294 lines
9.5 KiB
Java
294 lines
9.5 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.text.method;
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import android.compat.annotation.UnsupportedAppUsage;
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import android.os.Build;
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import android.text.Layout;
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import android.text.NoCopySpan;
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import android.text.Selection;
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import android.text.Spannable;
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import android.text.style.ClickableSpan;
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import android.view.KeyEvent;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.textclassifier.TextLinks.TextLinkSpan;
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import android.widget.TextView;
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/**
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* A movement method that traverses links in the text buffer and scrolls if necessary.
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* Supports clicking on links with DPad Center or Enter.
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*/
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public class LinkMovementMethod extends ScrollingMovementMethod {
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private static final int CLICK = 1;
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private static final int UP = 2;
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private static final int DOWN = 3;
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private static final int HIDE_FLOATING_TOOLBAR_DELAY_MS = 200;
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@Override
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public boolean canSelectArbitrarily() {
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return true;
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}
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@Override
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protected boolean handleMovementKey(TextView widget, Spannable buffer, int keyCode,
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int movementMetaState, KeyEvent event) {
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switch (keyCode) {
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case KeyEvent.KEYCODE_DPAD_CENTER:
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case KeyEvent.KEYCODE_ENTER:
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if (KeyEvent.metaStateHasNoModifiers(movementMetaState)) {
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if (event.getAction() == KeyEvent.ACTION_DOWN &&
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event.getRepeatCount() == 0 && action(CLICK, widget, buffer)) {
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return true;
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}
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}
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break;
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}
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return super.handleMovementKey(widget, buffer, keyCode, movementMetaState, event);
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}
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@Override
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protected boolean up(TextView widget, Spannable buffer) {
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if (action(UP, widget, buffer)) {
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return true;
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}
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return super.up(widget, buffer);
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}
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@Override
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protected boolean down(TextView widget, Spannable buffer) {
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if (action(DOWN, widget, buffer)) {
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return true;
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}
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return super.down(widget, buffer);
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}
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@Override
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protected boolean left(TextView widget, Spannable buffer) {
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if (action(UP, widget, buffer)) {
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return true;
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}
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return super.left(widget, buffer);
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}
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@Override
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protected boolean right(TextView widget, Spannable buffer) {
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if (action(DOWN, widget, buffer)) {
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return true;
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}
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return super.right(widget, buffer);
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}
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private boolean action(int what, TextView widget, Spannable buffer) {
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Layout layout = widget.getLayout();
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if (widget.isOffsetMappingAvailable()) {
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// The text in the layout is transformed and has OffsetMapping, don't do anything.
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return false;
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}
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int padding = widget.getTotalPaddingTop() +
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widget.getTotalPaddingBottom();
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int areaTop = widget.getScrollY();
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int areaBot = areaTop + widget.getHeight() - padding;
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int lineTop = layout.getLineForVertical(areaTop);
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int lineBot = layout.getLineForVertical(areaBot);
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int first = layout.getLineStart(lineTop);
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int last = layout.getLineEnd(lineBot);
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ClickableSpan[] candidates = buffer.getSpans(first, last, ClickableSpan.class);
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int a = Selection.getSelectionStart(buffer);
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int b = Selection.getSelectionEnd(buffer);
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int selStart = Math.min(a, b);
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int selEnd = Math.max(a, b);
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if (selStart < 0) {
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if (buffer.getSpanStart(FROM_BELOW) >= 0) {
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selStart = selEnd = buffer.length();
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}
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}
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if (selStart > last)
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selStart = selEnd = Integer.MAX_VALUE;
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if (selEnd < first)
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selStart = selEnd = -1;
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switch (what) {
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case CLICK:
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if (selStart == selEnd) {
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return false;
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}
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ClickableSpan[] links = buffer.getSpans(selStart, selEnd, ClickableSpan.class);
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if (links.length != 1) {
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return false;
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}
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ClickableSpan link = links[0];
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if (link instanceof TextLinkSpan) {
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((TextLinkSpan) link).onClick(widget, TextLinkSpan.INVOCATION_METHOD_KEYBOARD);
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} else {
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link.onClick(widget);
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}
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break;
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case UP:
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int bestStart, bestEnd;
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bestStart = -1;
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bestEnd = -1;
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for (int i = 0; i < candidates.length; i++) {
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int end = buffer.getSpanEnd(candidates[i]);
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if (end < selEnd || selStart == selEnd) {
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if (end > bestEnd) {
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bestStart = buffer.getSpanStart(candidates[i]);
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bestEnd = end;
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}
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}
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}
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if (bestStart >= 0) {
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Selection.setSelection(buffer, bestEnd, bestStart);
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return true;
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}
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break;
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case DOWN:
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bestStart = Integer.MAX_VALUE;
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bestEnd = Integer.MAX_VALUE;
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for (int i = 0; i < candidates.length; i++) {
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int start = buffer.getSpanStart(candidates[i]);
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if (start > selStart || selStart == selEnd) {
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if (start < bestStart) {
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bestStart = start;
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bestEnd = buffer.getSpanEnd(candidates[i]);
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}
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}
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}
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if (bestEnd < Integer.MAX_VALUE) {
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Selection.setSelection(buffer, bestStart, bestEnd);
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return true;
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}
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break;
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}
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return false;
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}
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@Override
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public boolean onTouchEvent(TextView widget, Spannable buffer,
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MotionEvent event) {
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int action = event.getAction();
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if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_DOWN) {
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int x = (int) event.getX();
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int y = (int) event.getY();
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x -= widget.getTotalPaddingLeft();
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y -= widget.getTotalPaddingTop();
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x += widget.getScrollX();
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y += widget.getScrollY();
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Layout layout = widget.getLayout();
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ClickableSpan[] links;
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if (y < 0 || y > layout.getHeight()) {
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links = null;
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} else {
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int line = layout.getLineForVertical(y);
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if (x < layout.getLineLeft(line) || x > layout.getLineRight(line)) {
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links = null;
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} else {
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int off = layout.getOffsetForHorizontal(line, x);
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links = buffer.getSpans(off, off, ClickableSpan.class);
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}
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}
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if (links != null && links.length != 0) {
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ClickableSpan link = links[0];
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if (action == MotionEvent.ACTION_UP) {
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if (link instanceof TextLinkSpan) {
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((TextLinkSpan) link).onClick(
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widget, TextLinkSpan.INVOCATION_METHOD_TOUCH);
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} else {
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link.onClick(widget);
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}
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} else if (action == MotionEvent.ACTION_DOWN) {
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if (widget.getContext().getApplicationInfo().targetSdkVersion
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>= Build.VERSION_CODES.P) {
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// Selection change will reposition the toolbar. Hide it for a few ms for a
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// smoother transition.
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widget.hideFloatingToolbar(HIDE_FLOATING_TOOLBAR_DELAY_MS);
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}
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Selection.setSelection(buffer,
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buffer.getSpanStart(link),
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buffer.getSpanEnd(link));
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}
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return true;
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} else {
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Selection.removeSelection(buffer);
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}
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}
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return super.onTouchEvent(widget, buffer, event);
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}
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@Override
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public void initialize(TextView widget, Spannable text) {
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Selection.removeSelection(text);
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text.removeSpan(FROM_BELOW);
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}
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@Override
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public void onTakeFocus(TextView view, Spannable text, int dir) {
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Selection.removeSelection(text);
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if ((dir & View.FOCUS_BACKWARD) != 0) {
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text.setSpan(FROM_BELOW, 0, 0, Spannable.SPAN_POINT_POINT);
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} else {
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text.removeSpan(FROM_BELOW);
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}
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}
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public static MovementMethod getInstance() {
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if (sInstance == null)
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sInstance = new LinkMovementMethod();
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return sInstance;
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}
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@UnsupportedAppUsage
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private static LinkMovementMethod sInstance;
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private static Object FROM_BELOW = new NoCopySpan.Concrete();
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}
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