ImGui new thread

SinisterSoft · June 2021

I figured out the 1st bit - there is a flag.

newText,enterPressed=ui:inputText("##licence",text,80,ImGui.InputTextFlags_CharsUppercase|ImGui.InputTextFlags_CharsNoBlank|ImGui.InputTextFlags_EnterReturnsTrue)
		if newText~=text then

It changes the action of the second value to a true if enter is pressed rather than isChanged. To check if changed just compare the returned string with the old one.

keszegh · June 2021

@SinisterSoft , about enter key pressed this is how i open a context menu with an inputtext:

if (imgui:beginPopup("context menu")) then         
        if imgui:isWindowAppearing() then imgui:setKeyboardFocusHere() end        
        local text,flag=imgui:inputText("title", "xyz",32, ImGui.InputTextFlags_EnterReturnsTrue)        
        if flag then mytext=text imgui:closeCurrentPopup() end
        if imgui:isKeyPressed(27) or imgui:isKeyPressed(13)  then imgui:closeCurrentPopup() end			
        imgui:endPopup()
      end

keszegh · June 2021

you have found the same solution basically.
note that one can use isKeyPressed to close the popup when esc is pressed etc.

SinisterSoft · June 2021

@keszegh Do you know how to set the keyboard focus to a particular inputText ?

SinisterSoft · June 2021

@keszegh Also, do you have a more complete example of the context menu. I couldn't get that to work.

keszegh · June 2021

SinisterSoft said:
@keszegh Do you know how to set the keyboard focus to a particular inputText ?

imgui:setKeyboardFocusHere(offset)
should do the job with the right offset value, see:
https://github.com/ocornut/imgui/blob/master/imgui.h#L797

keszegh · June 2021

SinisterSoft said:
@keszegh Also, do you have a more complete example of the context menu. I couldn't get that to work.

if you mean a right-click context menu then i do it this way:

if imgui:button("mybutt",80) then end				     
      imgui:openPopupContextItem("popup", ImGui.PopupFlags_MouseButtonRight)      
      if (imgui:beginPopupContextItem("popup")) then
        result,selected=imgui:selectable("do this and that")                
        if selected then end
        imgui:endPopup()
      end

i've changed the names and left empty then end parts where you can trigger actions.
this works also for text etc instead of a button i think, just change the the first line accordingly.

keszegh · June 2021

my learning method with imgui is still a lot of trial and even more error so take my advices with this in mind, i wouldn't say i have a good overview of the api, i just do things one by one until they work as i want.

keszegh · June 2021

one thing about popups that e.g. it never worked directly from inside a menu for me. there is some trickery with stack if openPopup and beginPopup have the same id but it is still not working, in which case it's better to only set a value first and later at the right place (outside of menu building e.g.) check this value to openPopup and make the beginPopup right after, it's explained well here:
https://www.gitmemory.com/issue/ocornut/imgui/331/751372071

keszegh · June 2021

@rrraptor ,
see in the attached image the demo window is clipped for some reason. perhaps when resizing the window one has to reinitialize imgui rendering too?

rrraptor · June 2021

keszegh said:
so let me know how to do it, although i guess you've modified the source code to achieve that and so i need to wait for the next version.
it's fun that on the main imgui github page i'm still trying to explain what i want and try to be taken seriously while you've already done it. that's what i call gideros forum-style help. thanks

Yes, the source code is modified a bit

Added 3 lines and custom widget to display plain text in menu bar. Should I add this to the final build?

keszegh said:
@rrraptor ,
see in the attached image the demo window is clipped for some reason. perhaps when resizing the window one has to reinitialize imgui rendering too?

You need to change ImGui DisplaySize:

function TestScene:onAppResize()
	local minX, minY, maxX, maxY = application:getLogicalBounds()
	-- ignore scaling if needed
	local sx = application:getLogicalScaleX()
	local sy = application:getLogicalScaleY()
 
	self.imgui:setScale(1 / sx, 1 / sy)
	-- move UI to top left corner
	self.imgui:setPosition(minX, minY)
	-- resize display area
	local IO = self.imgui:getIO()
	IO:setDisplaySize((maxX - minX) * sx, (maxY - minY) * sy)
end

keszegh · June 2021

thanks, setDisplaySize was exactly what i needed.

for the menu+titlebar combo yes please add this to the final build. then i guess what i see on your gif is a menubar, and you used some additional trick to make it grabbable like a titlebar, so please share that code bit too at some point.

rrraptor · June 2021

I have created a small application for work that receives some information from our server. It works perfectly on my PC, but on other PCs I see "?" Instead of symbols and spaces.

And here some words have their first letters cut off, and the numbers in the calendar are missing.

@hgy29 any thoughts?
Neither my PC nor the PC on which the screenshots were taken has external GPU.

This is how is should look:

rrraptor · June 2021

keszegh said:
for the menu+titlebar combo yes please add this to the final build. then i guess what i see on your gif is a menubar, and you used some additional trick to make it grabbable like a titlebar, so please share that code bit too at some point.

Here is the line: https://github.com/ocornut/imgui/blob/2ab7f96f211bea8223bdd22ff100722d50cafa78/imgui.cpp#L3609
And here is my version:
https://github.com/MultiPain/Gideros_ImGui/blob/599edc5a86f03e474ba4e64938895fc085154849/imgui_src/imgui.cpp#L3609
All you have to do is to set "MoveFromTitleBarOnly" to true.

But for title text Im not sure... I made a separated widget that is basically "ImGui:menuItem()", but it does not work well...

rrraptor · June 2021

Just noticed this thing:

So I removed my own table of content.

rrraptor · June 2021

Added callbacks for InputText, syntax:

testMessage1 = ui:inputTextWithCllback(
	"Label1", 
	testMessage1, 
	64, 
	ImGui.InputTextFlags_CallbackCompletion, 
	myCallback1
)

Fixed callback for

ImGui:setNextWindowSizeConstraints()

rrraptor · June 2021

https://github.com/MultiPain/Gideros_ImGui#input-text-callbacks

keszegh · June 2021

@rrraptor , about the titlebar menubar combo ocornut also made an attempt:https://github.com/ocornut/imgui/issues/4258
which looks also good but due to hard to spot issues it is likely that it won't end up in a release version. nevertheless i'd be really happy to have this feature.

btw as an alternative, if i could set the width of the 'top' menu bar (MainMenuBar), i.e. so that it does not go all the way to the right, that would also give me a partial workaround for this issue. would that be simpler to do? i can see one solution to have two imgui items, one only for this mainmenubar clipped to the size i want, and another imgui item for all the rest of the windows. but perhaps there is a nicer solution.
being able to move around that mainmenubar as if it would be its own titlebar would also be good of course.

rrraptor · June 2021

Updated file dialog (WIP)

Autocompletion + select file with keyboard.

keszegh said:
@rrraptor , about the titlebar menubar combo ocornut also made an attempt:https://github.com/ocornut/imgui/issues/4258
which looks also good but due to hard to spot issues it is likely that it won't end up in a release version. nevertheless i'd be really happy to have this feature.

Looks cool

keszegh said:
btw as an alternative, if i could set the width of the 'top' menu bar (MainMenuBar), i.e. so that it does not go all the way to the right, that would also give me a partial workaround for this issue. would that be simpler to do?

I dont think that I can do it.

keszegh · June 2021

ImGui:openPopupOnItemClick
does not seem to exist contrary to the docs.
(it seems to me that ImGui:openPopupContextItem is obsolete and this is supposed to be its replacement)

rrraptor · June 2021

ImGui:openPopupContextItem

Was renamed to

ImGui:openPopupOnItemClick

in 1.79
So I decided to use old name in LUA for backward compatibility.

Fixed. Old function now throws an error

keszegh · June 2021

i hope i will remember this when i update to new version....

rrraptor · June 2021

keszegh said:
i hope i will remember this when i update to new version....

You dont have to

You will get an error, so you can quickly fix the problem.

rrraptor · June 2021

Another file dialog update

keszegh · June 2021

hi @rrraptor , i'm trying to do a confirm save dialog window, my issue is with setting keyboard focus.

this works fine:

if imgui:beginPopupModal("Save",nil,ImGui.WindowFlags_NoResize) then    
  if imgui:isWindowAppearing() then imgui:setKeyboardFocusHere() end
  local text,flag=imgui:inputText(".txt", "filename",32, ImGui.InputTextFlags_EnterReturnsTrue|ImGui.InputTextFlags_AutoSelectAll)

but if i want to put a text before the inputText then i cannot focus on the inputtext whatever i do. i tried to set imgui:setKeyboardFocusHere(2) and different values instead of 2, i also tried to set a flag on isWindowAppearing and then right before the inputtext i call setKeyboardFocusHere() if this flag is true, but none of these work as i want.

rrraptor · June 2021

@keszegh like that?

if (ui:beginPopupModal(title, true, 0)) then 
	ui:text("Hello world")
	local text,flag=ui:inputText(
		".txt", 
		"filename", 
		32, 
		ImGui.InputTextFlags_EnterReturnsTrue | 
		ImGui.InputTextFlags_AutoSelectAll
	)
	if (ui:isWindowAppearing()) then 
		ui:setKeyboardFocusHere() 
	end
	ui:button("Save")
	ui:endPopup()
end

keszegh · June 2021

the gif i do not see well, the code looks something like what i want to make work but for me it does not focus.
e.g. in your code ui:setKeyboardFocusHere() will focus on the next item, which is the Save button, am i right? at least according to the documentation. so how would it focus on the previous item?

keszegh · June 2021

interestingly it works after the second time i open the popup, so only the first time it does not focus on the inputtext.

keszegh · June 2021

@rrraptor, somehow miraculously it works now, all i changed was setting the width of the popup with
imgui:setNextWindowSize(200, 90, ImGui.Cond_Once)
i hope it stays working.
now i only need to find out the reason for the multiple backspaces in the inputtexts.

rrraptor · July 2021

@keszegh for some reason my code works... But I guess its because I call

ui:setNextWindowSize(800 >< w, 400 >< h, ImGui.Cond_Appearing)

before "beginPopupModal" too

Seems like a bug or something?

now i only need to find out the reason for the multiple backspaces in the inputtexts.

Have you tried to open compiled/not compiled (using Gideros itself) project on another PC? Or maybe different keyboard?

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