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widget: [API] make text.Alignment direction-sensitive

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This commit ensures that text.Alignment is intuitive for
the direction of the text being aligned. RTL text with
Alignment Start will be aligned to the right edge of the area,
whereas LTR text with Alignment Start will continue to be
aligned to the left edge. Vice versa for the End alignment.

References: https://todo.sr.ht/~eliasnaur/gio/146
Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
This commit is contained in:
Chris Waldon
2022-03-16 16:01:41 -04:00
committed by Elias Naur
parent e14bbee252
commit 7daab97fab
2 changed files with 16 additions and 5 deletions
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widget/editor.go
+3 -3
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@@ -851,7 +851,7 @@ 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.viewSize.X).Floor()
b.Min.X = align(e.Alignment, e.locale.Direction, e.lines[0].Width, e.viewSize.X).Floor()
if b.Min.X > 0 {
b.Min.X = 0
}
@@ -1060,7 +1060,7 @@ func seekPosition(lines []text.Line, alignment text.Alignment, width int, start,
start.lineCol.X = 0
start.clusterIndex = 0
l = lines[start.lineCol.Y]
start.x = align(alignment, l.Width, width)
start.x = align(alignment, l.Layout.Direction, l.Width, width)
if l.Layout.Direction.Progression() == system.TowardOrigin {
start.x += l.Width
}
@@ -1213,7 +1213,7 @@ func (e *Editor) moveEnd(selAct selectionAction) {
caret = e.closestPosition(combinedPos{lineCol: screenPos{X: maxInt, Y: caret.lineCol.Y}})
e.caret.start = caret.runes
l := e.lines[caret.lineCol.Y]
a := align(e.Alignment, l.Width, e.viewSize.X)
a := align(e.Alignment, e.locale.Direction, l.Width, e.viewSize.X)
e.caret.xoff = l.Width + a - caret.x
e.updateSelection(selAct)
}