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This commit is contained in:
Antoine Beyeler
2024-01-27 12:38:18 +01:00
parent c3fdd35625
commit 9689d71609
3 changed files with 38 additions and 61 deletions
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95
examples/hierachical_list_drag_and_drop/src/app.rs
View File

@@ -1,4 +1,7 @@
use std::collections::{HashMap, HashSet};
//! This demo is a stripped-down version of the drag-and-drop implementation in the
//! [rerun viewer](https://github.com/rerun-io/rerun).
use std::collections::HashMap;
use eframe::{egui, egui::NumExt as _};
@@ -30,12 +33,6 @@ enum Item {
#[derive(Debug)]
enum Command {
/// Set the selection to the given item.
SetSelection(ItemId),
/// Toggle the selected state of the given item.
ToggleSelected(ItemId),
/// Move the currently dragged item to the given container and position.
MoveItem {
moved_item_id: ItemId,
@@ -43,7 +40,7 @@ enum Command {
target_position_index: usize,
},
/// Specify the currently identifed target container to be highlighted.
/// Specify the currently identified target container to be highlighted.
HighlightTargetContainer(ItemId),
}
@@ -54,9 +51,6 @@ pub struct HierarchicalDragAndDrop {
/// Id of the root item (not displayed in the UI)
root_id: ItemId,
/// Set of all selected items
selected_items: HashSet<ItemId>,
/// If a drag is ongoing, this is the id of the destination container (if any was identified)
///
/// This is used to highlight the target container.
@@ -79,7 +73,6 @@ impl Default for HierarchicalDragAndDrop {
let mut res = Self {
items: std::iter::once((root_id, root_item)).collect(),
root_id,
selected_items: HashSet::new(),
target_container: None,
command_receiver,
command_sender,
@@ -227,10 +220,6 @@ impl HierarchicalDragAndDrop {
}
}
fn selected(&self, id: ItemId) -> bool {
self.selected_items.contains(&id)
}
fn send_command(&self, command: Command) {
// The only way this can fail is if the receiver has been dropped.
self.command_sender.send(command).ok();
@@ -252,17 +241,6 @@ impl HierarchicalDragAndDrop {
while let Ok(command) = self.command_receiver.try_recv() {
//println!("Received command: {command:?}");
match command {
Command::SetSelection(item_id) => {
self.selected_items.clear();
self.selected_items.insert(item_id);
}
Command::ToggleSelected(item_id) => {
if self.selected_items.contains(&item_id) {
self.selected_items.remove(&item_id);
} else {
self.selected_items.insert(item_id);
}
}
Command::MoveItem {
moved_item_id,
target_container_id,
@@ -276,7 +254,7 @@ impl HierarchicalDragAndDrop {
}
fn container_ui(&self, ui: &mut egui::Ui, item_id: ItemId, children: &Vec<ItemId>) {
let (_, header_resp, body_resp) =
let (response, head_response, body_resp) =
egui::collapsing_header::CollapsingState::load_with_default_open(
ui.ctx(),
item_id.into(),
@@ -293,11 +271,11 @@ impl HierarchicalDragAndDrop {
self.container_children_ui(ui, children);
});
self.handle_interaction(
self.handle_drag_and_drop_interaction(
ui,
item_id,
true,
&header_resp.inner,
&head_response.inner.union(response),
body_resp.as_ref().map(|r| &r.response),
);
}
@@ -322,16 +300,11 @@ impl HierarchicalDragAndDrop {
.selectable(false)
.sense(egui::Sense::drag()),
);
// let response = re_ui
// .list_item(label)
// .selected(self.selected(item_id))
// .draggable(true)
// .show(ui);
self.handle_interaction(ui, item_id, false, &response, None);
self.handle_drag_and_drop_interaction(ui, item_id, false, &response, None);
}
fn handle_interaction(
fn handle_drag_and_drop_interaction(
&self,
ui: &egui::Ui,
item_id: ItemId,
@@ -340,31 +313,15 @@ impl HierarchicalDragAndDrop {
body_response: Option<&egui::Response>,
) {
//
// basic selection management
//
if response.clicked() {
if ui.input(|i| i.modifiers.command) {
self.send_command(Command::ToggleSelected(item_id));
} else {
self.send_command(Command::SetSelection(item_id));
}
}
//
// handle drag
// handle start of drag
//
if response.drag_started() {
// Here, we support dragging a single item at a time, so we set the selection to the dragged item
// if/when we're dragging it proper.
self.send_command(Command::SetSelection(item_id));
egui::DragAndDrop::set_payload(ui.ctx(), item_id);
}
//
// handle drop
// handle candidate drop
//
// find the item being dragged
@@ -397,11 +354,28 @@ impl HierarchicalDragAndDrop {
previous_container_id,
};
//
// compute the drag target areas based on the item and body responses
//
// adjust the drop target to account for the spacing between items
let item_rect = response
.rect
.expand2(egui::Vec2::new(0.0, ui.spacing().item_spacing.y / 2.0));
let body_rect = body_response.map(|r| {
r.rect
.expand2(egui::Vec2::new(0.0, ui.spacing().item_spacing.y))
});
//
// find the candidate drop target
//
let drop_target = crate::drag_and_drop::find_drop_target(
ui,
&item_desc,
response.rect,
body_response.map(|r| r.rect),
item_rect,
body_rect,
response.rect.height(),
);
@@ -413,10 +387,13 @@ impl HierarchicalDragAndDrop {
return;
}
// extend the cursor to the right of the enclosing container
let mut span_x = drop_target.indicator_span_x;
span_x.max = ui.cursor().right();
ui.painter().hline(
drop_target.indicator_span_x,
span_x,
drop_target.indicator_position_y,
//TODO: use style
(2.0, egui::Color32::BLACK),
);

2
examples/hierachical_list_drag_and_drop/src/drag_and_drop.rs
View File

@@ -211,7 +211,7 @@ pub fn find_drop_target<ItemId: Copy>(
);
ui.ctx().debug_painter().debug_rect(
body_insert_after_me_area,
egui::Color32::YELLOW,
egui::Color32::BLUE.gamma_multiply(0.5),
"bdy",
);
}

2
examples/hierachical_list_drag_and_drop/src/main.rs
View File

@@ -15,6 +15,6 @@ fn main() -> Result<(), eframe::Error> {
eframe::run_native(
"My egui App",
options,
Box::new(|cc| Box::<HierarchicalDragAndDrop>::default()),
Box::new(|_cc| Box::<HierarchicalDragAndDrop>::default()),
)
}