up

app/src/main/java/io/legado/app/ui/widget/page/ContentView.kt

@@ -27,6 +27,7 @@ import java.util.*
 
 class ContentView : FrameLayout {
     private var isScroll: Boolean = false
+    var callBack: CallBack? = null
     private val bgImage: AppCompatImageView = AppCompatImageView(context)
         .apply {
             scaleType = ImageView.ScaleType.CENTER_CROP
@@ -55,6 +56,13 @@ class ContentView : FrameLayout {
         upTime()
         content_text_view.customSelectionActionModeCallback =
             ContentSelectActionCallback(content_text_view)
+        page_scroll_view?.scrollListener = object : PageScrollView.OnScrollListener {
+            override fun onScroll(scrollY: Int) {
+                content_text_view.layout?.getLineForVertical(scrollY)?.let { line ->
+                    callBack?.scrollToLine(line)
+                }
+            }
+        }
     }
 
     fun upStyle() {
@@ -126,4 +134,8 @@ class ContentView : FrameLayout {
             }
         }
     }
+
+    interface CallBack {
+        fun scrollToLine(line: Int)
+    }
 }

app/src/main/java/io/legado/app/ui/widget/page/PageScrollView.kt

@@ -6,6 +6,7 @@ import android.widget.ScrollView
 
 
 class PageScrollView : ScrollView {
+
     constructor(context: Context) : super(context)
 
     constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
@@ -16,5 +17,14 @@ class PageScrollView : ScrollView {
         defStyleAttr
     )
 
+    var scrollListener: OnScrollListener? = null
+
+    override fun onScrollChanged(l: Int, t: Int, oldl: Int, oldt: Int) {
+        super.onScrollChanged(l, t, oldl, oldt)
+        scrollListener?.onScroll(t)
+    }
 
+    interface OnScrollListener {
+        fun onScroll(scrollY: Int)
+    }
 }

app/src/main/java/io/legado/app/ui/widget/page/PageView.kt

@@ -14,6 +14,7 @@ import io.legado.app.utils.getPrefInt
 class PageView(context: Context, attrs: AttributeSet) :
     FrameLayout(context, attrs),
     PageDelegate.PageInterface,
+    ContentView.CallBack,
     DataSource {
 
     private var callback: CallBack? = null
@@ -36,6 +37,7 @@ class PageView(context: Context, attrs: AttributeSet) :
         setWillNotDraw(false)
         pageFactory = TextPageFactory.create(this)
         upPageAnim()
+        curPage?.callBack = this
     }
 
     override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
@@ -207,6 +209,10 @@ class PageView(context: Context, attrs: AttributeSet) :
         callback?.moveToPrevChapter()
     }
 
+    override fun scrollToLine(line: Int) {
+
+    }
+
     interface CallBack {
         fun chapterSize(): Int
         fun durChapterIndex(): Int