Dear ImGui API

Dear ImGui LUA binding for Gideros Mobile

(copied from @rrraptor's GitHub https://github.com/MultiPain/Gideros_ImGui)

Constructor

-- font_atlas: copy fonts
-- mouse_listeners: adds internal mouse event listeners
-- keyboard_listeners: adds internal keyboard event listeners
-- touch_listeners: adds internal touch event listeners
ImGui.new([font_atlas = nil, mouse_listeners = true, keyboard_listeners = true, touch_listeners = false])

EXPERIMENTAL

p_open = ImGui:showLog(title, p_open [, ImGui.WindowFlags = 0]) -- draw log window
ImGui:writeLog(text)

Gestures (touch only, turned OFF by default) WIP:

• tap gesture (Left Mouse Button)
• hold gesture (Right Mouse Button)

ImGui:setTouchGesturesEnabled(bool)
bool = ImGui:isTouchGesturesEnabled()

FONTS

IO = imgui:getIO()
FontAtlas = IO:getFonts()

Font = FontAtlas:addFont(ttf_font_path, font_size [, options])

-- options (table): all parameters are optional
--	    fontDataOwnedByAtlas - bool
--	    pixelSnapH - bool
--	    mergeMode - bool
--	    fontNo - number
--	    oversampleH - number
--	    oversampleV - number
--	    glyphExtraSpacingX - number
--	    glyphExtraSpacingY - number
--	    glyphOffsetX - number
--	    glyphOffsetY - number
--	    glyphMinAdvanceX - number
--	    glyphMaxAdvanceX - number
--	    rasterizerFlags - number
--	    rasterizerMultiply - number
--	
--	    glyphs - table:
--		    text(string): represents available chars
--		    chars(table): list of specific char code (example: {0x7262, ...})
--		    ranges(table): predefined glyph ranges (example: {ImGui.GlyphRanges_Default, ImGui.GlyphRanges_Japanese, ...})
FontAtlas:addFonts(fontsDescription)
-- fontsDescriptions(table):
--      description(table):
--          ttf_font_path(string): path to a font
--          font_size(number): font size
--          options(table): see description above
-- example:
-- FontAtlas:addFonts{ {"fonts/DroidSans.ttf", 16}, {"fonts/ProggyTiny.ttf", 16} }

Font = FontAtlas:getFont([index]) -- get font by index (if index is 0 or nil you will get default font instance)
FontAtlas:build() -- call after multiple FontAtlas:addFont(...) calls to update ImGui font atlas 
FontAtlas:clearInputData()
FontAtlas:clearTexData()
FontAtlas:clearFonts()
FontAtlas:clear()
table = FontAtlas:getFonts() -- returns a table with all fonts (included default)
flag = FontAtlas:isBuilt()
number = FontAtlas:addCustomRectRegular(width, height)
number = FontAtlas:addCustomRectFontGlyph(font, id, width, height, advance_x [, offset_x, offset_y])
w, h, x, y, glyph_id, offset_x, offset_y, font, is_packed_flag = FontAtlas:getCustomRectByIndex(index)

ImGui:pushFont(font) -- font (table): object returned by FontAtlas:addFont(...) or FontAtlas:getFont([index])
ImGui:popFont()

Minimal example:

local UI = ImGui.new()
local IO = UI:getIO()
local FontAtlas = IO:getFonts()
local VDS_font = FontAtlas:addFont("fonts/VDS.ttf", 16, {
    oversampleH = 2,
    oversampleV = 2,
	glyphs = {
		ranges = {ImGui.GlyphRanges_Cyrillic}
	}
})
IO:setFontDefault(VDS_font)
FontAtlas:build()
stage:addChild(UI)

-- you can use multiple fonts at the same time
function enterFrame(e)
	UI:newFrame(e.deltaTime)
	
	UI:pushFont(font1)
	UI:text("Font1")
	UI:popFont()
	
	UI:pushFont(font2)
	UI:text("Font2")
	UI:popFont()
	
	UI:render()
	UI:endFrame()
end

Glyphs example:

local fonts = io:getFonts()
fonts:addFont(font_path, font_size, {
	glyphs = {
		ranges = {
			{
				0x2590,0x2593, -- range1
				0x2660,0x266B  -- range2
				-- ...
			},
			ImGui.GlyphRanges_Cyrillic,
			{
				0x01C0, 0x01C3 -- range3
			},
			ImGui.GlyphRanges_Korean
		},
 
		-- same structure:
		ranges = {
			{
				0x2590,0x2593, -- range1
				0x2660,0x266B, -- range2
				0x01C0,0x01C3  -- range3
				-- ...
			}, 
			ImGui.GlyphRanges_Cyrillic, 
			ImGui.GlyphRanges_Korean
		}
	},
	mergeMode = true, -- merge into previous font
})
fonts:build()

Icons example:

local icon = utf8.char(0x2590)
ImGui:text("My icon >>" .. icon .. " << !!!")

-- or with new Luau support:
ImGui:text("My icon >> \u{2590} << !!!")
-- can be also stored in memory:
local icon = "\u{2590}"

Font

number = Font:getSize()
FontAtlas = Font:getContainerAtlas()
Font:setScale(number)
number = Font:getScale()
number = Font:getAscent()
number = Font:getDescent()
boo = Font:isLoaded()
string = Font:getDebugName()
w, h = Font:calcTextSizeA(size, max_width, wrap_width, string)
Font:calcWordWrapPositionA(scale, string, wrap_width) -- not tested

INPUTS

ImGui:onMouseHover(event)
ImGui:onMouseMove(event)
ImGui:onMouseDown(event)
ImGui:onMouseUp(event)
ImGui:onMouseWheel(event)

ImGui:onTouchMove(event)
ImGui:onTouchBegin(event)
ImGui:onTouchEnd(event)
ImGui:onTouchCancel(event)

ImGui:onKeyUp(event)
ImGui:onKeyDown(event)
ImGui:onKeyChar(event)

Usage examples:

local UI = ImGui.new(nil, false, false, false)

Mouse

stage:addEventListener("mouseHover", function(e) UI:onMouseHover(e) end)
stage:addEventListener("mouseMove", function(e) UI:onMouseMove(e) end)
stage:addEventListener("mouseDown", function(e) UI:onMouseDown(e) end)
stage:addEventListener("mouseUp", function(e) UI:onMouseUp(e) end)
stage:addEventListener("mouseWheel", function(e) UI:onMouseWheel(e) end)

Touch

stage:addEventListener("touchesCancel", function(e) ui:onTouchCancel(e) end)
stage:addEventListener("touchesMove", function(e) ui:onTouchMove(e) end)
stage:addEventListener("touchesBegin", function(e) ui:onTouchBegin(e) end)
stage:addEventListener("touchesEnd", function(e) ui:onTouchEnd(e) end)

Keyboard

stage:addEventListener("keyUp", function(e) UI:onKeyUp(e) end)
stage:addEventListener("keyDown", function(e) UI:onKeyDown(e) end)
stage:addEventListener("keyChar", function(e) UI:onKeyChar(e) end)

Style setters/getters

Get style settings instance:

local Style = ImGui:getStyle()

Setters/getters:

Style:setColor(ImGui.Col, color, alpha)
color, alpha = Style:getColor(ImGui.Col)
Style:setAlpha(value)
value = Style:getAlpha()
Style:setWindowRounding(value)
value = Style:getWindowRounding()
Style:setWindowBorderSize(value)
value = Style:getWindowBorderSize()
Style:setChildRounding(value)
value = Style:getChildRounding()
Style:setChildBorderSize(value)
value = Style:getChildBorderSize()
Style:setPopupRounding(value)
value = Style:getPopupRounding()
Style:setPopupBorderSize(value)
value = Style:getPopupBorderSize()
Style:setFrameRounding(value)
value = Style:getFrameRounding()
Style:setFrameBorderSize(value)
value = Style:getFrameBorderSize()
Style:setIndentSpacing(value)
value = Style:getIndentSpacing()
Style:setColumnsMinSpacing(value)
value = Style:getColumnsMinSpacing()
Style:setScrollbarSize(value)
value = Style:getScrollbarSize()
Style:setScrollbarRounding(value)
value = Style:getScrollbarRounding()
Style:setGrabMinSize(value)
value = Style:getGrabMinSize()
Style:setGrabRounding(value)
value = Style:getGrabRounding()
Style:setLogSliderDeadzone(value)
value = Style:getLogSliderDeadzone()
Style:setTabRounding(value)
value = Style:getTabRounding()
Style:setTabBorderSize(value)
value = Style:getTabBorderSize()
Style:setTabMinWidthForCloseButton(value)
value = Style:getTabMinWidthForCloseButton()
Style:setMouseCursorScale(value)
value = Style:getMouseCursorScale()
Style:setCurveTessellationTol(value)
value = Style:getCurveTessellationTol()
Style:setCircleSegmentMaxError(value)
value = Style:getCircleSegmentMaxError()
Style:setWindowPadding(x, y)
x, y = Style:getWindowPadding()
Style:setWindowMinSize(x, y)
x, y = Style:getWindowMinSize()
Style:setWindowTitleAlign(x, y)
x, y = Style:getWindowTitleAlign()
Style:setFramePadding(x, y)
x, y = Style:getFramePadding()
Style:setCellPadding(x, y)
x, y = Style:getCellPadding()
Style:setItemSpacing(x, y)
x, y = Style:getItemSpacing()
Style:setItemInnerSpacing(x, y)
x, y = Style:getItemInnerSpacing()
Style:setTouchExtraPadding(x, y)
x, y = Style:getTouchExtraPadding()
Style:setButtonTextAlign(x, y)
x, y = Style:getButtonTextAlign()
Style:setSelectableTextAlign(x, y)
x, y = Style:getSelectableTextAlign()
Style:setDisplayWindowPadding(x, y)
x, y = Style:getDisplayWindowPadding()
Style:setDisplaySafeAreaPadding(x, y)
x, y = Style:getDisplaySafeAreaPadding()
Style:setWindowMenuButtonPosition(ImGui.Dir)
dir = Style:getWindowMenuButtonPosition()
Style:setColorButtonPosition(ImGui.Dir)
dir = Style:getColorButtonPosition()
Style:setAntiAliasedLines(flag)
flag = Style:getAntiAliasedLines()
Style:setAntiAliasedLinesUseTex(flag)
flag = Style:getAntiAliasedLinesUseTex()
Style:setAntiAliasedFill(flag)
flag = Style:getAntiAliasedFill()
Style:setDisabledAlpha(number)
alpha = Style:getDisabledAlpha()
Style:setSeparatorTextBorderSize(number)
number = Style:getSeparatorTextBorderSize()
Style:setSeparatorTextAlign(x, y)
x, y = Style:getSeparatorTextAlign()
Style:setSeparatorTextPadding(x, y)
x, y = Style:getSeparatorTextPadding()

DEFAULT STYLES

ImGui:setDarkStyle()
ImGui:setLightStyle()
ImGui:setClassicStyle()

Color convert

Note: use DOT instead of COLON, so you can use it without creating an ImGui object

r, g, b, a = ImGui.colorConvertHEXtoRGB(color [, alpha = 1])
hex = ImGui.colorConvertRGBtoHEX(r, g, b)
h, s, v = ImGui.colorConvertRGBtoHSV(r, g, b)
r, g, b = ImGui.colorConvertHSVtoRGB(h, s, v)
h, s, v = ImGui.colorConvertHEXtoHSV(hex)
hex = ImGui.colorConvertHSVtoHEX(h, s, v)

IO Functions

Get IO instance:

local IO = ImGui:getIO()

Functions:

IO:setFontDefault(font)
ImGuiConfigFlag = IO:getConfigFlags()
IO:setConfigFlags(ImGui.ConfigFlag)
IO:addConfigFlags(ImGui.ConfigFlag)
ImGuiBackendFlag = IO:getBackendFlags()
IO:setBackendFlags(ImGui.BackendFlag)
number = IO:getIniSavingRate()
IO:setIniSavingRate(number)
string = IO:getIniFilename()
IO:setIniFilename(string)
IO:saveIniSettings([path]) -- if path is not defined the it uses default path, which is set by IO:setIniFilename()
IO:loadIniSettings([path])
string = IO:getLogFilename()
IO:setLogFilename(string)
number = IO:getMouseDoubleClickTime()
IO:setMouseDoubleClickTime(number)
number = IO:getMouseDragThreshold()
IO:setMouseDragThreshold(number)
flag = IO:getMouseDrawCursor()
IO:setMouseDrawCursor(flag)
number = IO:getMouseDoubleClickMaxDist()
IO:setMouseDoubleClickMaxDist(number)
number = IO:getKeyRepeatDelay()
IO:setKeyRepeatDelay(number)
number = IO:getKeyRepeatRate()
IO:setKeyRepeatRate(number)
number = IO:getFontGlobalScale()
IO:setFontGlobalScale(number)
bool = IO:getFontAllowUserScaling()
IO:setFontAllowUserScaling(bool)
number, number = IO:getDisplayFramebufferScale()
IO:setDisplayFramebufferScale(number, number)
bool = IO:getConfigMacOSXBehaviors()
IO:setConfigMacOSXBehaviors(bool)
bool = IO:getConfigInputTextCursorBlink()
IO:setConfigInputTextCursorBlink(bool)
bool = IO:getConfigWindowsResizeFromEdges()
IO:setConfigWindowsResizeFromEdges(bool)
bool = IO:getConfigWindowsMoveFromTitleBarOnly()
IO:setConfigWindowsMoveFromTitleBarOnly(bool)
number = IO:getConfigWindowsMemoryCompactTimer()
IO:setConfigWindowsMemoryCompactTimer(number)
string = IO:getBackendPlatformName()
string = IO:getBackendRendererName()
bool = IO:IsMouseDown(button)
number = IO:getMouseWheel()
number = IO:getMouseWheelH()
flag = IO:wantCaptureMouse()
flag = IO:wantCaptureKeyboard()
flag = IO:wantTextInput()
flag = IO:wantSetMousePos()
flag = IO:wantSaveIniSettings()
number = IO:getFramerate()
number = IO:getMetricsRenderVertices()
number = IO:getMetricsRenderIndices()
number = IO:getMetricsRenderWindows()
number = IO:getMetricsActiveWindows()
number = IO:getMetricsActiveAllocations()
x, y = IO:getMouseDelta()
number = IO:getMouseDownSec(mouse_button)
IO:setDisplaySize(w, h)
w, h = IO:getDisplaySize()
number = IO:getDeltaTime()
-- reset mouse buttons state
IO:resetMouseDown()
-- reset key states (including ALT/SHIFT/CTRL/SUPER (META))
IO:resetKeysDown()
-- set ALT/SHIFT/CTRL/SUPER (META) key state
IO:setModKeyDown(key_code, bool) -- "key_code" is a gideros MOD key
-- set any key state
IO:setKeysDown(key_code, bool) -- "key_code" is a gideros regular "keyCode"
-- adds text to active text input widget
IO:addInputCharactersUTF8(text)
-- emulate wheel scrolling
IO:setMouseWheel(number)
-- sets mouse position (data only, no visual changes)
IO:setMousePos(x, y)
-- set mouse state, where index: 0 - left mouse, 1 - right, 2 - middle, 3 - unused, 4 - unused.
IO:setMouseDown(mouse_button, state) -- "mouse_button" is a gideros mouse button code

-- "key" is any ImGui KeyCode (check [here](#keyboard-keys))
-- "down" is a boolean
IO:addKeyEvent(key, down)
IO:addKeyAnalogEvent(key, down, number)
IO:AddMousePosEvent(x, y)
-- "button" is any ImGui button (check [here](#MouseButton))
IO:addMouseButtonEvent(button, down)
IO:addMouseWheelEvent(x, y)

IO:setAppAcceptingEvents([accepting_events = true])

Context

string OR nil = ImGui:getHoveredWindow()
string OR nil = ImGui:getHoveredWindowRoot()
string OR nil = ImGui:getHoveredWindowUnderMovingWindow()
string OR nil = ImGui:getMovingWindow()
string OR nil = ImGui:getActiveIdWindow()
id = ImGui:getActiveId()
id = ImGui:getActiveIdPreviousFrame()
number = ImGui:getActiveIdTimer()
id = ImGui:getActiveIdAllowOverlap()
id = ImGui:getHoveredId()
id = ImGui:getHoveredIdPreviousFrame()
number = ImGui:getHoveredIdTimer()
id = ImGui:getHoveredIdAllowOverlap()
bool = ImGui:getDragDropActive()
id = ImGui:getDragDropPayloadSourceId()
string = ImGui:getDragDropPayloadDataType()
number = ImGui:getDragDropPayloadDataSize()

WIDGETS & STUFF

Windows

p_open, draw = ImGui:beginWindow(label, p_open [, ImGui.WindowFlags = 0])
-- do not show "X" button
draw = ImGui:beginWindow(label, nil [, ImGui.WindowFlags = 0])
-- start a window with no borders, no paddings, no rounding and ImGui.WindowFlags_Fullscreen flag
p_open, draw = ImGui:beginFullScreenWindow(label, p_open [, ImGui.WindowFlags = 0]) 
-- do not show "X" button
draw = ImGui:beginFullScreenWindow(label, nil [, ImGui.WindowFlags = 0]) 
ImGui:endWindow()

Disabled groups

ImGui:beginDisabled(disabledFlag)
ImGui:endDisabled()

Child Windows

ImGui:beginChild(id [, w = 0, h = 0, borderFlag = false, ImGui.WindowFlags = 0])
ImGui:endChild()

Windows Utilities

flag = ImGui:isWindowAppearing()
flag = ImGui:isWindowCollapsed()
flag = ImGui:isWindowFocused([ImGui.FocusedFlags = 0])
flag = ImGui:isWindowHovered([ImGui.HoveredFlags = 0])
x, y = ImGui:getWindowPos()
w, h = ImGui:getWindowSize()
w = ImGui:getWindowWidth()
h = ImGui:getWindowHeight()

x1,y1, x2,y2 = ImGui:getWindowBounds() -- returns window region rectangle in global coordinates
ImGui:setNextWindowPos(x, y [, ImGui.Cond = 0, pivotX = 0, pivotY = 0])
ImGui:setNextWindowSize(w, h [, ImGui.Cond = 0])
ImGui:setNextWindowContentSize(w, h)
ImGui:setNextWindowCollapsed(flag [, ImGui.Cond = 0])
ImGui:setNextWindowFocus()
ImGui:setNextWindowBgAlpha(alpha)
ImGui:setNextWindowScroll(x, y)
ImGui:setWindowPos(name, x, y [, ImGui.Cond = 0]) OR ImGui:setWindowPos(x, y [, ImGui.Cond = 0])
ImGui:setWindowSize(name, w, h [, ImGui.Cond = 0]) OR ImGui:setWindowSize(w, h [, ImGui.Cond = 0])
ImGui:setWindowCollapsed(name, flag [, ImGui.Cond = 0]) OR ImGui:setWindowCollapsed(flag [, ImGui.Cond = 0])
ImGui:setWindowFocus(name) OR ImGui:setWindowFocus()
ImGui:setWindowFontScale(scale)
-- scroll window when touching void
ImGui:scrollWhenDragging(x, y)

Window size constraints

Can be used to set minimum and maximum window size, plus contraint the size if needed.

-- call this function before ImGui:beginWindow()
ImGui:setNextWindowSizeConstraints(min_w, min_h, max_w, max_h [, resize_callback, user_data]))
-- resizeCallback is a function:
function (callbackData [, user_data])
	-- do some math, and return desired size
	-- ...
	return desired_width, desired_height
end

Resize callback:

-- get window position
x, y = callbackData:getPos()
x = callbackData:getX()
y = callbackData:getY()

-- get currrent size
current_width, current_height = callbackData:getCurrentSize()
current_width = callbackData:getCurrentWidth()
current_height = callbackData:getCurrentHeight()

-- get desired size
deserid_width, deserid_height = callbackData:getDesiredSize()
deserid_width = callbackData:getDesiredWidth()
deserid_height = callbackData:getDesiredHeight()

Example:

require "ImGui"

local function stepSize(callback_data, step)
	local w, h = callback_data:getDesiredSize()
	w = (w // step) * step
	h = (h // step) * step
	return w, h
end

local ui = ImGui.new()
stage:addChild(ui)

stage:addEventListener("enterFrame", function(e)
	ui:newFrame(e.deltaTime)
	
	-- window size step is 32 (last argument, that is passed to the callback as second argument)
	ui:setNextWindowSizeConstraints(200, 200, 400, 400, stepSize, 32)
	if (ui:beginWindow("My window")) then 
		
		ui:textWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.")
	end
	ui:endWindow()
	
	ui:showDemoWindow()
	
	ui:render()
	ui:endFrame()
end)

Content region

scaleX, scaleY = ImGui:getContentRegionMax()
w, h = ImGui:getContentRegionAvail()
x, y = ImGui:getWindowContentRegionMin()
x, y = ImGui:getWindowContentRegionMax()

Windows Scrolling

x = ImGui:getScrollX()
y = ImGui:getScrollY()
maxX = ImGui:getScrollMaxX()
maxY = ImGui:getScrollMaxY()
ImGui:setScrollX(value)
ImGui:setScrollY(value)
ImGui:setScrollHereX([ratio = 0.5])
ImGui:setScrollHereY([ratio = 0.5])
ImGui:setScrollFromPosX(x [, ratio = 0.5])
ImGui:setScrollFromPosY(y [, ratio = 0.5])

Parameters stacks (shared)

ImGui:pushStyleColor(ImGui.Col, color, alpha)
ImGui:popStyleColor([count = 1])
ImGui:pushStyleVar(ImGui.StyleVar, value) OR ImGui:pushStyleVar(ImGui.StyleVar, value1, value2)
ImGui:popStyleVar([count = 1])
color, alpha = ImGui:getStyleColor(ImGui.Col)
fontSize = ImGui:getFontSize()

Parameters stacks (current window)

ImGui:pushItemWidth(w)
ImGui:popItemWidth()
ImGui:setNextItemWidth(w)
w = ImGui:calcItemWidth()
ImGui:pushTextWrapPos([localX = 0])
ImGui:popTextWrapPos()
ImGui:pushTabStop(flag)
ImGui:popTabStop()
ImGui:pushButtonRepeat(flag)
ImGui:popButtonRepeat()

Cursor / Layout

ImGui:separator()
ImGui:sameLine([offset_x = 0, spacing = -1])
ImGui:newLine()
ImGui:spacing()
ImGui:dummy(w, h)
ImGui:indent([indent = 0])
ImGui:unindent([indent = 0])
ImGui:beginGroup()
ImGui:endGroup()
 
x, y = ImGui:getCursorPos()
x = ImGui:getCursorPosX()
y = ImGui:getCursorPosY()
ImGui:setCursorPos(local_x, local_y)
ImGui:setCursorPosX(local_x)
ImGui:setCursorPosY(local_y)
x, y = ImGui:getCursorStartPos()
x, y = ImGui:getCursorScreenPos()
ImGui:setCursorScreenPos(x, y)
ImGui:alignTextToFramePadding()
lineH = ImGui:getTextLineHeight()
lineH = ImGui:getTextLineHeightWithSpacing()
frameH = ImGui:getFrameHeight()
frameH = ImGui:getFrameHeightWithSpacing()

ID stack/scopes

ImGui:pushID(anyValue) 
ImGui:pushID(str)
ImGui:popID()
number = ImGui:getID(any_value)
number = ImGui:getID(string)
number = ImGui:getItemID()

Widgets: Text

ImGui:textUnformatted(text [, textEnd])
ImGui:text(text)
ImGui:textColored(text, color, alpha)
ImGui:textDisabled(text)
ImGui:textWrapped(text)
ImGui:labelText(text, label)
ImGui:bulletText(text)
ImGui:separatorText(label)

Widgets: Main

flag = ImGui:button(text [, w = 0, h = 0])
flag = ImGui:smallButton(text)
flag = ImGui:invisibleButton(string_ID [, w = 0, h = 0])
flag = ImGui:arrowButton(string_ID [, ImGui.Dir = 0])
flag = ImGui:checkbox(text, flag)
flags, is_changed = ImGui:checkboxFlags(label [, flags = 0, flags_value = 0])
number, is_changed = ImGui:radioButton(text, number, number)
is_changed = ImGui:radioButton(text, flag)
ImGui:progressBar(fraction [, anchor_x = -1, anchor_y = 0, overlay_string = nil])
ImGui:bullet()

Widgets: Images

-- Images are streched (ImGui default functions)
ImGui:image(texture, w, h 
	[, tint_color = 0xffffff, tint_alpha = 1, 
	border_color = 0xffffff, border_alpha = 0])

ImGui:imageUV(texture, 
	w, h,
	uv0x, uv0y,
	uv1x, uv1y,
	[, tint_color = 0xffffff, tint_alpha = 1, border_color = 0xffffff, border_alpha = 0])

pressFlag = ImGui:imageButton(str_id, texture, w, h 
	[, tint_color = 0xffffff, tint_alpha = 1, 
	border_color = 0xffffff, border_alpha = 0])

pressFlag = ImGui:imageButtonUV(str_id, texture, w, h,
	uv0x, uv0y, uv1x, uv1y
	[, tint_color = 0xffffff, tint_alpha = 1, 
	border_color = 0xffffff, border_alpha = 0])

-- Images are scaled (extended by @MultiPain)
-- padding deprecated 
-- (use "ImGui:pushStyleVar(ImGui.StyleVar_FramePadding, x, y)/ImGui:popStyleVar()")
ImGui:scaledImage(str_id, texture, w, h 
	[, fit_mode = ImGui.ImageScaleMode_LetterBox, keep_size = false, 
	anchor_x = 0.5, anchor_y = 0.5, 
	tint_col = 0xffffff, tint_alpha = 1, 
	border_col = 0, border_alpha = 0, 
	bg_col = 0, bg_alpha = 0])
		  
pressFlag = ImGui:scaledImageButton(str_id, texture, w, h 
	[, fit_mode = ImGui.ImageScaleMode_LetterBox, keep_size = false, 
	ImGui.ButtonFlags = 0, anchor_x = 0.5, anchor_y = 0.5, 
	clip_offset_x = 0, clip_offset_y = 0,
	tint_col = 0xffffff, tint_alpha = 1, 
	border_col = 0, border_alpha = 0, 
	bg_col = 0, bg_alpha = 0])
					
pressFlag = ImGui:scaledImageButtonWithText(texture, label, image_w, image_h 
	[, button_w = 0, button_h = 0, ImGui.ButtonFlags = 0, 
	fit_mode = ImGui.ImageScaleMode_LetterBox, keep_size = false, 
	anchor_x = 0.5, anchor_y = 0.5, image_side = ImGui.Dir_Left, 
	clip_offset_x = 0, clip_offset_y = 0,
	tint_col = 0xffffff, tint_alpha = 1, 
	border_col = 0, border_alpha = 0, 
	bg_col = 0, bg_alpha = 0])

Widgets: Combo Box

openFlag = ImGui:beginCombo(text, preview_text [, ImGui.ComboFlags = 0])
ImGui:endCombo()
current_item, is_open = ImGui:combo(label, current_item, items) -- items (table): {"item1", "item2", ...}

Widgets: Drags

value, is_changed = ImGui:dragFloat(label, value 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, is_changed = ImGui:dragFloat2(label, value1, value2 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, value3, is_changed = ImGui:dragFloat3(label, value1, value2, value3 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, value3, value4, is_changed = ImGui:dragFloat4(label, value1, value2, value3, value4 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value_min, value_max, is_changed = ImGui:dragFloatRange2(label, value_min, value_max 
	[, inc_step = 1, min = 0, max = 0, 
	format_min_string = "%.3f", ImGui.SliderFlags = 0])
-- table must be an array of any size > 0
is_changed = ImGui:dragFloatT(label, table 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value, is_changed = ImGui:dragInt(label, value 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, is_changed = ImGui:dragInt2(label, value1, value2 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, value3, is_changed = ImGui:dragInt3(label, value1, value2, value3 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, value3, value4, is_changed = ImGui:dragInt4(label, value1, value2, value3, value4
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

v_current_min, v_current_max, flag = ImGui:dragIntRange2(label, v_current_min, v_current_max 
	[, v_speed = 1, v_min = 0, v_max = 0, 
	format = "%d", format_max = nil, ImGui.SliderFlags = 0])

-- table must be an array of any size > 0
is_changed = ImGui:dragIntT(label, table 
	[, inc_step = 1, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

Widgets: Sliders

value, is_changed = ImGui:sliderFloat(label, value 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, is_changed = ImGui:sliderFloat2(label, value1, value2 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, value3, is_changed = ImGui:sliderFloat3(label, value1, value2, value3 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, value3, value4, is_changed = ImGui:sliderFloat4(label, value1, value2, value3, value4 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value_in_rad, is_changed = ImGui:sliderAngle(label, value_in_rad 
	[, min_degrees = -360, max_degrees = 360, 
	format_string = "%.0f deg", ImGui.SliderFlags = 0])

-- table must be an array of any size > 0
is_changed = ImGui:sliderFloatT(label, table 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value, is_changed = ImGui:sliderInt(label, value 
	[, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, is_changed = ImGui:sliderInt2(label, value1, value2 
	[, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, value3, is_changed = ImGui:sliderInt3(label, value1, value2, value3
	[, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, value3, value4, is_changed = ImGui:sliderInt4(label, value1, value2, value3, value4
	[, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

-- table must be an array of any size > 0
is_changed = ImGui:sliderIntT(label, table 
	[, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value, is_changed = ImGui:vSliderFloat(label, w, h, value, min, max 
	[, format_string = "%.3f", ImGui.SliderFlags = 0])

value, is_changed = ImGui:vSliderInt(label, w, h, value, min, max 
	[, format_string = "%d", ImGui.SliderFlags = 0])

value, is_changed = ImGui:filledSliderFloat(label, mirror_flag, value 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, is_changed = ImGui:filledSliderFloat2(label, mirror_flag, value1, value2 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, value3, is_changed = ImGui:filledSliderFloat3(label, mirror_flag, value1, value2, value3 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value1, value2, value3, value4, is_changed = ImGui:filledSliderFloat4(label, mirror_flag, value1, value2, value3, value4 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

-- table must be an array of any size > 0
is_changed = ImGui:filledSliderFloatT(label, mirror_flag, table 
	[, min = 0, max = 0, 
	format_string = "%.3f", ImGui.SliderFlags = 0])

value_in_rad, is_changed = ImGui:filledSliderAngle(label, mirror_flag, value_in_rad 
	[, min_degrees = -360, max_degrees = 360,
	format_string = "%.0f deg", ImGui.SliderFlags = 0])

value, is_changed = ImGui:filledSliderInt(label, mirror_flag, value 
	[, min = 0, max = 0,
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, is_changed = ImGui:filledSliderInt2(label, mirror_flag, value1, value2 
	[, min = 0, max = 0,
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, value3, is_changed = ImGui:filledSliderInt3(label, mirror_flag, value1, value2, value3 
	[, min = 0, max = 0,
	format_string = "%d", ImGui.SliderFlags = 0])

value1, value2, value3, value4, is_changed = ImGui:filledSliderInt4(label, mirror_flag, value1, value2, value3, value4 
	[, min = 0, max = 0,
	format_string = "%d", ImGui.SliderFlags = 0])

-- table must be an array of any size > 0
is_changed = ImGui:filledSliderIntT(label, mirror_flag, table 
	[, min = 0, max = 0, 
	format_string = "%d", ImGui.SliderFlags = 0])

value, is_changed = ImGui:vFilledSliderFloat(label, mirror_flag, w, h, value, min, max 
	[, format_string = "%.3f", ImGui.SliderFlags = 0])

value, is_changed = ImGui:vFilledSliderInt(label, mirror_flag, w, h, value, min, max 
	[, format_string = "%d", ImGui.SliderFlags = 0])

Widgets: Input with Keyboard

text, flag = ImGui:inputText(label, text, buffer_size [, ImGui.InputTextFlags = 0])
text, flag = ImGui:inputTextMultiline(label, text, buffer_size [, w = 0, h = 0, ImGui.InputTextFlags = 0])
text, flag = ImGui:inputTextWithHint(label, text, hint, buffer_size [, ImGui.InputTextFlags = 0])
value,  flag = ImGui:inputFloat(label, value [, step = 0, step_fast = 0, format = "%.3f", ImGui.InputTextFlags = 0])
value1, value2, flag = ImGui:inputFloat2(label, value1, value2 [, format = "%.3f", ImGui.InputTextFlags = 0])
value1, value2, value3, flag = ImGui:inputFloat3(label, value1, value2, value3 [, format = "%.3f", ImGui.InputTextFlags = 0])
value1, value2, value3, value4, flag = ImGui:inputFloat4(label, value1, value2, value3, value4 [, format = "%.3f", ImGui.InputTextFlags = 0])
-- table must be an array of any size > 0
flag = ImGui:inputFloatT(label, table [, format = "%.3f", ImGui.InputTextFlags = 0])
value,  flag = ImGui:inputInt(label, value [, step = 0, step_fast = 0, ImGui.InputTextFlags = 0])
value1, value2, flag = ImGui:inputInt2(label, value1, value2 [, ImGui.InputTextFlags = 0])
value1, value2, value3, flag = ImGui:inputInt3(label, value1, value2, value3 [, ImGui.InputTextFlags = 0])
value1, value2, value3, value4, flag = ImGui:inputInt4(label, value1, value2, value3, value4 [, ImGui.InputTextFlags = 0])
-- table must be an array of any size > 0
flag = ImGui:inputIntT(label, table [, format = "%d", ImGui.InputTextFlags = 0])
value, flag = ImGui:inputDouble(label, value [, step = 0, step_fast = 0, format = "%.6f", ImGui.InputTextFlags = 0])

Input text callbacks:

ImGui:inputText(label, text, buffer_size [, ImGui.InputTextFlags = 0, callback_function, user_data])
ImGui:inputTextMultiline(label, text, buffer_size [, ImGui.InputTextFlags = 0, callback_function, user_data])
ImGui:inputTextWithHint(label, text, hint, buffer_size [, ImGui.InputTextFlags = 0, callback_function, user_data])

callback_function = function(callback_data, user_data)
	-- do something with data
	-- see below
end

callback_data:

ImGuiInputTextFlags = callback_data:getEventFlag()
ImGuiInputTextFlags = callback_data:getFlags()

number = callback_data:getEventChar()

callback_data:setEventChar(number)

keyCode = callback_data:getEventKey()

string = callback_data:getBuf()

callback_data:setBuf(string)

number = callback_data:getBufTextLen()

callback_data:setBufTextLen(number)

number = callback_data:getBufSize()

callback_data:setBufDirty(bool)
bool = callback_data:isBufDirty()

callback_data:setCursorPos(number)
number = callback_data:getCursorPos()

callback_data:setSelectionStart(s_start)
number = callback_data:getSelectionStart()

callback_data:setSelectionEnd(s_end)
s_end = callback_data:getSelectionEnd()

callback_data:setSelection(s_start, s_end)
s_start, s_end = callback_data:getSelection()

callback_data:selectAll()
callback_data:clearSelection()
bool = callback_data:hasSelection()

callback_data:deleteChars(position, bytesCount)
callback_data:insertChars(position, text)

Example:

require "ImGui"

ui = ImGui.new()
stage:addChild(ui)

local testMessage1 = ""
local testMessage2 = ""
local testMessage3 = ""

-- Add ".." at the end of current input string
function myCallback1(data)
	data:insertChars(data:getCursorPos(), "..")
end

-- Replace all chars if UP/DOWN arrow is pressed
function myCallback2(data)
	local key = data:getEventKey()
	if (key == key_code.UP) then
		data:deleteChars(0, data:getBufTextLen())
		data:insertChars(0, "Pressed Up!")
		data:selectAll()
	elseif (key == key_code.DOWN) then
		data:deleteChars(0, data:getBufTextLen())
		data:insertChars(0, "Pressed Down!")
		data:selectAll()
	end
end

-- Switch case of the first char
function myCallback3(data)
	local buf = data:getBuf()
	local s = buf:sub(1,1)
	if ((s >= 'a' and s <= 'z') or (s >= 'A' and s <= 'Z')) then 
		local first = string.char(string.byte(s) ~ 32)
		data:setBuf(first .. buf:sub(2))
		data:setBufDirty(true)
	end
end

function enterFrame(e)
	ui:newFrame(e.deltaTime)
	
	testMessage1 = ui:inputText(
		"Label1", 
		testMessage1, 
		64, 
		ImGui.InputTextFlags_CallbackCompletion, 
		myCallback1
	)
	testMessage2 = ui:inputText(
		"Label2", 
		testMessage2, 
		64, 
		ImGui.InputTextFlags_CallbackHistory, 
		myCallback2
	)
	testMessage3 = ui:inputText(
		"Label3", 
		testMessage3, 
		64, 
		ImGui.InputTextFlags_CallbackEdit, 
		myCallback3
	)
	
	ui:render()
	ui:endFrame()
end

stage:addEventListener("enterFrame", enterFrame)

Widgets: Color Editor/Picker

hexColor, is_touching = ImGui:colorEdit3(label, color [, ImGui.ColorEditFlags = 0]) -- alpha ignored, no need to pass it!
hexColor, alpha, is_touching = ImGui:colorEdit4(label, color [, alpha = 1, ImGui.ColorEditFlags = 0])
hexColor, is_touching = ImGui:colorPicker3(label, color [, ImGui.ColorEditFlags = 0])
hexColor, alpha, originalColor, originalAlpha, is_touching = ImGui:colorPicker4(label, color 
	[, alpha = 1, original_color = 0xffffff, original_alpha = 1, ImGui.ColorEditFlags = 0])
isHoveringFlag = ImGui:colorButton(string_ID, color [, alpha = 1, ImGui.ColorEditFlags = 0, w = 0, h = 0])
ImGui:setColorEditOptions(ImGui.ColorEditFlags)

Widgets: Trees

is_openFlag = ImGui:treeNode(label [, format_string])
ImGui:treeNodeEx(label, ImGui.TreeNodeFlags [, format_string])
ImGui:treePush(str_id)
ImGui:treePop()
number = ImGui:getTreeNodeToLabelSpacing()
is_openFlag, p_open = ImGui:collapsingHeader(label, p_open [, ImGui.TreeNodeFlags = 0])
is_openFlag = ImGui:collapsingHeader(label [, ImGui.TreeNodeFlags = 0])
ImGui:setNextItemOpen(is_open, ImGui.Cond)

Widgets: Selectables

result?, selected = ImGui:selectable(label, selected [, ImGui.SelectableFlags = 0, w = 0, h = 0])

Widgets: List Boxes

-- item_table: {"Item0", "Item1", ...}
current_item, is_openFlag = ImGui:listBox(label, current_item, item_table [, max_visible_items = -1])
result? = ImGui:listBoxHeader(label [, w = 0, h = 0])
result? = ImGui:listBoxHeader2(label, items_count)
ImGui:listBoxFooter()

Widgets: Data Plotting

Caching:

If you have big array of points it is better to cache it instead of translating lua table to C++ vector every time you call `ImGui:plotLines()`. But in this case you need to manage memory by yourself (free points pointer when you dont need it).

-- store points in memory
-- points_table: {0.01, 0.5, 10, -50, ...}
-- ptr: c++ pointer to a given vector
ptr = ImGui.cachePoints(points_table)

-- delete points from memory
ImGui.freePoints(ptr)

Plot functions:

-- len (number): points array lenght
ImGui:plotCachedLines(label, ptr, len, 
	[, values_offset = 0, overlay_text = nil, 
	scale_min = math.huge, scale_max = math.huge, 
	w = 0, h = 0])
	
ImGui:plotCachedHistogram(label, ptr, len, 
	[, values_offset = 0, overlay_text = nil, 
	scale_min = math.huge, scale_max = math.huge, 
	w = 0, h = 0])

ImGui:plotLines(label, points_table 
	[, values_offset = 0, overlay_text = nil, 
	scale_min = math.huge, scale_max = math.huge, 
	w = 0, h = 0])

ImGui:plotHistogram(label, points_table 
	[, values_offset = 0, overlay_text = nil, 
	scale_min = math.huge, scale_max = math.huge, 
	w = 0, h = 0])

Example:

-- delete ptr if it exist
function deletePtr()
	if pointsPtr then
		ImGui.freePoints(pointsPtr)
	end
end

function onEnterFrame()
	ui:newFrame(e.deltaTime)
	
	if ui:button("Generate") then
		deletePtr()
		points = generatePoints() -- returns big array
		pointsPtr = ImGui.cachePoints(points)
	end
	
	if pointsPtr then
		ui:plotCachedLines("Big data", pointsPtr, #points)
	end
	
	ui:render()
	ui:endFrame()
end

-- do not forget to clear memory when app is closing
function onAppExit()
	deletePtr()
end

Widgets: Value() Helpers

ImGui:value(prefix, bool)
ImGui:value(prefix, number)
ImGui:value(prefix, float, format_string)

Widgets: Menus

result? = ImGui:beginMenuBar()
ImGui:endMenuBar()
result? = ImGui:beginMainMenuBar()
ImGui:endMainMenuBar()
result = ImGui:beginMenu(label [, enabled = true])
result = ImGui:beginMenuEx(label, [icon = "", enabled = true])
ImGui:endMenu()
result = ImGui:menuItem(label [, shortcut = "", selected = false, enabled = true])
result = ImGui:menuItemEx(label, [icon = "", shortcut = "", selected = false, enabled = true])
ImGui:beginTooltip()
ImGui:endTooltip()
ImGui:setTooltip(text)

Popups, Modals

result? = ImGui:beginPopup(str_id [, ImGui.WindowFlags = 0])
p_open, result? = ImGui:beginPopupModal(str_id, p_open [, ImGui.WindowFlags = 0])
ImGui:endPopup()
ImGui:openPopup(str_id [, ImGui.PopupFlags = 0])
ImGui:openPopupOnItemClick(str_id [, ImGui.PopupFlags = 0])
ImGui:closeCurrentPopup()
result? = ImGui:beginPopupContextItem(str_id [, ImGui.PopupFlags = 0])
result? = ImGui:beginPopupContextWindow(str_id [, ImGui.PopupFlags = 0])
result? = ImGui:beginPopupContextVoid(str_id [, ImGui.PopupFlags = 0])
result? = ImGui:isPopupOpen(str_id [, ImGui.PopupFlags = 0])

Tables

flag = ImGui:beginTable(str_id, column [, ImGui.TableFlags = 0, outer_w = 0, outer_h = 0, inner_width = 0])
ImGui:endTable()
ImGui:tableNextRow([ImGui.TableRowFlags = 0, min_row_height = 0])
flag = ImGui:tableNextColumn()
flag = ImGui:tableSetColumnIndex(column_n)
ImGui:tableSetupColumn(label [, ImGui.TableColumnFlags = 0, init_width_or_weight = 0, user_id = 0])
ImGui:tableSetupScrollFreeze(cols, rows)
ImGui:tableHeadersRow()
TableSortSpecs = ImGui:tableGetSortSpecs() -- see below
number = ImGui:tableGetColumnCount()
number = ImGui:tableGetColumnIndex()
number = ImGui:tableGetRowIndex()
string = ImGui:tableGetColumnName([column_n = -1])
ImGuiTableColumnFlags = ImGui:tableGetColumnFlags([column_n = -1])
ImGui:tableSetBgColor(ImGui.TableBgTarget, color [, alpha = 1, column_n = -1])

Table sort specs

-- TableSortSpecs = ImGui:tableGetSortSpecs()
number = TableSortSpecs:getSpecsCount()
flag = TableSortSpecs:isSpecsDirty()
TableSortSpecs:setSpecsDirty(flag)
table = TableSortSpecs:getColumnSortSpecs() -- see below

Table column sort specs

-- table = TableSortSpecs:getColumnSortSpecs()
-- each value of this table is an object that have this functions:
number = item:getColumnUserID() 
number = item:getColumnIndex() -- 0 based
number = item:getSortOrder() -- used in multi sorted tables
number = item:getSortDirection() -- ImGui.SortDirection_Ascending OR ImGui.SortDirection_Descending

Example: https://github.com/MultiPain/Gideros_examples/blob/master/ImGuiTablesDemo/assets/TablesDemo.lua

Columns

ImGui:columns([count = 1, id = nil, border = true])
ImGui:nextColumn()
index = ImGui:getColumnIndex()
width = ImGui:getColumnWidth([column_index = -1])
ImGui:setColumnWidth(column_index, width)
offset = ImGui:getColumnOffset([column_index = -1])
ImGui:setColumnOffset(column_index, offset)
number = ImGui:getColumnsCount()

Tab Bars, Tabs

bool = ImGui:beginTabBar(str_id [, ImGui.TabBarFlags = 0])
ImGui:endTabBar()
p_open, bool = ImGui:beginTabItem(label, p_open [, ImGui.TabItemFlags = 0])
ImGui:endTabItem()
ImGui:setTabItemClosed(tab_or_docked_window_label)
ImGui:tabItemButton(label [, ImGui.TabItemFlags = 0])

Logging/Capture

ImGui:logToTTY(auto_open_depth = -1) 
ImGui:logToFile(auto_open_depth = -1, filename = nil) 
ImGui:logToClipboard(auto_open_depth = -1) 
ImGui:logFinish() 
ImGui:logButtons() 
ImGui:logText(text)

Drag and drop

flag = ImGui:beginDragDropSource([ImGui.DragDropFlags flags = 0])
flag = ImGui:setNumDragDropPayload(str_type, number [, ImGui.Cond cond = 0])
flag = ImGui:setStrDragDropPayload(str_type, string [, ImGui.Cond cond = 0])
ImGui:endDragDropSource()
flag = ImGui:beginDragDropTarget()
ImGuiPayload = ImGui:acceptDragDropPayload(type [, ImGui.DragDropFlags flags = 0])
ImGui:endDragDropTarget()
ImGuiPayload = ImGui:getDragDropPayload()

Payload:

number = ImGuiPayload:getNumData()
string = ImGuiPayload:getStrData()
ImGuiPayload:clear()
number = ImGuiPayload:getDataSize()
flag = ImGuiPayload:isDataType(type) -- type must be the same as in "ImGui:acceptDragDropPayload(type)"
flag = ImGuiPayload:isPreview()
flag = ImGuiPayload:isDelivery()

Usage example:

local names = {
	"Bobby", "Beatrice", "Betty",
	"Brianna", "Barry", "Bernard",
	"Bibi", "Blaine", "Bryn"
}
-- modes:
local Mode_Copy = 0
local Mode_Move = 1
local Mode_Swap = 2
 
local mode = 0 -- current mode

function onEnterFrame(e)
	UI:newFrame(e.deltaTime)
 
	if (UI:radioButton("Copy", mode == Mode_Copy)) then mode = Mode_Copy end UI:sameLine()
	if (UI:radioButton("Move", mode == Mode_Move)) then mode = Mode_Move end UI:sameLine()
	if (UI:radioButton("Swap", mode == Mode_Swap)) then mode = Mode_Swap end
 
	for i,v in ipairs(names) do
		UI:pushID(i)
		if (((i-1) % 3) ~= 0) then UI:sameLine() end
 
		UI:button(v, 60, 60)
 
		if (UI:beginDragDropSource(ImGui.DragDropFlags_None)) then
			--UI:setStrDragDropPayload("DND_DEMO_CELL", "ID_"..i) -- used for strings
			UI:setNumDragDropPayload("DND_DEMO_CELL", i) -- used for numbers
 
			if (mode == Mode_Copy) then UI:text(("Copy %s"):format(v)) end
			if (mode == Mode_Move) then UI:text(("Move %s"):format(v)) end
			if (mode == Mode_Swap) then UI:text(("Swap %s"):format(v)) end
			UI:endDragDropSource()
		end
 
		if (UI:beginDragDropTarget()) then
			local payload = UI:acceptDragDropPayload("DND_DEMO_CELL")
			if (payload) then
				--local payload_n = tonumber(payload:getStrData():sub(4))  -- if "setStrDragDropPayload" was used
				local payload_n = payload:getNumData() -- if "setNumDragDropPayload" was used
 
				if (mode == Mode_Copy) then
					names[i] = names[payload_n];
				end
				if (mode == Mode_Move) then
					names[i] = names[payload_n];
					names[payload_n] = "";
				end
 
				if (mode == Mode_Swap) then
					names[i], names[payload_n] = names[payload_n], names[i]
				end
			end
			UI:endDragDropTarget()
		end
		UI:popID()
	end
	UI:render()
	UI:endFrame()
end

stage:addEventListener("enterFrame", onEnterFrame)

Clipping

ImGui:pushClipRect(min_x, min_y, max_x, max_y, intersect_with_current_clip_rect)
ImGui:popClipRect()

ImGuiListClipper

Try to avoid creating new instances in "enterFrame" event.

Constructor:

instance = ImGuiListClipper.new()

Methods:

ImGuiListClipper:beginClip(number_of_items [, item_height = -1]) -- if item_height <= 0 then it is calculated automatically
ImGuiListClipper:endClip()
bool = ImGuiListClipper:step()
number = ImGuiListClipper:getDisplayStart()
number = ImGuiListClipper:getDisplayEnd()
number = ImGuiListClipper:getStartPosY()
number = ImGuiListClipper:getItemsCount()
ImGuiListClipper:forceDisplayRangeByIndices(number_min, number_max)

Usage example:

ui = ImGui.new()
stage:addChild(ui)

clipper = ImGuiListClipper.new()

function onEnterFrame(e)
	ui:newFrame(e.deltaTime)
	
	if (ui:beginWindow("Clipper demo")) then
		if (ui:beginTable("table", 3)) then
			ui:tableSetupScrollFreeze(0, 1)
			ui:tableSetupColumn("One")
			ui:tableSetupColumn("Two")
			ui:tableSetupColumn("Three")
			ui:tableHeadersRow()
			
			clipper:beginClip(1000)
			while (clipper:step()) do 
				for row = clipper:getDisplayStart(), clipper:getDisplayEnd() do 
					ui:tableNextRow()
					for column = 1, 3 do 
						ui:tableSetColumnIndex(column - 1)
						ui:text(("col: %d; row: %d"):format(column, row))
					end
				end
			end
			clipper:endClip()
			
			ui:endTable()
		end
	end
	ui:endWindow()
	
	ui:endFrame()
	ui:render()
end

stage:addEventListener("enterFrame", onEnterFrame)

ImGuiTextFilter

Try to avoid creating new instaces in "enterFrame" event.

Constructor:

filter = ImGuiTextFilter.new()

Methods:

-- draws the input field
isValueChanged = filter:draw(label [, width = 0])
-- draws the input field (using ImGui:inutTextWithHint())
isValueChanged = filter:drawWithHint(label, hint [, width = 0])

filter:setBuffer(text) -- set filter text
filter:build() -- update filter internals (see example below)
bool = filter:passFilter(text) -- returns true if filter input matches with "text"

Usage example 1:
https://github.com/MultiPain/Gideros_ImGui/blob/master/imgui_src/imgui_demo.cpp#L5657

ui = ImGui.new()
stage:addChild(ui)

filter = ImGuiTextFilter.new()
items = { "aaa1.c", "bbb1.c", "ccc1.c", "aaa2.cpp", "bbb2.cpp", "ccc2.cpp", "abc.h", "hello, world" }

function onEnterFrame(e)
	ui:newFrame(e.deltaTime)
	
	if (ui:beginWindow("Filter demo")) then
		ui:text(
[[Filter usage:
	""         display all lines
	"xxx"      display lines containing "xxx"
	"xxx,yyy"  display lines containing "xxx" or "yyy"
	"-xxx"     hide lines containing "xxx"]])
		
		filter:draw("Filter")
		
		for i, text in ipairs(items) do 
			if filter:passFilter(text) then 
				ui:bulletText(text)
			end
		end
	end
	ui:endWindow()
	
	ui:endFrame()
	ui:render()
end

stage:addEventListener("enterFrame", onEnterFrame)

Usage example 2:

ui = ImGui.new()
stage:addChild(ui)
filter = ImGuiTextFilter.new()

searchText = ""
items = { "aaa1.c", "bbb1.c", "ccc1.c", "aaa2.cpp", "bbb2.cpp", "ccc2.cpp", "abc.h", "hello, world" }
function onEnterFrame(e)
	ui:newFrame(e.deltaTime)
	
	-- Draw standart text input control
	-- filter:drawWithHint("Filter", "Search")
	
	-- Draw custom control
	local valueChanged = false
	searchText, valueChanged = ui:inputText("Filter", searchText, 256, ImGui.InputTextFlags_EnterReturnsTrue)
	if valueChanged then
		filter:setBuffer(searchText)
		-- try to avoid calling "build" function every frame
		filter:build()
	end
	
	for i, item in ipairs(items) do
		if not filter:passFilter(item) then
			continue
		end
		
		ui:bulletText(item)
	end
	
	ui:endFrame()
	ui:render()
end

Focus, Activation

ImGui:setItemDefaultFocus()
ImGui:setKeyboardFocusHere([offset = 0])
flag = ImGui:isItemHovered([ImGui.HoveredFlags = 0])
flag = ImGui:isItemActive()
flag = ImGui:isItemFocused()
flag = ImGui:isItemClicked(mouse_button)
flag = ImGui:isItemVisible()
flag = ImGui:isItemEdited()
flag = ImGui:isItemActivated()
flag = ImGui:isItemDeactivated()
flag = ImGui:isItemDeactivatedAfterEdit()
flag = ImGui:isItemToggledOpen()
flag = ImGui:isAnyItemHovered()
flag = ImGui:isAnyItemActive()
flag = ImGui:isAnyItemFocused()
minX, minY, maxX, maxY = ImGui:getItemRect()
x, y = ImGui:getItemRectMin()
x, y = ImGui:getItemRectMax()
w, h = ImGui:getItemRectSize()
ImGui:setItemAllowOverlap()

Miscellaneous Utilities

flag = ImGui:isRectVisible(w, h [, max_x, max_y])
number = ImGui:getTime()
number = ImGui:getFrameCount()
str = ImGui:getStyleColorName(idx)
flag = ImGui:beginChildFrame(id, w, h [, ImGui.WindowFlags = 0]) -- id (number)
ImGui:endChildFrame()

Text Utilities

w, h = ImGui:calcTextSize(text [, hide_text_after_double_hash = false, wrap_width = -1])

Inputs Utilities: Keyboard

string = ImGui:getKeyName(keyCode)
flag = ImGui:isKeyDown(keyCode)
flag = ImGui:isKeyPressed(keyCode [, repeat = true])
flag = ImGui:isKeyReleased(keyCode)
number = ImGui:getKeyPressedAmount(keyCode, repeat_delay, rate)
ImGui:setNextFrameWantCaptureKeyboard([want_capture_keyboard_value = true])

Shortcut system

-- (keyChord: an ImGuiKey optionally OR-ed with one or more ImGuiMod_XXX values (ImGuiKey | ImGuiMod_XXX))
ImGui:shortcut(keyChord [, owner_id = 0, ImGui.InputFlags = 0])

-- (useful to disable CTRL + TAB combo: ImGui:setShortcutRouting(ImGui.Mod_Ctrl | ImGui.Key_Tab, ImGui.KeyOwner_None))
ImGui:setShortcutRouting(keyChord [, owner_id = 0, ImGui.InputFlags = 0])

ImGui:setItemKeyOwner(keyCode [, ImGui.InputFlags = 0])

ImGui:setKeyOwner(keyCode, owner_id, [, ImGui.InputFlags = 0])

Inputs Utilities: Mouse

-- "mouse_button" is any gideros mouse button code
flag = ImGui:isMouseDown(mouse_button)
flag = ImGui:isMouseClicked(mouse_button [, repeat = false])
flag = ImGui:isMouseReleased(mouse_button)
flag = ImGui:isMouseDoubleClicked(mouse_button)
flag = ImGui:isMouseHoveringRect(min_x, min_y, max_x, max_y [, clip = true])
flag = ImGui:isMousePosValid([x = inf, y = inf])
flag = ImGui:isAnyMouseDown()
x, y = ImGui:getMousePos()
x, y = ImGui:getMousePosOnOpeningCurrentPopup()
flag = ImGui:isMouseDragging(mouse_button [, lock_threshold = -1])
x, y = ImGui:getMouseDragDelta(mouse_button [, lock_threshold = -1])
ImGui:resetMouseDragDelta(mouse_button)
ImGuiMouseCursor = ImGui:getMouseCursor()
ImGui:setMouseCursor(ImGui.MouseCursor)
ImGui:setNextFrameWantCaptureMouse([want_capture_mouse_value = true])
ImGui:setNextFrameWantCaptureKeyboard([want_capture_keyboard_value = true])
ImGui:updateCursor()

Render

ImGui:newFrame(deltaTime)
ImGui:render()
ImGui:endFrame()

Demos

is_openFlag = ImGui:showUserGuide()
is_openFlag = ImGui:showDemoWindow([p_open])
is_openFlag = ImGui:showAboutWindow([p_open])
is_openFlag = ImGui:showStyleEditor()
is_openFlag = ImGui:showFontSelector()
is_openFlag = ImGui:showMetricsWindow([p_open])
is_openFlag = ImGui:showStyleSelector(label)
is_openFlag = ImGui:ShowStackToolWindow([p_open])
ImGui:showLuaStyleEditor()

TextEditor

-- otherTextEditor: another "ImGuiTextEditor" instance to copy setting 
TextEditor = ImGuiTextEditor.new([other_text_editor])

Functions:

LanguageDefinition = TextEditor:getLanguageCPP()
LanguageDefinition = TextEditor:getLanguageGLSL()
LanguageDefinition = TextEditor:getLanguageHLSL()
LanguageDefinition = TextEditor:getLanguageC()
LanguageDefinition = TextEditor:getLanguageSQL()
LanguageDefinition = TextEditor:getLanguageAngelScript()
LanguageDefinition = TextEditor:getLanguageLua()

TextEditor:setLanguageDefinition(LanguageDefinition)
LanguageDefinition = TextEditor:getLanguageDefinition()

Palette = TextEditor:getPaletteDark()
Palette = TextEditor:getPaletteLight()
Palette = TextEditor:getPaletteRetro()

TextEditor:setPalette(Palette)
Palette = TextEditor:getPalette()

TextEditor:setPaletteColor(TE_ColorIndex, color [, alpha = 1]) -- see TextEditor enums below
color, alpha = TextEditor:getPaletteColor(TE_ColorIndex)

TextEditor:loadPalette(table) -- 42 elements table
-- example:
--[[ dark palete:
TextEditor:loadPalette{
	0x7f7f7f, 1,	-- Default
	0xd69c56, 1,	-- Keyword
	0x00ff00, 1,	-- Number
	0x7070e0, 1,	-- String
	0x70a0e0, 1,	-- Char literal
	0xffffff, 1,	-- Punctuation
	0x408080, 1,	-- Preprocessor
	0xaaaaaa, 1,	-- Identifier
	0x9bc64d, 1,	-- Known identifier
	0xc040a0, 1,	-- Preproc identifier
	0x206020, 1,	-- Comment (single line)
	0x406020, 1,	-- Comment (multi line)
	0x101010, 1,	-- Background
	0xe0e0e0, 1,	-- Cursor
	0xa06020, 0.5,	-- Selection
	0x0020ff, 0.5,	-- ErrorMarker
	0xf08000, 0.25, -- Breakpoint
	0x707000, 1,	-- Line number
	0x000000, 0.25, -- Current line fill
	0x808080, 0.25, -- Current line fill (inactive)
	0xa0a0a0, 0.25, -- Current line edge
}
]]

-- see below
TextEditor:setErrorMarkers(error_markers)
TextEditor:setBreakpoints(breakpoints)

TextEditor:render(string_id [, w = 0, h = 0, border = 0])

TextEditor:setText(string)
TextEditor:getText()
TextEditor:setTextLines(table) -- set editor text using table. Structure: {"line 1", "line 2", "line 3", ...}
table = TextEditor:getTextLines()

string = TextEditor:getSelectedText()
string = TextEditor:getCurrentLineText()

number = TextEditor:getTotalLines()
bool = TextEditor:isOverwrite()

bool = TextEditor:setReadOnly()
bool = TextEditor:isReadOnly()
bool = TextEditor:isTextChanged()
bool = TextEditor:isCursorPositionChanged()

TextEditor:setColorizerEnable()
bool = TextEditor:isColorizerEnabled()

line, column = TextEditor:getCursorPosition() -- 0 based line & column number 
TextEditor:setCursorPosition(line, column)

TextEditor:setHandleMouseInputs(bool)
bool = TextEditor:isHandleMouseInputsEnabled()

TextEditor:setHandleKeyboardInputs(bool)
bool = TextEditor:isHandleKeyboardInputsEnabled()

TextEditor:setTextEditorChildIgnored(bool)
bool = TextEditor:isTextEditorChildIgnored()

TextEditor:setShowWhitespaces(bool)
bool = TextEditor:isShowingWhitespaces()

TextEditor:setTabSize(size)
size = TextEditor:getTabSize()

TextEditor:insertText(string)

TextEditor:moveUp([amount = 1, select = false])
TextEditor:moveDown([amount = 1, select = false])
TextEditor:moveLeft([amount = 1, select = false])
TextEditor:moveRight([amount = 1, select = false])
TextEditor:moveTop([select = false])
TextEditor:moveBottom([select = false])
TextEditor:moveHome([select = false])
TextEditor:moveEnd([select = false])

TextEditor:setSelectionStart(line, column)
TextEditor:setSelectionEnd(line, column)
TextEditor:setSelection(start_line, start_column, end_line, end_column)
TextEditor:selectWordUnderCursor()
TextEditor:selectAll()
bool = TextEditor:hasSelection()

TextEditor:copy()
TextEditor:cut()
TextEditor:paste()
TextEditor:delete()

bool = TextEditor:canUndo()
bool = TextEditor:canRedo()
TextEditor:undo()
TextEditor:redo()

LanguageDefinition

string = LanguageDefinition:getName()

ErrorMarkers

ErrorMarkers = ImGuiErrorMarkers.new()

ErrorMarkers:add(line, message)
ErrorMarkers:remove(line)
message = ErrorMarkers:get(line)
number = ErrorMarkers:getSize()

Breakpoints

Breakpoints = ImGuiBreakpoints.new()

Breakpoints:add(line)
Breakpoints:remove(line)
bool = Breakpoints:get(line)
number = Breakpoints:getSize()

DRAW LISTS

Window draw list

local list = ImGui:getWindowDrawList()

Background draw list:

local list = ImGui:getBackgroundDrawList()

Foreground draw list:

local list = ImGui:getForegroundDrawList()

Draw lists commands:

DrawList:pushClipRect(clip_rect_min_x, clip_rect_min_y, clip_rect_max_x, clip_rect_max_y [, intersect_with_current_clip_rect = false])
DrawList:pushClipRectFullScreen()
DrawList:popClipRect()
DrawList:pushTextureID(texture)
DrawList:popTextureID()
x, y = DrawList:getClipRectMin()
x, y = DrawList:getClipRectMax()
DrawList:addLine(p1_x, p1_y, p2_x, p2_y, color [, alpha = 1, thickness = 1])
DrawList:addRect(
	p_min_x, p_min_y, 
	p_max_x, p_max_y, 
	color 
	[, alpha = 1, 
	rounding = 0, rounding_corners = ImGui.DrawFlags_RoundCornersAll, 
	thickness = 1])
DrawList:addRectFilled(p_min_x, p_min_y, p_max_x, p_max_y, color [, alpha = 1, rounding = 0, rounding_corners = ImGui.DrawFlags_RoundCornersAll])
DrawList:addRectFilledMultiColor(p_min_x, p_min_y, p_max_x, p_max_y, color_upr_left, color_upr_right, color_bot_right, color_bot_left)
DrawList:addQuad(p1_x, p1_y, p2_x, p2_y, p3_x, p3_y, p4_x, p4_y, color [, alpha = 1, thickness = 1])
DrawList:addQuadFilled(p1_x, p1_y, p2_x, p2_y, p3_x, p3_y, p4_x, p4_y, color)
DrawList:addTriangle(p1_x, p1_y, p2_x, p2_y, p3_x, p3_y, color [, alpha = 1, thickness = 1])
DrawList:addTriangleFilled(p1_x, p1_y, p2_x, p2_y, p3_x, p3_y, color)
DrawList:addCircle(center_x, center_y, radius, color [, alpha = 1, num_segments = 12, thickness = 1])
DrawList:addCircleFilled(center_x, center_y, radius, color [, alpha = 1, num_segments = 12])
DrawList:addNgon(center_x, center_y, radius, color [, alpha = 1, num_segments = 12, thickness = 1])
DrawList:addNgonFilled(center_x, center_y, radius, color [, alpha = 1, num_segments = 12])
DrawList:addText(x, y, color, alpha, text) -- x, y (number), text_begin (string), text_end (string)
DrawList:addFontText(font, font_size, 
	pos_x, pos_y, 
	color, alpha, 
	text 
	[, wrap_with = 0, 
	cpu_fine_clip_rect_x, cpu_fine_clip_rect_y, 
	cpu_fine_clip_rect_w, cpu_fine_clip_rect_h])
DrawList:addPolyline(points_table, color, alpha, closed, thickness) -- points_table (table), color (number), closed (bool), thickness (number)
DrawList:addConvexPolyFilled(points_table, color) -- points_table (table), color (number)
DrawList:addBezierCubic(
	p1_x, p1_y, 
	p2_x, p2_y, 
	p3_x, p3_y, 
	p4_x, p4_y, 
	color, alpha, thickness [, num_segments = 0])
DrawList:addBezierQuadratic(
	p1_x, p1_y, 
	p2_x, p2_y, 
	p3_x, p3_y, 
	color, alpha, thickness [, num_segments = 0])
DrawList:addImage(texture, 
	x, y, 
	x + w, y + h 
	[, tint_color = 0xffffff, tint_alpha = 1]) 
DrawList:addImageUV(texture, 
	x, y, 
	x + w, y + h, 
	uv0x, uv0y, 
	uv1x, uv1y 
	[, tint_color = 0xffffff, tint_alpha = 1]) 
DrawList:addImageQuad(texture, 
	x, y, 
	x + w, y, 
	x + w, y + h, 
	x, y + h 
	[, tint_color = 0xffffff, tint_alpha = 1, 
	uv0x = 0, uv0y = 0, 
	uv1x = 1, uv1y = 0, 
	uv2x = 1, uv2y = 1, 
	uv3x = 0, uv3y = 1])
DrawList:addImageRounded(texture, 
	x, y, 
	x + w, 
	y + h, 
	tint_color, tint_alpha, round_radius 
	[, corner_flags = ImGui.CorenerFlags_All])
DrawList:addImageRoundedUV(texture, 
	x, y, 
	x + w, y + h, 
	uv0x, uv0y, 
	uv1x, uv1y, 
	tint_color, tint_alpha, round_radius 
	[, corner_flags = ImGui.CorenerFlags_All])
DrawList:pathClear()
DrawList:pathLineTo(x, y)
DrawList:pathLineToMergeDuplicate(x, y)
DrawList:pathFillConvex(color)
DrawList:pathStroke(color, alpha, closed [, thickness = 1])
DrawList:pathArcTo(center_x, center_y, radius, a_min, a_max [, num_segments = 10])
DrawList:pathArcToFast(center_x, center_y, radius, a_min, a_max)
DrawList:pathBezierCubicCurveTo(p2x, p2y, p3x, p3y, p4x, p4y [, num_segments = 0])
DrawList:pathBezierQuadraticCurveTo(p2x, p2y, p3x, p3y [, num_segments = 0])
DrawList:pathRect(min_x, min_y, max_x, max_y [, rounding = 0, ImGui.DrawFlags = 0])
-- CUSTOM
-- rotate any draw list item around its center point
DrawList:rotateBegin()
DrawList:rotateEnd(radians)
-- example:
...
local list = ImGui:getWindowDrawList()
list:rotateBegin()
list:addLine(100, 100, 100, 250, 0xff0000, 1, 10)
list:rotateEnd(math.pi/2.2)
...

Usage example:

-- reference: https://github.com/ocornut/imgui/issues/3606#issuecomment-731726406
require "ImGui"
UI = ImGui.new()
IO = UI:getIO()
local w = 320
local h = 180
IO:setDisplaySize(w*2,h*2)

local cos,sin,sqrt=math.cos,math.sin,math.sqrt
local HSV2RGB=ImGui.colorConvertHSVtoRGB
local RGB2HEX=ImGui.colorConvertRGBtoHEX
local p = {-1,-1, 1,-1, 1,1, -1,1}
local function conv(z,szx,szy,ox,oy,vx,vy) return ((vx/z)*szx*5+szx*0.5)+ox,((vy/z)*szy*5+szy*0.5)+oy end
local function R(vx, vy, ng) ng*=0.1 local cosn = cos(ng) local sinn = sin(ng) return vx*cosn-vy*sinn, vx*sinn+vy*cosn end
local function FX(d,ax,ay,bx,by,sw,sh,t)
	d:addRectFilled(ax,ay,bx,by,0,1,0)
	t *= 4
	for i = 0, 19 do
		local z=21-i-(t-(t//1))*2
		local ng,ot0,ot1=-t*2.1+z,-t+z*0.2,-t+(z+1)*0.2
		local s,of,pts={cos((t+z)*0.1)*0.2+1,sin((t+z)*0.1)*0.2+1,cos((t+z+1)*0.1)*0.2+1,sin((t+z+1)*0.1)*0.2+1},{cos(ot0)*0.3,sin(ot0)*0.3,cos(ot1)*0.3,sin(ot1)*0.3},{}
		for j=0,7 do 
			local i,n = ((j%4)+1)*2,j//4 
			pts[j*2+1],pts[j*2+2]=conv((z+n)*2,sw,sh,ax,ay,R(p[i-1]*s[n*2+1]+of[n*2+1],p[i-0]*s[n*2+2]+of[n*2+2],ng+n)) 
		end
		for j=0,3 do 
			local it=((((i&1) ~= 0) and 0.5 or 0.6)+j*0.05)*((21-z)/21) 
			d:addConvexPolyFilled(
				{pts[j*2+1],pts[j*2+2],pts[((j+1)%4)*2+1],pts[((j+1)%4)*2+2],pts[(((j+1)%4)+4)*2+1],pts[(((j+1)%4)+4)*2+2],pts[(j+4)*2+1],pts[(j+4)*2+2]},
				RGB2HEX(HSV2RGB(0.6+sin(t*0.03)*0.5,1,sqrt(it)))
			)
		end
	end
end

function onEnterFrame(e)
	UI:newFrame(e.deltaTime)
	if (UI:beginWindow("FX", nil, ImGui.WindowFlags_AlwaysAutoResize)) then
	UI:invisibleButton("canvas", w, h)
	local min_x, min_y = UI:getItemRectMin()
	local max_x, max_y = UI:getItemRectMax()
	local draw_list = UI:getWindowDrawList()
	draw_list:pushClipRect(min_x, min_y, max_x, max_y)
	FX(draw_list,min_x,min_y,max_x,max_y,w,h,UI:getTime())
	draw_list:popClipRect()
	end
	UI:endWindow()
	UI:render()
	UI:endFrame()
end

stage:addChild(UI)
stage:addEventListener("enterFrame", onEnterFrame)

Dear ImGui

---

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