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Add the ability to pass a prebuilt canvas (#1394)

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This allows Winit to take control of existing canvas elements in the
DOM, which is useful for web applications with other content in the
page.
This commit is contained in:
Ryan G 2020-01-15 21:20:14 -05:00 • committed by GitHub
parent 9daa0738a9
commit 1fe4a7a4ea
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7 changed files with 69 additions and 23 deletions
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17
src/platform_impl/web/stdweb/canvas.rs
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@ -2,7 +2,7 @@ use super::event;
use crate::dpi::{LogicalPosition, PhysicalPosition, PhysicalSize};
use crate::error::OsError as RootOE;
use crate::event::{ModifiersState, MouseButton, MouseScrollDelta, ScanCode, VirtualKeyCode};
use crate::platform_impl::OsError;
use crate::platform_impl::{OsError, PlatformSpecificWindowBuilderAttributes};
use std::cell::RefCell;
use std::rc::Rc;
@ -43,12 +43,15 @@ impl Drop for Canvas {
}
impl Canvas {
pub fn create() -> Result<Self, RootOE> {
let canvas: CanvasElement = document()
.create_element("canvas")
.map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?
.try_into()
.map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?;
pub fn create(attr: PlatformSpecificWindowBuilderAttributes) -> Result<Self, RootOE> {
let canvas = match attr.canvas {
Some(canvas) => canvas,
None => document()
.create_element("canvas")
.map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?
.try_into()
.map_err(|_| os_error!(OsError("Failed to create canvas element".to_owned())))?,
};
// A tabindex is needed in order to capture local keyboard events.
// A "0" value means that the element should be focusable in