feat: 优化代码

app/src/main/java/io/legado/app/ui/book/read/page/ContentTextView.kt

@@ -471,6 +471,9 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
     val selectedText: String
         get() {
             val stringBuilder = StringBuilder()
+            for (relativePos in selectPageStart..selectPageEnd) {
+                val textPage = relativePage(relativePos)
+                if (relativePos == selectPageStart && relativePos == selectPageEnd) {
                     for (lineIndex in selectLineStart..selectLineEnd) {
                         if (lineIndex == selectLineStart && lineIndex == selectLineEnd) {
                             stringBuilder.append(
@@ -493,6 +496,34 @@ class ContentTextView(context: Context, attrs: AttributeSet?) : View(context, at
                             stringBuilder.append(textPage.textLines[lineIndex].text)
                         }
                     }
+                } else if (relativePos == selectPageStart) {
+                    for (lineIndex in selectLineStart until relativePage(relativePos).textLines.size) {
+                        if (lineIndex == selectLineStart) {
+                            stringBuilder.append(
+                                textPage.textLines[lineIndex].text.substring(
+                                    selectCharStart
+                                )
+                            )
+                        } else {
+                            stringBuilder.append(textPage.textLines[lineIndex].text)
+                        }
+                    }
+                } else if (relativePos == selectPageEnd) {
+                    for (lineIndex in 0..selectLineEnd) {
+                        if (lineIndex == selectLineEnd) {
+                            stringBuilder.append(
+                                textPage.textLines[lineIndex].text.substring(0, selectCharEnd + 1)
+                            )
+                        } else {
+                            stringBuilder.append(textPage.textLines[lineIndex].text)
+                        }
+                    }
+                } else if (relativePos in selectPageStart + 1 until selectPageEnd) {
+                    for (lineIndex in selectLineStart..selectLineEnd) {
+                        stringBuilder.append(textPage.textLines[lineIndex].text)
+                    }
+                }
+            }
             return stringBuilder.toString()
         }