'use strict' assert = require 'src/assert' log = require 'src/log' utils = require 'src/utils' eventLoop = require 'src/eventLoop' log = log.scope 'Renderer', 'Anchors' {isArray} = Array module.exports = (impl) -> GET_ZERO = -> 0 MAX_LOOPS = 10 queueIndex = 0 queues = [[], []] queue = queues[queueIndex] pending = false updateItems = -> pending = false currentQueue = queue queue = queues[++queueIndex % queues.length] while currentQueue.length anchor = currentQueue.pop() anchor.pending = false anchor.update() return update = -> if @pending return @pending = true queue.push @ unless pending pending = true eventLoop.setImmediate updateItems return getItemProp = left: 'x' top: 'y' right: 'x' bottom: 'y' horizontalCenter: 'x' verticalCenter: 'y' fillWidthSize: 'width' fillHeightSize: 'height' getSourceWatchProps = left: ['onMarginChange'] top: ['onMarginChange'] right: ['onMarginChange', 'onWidthChange'] bottom: ['onMarginChange', 'onHeightChange'] horizontalCenter: ['onMarginChange', 'onWidthChange'] verticalCenter: ['onMarginChange', 'onHeightChange'] fillWidthSize: ['onMarginChange'] fillHeightSize: ['onMarginChange'] getTargetWatchProps = left: parent: [] children: [] sibling: ['onXChange'] top: parent: [] children: [] sibling: ['onYChange'] right: parent: ['onWidthChange'] sibling: ['onXChange', 'onWidthChange'] bottom: parent: ['onHeightChange'] sibling: ['onYChange', 'onHeightChange'] horizontalCenter: parent: ['onWidthChange'] sibling: ['onXChange', 'onWidthChange'] verticalCenter: parent: ['onHeightChange'] sibling: ['onYChange', 'onHeightChange'] fillWidthSize: parent: ['onWidthChange'] children: [] sibling: ['onWidthChange'] fillHeightSize: parent: ['onHeightChange'] children: [] sibling: ['onHeightChange'] getSourceValue = left: (item) -> 0 top: (item) -> 0 right: (item) -> -item._width bottom: (item) -> -item._height horizontalCenter: (item) -> -item._width / 2 verticalCenter: (item) -> -item._height / 2 fillWidthSize: (item) -> 0 fillHeightSize: (item) -> 0 getTargetValue = left: parent: (target) -> 0 children: (target) -> 0 sibling: (target) -> target._x top: parent: (target) -> 0 children: (target) -> 0 sibling: (target) -> target._y right: parent: (target) -> target._width sibling: (target) -> target._x + target._width bottom: parent: (target) -> target._height sibling: (target) -> target._y + target._height horizontalCenter: parent: (target) -> target._width / 2 sibling: (target) -> target._x + target._width / 2 verticalCenter: parent: (target) -> target._height / 2 sibling: (target) -> target._y + target._height / 2 fillWidthSize: parent: (target) -> target._width children: (target) -> tmp = 0 size = 0 child = target.firstChild while child if child._visible tmp = child._x + child._width if tmp > size size = tmp child = child.nextSibling size sibling: (target) -> target._width fillHeightSize: parent: (target) -> target._height children: (target) -> tmp = 0 size = 0 child = target.firstChild while child if child._visible tmp = child._y + child._height if tmp > size size = tmp child = child.nextSibling size sibling: (target) -> target._height getMarginValue = left: (margin) -> margin._left top: (margin) -> margin._top right: (margin) -> -margin._right bottom: (margin) -> -margin._bottom horizontalCenter: (margin) -> margin._left - margin._right verticalCenter: (margin) -> margin._top - margin._bottom fillWidthSize: (margin) -> -margin._left - margin._right fillHeightSize: (margin) -> -margin._top - margin._bottom onParentChange = (oldVal) -> if oldVal for handler in getTargetWatchProps[@line].parent oldVal[handler].disconnect update, @ if val = @targetItem = @item._parent for handler in getTargetWatchProps[@line].parent val[handler] update, @ update.call @ return onNextSiblingChange = (oldVal) -> if oldVal for handler in getTargetWatchProps[@line].sibling oldVal[handler].disconnect update, @ if val = @targetItem = @item._nextSibling for handler in getTargetWatchProps[@line].sibling val[handler] update, @ update.call @ return onPreviousSiblingChange = (oldVal) -> if oldVal for handler in getTargetWatchProps[@line].sibling oldVal[handler].disconnect update, @ if val = @targetItem = @item._previousSibling for handler in getTargetWatchProps[@line].sibling val[handler] update, @ update.call @ return onChildInsert = (child) -> child.onVisibleChange update, @ if @source is 'fillWidthSize' child.onXChange update, @ child.onWidthChange update, @ if @source is 'fillHeightSize' child.onYChange update, @ child.onHeightChange update, @ update.call @ return onChildPop = (child) -> child.onVisibleChange.disconnect update, @ if @source is 'fillWidthSize' child.onXChange.disconnect update, @ child.onWidthChange.disconnect update, @ if @source is 'fillHeightSize' child.onYChange.disconnect update, @ child.onHeightChange.disconnect update, @ update.call @ return onChildrenChange = (added, removed) -> if added onChildInsert.call @, added if removed onChildPop.call @, removed class Anchor pool = [] @factory = (item, source, def) -> if pool.length > 0 and (elem = pool.pop()) Anchor.call elem, item, source, def elem else new Anchor item, source, def constructor: (@item, @source, def) -> item = @item source = @source [target, line] = def line ?= source @target = target @line = line @pending = false @updateLoops = 0 if target is 'parent' or item._parent is target @type = 'parent' else if target is 'children' @type = 'children' else @type = 'sibling' for handler in getSourceWatchProps[source] item[handler] update, @ @prop = getItemProp[source] @getSourceValue = getSourceValue[source] @getTargetValue = getTargetValue[line][@type] @targetItem = null Object.seal @ if typeof @getTargetValue isnt 'function' @getTargetValue = GET_ZERO log.error "Unknown anchor `#{@}` given" switch target when 'parent' @targetItem = item._parent item.onParentChange onParentChange, @ onParentChange.call @, null when 'children' @targetItem = item.children item.onChildrenChange onChildrenChange, @ child = @targetItem.firstChild while child onChildInsert.call @, child child = child.nextSibling when 'nextSibling' @targetItem = item._nextSibling item.onNextSiblingChange onNextSiblingChange, @ onNextSiblingChange.call @, null when 'previousSibling' @targetItem = item._previousSibling item.onPreviousSiblingChange onPreviousSiblingChange, @ onPreviousSiblingChange.call @, null else if not utils.isObject(target) or handler not of target log.error "Unknown anchor `#{@}` given" return if @targetItem = target for handler in getTargetWatchProps[line][@type] @targetItem[handler] update, @ update.call @ update: -> # sometimes it can be already destroyed if not @item or @updateLoops >= MAX_LOOPS return # targetItem can be possibly different than actual value; # e.g. when Anchor listener to change targetItem is not called firstly switch @target when 'parent' targetItem = @item._parent when 'children' targetItem = @item.children when 'nextSibling' targetItem = @item._nextSibling when 'previousSibling' targetItem = @item._previousSibling else {targetItem} = @ if not targetItem or targetItem isnt @targetItem return if targetItem `//` fails = @item._parent fails &&= targetItem isnt @item._children fails &&= @item._parent isnt targetItem fails &&= @item._parent isnt targetItem._parent if fails log.error """ Invalid anchor point; \ you can anchor only to a parent or a sibling; \ item '#{@item.toString()}.anchors.#{@source}: #{@target}' """ `//` r = @getSourceValue(@item) + @getTargetValue(targetItem) else r = 0 if margin = @item._margin r += getMarginValue[@source] margin @updateLoops++ @item[@prop] = r if @updateLoops is MAX_LOOPS log.error """ Potential anchors loop detected; \ recalculating on this anchor (#{@}) has been disabled """ @updateLoops++ else if @updateLoops < MAX_LOOPS @updateLoops-- return destroy: -> switch @target when 'parent' @item.onParentChange.disconnect onParentChange, @ when 'children' @item.onChildrenChange.disconnect onChildrenChange, @ child = @item.children.firstChild while child onChildPop.call @, child, -1 child = child.nextSibling when 'nextSibling' @item.onNextSiblingChange.disconnect onNextSiblingChange, @ when 'previousSibling' @item.onPreviousSiblingChange.disconnect onPreviousSiblingChange, @ for handler in getSourceWatchProps[@source] @item[handler].disconnect update, @ if @targetItem for handler in getTargetWatchProps[@line][@type] @targetItem[handler].disconnect update, @ @item = @targetItem = null pool.push @ return toString: -> "#{@item.toString()}.anchors.#{@source}: #{@target}.#{@line}" getBaseAnchors = centerIn: ['horizontalCenter', 'verticalCenter'] fillWidth: ['fillWidthSize', 'left'] fillHeight: ['fillHeightSize', 'top'] fill: ['fillWidthSize', 'fillHeightSize', 'left', 'top'] getBaseAnchorsPerAnchorType = __proto__: null isMultiAnchor = (source) -> !!getBaseAnchors[source] class MultiAnchor pool = [] @factory = (item, source, def) -> if elem = pool.pop() MultiAnchor.call elem, item, source, def elem else new MultiAnchor item, source, def constructor: (item, source, def) -> assert.lengthOf def, 1 @anchors = [] def = [def[0], ''] @pending = false baseAnchors = getBaseAnchorsPerAnchorType[def[0]]?[source] baseAnchors ?= getBaseAnchors[source] for line in baseAnchors def[1] = line anchor = Anchor.factory item, line, def @anchors.push anchor return update: -> for anchor in @anchors anchor.update() return destroy: -> for anchor in @anchors anchor.destroy() pool.push @ return createAnchor = (item, source, def) -> if isMultiAnchor(source) MultiAnchor.factory item, source, def else Anchor.factory item, source, def exports = setItemAnchor: (type, val) -> if val isnt null assert.isArray val anchors = @_impl.anchors ?= {} if not val and not anchors[type] return if anchors[type] anchors[type].destroy() anchors[type] = null if val anchors[type] = createAnchor(@, type, val) return