Commit on behalf of @mart-on-windows.

2 files changed, 63 insertions, 0 deletions

diff --git a/README.md b/README.md
index 1f5f35f..970cb36 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,7 @@ Plugin | Description
 [`motiontrail`](plugins/motiontrail.lua?raw=1) | Adds a motion-trail to the caret *([screenshot](https://user-images.githubusercontent.com/3920290/83256814-085ccb00-a1ab-11ea-9e35-e6633cbed1a9.gif))*
 ~~[`nagbar`](https://github.com/takase1121/lite-nagbar)*~~ | integrated in lite-xl ~~consistent and _beautiful_ confirmation dialogs for lite and lite-xl *([gif](https://raw.githubusercontent.com/takase1121/lite-nagbar/master/assets/preview.gif))*~~
 [`navigate`](plugins/navigate.lua?raw=1) | Allows moving back and forward between document positions, reducing the amount of scrolling
+[`opacity`](plugins/opacity.lua?raw=1) | Change the opaqueness/transparency of `lite-xl` using shift+mousewheel or a command.
 [`open_ext`](plugins/open_ext.lua?raw=1) | Automatically prompts you if you tried to open a binary file in the editor
 [`openfilelocation`](plugins/openfilelocation.lua?raw=1) | Opens the parent directory of the current file in the file manager
 [`openselected`](plugins/openselected.lua?raw=1) | Opens the selected filename or url
diff --git a/plugins/opacity.lua b/plugins/opacity.lua
new file mode 100644
index 0000000..8dd0d9a
--- /dev/null
+++ b/plugins/opacity.lua
@@ -0,0 +1,62 @@
+-- mod-version:2 -- lite-xl 2.0
+local common = require "core.common"
+local command = require "core.command"
+local keymap = require "core.keymap"
+local RootView = require "core.rootview"
+
+local opacity_on = true
+local use_mousewheel = true
+local opacity_steps = 0.05
+local default_opacity = 1
+local current_opacity = default_opacity
+
+local function set_opacity(opacity)
+  if not opacity_on then opacity_on = true end
+  current_opacity = common.clamp(opacity, 0.2, 1)
+  system.set_window_opacity(current_opacity)
+end
+
+local on_mouse_wheel = RootView.on_mouse_wheel
+
+function RootView:on_mouse_wheel(d, ...)
+  if keymap.modkeys["shift"] and use_mousewheel then
+    if d < 0 then command.perform "opacity:decrease" end
+    if d > 0 then command.perform "opacity:increase" end
+  else
+    return on_mouse_wheel(self, d, ...)
+  end
+end
+
+local function tog_opacity()
+  opacity_on = not opacity_on
+  if opacity_on then
+    system.set_window_opacity(current_opacity)
+  else
+    system.set_window_opacity(default_opacity)
+  end
+end
+
+local function res_opacity()
+  set_opacity(default_opacity)
+end
+
+local function inc_opacity()
+  set_opacity(current_opacity + opacity_steps)
+end
+
+local function dec_opacity()
+  set_opacity(current_opacity - opacity_steps)
+end
+
+command.add(nil, {
+  ["opacity:toggle"  ] = function() tog_opacity() end,
+  ["opacity:reset"   ] = function() res_opacity() end,
+  ["opacity:decrease"] = function() dec_opacity() end,
+  ["opacity:increase"] = function() inc_opacity() end,
+  ["opacity:toggle mouse wheel use"] = function() use_mousewheel = not use_mousewheel end,
+})
+
+keymap.add {
+  ["shift+f11"] = "opacity:toggle",
+  ["ctrl+f11"]  = "opacity:toggle mouse wheel use",
+}