From fb6f49024f003ccb259aaabd9c7e55bd6f636c10 Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Date: Thu, 22 Apr 2021 19:45:42 +0200
Subject: [PATCH] Add Response::on_disabled_hover_text to show tooltip for
 disabled widgets

Closes https://github.com/emilk/egui/issues/323
---
 CHANGELOG.md         |  1 +
 egui/src/response.rs | 28 ++++++++++++++++++++++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0e267be4..4f02053f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ NOTE: [`eframe`](eframe/CHANGELOG.md), [`egui_web`](egui_web/CHANGELOG.md) and [
 * Fix [defocus-bug on touch screens](https://github.com/emilk/egui/issues/288).
 * Fix bug with the layout of wide `DragValue`:s.
 
+
 ## 0.11.0 - 2021-04-05 - Optimization, screen reader & new layout logic
 
 ### Added ⭐
diff --git a/egui/src/response.rs b/egui/src/response.rs
index 8d56cf12..d591d53c 100644
--- a/egui/src/response.rs
+++ b/egui/src/response.rs
@@ -289,7 +289,9 @@ impl Response {
         self.changed = true;
     }
 
-    /// Show this UI if the item was hovered (i.e. a tooltip).
+    /// Show this UI if the widget was hovered (i.e. a tooltip).
+    ///
+    /// The text will not be visible if the widget is not enabled.
     /// If you call this multiple times the tooltips will stack underneath the previous ones.
     pub fn on_hover_ui(self, add_contents: impl FnOnce(&mut Ui)) -> Self {
         if self.should_show_hover_ui() {
@@ -303,6 +305,19 @@ impl Response {
         self
     }
 
+    /// Show this UI when hovering if the widget is disabled.
+    pub fn on_disabled_hover_ui(self, add_contents: impl FnOnce(&mut Ui)) -> Self {
+        if !self.enabled && self.ctx.rect_contains_pointer(self.layer_id, self.rect) {
+            crate::containers::show_tooltip_under(
+                &self.ctx,
+                self.id.with("__tooltip"),
+                &self.rect,
+                add_contents,
+            );
+        }
+        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() {
@@ -337,7 +352,9 @@ impl Response {
         }
     }
 
-    /// Show this text if the item was hovered (i.e. a tooltip).
+    /// Show this text if the widget was hovered (i.e. a tooltip).
+    ///
+    /// The text will not be visible if the widget is not enabled.
     /// If you call this multiple times the tooltips will stack underneath the previous ones.
     pub fn on_hover_text(self, text: impl Into<String>) -> Self {
         self.on_hover_ui(|ui| {
@@ -345,6 +362,13 @@ impl Response {
         })
     }
 
+    /// Show this text when hovering if the widget is disabled.
+    pub fn on_disabled_hover_text(self, text: impl Into<String>) -> Self {
+        self.on_disabled_hover_ui(|ui| {
+            ui.add(crate::widgets::Label::new(text));
+        })
+    }
+
     #[deprecated = "Deprecated 2020-10-01: use `on_hover_text` instead."]
     pub fn tooltip_text(self, text: impl Into<String>) -> Self {
         self.on_hover_text(text)