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102 lines
2.8 KiB
102 lines
2.8 KiB
-- @docclass
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UIScrollArea = extends(UIWidget)
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-- public functions
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function UIScrollArea.create()
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local scrollarea = UIScrollArea.internalCreate()
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scrollarea:setClipping(true)
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scrollarea.inverted = false
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return scrollarea
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end
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function UIScrollArea:onStyleApply(styleName, styleNode)
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for name,value in pairs(styleNode) do
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if name == 'vertical-scrollbar' then
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addEvent(function()
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self:setVerticalScrollBar(self:getParent():getChildById(value))
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end)
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elseif name == 'horizontal-scrollbar' then
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addEvent(function()
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self:setHorizontalScrollBar(self:getParent():getChildById(value))
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end)
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elseif name == 'inverted-scroll' then
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self:setInverted(value)
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end
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end
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end
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function UIScrollArea:updateScrollBars()
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local offset = { x = 0, y = 0 }
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local scrollheight = math.max(self:getChildrenRect().height - self:getPaddingRect().height, 0)
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local scrollwidth = math.max(self:getChildrenRect().width - self:getPaddingRect().width, 0)
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local scrollbar = self.verticalScrollBar
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if scrollbar then
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if self.inverted then
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scrollbar:setMinimum(-scrollheight)
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scrollbar:setMaximum(0)
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else
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scrollbar:setMinimum(0)
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scrollbar:setMaximum(scrollheight)
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end
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end
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local scrollbar = self.horizontalScrollBar
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if scrollbar then
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if self.inverted then
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scrollbar:setMinimum(-scrollwidth)
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else
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scrollbar:setMaximum(scrollwidth)
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end
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end
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end
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function UIScrollArea:setVerticalScrollBar(scrollbar)
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self.verticalScrollBar = scrollbar
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self.verticalScrollBar.onValueChange = function(scrollbar, value)
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local virtualOffset = self:getVirtualOffset()
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virtualOffset.y = value
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self:setVirtualOffset(virtualOffset)
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end
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self:updateScrollBars()
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end
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function UIScrollArea:setHorizontalScrollBar(scrollbar)
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self.horizontalScrollBar = scrollbar
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self:updateScrollBars()
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end
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function UIScrollArea:setInverted(inverted)
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self.inverted = inverted
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end
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function UIScrollArea:onLayoutUpdate()
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self:updateScrollBars()
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end
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function UIScrollArea:onMouseWheel(mousePos, mouseWheel)
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if self.verticalScrollBar then
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if mouseWheel == MouseWheelUp then
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self.verticalScrollBar:decrement()
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else
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self.verticalScrollBar:increment()
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end
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end
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return true
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end
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function UIScrollArea:onChildFocusChange(focusedChild, oldFocused, reason)
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if focusedChild and (reason == MouseFocusReason or reason == KeyboardFocusReason) then
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local paddingRect = self:getPaddingRect()
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local delta = paddingRect.y - focusedChild:getY()
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if delta > 0 then
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self.verticalScrollBar:decrement(delta)
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end
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delta = (focusedChild:getY() + focusedChild:getHeight()) - (paddingRect.y + paddingRect.height)
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if delta > 0 then
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self.verticalScrollBar:increment(delta)
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end
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end
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end
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