package org.aisen.wen.support.textspan;
import android.os.Handler;
import android.text.Layout;
import android.text.NoCopySpan;
import android.text.Selection;
import android.text.Spannable;
import android.text.method.MovementMethod;
import android.text.method.ScrollingMovementMethod;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.TextView;
import org.aisen.wen.support.utils.Logger;
/**
* support long click
* <p/>
* A movement method that traverses links in the text buffer and scrolls if
* necessary. Supports clicking on links with DPad Center or Enter.
*/
public class MyLinkMovementMethod extends ScrollingMovementMethod {
private static final int CLICK = 1;
private static final int UP = 2;
private static final int DOWN = 3;
private boolean mHasPerformedLongPress;
private CheckForLongPress mPendingCheckForLongPress;
private boolean pressed;
@Override
protected boolean handleMovementKey(TextView widget, Spannable buffer, int keyCode, int movementMetaState, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_ENTER:
if (KeyEvent.metaStateHasNoModifiers(movementMetaState)) {
if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0 && action(CLICK, widget, buffer)) {
return true;
}
}
break;
}
return super.handleMovementKey(widget, buffer, keyCode, movementMetaState, event);
}
@Override
protected boolean up(TextView widget, Spannable buffer) {
if (action(UP, widget, buffer)) {
return true;
}
return super.up(widget, buffer);
}
@Override
protected boolean down(TextView widget, Spannable buffer) {
if (action(DOWN, widget, buffer)) {
return true;
}
return super.down(widget, buffer);
}
@Override
protected boolean left(TextView widget, Spannable buffer) {
if (action(UP, widget, buffer)) {
return true;
}
return super.left(widget, buffer);
}
@Override
protected boolean right(TextView widget, Spannable buffer) {
if (action(DOWN, widget, buffer)) {
return true;
}
return super.right(widget, buffer);
}
private boolean action(int what, TextView widget, Spannable buffer) {
Layout layout = widget.getLayout();
int padding = widget.getTotalPaddingTop() + widget.getTotalPaddingBottom();
int areatop = widget.getScrollY();
int areabot = areatop + widget.getHeight() - padding;
int linetop = layout.getLineForVertical(areatop);
int linebot = layout.getLineForVertical(areabot);
int first = layout.getLineStart(linetop);
int last = layout.getLineEnd(linebot);
MyURLSpan[] candidates = buffer.getSpans(first, last, MyURLSpan.class);
int a = Selection.getSelectionStart(buffer);
int b = Selection.getSelectionEnd(buffer);
int selStart = Math.min(a, b);
int selEnd = Math.max(a, b);
if (selStart < 0) {
if (buffer.getSpanStart(FROM_BELOW) >= 0) {
selStart = selEnd = buffer.length();
}
}
if (selStart > last)
selStart = selEnd = Integer.MAX_VALUE;
if (selEnd < first)
selStart = selEnd = -1;
switch (what) {
case CLICK:
if (selStart == selEnd) {
return false;
}
MyURLSpan[] link = buffer.getSpans(selStart, selEnd, MyURLSpan.class);
if (link.length != 1)
return false;
link[0].onClick(widget);
break;
case UP:
int beststart,
bestend;
beststart = -1;
bestend = -1;
for (int i = 0; i < candidates.length; i++) {
int end = buffer.getSpanEnd(candidates[i]);
if (end < selEnd || selStart == selEnd) {
if (end > bestend) {
beststart = buffer.getSpanStart(candidates[i]);
bestend = end;
}
}
}
if (beststart >= 0) {
Selection.setSelection(buffer, bestend, beststart);
return true;
}
break;
case DOWN:
beststart = Integer.MAX_VALUE;
bestend = Integer.MAX_VALUE;
for (int i = 0; i < candidates.length; i++) {
int start = buffer.getSpanStart(candidates[i]);
if (start > selStart || selStart == selEnd) {
if (start < beststart) {
beststart = start;
bestend = buffer.getSpanEnd(candidates[i]);
}
}
}
if (bestend < Integer.MAX_VALUE) {
Selection.setSelection(buffer, beststart, bestend);
return true;
}
break;
}
return false;
}
@Override
public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_DOWN) {
Logger.e("OnTouchListener--->" + "MyLinkMoveMentMethod");
int x = (int) event.getX();
int y = (int) event.getY();
x -= widget.getTotalPaddingLeft();
y -= widget.getTotalPaddingTop();
x += widget.getScrollX();
y += widget.getScrollY();
Layout layout = widget.getLayout();
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line, x);
MyURLSpan[] link = buffer.getSpans(off, off, MyURLSpan.class);
if (link.length != 0) {
if (action == MotionEvent.ACTION_UP) {
if (!mHasPerformedLongPress) {
link[0].onClick(widget);
}
pressed = false;
} else if (action == MotionEvent.ACTION_DOWN) {
pressed = true;
checkForLongClick(link, widget);
Selection.setSelection(buffer, buffer.getSpanStart(link[0]), buffer.getSpanEnd(link[0]));
}
return true;
} else {
Selection.removeSelection(buffer);
}
}
if (action == MotionEvent.ACTION_MOVE) {
pressed = false;
}
return super.onTouchEvent(widget, buffer, event);
}
private void checkForLongClick(MyURLSpan[] spans, View widget) {
mHasPerformedLongPress = false;
mPendingCheckForLongPress = new CheckForLongPress(spans, widget);
new Handler().postDelayed(mPendingCheckForLongPress, ViewConfiguration.getLongPressTimeout());
}
class CheckForLongPress implements Runnable {
MyURLSpan[] spans;
View widget;
public CheckForLongPress(MyURLSpan[] spans, View widget) {
this.spans = spans;
this.widget = widget;
}
public void run() {
if (isPressed()) {
spans[0].onLongClick(widget);
mHasPerformedLongPress = true;
}
}
}
private void performLongClick() {
}
public boolean isPressed() {
return pressed;
}
@Override
public void initialize(TextView widget, Spannable text) {
Selection.removeSelection(text);
text.removeSpan(FROM_BELOW);
}
@Override
public void onTakeFocus(TextView view, Spannable text, int dir) {
Selection.removeSelection(text);
if ((dir & View.FOCUS_BACKWARD) != 0) {
text.setSpan(FROM_BELOW, 0, 0, Spannable.SPAN_POINT_POINT);
} else {
text.removeSpan(FROM_BELOW);
}
}
public static MovementMethod getInstance() {
if (sInstance == null)
sInstance = new MyLinkMovementMethod();
return sInstance;
}
private static MyLinkMovementMethod sInstance;
private static Object FROM_BELOW = new NoCopySpan.Concrete();
}