Sprite:setLayoutConstraints

Available since: Gideros 2018.9
Class: Sprite

Description

Gideros layout system is heavily based on Java GridBagLayout principle. See here for more explanation https://www.math.uni-hamburg.de/doc/java/tutorial/uiswing/layout/gridbag.html

This function specifies the child placement rules within the grid defined on its parent by Sprite:setLayoutParameters.

Sprite:setLayoutConstraints(constraints)

Specifying a nil table will clear layout constraints.

When a Sprite is resized by the layout system, an Event.LAYOUT_RESIZED is triggered

TODO: add/reorder/document missing fields from

• https://github.com/gideros/gideros/blob/e75e76c2857f8d8892c2383cea97fff174ff9a96/2dsg/gridbaglayout.h#L220
• https://github.com/gideros/gideros/blob/e75e76c2857f8d8892c2383cea97fff174ff9a96/luabinding/spritebinder.cpp#L786
• ...

The constraint table can contain the following fields:

• gridx: the 0-based index of the column the child must be placed into
• gridy: the 0-based index of the row the child must be placed into
• gridwidth: the number of column this child will take
• gridheight: the number of row this child will take
• weightx: the horizontal weight of the child. Used to distribute extra space among children
• weighty: the vertical weight of the child. Used to distribute extra space among children
• anchor: defines where the child should be placed inside its grid space. Can be: Sprite.LAYOUT_ANCHOR_NORTHWEST, Sprite.LAYOUT_ANCHOR_NORTH, Sprite.LAYOUT_ANCHOR_NORTHEAST, Sprite.LAYOUT_ANCHOR_WEST, Sprite.LAYOUT_ANCHOR_CENTER, Sprite.LAYOUT_ANCHOR_EAST, Sprite.LAYOUT_ANCHOR_SOUTHWEST, Sprite.LAYOUT_ANCHOR_SOUTH or Sprite.LAYOUT_ANCHOR_SOUTHEAST
• anchorx: specifies relative placement of the child on X axis. anchor mustn't be set since 2020.7
• anchory: specifies relative placement of the child on Y axis. anchor mustn't be set since 2020.7
• fill: in which directions the child should be expanded to fit the grid space. Can be: Sprite.LAYOUT_FILL_NONE, Sprite.LAYOUT_FILL_HORIZONTAL, Sprite.LAYOUT_FILL_VERTICAL or Sprite.LAYOUT_FILL_BOTH
• ipadx: internal horizontal padding
• ipady: internal vertical padding
• offsetx: final offset applied to the child on X axis, in logical units. since 2020.7
• offsety: final offset applied to the child on Y axis, in logical units. since 2020.7
• originx: final offset applied to the child on X axis, as a fraction of the child width. since 2020.7
• originy: final offset applied to the child on Y axis, as a fraction of the child height. since 2020.7
• minWidth: minimum width
• minHeight: minimum height
• prefWidth: preferred width
• prefHeight: preferred height
• shrink: allows grid shrinking
• insetTop: the top margin
• insetLeft: the left margin
• insetBottom: the bottom margin
• insetRight: the right margin
• insets: sets the above four margins to the same value at once. since 2020.7

Parameters

constraints: (table) table of layout constraints

Examples

Example: pixels

• 

-- LAYOUT CONSTRAINTS @Nanocore
-- BUTTONS HOLDER
local myholder = Pixel.new(0x0, 0.5, 256, 256)
myholder:setPosition(8, 8)
myholder:setLayoutParameters({
	columnWeights = {1, 1, 1}, -- 3 columns
	rowWeights = {1, 1, 1, 1}, -- 4 rows
	columnWidths = {32, 32, 32}, -- min columns width
	rowHeights = {32, 32, 32, 32}, -- min rows height
})

-- BUTTONS
local mybtn1 = Pixel.new(0xff0000, 1, 32, 32)
mybtn1:setLayoutConstraints({
	gridx = 0,
	gridy = 0,
	gridwidth = 2,
	gridheight = 2,
	anchor = Sprite.LAYOUT_ANCHOR_NORTHWEST,
	fill = Sprite.LAYOUT_FILL_BOTH,
})
myholder:addChild(mybtn1)

local mybtn2 = Pixel.new(0x00ff00, 1, 32, 32)
mybtn2:setLayoutConstraints({
	gridx = 1,
	gridy = 2,
	gridwidth = 1,
	anchor = Sprite.LAYOUT_ANCHOR_NORTHWEST,
	fill = Sprite.LAYOUT_FILL_VERTICAL,
})
myholder:addChild(mybtn2)

local mybtn3 = Pixel.new(0x0000ff, 1, 32, 32)
mybtn3:setLayoutConstraints({
	gridx = 2,
	gridy = 3,
	gridwidth = 1,
	anchor = Sprite.LAYOUT_ANCHOR_NORTHWEST,
	fill = Sprite.LAYOUT_FILL_BOTH,
})
myholder:addChild(mybtn3)

-- ADD TO STAGE
stage:addChild(myholder)

See also

Sprite:setLayoutParameters

---

• Sprite

• Sprite.new

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• Sprite:clearBlendMode
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• Sprite:getAlpha
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• Sprite:getBounds
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• Sprite:getClip
• Sprite:getColorTransform
• Sprite:getDrawCount
• Sprite:getHeight
• Sprite:getLayoutConstraints
• Sprite:getLayoutInfo
• Sprite:getLayoutParameters
• Sprite:getMatrix
• Sprite:getNumChildren
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• Sprite:setLayoutConstraints
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• Sprite.ADD
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• Sprite.EFFECT MODE CONTINUOUS
• Sprite.EFFECT MODE TRIGGERED
• Sprite.LAYOUT ANCHOR CENTER
• Sprite.LAYOUT ANCHOR EAST
• Sprite.LAYOUT ANCHOR NORTH
• Sprite.LAYOUT ANCHOR NORTHEAST
• Sprite.LAYOUT ANCHOR NORTHWEST
• Sprite.LAYOUT ANCHOR SOUTH
• Sprite.LAYOUT ANCHOR SOUTHEAST
• Sprite.LAYOUT ANCHOR SOUTHWEST
• Sprite.LAYOUT ANCHOR WEST
• Sprite.LAYOUT FILL BOTH
• Sprite.LAYOUT FILL HORIZONTAL
• Sprite.LAYOUT FILL NONE
• Sprite.LAYOUT FILL VERTICAL
• Sprite.MULTIPLY
• Sprite.NO ALPHA
• Sprite.SCREEN
• Sprite.new

• Event.ADDED_TO_STAGE
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• Event.REMOVED_FROM_STAGE
• Event.TOUCHES_BEGIN
• Event.TOUCHES_CANCEL
• Event.TOUCHES_END
• Event.TOUCHES_MOVE

---

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