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Fix hover-to-zoom of font texture in demo

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Closes https://github.com/emilk/egui/issues/220
This commit is contained in:
Emil Ernerfeldt 2021-03-13 12:55:29 +01:00
parent b1883d5d48
commit 6442d254a6
3 changed files with 32 additions and 19 deletions
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37
egui/src/introspection.rs
View file

@ -29,26 +29,27 @@ impl Widget for &epaint::Texture {
let (tex_w, tex_h) = (self.width as f32, self.height as f32); let (tex_w, tex_h) = (self.width as f32, self.height as f32);
let pointer_pos = response.interact_pointer_pos(); response
.on_hover_cursor(CursorIcon::ZoomIn)
.on_hover_ui_at_pointer(|ui| {
if let Some(pos) = ui.input().pointer.latest_pos() {
let (_id, zoom_rect) = ui.allocate_space(vec2(128.0, 128.0));
let u = remap_clamp(pos.x, rect.x_range(), 0.0..=tex_w);
let v = remap_clamp(pos.y, rect.y_range(), 0.0..=tex_h);
response.on_hover_ui(|ui| { let texel_radius = 32.0;
let pos = pointer_pos.unwrap_or_else(|| ui.min_rect().left_top()); let u = u.at_least(texel_radius).at_most(tex_w - texel_radius);
let (_id, zoom_rect) = ui.allocate_space(vec2(128.0, 128.0)); let v = v.at_least(texel_radius).at_most(tex_h - texel_radius);
let u = remap_clamp(pos.x, rect.x_range(), 0.0..=tex_w);
let v = remap_clamp(pos.y, rect.y_range(), 0.0..=tex_h);
let texel_radius = 32.0; let uv_rect = Rect::from_min_max(
let u = u.at_least(texel_radius).at_most(tex_w - texel_radius); pos2((u - texel_radius) / tex_w, (v - texel_radius) / tex_h),
let v = v.at_least(texel_radius).at_most(tex_h - texel_radius); pos2((u + texel_radius) / tex_w, (v + texel_radius) / tex_h),
);
let uv_rect = Rect::from_min_max( let mut mesh = Mesh::default();
pos2((u - texel_radius) / tex_w, (v - texel_radius) / tex_h), mesh.add_rect_with_uv(zoom_rect, uv_rect, Color32::WHITE);
pos2((u + texel_radius) / tex_w, (v + texel_radius) / tex_h), ui.painter().add(Shape::mesh(mesh));
); }
let mut mesh = Mesh::default(); });
mesh.add_rect_with_uv(zoom_rect, uv_rect, Color32::WHITE);
ui.painter().add(Shape::mesh(mesh));
});
}) })
.response .response
} }

12
egui/src/response.rs
View file

@ -267,6 +267,18 @@ impl Response {
self self
} }
/// Like `on_hover_ui`, but show the ui next to cursor.
pub fn on_hover_ui_at_pointer(self, add_contents: impl FnOnce(&mut Ui)) -> Self {
if self.should_show_hover_ui() {
crate::containers::show_tooltip_at_pointer(
&self.ctx,
self.id.with("__tooltip"),
add_contents,
);
}
self
}
fn should_show_hover_ui(&self) -> bool { fn should_show_hover_ui(&self) -> bool {
if self.ctx.memory().everything_is_visible() { if self.ctx.memory().everything_is_visible() {
true true

2
egui/src/style.rs
View file

@ -318,7 +318,7 @@ impl Default for Interaction {
Self { Self {
resize_grab_radius_side: 5.0, resize_grab_radius_side: 5.0,
resize_grab_radius_corner: 10.0, resize_grab_radius_corner: 10.0,
show_tooltips_only_when_still: true, show_tooltips_only_when_still: false,
} }
} }
} }