[add][#40] Truncate text on overflow

jeziellago · Nov 29, 2023 · ff47ec1 · ff47ec1
1 parent b7736f3
commit ff47ec1
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Showing 3 changed files with 28 additions and 0 deletions.
diff --git a/markdowntext/src/main/java/dev/jeziellago/compose/markdowntext/MarkdownText.kt b/markdowntext/src/main/java/dev/jeziellago/compose/markdowntext/MarkdownText.kt
@@ -3,6 +3,8 @@ package dev.jeziellago.compose.markdowntext
 import android.content.Context
 import android.graphics.Paint
 import android.os.Build
+import android.text.SpannableStringBuilder
+import android.text.Spanned
 import android.text.method.LinkMovementMethod
 import android.text.util.Linkify
 import android.util.TypedValue
@@ -26,6 +28,7 @@ import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.unit.TextUnit
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.content.res.ResourcesCompat
+import androidx.core.view.doOnNextLayout
 import androidx.core.widget.TextViewCompat
 import coil.ImageLoader
 import io.noties.markwon.AbstractMarkwonPlugin
@@ -56,6 +59,7 @@ fun MarkdownText(
     linkColor: Color = Color.Unspecified,
     fontSize: TextUnit = TextUnit.Unspecified,
     textAlign: TextAlign? = null,
+    truncateOnTextOverflow: Boolean = false,
     lineHeight: TextUnit = TextUnit.Unspecified,
     maxLines: Int = Int.MAX_VALUE,
     isTextSelectable: Boolean = false,
@@ -91,6 +95,7 @@ fun MarkdownText(
                 autoSizeConfig = autoSizeConfig,
                 style = style,
                 textAlign = textAlign,
+                truncateOnTextOverflow = truncateOnTextOverflow,
                 lineHeight = lineHeight,
                 viewId = viewId,
                 onClick = onClick,
@@ -118,6 +123,7 @@ private fun createTextView(
     defaultColor: Color,
     fontSize: TextUnit = TextUnit.Unspecified,
     textAlign: TextAlign? = null,
+    truncateOnTextOverflow: Boolean = false,
     lineHeight: TextUnit,
     maxLines: Int = Int.MAX_VALUE,
     isTextSelectable: Boolean = false,
@@ -181,6 +187,22 @@ private fun createTextView(
             typeface = ResourcesCompat.getFont(context, font)
         }
 
+        if (truncateOnTextOverflow) {
+            doOnNextLayout {
+                if (maxLines != -1 && lineCount > maxLines) {
+                    val endOfLastLine = layout.getLineEnd(maxLines - 1)
+                    val spannedDropLast3Chars = text.subSequence(0, endOfLastLine - 3) as? Spanned
+                    if (spannedDropLast3Chars != null) {
+                        val spannableBuilder = SpannableStringBuilder()
+                            .append(spannedDropLast3Chars)
+                            .append("…")
+
+                        text = spannableBuilder
+                    }
+                }
+            }
+        }
+
         autoSizeConfig?.let { config ->
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                 setAutoSizeTextTypeUniformWithConfiguration(

diff --git a/sample/src/main/java/dev/jeziellago/compose/markdown/MainActivity.kt b/sample/src/main/java/dev/jeziellago/compose/markdown/MainActivity.kt
@@ -11,6 +11,7 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.material.Card
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import dev.jeziellago.compose.markdowntext.MarkdownText
 
@@ -47,6 +48,7 @@ class MainActivity : AppCompatActivity() {
                         markdown = rawMarkdown,
                         viewId =
                         R.id.markdownTextId,
+                        textAlign = TextAlign.Justify,
                         disableLinkMovementMethod = false
                     )
                 }

diff --git a/sample/src/main/res/raw/markdown b/sample/src/main/res/raw/markdown
@@ -1,3 +1,7 @@
+## Justified text
+
+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+
 ---
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