From 98cf070830967078bebe47a1da9589543d4da32d Mon Sep 17 00:00:00 2001
From: jill <oatmealine@disroot.org>
Date: Sun, 19 Sep 2021 23:04:39 +0300
Subject: [PATCH] make scrollbar clickable

---
 src/dropdown.lua | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/dropdown.lua b/src/dropdown.lua
index 8d9152f..768368b 100644
--- a/src/dropdown.lua
+++ b/src/dropdown.lua
@@ -22,6 +22,8 @@ self.openDropdown = 0
 local dropdownScroll = 0
 local dropdownScrollE = 0
 
+local scrollbarSize = 4
+
 local function skeys(t)
   local k = {}
   for n,v in pairs(t) do table.insert(k, {n, v}) end
@@ -211,6 +213,18 @@ function self.update(dt)
       v.open = mix(v.open, 0, dt * 20)
     end
   end
+
+  if love.mouse.isDown(1) then
+    local x, y = love.mouse.getPosition()
+    for i,v in ipairs(dropdowns) do
+      local h = fontHeight + margin
+      if self.openDropdown == i then
+        if x > v.x and x > v.x + v.width - scrollbarSize and y > v.y + h and y < v.y + h * (math.min(#v.options, maxDropdown) + 1) and not (#v.options < maxDropdown) then
+          dropdownScroll = ((y - (v.y + h)) / (h * (math.min(#v.options, maxDropdown)))) * -(#v.options - maxDropdown + 1)
+        end
+      end
+    end
+  end
 end
 
 function self.render()
@@ -295,9 +309,9 @@ function self.render()
       if #v.options > maxDropdown then
         local displayed = maxDropdown / (#v.options)
         local scroll = math.abs(dropdownScrollE) / (#v.options - maxDropdown + 1)
-        local size = 3
+        local size = scrollbarSize
 
-        love.graphics.setColor(1, 1, 1, 0.8 * v.open)
+        love.graphics.setColor(1, 1, 1, v.open)
         love.graphics.rectangle('fill', x + w - size, y + h + scroll * (1 - displayed) * (maxDropdown - 1) * h * v.open, size, displayed * (maxDropdown - 1) * h * v.open)
       end
     end
@@ -338,7 +352,7 @@ function self.mousereleased(x, y, m)
   for i,v in ipairs(dropdowns) do
     local h = fontHeight + margin
     if self.openDropdown == i then
-      if x > v.x and x < v.x + v.width and y > v.y + h and y < v.y + h * (math.min(#v.options, maxDropdown) + 1) and m == 1 then
+      if x > v.x and x < v.x + v.width and y > v.y + h and y < v.y + h * (math.min(#v.options, maxDropdown) + 1) and m == 1 and (x < v.x + v.width - scrollbarSize or #v.options < maxDropdown) then
         v.selected = math.floor((y - v.y) / h - dropdownScrollE)
         self.openDropdown = 0
         dropdownValueCache[v.name] = {selected = v.selected}