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// Copyright 2019 The Druid Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Custom commands.
use std::any::{self, Any};
use std::{
marker::PhantomData,
sync::{Arc, Mutex},
};
use crate::{WidgetId, WindowId};
/// The identity of a [`Selector`].
///
/// [`Selector`]: struct.Selector.html
pub(crate) type SelectorSymbol = &'static str;
/// An identifier for a particular command.
///
/// This should be a unique string identifier.
/// Having multiple selectors with the same identifier but different payload
/// types is not allowed and can cause [`Command::get`] and [`get_unchecked`] to panic.
///
/// The type parameter `T` specifies the command's payload type.
/// See [`Command`] for more information.
///
/// Certain `Selector`s are defined by Druid, and have special meaning
/// to the framework; these are listed in the [`druid::commands`] module.
///
/// [`Command`]: struct.Command.html
/// [`Command::get`]: struct.Command.html#method.get
/// [`get_unchecked`]: struct.Command.html#method.get_unchecked
#[derive(Debug, PartialEq, Eq)]
pub struct Selector<T = ()>(SelectorSymbol, PhantomData<T>);
/// An arbitrary command.
///
/// A `Command` consists of a [`Selector`], that indicates what the command is
/// and what type of payload it carries, as well as the actual payload.
///
/// If the payload can't or shouldn't be cloned,
/// wrapping it with [`SingleUse`] allows you to `take` the payload.
/// The [`SingleUse`] docs give an example on how to do this.
///
/// Generic payloads can be achieved with `Selector<Box<dyn Any>>`.
/// In this case it could make sense to use utility functions to construct
/// such commands in order to maintain as much static typing as possible.
/// The [`EventCtx::new_window`] method is an example of this.
///
/// # Examples
/// ```
/// use druid::{Command, Selector, Target};
///
/// let selector = Selector::new("process_rows");
/// let rows = vec![1, 3, 10, 12];
/// let command = selector.with(rows);
///
/// assert_eq!(command.get(selector), Some(&vec![1, 3, 10, 12]));
/// ```
///
/// [`EventCtx::new_window`]: crate::EventCtx::new_window
#[derive(Debug, Clone)]
pub struct Command {
symbol: SelectorSymbol,
payload: Arc<dyn Any>,
target: Target,
}
/// A message passed up the tree from a [`Widget`] to its ancestors.
///
/// In the course of handling an event, a [`Widget`] may change some internal
/// state that is of interest to one of its ancestors. In this case, the widget
/// may submit a [`Notification`].
///
/// In practice, a [`Notification`] is very similar to a [`Command`]; the
/// main distinction relates to delivery. [`Command`]s are delivered from the
/// root of the tree down towards the target, and this delivery occurs after
/// the originating event call has returned. [`Notification`]s are delivered *up*
/// the tree, and this occurs *during* event handling; immediately after the
/// child widget's [`event`] method returns, the notification will be delivered
/// to the child's parent, and then the parent's parent, until the notification
/// is handled.
///
/// [`Widget`]: crate::Widget
/// [`event`]: crate::Widget::event
#[derive(Clone)]
pub struct Notification {
symbol: SelectorSymbol,
payload: Arc<dyn Any>,
source: WidgetId,
route: WidgetId,
warn_if_unused: bool,
}
/// A wrapper type for [`Command`] payloads that should only be used once.
///
/// This is useful if you have some resource that cannot be
/// cloned, and you wish to send it to another widget.
///
/// # Examples
/// ```
/// use druid::{Command, Selector, SingleUse, Target};
///
/// struct CantClone(u8);
///
/// let selector = Selector::new("use-once");
/// let num = CantClone(42);
/// let command = selector.with(SingleUse::new(num));
///
/// let payload: &SingleUse<CantClone> = command.get_unchecked(selector);
/// if let Some(num) = payload.take() {
/// // now you own the data
/// assert_eq!(num.0, 42);
/// }
///
/// // subsequent calls will return `None`
/// assert!(payload.take().is_none());
/// ```
pub struct SingleUse<T>(Mutex<Option<T>>);
/// The target of a [`Command`].
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Target {
/// The target is the top-level application.
///
/// The `Command` will be delivered to all open windows, and all widgets
/// in each window. Delivery will stop if the event is [`handled`].
///
/// [`handled`]: crate::EventCtx::set_handled
Global,
/// The target is a specific window.
///
/// The `Command` will be delivered to all widgets in that window.
/// Delivery will stop if the event is [`handled`].
///
/// [`handled`]: crate::EventCtx::set_handled
Window(WindowId),
/// The target is a specific widget.
Widget(WidgetId),
/// The target will be determined automatically.
///
/// How this behaves depends on the context used to submit the command.
/// If the command is submitted within a `Widget` method, then it will be sent to the host
/// window for that widget. If it is from outside the application, via [`ExtEventSink`],
/// or from the root [`AppDelegate`] then it will be sent to [`Target::Global`] .
///
/// [`ExtEventSink`]: crate::ExtEventSink
/// [`AppDelegate`]: crate::AppDelegate
Auto,
}
/// Commands with special meaning, defined by Druid.
///
/// See [`Command`] for more info.
pub mod sys {
use std::any::Any;
use super::Selector;
use crate::{
sub_window::{SubWindowDesc, SubWindowUpdate},
FileDialogOptions, FileInfo, Rect, SingleUse, WidgetId, WindowConfig,
};
/// Quit the running application. This command is handled by the Druid library.
pub const QUIT_APP: Selector = Selector::new("druid-builtin.quit-app");
/// Hide the application. (mac only)
#[cfg_attr(
not(target_os = "macos"),
deprecated = "HIDE_APPLICATION is only supported on macOS"
)]
pub const HIDE_APPLICATION: Selector = Selector::new("druid-builtin.menu-hide-application");
/// Hide all other applications. (mac only)
#[cfg_attr(
not(target_os = "macos"),
deprecated = "HIDE_OTHERS is only supported on macOS"
)]
pub const HIDE_OTHERS: Selector = Selector::new("druid-builtin.menu-hide-others");
/// The selector for a command to create a new window.
pub(crate) const NEW_WINDOW: Selector<SingleUse<Box<dyn Any>>> =
Selector::new("druid-builtin.new-window");
/// The selector for a command to close a window.
///
/// The command must target a specific window.
/// When calling `submit_command` on a `Widget`s context, passing `None` as target
/// will automatically target the window containing the widget.
pub const CLOSE_WINDOW: Selector = Selector::new("druid-builtin.close-window");
/// Close all windows.
pub const CLOSE_ALL_WINDOWS: Selector = Selector::new("druid-builtin.close-all-windows");
/// The selector for a command to bring a window to the front, and give it focus.
///
/// The command must target a specific window.
/// When calling `submit_command` on a `Widget`s context, passing `None` as target
/// will automatically target the window containing the widget.
pub const SHOW_WINDOW: Selector = Selector::new("druid-builtin.show-window");
/// The selector for a command to hide a specific window
///
/// The command must target a specific window.
/// When calling `submit_command` on a `Widget`s context, passing `None` as target
/// will automatically target the window containing the widget.
pub const HIDE_WINDOW: Selector = Selector::new("druid-builtin.hide-window");
/// Apply the configuration payload to an existing window. The target should be a WindowId.
pub const CONFIGURE_WINDOW: Selector<WindowConfig> =
Selector::new("druid-builtin.configure-window");
/// Display a context (right-click) menu. The payload must be the [`ContextMenu`]
/// object to be displayed.
///
/// [`ContextMenu`]: crate::menu::ContextMenu
pub(crate) const SHOW_CONTEXT_MENU: Selector<SingleUse<Box<dyn Any>>> =
Selector::new("druid-builtin.show-context-menu");
/// This is sent to the window handler to create a new sub window.
pub(crate) const NEW_SUB_WINDOW: Selector<SingleUse<SubWindowDesc>> =
Selector::new("druid-builtin.new-sub-window");
/// This is sent from a WidgetPod to any attached SubWindowHosts when a data update occurs
pub(crate) const SUB_WINDOW_PARENT_TO_HOST: Selector<SubWindowUpdate> =
Selector::new("druid-builtin.parent_to_host");
/// This is sent from a SubWindowHost to its parent WidgetPod after it has processed events,
/// if that processing changed the data value.
pub(crate) const SUB_WINDOW_HOST_TO_PARENT: Selector<Box<dyn Any>> =
Selector::new("druid-builtin.host_to_parent");
/// Show the application preferences.
pub const SHOW_PREFERENCES: Selector = Selector::new("druid-builtin.menu-show-preferences");
/// Show the application's "about" window.
pub const SHOW_ABOUT: Selector = Selector::new("druid-builtin.menu-show-about");
/// Show all applications.
pub const SHOW_ALL: Selector = Selector::new("druid-builtin.menu-show-all");
/// Show the new file dialog.
pub const NEW_FILE: Selector = Selector::new("druid-builtin.menu-file-new");
/// When submitted by the application, a file picker dialog will be shown to the user,
/// and an [`OPEN_FILE`] command will be sent if a path is chosen.
///
/// [`OPEN_FILE`]: constant.OPEN_FILE.html
pub const SHOW_OPEN_PANEL: Selector<FileDialogOptions> =
Selector::new("druid-builtin.menu-file-open");
/// Sent when the user cancels an open file panel.
pub const OPEN_PANEL_CANCELLED: Selector = Selector::new("druid-builtin.open-panel-cancelled");
/// Open a path, must be handled by the application.
///
/// [`FileInfo`]: ../struct.FileInfo.html
pub const OPEN_FILE: Selector<FileInfo> = Selector::new("druid-builtin.open-file-path");
/// Open a set of paths, must be handled by the application.
///
/// [`FileInfo`]: ../struct.FileInfo.html
pub const OPEN_FILES: Selector<Vec<FileInfo>> = Selector::new("druid-builtin.open-files-path");
/// When submitted by the application, the system will show the 'save as' panel,
/// and if a path is selected the system will issue a [`SAVE_FILE`] command
/// with the selected path as the payload.
///
/// [`SAVE_FILE`]: constant.SAVE_FILE.html
pub const SHOW_SAVE_PANEL: Selector<FileDialogOptions> =
Selector::new("druid-builtin.menu-file-save-as");
/// Sent when the user cancels a save file panel.
pub const SAVE_PANEL_CANCELLED: Selector = Selector::new("druid-builtin.save-panel-cancelled");
/// Save the current path.
///
/// The application should save its data, to a path that should be determined by the
/// application. Usually, this will be the most recent path provided by a [`SAVE_FILE_AS`]
/// or [`OPEN_FILE`] command.
pub const SAVE_FILE: Selector<()> = Selector::new("druid-builtin.save-file");
/// Save to a given location.
///
/// This command is emitted by druid whenever a save file dialog successfully completes. The
/// application should save its data to the path proved, and should store the path in order to
/// handle [`SAVE_FILE`] commands in the future.
///
/// The path might be a file or a directory, so always check whether it matches your
/// expectations.
pub const SAVE_FILE_AS: Selector<FileInfo> = Selector::new("druid-builtin.save-file-as");
/// Show the print-setup window.
pub const PRINT_SETUP: Selector = Selector::new("druid-builtin.menu-file-print-setup");
/// Show the print dialog.
pub const PRINT: Selector = Selector::new("druid-builtin.menu-file-print");
/// Show the print preview.
pub const PRINT_PREVIEW: Selector = Selector::new("druid-builtin.menu-file-print");
/// Cut the current selection.
pub const CUT: Selector = Selector::new("druid-builtin.menu-cut");
/// Copy the current selection.
pub const COPY: Selector = Selector::new("druid-builtin.menu-copy");
/// Paste.
pub const PASTE: Selector = Selector::new("druid-builtin.menu-paste");
/// Undo.
pub const UNDO: Selector = Selector::new("druid-builtin.menu-undo");
/// Redo.
pub const REDO: Selector = Selector::new("druid-builtin.menu-redo");
/// Select all.
pub const SELECT_ALL: Selector = Selector::new("druid-builtin.menu-select-all");
/// Text input state has changed, and we need to notify the platform.
pub(crate) const INVALIDATE_IME: Selector<ImeInvalidation> =
Selector::new("druid-builtin.invalidate-ime");
/// Informs this widget that a child wants a specific region to be shown. The payload is the
/// requested region in global coordinates.
///
/// This notification is sent when [`scroll_to_view`] or [`scroll_area_to_view`]
/// is called.
///
/// Widgets which hide their children should always call `ctx.set_handled()` when receiving this to
/// avoid unintended behaviour from widgets further down the tree.
/// If possible the widget should move its children to bring the area into view and then submit
/// a new `SCROLL_TO_VIEW` notification with the same region relative to the new child position.
///
/// When building a new widget using ClipBox, take a look at [`ClipBox::managed`] and
/// [`Viewport::default_scroll_to_view_handling`].
///
/// [`scroll_to_view`]: crate::EventCtx::scroll_to_view()
/// [`scroll_area_to_view`]: crate::EventCtx::scroll_area_to_view()
/// [`ClipBox::managed`]: crate::widget::ClipBox::managed()
/// [`Viewport::default_scroll_to_view_handling`]: crate::widget::Viewport::default_scroll_to_view_handling()
pub const SCROLL_TO_VIEW: Selector<Rect> = Selector::new("druid-builtin.scroll-to");
/// A change that has occurred to text state, and needs to be
/// communicated to the platform.
pub(crate) struct ImeInvalidation {
pub widget: WidgetId,
pub event: crate::shell::text::Event,
}
}
impl Selector<()> {
/// A selector that does nothing.
pub const NOOP: Selector = Selector::new("");
/// Turns this into a command with the specified [`Target`].
///
/// [`Target`]: enum.Target.html
pub fn to(self, target: impl Into<Target>) -> Command {
Command::from(self).to(target.into())
}
}
impl<T> Selector<T> {
/// Create a new `Selector` with the given string.
pub const fn new(s: &'static str) -> Selector<T> {
Selector(s, PhantomData)
}
/// Returns the `SelectorSymbol` identifying this `Selector`.
pub(crate) const fn symbol(self) -> SelectorSymbol {
self.0
}
}
impl<T: Any> Selector<T> {
/// Convenience method for [`Command::new`] with this selector.
///
/// If the payload is `()` there is no need to call this,
/// as `Selector<()>` implements `Into<Command>`.
///
/// By default, the command will have [`Target::Auto`].
/// The [`Selector::to`] method can be used to override this.
pub fn with(self, payload: T) -> Command {
Command::new(self, payload, Target::Auto)
}
}
impl Command {
/// Create a new `Command` with a payload and a [`Target`].
///
/// [`Selector::with`] should be used to create `Command`s more conveniently.
///
/// If you do not need a payload, [`Selector`] implements `Into<Command>`.
pub fn new<T: Any>(selector: Selector<T>, payload: T, target: impl Into<Target>) -> Self {
Command {
symbol: selector.symbol(),
payload: Arc::new(payload),
target: target.into(),
}
}
/// Used to create a `Command` from the types sent via an `ExtEventSink`.
pub(crate) fn from_ext(symbol: SelectorSymbol, payload: Box<dyn Any>, target: Target) -> Self {
Command {
symbol,
payload: payload.into(),
target,
}
.default_to(Target::Global)
}
/// A helper method for creating a `Notification` from a `Command`.
///
/// This is slightly icky; it lets us do `SOME_SELECTOR.with(SOME_PAYLOAD)`
/// (which generates a command) and then privately convert it to a
/// notification.
pub(crate) fn into_notification(self, source: WidgetId) -> Notification {
Notification {
symbol: self.symbol,
payload: self.payload,
source,
route: source,
warn_if_unused: true,
}
}
/// Set the `Command`'s [`Target`].
///
/// [`Command::target`] can be used to get the current [`Target`].
///
/// [`Command::target`]: #method.target
/// [`Target`]: enum.Target.html
pub fn to(mut self, target: impl Into<Target>) -> Self {
self.target = target.into();
self
}
/// Set the correct default target when target is `Auto`.
pub(crate) fn default_to(mut self, target: Target) -> Self {
self.target.default(target);
self
}
/// Returns the `Command`'s [`Target`].
///
/// [`Command::to`] can be used to change the [`Target`].
///
/// [`Command::to`]: #method.to
/// [`Target`]: enum.Target.html
pub fn target(&self) -> Target {
self.target
}
/// Returns `true` if `self` matches this `selector`.
pub fn is<T>(&self, selector: Selector<T>) -> bool {
self.symbol == selector.symbol()
}
/// Returns `Some(&T)` (this `Command`'s payload) if the selector matches.
///
/// Returns `None` when `self.is(selector) == false`.
///
/// Alternatively you can check the selector with [`is`] and then use [`get_unchecked`].
///
/// # Panics
///
/// Panics when the payload has a different type, than what the selector is supposed to carry.
/// This can happen when two selectors with different types but the same key are used.
///
/// [`is`]: #method.is
/// [`get_unchecked`]: #method.get_unchecked
pub fn get<T: Any>(&self, selector: Selector<T>) -> Option<&T> {
if self.symbol == selector.symbol() {
Some(self.payload.downcast_ref().unwrap_or_else(|| {
panic!(
"The selector \"{}\" exists twice with different types. See druid::Command::get for more information",
selector.symbol()
);
}))
} else {
None
}
}
/// Returns a reference to this `Command`'s payload.
///
/// If the selector has already been checked with [`is`], then `get_unchecked` can be used safely.
/// Otherwise you should use [`get`] instead.
///
/// # Panics
///
/// Panics when `self.is(selector) == false`.
///
/// Panics when the payload has a different type, than what the selector is supposed to carry.
/// This can happen when two selectors with different types but the same key are used.
///
/// [`is`]: #method.is
/// [`get`]: #method.get
pub fn get_unchecked<T: Any>(&self, selector: Selector<T>) -> &T {
self.get(selector).unwrap_or_else(|| {
panic!(
"Expected selector \"{}\" but the command was \"{}\".",
selector.symbol(),
self.symbol
)
})
}
}
impl Notification {
/// Returns `true` if `self` matches this [`Selector`].
pub fn is<T>(&self, selector: Selector<T>) -> bool {
self.symbol == selector.symbol()
}
/// Returns the payload for this [`Selector`], if the selector matches.
///
/// # Panics
///
/// Panics when the payload has a different type, than what the selector
/// is supposed to carry. This can happen when two selectors with different
/// types but the same key are used.
///
/// [`is`]: #method.is
pub fn get<T: Any>(&self, selector: Selector<T>) -> Option<&T> {
if self.symbol == selector.symbol() {
Some(self.payload.downcast_ref().unwrap_or_else(|| {
panic!(
"The selector \"{}\" exists twice with different types. \
See druid::Command::get for more information",
selector.symbol()
);
}))
} else {
None
}
}
/// The [`WidgetId`] of the [`Widget`] that sent this [`Notification`].
///
/// [`Widget`]: crate::Widget
pub fn source(&self) -> WidgetId {
self.source
}
/// Builder-style method to set `warn_if_unused`.
///
/// The default is `true`.
pub fn warn_if_unused(mut self, warn_if_unused: bool) -> Self {
self.warn_if_unused = warn_if_unused;
self
}
/// Returns whether there should be a warning when no widget handles this notification.
pub fn warn_if_unused_set(&self) -> bool {
self.warn_if_unused
}
/// Change the route id
pub(crate) fn with_route(mut self, widget_id: WidgetId) -> Self {
self.route = widget_id;
self
}
/// The [`WidgetId`] of the last [`Widget`] that this [`Notification`] was passed through.
///
/// # Example
///
/// ```ignore
/// fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut (), env: &Env) {
/// if let Event::Notification(notification) = event {
/// if notification.route() == self.widget1.id() {
/// // the notification came from inside of widget1
/// }
/// if notification.route() == self.widget2.id() {
/// // the notification came from inside of widget2
/// }
/// }
/// }
/// ```
///
/// [`Widget`]: crate::Widget
pub fn route(&self) -> WidgetId {
self.route
}
}
impl<T: Any> SingleUse<T> {
/// Create a new single-use payload.
pub fn new(data: T) -> Self {
SingleUse(Mutex::new(Some(data)))
}
/// Takes the value, leaving a None in its place.
pub fn take(&self) -> Option<T> {
self.0.lock().unwrap().take()
}
}
impl From<Selector> for Command {
fn from(selector: Selector) -> Command {
Command {
symbol: selector.symbol(),
payload: Arc::new(()),
target: Target::Auto,
}
}
}
impl<T> std::fmt::Display for Selector<T> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "Selector(\"{}\", {})", self.0, any::type_name::<T>())
}
}
// This has do be done explicitly, to avoid the Copy bound on `T`.
// See https://doc.rust-lang.org/std/marker/trait.Copy.html#how-can-i-implement-copy .
impl<T> Copy for Selector<T> {}
impl<T> Clone for Selector<T> {
fn clone(&self) -> Self {
*self
}
}
impl Target {
/// If `self` is `Auto` it will be replaced with `target`.
pub(crate) fn default(&mut self, target: Target) {
if self == &Target::Auto {
*self = target;
}
}
}
impl From<WindowId> for Target {
fn from(id: WindowId) -> Target {
Target::Window(id)
}
}
impl From<WidgetId> for Target {
fn from(id: WidgetId) -> Target {
Target::Widget(id)
}
}
impl From<WindowId> for Option<Target> {
fn from(id: WindowId) -> Self {
Some(Target::Window(id))
}
}
impl From<WidgetId> for Option<Target> {
fn from(id: WidgetId) -> Self {
Some(Target::Widget(id))
}
}
impl std::fmt::Debug for Notification {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(
f,
"Notification: Selector {} from {:?}",
self.symbol, self.source
)
}
}
#[cfg(test)]
mod tests {
use super::*;
use test_log::test;
#[test]
fn get_payload() {
let sel = Selector::new("my-selector");
let payload = vec![0, 1, 2];
let command = sel.with(payload);
assert_eq!(command.get(sel), Some(&vec![0, 1, 2]));
}
#[test]
fn selector_is_send_and_sync() {
fn assert_send_sync<T: Send + Sync>() {}
assert_send_sync::<Selector>();
}
}