Add `PointerState::button_double_clicked()` and `PointerState::button_triple_clicked()`. (#1907)

Co-authored-by: eranfu <eranfu@tencent.com>

CHANGELOG.md

@@ -18,6 +18,7 @@ NOTE: [`epaint`](epaint/CHANGELOG.md), [`eframe`](eframe/CHANGELOG.md), [`egui-w
 * Added `Contex::request_repaint_after` ([#1694](https://github.com/emilk/egui/pull/1694)).
 * `ctrl-h` now acts like backspace in `TextEdit` ([#1812](https://github.com/emilk/egui/pull/1812)).
 * Added `RawInput::has_focus` which backends can set to indicate whether the UI as a whole has the keyboard focus ([#1859](https://github.com/emilk/egui/pull/1859)).
+* Added `PointerState::button_double_clicked()` and `PointerState::button_triple_clicked()` ([#1906](https://github.com/emilk/egui/issues/1906)).
 
 ### Changed
 * MSRV (Minimum Supported Rust Version) is now `1.61.0` ([#1846](https://github.com/emilk/egui/pull/1846)).

egui/src/input_state.rs

@@ -750,6 +750,20 @@ impl PointerState {
             .any(|event| matches!(event, &PointerEvent::Pressed { button: b, .. } if button == b))
     }
 
+    /// Was the button given double clicked this frame?
+    pub fn button_double_clicked(&self, button: PointerButton) -> bool {
+        self.pointer_events
+            .iter()
+            .any(|event| matches!(&event, PointerEvent::Released(Some(click)) if click.button == button && click.is_double()))
+    }
+
+    /// Was the button given triple clicked this frame?
+    pub fn button_triple_clicked(&self, button: PointerButton) -> bool {
+        self.pointer_events
+            .iter()
+            .any(|event| matches!(&event, PointerEvent::Released(Some(click)) if click.button == button && click.is_triple()))
+    }
+
     /// Was the primary button clicked this frame?
     pub fn primary_clicked(&self) -> bool {
         self.button_clicked(PointerButton::Primary)