ImGui new thread

rrraptor · December 2021

@keszegh are you using font(s) with icons? There is something wrong with font loading, but no idea what because I dont know how I can debug this process...

@hgy29 is there a way to debug plugins?)

keszegh · December 2021

the whole code is this (and imgui plugin is added to plugin list):

require "ImGui_pre_build"
 
local ui = ImGui.new()--false,false, false, false) -- disable all events
--ui:setResetTouchPosOnEnd(true) -- if enabled resets touch pos to INF on "touchesEnd" event.
local IO = ui:getIO()
IO:setMouseDrawCursor(true, false) -- draw cursor, without hiding system cursor (second arg)
stage:addChild(ui)
 
stage:addEventListener("enterFrame", function(e)
	ui:newFrame(e.deltaTime)
 
	ui:showDemoWindow()
 
	ui:render()
	ui:endFrame()
end)
 
-- imgui_button_index: 0 to 4 (int)
-- state: bool
-- IO:setMouseDown(imgui_button_index, state)
-- IO:setMousePos(x, y)
-- IO:setMouseWheel(value)
 
stage:addEventListener("touchesBegin", function(e)
	local x, y = e.touch.x, e.touch.y
	IO:setMouseDown(0, true)
	IO:setMousePos(x, y)
end)
 
stage:addEventListener("touchesMove", function(e)
	local x, y = e.touch.x, e.touch.y
	IO:setMouseDown(0, true)
	IO:setMousePos(x, y)
end)
 
stage:addEventListener("touchesEnd", function(e)
	local x, y = e.touch.x, e.touch.y
	IO:setMouseDown(0, false)
	IO:setMousePos(x, y)
end)

keszegh · December 2021

it's the same if i change second line to local ui = ImGui.new(false,false, false, false)

rrraptor · December 2021

@keszegh added debug messages to DebugView, can you post its context here?

keszegh · December 2021

@rrraptor , i don't know what did you change, but in the new version the same code does not crash and mousePos seems to work. thanks, i can get ahead and try to use it to handle pen button as good as possible. i will let you know if i manage.

rrraptor · December 2021

keszegh said:
@rrraptor , i don't know what did you change, but in the new version the same code does not crash and mousePos seems to work. thanks, i can get ahead and try to use it to handle pen button as good as possible. i will let you know if i manage.

I installed latest version of gideros

hgy29 · December 2021

rrraptor said:

@hgy29 is there a way to debug plugins?)

Yes, you can do that in QtCreator, just open the plug-in project and the player project, compile everything in debug mode, put breakpoints and launch the player in debug run

keszegh · December 2021

EDIT: please disregard this comment, i've accidentally left another instance to refresh mousePos with wrong coordinates.

@rrraptor , i have some scaling issues with mousePos. my imgui is scaled with scale imgui_scaling (a constant) and is positioned at 0,0.

i add event listeners to stage.
this:

if event.type=="mouseHover" then                
        IO:setMousePos(event.x/imgui_scaling,event.y/imgui_scaling)
end

hovers the item under the mouse cursor, it is correct.
however

if event.type=="touchesBegin" then         
        IO:setMouseDown(0, true)         
        IO:setMousePos(event.touch.x/imgui_scaling,event.touch.y/imgui_scaling)
end

points to a different position, not where the cursor is. (And so clicks on a different item).
could you check if your code is correct or what am i doing wrong?
thanks

keszegh · December 2021

@rrraptor , is there a function to check if the current mouse position is over any part of the imgui? the use case is to decide if i should propagate the touch event to sprites below imgui or not.
(i don't need to know which item, only yes or no, but it should include menu's, windows, etc)
thanks

keszegh · December 2021

@rrraptor , probably i should use IO:wantCaptureMouse(), but it's value is not always correct when i use a pen:
at a touchesBegin i update mouse position with mousePos() and then i check IO:wantCaptureMouse() to see if it is hovering over a window (or used by some other way by imgui). works with mouse but with pen it gives the result 'false' even though i pressed the pen on a window.
how is this computed?

EDIT: note that hovering the pen does not send hover info to the gideros app (i wish it would).

keszegh · December 2021

to make it more concrete, when i have this code:

IO:setMousePos(xGui,yGui) 
IO:setMouseDown(0, true)   
guiHasMouse=IO:wantCaptureMouse()

then when i press the pen on top of a window, guiHasMouse is still false even though it should be true. a few calls later it becomes true but it is too late as already at that point assuming that imgui does not have the mouse, i used the pen info to start to draw beneath it (And then until pen is released, drawing gets a preference, i.e., imgui is ignored).

keszegh · December 2021

so the above issue persists but with some manual workarounds now i can manage to handle pen button quite close to what i wanted, so thanks for all your help @rrraptor and @hgy29.

keszegh · December 2021

how can i force a specific window to stay on top? (even if another window is in focus - note that this focused window should come in top of all the rest of the windows, except the special one).

rrraptor · December 2021

keszegh said:
how can i force a specific window to stay on top? (even if another window is in focus - note that this focused window should come in top of all the rest of the windows, except the special one).

There is no way.

keszegh · December 2021

rrraptor said:

keszegh said:
how can i force a specific window to stay on top? (even if another window is in focus - note that this focused window should come in top of all the rest of the windows, except the special one).
There is no way.

thanks, that's not so cool.

rrraptor · December 2021

I have small notification system:

1 main window is always behind notification windows, is that what you need?)

keszegh · December 2021

not exactly, as far as i understand. i have a horizontal menu spanning the bottom of the screen which i want to be always on top. see attached figure, the bottom menu should be over the rest of the windows.

keszegh · December 2021

it is not that crucial though, so i can live without it, but i thought it would make sense to make that bottom menu persistently on top.

rrraptor · December 2021

@keszegh bottom menu is a window with fixed position and size?

like:

ui:setNextWindowSize(...)
ui:setNextWindowPosition(...)
ui:beginWindow("##BottomMenu")
...
ui:endWindow()

keszegh · December 2021

yes

rrraptor · December 2021

Notifications:
https://github.com/MultiPain/ImGui-LUA-Notifications

rrraptor · December 2021

@keszegh I came up with this:

Atleast you can change focus when mouse is overlaping bottom window.

local BOTTOM_WINDOW_FLAGS	= 
	ImGui.WindowFlags_NoDecoration | 
	ImGui.WindowFlags_NoMove | 
	ImGui.WindowFlags_NoResize | 
	ImGui.WindowFlags_NoSavedSettings
local windowName = "##BottomMenu"
 
function onEnterFrame(e)
 
	ui:newFrame(e.deltaTime)
 
	local w, h = IO:getDisplaySize()
 
 
	ui:beginWindow("Window 1")
	ui:endWindow()
 
	ui:beginWindow("Window 2")
	ui:endWindow()
 
	ui:setNextWindowPos(0, h, ImGui.Cond_Always, 0, 1)
	ui:setNextWindowSize(w, 64)
	ui:beginWindow(windowName, nil, BOTTOM_WINDOW_FLAGS)
	for i = 1, 5 do 
		ui:button("Button "..i)
		ui:sameLine()
	end
	if (ui:isWindowHovered()) then 
		ui:setWindowFocus(windowName)
	end
	ui:endWindow()
 
	ui:render()
	ui:endFrame()
end

rrraptor · December 2021

keszegh said:
@rrraptor , is there a function to check if the current mouse position is over any part of the imgui? the use case is to decide if i should propagate the touch event to sprites below imgui or not.
(i don't need to know which item, only yes or no, but it should include menu's, windows, etc)
thanks

I guess you can try this:

ui:getHoveredWindow()

Returns window name if any hovered, nil otherwise

keszegh · December 2021

rrraptor said:
keszegh said:
@rrraptor , is there a function to check if the current mouse position is over any part of the imgui? the use case is to decide if i should propagate the touch event to sprites below imgui or not.
(i don't need to know which item, only yes or no, but it should include menu's, windows, etc)
thanks
I guess you can try this:
ui:getHoveredWindow()
Returns window name if any hovered, nil otherwise

thanks. there is also the top menu that should be included in the test.

keszegh · December 2021

rrraptor said:

@keszegh I came up with this:

Atleast you can change focus when mouse is overlaping bottom window.

local BOTTOM_WINDOW_FLAGS	= 
	ImGui.WindowFlags_NoDecoration | 
	ImGui.WindowFlags_NoMove | 
	ImGui.WindowFlags_NoResize | 
	ImGui.WindowFlags_NoSavedSettings
local windowName = "##BottomMenu"
 
function onEnterFrame(e)
 
	ui:newFrame(e.deltaTime)
 
	local w, h = IO:getDisplaySize()
 
 
	ui:beginWindow("Window 1")
	ui:endWindow()
 
	ui:beginWindow("Window 2")
	ui:endWindow()
 
	ui:setNextWindowPos(0, h, ImGui.Cond_Always, 0, 1)
	ui:setNextWindowSize(w, 64)
	ui:beginWindow(windowName, nil, BOTTOM_WINDOW_FLAGS)
	for i = 1, 5 do 
		ui:button("Button "..i)
		ui:sameLine()
	end
	if (ui:isWindowHovered()) then 
		ui:setWindowFocus(windowName)
	end
	ui:endWindow()
 
	ui:render()
	ui:endFrame()
end

thanks, that may be good too.
the imgui notification hyperlink you sent gives an error btw.

rrraptor · December 2021

keszegh said:
the imgui notification hyperlink you sent gives an error btw.

Oops, it was private

Fixed now

rrraptor · December 2021

keszegh said:
@rrraptor , probably i should use IO:wantCaptureMouse(), but it's value is not always correct when i use a pen:
at a touchesBegin i update mouse position with mousePos() and then i check IO:wantCaptureMouse() to see if it is hovering over a window (or used by some other way by imgui). works with mouse but with pen it gives the result 'false' even though i pressed the pen on a window.
how is this computed?

EDIT: note that hovering the pen does not send hover info to the gideros app (i wish it would).

In NewFrame():
https://github.com/MultiPain/Gideros_ImGui/blob/41173cca8ba5a91fa70cc6819d2af05db2b2bad9/imgui_src/imgui.cpp#L4104
Then:
https://github.com/MultiPain/Gideros_ImGui/blob/41173cca8ba5a91fa70cc6819d2af05db2b2bad9/imgui_src/imgui.cpp#L3920
And there is a function:
https://github.com/MultiPain/Gideros_ImGui/blob/41173cca8ba5a91fa70cc6819d2af05db2b2bad9/imgui_src/imgui.cpp#L4865
So, in theory you can call ImGui:captureMouseFromApp(true) after ImGui:newFrame() to fix this problem?

keszegh · December 2021

rrraptor said:

keszegh said:
@rrraptor , probably i should use IO:wantCaptureMouse(), but it's value is not always correct when i use a pen:
at a touchesBegin i update mouse position with mousePos() and then i check IO:wantCaptureMouse() to see if it is hovering over a window (or used by some other way by imgui). works with mouse but with pen it gives the result 'false' even though i pressed the pen on a window.
how is this computed?

EDIT: note that hovering the pen does not send hover info to the gideros app (i wish it would).
In NewFrame():
https://github.com/MultiPain/Gideros_ImGui/blob/41173cca8ba5a91fa70cc6819d2af05db2b2bad9/imgui_src/imgui.cpp#L4104
Then:
https://github.com/MultiPain/Gideros_ImGui/blob/41173cca8ba5a91fa70cc6819d2af05db2b2bad9/imgui_src/imgui.cpp#L3920
And there is a function:
https://github.com/MultiPain/Gideros_ImGui/blob/41173cca8ba5a91fa70cc6819d2af05db2b2bad9/imgui_src/imgui.cpp#L4865
So, in theory you can call ImGui:captureMouseFromApp(true) after ImGui:newFrame() to fix this problem?

if i set this, then it seems that IO:wantCaptureMouse() returns true irrespective of mouse/pen position (i.e., even if it is not over an imgui window)

rrraptor · December 2021

Ah, so captureMouseFromApp forces to set wantCaptureMouse to true no matter what. Otherwise it checks hovered window or any button that is pressed.

rrraptor · December 2021

Added another function:

ImGui:setMousePos(x, y)

Same as IO:setMousePos(x, y), but fixes scaling issues.

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