389 lines
14 KiB
Java
389 lines
14 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.annotation.NonNull;
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import android.graphics.Rect;
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import android.text.Layout;
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import android.text.Selection;
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import android.text.Spannable;
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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.widget.TextView;
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/**
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* A movement method that provides cursor movement and selection.
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* Supports displaying the context menu on DPad Center.
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*/
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public class ArrowKeyMovementMethod extends BaseMovementMethod implements MovementMethod {
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private static boolean isSelecting(Spannable buffer) {
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return ((MetaKeyKeyListener.getMetaState(buffer, MetaKeyKeyListener.META_SHIFT_ON) == 1) ||
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(MetaKeyKeyListener.getMetaState(buffer, MetaKeyKeyListener.META_SELECTING) != 0));
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}
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private static int getCurrentLineTop(Spannable buffer, Layout layout) {
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return layout.getLineTop(layout.getLineForOffset(Selection.getSelectionEnd(buffer)));
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}
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private static int getPageHeight(TextView widget) {
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// This calculation does not take into account the view transformations that
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// may have been applied to the child or its containers. In case of scaling or
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// rotation, the calculated page height may be incorrect.
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final Rect rect = new Rect();
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return widget.getGlobalVisibleRect(rect) ? rect.height() : 0;
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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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if (KeyEvent.metaStateHasNoModifiers(movementMetaState)) {
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if (event.getAction() == KeyEvent.ACTION_DOWN
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&& event.getRepeatCount() == 0
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&& MetaKeyKeyListener.getMetaState(buffer,
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MetaKeyKeyListener.META_SELECTING, event) != 0) {
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return widget.showContextMenu();
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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 left(TextView widget, Spannable buffer) {
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if (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendLeft(buffer, layout);
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} else {
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return Selection.moveLeft(buffer, layout);
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}
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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 (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendRight(buffer, layout);
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} else {
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return Selection.moveRight(buffer, layout);
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}
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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 (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendUp(buffer, layout);
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} else {
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return Selection.moveUp(buffer, layout);
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}
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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 (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendDown(buffer, layout);
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} else {
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return Selection.moveDown(buffer, layout);
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}
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}
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@Override
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protected boolean pageUp(TextView widget, Spannable buffer) {
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if (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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final boolean selecting = isSelecting(buffer);
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final int targetY = getCurrentLineTop(buffer, layout) - getPageHeight(widget);
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boolean handled = false;
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for (;;) {
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final int previousSelectionEnd = Selection.getSelectionEnd(buffer);
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if (selecting) {
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Selection.extendUp(buffer, layout);
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} else {
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Selection.moveUp(buffer, layout);
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}
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if (Selection.getSelectionEnd(buffer) == previousSelectionEnd) {
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break;
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}
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handled = true;
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if (getCurrentLineTop(buffer, layout) <= targetY) {
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break;
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}
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}
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return handled;
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}
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@Override
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protected boolean pageDown(TextView widget, Spannable buffer) {
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if (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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final boolean selecting = isSelecting(buffer);
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final int targetY = getCurrentLineTop(buffer, layout) + getPageHeight(widget);
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boolean handled = false;
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for (;;) {
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final int previousSelectionEnd = Selection.getSelectionEnd(buffer);
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if (selecting) {
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Selection.extendDown(buffer, layout);
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} else {
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Selection.moveDown(buffer, layout);
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}
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if (Selection.getSelectionEnd(buffer) == previousSelectionEnd) {
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break;
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}
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handled = true;
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if (getCurrentLineTop(buffer, layout) >= targetY) {
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break;
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}
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}
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return handled;
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}
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@Override
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protected boolean top(TextView widget, Spannable buffer) {
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if (isSelecting(buffer)) {
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Selection.extendSelection(buffer, 0);
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} else {
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Selection.setSelection(buffer, 0);
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}
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return true;
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}
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@Override
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protected boolean bottom(TextView widget, Spannable buffer) {
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if (isSelecting(buffer)) {
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Selection.extendSelection(buffer, buffer.length());
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} else {
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Selection.setSelection(buffer, buffer.length());
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}
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return true;
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}
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@Override
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protected boolean lineStart(TextView widget, Spannable buffer) {
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if (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendToLeftEdge(buffer, layout);
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} else {
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return Selection.moveToLeftEdge(buffer, layout);
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}
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}
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@Override
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protected boolean lineEnd(TextView widget, Spannable buffer) {
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if (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendToRightEdge(buffer, layout);
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} else {
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return Selection.moveToRightEdge(buffer, layout);
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}
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}
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/** {@hide} */
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@Override
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protected boolean leftWord(TextView widget, Spannable buffer) {
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final int selectionEnd = widget.getSelectionEnd();
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final WordIterator wordIterator = widget.getWordIterator();
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wordIterator.setCharSequence(buffer, selectionEnd, selectionEnd);
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return Selection.moveToPreceding(buffer, wordIterator, isSelecting(buffer));
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}
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/** {@hide} */
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@Override
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protected boolean rightWord(TextView widget, Spannable buffer) {
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final int selectionEnd = widget.getSelectionEnd();
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final WordIterator wordIterator = widget.getWordIterator();
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wordIterator.setCharSequence(buffer, selectionEnd, selectionEnd);
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return Selection.moveToFollowing(buffer, wordIterator, isSelecting(buffer));
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}
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@Override
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protected boolean home(TextView widget, Spannable buffer) {
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return lineStart(widget, buffer);
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}
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@Override
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protected boolean end(TextView widget, Spannable buffer) {
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return lineEnd(widget, buffer);
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}
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@Override
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public boolean previousParagraph(@NonNull TextView widget, @NonNull Spannable buffer) {
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if (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendToParagraphStart(buffer);
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} else {
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return Selection.moveToParagraphStart(buffer, layout);
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}
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}
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@Override
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public boolean nextParagraph(@NonNull TextView widget, @NonNull Spannable buffer) {
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if (widget.isOffsetMappingAvailable()) {
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return false;
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}
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final Layout layout = widget.getLayout();
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if (isSelecting(buffer)) {
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return Selection.extendToParagraphEnd(buffer);
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} else {
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return Selection.moveToParagraphEnd(buffer, layout);
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}
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}
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@Override
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public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
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int initialScrollX = -1;
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int initialScrollY = -1;
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final int action = event.getAction();
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if (action == MotionEvent.ACTION_UP) {
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initialScrollX = Touch.getInitialScrollX(widget, buffer);
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initialScrollY = Touch.getInitialScrollY(widget, buffer);
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}
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boolean wasTouchSelecting = isSelecting(buffer);
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boolean handled = Touch.onTouchEvent(widget, buffer, event);
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if (widget.didTouchFocusSelect()) {
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return handled;
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}
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if (action == MotionEvent.ACTION_DOWN) {
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// For touch events, the code should run only when selection is active.
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if (isSelecting(buffer)) {
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if (!widget.isFocused()) {
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if (!widget.requestFocus()) {
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return handled;
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}
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}
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int offset = widget.getOffsetForPosition(event.getX(), event.getY());
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buffer.setSpan(LAST_TAP_DOWN, offset, offset, Spannable.SPAN_POINT_POINT);
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// Disallow intercepting of the touch events, so that
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// users can scroll and select at the same time.
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// without this, users would get booted out of select
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// mode once the view detected it needed to scroll.
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widget.getParent().requestDisallowInterceptTouchEvent(true);
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}
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} else if (widget.isFocused()) {
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if (action == MotionEvent.ACTION_MOVE) {
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if (isSelecting(buffer) && handled) {
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final int startOffset = buffer.getSpanStart(LAST_TAP_DOWN);
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// Before selecting, make sure we've moved out of the "slop".
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// handled will be true, if we're in select mode AND we're
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// OUT of the slop
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// Turn long press off while we're selecting. User needs to
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// re-tap on the selection to enable long press
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widget.cancelLongPress();
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// Update selection as we're moving the selection area.
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// Get the current touch position
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final int offset = widget.getOffsetForPosition(event.getX(), event.getY());
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Selection.setSelection(buffer, Math.min(startOffset, offset),
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Math.max(startOffset, offset));
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return true;
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}
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} else if (action == MotionEvent.ACTION_UP) {
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// If we have scrolled, then the up shouldn't move the cursor,
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// but we do need to make sure the cursor is still visible at
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// the current scroll offset to avoid the scroll jumping later
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// to show it.
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if ((initialScrollY >= 0 && initialScrollY != widget.getScrollY()) ||
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(initialScrollX >= 0 && initialScrollX != widget.getScrollX())) {
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widget.moveCursorToVisibleOffset();
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return true;
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}
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if (wasTouchSelecting) {
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final int startOffset = buffer.getSpanStart(LAST_TAP_DOWN);
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final int endOffset = widget.getOffsetForPosition(event.getX(), event.getY());
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Selection.setSelection(buffer, Math.min(startOffset, endOffset),
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Math.max(startOffset, endOffset));
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buffer.removeSpan(LAST_TAP_DOWN);
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}
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MetaKeyKeyListener.adjustMetaAfterKeypress(buffer);
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MetaKeyKeyListener.resetLockedMeta(buffer);
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return true;
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}
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}
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return handled;
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}
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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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public void initialize(TextView widget, Spannable text) {
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Selection.setSelection(text, 0);
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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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if ((dir & (View.FOCUS_FORWARD | View.FOCUS_DOWN)) != 0) {
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if (view.getLayout() == null) {
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// This shouldn't be null, but do something sensible if it is.
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Selection.setSelection(text, text.length());
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}
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} else {
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Selection.setSelection(text, text.length());
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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 ArrowKeyMovementMethod();
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}
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return sInstance;
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}
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private static final Object LAST_TAP_DOWN = new Object();
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private static ArrowKeyMovementMethod sInstance;
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}
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