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graphview: implement link on mouse pointer

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Draw a dash line following the mouse pointer
when an available port has been clicked.
This commit is contained in:
Stéphane Cerveau 2022-01-26 14:21:17 +01:00
parent cf8c8ab585
commit 620f6bf699
1 changed files with 128 additions and 58 deletions
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186
src/graphmanager/graphview.rs
View file

@ -69,6 +69,7 @@ mod imp {
pub(super) current_port_id: Cell<u32>,
pub(super) current_link_id: Cell<u32>,
pub(super) port_selected: RefCell<Option<Port>>,
pub(super) mouse_position: Cell<(f64, f64)>,
}
#[glib::object_subclass]
@ -225,12 +226,29 @@ mod imp {
info!("add selected port id {}", port_clicked.id());
widget.set_selected_port(Some(&port_clicked));
}
} else {
// click to a linked port
widget.set_selected_port(None);
}
} else {
// Click to something else than a port
widget.set_selected_port(None);
}
}
}
}));
obj.add_controller(&gesture);
let event_motion = gtk::EventControllerMotion::new();
event_motion.connect_motion(glib::clone!(@weak obj => move |_e, x, y| {
let graphview = obj;
if graphview.selected_port().is_some() {
graphview.set_mouse_position(x,y);
graphview.queue_draw();
}
}));
obj.add_controller(&event_motion);
}
fn dispose(&self, _obj: &Self::Type) {
@ -300,80 +318,65 @@ mod imp {
}
impl WidgetImpl for GraphView {
fn snapshot(&self, widget: &Self::Type, snapshot: &gtk::Snapshot) {
fn snapshot(&self, _widget: &Self::Type, snapshot: &gtk::Snapshot) {
/* FIXME: A lot of hardcoded values in here.
Try to use relative units (em) and colours from the theme as much as possible. */
let alloc = widget.allocation();
// Draw all children
self.nodes
.borrow()
.values()
.for_each(|node| self.instance().snapshot_child(node, snapshot));
// Draw all links
let link_cr = snapshot.append_cairo(&graphene::Rect::new(
0.0,
0.0,
alloc.width() as f32,
alloc.height() as f32,
));
for link in self.links.borrow().values() {
if let Some((from_x, from_y, to_x, to_y)) = self.link_coordinates(link) {
//trace!("from_x: {} from_y: {} to_x: {} to_y: {}", from_x, from_y, to_x, to_y);
link_cr.set_line_width(link.thickness as f64);
// Use dashed line for inactive links, full line otherwise.
if link.active {
link_cr.set_dash(&[], 0.0);
} else {
link_cr.set_dash(&[10.0, 5.0], 0.0);
}
if link.selected() {
link_cr.set_source_rgb(1.0, 0.18, 0.18);
} else {
link_cr.set_source_rgb(0.0, 0.0, 0.0);
}
link_cr.move_to(from_x, from_y);
link_cr.line_to(to_x, to_y);
link_cr.set_line_width(2.0);
if let Err(e) = link_cr.stroke() {
warn!("Failed to draw graphview links: {}", e);
};
self.draw_link(
snapshot,
link.active,
link.selected(),
link.thickness as f64,
&graphene::Point::new(from_x as f32, from_y as f32),
&graphene::Point::new(to_x as f32, to_y as f32),
);
} else {
warn!("Could not get allocation of ports of link: {:?}", link);
warn!("Could not get link coordinates: {:?}", link);
}
}
if self.port_selected.borrow().is_some() {
let port = self.port_selected.borrow();
let port = port.as_ref().unwrap();
let node = port
.ancestor(Node::static_type())
.expect("Unable to reach parent")
.dynamic_cast::<Node>()
.expect("Unable to cast to Node");
let (from_x, from_y) = self.link_from_coordinates(node.id(), port.id());
let (to_x, to_y) = self.mouse_position.get();
self.draw_link(
snapshot,
false,
false,
2.0,
&graphene::Point::new(from_x as f32, from_y as f32),
&graphene::Point::new(to_x as f32, to_y as f32),
);
}
}
}
impl GraphView {
/// Retrieves coordinates for the drawn link to start at and to end at.
///
/// # Returns
/// `Some((from_x, from_y, to_x, to_y))` if all objects the links refers to exist as widgets.
pub fn link_coordinates(&self, link: &Link) -> Option<(f64, f64, f64, f64)> {
fn link_from_coordinates(&self, node_from: u32, port_from: u32) -> (f64, f64) {
let nodes = self.nodes.borrow();
let from_node = nodes
.get(&link.node_from)
.unwrap_or_else(|| panic!("Unable to get node from {}", link.node_from));
.get(&node_from)
.unwrap_or_else(|| panic!("Unable to get node from {}", node_from));
let from_port = from_node
.port(link.port_from)
.unwrap_or_else(|| panic!("Unable to get port from {}", link.port_from));
let to_node = nodes
.get(&link.node_to)
.unwrap_or_else(|| panic!("Unable to get node to {}", link.node_to));
let to_port = to_node
.port(link.port_to)
.unwrap_or_else(|| panic!("Unable to get port to {}", link.port_to));
let (mut fx, mut fy, fw, fh) = (
.port(port_from)
.unwrap_or_else(|| panic!("Unable to get port from {}", port_from));
let (mut from_x, mut from_y, fw, fh) = (
from_port.allocation().x(),
from_port.allocation().y(),
from_port.allocation().width(),
@ -382,11 +385,23 @@ mod imp {
let (fnx, fny) = (from_node.allocation().x(), from_node.allocation().y());
if let Some((port_x, port_y)) = from_port.translate_coordinates(from_node, 0.0, 0.0) {
fx = fnx + fw + port_x as i32;
fy = fny + (fh / 2) + port_y as i32;
from_x = fnx + fw + port_x as i32;
from_y = fny + (fh / 2) + port_y as i32;
}
let (mut tx, mut ty, th) = (
(from_x as f64, from_y as f64)
}
fn link_to_coordinates(&self, node_to: u32, port_to: u32) -> (f64, f64) {
let nodes = self.nodes.borrow();
let to_node = nodes
.get(&node_to)
.unwrap_or_else(|| panic!("Unable to get node to {}", node_to));
let to_port = to_node
.port(port_to)
.unwrap_or_else(|| panic!("Unable to get port to {}", port_to));
let (mut to_x, mut to_y, th) = (
to_port.allocation().x(),
to_port.allocation().y(),
to_port.allocation().height(),
@ -395,11 +410,59 @@ mod imp {
let (tnx, tny) = (to_node.allocation().x(), to_node.allocation().y());
if let Some((port_x, port_y)) = to_port.translate_coordinates(to_node, 0.0, 0.0) {
tx += tnx + port_x as i32;
ty = tny + (th / 2) + port_y as i32;
to_x += tnx + port_x as i32;
to_y = tny + (th / 2) + port_y as i32;
}
//trace!("{} {} -> {} {}", fx, fy, tx, ty);
Some((fx.into(), fy.into(), tx.into(), ty.into()))
(to_x.into(), to_y.into())
}
/// Retrieves coordinates for the drawn link to start at and to end at.
///
/// # Returns
/// `Some((from_x, from_y, to_x, to_y))` if all objects the links refers to exist as widgets.
pub fn link_coordinates(&self, link: &Link) -> Option<(f64, f64, f64, f64)> {
let (from_x, from_y) = self.link_from_coordinates(link.node_from, link.port_from);
let (to_x, to_y) = self.link_to_coordinates(link.node_to, link.port_to);
Some((from_x, from_y, to_x, to_y))
}
fn draw_link(
&self,
snapshot: &gtk::Snapshot,
active: bool,
selected: bool,
thickness: f64,
point_from: &graphene::Point,
point_to: &graphene::Point,
) {
let alloc = self.instance().allocation();
let link_cr = snapshot.append_cairo(&graphene::Rect::new(
0.0,
0.0,
alloc.width() as f32,
alloc.height() as f32,
));
link_cr.set_line_width(thickness);
// Use dashed line for inactive links, full line otherwise.
if active {
link_cr.set_dash(&[], 0.0);
} else {
link_cr.set_dash(&[10.0, 5.0], 0.0);
}
if selected {
link_cr.set_source_rgb(1.0, 0.18, 0.18);
} else {
link_cr.set_source_rgb(0.0, 0.0, 0.0);
}
link_cr.move_to(point_from.x() as f64, point_from.y() as f64);
link_cr.line_to(point_to.x() as f64, point_to.y() as f64);
link_cr.set_line_width(2.0);
if let Err(e) = link_cr.stroke() {
warn!("Failed to draw graphview links: {}", e);
};
}
}
}
@ -1128,7 +1191,9 @@ impl GraphView {
}
fn set_selected_port(&self, port: Option<&Port>) {
self.unselect_all();
if port.is_some() {
self.unselect_all();
}
let private = imp::GraphView::from_instance(self);
*private.port_selected.borrow_mut() = port.cloned();
}
@ -1138,6 +1203,11 @@ impl GraphView {
private.port_selected.borrow_mut()
}
fn set_mouse_position(&self, x: f64, y: f64) {
let private = imp::GraphView::from_instance(self);
private.mouse_position.set((x, y));
}
fn ports_compatible(&self, to_port: &Port) -> bool {
let current_port = self.selected_port().to_owned();
if let Some(from_port) = current_port {