/*
* Copyright (C) 2010 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.webkit;
import android.annotation.SystemApi;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Point;
import android.graphics.Rect;
import android.text.Editable;
import android.text.Selection;
import android.text.Spannable;
import android.text.TextWatcher;
import android.view.ActionMode;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
/**
* @hide
*/
@SystemApi
public class FindActionModeCallback implements ActionMode.Callback, TextWatcher,
View.OnClickListener, WebView.FindListener {
private View mCustomView;
private EditText mEditText;
private TextView mMatches;
private WebView mWebView;
private InputMethodManager mInput;
private Resources mResources;
private boolean mMatchesFound;
private int mNumberOfMatches;
private int mActiveMatchIndex;
private ActionMode mActionMode;
public FindActionModeCallback(Context context) {
mCustomView = LayoutInflater.from(context).inflate(
com.android.internal.R.layout.webview_find, null);
mEditText = (EditText) mCustomView.findViewById(
com.android.internal.R.id.edit);
mEditText.setCustomSelectionActionModeCallback(new NoAction());
mEditText.setOnClickListener(this);
setText("");
mMatches = (TextView) mCustomView.findViewById(
com.android.internal.R.id.matches);
mInput = (InputMethodManager)
context.getSystemService(Context.INPUT_METHOD_SERVICE);
mResources = context.getResources();
}
public void finish() {
mActionMode.finish();
}
/*
* Place text in the text field so it can be searched for. Need to press
* the find next or find previous button to find all of the matches.
*/
public void setText(String text) {
mEditText.setText(text);
Spannable span = (Spannable) mEditText.getText();
int length = span.length();
// Ideally, we would like to set the selection to the whole field,
// but this brings up the Text selection CAB, which dismisses this
// one.
Selection.setSelection(span, length, length);
// Necessary each time we set the text, so that this will watch
// changes to it.
span.setSpan(this, 0, length, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
mMatchesFound = false;
}
/*
* Set the WebView to search. Must be non null.
*/
public void setWebView(WebView webView) {
if (null == webView) {
throw new AssertionError("WebView supplied to "
+ "FindActionModeCallback cannot be null");
}
mWebView = webView;
mWebView.setFindDialogFindListener(this);
}
@Override
public void onFindResultReceived(int activeMatchOrdinal, int numberOfMatches,
boolean isDoneCounting) {
if (isDoneCounting) {
updateMatchCount(activeMatchOrdinal, numberOfMatches, numberOfMatches == 0);
}
}
/*
* Move the highlight to the next match.
* @param next If true, find the next match further down in the document.
* If false, find the previous match, up in the document.
*/
private void findNext(boolean next) {
if (mWebView == null) {
throw new AssertionError(
"No WebView for FindActionModeCallback::findNext");
}
if (!mMatchesFound) {
findAll();
return;
}
if (0 == mNumberOfMatches) {
// There are no matches, so moving to the next match will not do
// anything.
return;
}
mWebView.findNext(next);
updateMatchesString();
}
/*
* Highlight all the instances of the string from mEditText in mWebView.
*/
public void findAll() {
if (mWebView == null) {
throw new AssertionError(
"No WebView for FindActionModeCallback::findAll");
}
CharSequence find = mEditText.getText();
if (0 == find.length()) {
mWebView.clearMatches();
mMatches.setVisibility(View.GONE);
mMatchesFound = false;
mWebView.findAll(null);
} else {
mMatchesFound = true;
mMatches.setVisibility(View.INVISIBLE);
mNumberOfMatches = 0;
mWebView.findAllAsync(find.toString());
}
}
public void showSoftInput() {
mInput.startGettingWindowFocus(mEditText.getRootView());
mInput.focusIn(mEditText);
mInput.showSoftInput(mEditText, 0);
}
public void updateMatchCount(int matchIndex, int matchCount, boolean isEmptyFind) {
if (!isEmptyFind) {
mNumberOfMatches = matchCount;
mActiveMatchIndex = matchIndex;
updateMatchesString();
} else {
mMatches.setVisibility(View.GONE);
mNumberOfMatches = 0;
}
}
/*
* Update the string which tells the user how many matches were found, and
* which match is currently highlighted.
*/
private void updateMatchesString() {
if (mNumberOfMatches == 0) {
mMatches.setText(com.android.internal.R.string.no_matches);
} else {
mMatches.setText(mResources.getQuantityString(
com.android.internal.R.plurals.matches_found, mNumberOfMatches,
mActiveMatchIndex + 1, mNumberOfMatches));
}
mMatches.setVisibility(View.VISIBLE);
}
// OnClickListener implementation
@Override
public void onClick(View v) {
findNext(true);
}
// ActionMode.Callback implementation
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
if (!mode.isUiFocusable()) {
// If the action mode we're running in is not focusable the user
// will not be able to type into the find on page field. This
// should only come up when we're running in a dialog which is
// already less than ideal; disable the option for now.
return false;
}
mode.setCustomView(mCustomView);
mode.getMenuInflater().inflate(com.android.internal.R.menu.webview_find,
menu);
mActionMode = mode;
Editable edit = mEditText.getText();
Selection.setSelection(edit, edit.length());
mMatches.setVisibility(View.GONE);
mMatchesFound = false;
mMatches.setText("0");
mEditText.requestFocus();
return true;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
mActionMode = null;
mWebView.notifyFindDialogDismissed();
mWebView.setFindDialogFindListener(null);
mInput.hideSoftInputFromWindow(mWebView.getWindowToken(), 0);
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
if (mWebView == null) {
throw new AssertionError(
"No WebView for FindActionModeCallback::onActionItemClicked");
}
mInput.hideSoftInputFromWindow(mWebView.getWindowToken(), 0);
switch(item.getItemId()) {
case com.android.internal.R.id.find_prev:
findNext(false);
break;
case com.android.internal.R.id.find_next:
findNext(true);
break;
default:
return false;
}
return true;
}
// TextWatcher implementation
@Override
public void beforeTextChanged(CharSequence s,
int start,
int count,
int after) {
// Does nothing. Needed to implement TextWatcher.
}
@Override
public void onTextChanged(CharSequence s,
int start,
int before,
int count) {
findAll();
}
@Override
public void afterTextChanged(Editable s) {
// Does nothing. Needed to implement TextWatcher.
}
private Rect mGlobalVisibleRect = new Rect();
private Point mGlobalVisibleOffset = new Point();
public int getActionModeGlobalBottom() {
if (mActionMode == null) {
return 0;
}
View view = (View) mCustomView.getParent();
if (view == null) {
view = mCustomView;
}
view.getGlobalVisibleRect(mGlobalVisibleRect, mGlobalVisibleOffset);
return mGlobalVisibleRect.bottom;
}
public static class NoAction implements ActionMode.Callback {
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
return false;
}
@Override
public void onDestroyActionMode(ActionMode mode) {
}
}
}
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