ui overhaul

sys/apis/ui/components/ScrollingGrid.lua

@@ -0,0 +1,60 @@
+local class = require('class')
+local UI    = require('ui')
+local Util  = require('util')
+
+--[[-- ScrollingGrid  --]]--
+UI.ScrollingGrid = class(UI.Grid)
+UI.ScrollingGrid.defaults = {
+	UIElement = 'ScrollingGrid',
+	scrollOffset = 0,
+	marginRight = 1,
+}
+function UI.ScrollingGrid:postInit()
+	self.scrollBar = UI.ScrollBar()
+end
+
+function UI.ScrollingGrid:drawRows()
+	UI.Grid.drawRows(self)
+	self.scrollBar:draw()
+end
+
+function UI.ScrollingGrid:getViewArea()
+	local y = 1
+	if not self.disableHeader then
+		y = y + self.headerHeight
+	end
+
+	return {
+		static      = true,                    -- the container doesn't scroll
+		y           = y,                       -- scrollbar Y
+		height      = self.pageSize,           -- viewable height
+		totalHeight = Util.size(self.values),  -- total height
+		offsetY     = self.scrollOffset,       -- scroll offset
+	}
+end
+
+function UI.ScrollingGrid:getStartRow()
+	local ts = Util.size(self.values)
+	if ts < self.pageSize then
+		self.scrollOffset = 0
+	end
+	return self.scrollOffset + 1
+end
+
+function UI.ScrollingGrid:setIndex(index)
+	if index < self.scrollOffset + 1 then
+		self.scrollOffset = index - 1
+	elseif index - self.scrollOffset > self.pageSize then
+		self.scrollOffset = index - self.pageSize
+	end
+
+	if self.scrollOffset < 0 then
+		self.scrollOffset = 0
+	else
+		local ts = Util.size(self.values)
+		if self.pageSize + self.scrollOffset + 1 > ts then
+			self.scrollOffset = math.max(0, ts - self.pageSize)
+		end
+	end
+	UI.Grid.setIndex(self, index)
+end