zng_ext_window/monitor.rs
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use core::fmt;
use std::sync::Arc;
use zng_app::event::{event, event_args, AnyEventArgs};
use zng_app::update::EventUpdate;
use zng_app::view_process::raw_events::{RawMonitorsChangedArgs, RAW_MONITORS_CHANGED_EVENT, RAW_SCALE_FACTOR_CHANGED_EVENT};
use zng_app::view_process::VIEW_PROCESS_INITED_EVENT;
use zng_app::window::{MonitorId, WindowId, WINDOW};
use zng_app_context::app_local;
use zng_layout::unit::{Dip, DipRect, DipSize, DipToPx, Factor, FactorUnits, Ppi, Px, PxPoint, PxRect, PxSize, PxToDip};
use zng_txt::{ToTxt, Txt};
use zng_unique_id::IdMap;
use zng_var::{impl_from_and_into_var, var, ArcVar, ReadOnlyArcVar, Var, VarValue};
use zng_view_api::window::VideoMode;
use crate::WINDOWS;
app_local! {
pub(super) static MONITORS_SV: MonitorsService = const { MonitorsService { monitors: IdMap::new() } };
}
/// Monitors service.
///
/// List monitor screens and configure the PPI of a given monitor.
///
/// # Uses
///
/// Uses of this service:
///
/// #### Start Position
///
/// Windows are positioned on a virtual screen that overlaps all monitors, but all position configuration is done relative to
/// an specific parent monitor, it is important to track the parent monitor as it defines properties that affect the layout of the window.
/// This service is used to provide information to implement this feature.
///
/// #### Fullscreen
///
/// To set a window to fullscreen a monitor must be selected, by default it can be the one the window is at but
/// the users may want to select a monitor. To enter fullscreen exclusive the video mode must also be decided, all video
/// modes supported by the monitor are available in the [`MonitorInfo`] value.
///
/// #### Real-Size Preview
///
/// Some apps, like image editors, may implement a feature where the user can preview the *real* dimensions of
/// the content they are editing, to accurately implement this you must known the real dimensions of the monitor screen,
/// unfortunately this information is not provided by display drivers. You can ask the user to measure their screen and
/// set the **pixel-per-inch** ratio for the screen using the [`ppi`] variable, this value is then available in the [`LayoutMetrics`]
/// for the next layout. If not set, the default is `96.0ppi`.
///
/// # Provider
///
/// This service is provided by the [`WindowManager`].
///
/// [`ppi`]: MonitorInfo::ppi
/// [`scale_factor`]: MonitorInfo::scale_factor
/// [`LayoutMetrics`]: zng_layout::context::LayoutMetrics
/// [`WindowManager`]: crate::WindowManager
pub struct MONITORS;
impl MONITORS {
/// Get monitor info.
///
/// Returns `None` if the monitor was not found or the app is running in headless mode without renderer.
pub fn monitor(&self, monitor_id: MonitorId) -> Option<MonitorInfo> {
MONITORS_SV.read().monitors.get(&monitor_id).cloned()
}
/// Iterate over all available monitors.
///
/// Is empty if no monitor was found or the app is running in headless mode without renderer.
pub fn available_monitors(&self) -> Vec<MonitorInfo> {
MONITORS_SV.read().monitors.values().cloned().collect()
}
/// Gets the monitor info marked as primary.
pub fn primary_monitor(&self) -> Option<MonitorInfo> {
MONITORS_SV.read().monitors.values().find(|m| m.is_primary().get()).cloned()
}
}
pub(super) struct MonitorsService {
monitors: IdMap<MonitorId, MonitorInfo>,
}
impl MonitorsService {
fn on_monitors_changed(&mut self, args: &RawMonitorsChangedArgs) {
let mut available_monitors: IdMap<_, _> = args.available_monitors.iter().cloned().collect();
let mut removed = vec![];
let mut changed = vec![];
self.monitors.retain(|key, value| {
if let Some(new) = available_monitors.remove(key) {
if value.update(new) {
changed.push(*key);
}
true
} else {
removed.push(*key);
false
}
});
let mut added = Vec::with_capacity(available_monitors.len());
for (id, info) in available_monitors {
added.push(id);
self.monitors.insert(id, MonitorInfo::from_gen(id, info));
}
if !removed.is_empty() || !added.is_empty() || !changed.is_empty() {
let args = MonitorsChangedArgs::new(args.timestamp, args.propagation().clone(), removed, added, changed);
MONITORS_CHANGED_EVENT.notify(args);
}
}
pub(super) fn on_pre_event(update: &EventUpdate) {
if let Some(args) = RAW_SCALE_FACTOR_CHANGED_EVENT.on(update) {
if let Some(m) = MONITORS_SV.read().monitors.get(&args.monitor_id) {
m.scale_factor.set(args.scale_factor);
}
} else if let Some(args) = RAW_MONITORS_CHANGED_EVENT.on(update) {
MONITORS_SV.write().on_monitors_changed(args);
} else if let Some(args) = VIEW_PROCESS_INITED_EVENT.on(update) {
let args = RawMonitorsChangedArgs::new(args.timestamp, args.propagation().clone(), args.available_monitors.clone());
MONITORS_SV.write().on_monitors_changed(&args);
}
}
}
/// "Monitor" configuration used by windows in [headless mode].
///
/// [headless mode]: zng_app::window::WindowMode::is_headless
#[derive(Clone, Copy, PartialEq)]
pub struct HeadlessMonitor {
/// The scale factor used for the headless layout and rendering.
///
/// If set to `None`, falls back to the [`parent`] scale-factor, or `1.0` if the headless window has not parent.
///
/// `None` by default.
///
/// [`parent`]: crate::WindowVars::parent
pub scale_factor: Option<Factor>,
/// Size of the imaginary monitor screen that contains the headless window.
///
/// This is used to calculate relative lengths in the window size definition and is defined in
/// layout pixels instead of device like in a real monitor info.
///
/// `(11608, 8708)` by default.
pub size: DipSize,
/// Pixel-per-inches used for the headless layout and rendering.
pub ppi: Ppi,
}
impl fmt::Debug for HeadlessMonitor {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if f.alternate() || self.ppi != Ppi::default() {
f.debug_struct("HeadlessMonitor")
.field("scale_factor", &self.scale_factor)
.field("screen_size", &self.size)
.field("ppi", &self.ppi)
.finish()
} else {
write!(f, "({:?}, ({}, {}))", self.scale_factor, self.size.width, self.size.height)
}
}
}
impl HeadlessMonitor {
/// New with custom size at `None` scale.
pub fn new(size: DipSize) -> Self {
HeadlessMonitor {
scale_factor: None,
size,
ppi: Ppi::default(),
}
}
/// New with custom size and scale.
pub fn new_scaled(size: DipSize, scale_factor: Factor) -> Self {
HeadlessMonitor {
scale_factor: Some(scale_factor),
size,
ppi: Ppi::default(),
}
}
/// New with default size `(11608, 8708)` and custom scale.
pub fn new_scale(scale_factor: Factor) -> Self {
HeadlessMonitor {
scale_factor: Some(scale_factor),
..Self::default()
}
}
}
impl Default for HeadlessMonitor {
/// New `(11608, 8708)` at `None` scale.
fn default() -> Self {
(11608, 8708).into()
}
}
impl_from_and_into_var! {
fn from<W: Into<Dip>, H: Into<Dip>>((width, height): (W, H)) -> HeadlessMonitor {
HeadlessMonitor::new(DipSize::new(width.into(), height.into()))
}
fn from<W: Into<Dip>, H: Into<Dip>, F: Into<Factor>>((width, height, scale): (W, H, F)) -> HeadlessMonitor {
HeadlessMonitor::new_scaled(DipSize::new(width.into(), height.into()), scale.into())
}
}
/// All information about a monitor that [`MONITORS`] can provide.
#[derive(Clone)]
pub struct MonitorInfo {
id: MonitorId,
is_primary: ArcVar<bool>,
name: ArcVar<Txt>,
position: ArcVar<PxPoint>,
size: ArcVar<PxSize>,
video_modes: ArcVar<Vec<VideoMode>>,
scale_factor: ArcVar<Factor>,
ppi: ArcVar<Ppi>,
}
impl fmt::Debug for MonitorInfo {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("MonitorFullInfo").field("id", &self.id).finish_non_exhaustive()
}
}
impl MonitorInfo {
/// New from a [`zng_view_api::MonitorInfo`].
fn from_gen(id: MonitorId, info: zng_view_api::window::MonitorInfo) -> Self {
MonitorInfo {
id,
is_primary: var(info.is_primary),
name: var(info.name.to_txt()),
position: var(info.position),
size: var(info.size),
scale_factor: var(info.scale_factor),
video_modes: var(info.video_modes),
ppi: var(Ppi::default()),
}
}
/// Update variables from fresh [`zng_view_api::MonitorInfo`],
/// returns if any value changed.
fn update(&self, info: zng_view_api::window::MonitorInfo) -> bool {
fn check_set<T: VarValue + PartialEq>(var: &impl Var<T>, value: T) -> bool {
let ne = var.with(|v| v != &value);
var.set(value).unwrap();
ne
}
check_set(&self.is_primary, info.is_primary)
| check_set(&self.name, info.name.to_txt())
| check_set(&self.position, info.position)
| check_set(&self.size, info.size)
| check_set(&self.scale_factor, info.scale_factor)
| check_set(&self.video_modes, info.video_modes)
}
/// Unique ID.
pub fn id(&self) -> MonitorId {
self.id
}
/// If this monitor is the primary screen.
pub fn is_primary(&self) -> ReadOnlyArcVar<bool> {
self.is_primary.read_only()
}
/// Name of the monitor.
pub fn name(&self) -> ReadOnlyArcVar<Txt> {
self.name.read_only()
}
/// Top-left offset of the monitor region in the virtual screen, in pixels.
pub fn position(&self) -> ReadOnlyArcVar<PxPoint> {
self.position.read_only()
}
/// Width/height of the monitor region in the virtual screen, in pixels.
pub fn size(&self) -> ReadOnlyArcVar<PxSize> {
self.size.read_only()
}
/// Exclusive fullscreen video modes.
pub fn video_modes(&self) -> ReadOnlyArcVar<Vec<VideoMode>> {
self.video_modes.read_only()
}
/// The monitor scale factor.
///
/// Can update if the user changes system settings.
pub fn scale_factor(&self) -> ReadOnlyArcVar<Factor> {
self.scale_factor.read_only()
}
/// Pixel-per-inch config var.
pub fn ppi(&self) -> ArcVar<Ppi> {
self.ppi.clone()
}
/// Gets the monitor area in pixels.
pub fn px_rect(&self) -> PxRect {
let pos = self.position.get();
let size = self.size.get();
PxRect::new(pos, size)
}
/// Gets the monitor area in device independent pixels.
pub fn dip_rect(&self) -> DipRect {
let pos = self.position.get();
let size = self.size.get();
let factor = self.scale_factor.get();
PxRect::new(pos, size).to_dip(factor)
}
/// Bogus metadata for the [`MonitorId::fallback`].
///
/// [`MonitorId::fallback`]: crate::monitor::MonitorId::fallback
pub fn fallback() -> Self {
let defaults = HeadlessMonitor::default();
let fct = 1.fct();
Self {
id: MonitorId::fallback(),
is_primary: var(false),
name: var("<fallback>".into()),
position: var(PxPoint::zero()),
size: var(defaults.size.to_px(fct)),
video_modes: var(vec![]),
scale_factor: var(fct),
ppi: var(Ppi::default()),
}
}
}
/// A selector that returns a [`MonitorInfo`].
#[derive(Clone, Default)]
pub enum MonitorQuery {
/// The parent window monitor, or `Primary` if the window has no parent.
///
/// Note that the window is not moved automatically if the parent window is moved to another monitor, only
/// after the query variable updates.
///
/// This is the default value.
#[default]
ParentOrPrimary,
/// The primary monitor, if there is any monitor.
Primary,
/// Custom query closure.
///
/// If the closure returns `None` the `ParentOrPrimary` query is used, if there is any.
///
/// You can use the [`MONITORS`] service in the query closure to select a monitor.
Query(Arc<dyn Fn() -> Option<MonitorInfo> + Send + Sync>),
}
impl std::fmt::Debug for MonitorQuery {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if f.alternate() {
write!(f, "MonitorQuery::")?;
}
match self {
Self::ParentOrPrimary => write!(f, "ParentOrPrimary"),
Self::Primary => write!(f, "Primary"),
Self::Query(_) => write!(f, "Query(_)"),
}
}
}
impl MonitorQuery {
/// New query.
pub fn new(query: impl Fn() -> Option<MonitorInfo> + Send + Sync + 'static) -> Self {
Self::Query(Arc::new(query))
}
/// Runs the query.
pub fn select(&self) -> Option<MonitorInfo> {
self.select_for(WINDOW.id())
}
fn select_for(&self, win_id: WindowId) -> Option<MonitorInfo> {
match self {
MonitorQuery::ParentOrPrimary => Self::parent_or_primary_query(win_id),
MonitorQuery::Primary => Self::primary_query(),
MonitorQuery::Query(q) => q(),
}
}
/// Runs the query. Falls back to `Primary`, or the largest or [`MonitorInfo::fallback`].
pub fn select_fallback(&self) -> MonitorInfo {
match self {
MonitorQuery::ParentOrPrimary => Self::parent_or_primary_query(WINDOW.id()),
MonitorQuery::Primary => Self::primary_query(),
MonitorQuery::Query(q) => q().or_else(Self::primary_query),
}
.unwrap_or_else(Self::fallback)
}
fn fallback() -> MonitorInfo {
let mut best = MonitorInfo::fallback();
let mut best_area = Px(0);
for m in MONITORS.available_monitors() {
let m_area = m.px_rect().area();
if m_area > best_area {
best = m;
best_area = m_area;
}
}
best
}
fn parent_or_primary_query(win_id: WindowId) -> Option<MonitorInfo> {
if let Some(parent) = WINDOWS.vars(win_id).unwrap().parent().get() {
if let Ok(w) = WINDOWS.vars(parent) {
return if let Some(monitor) = w.actual_monitor().get() {
MONITORS.monitor(monitor)
} else {
w.monitor().get().select_for(parent)
};
}
}
MONITORS.primary_monitor()
}
fn primary_query() -> Option<MonitorInfo> {
MONITORS.primary_monitor()
}
}
impl PartialEq for MonitorQuery {
/// Returns `true` only if both are [`MonitorQuery::Primary`].
fn eq(&self, other: &Self) -> bool {
matches!((self, other), (Self::Primary, Self::Primary))
}
}
event_args! {
/// [`MONITORS_CHANGED_EVENT`] args.
pub struct MonitorsChangedArgs {
/// Removed monitors.
pub removed: Vec<MonitorId>,
/// Added monitors.
///
/// Use the [`MONITORS`] service to get metadata about the added monitors.
pub added: Vec<MonitorId>,
/// Modified monitors.
///
/// The monitor metadata is tracked using variables that are now flagged new.
pub modified: Vec<MonitorId>,
..
/// Broadcast to all widgets.
fn delivery_list(&self, list: &mut UpdateDeliveryList) {
list.search_all()
}
}
}
event! {
/// Monitors added, removed or modified event.
pub static MONITORS_CHANGED_EVENT: MonitorsChangedArgs;
}