Initial commit

1 files changed, 55 insertions, 0 deletions

diff --git a/slider2d.lua b/slider2d.lua
new file mode 100644
index 0000000..023d16f
--- /dev/null
+++ b/slider2d.lua
@@ -0,0 +1,55 @@
+local core = require((...):match("^(.+)%.[^%.]+") .. '.core')
+
+return function(info, x,y,w,h, draw)
+	assert(type(info) == 'table' and type(info.value) == "table", "Incomplete slider value info")
+	info.min = info.min or {x = 0, y = 0}
+	info.max = info.max or {x = math.max(info.value.x or 0, 1), y = math.max(info.value.y or 0, 1)}
+	info.step = info.step or {x = (info.max.x - info.min.x)/50, y = (info.max.y - info.min.y)/50}
+	local fraction = {
+		x = (info.value.x - info.min.x) / (info.max.x - info.min.x),
+		y = (info.value.y - info.min.y) / (info.max.y - info.min.y),
+	}
+
+	local id = core.generateID()
+	core.mouse.updateState(id, x,y,w,h)
+	core.makeTabable(id)
+	core.registerDraw(id,draw or core.style.Slider2D, fraction, x,y,w,h)
+
+	-- update value
+	if core.isActive(id) then
+		core.setKeyFocus(id)
+		fraction = {
+			x = (core.mouse.x - x) / w,
+			y = (core.mouse.y - y) / h,
+		}
+		fraction.x = math.min(1, math.max(0, fraction.x))
+		fraction.y = math.min(1, math.max(0, fraction.y))
+		local v = {
+			x = fraction.x * (info.max.x - info.min.x) + info.min.x,
+			y = fraction.y * (info.max.y - info.min.y) + info.min.y,
+		}
+		if v.x ~= info.value.x or v.y ~= info.value.y then
+			info.value = v
+			return true
+		end
+	end
+
+	local changed = false
+	if core.hasKeyFocus(id) then
+		if core.keyboard.key == 'down' then
+			info.value.y = math.min(info.max.y, info.value.y + info.step.y)
+			changed = true
+		elseif core.keyboard.key == 'up' then
+			info.value.y = math.max(info.min.y, info.value.y - info.step.y)
+			changed = true
+		end
+		if core.keyboard.key == 'right' then
+			info.value.x = math.min(info.max.x, info.value.x + info.step.x)
+			changed = true
+		elseif core.keyboard.key == 'left' then
+			info.value.x = math.max(info.min.x, info.value.x - info.step.x)
+			changed = true
+		end
+	end
+	return changed
+end