Initial OpenECOMP Portal commit

[portal.git] / ecomp-portal-FE / client / bower_components / jqTree / src / scroll_handler.coffee

diff --git a/ecomp-portal-FE/client/bower_components/jqTree/src/scroll_handler.coffee b/ecomp-portal-FE/client/bower_components/jqTree/src/scroll_handler.coffee
new file mode 100644 (file)
index 0000000..3456dec
--- /dev/null
+++ b/ecomp-portal-FE/client/bower_components/jqTree/src/scroll_handler.coffee
@@ -0,0 +1,114 @@
+$ = jQuery
+
+
+class ScrollHandler
+    constructor: (tree_widget) ->
+        @tree_widget = tree_widget
+        @previous_top = -1
+        @is_initialized = false
+
+    _initScrollParent: ->
+        getParentWithOverflow = =>
+            css_values = ['overflow', 'overflow-y']
+
+            hasOverFlow = (el) ->
+                for css_value in css_values
+                    if $.css(el, css_value) in ['auto', 'scroll']
+                        return true
+
+                return false
+
+            if hasOverFlow(@tree_widget.$el[0])
+                return @tree_widget.$el
+
+            for el in @tree_widget.$el.parents()
+                if hasOverFlow(el)
+                    return $(el)
+
+            return null
+
+        setDocumentAsScrollParent = =>
+            @scroll_parent_top = 0
+            @$scroll_parent = null
+
+        if @tree_widget.$el.css('position') == 'fixed'
+            setDocumentAsScrollParent()
+
+        $scroll_parent = getParentWithOverflow()
+
+        if $scroll_parent and $scroll_parent.length and $scroll_parent[0].tagName != 'HTML'
+            @$scroll_parent = $scroll_parent
+            @scroll_parent_top = @$scroll_parent.offset().top
+        else
+            setDocumentAsScrollParent()
+
+        @is_initialized = true
+
+    _ensureInit: ->
+        if not @is_initialized
+            @_initScrollParent()
+
+    checkScrolling: ->
+        @_ensureInit()
+
+        hovered_area = @tree_widget.dnd_handler.hovered_area
+
+        if hovered_area and hovered_area.top != @previous_top
+            @previous_top = hovered_area.top
+
+            if @$scroll_parent
+                @_handleScrollingWithScrollParent(hovered_area)
+            else
+                @_handleScrollingWithDocument(hovered_area)
+
+    _handleScrollingWithScrollParent: (area) ->
+        distance_bottom = @scroll_parent_top + @$scroll_parent[0].offsetHeight - area.bottom
+
+        if distance_bottom < 20
+            @$scroll_parent[0].scrollTop += 20
+            @tree_widget.refreshHitAreas()
+            @previous_top = -1
+        else if (area.top - @scroll_parent_top) < 20
+            @$scroll_parent[0].scrollTop -= 20
+            @tree_widget.refreshHitAreas()
+            @previous_top = -1
+
+    _handleScrollingWithDocument: (area) ->
+        distance_top = area.top - $(document).scrollTop()
+
+        if distance_top < 20
+            $(document).scrollTop($(document).scrollTop() - 20)
+        else if $(window).height() - (area.bottom - $(document).scrollTop()) < 20
+            $(document).scrollTop($(document).scrollTop() + 20)
+
+    scrollTo: (top) ->
+        @_ensureInit()
+
+        if @$scroll_parent
+            @$scroll_parent[0].scrollTop = top
+        else
+            tree_top = @tree_widget.$el.offset().top
+            $(document).scrollTop(top + tree_top)
+
+    isScrolledIntoView: (element) ->
+        @_ensureInit()
+
+        $element = $(element)
+
+        if @$scroll_parent
+            view_top = 0
+            view_bottom = @$scroll_parent.height()
+
+            element_top = $element.offset().top - @scroll_parent_top
+            element_bottom = element_top + $element.height()
+        else
+            view_top = $(window).scrollTop()
+            view_bottom = view_top + $(window).height()
+
+            element_top = $element.offset().top
+            element_bottom = element_top + $element.height()
+
+        return (element_bottom <= view_bottom) and (element_top >= view_top)
+
+
+module.exports = ScrollHandler