Fix element positioning in renderer

- Use gtx.Constraints.Min.X/Y instead of image.Point.ToSize()
- Properly position all elements at their region origins
- Fix StatusBar and BottomBar text positioning

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

internal/ui/render.go

@@ -46,34 +46,30 @@ func (r *Renderer) Draw(gtx layout.Context, elems []Element) {
 
 func (r *Renderer) drawLabel(gtx layout.Context, l Label) {
 	reg := l.Region()
-	c := clip.Rect{
-		Min: image.Point{X: int(reg.X), Y: int(reg.Y)},
-		Max: image.Point{X: int(reg.X + reg.W), Y: int(reg.Y + reg.H)},
-	}.Push(gtx.Ops)
-
 	th := material.NewTheme()
 	th.Shaper = r.shp
 	size := l.FontSize
 	if size == 0 {
 		size = r.theme.FontSize
 	}
+
+	// Position label at region origin
+	gtx.Constraints.Min.X = int(reg.X)
+	gtx.Constraints.Min.Y = int(reg.Y)
 	material.Label(th, size, l.Text).Layout(gtx)
-	c.Pop()
 }
 
 func (r *Renderer) drawListView(gtx layout.Context, lv ListView) {
 	reg := lv.Region()
-	c := clip.Rect{
-		Min: image.Point{X: int(reg.X), Y: int(reg.Y)},
-		Max: image.Point{X: int(reg.X + reg.W), Y: int(reg.Y + reg.H)},
-	}.Push(gtx.Ops)
-
 	th := material.NewTheme()
 	th.Shaper = r.shp
+
+	// Position list view at region origin
+	gtx.Constraints.Min.X = int(reg.X)
+	gtx.Constraints.Min.Y = int(reg.Y)
 	for _, item := range lv.Items {
 		material.Label(th, r.theme.FontSize, item.Text).Layout(gtx)
 	}
-	c.Pop()
 }
 
 func (r *Renderer) drawStatusBar(gtx layout.Context, sb StatusBar) {
@@ -81,10 +77,15 @@ func (r *Renderer) drawStatusBar(gtx layout.Context, sb StatusBar) {
 	th := material.NewTheme()
 	th.Shaper = r.shp
 
+	// Clip to status bar region
+	c := clip.Rect{
+		Min: image.Point{X: int(reg.X), Y: int(reg.Y)},
+		Max: image.Point{X: int(reg.X + reg.W), Y: int(reg.Y + reg.H)},
+	}.Push(gtx.Ops)
+
 	// Line 1: Filename (truncated with ellipsis if needed)
 	filenameLineY := reg.Y
 	filenameLineH := unit.Dp(24)
-	filenameW := reg.W - unit.Dp(16) // 8 DP padding on each side
 
 	// Truncate filename if needed
 	displayFilename := sb.Filename
@@ -93,12 +94,10 @@ func (r *Renderer) drawStatusBar(gtx layout.Context, sb StatusBar) {
 		displayFilename = displayFilename[:27] + "..."
 	}
 
-	clipFilename := clip.Rect{
+	// Position filename at (reg.X + 8, filenameLineY)
-		Min: image.Point{X: int(reg.X + unit.Dp(8)), Y: int(filenameLineY)},
+	gtx.Constraints.Min.X = int(reg.X + unit.Dp(8))
-		Max: image.Point{X: int(reg.X + filenameW), Y: int(filenameLineY + filenameLineH)},
+	gtx.Constraints.Min.Y = int(filenameLineY)
-	}.Push(gtx.Ops)
 	material.Label(th, r.theme.FontSize, displayFilename).Layout(gtx)
-	clipFilename.Pop()
 
 	// Line 2: Icons
 	iconsLineY := filenameLineY + filenameLineH
@@ -130,6 +129,8 @@ func (r *Renderer) drawStatusBar(gtx layout.Context, sb StatusBar) {
 		rightX -= unit.Dp(36)
 		r.drawIconButton(gtx, th, "⚠", rightX, iconY)
 	}
+
+	c.Pop()
 }
 
 func (r *Renderer) drawBottomBar(gtx layout.Context, bb BottomBar) {
@@ -146,38 +147,40 @@ func (r *Renderer) drawBottomBar(gtx layout.Context, bb BottomBar) {
 	// Left: Cursor position
 	cursorX := reg.X + unit.Dp(8)
 	gtx.Constraints.Min.X = int(cursorX)
+	gtx.Constraints.Min.Y = int(reg.Y)
 	material.Label(th, r.theme.FontSize, bb.CursorPos).Layout(gtx)
 
 	// Center: Byte position
 	byteX := reg.X + reg.W/2 - unit.Dp(60) // approximate center
 	gtx.Constraints.Min.X = int(byteX)
+	gtx.Constraints.Min.Y = int(reg.Y)
 	material.Label(th, r.theme.FontSize, bb.BytePos).Layout(gtx)
 
 	// Right: Word wrap button
 	wordWrapX := reg.X + reg.W - unit.Dp(120)
 	gtx.Constraints.Min.X = int(wordWrapX)
+	gtx.Constraints.Min.Y = int(reg.Y)
 	material.Label(th, r.theme.FontSize, "[Word Wrap: "+boolToString(bb.WordWrap)+"]").Layout(gtx)
 
 	c.Pop()
 }
 
 func (r *Renderer) drawButton(gtx layout.Context, btn Button) {
+	reg := btn.Region()
 	th := material.NewTheme()
 	th.Shaper = r.shp
 
-	// Draw button text
+	// Position button at region origin
+	gtx.Constraints.Min.X = int(reg.X)
+	gtx.Constraints.Min.Y = int(reg.Y)
 	material.Label(th, r.theme.FontSize, btn.Text).Layout(gtx)
 }
 
 func (r *Renderer) drawIconButton(gtx layout.Context, th *material.Theme, icon string, x, y unit.Dp) {
-	// Draw icon button
+	// Position icon button at (x, y)
-	iconRegion := Region{X: x, Y: y, W: unit.Dp(24), H: unit.Dp(24)}
+	gtx.Constraints.Min.X = int(x)
-	c := clip.Rect{
+	gtx.Constraints.Min.Y = int(y)
-		Min: image.Point{X: int(iconRegion.X), Y: int(iconRegion.Y)},
-		Max: image.Point{X: int(iconRegion.X + iconRegion.W), Y: int(iconRegion.Y + iconRegion.H)},
-	}.Push(gtx.Ops)
 	material.Label(th, r.theme.FontSize, icon).Layout(gtx)
-	c.Pop()
 }
 
 func boolToString(b bool) string {