add editor text watcher

2025-06-08 13:57:10 +09:00 · 2019-03-10 14:26:13 +03:00 · 2019-03-10 14:26:13 +03:00 · 1a2ba32bc2
commit 1a2ba32bc2
parent d099c75604
1 changed files with 65 additions and 0 deletions
--- a/app/src/main/java/com/agileburo/anytype/editor/EditorTextWatcher.kt
+++ b/app/src/main/java/com/agileburo/anytype/editor/EditorTextWatcher.kt
@ -0,0 +1,65 @@
+package com.agileburo.anytype.editor
+
+import android.graphics.Typeface
+import android.text.Editable
+import android.text.SpannableString
+import android.text.Spanned
+import android.text.TextWatcher
+import android.text.style.CharacterStyle
+import android.text.style.StrikethroughSpan
+import android.text.style.StyleSpan
+
+class EditorTextWatcher : TextWatcher {
+
+    var spannableText: SpannableString? = null
+    var spanBold: StyleSpan? = null
+    var spanItalic: StyleSpan? = null
+    var spanStrike: StrikethroughSpan? = null
+
+    var isBoldActive = false
+    var isItalicActive = false
+    var isStrokeThroughActive = false
+
+    override fun afterTextChanged(s: Editable?) {
+        spannableText?.let {
+            spanBold?.let { span ->
+                s?.setSpanWithCheck(it.getSpanStart(span), it.getSpanEnd(span), span)
+            }
+            spanItalic?.let { span ->
+                s?.setSpanWithCheck(it.getSpanStart(span), it.getSpanEnd(span), span)
+            }
+            spanStrike?.let { span ->
+                s?.setSpanWithCheck(it.getSpanStart(span), it.getSpanEnd(span), span)
+            }
+        }
+        spannableText = null
+        spanBold = null
+        spanItalic = null
+        spanStrike = null
+    }
+
+    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
+
+    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
+        spannableText = SpannableString(s).apply {
+            if (isBoldActive) {
+                spanBold = StyleSpan(Typeface.BOLD)
+                setSpan(spanBold, start, start + count, Spanned.SPAN_COMPOSING)
+            }
+            if (isItalicActive) {
+                spanItalic = StyleSpan(Typeface.ITALIC)
+                setSpan(spanItalic, start, start + count, Spanned.SPAN_COMPOSING)
+            }
+            if (isStrokeThroughActive) {
+                spanStrike = StrikethroughSpan()
+                setSpan(spanStrike, start, start + count, Spanned.SPAN_COMPOSING)
+            }
+        }
+    }
+}
+
+fun Editable.setSpanWithCheck(start: Int, end: Int, span: CharacterStyle) {
+    if (start > -1 && end > -1) {
+        this.setSpan(span, start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
+    }
+}