Touch.java revision 70a6312f09329bd0b19343bc7906f9ce665fe3ad
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.text.method; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.text.Layout; 20cc3ec6cdb2b892eb29513e72d8b205acbe997b25Gilles Debunneimport android.text.Layout.Alignment; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.text.NoCopySpan; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.text.Spannable; 23c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Feltimport android.view.KeyEvent; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.widget.TextView; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class Touch { 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private Touch() { } 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the specified widget to the specified coordinates, except 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * constrains the X scrolling position to the horizontal regions of 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the text that will be visible after scrolling to the specified 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Y position. 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static void scrollTo(TextView widget, Layout layout, int x, int y) { 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int padding = widget.getTotalPaddingTop() + 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widget.getTotalPaddingBottom(); 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int top = layout.getLineForVertical(y); 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int bottom = layout.getLineForVertical(y + widget.getHeight() - 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project padding); 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int left = Integer.MAX_VALUE; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int right = 0; 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Alignment a = null; 47c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt boolean ltr = true; 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = top; i <= bottom; i++) { 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project left = (int) Math.min(left, layout.getLineLeft(i)); 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project right = (int) Math.max(right, layout.getLineRight(i)); 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (a == null) { 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a = layout.getParagraphAlignment(i); 55c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt ltr = layout.getParagraphDirection(i) > 0; 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project padding = widget.getTotalPaddingLeft() + widget.getTotalPaddingRight(); 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = widget.getWidth(); 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int diff = 0; 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 63c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt // align_opposite does NOT mean align_right, we need the paragraph 64c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt // direction to resolve it to left or right 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (right - left < width - padding) { 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (a == Alignment.ALIGN_CENTER) { 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project diff = (width - padding - (right - left)) / 2; 68c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt } else if (ltr == (a == Alignment.ALIGN_OPPOSITE)) { 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project diff = width - padding - (right - left); 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = Math.min(x, right - (width - padding) - diff); 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = Math.max(x, left - diff); 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widget.scrollTo(x, y); 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handles touch events for dragging. You may want to do other actions 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * like moving the cursor on touch as well. 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean onTouchEvent(TextView widget, Spannable buffer, 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project MotionEvent event) { 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project DragState[] ds; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 87cc3ec6cdb2b892eb29513e72d8b205acbe997b25Gilles Debunne switch (event.getActionMasked()) { 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_DOWN: 8958b971d733a2c700cabd3db02b6ea4d5faca6939Eric Fischer ds = buffer.getSpans(0, buffer.length(), DragState.class); 9058b971d733a2c700cabd3db02b6ea4d5faca6939Eric Fischer 9158b971d733a2c700cabd3db02b6ea4d5faca6939Eric Fischer for (int i = 0; i < ds.length; i++) { 9258b971d733a2c700cabd3db02b6ea4d5faca6939Eric Fischer buffer.removeSpan(ds[i]); 9358b971d733a2c700cabd3db02b6ea4d5faca6939Eric Fischer } 9458b971d733a2c700cabd3db02b6ea4d5faca6939Eric Fischer 9538e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn buffer.setSpan(new DragState(event.getX(), event.getY(), 9638e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn widget.getScrollX(), widget.getScrollY()), 9738e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn 0, 0, Spannable.SPAN_MARK_MARK); 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ds = buffer.getSpans(0, buffer.length(), DragState.class); 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < ds.length; i++) { 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project buffer.removeSpan(ds[i]); 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ds.length > 0 && ds[0].mUsed) { 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ds = buffer.getSpans(0, buffer.length(), DragState.class); 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ds.length > 0) { 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ds[0].mFarEnough == false) { 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int slop = ViewConfiguration.get(widget.getContext()).getScaledTouchSlop(); 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (Math.abs(event.getX() - ds[0].mX) >= slop || 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Math.abs(event.getY() - ds[0].mY) >= slop) { 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ds[0].mFarEnough = true; 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ds[0].mFarEnough) { 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ds[0].mUsed = true; 1286b53e8daa69cba1a2a5a7c95a01e37ce9c53226cJeff Brown boolean cap = (event.getMetaState() & KeyEvent.META_SHIFT_ON) != 0 1296b53e8daa69cba1a2a5a7c95a01e37ce9c53226cJeff Brown || MetaKeyKeyListener.getMetaState(buffer, 1306b53e8daa69cba1a2a5a7c95a01e37ce9c53226cJeff Brown MetaKeyKeyListener.META_SHIFT_ON) == 1 1316b53e8daa69cba1a2a5a7c95a01e37ce9c53226cJeff Brown || MetaKeyKeyListener.getMetaState(buffer, 1326b53e8daa69cba1a2a5a7c95a01e37ce9c53226cJeff Brown MetaKeyKeyListener.META_SELECTING) != 0; 133ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett float dx; 134ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett float dy; 135ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett if (cap) { 136ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett // if we're selecting, we want the scroll to go in 137ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett // the direction of the drag 138ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett dx = event.getX() - ds[0].mX; 139ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett dy = event.getY() - ds[0].mY; 140ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett } else { 141ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett dx = ds[0].mX - event.getX(); 142ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett dy = ds[0].mY - event.getY(); 143ab9289320f598509cf358523ba173d69178a55eaMaryam Garrett } 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ds[0].mX = event.getX(); 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ds[0].mY = event.getY(); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nx = widget.getScrollX() + (int) dx; 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int ny = widget.getScrollY() + (int) dy; 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15070a6312f09329bd0b19343bc7906f9ce665fe3adGilles Debunne int padding = widget.getTotalPaddingTop() + widget.getTotalPaddingBottom(); 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Layout layout = widget.getLayout(); 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15370a6312f09329bd0b19343bc7906f9ce665fe3adGilles Debunne ny = Math.min(ny, layout.getHeight() - (widget.getHeight() - padding)); 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ny = Math.max(ny, 0); 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15627d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn int oldX = widget.getScrollX(); 15727d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn int oldY = widget.getScrollY(); 15827d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(widget, layout, nx, ny); 16027d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn 16127d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn // If we actually scrolled, then cancel the up action. 16270a6312f09329bd0b19343bc7906f9ce665fe3adGilles Debunne if (oldX != widget.getScrollX() || oldY != widget.getScrollY()) { 16327d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn widget.cancelLongPress(); 16427d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn } 16527d377221c7970a5205c83f8a9f62f755dc1fa5dDianne Hackborn 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 17438e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn public static int getInitialScrollX(TextView widget, Spannable buffer) { 17538e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn DragState[] ds = buffer.getSpans(0, buffer.length(), DragState.class); 17638e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn return ds.length > 0 ? ds[0].mScrollX : -1; 17738e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn } 17838e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn 17938e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn public static int getInitialScrollY(TextView widget, Spannable buffer) { 18038e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn DragState[] ds = buffer.getSpans(0, buffer.length(), DragState.class); 18138e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn return ds.length > 0 ? ds[0].mScrollY : -1; 18238e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn } 18338e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static class DragState implements NoCopySpan { 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float mX; 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float mY; 18738e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn public int mScrollX; 18838e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn public int mScrollY; 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean mFarEnough; 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean mUsed; 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 19238e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn public DragState(float x, float y, int scrollX, int scrollY) { 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mX = x; 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mY = y; 19538e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn mScrollX = scrollX; 19638e98fccfab9592f871f3066f8569c559f1ee226Dianne Hackborn mScrollY = scrollY; 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 200