 1, border_color = 0xffffff, border_alpha = 0]) to ImGui:imageButton(str_id, texture, w, h [, tint_color = 0xffffff, tint_alpha = 1, border_color = 0xffffff, border_alpha = 0])"

for all my imagebuttons padding was set to 0 but now it is impossible or much more complicated to set it with pushstyle before each of them (if that works, i did not check).

I have no idea, devs changed it in 1.89
https://github.com/ocornut/imgui/releases/tag/v1.89
Maybe I can bring it back...?

rrraptor · May 2023

keszegh said:
it would be great to have freetype rendering option in gideros imgui, see
https://github.com/ocornut/imgui/tree/master/misc/freetype

It cant be an option. Its either freetype or truetype.

keszegh · May 2023

rrraptor said:

I have no idea, devs changed it in 1.89
https://github.com/ocornut/imgui/releases/tag/v1.89
Maybe I can bring it back...?

i've replaced all occurrence with my padded variant of scaledimagebutton, yet it takes like 10 more arguments so much less clean (i could remove them from my variant though, as i anyway don't use them). all in all for me it does not matter much anymore.

keszegh · May 2023

rrraptor said:

show previous quotes
keszegh said:
it would be great to have freetype rendering option in gideros imgui, see
https://github.com/ocornut/imgui/tree/master/misc/freetype
It cant be an option. Its either freetype or truetype.

you mean it has to be set when gideros is built?

rrraptor · May 2023

keszegh said:

show previous quotes
rrraptor said:

keszegh said:
it would be great to have freetype rendering option in gideros imgui, see
https://github.com/ocornut/imgui/tree/master/misc/freetype
It cant be an option. Its either freetype or truetype.
you mean it has to be set when gideros is built?

Yes. Maybe we can have 2 versions of imgui and in plugin options (inside gideros) choose what you need. But I dont know how to implement this feature... @hgy29 can tell us

keszegh said:

show previous quotes
rrraptor said:

I have no idea, devs changed it in 1.89
https://github.com/ocornut/imgui/releases/tag/v1.89
Maybe I can bring it back...?
i've replaced all occurrence with my padded variant of scaledimagebutton, yet it takes like 10 more arguments so much less clean (i could remove them from my variant though, as i anyway don't use them). all in all for me it does not matter much anymore.

I am also thinking of changing custom "scaledImageButton" functions the same way. What do you think?)

keszegh · May 2023

what do you mean by same? can you share old syntax vs proposed syntax?

rrraptor · May 2023

keszegh said:
what do you mean by same? can you share old syntax vs proposed syntax?

Add str_id as first argument.
Before:

ImGui:scaledImage(texture, w, h ...)
ImGui:scaledImageButton(texture, w, h ...)

After:

ImGui:scaledImage(str_id, texture, w, h ...)
ImGui:scaledImageButton(str_id, texture, w, h ...)

keszegh · May 2023

ah yes, sure, that's useful, so far i needed to push/pop id's all the time.

pie · May 2023

@rrraptor is it possibile to wrap this workaround to scroll on touch in imgui gideros without breaking everything else? I think it is a nice feature for mobile, but I am not sure about its implications

https://github.com/ocornut/imgui/issues/3379

Thank you

rrraptor · May 2023

pie said:
@rrraptor is it possibile to wrap this workaround to scroll on touch in imgui gideros without breaking everything else? I think it is a nice feature for mobile, but I am not sure about its implications

https://github.com/ocornut/imgui/issues/3379

Thank you

Since its just a function, I can add this.
Edit:
Or you want to add this into "endWindow"/"endChild" functions?

pie · May 2023

Thank you, I have no preferences on that matter, I would stick to the easiest approach that makes it usable when needeed

keszegh · June 2023

@rrraptor ,probably for consistency ImGui:scaledImageButtonWithText should also be starting with an id, no?

rrraptor · June 2023

keszegh said:
@rrraptor ,probably for consistency ImGui:scaledImageButtonWithText should also be starting with an id, no?

Label is your ID, you can add anything after "##" and it wont be displayed. So you can do this:

for i = 1, 3 do
   ui:scaledImageButtonWithText(myTexture, `Name##{i}`, ...)
end

keszegh · June 2023

i see, won't it be more consistent in this case with the rest of the function syntaxes to exchange first two parameters?
(checkboxes are like that too i think, where their label is also shown and is the first parameter)

pie · July 2023

Hi @rrraptor I am trying ImGuiTextFilter for the first time, and I wonder how (if it's possible) to avoid fuzzy search and approach the filter as "beginning of word"+wildcard (or the word itself).
ie. search for "ti" should get: time, timing, timetable, titan, tito... but shouldn't get: monotime, pathetic, antithetic ... do I make sense?

thank you

rrraptor · July 2023

pie said:
Hi @rrraptor I am trying ImGuiTextFilter for the first time, and I wonder how (if it's possible) to avoid fuzzy search and approach the filter as "beginning of word"+wildcard (or the word itself).
ie. search for "ti" should get: time, timing, timetable, titan, tito... but shouldn't get: monotime, pathetic, antithetic ... do I make sense?
thank you

I dont think it is possible by default

pie · August 2023

rrraptor said:

show previous quotes
pie said:
@rrraptor is it possibile to wrap this workaround to scroll on touch in imgui gideros without breaking everything else? I think it is a nice feature for mobile, but I am not sure about its implications

https://github.com/ocornut/imgui/issues/3379

Thank you
Since its just a function, I can add this.
Edit:
Or you want to add this into "endWindow"/"endChild" functions?

I finally managed to try it and I have a question:
I am writing this inside a beginWindow, before EndWindow

local mouse_delta_x, mouse_delta_y = IO:getMouseDelta()
ui:scrollWhenDragging(0, -mouse_delta_y) --the first is 0 because I want only vertical scrolling

based on the documentation I should put only 2 parameters (x, y) but as soon as my app reach that point I get this error:

missing argument #4 to 'scrollWhenDragging' (number expected)
which number should I give it?
Thank you again @rrraptor

MoKaLux · August 2023

pie according to GH:
https://github.com/gideros/gideros/blob/6265acd33ab1163b13dbce06bed91bfa0b74904c/plugins/imgui/source/Common/imgui_user.h#L71

IMGUI_API void ScrollWhenDragging(float dx, float dy, ImGuiMouseButton mouse_button);

and
https://github.com/gideros/gideros/blob/6265acd33ab1163b13dbce06bed91bfa0b74904c/plugins/imgui/source/Common/imgui_user.cpp#L547

	void ScrollWhenDragging(float dx, float dy, ImGuiMouseButton mouse_button)

I don't know if mouse_button is optional or not, plus I don't know which value it should be

Sorry I cannot help further

pie · August 2023

@MoKaLux thank you might have helped:I tried hardcoding some mouse button values but without success so far

MoKaLux · August 2023

hope sir rrraptor will be around soon

rrraptor · August 2023

@pie

ui:beginChild('as') -- any begin state
for i = 1, 100 do 
	ui:text(`Item #{i}`)
end
-- 0: horizontal speed
-- -1: vertical speed (+1 to reverse scrolling)
-- 1: LMB (2 for RMB and I guess 4 for MMB, I dont have enums for these in ImGui for some reason...)
ui:scrollWhenDragging(0, -1, 1)
ui:endChild() -- any end state

pie · September 2023

rrraptor said:

@pie

ui:beginChild('as') -- any begin state
for i = 1, 100 do 
	ui:text(`Item #{i}`)
end
-- 0: horizontal speed
-- -1: vertical speed (+1 to reverse scrolling)
-- 1: LMB (2 for RMB and I guess 4 for MMB, I dont have enums for these in ImGui for some reason...)
ui:scrollWhenDragging(0, -1, 1)
ui:endChild() -- any end state

Thank you a lot @rrraptor !

While it works perfectly on pc I have a small issue on android, like as if it won't take the current screen offset, and reset the screen scroll-position on every new touch.

See this in action on android player: I've added a big scrollbar to see it better.

Thank you again!

EDIT: I guess this is the same issue: https://github.com/ocornut/imgui/issues/3379#issuecomment-879900513

application:setBackgroundColor(0x323232)
 
require "ImGui"
 
 
 
 
local ui = ImGui.new(nil, false, true, false) 
local IO = ui:getIO()
 
 
 
 
 
function onWindowResize(rt)
	local minX, minY, maxX, maxY = application:getLogicalBounds()
 
	local sx = application:getLogicalScaleX()
	local sy = application:getLogicalScaleY()
 
	ui:setScale(1 / sx, 1 / sy)
	-- move UI to top left corner
	ui:setPosition(minX, minY)
	-- resize display area
	IO:setDisplaySize((maxX - minX) * sx, (maxY - minY) * sy)
 
	if rt then
		rt = {
			x  = minX,
			X  = maxX,
			y  = minY,
			Y  = maxY,
			Sx = sx,
			Sy = sy,
			w  = (maxX - minX) * sx,
			h  = (maxY - minY) * sy
		}
		return rt
	end
end
 
ss = onWindowResize(true)
 
 
function DrawWindow(ui)
		ui:pushStyleVar(ImGui.StyleVar_ScrollbarSize, ss.w/10)
		ui:setNextWindowSize(ss.w, ss.h)
		ui:setNextWindowPos(ss.x, ss.y)
		local container = ui:beginWindow(
			"Window02", --title
			nil,  -- no close button
			ImGui.WindowFlags_NoCollapse | ImGui.WindowFlags_NoResize | ImGui.WindowFlags_NoBringToFrontOnFocus | ImGui.WindowFlags_NoMove |ImGui.WindowFlags_AlwaysVerticalScrollbar
			)
 
 
 
			for i = 1, 1000 do 
				ui:text(`Item #{i}`)
			end
			-- 0: horizontal speed
			-- -1: vertical speed (+1 to reverse scrolling)
			-- 1: LMB (2 for RMB and I guess 4 for MMB, I dont have enums for these in ImGui for some reason...)
			ui:scrollWhenDragging(0, -1, 1)
 
 
		ui:endWindow()
		ui:popStyleVar()
 
end
 
local function onDrawGui(e)
	ui:newFrame(e.deltaTime)
 
	DrawWindow(ui)
 
	print("test")
	ui:updateCursor()
	ui:render()
	ui:endFrame()
end
 
 
onWindowResize()
 
 
 
 
function onTouch(event)               
  local IO=IO    
	if event.type=="mouseWheel" then      
    IO:setMouseWheel(event.wheel/300)
    IO:setMousePos(event.x,event.y)            
    return    
  end
  if event.type=="mouseHover" then      
    IO:setMousePos(event.x,event.y)        
    return    
  end
  local xGui=event.touch.x
  local yGui=event.touch.y
  IO:setMousePos(xGui,yGui) 
  guiHasMouse=IO:wantCaptureMouse()   
if event.type=="touchesBegin" then           
	if event.touch.mouseButton==0 then event.touch.mouseButton=1 end	 --workaround
    IO:setMouseDown(event.touch.mouseButton, true)                       
  end
  if event.type=="touchesMove" then           
  end
  if event.type=="touchesEnd" then        
	  if event.touch.mouseButton==0 then event.touch.mouseButton=1 end     --workaround
    IO:setMouseDown(event.touch.mouseButton, false)           
    IO:setMouseDown(2, false)  --for safety, sometimes right-click got `stuck' 
  end     
 
  guiHasMouse=IO:wantCaptureMouse()  
  if guiHasMouse then return end
 end
 
stage:addEventListener(Event.TOUCHES_BEGIN, onTouch,self)
stage:addEventListener(Event.TOUCHES_MOVE, onTouch,self)  
stage:addEventListener(Event.TOUCHES_END, onTouch,self)
stage:addEventListener(Event.TOUCHES_CANCEL, onTouch,self)
stage:addEventListener(Event.MOUSE_HOVER, onTouch,self)
stage:addEventListener(Event.MOUSE_WHEEL, onTouch,self)
 
 
stage:addEventListener("enterFrame", onDrawGui)
stage:addEventListener("applicationResize", onWindowResize)
 
 
stage:addChild(ui)

keszegh · February 2024

dear all,
using imgui i want to send a table as a payload on drag'n'drop. is that possible? as far as i see one can send a single number or a string (am i right? can we send multiple values for example?), so some lua way to convert a table to a number and back would also be fine.

rrraptor · February 2024

keszegh said:
dear all,
using imgui i want to send a table as a payload on drag'n'drop. is that possible? as far as i see one can send a single number or a string (am i right? can we send multiple values for example?), so some lua way to convert a table to a number and back would also be fine.

I tried to make it accept any data, but no luck. It is possible, I just dont know how to do it from C++ side...

keszegh · February 2024

@rrraptor , thanks, at the end i've rewritten my code so that the relevant tables can be referred to by an id as well and then i'm sending the id only and looking up the respective table by its id when needed.

but overall it is strange that one can only send one number or string, even if sending tables is obviously only a lua specific possibility, so it is not that surprising that imgui does not handle it by default.

gideros+imgui is still amazing. i just spent 2 days on doing drag'n'drop reordering of lists and at the end i gave up on putting something 'between' to other things, as apparently imgui can do that only in a messy way. but still i'm happy with how i managed to do it.

keszegh · July 2024

dear all,
do you know a way to have the ability for a slider (dragInt) to have exact input option on ctrl+click but not on double-click? thanks

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