pull/517/head
gedoor
4 years ago
parent
1f3cf8c0c4
commit
e4c2cfdb92
@ -1,437 +0,0 @@ |
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package io.legado.app.ui.widget.text |
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|
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import android.app.Activity |
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import android.graphics.RectF |
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import android.text.Selection |
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import android.text.Spannable |
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import android.text.Spanned |
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import android.text.method.LinkMovementMethod |
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import android.text.style.BackgroundColorSpan |
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import android.text.style.ClickableSpan |
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import android.text.style.URLSpan |
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import android.text.util.Linkify |
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import android.view.* |
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import android.widget.TextView |
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import io.legado.app.R |
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import io.legado.app.ui.widget.text.BetterLinkMovementMethod.LongPressTimer.OnTimerReachedListener |
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|
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class BetterLinkMovementMethod protected constructor() : LinkMovementMethod() { |
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private var onLinkClickListener: OnLinkClickListener? = null |
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private var onLinkLongClickListener: OnLinkLongClickListener? = null |
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private val touchedLineBounds = RectF() |
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private var isUrlHighlighted = false |
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private var clickableSpanUnderTouchOnActionDown: ClickableSpan? = null |
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private var activeTextViewHashcode = 0 |
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private var ongoingLongPressTimer: LongPressTimer? = null |
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private var wasLongPressRegistered = false |
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|
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interface OnLinkClickListener { |
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/** |
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* @param textView The TextView on which a click was registered. |
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* @param url The clicked URL. |
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* @return True if this click was handled. False to let Android handle the URL. |
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*/ |
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fun onClick(textView: TextView?, url: String?): Boolean |
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} |
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|
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interface OnLinkLongClickListener { |
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/** |
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* @param textView The TextView on which a long-click was registered. |
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* @param url The long-clicked URL. |
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* @return True if this long-click was handled. False to let Android handle the URL (as a short-click). |
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*/ |
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fun onLongClick(textView: TextView?, url: String?): Boolean |
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} |
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|
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/** |
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* Set a listener that will get called whenever any link is clicked on the TextView. |
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*/ |
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fun setOnLinkClickListener(clickListener: OnLinkClickListener?): BetterLinkMovementMethod { |
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if (this === singleInstance) { |
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throw UnsupportedOperationException( |
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"Setting a click listener on the instance returned by getInstance() is not supported to avoid memory " + |
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"leaks. Please use newInstance() or any of the linkify() methods instead." |
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) |
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} |
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onLinkClickListener = clickListener |
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return this |
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} |
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|
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/** |
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* Set a listener that will get called whenever any link is clicked on the TextView. |
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*/ |
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fun setOnLinkLongClickListener(longClickListener: OnLinkLongClickListener?): BetterLinkMovementMethod { |
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if (this === singleInstance) { |
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throw UnsupportedOperationException( |
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"Setting a long-click listener on the instance returned by getInstance() is not supported to avoid " + |
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"memory leaks. Please use newInstance() or any of the linkify() methods instead." |
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) |
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} |
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onLinkLongClickListener = longClickListener |
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return this |
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} |
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|
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override fun onTouchEvent(textView: TextView, text: Spannable, event: MotionEvent): Boolean { |
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if (activeTextViewHashcode != textView.hashCode()) { |
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// Bug workaround: TextView stops calling onTouchEvent() once any URL is highlighted. |
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// A hacky solution is to reset any "autoLink" property set in XML. But we also want |
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// to do this once per TextView. |
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activeTextViewHashcode = textView.hashCode() |
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textView.autoLinkMask = 0 |
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} |
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val clickableSpanUnderTouch = findClickableSpanUnderTouch(textView, text, event) |
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if (event.action == MotionEvent.ACTION_DOWN) { |
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clickableSpanUnderTouchOnActionDown = clickableSpanUnderTouch |
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} |
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val touchStartedOverAClickableSpan = clickableSpanUnderTouchOnActionDown != null |
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return when (event.action) { |
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MotionEvent.ACTION_DOWN -> { |
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clickableSpanUnderTouch?.let { highlightUrl(textView, it, text) } |
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if (touchStartedOverAClickableSpan && onLinkLongClickListener != null) { |
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val longClickListener: OnTimerReachedListener = |
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object : OnTimerReachedListener { |
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override fun onTimerReached() { |
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wasLongPressRegistered = true |
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textView.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS) |
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removeUrlHighlightColor(textView) |
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dispatchUrlLongClick(textView, clickableSpanUnderTouch) |
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} |
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} |
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startTimerForRegisteringLongClick(textView, longClickListener) |
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} |
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touchStartedOverAClickableSpan |
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} |
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MotionEvent.ACTION_UP -> { |
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// Register a click only if the touch started and ended on the same URL. |
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if (!wasLongPressRegistered && touchStartedOverAClickableSpan && clickableSpanUnderTouch === clickableSpanUnderTouchOnActionDown) { |
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dispatchUrlClick(textView, clickableSpanUnderTouch) |
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} |
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cleanupOnTouchUp(textView) |
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|
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// Consume this event even if we could not find any spans to avoid letting Android handle this event. |
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// Android's TextView implementation has a bug where links get clicked even when there is no more text |
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// next to the link and the touch lies outside its bounds in the same direction. |
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touchStartedOverAClickableSpan |
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} |
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MotionEvent.ACTION_CANCEL -> { |
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cleanupOnTouchUp(textView) |
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false |
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} |
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MotionEvent.ACTION_MOVE -> { |
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// Stop listening for a long-press as soon as the user wanders off to unknown lands. |
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if (clickableSpanUnderTouch !== clickableSpanUnderTouchOnActionDown) { |
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removeLongPressCallback(textView) |
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} |
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if (!wasLongPressRegistered) { |
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// Toggle highlight. |
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if (clickableSpanUnderTouch != null) { |
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highlightUrl(textView, clickableSpanUnderTouch, text) |
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} else { |
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removeUrlHighlightColor(textView) |
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} |
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} |
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touchStartedOverAClickableSpan |
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} |
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else -> false |
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} |
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} |
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|
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private fun cleanupOnTouchUp(textView: TextView) { |
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wasLongPressRegistered = false |
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clickableSpanUnderTouchOnActionDown = null |
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removeUrlHighlightColor(textView) |
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removeLongPressCallback(textView) |
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} |
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|
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/** |
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* Determines the touched location inside the TextView's text and returns the ClickableSpan found under it (if any). |
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* |
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* @return The touched ClickableSpan or null. |
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*/ |
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protected fun findClickableSpanUnderTouch( |
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textView: TextView, |
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text: Spannable, |
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event: MotionEvent |
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): ClickableSpan? { |
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// So we need to find the location in text where touch was made, regardless of whether the TextView |
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// has scrollable text. That is, not the entire text is currently visible. |
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var touchX = event.x.toInt() |
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var touchY = event.y.toInt() |
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// Ignore padding. |
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touchX -= textView.totalPaddingLeft |
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touchY -= textView.totalPaddingTop |
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// Account for scrollable text. |
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touchX += textView.scrollX |
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touchY += textView.scrollY |
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val layout = textView.layout |
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val touchedLine = layout.getLineForVertical(touchY) |
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val touchOffset = layout.getOffsetForHorizontal(touchedLine, touchX.toFloat()) |
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touchedLineBounds.left = layout.getLineLeft(touchedLine) |
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touchedLineBounds.top = layout.getLineTop(touchedLine).toFloat() |
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touchedLineBounds.right = layout.getLineWidth(touchedLine) + touchedLineBounds.left |
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touchedLineBounds.bottom = layout.getLineBottom(touchedLine).toFloat() |
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return if (touchedLineBounds.contains(touchX.toFloat(), touchY.toFloat())) { |
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// Find a ClickableSpan that lies under the touched area. |
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val spans = text.getSpans(touchOffset, touchOffset, ClickableSpan::class.java) |
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for (span in spans) { |
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if (span is ClickableSpan) { |
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return span |
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} |
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} |
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// No ClickableSpan found under the touched location. |
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null |
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} else { |
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// Touch lies outside the line's horizontal bounds where no spans should exist. |
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null |
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} |
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} |
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/** |
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* Adds a background color span at <var>clickableSpan</var>'s location. |
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*/ |
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protected fun highlightUrl(textView: TextView, clickableSpan: ClickableSpan?, text: Spannable) { |
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if (isUrlHighlighted) { |
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return |
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} |
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isUrlHighlighted = true |
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val spanStart = text.getSpanStart(clickableSpan) |
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val spanEnd = text.getSpanEnd(clickableSpan) |
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val highlightSpan = BackgroundColorSpan(textView.highlightColor) |
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text.setSpan(highlightSpan, spanStart, spanEnd, Spannable.SPAN_INCLUSIVE_INCLUSIVE) |
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textView.setTag(R.id.bettermovementmethod_highlight_background_span, highlightSpan) |
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Selection.setSelection(text, spanStart, spanEnd) |
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} |
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/** |
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* Removes the highlight color under the Url. |
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*/ |
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protected fun removeUrlHighlightColor(textView: TextView) { |
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if (!isUrlHighlighted) { |
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return |
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} |
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isUrlHighlighted = false |
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val text = textView.text as Spannable |
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val highlightSpan = |
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textView.getTag(R.id.bettermovementmethod_highlight_background_span) as BackgroundColorSpan |
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text.removeSpan(highlightSpan) |
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Selection.removeSelection(text) |
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} |
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protected fun startTimerForRegisteringLongClick( |
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textView: TextView, |
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longClickListener: OnTimerReachedListener? |
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) { |
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ongoingLongPressTimer = LongPressTimer() |
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ongoingLongPressTimer!!.setOnTimerReachedListener(longClickListener) |
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textView.postDelayed( |
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ongoingLongPressTimer, |
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ViewConfiguration.getLongPressTimeout().toLong() |
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) |
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} |
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/** |
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* Remove the long-press detection timer. |
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*/ |
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protected fun removeLongPressCallback(textView: TextView) { |
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if (ongoingLongPressTimer != null) { |
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textView.removeCallbacks(ongoingLongPressTimer) |
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ongoingLongPressTimer = null |
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} |
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} |
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protected fun dispatchUrlClick(textView: TextView, clickableSpan: ClickableSpan?) { |
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val clickableSpanWithText = ClickableSpanWithText.ofSpan(textView, clickableSpan) |
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val handled = onLinkClickListener != null && onLinkClickListener!!.onClick( |
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textView, |
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clickableSpanWithText.text() |
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) |
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if (!handled) { |
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// Let Android handle this click. |
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clickableSpanWithText.span()!!.onClick(textView) |
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} |
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} |
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protected fun dispatchUrlLongClick(textView: TextView, clickableSpan: ClickableSpan?) { |
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val clickableSpanWithText = ClickableSpanWithText.ofSpan(textView, clickableSpan) |
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val handled = onLinkLongClickListener != null && onLinkLongClickListener!!.onLongClick( |
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textView, |
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clickableSpanWithText.text() |
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) |
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if (!handled) { |
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// Let Android handle this long click as a short-click. |
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clickableSpanWithText.span()!!.onClick(textView) |
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} |
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} |
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protected class LongPressTimer : Runnable { |
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private var onTimerReachedListener: OnTimerReachedListener? = null |
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interface OnTimerReachedListener { |
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fun onTimerReached() |
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} |
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override fun run() { |
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onTimerReachedListener!!.onTimerReached() |
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} |
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fun setOnTimerReachedListener(listener: OnTimerReachedListener?) { |
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onTimerReachedListener = listener |
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} |
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} |
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/** |
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* A wrapper to support all [ClickableSpan]s that may or may not provide URLs. |
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*/ |
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protected class ClickableSpanWithText protected constructor( |
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private val span: ClickableSpan?, |
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private val text: String |
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) { |
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fun span(): ClickableSpan? { |
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return span |
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} |
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fun text(): String { |
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return text |
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} |
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companion object { |
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fun ofSpan(textView: TextView, span: ClickableSpan?): ClickableSpanWithText { |
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val s = textView.text as Spanned |
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val text: String |
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text = if (span is URLSpan) { |
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span.url |
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} else { |
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val start = s.getSpanStart(span) |
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val end = s.getSpanEnd(span) |
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s.subSequence(start, end).toString() |
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} |
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return ClickableSpanWithText(span, text) |
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} |
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} |
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} |
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companion object { |
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private var singleInstance: BetterLinkMovementMethod? = null |
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private const val LINKIFY_NONE = -2 |
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/** |
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* Return a new instance of BetterLinkMovementMethod. |
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*/ |
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fun newInstance(): BetterLinkMovementMethod { |
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return BetterLinkMovementMethod() |
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} |
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|
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/** |
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* @param linkifyMask One of [Linkify.ALL], [Linkify.PHONE_NUMBERS], [Linkify.MAP_ADDRESSES], |
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* [Linkify.WEB_URLS] and [Linkify.EMAIL_ADDRESSES]. |
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* @param textViews The TextViews on which a [BetterLinkMovementMethod] should be registered. |
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* @return The registered [BetterLinkMovementMethod] on the TextViews. |
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*/ |
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fun linkify(linkifyMask: Int, vararg textViews: TextView): BetterLinkMovementMethod { |
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val movementMethod = newInstance() |
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for (textView in textViews) { |
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addLinks(linkifyMask, movementMethod, textView) |
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} |
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return movementMethod |
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} |
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/** |
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* Like [.linkify], but can be used for TextViews with HTML links. |
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* |
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* @param textViews The TextViews on which a [BetterLinkMovementMethod] should be registered. |
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* @return The registered [BetterLinkMovementMethod] on the TextViews. |
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*/ |
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fun linkifyHtml(vararg textViews: TextView): BetterLinkMovementMethod { |
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return linkify(LINKIFY_NONE, *textViews) |
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} |
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/** |
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* Recursively register a [BetterLinkMovementMethod] on every TextView inside a layout. |
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* |
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* @param linkifyMask One of [Linkify.ALL], [Linkify.PHONE_NUMBERS], [Linkify.MAP_ADDRESSES], |
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* [Linkify.WEB_URLS] and [Linkify.EMAIL_ADDRESSES]. |
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* @return The registered [BetterLinkMovementMethod] on the TextViews. |
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*/ |
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fun linkify(linkifyMask: Int, viewGroup: ViewGroup): BetterLinkMovementMethod { |
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val movementMethod = newInstance() |
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rAddLinks(linkifyMask, viewGroup, movementMethod) |
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return movementMethod |
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} |
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|
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/** |
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* Like [.linkify], but can be used for TextViews with HTML links. |
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* |
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* @return The registered [BetterLinkMovementMethod] on the TextViews. |
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*/ |
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fun linkifyHtml(viewGroup: ViewGroup): BetterLinkMovementMethod { |
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return linkify(LINKIFY_NONE, viewGroup) |
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} |
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|
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/** |
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* Recursively register a [BetterLinkMovementMethod] on every TextView inside a layout. |
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* |
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* @param linkifyMask One of [Linkify.ALL], [Linkify.PHONE_NUMBERS], [Linkify.MAP_ADDRESSES], |
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* [Linkify.WEB_URLS] and [Linkify.EMAIL_ADDRESSES]. |
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* @return The registered [BetterLinkMovementMethod] on the TextViews. |
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*/ |
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fun linkify(linkifyMask: Int, activity: Activity): BetterLinkMovementMethod { |
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// Find the layout passed to setContentView(). |
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val activityLayout = |
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(activity.findViewById<View>(Window.ID_ANDROID_CONTENT) as ViewGroup).getChildAt(0) as ViewGroup |
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val movementMethod = newInstance() |
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rAddLinks(linkifyMask, activityLayout, movementMethod) |
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return movementMethod |
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} |
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|
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/** |
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* Like [.linkify], but can be used for TextViews with HTML links. |
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* |
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* @return The registered [BetterLinkMovementMethod] on the TextViews. |
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*/ |
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fun linkifyHtml(activity: Activity): BetterLinkMovementMethod { |
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return linkify(LINKIFY_NONE, activity) |
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} |
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/** |
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* Get a static instance of BetterLinkMovementMethod. Do note that registering a click listener on the returned |
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* instance is not supported because it will potentially be shared on multiple TextViews. |
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*/ |
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val instance: BetterLinkMovementMethod? |
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get() { |
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if (singleInstance == null) { |
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singleInstance = BetterLinkMovementMethod() |
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} |
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return singleInstance |
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} |
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// ======== PUBLIC APIs END ======== // |
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private fun rAddLinks( |
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linkifyMask: Int, |
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viewGroup: ViewGroup, |
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movementMethod: BetterLinkMovementMethod |
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) { |
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for (i in 0 until viewGroup.childCount) { |
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val child = viewGroup.getChildAt(i) |
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if (child is ViewGroup) { |
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// Recursively find child TextViews. |
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rAddLinks(linkifyMask, child, movementMethod) |
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} else if (child is TextView) { |
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addLinks(linkifyMask, movementMethod, child) |
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} |
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} |
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} |
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private fun addLinks( |
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linkifyMask: Int, |
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movementMethod: BetterLinkMovementMethod, |
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textView: TextView |
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) { |
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textView.movementMethod = movementMethod |
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if (linkifyMask != LINKIFY_NONE) { |
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Linkify.addLinks(textView, linkifyMask) |
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} |
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} |
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} |
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} |
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