new: add -p, --passthrough to ignore input

fixes #11

src/dim.rs

@@ -1,6 +1,6 @@
 use log::{debug, error};
 use smithay_client_toolkit::{
-    compositor::{CompositorHandler, CompositorState},
+    compositor::{CompositorHandler, CompositorState, Region},
     delegate_compositor, delegate_keyboard, delegate_layer, delegate_output, delegate_pointer,
     delegate_registry, delegate_seat, delegate_simple, delegate_touch,
     output::{OutputHandler, OutputState},
@@ -51,6 +51,7 @@ pub struct DimData {
     viewporter: SimpleGlobal<WpViewporter, 1>,
 
     alpha: f32,
+    passthrough: bool,
     views: Vec<DimView>,
 
     keyboard: Option<wl_keyboard::WlKeyboard>,
@@ -76,6 +77,7 @@ impl DimData {
         qh: &QueueHandle<Self>,
         layer_shell: LayerShell,
         alpha: f32,
+        passthrough: bool,
     ) -> Self {
         Self {
             compositor,
@@ -89,6 +91,7 @@ impl DimData {
                 .expect("wp_viewporter not available"),
 
             alpha,
+            passthrough,
             views: Vec::new(),
 
             exit: false,
@@ -121,8 +124,15 @@ impl DimData {
             (INIT_SIZE, INIT_SIZE)
         };
 
+        if self.passthrough {
+            let input_region = Region::new(&self.compositor).expect("Failed to get a wl_region");
+            layer.set_keyboard_interactivity(KeyboardInteractivity::None);
+            layer.set_input_region(Some(input_region.wl_region()));
+        } else {
+            layer.set_keyboard_interactivity(KeyboardInteractivity::Exclusive);
+        }
+
         layer.set_exclusive_zone(-1);
-        layer.set_keyboard_interactivity(KeyboardInteractivity::Exclusive);
         layer.set_size(width, height);
         layer.commit();
 
@@ -435,7 +445,7 @@ impl PointerHandler for DimData {
                     if self.alpha == 1.0 {
                         pointer.set_cursor(serial, None, 0, 0);
                     }
-                },
+                }
                 PointerEventKind::Leave { .. } => {}
                 _ => {
                     debug!("Mouse event");

src/main.rs

@@ -38,7 +38,7 @@ fn main() -> anyhow::Result<()> {
         });
     }
 
-    let (mut data, mut event_queue) = create_wl_app(alpha)?;
+    let (mut data, mut event_queue) = create_wl_app(alpha, opts.passthrough)?;
     while !data.should_exit() {
         event_queue
             .blocking_dispatch(&mut data)
@@ -72,7 +72,7 @@ fn get_config(dir: Option<&Path>) -> anyhow::Result<Option<DimOpts>> {
     Ok(Some(config))
 }
 
-fn create_wl_app(alpha: f32) -> anyhow::Result<(DimData, EventQueue<DimData>)> {
+fn create_wl_app(alpha: f32, passthrough: bool) -> anyhow::Result<(DimData, EventQueue<DimData>)> {
     let conn = Connection::connect_to_env().context("Failed to connect to environment")?;
 
     let (globals, event_queue) =
@@ -83,7 +83,7 @@ fn create_wl_app(alpha: f32) -> anyhow::Result<(DimData, EventQueue<DimData>)> {
     let layer_shell = LayerShell::bind(&globals, &qh).context("Layer shell failed?")?;
 
     Ok((
-        DimData::new(compositor, &globals, &qh, layer_shell, alpha),
+        DimData::new(compositor, &globals, &qh, layer_shell, alpha, passthrough),
         event_queue,
     ))
 }

src/opts.rs

@@ -24,6 +24,13 @@ pub struct DimOpts {
     )]
     pub alpha: Option<f32>,
 
+    #[arg(
+        short,
+        long,
+        help = "Make dim ignore input, passing it to lower surfaces. (You probably want to use `-d 0` with this)"
+    )]
+    pub passthrough: bool,
+
     #[serde(skip)]
     #[arg(long, value_name = "PATH", help = "Generate completions at given path")]
     pub gen_completions: Option<PathBuf>,
@@ -50,6 +57,7 @@ impl DimOpts {
         Self {
             duration: other.duration.or(self.duration),
             alpha: other.alpha.or(self.alpha),
+            passthrough: self.passthrough || other.passthrough,
 
             ..self
         }