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authorThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:45 -0800
committerThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:45 -0800
commitd83a98f4ce9cfa908f5c54bbd70f03eec07e7553 (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /core/java/android/text/Selection.java
parent076357b8567458d4b6dfdcf839ef751634cd2bfb (diff)
auto import from //depot/cupcake/@135843
Diffstat (limited to 'core/java/android/text/Selection.java')
-rw-r--r--core/java/android/text/Selection.java429
1 files changed, 0 insertions, 429 deletions
diff --git a/core/java/android/text/Selection.java b/core/java/android/text/Selection.java
deleted file mode 100644
index bb98bce67cee..000000000000
--- a/core/java/android/text/Selection.java
+++ /dev/null
@@ -1,429 +0,0 @@
-/*
- * Copyright (C) 2006 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.text;
-
-
-/**
- * Utility class for manipulating cursors and selections in CharSequences.
- * A cursor is a selection where the start and end are at the same offset.
- */
-public class Selection {
- private Selection() { /* cannot be instantiated */ }
-
- /*
- * Retrieving the selection
- */
-
- /**
- * Return the offset of the selection anchor or cursor, or -1 if
- * there is no selection or cursor.
- */
- public static final int getSelectionStart(CharSequence text) {
- if (text instanceof Spanned)
- return ((Spanned) text).getSpanStart(SELECTION_START);
- else
- return -1;
- }
-
- /**
- * Return the offset of the selection edge or cursor, or -1 if
- * there is no selection or cursor.
- */
- public static final int getSelectionEnd(CharSequence text) {
- if (text instanceof Spanned)
- return ((Spanned) text).getSpanStart(SELECTION_END);
- else
- return -1;
- }
-
- /*
- * Setting the selection
- */
-
- // private static int pin(int value, int min, int max) {
- // return value < min ? 0 : (value > max ? max : value);
- // }
-
- /**
- * Set the selection anchor to <code>start</code> and the selection edge
- * to <code>stop</code>.
- */
- public static void setSelection(Spannable text, int start, int stop) {
- // int len = text.length();
- // start = pin(start, 0, len); XXX remove unless we really need it
- // stop = pin(stop, 0, len);
-
- int ostart = getSelectionStart(text);
- int oend = getSelectionEnd(text);
-
- if (ostart != start || oend != stop) {
- text.setSpan(SELECTION_START, start, start,
- Spanned.SPAN_POINT_POINT|Spanned.SPAN_INTERMEDIATE);
- text.setSpan(SELECTION_END, stop, stop,
- Spanned.SPAN_POINT_POINT);
- }
- }
-
- /**
- * Move the cursor to offset <code>index</code>.
- */
- public static final void setSelection(Spannable text, int index) {
- setSelection(text, index, index);
- }
-
- /**
- * Select the entire text.
- */
- public static final void selectAll(Spannable text) {
- setSelection(text, 0, text.length());
- }
-
- /**
- * Move the selection edge to offset <code>index</code>.
- */
- public static final void extendSelection(Spannable text, int index) {
- if (text.getSpanStart(SELECTION_END) != index)
- text.setSpan(SELECTION_END, index, index, Spanned.SPAN_POINT_POINT);
- }
-
- /**
- * Remove the selection or cursor, if any, from the text.
- */
- public static final void removeSelection(Spannable text) {
- text.removeSpan(SELECTION_START);
- text.removeSpan(SELECTION_END);
- }
-
- /*
- * Moving the selection within the layout
- */
-
- /**
- * Move the cursor to the buffer offset physically above the current
- * offset, or return false if the cursor is already on the top line.
- */
- public static boolean moveUp(Spannable text, Layout layout) {
- int start = getSelectionStart(text);
- int end = getSelectionEnd(text);
-
- if (start != end) {
- int min = Math.min(start, end);
- int max = Math.max(start, end);
-
- setSelection(text, min);
-
- if (min == 0 && max == text.length()) {
- return false;
- }
-
- return true;
- } else {
- int line = layout.getLineForOffset(end);
-
- if (line > 0) {
- int move;
-
- if (layout.getParagraphDirection(line) ==
- layout.getParagraphDirection(line - 1)) {
- float h = layout.getPrimaryHorizontal(end);
- move = layout.getOffsetForHorizontal(line - 1, h);
- } else {
- move = layout.getLineStart(line - 1);
- }
-
- setSelection(text, move);
- return true;
- }
- }
-
- return false;
- }
-
- /**
- * Move the cursor to the buffer offset physically below the current
- * offset, or return false if the cursor is already on the bottom line.
- */
- public static boolean moveDown(Spannable text, Layout layout) {
- int start = getSelectionStart(text);
- int end = getSelectionEnd(text);
-
- if (start != end) {
- int min = Math.min(start, end);
- int max = Math.max(start, end);
-
- setSelection(text, max);
-
- if (min == 0 && max == text.length()) {
- return false;
- }
-
- return true;
- } else {
- int line = layout.getLineForOffset(end);
-
- if (line < layout.getLineCount() - 1) {
- int move;
-
- if (layout.getParagraphDirection(line) ==
- layout.getParagraphDirection(line + 1)) {
- float h = layout.getPrimaryHorizontal(end);
- move = layout.getOffsetForHorizontal(line + 1, h);
- } else {
- move = layout.getLineStart(line + 1);
- }
-
- setSelection(text, move);
- return true;
- }
- }
-
- return false;
- }
-
- /**
- * Move the cursor to the buffer offset physically to the left of
- * the current offset, or return false if the cursor is already
- * at the left edge of the line and there is not another line to move it to.
- */
- public static boolean moveLeft(Spannable text, Layout layout) {
- int start = getSelectionStart(text);
- int end = getSelectionEnd(text);
-
- if (start != end) {
- setSelection(text, chooseHorizontal(layout, -1, start, end));
- return true;
- } else {
- int to = layout.getOffsetToLeftOf(end);
-
- if (to != end) {
- setSelection(text, to);
- return true;
- }
- }
-
- return false;
- }
-
- /**
- * Move the cursor to the buffer offset physically to the right of
- * the current offset, or return false if the cursor is already at
- * at the right edge of the line and there is not another line
- * to move it to.
- */
- public static boolean moveRight(Spannable text, Layout layout) {
- int start = getSelectionStart(text);
- int end = getSelectionEnd(text);
-
- if (start != end) {
- setSelection(text, chooseHorizontal(layout, 1, start, end));
- return true;
- } else {
- int to = layout.getOffsetToRightOf(end);
-
- if (to != end) {
- setSelection(text, to);
- return true;
- }
- }
-
- return false;
- }
-
- /**
- * Move the selection end to the buffer offset physically above
- * the current selection end.
- */
- public static boolean extendUp(Spannable text, Layout layout) {
- int end = getSelectionEnd(text);
- int line = layout.getLineForOffset(end);
-
- if (line > 0) {
- int move;
-
- if (layout.getParagraphDirection(line) ==
- layout.getParagraphDirection(line - 1)) {
- float h = layout.getPrimaryHorizontal(end);
- move = layout.getOffsetForHorizontal(line - 1, h);
- } else {
- move = layout.getLineStart(line - 1);
- }
-
- extendSelection(text, move);
- return true;
- } else if (end != 0) {
- extendSelection(text, 0);
- return true;
- }
-
- return true;
- }
-
- /**
- * Move the selection end to the buffer offset physically below
- * the current selection end.
- */
- public static boolean extendDown(Spannable text, Layout layout) {
- int end = getSelectionEnd(text);
- int line = layout.getLineForOffset(end);
-
- if (line < layout.getLineCount() - 1) {
- int move;
-
- if (layout.getParagraphDirection(line) ==
- layout.getParagraphDirection(line + 1)) {
- float h = layout.getPrimaryHorizontal(end);
- move = layout.getOffsetForHorizontal(line + 1, h);
- } else {
- move = layout.getLineStart(line + 1);
- }
-
- extendSelection(text, move);
- return true;
- } else if (end != text.length()) {
- extendSelection(text, text.length());
- return true;
- }
-
- return true;
- }
-
- /**
- * Move the selection end to the buffer offset physically to the left of
- * the current selection end.
- */
- public static boolean extendLeft(Spannable text, Layout layout) {
- int end = getSelectionEnd(text);
- int to = layout.getOffsetToLeftOf(end);
-
- if (to != end) {
- extendSelection(text, to);
- return true;
- }
-
- return true;
- }
-
- /**
- * Move the selection end to the buffer offset physically to the right of
- * the current selection end.
- */
- public static boolean extendRight(Spannable text, Layout layout) {
- int end = getSelectionEnd(text);
- int to = layout.getOffsetToRightOf(end);
-
- if (to != end) {
- extendSelection(text, to);
- return true;
- }
-
- return true;
- }
-
- public static boolean extendToLeftEdge(Spannable text, Layout layout) {
- int where = findEdge(text, layout, -1);
- extendSelection(text, where);
- return true;
- }
-
- public static boolean extendToRightEdge(Spannable text, Layout layout) {
- int where = findEdge(text, layout, 1);
- extendSelection(text, where);
- return true;
- }
-
- public static boolean moveToLeftEdge(Spannable text, Layout layout) {
- int where = findEdge(text, layout, -1);
- setSelection(text, where);
- return true;
- }
-
- public static boolean moveToRightEdge(Spannable text, Layout layout) {
- int where = findEdge(text, layout, 1);
- setSelection(text, where);
- return true;
- }
-
- private static int findEdge(Spannable text, Layout layout, int dir) {
- int pt = getSelectionEnd(text);
- int line = layout.getLineForOffset(pt);
- int pdir = layout.getParagraphDirection(line);
-
- if (dir * pdir < 0) {
- return layout.getLineStart(line);
- } else {
- int end = layout.getLineEnd(line);
-
- if (line == layout.getLineCount() - 1)
- return end;
- else
- return end - 1;
- }
- }
-
- private static int chooseHorizontal(Layout layout, int direction,
- int off1, int off2) {
- int line1 = layout.getLineForOffset(off1);
- int line2 = layout.getLineForOffset(off2);
-
- if (line1 == line2) {
- // same line, so it goes by pure physical direction
-
- float h1 = layout.getPrimaryHorizontal(off1);
- float h2 = layout.getPrimaryHorizontal(off2);
-
- if (direction < 0) {
- // to left
-
- if (h1 < h2)
- return off1;
- else
- return off2;
- } else {
- // to right
-
- if (h1 > h2)
- return off1;
- else
- return off2;
- }
- } else {
- // different line, so which line is "left" and which is "right"
- // depends upon the directionality of the text
-
- // This only checks at one end, but it's not clear what the
- // right thing to do is if the ends don't agree. Even if it
- // is wrong it should still not be too bad.
- int line = layout.getLineForOffset(off1);
- int textdir = layout.getParagraphDirection(line);
-
- if (textdir == direction)
- return Math.max(off1, off2);
- else
- return Math.min(off1, off2);
- }
- }
-
- private static final class START implements NoCopySpan { };
- private static final class END implements NoCopySpan { };
-
- /*
- * Public constants
- */
-
- public static final Object SELECTION_START = new START();
- public static final Object SELECTION_END = new END();
-}