Introduce Tooltip::gap to control spacing

examples/tooltip/src/main.rs

@@ -113,5 +113,6 @@ fn tooltip<'a>(
         Text::new("Tooltip"),
         position,
     )
+    .gap(10)
     .into()
 }

graphics/src/widget/tooltip.rs

@@ -30,6 +30,7 @@ where
         content: &Element<'_, Message, Self>,
         tooltip: &Text<Self>,
         position: Position,
+        gap: u16,
     ) -> Self::Output {
         let bounds = content_layout.bounds();
 
@@ -58,18 +59,21 @@ where
             let y_center =
                 bounds.y + (bounds.height - tooltip_bounds.height) / 2.0;
 
+            let gap = f32::from(gap);
+
             let offset = match position {
-                Position::Top => {
-                    Vector::new(x_center, bounds.y - tooltip_bounds.height)
-                }
+                Position::Top => Vector::new(
+                    x_center,
+                    bounds.y - tooltip_bounds.height - gap,
+                ),
                 Position::Bottom => {
-                    Vector::new(x_center, bounds.y + bounds.height)
+                    Vector::new(x_center, bounds.y + bounds.height + gap)
                 }
                 Position::Left => {
-                    Vector::new(bounds.x - tooltip_bounds.width, y_center)
+                    Vector::new(bounds.x - tooltip_bounds.width - gap, y_center)
                 }
                 Position::Right => {
-                    Vector::new(bounds.x + bounds.width, y_center)
+                    Vector::new(bounds.x + bounds.width + gap, y_center)
                 }
                 Position::FollowCursor => Vector::new(
                     cursor_position.x,

native/src/widget/tooltip.rs

@@ -15,6 +15,7 @@ pub struct Tooltip<'a, Message, Renderer: self::Renderer + text::Renderer> {
     content: Element<'a, Message, Renderer>,
     tooltip: Text<Renderer>,
     position: Position,
+    gap: u16,
 }
 
 impl<'a, Message, Renderer> Tooltip<'a, Message, Renderer>
@@ -33,8 +34,15 @@ where
             content: content.into(),
             tooltip,
             position,
+            gap: 0,
         }
     }
+
+    /// Sets the gap between the content and its [`Tooltip`].
+    pub fn gap(mut self, gap: u16) -> Self {
+        self.gap = gap;
+        self
+    }
 }
 
 /// The position of the tooltip. Defaults to following the cursor.
@@ -109,6 +117,7 @@ where
             &self.content,
             &self.tooltip,
             self.position,
+            self.gap,
         )
     }
 
@@ -143,6 +152,7 @@ pub trait Renderer: crate::Renderer + text::Renderer {
         content: &Element<'_, Message, Self>,
         tooltip: &Text<Self>,
         position: Position,
+        gap: u16,
     ) -> Self::Output;
 }