293 lines
9.0 KiB
Rust
293 lines
9.0 KiB
Rust
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//! The hotkeys subsystem.
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//!
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//! This handles the PNMixer-rs specific hotkeys as a whole,
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//! including communication with Xlib and intercepting key presses
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//! before they can be interpreted by Gtk/Gdk.
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use audio::{Audio, AudioUser};
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use errors::*;
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use errors;
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use gdk;
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use gdk_sys;
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use gdk_x11;
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use glib::translate::*;
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use glib_sys;
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use hotkey::*;
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use prefs::*;
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use std::mem;
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use std::rc::Rc;
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use w_result::*;
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use x11;
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/// The possible Hotkeys for manipulating the volume.
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pub struct Hotkeys {
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enabled: bool,
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mute_key: Option<Hotkey>,
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up_key: Option<Hotkey>,
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down_key: Option<Hotkey>,
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// need this to access audio in 'key_filter'
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audio: Rc<Audio>,
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auto_unmute: bool,
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}
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impl Hotkeys {
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/// Creates the hotkeys subsystem and binds the hotkeys.
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pub fn new(prefs: &Prefs,
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audio: Rc<Audio>)
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-> WResult<Box<Hotkeys>, errors::Error, errors::Error> {
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debug!("Creating hotkeys control");
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let mut hotkeys =
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Box::new(Hotkeys {
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enabled: false,
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mute_key: None,
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up_key: None,
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down_key: None,
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audio: audio,
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auto_unmute: prefs.behavior_prefs.unmute_on_vol_change,
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});
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let mut warn = vec![];
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push_warning!(hotkeys.reload(prefs), warn);
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/* bind hotkeys */
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let data_ptr =
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unsafe {
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mem::transmute::<&Hotkeys,
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glib_sys::gpointer>(hotkeys.as_ref())
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};
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hotkeys_add_filter(Some(key_filter), data_ptr);
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return WOk(hotkeys, warn);
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}
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/// Reload the Hotkeys from the preferences.
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/// If hotkeys are disabled, just sets all members to `None`.
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/// This has to be called each time the preferences are modified.
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///
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/// # Returns
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///
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/// `Ok(())` on success, otherwise `Err(str)` if some of the hotkeys
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/// could not be grabbed, where `str` is a String that can be
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/// presented via e.g. `run_error_dialog()`.
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pub fn reload(&mut self, prefs: &Prefs) -> Result<()> {
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self.enabled = prefs.hotkey_prefs.enable_hotkeys;
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self.mute_key = None;
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self.up_key = None;
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self.down_key = None;
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/* Return if hotkeys are disabled */
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if self.enabled == false {
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return Ok(());
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}
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let hotkey_prefs = &prefs.hotkey_prefs;
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let new_hotkey = |keyname: &Option<String>| -> (Option<Hotkey>, bool) {
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match keyname {
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&Some(ref k) => {
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let hotkey = Hotkey::new_from_accel(k.as_str());
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if hotkey.as_ref().is_err() {
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(None, true)
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} else {
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(Some(hotkey.unwrap()), false)
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}
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}
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&None => (None, false), // no actual error, just no key
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}
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};
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/* Setup mute hotkey */
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let (m_unmute_key, mute_err) =
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new_hotkey(&hotkey_prefs.mute_unmute_key);
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if m_unmute_key.is_some() {
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self.mute_key = Some(m_unmute_key.unwrap());
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}
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/* Setup volume uphotkey */
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let (m_up_key, up_err) = new_hotkey(&hotkey_prefs.vol_up_key);
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if m_up_key.is_some() {
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self.up_key = Some(m_up_key.unwrap());
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}
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/* Setup volume down hotkey */
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let (m_down_key, down_err) = new_hotkey(&hotkey_prefs.vol_down_key);
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if m_down_key.is_some() {
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self.down_key = Some(m_down_key.unwrap());
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}
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if mute_err || up_err || down_err {
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bail!("Could not grab the following hotkeys:\n{}{}{}",
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if mute_err { "(Mute/Unmute)\n" } else { "" },
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if up_err { "(Volume Up)\n" } else { "" },
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if down_err { "(Volume Down)\n" } else { "" },
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);
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}
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return Ok(());
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}
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/// Bind hotkeys manually. Should be paired with an `unbind()` call.
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pub fn bind(&self) {
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debug!("Bind hotkeys");
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if self.mute_key.is_some() {
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if self.mute_key
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.as_ref()
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.unwrap()
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.grab()
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.is_err() {
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warn!("Could not grab mute key");
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};
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}
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if self.up_key.is_some() {
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if self.up_key
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.as_ref()
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.unwrap()
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.grab()
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.is_err() {
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warn!("Could not grab volume up key");
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};
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}
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if self.down_key.is_some() {
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if self.down_key
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.as_ref()
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.unwrap()
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.grab()
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.is_err() {
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warn!("Could not grab volume down key");
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};
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}
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let data_ptr =
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unsafe { mem::transmute::<&Hotkeys, glib_sys::gpointer>(self) };
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hotkeys_add_filter(Some(key_filter), data_ptr);
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}
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/// Unbind hotkeys manually. Should be paired with a `bind()` call.
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pub fn unbind(&self) {
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debug!("Unbind hotkeys");
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if self.mute_key.is_some() {
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self.mute_key
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.as_ref()
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.unwrap()
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.ungrab();
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}
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if self.up_key.is_some() {
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self.up_key
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.as_ref()
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.unwrap()
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.ungrab();
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}
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if self.down_key.is_some() {
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self.down_key
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.as_ref()
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.unwrap()
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.ungrab();
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}
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let data_ptr =
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unsafe { mem::transmute::<&Hotkeys, glib_sys::gpointer>(self) };
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hotkeys_remove_filter(Some(key_filter), data_ptr);
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}
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}
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impl Drop for Hotkeys {
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fn drop(&mut self) {
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debug!("Freeing hotkeys");
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self.mute_key = None;
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self.up_key = None;
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self.down_key = None;
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let data_ptr =
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unsafe { mem::transmute::<&mut Hotkeys, glib_sys::gpointer>(self) };
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hotkeys_remove_filter(Some(key_filter), data_ptr)
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}
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}
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/// Attaches the `key_filter()` function as a filter
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/// to the root window, so it will intercept window events.
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fn hotkeys_add_filter(function: gdk_sys::GdkFilterFunc,
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data: glib_sys::gpointer) {
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// TODO: all the unwrapping :/
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let window = gdk_x11::gdk_x11_window_foreign_new_for_display(
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&mut gdk::Display::get_default().unwrap(),
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gdk_x11::gdk_x11_get_default_root_xwindow()
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).unwrap();
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unsafe {
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gdk_sys::gdk_window_add_filter(window.to_glib_none().0, function, data);
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}
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}
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/// Removes the previously attached `key_filter()` function from
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/// the root window.
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fn hotkeys_remove_filter(function: gdk_sys::GdkFilterFunc,
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data: glib_sys::gpointer) {
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// TODO: all the unwrapping :/
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let window = gdk_x11::gdk_x11_window_foreign_new_for_display(
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&mut gdk::Display::get_default().unwrap(),
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gdk_x11::gdk_x11_get_default_root_xwindow()
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).unwrap();
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unsafe {
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gdk_sys::gdk_window_remove_filter(window.to_glib_none().0,
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function,
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data);
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}
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}
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/// This function is called before Gtk/Gdk can respond
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/// to any(!) window event and handles pressed hotkeys.
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extern "C" fn key_filter(gdk_xevent: *mut gdk_sys::GdkXEvent,
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_: *mut gdk_sys::GdkEvent,
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data: glib_sys::gpointer)
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-> gdk_sys::GdkFilterReturn {
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let xevent = gdk_xevent as *mut x11::xlib::XKeyEvent;
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let hotkeys: &Hotkeys =
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unsafe { mem::transmute::<glib_sys::gpointer, &Hotkeys>(data) };
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let mute_key = &hotkeys.mute_key;
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let up_key = &hotkeys.up_key;
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let down_key = &hotkeys.down_key;
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let audio = &hotkeys.audio;
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let xevent_type = unsafe { (*xevent).type_ };
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if xevent_type == x11::xlib::KeyPress {
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return gdk_sys::GdkFilterReturn::Continue;
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}
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let xevent_key = unsafe { (*xevent).keycode };
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let xevent_state = unsafe { (*xevent).state };
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if mute_key.as_ref().is_some() &&
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mute_key.as_ref()
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.unwrap()
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.matches(xevent_key as i32,
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gdk::ModifierType::from_bits(xevent_state).unwrap()) {
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just_warn!(audio.toggle_mute(AudioUser::Hotkeys));
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} else if up_key.as_ref().is_some() &&
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up_key.as_ref()
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.unwrap()
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.matches(xevent_key as i32,
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gdk::ModifierType::from_bits(xevent_state)
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.unwrap()) {
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just_warn!(audio.increase_vol(AudioUser::Hotkeys, hotkeys.auto_unmute));
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} else if down_key.as_ref().is_some() &&
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down_key.as_ref()
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.unwrap()
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.matches(xevent_key as i32,
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gdk::ModifierType::from_bits(xevent_state)
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.unwrap()) {
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just_warn!(audio.decrease_vol(AudioUser::Hotkeys, hotkeys.auto_unmute));
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}
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return gdk_sys::GdkFilterReturn::Continue;
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}
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