Struct relm4::abstractions::drawing::DrawHandler
source · pub struct DrawHandler { /* private fields */ }
Expand description
Manager for drawing operations.
Implementations§
source§impl DrawHandler
impl DrawHandler
sourcepub fn new() -> Self
pub fn new() -> Self
Create a new DrawHandler
.
Examples found in repository?
examples/drawing.rs (line 123)
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fn init(
_: Self::Init,
root: Self::Root,
sender: ComponentSender<Self>,
) -> ComponentParts<Self> {
let model = App {
width: 100.0,
height: 100.0,
points: Vec::new(),
handler: DrawHandler::new(),
};
let area = model.handler.drawing_area();
let widgets = view_output!();
sender.command(|out, shutdown| {
shutdown
.register(async move {
loop {
tokio::time::sleep(Duration::from_millis(20)).await;
out.send(UpdatePointsMsg).unwrap();
}
})
.drop_on_shutdown()
});
ComponentParts { model, widgets }
}
sourcepub fn new_with_drawing_area(drawing_area: DrawingArea) -> Self
pub fn new_with_drawing_area(drawing_area: DrawingArea) -> Self
Create a new DrawHandler
with an existing gtk::DrawingArea
.
sourcepub fn get_context(&mut self) -> DrawContext
pub fn get_context(&mut self) -> DrawContext
Get the drawing context to draw on a gtk::DrawingArea
.
If the size of the gtk::DrawingArea
changed, the contents of the
surface will be replaced by a new, empty surface.
Examples found in repository?
examples/drawing.rs (line 70)
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fn update(&mut self, msg: Msg, _sender: ComponentSender<Self>, _root: &Self::Root) {
let cx = self.handler.get_context();
match msg {
Msg::AddPoint((x, y)) => {
self.points.push(Point::new(x, y));
}
Msg::Resize => {
self.width = self.handler.width() as f64;
self.height = self.handler.height() as f64;
}
Msg::Reset => {
cx.set_operator(Operator::Clear);
cx.set_source_rgba(0.0, 0.0, 0.0, 0.0);
cx.paint().expect("Couldn't fill context");
}
}
draw(&cx, &self.points);
}
fn update_cmd(&mut self, _: UpdatePointsMsg, _: ComponentSender<Self>, _root: &Self::Root) {
for point in &mut self.points {
let Point { x, y, .. } = point;
if *x < 0.0 {
point.xs = point.xs.abs();
} else if *x > self.width {
point.xs = -point.xs.abs();
}
*x = x.clamp(0.0, self.width);
*x += point.xs;
if *y < 0.0 {
point.ys = point.ys.abs();
} else if *y > self.height {
point.ys = -point.ys.abs();
}
*y = y.clamp(0.0, self.height);
*y += point.ys;
}
let cx = self.handler.get_context();
draw(&cx, &self.points);
}
sourcepub fn size(&self) -> (i32, i32)
pub fn size(&self) -> (i32, i32)
Get the width and height of the DrawHandler
in pixels.
sourcepub fn height(&self) -> i32
pub fn height(&self) -> i32
Get the height of the DrawHandler
in pixels.
Examples found in repository?
examples/drawing.rs (line 78)
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fn update(&mut self, msg: Msg, _sender: ComponentSender<Self>, _root: &Self::Root) {
let cx = self.handler.get_context();
match msg {
Msg::AddPoint((x, y)) => {
self.points.push(Point::new(x, y));
}
Msg::Resize => {
self.width = self.handler.width() as f64;
self.height = self.handler.height() as f64;
}
Msg::Reset => {
cx.set_operator(Operator::Clear);
cx.set_source_rgba(0.0, 0.0, 0.0, 0.0);
cx.paint().expect("Couldn't fill context");
}
}
draw(&cx, &self.points);
}
sourcepub fn width(&self) -> i32
pub fn width(&self) -> i32
Get the width of the DrawHandler
in pixels.
Examples found in repository?
examples/drawing.rs (line 77)
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fn update(&mut self, msg: Msg, _sender: ComponentSender<Self>, _root: &Self::Root) {
let cx = self.handler.get_context();
match msg {
Msg::AddPoint((x, y)) => {
self.points.push(Point::new(x, y));
}
Msg::Resize => {
self.width = self.handler.width() as f64;
self.height = self.handler.height() as f64;
}
Msg::Reset => {
cx.set_operator(Operator::Clear);
cx.set_source_rgba(0.0, 0.0, 0.0, 0.0);
cx.paint().expect("Couldn't fill context");
}
}
draw(&cx, &self.points);
}
sourcepub fn surface_height(&self) -> i32
pub fn surface_height(&self) -> i32
Get the height of the inner ImageSurface
.
NOTE: Depending on the monitor scaling this is not necessarily the height in pixels.
sourcepub fn surface_width(&self) -> i32
pub fn surface_width(&self) -> i32
Get the width of the inner ImageSurface
.
NOTE: Depending on the monitor scaling this is not necessarily the width in pixels.
sourcepub fn drawing_area(&self) -> &DrawingArea
pub fn drawing_area(&self) -> &DrawingArea
Get the gtk::DrawingArea
of the DrawHandler
.
Examples found in repository?
examples/drawing.rs (line 126)
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fn init(
_: Self::Init,
root: Self::Root,
sender: ComponentSender<Self>,
) -> ComponentParts<Self> {
let model = App {
width: 100.0,
height: 100.0,
points: Vec::new(),
handler: DrawHandler::new(),
};
let area = model.handler.drawing_area();
let widgets = view_output!();
sender.command(|out, shutdown| {
shutdown
.register(async move {
loop {
tokio::time::sleep(Duration::from_millis(20)).await;
out.send(UpdatePointsMsg).unwrap();
}
})
.drop_on_shutdown()
});
ComponentParts { model, widgets }
}
Trait Implementations§
source§impl Debug for DrawHandler
impl Debug for DrawHandler
Auto Trait Implementations§
impl Freeze for DrawHandler
impl !RefUnwindSafe for DrawHandler
impl !Send for DrawHandler
impl !Sync for DrawHandler
impl Unpin for DrawHandler
impl !UnwindSafe for DrawHandler
Blanket Implementations§
source§impl<C> AsyncPosition<()> for C
impl<C> AsyncPosition<()> for C
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more