86 lines
2.7 KiB
Rust
86 lines
2.7 KiB
Rust
//! Types related to drag-and-drop
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use cosmic::{
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cctk::wayland_client::{protocol::wl_output, Proxy},
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iced::clipboard::mime::AsMimeTypes,
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};
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use std::{borrow::Cow, sync::LazyLock};
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use crate::backend::{ZcosmicToplevelHandleV1, ZcosmicWorkspaceHandleV1};
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// Include `pid` in mime. Want to drag between our surfaces, but not another
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// process, if we use Wayland object ids.
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#[allow(dead_code)]
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static WORKSPACE_MIME: LazyLock<String> =
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LazyLock::new(|| format!("text/x.cosmic-workspace-id-{}", std::process::id()));
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static TOPLEVEL_MIME: LazyLock<String> =
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LazyLock::new(|| format!("text/x.cosmic-toplevel-id-{}", std::process::id()));
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#[derive(Clone, Debug)]
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pub enum DragSurface {
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#[allow(dead_code)]
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Workspace(ZcosmicWorkspaceHandleV1),
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Toplevel(ZcosmicToplevelHandleV1),
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}
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// TODO store protocol object id?
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#[derive(Clone, Debug)]
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pub struct DragToplevel {}
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impl AsMimeTypes for DragToplevel {
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fn available(&self) -> Cow<'static, [String]> {
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vec![TOPLEVEL_MIME.clone()].into()
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}
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fn as_bytes(&self, mime_type: &str) -> Option<Cow<'static, [u8]>> {
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if mime_type == *TOPLEVEL_MIME {
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Some(Vec::new().into())
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} else {
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None
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}
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}
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}
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impl cosmic::iced::clipboard::mime::AllowedMimeTypes for DragToplevel {
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fn allowed() -> Cow<'static, [String]> {
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vec![TOPLEVEL_MIME.clone()].into()
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}
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}
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impl TryFrom<(Vec<u8>, std::string::String)> for DragToplevel {
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type Error = ();
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fn try_from((_bytes, mime_type): (Vec<u8>, String)) -> Result<Self, ()> {
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if mime_type == *TOPLEVEL_MIME {
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Ok(Self {})
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} else {
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Err(())
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}
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}
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}
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#[derive(Clone, Debug, PartialEq)]
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#[repr(u8)]
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pub enum DropTarget {
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WorkspaceSidebarEntry(ZcosmicWorkspaceHandleV1, wl_output::WlOutput),
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OutputToplevels(ZcosmicWorkspaceHandleV1, wl_output::WlOutput),
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}
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impl DropTarget {
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/// Encode as a u64 for iced/smithay_sctk to associate drag destination area with widget.
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pub fn drag_id(&self) -> u64 {
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// https://doc.rust-lang.org/std/mem/fn.discriminant.html#accessing-the-numeric-value-of-the-discriminant
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let discriminant = unsafe { *<*const _>::from(self).cast::<u8>() };
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match self {
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Self::WorkspaceSidebarEntry(workspace, _output) => {
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// TODO consider workspace that span multiple outputs?
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let id = workspace.id().protocol_id();
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(u64::from(discriminant) << 32) | u64::from(id)
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}
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Self::OutputToplevels(_workspace, output) => {
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let id = output.id().protocol_id();
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(u64::from(discriminant) << 32) | u64::from(id)
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}
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}
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}
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}
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