From cba07aae645425fa9d6aa701cc210c0000c6c5c2 Mon Sep 17 00:00:00 2001
From: Trevor Slocum <trevor@rocket9labs.com>
Date: Mon, 20 Nov 2023 10:49:16 -0800
Subject: [PATCH] Add Empty method to widgets

---
 box.go  |  8 ++++++++
 go.mod  |  4 ++--
 go.sum  |  8 ++++----
 grid.go | 11 +++++++++++
 4 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/box.go b/box.go
index c71daa3..b142fcd 100644
--- a/box.go
+++ b/box.go
@@ -115,4 +115,12 @@ func (b *Box) AddChild(w ...Widget) {
 	b.children = append(b.children, w...)
 }
 
+// Empty removes all children from the widget.
+func (b *Box) Empty() {
+	b.Lock()
+	defer b.Unlock()
+
+	b.children = b.children[:0]
+}
+
 var _ Widget = &Box{}
diff --git a/go.mod b/go.mod
index 364c870..2523496 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module code.rocket9labs.com/tslocum/etk
 go 1.18
 
 require (
-	code.rocketnine.space/tslocum/messeji v1.0.6-0.20231108225635-7a691903039e
+	code.rocketnine.space/tslocum/messeji v1.0.6-0.20231118073151-fee1357e1e9b
 	github.com/hajimehoshi/ebiten/v2 v2.6.2
 	github.com/llgcode/draw2d v0.0.0-20231022063514-1acb54133d2a
 	golang.org/x/image v0.14.0
@@ -13,7 +13,7 @@ require (
 	github.com/ebitengine/purego v0.5.0 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/jezek/xgb v1.1.0 // indirect
-	golang.org/x/exp/shiny v0.0.0-20231108232855-2478ac86f678 // indirect
+	golang.org/x/exp/shiny v0.0.0-20231110203233-9a3e6036ecaa // indirect
 	golang.org/x/mobile v0.0.0-20231108233038-35478a0c49da // indirect
 	golang.org/x/sync v0.5.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect
diff --git a/go.sum b/go.sum
index 991fc16..98662ca 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-code.rocketnine.space/tslocum/messeji v1.0.6-0.20231108225635-7a691903039e h1:8NByMX1dSs69cmfzHbudEfU9qmcMNl3V2+/RnyLaxm4=
-code.rocketnine.space/tslocum/messeji v1.0.6-0.20231108225635-7a691903039e/go.mod h1:DVSVJUFs9QkKxnGOhk6RSM1q6XcYsMOHqdsLVA7sotQ=
+code.rocketnine.space/tslocum/messeji v1.0.6-0.20231118073151-fee1357e1e9b h1:NyI5ZC016QW3k4itXcsBvpkO6b55+PrwOazq2vzOaVM=
+code.rocketnine.space/tslocum/messeji v1.0.6-0.20231118073151-fee1357e1e9b/go.mod h1:9hzkp+tOkEjCWqOwS1FfAwbbyZtndk6H1ZvhGq4aD6Q=
 github.com/ebitengine/purego v0.5.0 h1:JrMGKfRIAM4/QVKaesIIT7m/UVjTj5GYhRSQYwfVdpo=
 github.com/ebitengine/purego v0.5.0/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
@@ -12,8 +12,8 @@ github.com/jezek/xgb v1.1.0/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFl
 github.com/llgcode/draw2d v0.0.0-20231022063514-1acb54133d2a h1:aP1ySrs3EYBaKOF+1hEUbIMNjT8FZlGGbB73cRAukZw=
 github.com/llgcode/draw2d v0.0.0-20231022063514-1acb54133d2a/go.mod h1:zNlGqkQNLxAN7D2uihSJsrEzrkWrSIK5kmSZU/dN5NY=
 github.com/llgcode/ps v0.0.0-20150911083025-f1443b32eedb h1:61ndUreYSlWFeCY44JxDDkngVoI7/1MVhEl98Nm0KOk=
-golang.org/x/exp/shiny v0.0.0-20231108232855-2478ac86f678 h1:nDuntdpRJsxpHuFwQ/TTrOkfIwx+TEDnolEyUNVL/60=
-golang.org/x/exp/shiny v0.0.0-20231108232855-2478ac86f678/go.mod h1:UH99kUObWAZkDnWqppdQe5ZhPYESUw8I0zVV1uWBR+0=
+golang.org/x/exp/shiny v0.0.0-20231110203233-9a3e6036ecaa h1:9AiXA/XkU9MpMQpJQ71TkQDEnWbOdpZfbQkqR+GsseU=
+golang.org/x/exp/shiny v0.0.0-20231110203233-9a3e6036ecaa/go.mod h1:UH99kUObWAZkDnWqppdQe5ZhPYESUw8I0zVV1uWBR+0=
 golang.org/x/image v0.14.0 h1:tNgSxAFe3jC4uYqvZdTr84SZoM1KfwdC9SKIFrLjFn4=
 golang.org/x/image v0.14.0/go.mod h1:HUYqC05R2ZcZ3ejNQsIHQDQiwWM4JBqmm6MKANTp4LE=
 golang.org/x/mobile v0.0.0-20231108233038-35478a0c49da h1:gS9sVMAeHM+gVBmM9bTM6vUi/NHv58O3QzJ3vjjN84M=
diff --git a/grid.go b/grid.go
index 4c4aa1b..d6e1576 100644
--- a/grid.go
+++ b/grid.go
@@ -101,6 +101,17 @@ func (g *Grid) AddChildAt(wgt Widget, x int, y int, columns int, rows int) {
 	g.updated = true
 }
 
+// Empty removes all children from the Grid.
+func (g *Grid) Empty() {
+	g.Lock()
+	defer g.Unlock()
+
+	g.children = g.children[:0]
+	g.cellPositions = g.cellPositions[:0]
+	g.cellSpans = g.cellSpans[:0]
+	g.updated = true
+}
+
 // HandleKeyboard is called when a keyboard event occurs.
 func (g *Grid) HandleKeyboard(ebiten.Key, rune) (handled bool, err error) {
 	if g.updated {