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widget: document update and paint methods on textView

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This commit updates the textView to better describe the expectations
and behaviors of the Update and Paint* methods.

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
This commit is contained in:
Chris Waldon
2023-01-10 12:17:36 -05:00
committed by Elias Naur
parent f6d56dba89
commit 044390c9df
1 changed files with 11 additions and 3 deletions
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widget/text.go
+11 -3
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@@ -186,8 +186,8 @@ func (e *textView) calculateViewSize(gtx layout.Context) image.Point {
}
// Update the text, reshaping it as necessary. If not nil, eventHandling will be invoked after reshaping the text to
// allow parent widgets to adapt to any changes in text content or positioning. If eventHandling invalidates the
// Text, Update will ensure that it is valid again before returning.
// allow parent widgets to adapt to any changes in text content or positioning. If eventHandling modifies the contents
// of the textView, it is guaranteed to be reshaped (and ready for painting) before Update returns.
func (e *textView) Update(gtx layout.Context, lt *text.Shaper, font text.Font, size unit.Sp, eventHandling func(gtx layout.Context)) {
if e.locale != gtx.Locale {
e.locale = gtx.Locale
@@ -234,7 +234,9 @@ func (e *textView) Update(gtx layout.Context, lt *text.Shaper, font text.Font, s
e.makeValid()
}
// PaintSelection paints the contrasting background for selected text.
// PaintSelection clips and paints the visible text selection rectangles. Callers
// are expected to apply an appropriate paint material with a paint.ColorOp or
// similar prior to calling PaintSelection.
func (e *textView) PaintSelection(gtx layout.Context) {
localViewport := image.Rectangle{Max: e.viewSize}
docViewport := image.Rectangle{Max: e.viewSize}.Add(e.scrollOff)
@@ -247,6 +249,9 @@ func (e *textView) PaintSelection(gtx layout.Context) {
}
}
// PaintText clips and paints the visible text glyph outlines. Callers
// are expected to apply an appropriate paint material with a paint.ColorOp or
// similar prior to calling PaintSelection.
func (e *textView) PaintText(gtx layout.Context) {
m := op.Record(gtx.Ops)
viewport := image.Rectangle{
@@ -288,6 +293,9 @@ func (e *textView) caretWidth(gtx layout.Context) int {
return carWidth2
}
// PaintCaret clips and paints the caret rectangle. Callers
// are expected to apply an appropriate paint material with a paint.ColorOp or
// similar prior to calling PaintSelection.
func (e *textView) PaintCaret(gtx layout.Context) {
carWidth2 := e.caretWidth(gtx)
caretPos, carAsc, carDesc := e.CaretInfo()