debugui: refactoring

Author: hajimehoshi

window.go container.gowindow.go renamed to container.go

@@ -10,6 +10,31 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 )
 
+type container struct {
+	layout    ContainerLayout
+	headIdx   int
+	tailIdx   int
+	zIndex    int
+	open      bool
+	collapsed bool
+}
+
+// ContainerLayout represents the layout of a container control.
+type ContainerLayout struct {
+	// Bounds is the bounds of the control.
+	Bounds image.Rectangle
+
+	// BodyBounds is the bounds of the body area of the container.
+	BodyBounds image.Rectangle
+
+	// ContentSize is the size of the content.
+	// ContentSize can be larger than Bounds or BodyBounds. In this case, the control should be scrollable.
+	ContentSize image.Point
+
+	// ScrollOffset is the offset of the scroll.
+	ScrollOffset image.Point
+}
+
 func (c *Context) Window(title string, rect image.Rectangle, f func(layout ContainerLayout)) {
 	pc := caller()
 	c.wrapError(func() error {

context.go

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2025 The Ebitengine Authors
+
+package debugui
+
+import (
+	"image"
+
+	"github.com/hajimehoshi/ebiten/v2/exp/textinput"
+)
+
+type Context struct {
+	scaleMinus1   int
+	hover         controlID
+	focus         controlID
+	lastID        controlID
+	lastZIndex    int
+	keepFocus     bool
+	tick          int
+	hoverRoot     *container
+	nextHoverRoot *container
+	scrollTarget  *container
+	numberEditBuf string
+	numberEdit    controlID
+
+	commandList    []*command
+	rootList       []*container
+	containerStack []*container
+	clipStack      []image.Rectangle
+	layoutStack    []layout
+
+	idToContainer map[controlID]*container
+	toggledIDs    map[controlID]struct{}
+
+	lastMousePos image.Point
+
+	textInputTextFields map[controlID]*textinput.Field
+
+	err error
+}

control.go

@@ -13,6 +13,10 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 )
 
+type controlID string
+
+const emptyControlID controlID = ""
+
 const idSeparator = "\x00"
 
 type option int
@@ -265,7 +269,7 @@ func (c *Context) slider(value *float64, low, high, step float64, digits int, op
 	return res, nil
 }
 
-func (c *Context) header(label string, istreenode bool, opt option, callerPC uintptr, f func() error) error {
+func (c *Context) header(label string, isTreeNode bool, opt option, callerPC uintptr, f func() error) error {
 	label, idStr, _ := strings.Cut(label, idSeparator)
 	id := c.idFromCaller(callerPC, idStr)
 	_, toggled := c.toggledIDs[id]
@@ -289,9 +293,7 @@ func (c *Context) header(label string, istreenode bool, opt option, callerPC uin
 				c.toggledIDs[id] = struct{}{}
 			}
 		}
-
-		// draw
-		if istreenode {
+		if isTreeNode {
 			if c.hover == id {
 				c.drawFrame(bounds, ColorButtonHover)
 			}

helpers.go

@@ -58,7 +58,6 @@ func (c *Context) SetScroll(scroll image.Point) {
 }
 
 func (c *Context) container(id controlID, opt option) *container {
-	// try to get existing container from pool
 	if container, ok := c.idToContainer[id]; ok {
 		if !container.open && (^opt&optionClosed) == 0 {
 			delete(c.idToContainer, id)
@@ -70,15 +69,15 @@ func (c *Context) container(id controlID, opt option) *container {
 		return nil
 	}
 
-	// container not found in pool: init new container
 	if c.idToContainer == nil {
 		c.idToContainer = map[controlID]*container{}
 	}
-	cnt := &container{}
+	cnt := &container{
+		headIdx: -1,
+		tailIdx: -1,
+		open:    true,
+	}
 	c.idToContainer[id] = cnt
-	cnt.headIdx = -1
-	cnt.tailIdx = -1
-	cnt.open = true
 	c.bringToFront(cnt)
 	return cnt
 }