debugui: refactoring: add (*Context).cursorPosition

Author: hajimehoshi

control.go

@@ -48,7 +48,7 @@ func (c *Context) inHoverRoot() bool {
 }
 
 func (c *Context) mouseOver(bounds image.Rectangle) bool {
-	p := image.Pt(ebiten.CursorPosition())
+	p := c.cursorPosition()
 	return p.In(bounds) && p.In(c.clipRect()) && c.inHoverRoot()
 }
 
@@ -193,8 +193,7 @@ func (c *Context) slider(value *float64, low, high, step float64, digits int, op
 		var res bool
 		// handle input
 		if c.focus == id && ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
-			x, _ := ebiten.CursorPosition()
-			v = low + float64(x-bounds.Min.X)*(high-low)/float64(bounds.Dx())
+			v = low + float64(c.cursorPosition().X-bounds.Min.X)*(high-low)/float64(bounds.Dx())
 			if step != 0 {
 				v = math.Round(v/step) * step
 			}

helpers.go

@@ -115,8 +115,11 @@ func (c *Context) begin() {
 }
 
 func (c *Context) mouseDelta() image.Point {
-	p := image.Pt(ebiten.CursorPosition())
-	return p.Sub(c.lastMousePos)
+	return c.cursorPosition().Sub(c.lastMousePos)
+}
+
+func (c *Context) cursorPosition() image.Point {
+	return image.Pt(ebiten.CursorPosition())
 }
 
 func (c *Context) end() {
@@ -152,7 +155,7 @@ func (c *Context) end() {
 	}
 
 	// reset input state
-	c.lastMousePos = image.Pt(ebiten.CursorPosition())
+	c.lastMousePos = c.cursorPosition()
 
 	// sort root containers by zindex
 	sort.SliceStable(c.rootList, func(i, j int) bool {

window.go

@@ -41,7 +41,7 @@ func (c *Context) window(title string, bounds image.Rectangle, opt option, f fun
 
 	// set as hover root if the mouse is overlapping this container and it has a
 	// higher zindex than the current hover root
-	if image.Pt(ebiten.CursorPosition()).In(cnt.layout.Bounds) && (c.nextHoverRoot == nil || cnt.zIndex > c.nextHoverRoot.zIndex) {
+	if c.cursorPosition().In(cnt.layout.Bounds) && (c.nextHoverRoot == nil || cnt.zIndex > c.nextHoverRoot.zIndex) {
 		c.nextHoverRoot = cnt
 	}
 
@@ -138,7 +138,7 @@ func (c *Context) OpenPopup(name string) {
 	c.nextHoverRoot = cnt
 	c.hoverRoot = c.nextHoverRoot
 	// position at mouse cursor, open and bring-to-front
-	pt := image.Pt(ebiten.CursorPosition())
+	pt := c.cursorPosition()
 	cnt.layout.Bounds = image.Rectangle{
 		Min: pt,
 		Max: pt.Add(image.Pt(1, 1)),