From 5ae391ec8ba9b5a25fda9cc9df70a3924f10d4bb Mon Sep 17 00:00:00 2001
From: gucio321 <gucio321@protonmail.com>
Date: Wed, 20 Oct 2021 19:19:30 +0200
Subject: [PATCH] add api for imgui.MemoryEditor (close #393)

---
 MemoryEditor.go                       | 60 +++++++++++++++++++++++++++
 examples/memoryeditor/memoryeditor.go | 12 ++----
 2 files changed, 63 insertions(+), 9 deletions(-)
 create mode 100644 MemoryEditor.go

diff --git a/MemoryEditor.go b/MemoryEditor.go
new file mode 100644
index 00000000..eef68cf1
--- /dev/null
+++ b/MemoryEditor.go
@@ -0,0 +1,60 @@
+package giu
+
+import (
+	"github.com/AllenDang/imgui-go"
+)
+
+type memoryEditorState struct {
+	editor imgui.MemoryEditor
+}
+
+// Dispose implements Disposable interface.
+func (s *memoryEditorState) Dispose() {
+	// noop
+}
+
+// MemoryEditorWidget - Mini memory editor for Dear ImGui
+// (to embed in your game/tools)
+//
+// Right-click anywhere to access the Options menu!
+// You can adjust the keyboard repeat delay/rate in ImGuiIO.
+// The code assume a mono-space font for simplicity!
+// If you don't use the default font, use ImGui::PushFont()/PopFont() to switch to a mono-space font before calling this.
+type MemoryEditorWidget struct {
+	id       string
+	contents []byte
+}
+
+// MemoryEditor creates nwe memory editor widget.
+func MemoryEditor() *MemoryEditorWidget {
+	return &MemoryEditorWidget{
+		id: GenAutoID("memoryEditor"),
+	}
+}
+
+// Contents sets editor's conents.
+func (me *MemoryEditorWidget) Contents(contents []byte) *MemoryEditorWidget {
+	me.contents = contents
+	return me
+}
+
+// Build implements widget inetrface.
+func (me *MemoryEditorWidget) Build() {
+	me.getState().editor.DrawContents(me.contents)
+}
+
+func (me *MemoryEditorWidget) getState() (state *memoryEditorState) {
+	if s := Context.GetState(me.id); s == nil {
+		state = &memoryEditorState{
+			editor: imgui.NewMemoryEditor(),
+		}
+
+		Context.SetState(me.id, state)
+	} else {
+		var ok bool
+		state, ok = s.(*memoryEditorState)
+		Assert(ok, "MemoryEditorWidget", "getState", "incorrect state type recovered.")
+	}
+
+	return state
+}
diff --git a/examples/memoryeditor/memoryeditor.go b/examples/memoryeditor/memoryeditor.go
index 20585af9..e92462e6 100644
--- a/examples/memoryeditor/memoryeditor.go
+++ b/examples/memoryeditor/memoryeditor.go
@@ -4,13 +4,11 @@ import (
 	"fmt"
 
 	g "github.com/AllenDang/giu"
-	"github.com/AllenDang/imgui-go"
 )
 
 var (
-	buf       []uint8
-	memEditor imgui.MemoryEditor
-	content   string
+	buf     []uint8
+	content string
 )
 
 func loop() {
@@ -18,16 +16,12 @@ func loop() {
 		g.Button("Print data value").OnClick(func() {
 			fmt.Println(buf)
 		}),
-		g.Custom(func() {
-			memEditor.DrawContents(buf)
-		}),
+		g.MemoryEditor().Contents(buf),
 	)
 }
 
 func main() {
 	buf = []uint8{1, 2, 3, 4, 5, 6, 7}
-	memEditor = imgui.NewMemoryEditor()
-
 	wnd := g.NewMasterWindow("Memory Editor", 800, 600, 0)
 	wnd.Run(loop)
 }