WIP - multi hyperlink

ui/widgets/multihyperlink.go

@@ -0,0 +1,96 @@
+package widgets
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/widget"
+)
+
+type MultiHyperlink struct {
+	widget.BaseWidget
+
+	Segments []MultiHyperlinkSegment
+	OnTapped func(string)
+
+	provider *widget.RichText
+}
+
+type MultiHyperlinkSegment struct {
+	Text   string
+	LinkID string
+}
+
+func NewMultiHyperlink() *MultiHyperlink {
+	c := &MultiHyperlink{
+		provider: widget.NewRichText(),
+	}
+	c.ExtendBaseWidget(c)
+	c.provider.Wrapping = fyne.TextTruncate
+	return c
+}
+
+func (c *MultiHyperlink) syncSegments() {
+	l := len(c.provider.Segments)
+	for i, seg := range c.Segments {
+		appendingSegments := 2*i >= l // true if we need to extend the RichText provider with new segments
+		var rtSeg widget.RichTextSegment
+		if !appendingSegments {
+			rtSeg = c.provider.Segments[2*i]
+		} else if i > 0 {
+			// append new separator segment
+			c.provider.Segments = append(c.provider.Segments, c.newSeparatorSegment())
+		}
+		if seg.LinkID == "" {
+			rtSeg = c.updateOrReplaceTextSegment(rtSeg, seg.Text)
+		} else {
+			rtSeg = c.updateOrReplaceHyperlinkSegment(rtSeg, seg.Text, seg.LinkID)
+		}
+		if appendingSegments {
+			c.provider.Segments = append(c.provider.Segments, rtSeg)
+		} else {
+			c.provider.Segments[2*i] = rtSeg
+		}
+	}
+	// discard extra segments if shortening the multihyperlink
+	for i := 2 * len(c.Segments); i < l; i++ {
+		c.provider.Segments[i] = nil
+	}
+	c.provider.Segments = c.provider.Segments[:2*len(c.Segments)-1]
+}
+
+func (c *MultiHyperlink) newSeparatorSegment() widget.RichTextSegment {
+	return &widget.TextSegment{Text: ", ", Style: widget.RichTextStyle{Inline: true}}
+}
+
+func (c *MultiHyperlink) updateOrReplaceTextSegment(seg widget.RichTextSegment, text string) widget.RichTextSegment {
+	if seg != nil {
+		if ts, ok := seg.(*widget.TextSegment); ok {
+			ts.Text = text
+			return seg
+		}
+	}
+	return &widget.TextSegment{Text: text, Style: widget.RichTextStyle{Inline: true}}
+}
+
+func (c *MultiHyperlink) updateOrReplaceHyperlinkSegment(seg widget.RichTextSegment, text, linkID string) widget.RichTextSegment {
+	if seg != nil {
+		if ts, ok := seg.(*widget.HyperlinkSegment); ok {
+			ts.Text = text
+			// TODO: OnTapped
+			return seg
+		}
+	}
+	return &widget.HyperlinkSegment{Text: text} // TODO: OnTapped
+}
+
+func (c *MultiHyperlink) onSegmentTapped(linkID string) {
+	// TODO
+}
+
+func (c *MultiHyperlink) Refresh() {
+	c.syncSegments()
+	c.BaseWidget.Refresh()
+}
+
+func (c *MultiHyperlink) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(c.provider)
+}