all: fix forcetypeasert lint errors (add giu.Assert method)

.golangci.yml

@@ -41,7 +41,7 @@ linters:
     - errcheck
     - errorlint
     - exportloopref
-    #- forcetypeassert
+    - forcetypeassert
     #- funlen
     - gci
     #- godot

CodeEditor.go

@@ -206,7 +206,9 @@ func (ce *CodeEditorWidget) getState() (state *codeEditorState) {
 
 		Context.SetState(ce.title, state)
 	} else {
-		state = s.(*codeEditorState)
+		var isOk bool
+		state, isOk = s.(*codeEditorState)
+		Assert(isOk, "CodeEditorWidget", "getState", "unexpected widget's state type")
 	}
 
 	return state

EventHandler.go

@@ -116,7 +116,9 @@ func (eh *EventHandler) Build() {
 		var state *eventHandlerState
 		stateID := GenAutoID("eventHandlerState")
 		if s := Context.GetState(stateID); s != nil {
-			state = s.(*eventHandlerState)
+			var isOk bool
+			state, isOk = s.(*eventHandlerState)
+			Assert(isOk, "EventHandler", "Build", "unexpected type of state received")
 		} else {
 			newState := &eventHandlerState{}
 			Context.SetState(stateID, newState)

Msgbox.go

@@ -109,7 +109,9 @@ func PrepareMsgbox() Layout {
 				state = &msgboxState{title: "Info", content: "Content", buttons: MsgboxButtonsOk, resultCallback: nil, open: false}
 				Context.SetState(msgboxID, state)
 			} else {
-				state = stateRaw.(*msgboxState)
+				var isOk bool
+				state, isOk = stateRaw.(*msgboxState)
+				Assert(isOk, "MsgboxWidget", "PrepareMsgbox", "got state of unexpected type")
 			}
 
 			if state.open {

ProgressIndicator.go

@@ -68,7 +68,9 @@ func (p *ProgressIndicatorWidget) Build() {
 		Context.SetState(p.internalID, &ps)
 		go ps.update()
 	} else {
-		state := s.(*progressIndicatorState)
+		var isOk bool
+		state, isOk := s.(*progressIndicatorState)
+		Assert(isOk, "ProgressIndicatorWidget", "Build", "got unexpected type of widget's sate")
 
 		child := Child().Border(false).Size(p.width, p.height).Layout(Layout{
 			Custom(func() {

SplitLayout.go

@@ -96,7 +96,9 @@ func (s *SplitLayoutWidget) Build() {
 		splitLayoutState = &SplitLayoutState{delta: 0.0, sashPos: s.sashPos}
 		Context.SetState(stateID, splitLayoutState)
 	} else {
-		splitLayoutState = state.(*SplitLayoutState)
+		var isOk bool
+		splitLayoutState, isOk = state.(*SplitLayoutState)
+		Assert(isOk, "SplitLayoutWidget", "Build", "got unexpected type of widget's state")
 	}
 
 	itemSpacingX, itemSpacingY := GetItemInnerSpacing()

Utils.go

@@ -6,6 +6,7 @@ import (
 	"image/color"
 	"image/draw"
 	"image/png"
+	"log"
 	"os"
 	"path/filepath"
 
@@ -183,3 +184,17 @@ func PushClipRect(clipRectMin, clipRectMax image.Point, intersectWithClipRect bo
 func PopClipRect() {
 	imgui.PopClipRect()
 }
+
+func Assert(cond bool, t, method, msg string, args ...interface{}) {
+	if !cond {
+		fatal(t, method, msg, args...)
+	}
+}
+
+func fatal(widgetName, method, message string, args ...interface{}) {
+	if widgetName != "" {
+		widgetName = fmt.Sprintf("(*%s)", widgetName)
+	}
+
+	log.Panicf("giu: %s.%s: %s", widgetName, method, fmt.Sprintf(message, args...))
+}

Widgets.go

@@ -454,7 +454,9 @@ func (b *ImageButtonWithRgbaWidget) Build() {
 			Context.SetState(b.id, &ImageState{texture: tex})
 		})
 	} else {
-		imgState := state.(*ImageState)
+		var isOk bool
+		imgState, isOk := state.(*ImageState)
+		Assert(isOk, "ImageButtonWithRgbaWidget", "Build", "got unexpected type of widget's state")
 		b.ImageButtonWidget.texture = imgState.texture
 	}
 
@@ -905,7 +907,9 @@ func (i *ImageWithRgbaWidget) Build() {
 				imgState.texture = tex
 			})
 		} else {
-			imgState = state.(*ImageState)
+			var isOk bool
+			imgState, isOk = state.(*ImageState)
+			Assert(isOk, "ImageWithRgbaWidget", "Build", "unexpected type of widget's state recovered")
 		}
 
 		i.img.texture = imgState.texture
@@ -954,7 +958,9 @@ func (i *ImageWithFileWidget) Build() {
 			})
 		}
 	} else {
-		imgState = state.(*ImageState)
+		var isOk bool
+		imgState, isOk = state.(*ImageState)
+		Assert(isOk, "ImageWithFileWidget", "Build", "wrong type of widget's state got")
 	}
 
 	i.img.texture = imgState.texture
@@ -1076,7 +1082,9 @@ func (i *ImageWithURLWidget) Build() {
 			}
 		}()
 	} else {
-		imgState = state.(*ImageState)
+		var isOk bool
+		imgState, isOk = state.(*ImageState)
+		Assert(isOk, "ImageWithURLWidget", "Build", "wrong type of widget's state recovered.")
 	}
 
 	switch {
@@ -1172,7 +1180,9 @@ func (i *InputTextWidget) Build() {
 		state = &inputTextState{}
 		Context.SetState(i.label, state)
 	} else {
-		state = s.(*inputTextState)
+		var isOk bool
+		state, isOk = s.(*inputTextState)
+		Assert(isOk, "InputTextWidget", "Build", "wrong state type recovered.")
 	}
 
 	if i.width != 0 {
@@ -2762,7 +2772,9 @@ func (l *ListBoxWidget) Build() {
 		state = &ListBoxState{selectedIndex: 0}
 		Context.SetState(l.id, state)
 	} else {
-		state = s.(*ListBoxState)
+		var isOk bool
+		state, isOk = s.(*ListBoxState)
+		Assert(isOk, "ListBoxWidget", "Build", "wrong state type recovered")
 	}
 
 	child := Child().Border(l.border).Size(l.width, l.height).Layout(Layout{

Window.go

@@ -187,10 +187,10 @@ func (w *WindowWidget) getStateID() string {
 
 // returns window state
 func (w *WindowWidget) getState() (state *windowState) {
-	s := Context.GetState(w.getStateID())
-
-	if s != nil {
-		state = s.(*windowState)
+	if s := Context.GetState(w.getStateID()); s != nil {
+		var isOk bool
+		state, isOk = s.(*windowState)
+		Assert(isOk, "WindowWidget", "getState", "unexpected state recovered.")
 	} else {
 		state = &windowState{}