Struct show_image::ContextProxy [−][src]
Proxy object to interact with the global context from a user thread.
You should not use proxy objects from withing the global context thread. The proxy objects often wait for the global context to perform some action. Doing so from within the global context thread would cause a deadlock.
Implementations
impl ContextProxy
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pub fn add_event_handler<F>(&self, handler: F) where
F: FnMut(&mut ContextHandle<'_>, &mut Event, &mut EventHandlerControlFlow) + Send + 'static,
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F: FnMut(&mut ContextHandle<'_>, &mut Event, &mut EventHandlerControlFlow) + Send + 'static,
Add a global event handler to the context.
Events that are already queued with the event loop will not be passed to the handler.
This function uses Self::run_function_wait
internally, so it blocks until the event handler is added.
To avoid blocking, you can use Self::run_function
to post a lambda that adds an error handler instead.
Panics
This function will panic if called from within the context thread.
pub fn add_window_event_handler<F>(
&self,
window_id: WindowId,
handler: F
) -> Result<(), InvalidWindowId> where
F: FnMut(&mut WindowHandle<'_>, &mut WindowEvent, &mut EventHandlerControlFlow) + Send + 'static,
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&self,
window_id: WindowId,
handler: F
) -> Result<(), InvalidWindowId> where
F: FnMut(&mut WindowHandle<'_>, &mut WindowEvent, &mut EventHandlerControlFlow) + Send + 'static,
Add an event handler for a specific window.
Events that are already queued with the event loop will not be passed to the handler.
This function uses Self::run_function_wait
internally, so it blocks until the event handler is added.
To avoid blocking, you can use Self::run_function
to post a lambda that adds an error handler instead.
Panics
This function will panic if called from within the context thread.
pub fn run_function<F>(&self, function: F) where
F: 'static + FnOnce(&mut ContextHandle<'_>) + Send,
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F: 'static + FnOnce(&mut ContextHandle<'_>) + Send,
Post a function for execution in the context thread without waiting for it to execute.
This function returns immediately, without waiting for the posted function to start or complete.
If you want to get a return value back from the function, use Self::run_function_wait
instead.
Note:
You should not post functions to the context thread that block for a long time.
Doing so will block the event loop and will make the windows unresponsive until the event loop can continue.
Consider using Self::run_background_task
for long blocking tasks instead.
Panics
This function will panic if called from within the context thread.
pub fn run_function_wait<F, T>(&self, function: F) -> T where
F: FnOnce(&mut ContextHandle<'_>) -> T + Send + 'static,
T: Send + 'static,
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F: FnOnce(&mut ContextHandle<'_>) -> T + Send + 'static,
T: Send + 'static,
Post a function for execution in the context thread and wait for the return value.
If you do not need a return value from the posted function,
you can use Self::run_function
to avoid blocking the calling thread until it completes.
Note:
You should not post functions to the context thread that block for a long time.
Doing so will block the event loop and will make the windows unresponsive until the event loop can continue.
Consider using Self::run_background_task
for long blocking tasks instead.
Panics
This function will panic if called from within the context thread.
pub fn run_background_task<F>(&self, task: F) where
F: FnOnce() + Send + 'static,
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F: FnOnce() + Send + 'static,
Run a task in a background thread and register it with the context.
The task will be executed in a different thread than the context. Currently, each task is spawned in a separate thread. In the future, tasks may be run in a dedicated thread pool.
The background task will be joined before the process is terminated when you use Self::exit()
or one of the other exit functions of this crate.
pub fn event_channel(&self) -> Receiver<Event>
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Create a channel that receives events from the context.
To close the channel, simply drop de receiver.
Warning: The created channel blocks when you request an event until one is available. You should never use the receiver from within an event handler or a function posted to the global context thread. Doing so would cause a deadlock.
Panics
This function will panic if called from within the context thread.
pub fn window_event_channel(
&self,
window_id: WindowId
) -> Result<Receiver<WindowEvent>, InvalidWindowId>
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&self,
window_id: WindowId
) -> Result<Receiver<WindowEvent>, InvalidWindowId>
Create a channel that receives events from a window.
To close the channel, simply drop de receiver. The channel is closed automatically when the window is destroyed.
Warning: The created channel blocks when you request an event until one is available. You should never use the receiver from within an event handler or a function posted to the global context thread. Doing so would cause a deadlock.
Panics
This function will panic if called from within the context thread.
pub fn exit(&self, code: i32) -> !
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Join all background tasks and then exit the process.
If you use std::process::exit
, running background tasks may be killed.
To ensure no data loss occurs, you should use this function instead.
Background tasks are spawned when an image is saved through the built-in Ctrl+S or Ctrl+Shift+S shortcut, or by user code.
Panics
This function will panic if called from within the context thread.
Trait Implementations
impl Clone for ContextProxy
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fn clone(&self) -> ContextProxy
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pub fn clone_from(&mut self, source: &Self)
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Auto Trait Implementations
impl !RefUnwindSafe for ContextProxy
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impl Send for ContextProxy
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impl !Sync for ContextProxy
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impl Unpin for ContextProxy
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impl !UnwindSafe for ContextProxy
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T> Instrument for T
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pub fn instrument(self, span: Span) -> Instrumented<Self>
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pub fn in_current_span(self) -> Instrumented<Self>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> Pointable for T
pub const ALIGN: usize
type Init = T
The type for initializers.
pub unsafe fn init(init: <T as Pointable>::Init) -> usize
pub unsafe fn deref<'a>(ptr: usize) -> &'a T
pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T
pub unsafe fn drop(ptr: usize)
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,