FindActionModeCallback.java revision f8419a0299680ed580975b0fcb758990b4367db8 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.webkit;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.text.Editable;
22import android.text.Selection;
23import android.text.Spannable;
24import android.text.TextWatcher;
25import android.webkit.WebView;
26import android.widget.EditText;
27import android.widget.TextView;
28import android.view.ActionMode;
29import android.view.LayoutInflater;
30import android.view.Menu;
31import android.view.MenuInflater;
32import android.view.MenuItem;
33import android.view.View;
34import android.view.inputmethod.InputMethodManager;
35
36class FindActionModeCallback implements ActionMode.Callback, TextWatcher,
37        View.OnLongClickListener, View.OnClickListener {
38    private View mCustomView;
39    private EditText mEditText;
40    private TextView mMatches;
41    private WebView mWebView;
42    private InputMethodManager mInput;
43    private Resources mResources;
44    private boolean mMatchesFound;
45    private int mNumberOfMatches;
46    private ActionMode mActionMode;
47
48    FindActionModeCallback(Context context) {
49        mCustomView = LayoutInflater.from(context).inflate(
50                com.android.internal.R.layout.webview_find, null);
51        mEditText = (EditText) mCustomView.findViewById(
52                com.android.internal.R.id.edit);
53        // Override long click so that select ActionMode is not opened, which
54        // would exit find ActionMode.
55        mEditText.setOnLongClickListener(this);
56        mEditText.setOnClickListener(this);
57        setText("");
58        mMatches = (TextView) mCustomView.findViewById(
59                com.android.internal.R.id.matches);
60        mInput = (InputMethodManager)
61                context.getSystemService(Context.INPUT_METHOD_SERVICE);
62        mResources = context.getResources();
63    }
64
65    void finish() {
66        mActionMode.finish();
67    }
68
69    /*
70     * Place text in the text field so it can be searched for.  Need to press
71     * the find next or find previous button to find all of the matches.
72     */
73    void setText(String text) {
74        mEditText.setText(text);
75        Spannable span = (Spannable) mEditText.getText();
76        int length = span.length();
77        // Ideally, we would like to set the selection to the whole field,
78        // but this brings up the Text selection CAB, which dismisses this
79        // one.
80        Selection.setSelection(span, length, length);
81        // Necessary each time we set the text, so that this will watch
82        // changes to it.
83        span.setSpan(this, 0, length, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
84        mMatchesFound = false;
85    }
86
87    /*
88     * Set the WebView to search.  Must be non null, and set before calling
89     * startActionMode.
90     */
91    void setWebView(WebView webView) {
92        if (null == webView) {
93            throw new AssertionError("WebView supplied to "
94                    + "FindActionModeCallback cannot be null");
95        }
96        mWebView = webView;
97    }
98
99    /*
100     * Move the highlight to the next match.
101     * @param next If true, find the next match further down in the document.
102     *             If false, find the previous match, up in the document.
103     */
104    private void findNext(boolean next) {
105        if (mWebView == null) {
106            throw new AssertionError(
107                    "No WebView for FindActionModeCallback::findNext");
108        }
109        if (!mMatchesFound) {
110            findAll();
111            return;
112        }
113        if (0 == mNumberOfMatches) {
114            // There are no matches, so moving to the next match will not do
115            // anything.
116            return;
117        }
118        mWebView.findNext(next);
119        updateMatchesString();
120    }
121
122    /*
123     * Highlight all the instances of the string from mEditText in mWebView.
124     */
125    void findAll() {
126        if (mWebView == null) {
127            throw new AssertionError(
128                    "No WebView for FindActionModeCallback::findAll");
129        }
130        CharSequence find = mEditText.getText();
131        if (0 == find.length()) {
132            mWebView.clearMatches();
133            mMatches.setVisibility(View.GONE);
134            mMatchesFound = false;
135        } else {
136            mMatchesFound = true;
137            mMatches.setVisibility(View.VISIBLE);
138            mNumberOfMatches = mWebView.findAll(find.toString());
139            if (0 == mNumberOfMatches) {
140                mMatches.setText(mResources.getString(
141                        com.android.internal.R.string.no_matches));
142            } else {
143                updateMatchesString();
144            }
145        }
146    }
147
148    public void showSoftInput() {
149        mInput.startGettingWindowFocus(mEditText.getRootView());
150        mInput.focusIn(mEditText);
151        mInput.showSoftInput(mEditText, 0);
152    }
153
154    /*
155     * Update the string which tells the user how many matches were found, and
156     * which match is currently highlighted.
157     * Not to be called when mNumberOfMatches is 0.
158     */
159    private void updateMatchesString() {
160        String template = mResources.getQuantityString(
161                com.android.internal.R.plurals.matches_found, mNumberOfMatches,
162                mWebView.findIndex() + 1, mNumberOfMatches);
163
164        mMatches.setText(template);
165    }
166
167    // OnLongClickListener implementation
168
169    @Override
170    public boolean onLongClick(View v) { return true; }
171
172    // OnClickListener implementation
173
174    @Override
175    public void onClick(View v) {
176        findNext(true);
177    }
178
179    // ActionMode.Callback implementation
180
181    @Override
182    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
183        if (!mode.isUiFocusable()) {
184            // If the action mode we're running in is not focusable the user
185            // will not be able to type into the find on page field. This
186            // should only come up when we're running in a dialog which is
187            // already less than ideal; disable the option for now.
188            return false;
189        }
190
191        mode.setCustomView(mCustomView);
192        mode.getMenuInflater().inflate(com.android.internal.R.menu.webview_find,
193                menu);
194        mActionMode = mode;
195        Editable edit = mEditText.getText();
196        Selection.setSelection(edit, edit.length());
197        mMatches.setVisibility(View.GONE);
198        mMatchesFound = false;
199        mMatches.setText("0");
200        mEditText.requestFocus();
201        return true;
202    }
203
204    @Override
205    public void onDestroyActionMode(ActionMode mode) {
206        mWebView.notifyFindDialogDismissed();
207        mInput.hideSoftInputFromWindow(mWebView.getWindowToken(), 0);
208    }
209
210    @Override
211    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
212        return false;
213    }
214
215    @Override
216    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
217        if (mWebView == null) {
218            throw new AssertionError(
219                    "No WebView for FindActionModeCallback::onActionItemClicked");
220        }
221        mInput.hideSoftInputFromWindow(mWebView.getWindowToken(), 0);
222        switch(item.getItemId()) {
223            case com.android.internal.R.id.find_prev:
224                findNext(false);
225                break;
226            case com.android.internal.R.id.find_next:
227                findNext(true);
228                break;
229            default:
230                return false;
231        }
232        return true;
233    }
234
235    // TextWatcher implementation
236
237    @Override
238    public void beforeTextChanged(CharSequence s,
239                                  int start,
240                                  int count,
241                                  int after) {
242        // Does nothing.  Needed to implement TextWatcher.
243    }
244
245    @Override
246    public void onTextChanged(CharSequence s,
247                              int start,
248                              int before,
249                              int count) {
250        findAll();
251    }
252
253    @Override
254    public void afterTextChanged(Editable s) {
255        // Does nothing.  Needed to implement TextWatcher.
256    }
257
258}
259