From 5b47ba1f32bb9b177c86675beb566fa9c9e3d2c8 Mon Sep 17 00:00:00 2001
From: Chris Miller <chris@cmiller.me>
Date: Mon, 4 Nov 2019 06:30:25 +0000
Subject: [PATCH] More mouse handling for primitives

---
 button.go                  |  2 +-
 checkbox.go                | 13 +++++++++++++
 demos/presentation/main.go |  2 ++
 dropdown.go                | 11 +++++++++++
 inputfield.go              | 10 ++++++++++
 list.go                    | 32 ++++++++++++++++++++++++++++++++
 6 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/button.go b/button.go
index a54317b..fc46239 100644
--- a/button.go
+++ b/button.go
@@ -136,7 +136,7 @@ func (b *Button) InputHandler() func(event *tcell.EventKey, setFocus func(p Prim
 	})
 }
 
-// InputHandler returns the handler for this primitive.
+// MouseHandler returns the mouse handler for this primitive.
 func (b *Button) MouseHandler() func(event EventMouse) {
 	return b.WrapMouseHandler(func(event EventMouse) {
 		// Process mouse event.
diff --git a/checkbox.go b/checkbox.go
index 91b01bd..6e1d354 100644
--- a/checkbox.go
+++ b/checkbox.go
@@ -201,3 +201,16 @@ func (c *Checkbox) InputHandler() func(event *tcell.EventKey, setFocus func(p Pr
 		}
 	})
 }
+
+// MouseHandler returns the mouse handler for this primitive.
+func (c *Checkbox) MouseHandler() func(event EventMouse) {
+	return c.WrapMouseHandler(func(event EventMouse) {
+		// Process mouse event.
+		if event.Buttons()&tcell.Button1 != 0 {
+			c.checked = !c.checked
+			if c.changed != nil {
+				c.changed(c.checked)
+			}
+		}
+	})
+}
diff --git a/demos/presentation/main.go b/demos/presentation/main.go
index 933bb1e..ce65ef8 100644
--- a/demos/presentation/main.go
+++ b/demos/presentation/main.go
@@ -91,6 +91,8 @@ func main() {
 		return event
 	})
 
+	app.EnableMouse()
+
 	// Start the application.
 	if err := app.SetRoot(layout, true).Run(); err != nil {
 		panic(err)
diff --git a/dropdown.go b/dropdown.go
index 455ea51..e4bbce4 100644
--- a/dropdown.go
+++ b/dropdown.go
@@ -483,3 +483,14 @@ func (d *DropDown) HasFocus() bool {
 	}
 	return d.hasFocus
 }
+
+// MouseHandler returns the mouse handler for this primitive.
+func (d *DropDown) MouseHandler() func(event EventMouse) {
+	return d.WrapMouseHandler(func(event EventMouse) {
+		// Process mouse event.
+		if event.Buttons()&tcell.Button1 != 0 {
+			//d.open = !d.open // FIXME: clicks go through the dropdown!
+			event.SetFocus(d)
+		}
+	})
+}
diff --git a/inputfield.go b/inputfield.go
index 06f736b..7c64ecb 100644
--- a/inputfield.go
+++ b/inputfield.go
@@ -591,3 +591,13 @@ func (i *InputField) InputHandler() func(event *tcell.EventKey, setFocus func(p
 		}
 	})
 }
+
+// MouseHandler returns the mouse handler for this primitive.
+func (i *InputField) MouseHandler() func(event EventMouse) {
+	return i.WrapMouseHandler(func(event EventMouse) {
+		// Process mouse event.
+		if event.Buttons()&tcell.Button1 != 0 {
+			event.SetFocus(i)
+		}
+	})
+}
diff --git a/list.go b/list.go
index 251b922..5b6b22e 100644
--- a/list.go
+++ b/list.go
@@ -549,3 +549,35 @@ func (l *List) InputHandler() func(event *tcell.EventKey, setFocus func(p Primit
 		}
 	})
 }
+
+// returns -1 if not found.
+func (l *List) indexAtPoint(atX, atY int) int {
+	_, y, _, h := l.GetInnerRect()
+	if atY < y || atY >= y+h {
+		return -1
+	}
+
+	n := atY - y
+	if l.showSecondaryText {
+		n /= 2
+	}
+
+	if n >= len(l.items) {
+		return -1
+	}
+	return n
+}
+
+// MouseHandler returns the mouse handler for this primitive.
+func (l *List) MouseHandler() func(event EventMouse) {
+	return l.WrapMouseHandler(func(event EventMouse) {
+		// Process mouse event.
+		if event.Buttons()&tcell.Button1 != 0 {
+			atX, atY := event.Position()
+			index := l.indexAtPoint(atX, atY)
+			if index != -1 {
+				l.SetCurrentItem(index)
+			}
+		}
+	})
+}