mirror of
https://github.com/slint-ui/slint.git
synced 2025-10-02 14:51:15 +00:00
67a2f0ce3f
This includes the cache of decoded images, the HTMLImage element support and the SVG rendering adapter. The objective is that Image holds an ImageInner, which is not a path anymore that the backend has to process, but instead always either decoded image data, a pointer to a static texture or an SVG tree that can be rendered to the desired size.
104 lines
3.5 KiB
Rust
104 lines
3.5 KiB
Rust
// Copyright © SixtyFPS GmbH <info@slint-ui.com>
|
|
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
|
|
|
|
/*!
|
|
The backend is the abstraction for crates that need to do the actual drawing and event loop
|
|
*/
|
|
|
|
use alloc::boxed::Box;
|
|
use alloc::rc::Rc;
|
|
use alloc::string::String;
|
|
|
|
use crate::window::Window;
|
|
|
|
#[cfg(feature = "std")]
|
|
use once_cell::sync::OnceCell;
|
|
|
|
#[cfg(all(not(feature = "std"), feature = "unsafe_single_core"))]
|
|
use crate::unsafe_single_core::OnceCell;
|
|
|
|
#[derive(Copy, Clone)]
|
|
/// Behavior describing how the event loop should terminate.
|
|
pub enum EventLoopQuitBehavior {
|
|
/// Terminate the event loop when the last window was closed.
|
|
QuitOnLastWindowClosed,
|
|
/// Keep the event loop running until [`Backend::quit_event_loop()`] is called.
|
|
QuitOnlyExplicitly,
|
|
}
|
|
|
|
/// Interface implemented by back-ends
|
|
pub trait Backend: Send + Sync {
|
|
/// Instantiate a window for a component.
|
|
/// FIXME: should return a Box<dyn PlatformWindow>
|
|
fn create_window(&'static self) -> Rc<Window>;
|
|
|
|
/// Spins an event loop and renders the visible windows.
|
|
fn run_event_loop(&'static self, behavior: EventLoopQuitBehavior);
|
|
|
|
/// Exits the event loop.
|
|
fn quit_event_loop(&'static self);
|
|
|
|
#[cfg(feature = "std")] // FIXME: just because of the Error
|
|
/// This function can be used to register a custom TrueType font with Slint,
|
|
/// for use with the `font-family` property. The provided slice must be a valid TrueType
|
|
/// font.
|
|
fn register_font_from_memory(
|
|
&'static self,
|
|
data: &'static [u8],
|
|
) -> Result<(), Box<dyn std::error::Error>>;
|
|
|
|
#[cfg(feature = "std")]
|
|
/// This function can be used to register a custom TrueType font with Slint,
|
|
/// for use with the `font-family` property. The provided path must refer to a valid TrueType
|
|
/// font.
|
|
fn register_font_from_path(
|
|
&'static self,
|
|
path: &std::path::Path,
|
|
) -> Result<(), Box<dyn std::error::Error>>;
|
|
|
|
fn register_bitmap_font(&'static self, _font_data: &'static crate::graphics::BitmapFont) {
|
|
unimplemented!()
|
|
}
|
|
|
|
fn set_clipboard_text(&'static self, text: String);
|
|
fn clipboard_text(&'static self) -> Option<String>;
|
|
|
|
/// Send an user event to from another thread that should be run in the GUI event loop
|
|
fn post_event(&'static self, event: Box<dyn FnOnce() + Send>);
|
|
|
|
fn duration_since_start(&'static self) -> core::time::Duration {
|
|
#[cfg(feature = "std")]
|
|
{
|
|
let the_beginning = *INITIAL_INSTANT.get_or_init(instant::Instant::now);
|
|
instant::Instant::now() - the_beginning
|
|
}
|
|
#[cfg(not(feature = "std"))]
|
|
core::time::Duration::ZERO
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "std")]
|
|
static INITIAL_INSTANT: once_cell::sync::OnceCell<instant::Instant> =
|
|
once_cell::sync::OnceCell::new();
|
|
|
|
#[cfg(feature = "std")]
|
|
impl std::convert::From<crate::animations::Instant> for instant::Instant {
|
|
fn from(our_instant: crate::animations::Instant) -> Self {
|
|
let the_beginning = *INITIAL_INSTANT.get_or_init(instant::Instant::now);
|
|
the_beginning + core::time::Duration::from_millis(our_instant.0)
|
|
}
|
|
}
|
|
|
|
static PRIVATE_BACKEND_INSTANCE: OnceCell<Box<dyn Backend + 'static>> = OnceCell::new();
|
|
|
|
pub fn instance() -> Option<&'static dyn Backend> {
|
|
use core::ops::Deref;
|
|
PRIVATE_BACKEND_INSTANCE.get().map(|backend_box| backend_box.deref())
|
|
}
|
|
|
|
pub fn instance_or_init(
|
|
factory_fn: impl FnOnce() -> Box<dyn Backend + 'static>,
|
|
) -> &'static dyn Backend {
|
|
use core::ops::Deref;
|
|
PRIVATE_BACKEND_INSTANCE.get_or_init(factory_fn).deref()
|
|
}
|