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text: maintain valid Editor scroll offset

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No functional changes.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-10-12 12:35:33 +02:00
parent bc8ad61b54
commit d8e3d1077c
1 changed files with 25 additions and 18 deletions
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text/editor.go
+25 -18
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@@ -97,10 +97,10 @@ func (e *Editor) Event(gtx *layout.Context) (EditorEvent, bool) {
sdist := e.scroller.Scroll(gtx.Config, gtx.Queue, gtx.Now(), axis)
var soff int
if e.SingleLine {
e.scrollOff.X += sdist
e.scrollRel(sdist, 0)
soff = e.scrollOff.X
} else {
e.scrollOff.Y += sdist
e.scrollRel(0, sdist)
soff = e.scrollOff.Y
}
for _, evt := range e.clicker.Events(gtx.Queue) {
@@ -194,12 +194,13 @@ func (e *Editor) layout(gtx *layout.Context, sh *Shaper) {
}
if !e.valid {
e.layoutText(gtx, sh, e.font)
e.lines, e.dims = e.layoutText(gtx, sh, e.font)
e.valid = true
}
e.viewSize = cs.Constrain(e.dims.Size)
e.adjustScroll()
// Adjust scrolling for new viewport and layout.
e.scrollRel(0, 0)
if e.caretScroll {
e.caretScroll = false
@@ -338,7 +339,13 @@ func (e *Editor) scrollBounds() image.Rectangle {
return b
}
func (e *Editor) adjustScroll() {
func (e *Editor) scrollRel(dx, dy int) {
e.scrollAbs(e.scrollOff.X+dx, e.scrollOff.Y+dy)
}
func (e *Editor) scrollAbs(x, y int) {
e.scrollOff.X = x
e.scrollOff.Y = y
b := e.scrollBounds()
if e.scrollOff.X > b.Max.X {
e.scrollOff.X = b.Max.X
@@ -355,7 +362,6 @@ func (e *Editor) adjustScroll() {
}
func (e *Editor) moveCoord(c unit.Converter, pos image.Point) {
e.adjustScroll()
var (
prevDesc fixed.Int26_6
carLine int
@@ -373,7 +379,7 @@ func (e *Editor) moveCoord(c unit.Converter, pos image.Point) {
e.moveToLine(x, carLine)
}
func (e *Editor) layoutText(c unit.Converter, s *Shaper, font Font) {
func (e *Editor) layoutText(c unit.Converter, s *Shaper, font Font) ([]Line, layout.Dimensions) {
txt := e.rr.String()
opts := LayoutOptions{SingleLine: e.SingleLine, MaxWidth: e.maxWidth}
textLayout := s.Layout(c, font, txt, opts)
@@ -391,11 +397,10 @@ func (e *Editor) layoutText(c unit.Converter, s *Shaper, font Font) {
}
}
}
e.lines, e.dims = lines, dims
return lines, dims
}
func (e *Editor) layoutCaret() (carLine, carCol int, x fixed.Int26_6, y int) {
e.adjustScroll()
var idx int
var prevDesc fixed.Int26_6
loop:
@@ -568,21 +573,23 @@ func (e *Editor) scrollToCaret() {
carLine, _, x, y := e.layoutCaret()
l := e.lines[carLine]
if e.SingleLine {
var dist int
if d := x.Floor() - e.scrollOff.X; d < 0 {
e.scrollOff.X += d
}
if d := x.Ceil() - (e.scrollOff.X + e.viewSize.X); d > 0 {
e.scrollOff.X += d
dist = d
} else if d := x.Ceil() - (e.scrollOff.X + e.viewSize.X); d > 0 {
dist = d
}
e.scrollRel(dist, 0)
} else {
miny := y - l.Ascent.Ceil()
if d := miny - e.scrollOff.Y; d < 0 {
e.scrollOff.Y += d
}
maxy := y + l.Descent.Ceil()
if d := maxy - (e.scrollOff.Y + e.viewSize.Y); d > 0 {
e.scrollOff.Y += d
var dist int
if d := miny - e.scrollOff.Y; d < 0 {
dist = d
} else if d := maxy - (e.scrollOff.Y + e.viewSize.Y); d > 0 {
dist = d
}
e.scrollRel(0, dist)
}
}