From bfd94a9e26aad3663cd2a20b620c02e994a72d15 Mon Sep 17 00:00:00 2001
From: Maarten Heremans <maarten@hevanto.be>
Date: Fri, 14 Jun 2024 14:15:47 +0200
Subject: [PATCH] Add callbacks for resize and move

---
 baseview.go      | 11 +++++++++++
 dialog.go        |  3 ++-
 screen/screen.go | 37 ++++++++++++++++++++++++++++++++++++-
 screenhandler.go |  8 ++++++++
 4 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/baseview.go b/baseview.go
index 0fbe6ca..a642384 100644
--- a/baseview.go
+++ b/baseview.go
@@ -10,6 +10,9 @@ import (
 	"github.com/nicksnyder/go-i18n/v2/i18n"
 )
 
+type ResizeCallbackFn func(fyne.Size)
+type MoveCallbackFn func(fyne.Position)
+
 // BaseView represents the base implementation of a view
 // You can create new view types by composing a type around BaseView
 type BaseView struct {
@@ -137,3 +140,11 @@ func (v *BaseView) GetBinding(bindingName string) binding.DataItem {
 func (v *BaseView) GetCanvasObject() fyne.CanvasObject {
 	return v.CanvasObject
 }
+
+func (v *BaseView) RegisterResizeCallback(cb ResizeCallbackFn) {
+	v.ScreenHandler.RegisterResizeCallback(cb)
+}
+
+func (v *BaseView) RegisterMoveCallback(cb MoveCallbackFn) {
+	v.ScreenHandler.RegisterMoveCallback(cb)
+}
diff --git a/dialog.go b/dialog.go
index 7d955d2..6066cb2 100644
--- a/dialog.go
+++ b/dialog.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/fs"
 
+	"bitbucket.org/hevanto/ui/screen"
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/data/binding"
 	"fyne.io/fyne/v2/dialog"
@@ -357,7 +358,7 @@ func (d *FormDialog) SetButtonLabels(
 
 func (d *FormDialog) Initialize() fyne.CanvasObject {
 	if d.itemsFn == nil {
-		form := d.BaseDialog.Initialize().(*fyne.Container)
+		form := d.BaseDialog.Initialize().(*screen.Screen).AsContainer()
 		d.itemsFn = func() []*widget.FormItem {
 			res := make([]*widget.FormItem, 0, len(form.Objects)/2)
 			for i := 0; i < len(form.Objects); i += 2 {
diff --git a/screen/screen.go b/screen/screen.go
index 7e36f7b..3416e60 100644
--- a/screen/screen.go
+++ b/screen/screen.go
@@ -57,8 +57,12 @@ type ScreenHandler interface {
 }
 
 type Screen struct {
+	fyne.CanvasObject
 	rootElement   *Element
 	screenHandler ScreenHandler
+
+	resizeCallbacks []func(fyne.Size)
+	moveCallbacks   []func(fyne.Position)
 }
 
 func New(
@@ -107,13 +111,44 @@ func NewTemplate(
 }
 
 func (s *Screen) Initialize() (obj fyne.CanvasObject, err error) {
-	if obj, err = s.rootElement.BuildUI(s.screenHandler); err != nil {
+	if s.CanvasObject, err = s.rootElement.BuildUI(s.screenHandler); err != nil {
 		err = fmt.Errorf("failed to build screen: %w", err)
 		return
 	}
+	obj = s
 	return
 }
 
+func (s *Screen) Move(p fyne.Position) {
+	s.CanvasObject.Move(p)
+	for _, cb := range s.moveCallbacks {
+		cb(p)
+	}
+}
+
+func (s *Screen) Resize(sz fyne.Size) {
+	s.CanvasObject.Resize(sz)
+	for _, cb := range s.resizeCallbacks {
+		cb(sz)
+	}
+}
+
+func (s *Screen) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(s.CanvasObject)
+}
+
+func (s *Screen) RegisterResizeCallback(cb func(fyne.Size)) {
+	s.resizeCallbacks = append(s.resizeCallbacks, cb)
+}
+
+func (s *Screen) RegisterMoveCallback(cb func(fyne.Position)) {
+	s.moveCallbacks = append(s.moveCallbacks, cb)
+}
+
+func (s *Screen) AsContainer() *fyne.Container {
+	return s.CanvasObject.(*fyne.Container)
+}
+
 type TemplateScreenHandler struct {
 	localizer   *i18n.Localizer
 	elementsMap map[string]*UIElement
diff --git a/screenhandler.go b/screenhandler.go
index ee75ee0..bdf98ce 100644
--- a/screenhandler.go
+++ b/screenhandler.go
@@ -430,3 +430,11 @@ func (h *ScreenHandler) GetOnValidationChangedHandler(name string) screen.Valida
 	}
 	return fn
 }
+
+func (h *ScreenHandler) RegisterResizeCallback(cb ResizeCallbackFn) {
+	h.screenDefinition.RegisterResizeCallback(cb)
+}
+
+func (h *ScreenHandler) RegisterMoveCallback(cb MoveCallbackFn) {
+	h.screenDefinition.RegisterMoveCallback(cb)
+}