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text: remove padding from Editor

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Before this change, the Editor computed a suitable padding for itself
from its font and text. Varying the padding according to the particular
font and text doesn't seem worth it and interferes with higher level widgets'
ability to overlay hints and the like on top of the editor.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-10-10 13:48:25 +02:00
parent f35fe407b3
commit dbb62ae0f6
1 changed files with 46 additions and 60 deletions
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text/editor.go
+46 -60
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@@ -41,22 +41,20 @@ type Editor struct {
// If not enabled, carriage returns are inserted as newlines in the text.
Submit bool
scale int
font editorFont
blinkStart time.Time
focused bool
rr editBuffer
maxWidth int
viewSize image.Point
valid bool
lines []Line
dims layout.Dimensions
padTop, padBottom int
padLeft, padRight int
carWidth fixed.Int26_6
requestFocus bool
caretOn bool
caretScroll bool
scale int
font Font
blinkStart time.Time
focused bool
rr editBuffer
maxWidth int
viewSize image.Point
valid bool
lines []Line
dims layout.Dimensions
carWidth fixed.Int26_6
requestFocus bool
caretOn bool
caretScroll bool
// carXOff is the offset to the current caret
// position when moving between lines.
@@ -201,17 +199,12 @@ func (e *Editor) layout(gtx *layout.Context, s *Shaper, font Font) {
e.scale = scale
}
cs := gtx.Constraints
twoDp := gtx.Px(unit.Dp(2))
e.carWidth = fixed.I(gtx.Px(unit.Dp(1)))
e.padLeft, e.padRight = twoDp, twoDp
maxWidth := cs.Width.Max
if e.SingleLine {
maxWidth = inf
}
if maxWidth != inf {
maxWidth -= e.padLeft + e.padRight
}
if maxWidth != e.maxWidth {
e.maxWidth = maxWidth
e.invalidate()
@@ -232,8 +225,6 @@ func (e *Editor) layout(gtx *layout.Context, s *Shaper, font Font) {
key.InputOp{Key: e, Focus: e.requestFocus}.Add(gtx.Ops)
e.requestFocus = false
baseline := e.padTop + e.dims.Baseline
pointerPadding := gtx.Px(unit.Dp(4))
r := image.Rectangle{Max: e.viewSize}
r.Min.X -= pointerPadding
@@ -243,7 +234,6 @@ func (e *Editor) layout(gtx *layout.Context, s *Shaper, font Font) {
pointer.RectAreaOp{Rect: r}.Add(gtx.Ops)
e.scroller.Add(gtx.Ops)
e.clicker.Add(gtx.Ops)
gtx.Dimensions = layout.Dimensions{Size: e.viewSize, Baseline: baseline}
e.caretOn = false
if e.focused {
now := gtx.Now()
@@ -257,21 +247,24 @@ func (e *Editor) layout(gtx *layout.Context, s *Shaper, font Font) {
}
e.caretOn = e.focused && (!blinking || dt%timePerBlink < timePerBlink/2)
}
gtx.Dimensions = layout.Dimensions{Size: e.viewSize, Baseline: e.dims.Baseline}
}
func (e *Editor) draw(gtx *layout.Context, s *Shaper, font Font) {
var stack op.StackOp
stack.Push(gtx.Ops)
off := image.Point{
X: -e.scrollOff.X + e.padLeft,
Y: -e.scrollOff.Y + e.padTop,
X: -e.scrollOff.X,
Y: -e.scrollOff.Y,
}
clip := e.clipRect()
clip := textPadding(e.lines)
clip.Max = clip.Max.Add(e.viewSize)
it := lineIterator{
Lines: e.lines,
Clip: clip,
Alignment: e.Alignment,
Width: e.viewWidth(),
Width: e.viewSize.X,
Offset: off,
}
for {
@@ -304,10 +297,20 @@ func (e *Editor) drawCaret(gtx *layout.Context) {
Max: image.Point{X: carX.Ceil() + e.carWidth.Ceil(), Y: carY + carDesc.Ceil()},
}
carRect = carRect.Add(image.Point{
X: -e.scrollOff.X + e.padLeft,
Y: -e.scrollOff.Y + e.padTop,
X: -e.scrollOff.X,
Y: -e.scrollOff.Y,
})
carRect = e.clipRect().Intersect(carRect)
clip := textPadding(e.lines)
// Account for caret width to each side.
whalf := (e.carWidth / 2).Ceil()
if clip.Max.X < whalf {
clip.Max.X = whalf
}
if clip.Min.X > -whalf {
clip.Min.X = -whalf
}
clip.Max = clip.Max.Add(e.viewSize)
carRect = clip.Intersect(carRect)
if !carRect.Empty() {
paint.PaintOp{Rect: toRectF(carRect)}.Add(gtx.Ops)
}
@@ -331,17 +334,11 @@ func (e *Editor) SetText(s string) {
e.prepend(s)
}
func (e *Editor) clipRect() image.Rectangle {
clip := textPadding(e.lines)
clip.Max = clip.Max.Add(e.viewSize)
return clip
}
func (e *Editor) scrollBounds() image.Rectangle {
var b image.Rectangle
if e.SingleLine {
if len(e.lines) > 0 {
b.Min.X = align(e.Alignment, e.lines[0].Width, e.viewWidth()).Floor()
b.Min.X = align(e.Alignment, e.lines[0].Width, e.viewSize.X).Floor()
if b.Min.X > 0 {
b.Min.X = 0
}
@@ -379,12 +376,12 @@ func (e *Editor) moveCoord(c unit.Converter, pos image.Point) {
for _, l := range e.lines {
y += (prevDesc + l.Ascent).Ceil()
prevDesc = l.Descent
if y+prevDesc.Ceil() >= pos.Y+e.scrollOff.Y-e.padTop {
if y+prevDesc.Ceil() >= pos.Y+e.scrollOff.Y {
break
}
carLine++
}
x := fixed.I(pos.X + e.scrollOff.X - e.padLeft)
x := fixed.I(pos.X + e.scrollOff.X)
e.moveToLine(x, carLine)
}
@@ -409,18 +406,9 @@ func (e *Editor) layoutText(c unit.Converter, s *Shaper, font Font) {
}
}
}
padTop, padBottom := textPadding(lines)
dims.Size.Y += padTop + padBottom
dims.Size.X += e.padLeft + e.padRight
e.padTop = padTop
e.padBottom = padBottom
e.lines, e.dims = lines, dims
}
func (e *Editor) viewWidth() int {
return e.viewSize.X - e.padLeft - e.padRight
}
func (e *Editor) layoutCaret() (carLine, carCol int, x fixed.Int26_6, y int) {
e.adjustScroll()
var idx int
@@ -446,7 +434,7 @@ loop:
}
idx += len(l.Text.String)
}
x += align(e.Alignment, e.lines[carLine].Width, e.viewWidth())
x += align(e.Alignment, e.lines[carLine].Width, e.viewSize.X)
return
}
@@ -530,7 +518,7 @@ func (e *Editor) moveToLine(carX fixed.Int26_6, carLine2 int) fixed.Int26_6 {
}
}
l2 := e.lines[carLine2]
carX2 := align(e.Alignment, l2.Width, e.viewWidth())
carX2 := align(e.Alignment, l2.Width, e.viewSize.X)
// Only move past the end of the last line
end := 0
if carLine2 < len(e.lines)-1 {
@@ -587,7 +575,7 @@ func (e *Editor) moveEnd() {
e.rr.caret += s
x += adv
}
a := align(e.Alignment, l.Width, e.viewWidth())
a := align(e.Alignment, l.Width, e.viewSize.X)
e.carXOff = l.Width + a - x
}
@@ -595,21 +583,19 @@ func (e *Editor) scrollToCaret() {
carLine, _, x, y := e.layoutCaret()
l := e.lines[carLine]
if e.SingleLine {
minx := (x - e.carWidth/2).Ceil()
if d := minx - e.scrollOff.X + e.padLeft; d < 0 {
if d := x.Floor() - e.scrollOff.X; d < 0 {
e.scrollOff.X += d
}
maxx := (x + e.carWidth/2).Ceil()
if d := maxx - (e.scrollOff.X + e.viewSize.X - e.padRight); d > 0 {
if d := x.Ceil() - (e.scrollOff.X + e.viewSize.X); d > 0 {
e.scrollOff.X += d
}
} else {
miny := y + l.Bounds.Min.Y.Floor()
if d := miny - e.scrollOff.Y + e.padTop; d < 0 {
miny := y - l.Ascent.Ceil()
if d := miny - e.scrollOff.Y; d < 0 {
e.scrollOff.Y += d
}
maxy := y + l.Bounds.Max.Y.Ceil()
if d := maxy - (e.scrollOff.Y + e.viewSize.Y - e.padBottom); d > 0 {
maxy := y + l.Descent.Ceil()
if d := maxy - (e.scrollOff.Y + e.viewSize.Y); d > 0 {
e.scrollOff.Y += d
}
}