Wait with showing tooltip until mouse has been still for 300ms (emilk#3977)

You can change this with `style.interaction.tooltip_delay§

Author: emilk

crates/egui/src/input_state.rs

@@ -886,8 +886,8 @@ impl PointerState {
 
     /// How long has it been (in seconds) since the pointer was last moved?
     #[inline(always)]
-    pub fn time_since_last_movement(&self) -> f64 {
-        self.time - self.last_move_time
+    pub fn time_since_last_movement(&self) -> f32 {
+        (self.time - self.last_move_time) as f32
     }
 
     /// Was any pointer button pressed (`!down -> down`) this frame?

crates/egui/src/response.rs

@@ -499,13 +499,16 @@ impl Response {
             }
         }
 
-        if !self.is_tooltip_open()
-            && self.ctx.input(|i| i.pointer.time_since_last_movement())
-                < self.ctx.style().interaction.tooltip_delay
-        {
-            // Keep waiting until the mouse has been still for a while
-            self.ctx.request_repaint();
-            return false;
+        if !self.is_tooltip_open() {
+            let time_til_tooltip = self.ctx.style().interaction.tooltip_delay
+                - self.ctx.input(|i| i.pointer.time_since_last_movement());
+
+            if 0.0 < time_til_tooltip {
+                // Wait until the mouse has been still for a while
+                self.ctx
+                    .request_repaint_after(std::time::Duration::from_secs_f32(time_til_tooltip));
+                return false;
+            }
         }
 
         // We don't want tooltips of things while we are dragging them,

crates/egui/src/style.rs

@@ -719,7 +719,7 @@ pub struct Interaction {
     pub show_tooltips_only_when_still: bool,
 
     /// Delay in seconds before showing tooltips after the mouse stops moving
-    pub tooltip_delay: f64,
+    pub tooltip_delay: f32,
 
     /// Can you select the text on a [`crate::Label`] by default?
     pub selectable_labels: bool,
@@ -1128,7 +1128,7 @@ impl Default for Interaction {
             resize_grab_radius_side: 5.0,
             resize_grab_radius_corner: 10.0,
             show_tooltips_only_when_still: true,
-            tooltip_delay: 0.0,
+            tooltip_delay: 0.3,
             selectable_labels: true,
             multi_widget_text_select: true,
         }