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Rename viewports example to test_viewports, and hide drag-and-drop
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@emilk
emilk committed Nov 6, 2023
1 parent 73432ba commit 291ab1e
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Showing 4 changed files with 98 additions and 85 deletions.
16 changes: 8 additions & 8 deletions Cargo.lock
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2 changes: 1 addition & 1 deletion examples/viewports/Cargo.toml → examples/test_viewports/Cargo.toml
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
[package]
name = "viewports"
name = "test_viewports"
version = "0.1.0"
authors = ["konkitoman"]
license = "MIT OR Apache-2.0"
Expand Down
1 change: 1 addition & 0 deletions examples/test_viewports/README.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
This is a test of the viewports feature of eframe and egui, where we show off using multiple windows.
164 changes: 88 additions & 76 deletions examples/viewports/src/main.rs → examples/test_viewports/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,9 @@ use std::sync::Arc;
use eframe::egui;
use egui::{mutex::RwLock, Id, InnerResponse, ViewportBuilder, ViewportId};

// Drag-and-drop between windows is not yet implemented, but if you wanna work on it, enable this:
pub const DRAG_AND_DROP_TEST: bool = false;

fn main() {
env_logger::init(); // Use `RUST_LOG=debug` to see logs.

Expand Down Expand Up @@ -109,7 +112,7 @@ impl eframe::App for App {
ctx.set_force_embedding(force_embedding);
}

generic_ui(ui, Id::new("root_viewport"), &self.top);
generic_ui(ui, &self.top);
});
}
}
Expand All @@ -130,7 +133,7 @@ fn show_async_viewport(
let mut vp_state = vp_state.write();
show_as_popup(ctx, &title, id, move |ui: &mut egui::Ui| {
ui.add(egui::DragValue::new(&mut vp_state.count).prefix("Count: "));
generic_ui(ui, id, &vp_state.children);
generic_ui(ui, &vp_state.children);
});
},
);
Expand All @@ -146,82 +149,12 @@ fn show_sync_viewport(ctx: &egui::Context, vp_id: ViewportId, vp_state: &mut Vie
move |ctx| {
show_as_popup(ctx, &vp_state.title, id, |ui: &mut egui::Ui| {
ui.add(egui::DragValue::new(&mut vp_state.count).prefix("Count: "));
generic_ui(ui, id, &vp_state.children);
generic_ui(ui, &vp_state.children);
});
},
);
}

// This is taken from crates/egui_demo_lib/src/debo/drag_and_drop.rs
fn drag_source<R>(
ui: &mut egui::Ui,
id: egui::Id,
body: impl FnOnce(&mut egui::Ui) -> R,
) -> InnerResponse<R> {
let is_being_dragged = ui.memory(|mem| mem.is_being_dragged(id));

if !is_being_dragged {
let res = ui.scope(body);

// Check for drags:
let response = ui.interact(res.response.rect, id, egui::Sense::drag());
if response.hovered() {
ui.ctx().set_cursor_icon(egui::CursorIcon::Grab);
}
res
} else {
ui.ctx().set_cursor_icon(egui::CursorIcon::Grabbing);

// Paint the body to a new layer:
let layer_id = egui::LayerId::new(egui::Order::Tooltip, id);
let res = ui.with_layer_id(layer_id, body);

if let Some(pointer_pos) = ui.ctx().pointer_interact_pos() {
let delta = pointer_pos - res.response.rect.center();
ui.ctx().translate_layer(layer_id, delta);
}

res
}
}

// This is taken from crates/egui_demo_lib/src/debo/drag_and_drop.rs
fn drop_target<R>(
ui: &mut egui::Ui,
body: impl FnOnce(&mut egui::Ui) -> R,
) -> egui::InnerResponse<R> {
let is_being_dragged = ui.memory(|mem| mem.is_anything_being_dragged());

let margin = egui::Vec2::splat(ui.visuals().clip_rect_margin); // 3.0

let background_id = ui.painter().add(egui::Shape::Noop);

let available_rect = ui.available_rect_before_wrap();
let inner_rect = available_rect.shrink2(margin);
let mut content_ui = ui.child_ui(inner_rect, *ui.layout());
let ret = body(&mut content_ui);

let outer_rect =
egui::Rect::from_min_max(available_rect.min, content_ui.min_rect().max + margin);
let (rect, response) = ui.allocate_at_least(outer_rect.size(), egui::Sense::hover());

let style = if is_being_dragged && response.hovered() {
ui.visuals().widgets.active
} else {
ui.visuals().widgets.inactive
};

let fill = style.bg_fill;
let stroke = style.bg_stroke;

ui.painter().set(
background_id,
egui::epaint::RectShape::new(rect, style.rounding, fill, stroke),
);

egui::InnerResponse::new(ret, response)
}

/// This will make the content as a popup if cannot has his own native window
fn show_as_popup(ctx: &egui::Context, title: &str, id: Id, content: impl FnOnce(&mut egui::Ui)) {
if ctx.viewport_id() == ctx.parent_viewport_id() {
Expand All @@ -231,7 +164,9 @@ fn show_as_popup(ctx: &egui::Context, title: &str, id: Id, content: impl FnOnce(
}
}

fn generic_ui(ui: &mut egui::Ui, container_id: Id, children: &[Arc<RwLock<ViewportState>>]) {
fn generic_ui(ui: &mut egui::Ui, children: &[Arc<RwLock<ViewportState>>]) {
let container_id = ui.id();

let ctx = ui.ctx().clone();
ui.label(format!(
"Frame nr: {} (this increases when this viewport is being rendered)",
Expand Down Expand Up @@ -304,7 +239,9 @@ fn generic_ui(ui: &mut egui::Ui, container_id: Id, children: &[Arc<RwLock<Viewpo
}
}

drag_and_drop_test(ui, container_id);
if DRAG_AND_DROP_TEST {
drag_and_drop_test(ui);
}

if !children.is_empty() {
ui.separator();
Expand All @@ -325,10 +262,15 @@ fn generic_ui(ui: &mut egui::Ui, container_id: Id, children: &[Arc<RwLock<Viewpo
}
}

fn drag_and_drop_test(ui: &mut egui::Ui, container_id: Id) {
// ----------------------------------------------------------------------------
// Drag-and-drop between windows is not yet implemented, but there is some test code for it here:

fn drag_and_drop_test(ui: &mut egui::Ui) {
use std::collections::HashMap;
use std::sync::OnceLock;

let container_id = ui.id();

const COLS: usize = 2;
static DATA: OnceLock<RwLock<DragAndDrop>> = OnceLock::new();
let data = DATA.get_or_init(Default::default);
Expand Down Expand Up @@ -431,3 +373,73 @@ fn drag_and_drop_test(ui: &mut egui::Ui, container_id: Id) {
}
});
}

// This is taken from crates/egui_demo_lib/src/debo/drag_and_drop.rs
fn drag_source<R>(
ui: &mut egui::Ui,
id: egui::Id,
body: impl FnOnce(&mut egui::Ui) -> R,
) -> InnerResponse<R> {
let is_being_dragged = ui.memory(|mem| mem.is_being_dragged(id));

if !is_being_dragged {
let res = ui.scope(body);

// Check for drags:
let response = ui.interact(res.response.rect, id, egui::Sense::drag());
if response.hovered() {
ui.ctx().set_cursor_icon(egui::CursorIcon::Grab);
}
res
} else {
ui.ctx().set_cursor_icon(egui::CursorIcon::Grabbing);

// Paint the body to a new layer:
let layer_id = egui::LayerId::new(egui::Order::Tooltip, id);
let res = ui.with_layer_id(layer_id, body);

if let Some(pointer_pos) = ui.ctx().pointer_interact_pos() {
let delta = pointer_pos - res.response.rect.center();
ui.ctx().translate_layer(layer_id, delta);
}

res
}
}

// This is taken from crates/egui_demo_lib/src/debo/drag_and_drop.rs
fn drop_target<R>(
ui: &mut egui::Ui,
body: impl FnOnce(&mut egui::Ui) -> R,
) -> egui::InnerResponse<R> {
let is_being_dragged = ui.memory(|mem| mem.is_anything_being_dragged());

let margin = egui::Vec2::splat(ui.visuals().clip_rect_margin); // 3.0

let background_id = ui.painter().add(egui::Shape::Noop);

let available_rect = ui.available_rect_before_wrap();
let inner_rect = available_rect.shrink2(margin);
let mut content_ui = ui.child_ui(inner_rect, *ui.layout());
let ret = body(&mut content_ui);

let outer_rect =
egui::Rect::from_min_max(available_rect.min, content_ui.min_rect().max + margin);
let (rect, response) = ui.allocate_at_least(outer_rect.size(), egui::Sense::hover());

let style = if is_being_dragged && response.hovered() {
ui.visuals().widgets.active
} else {
ui.visuals().widgets.inactive
};

let fill = style.bg_fill;
let stroke = style.bg_stroke;

ui.painter().set(
background_id,
egui::epaint::RectShape::new(rect, style.rounding, fill, stroke),
);

egui::InnerResponse::new(ret, response)
}

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