| /* |
| * 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.widget; |
| |
| |
| import android.content.Context; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.accessibility.AccessibilityEvent; |
| import android.view.accessibility.AccessibilityNodeInfo; |
| |
| /** |
| * Specialized {@link android.widget.ViewSwitcher} that contains |
| * only children of type {@link android.widget.TextView}. |
| * |
| * A TextSwitcher is useful to animate a label on screen. Whenever |
| * {@link #setText(CharSequence)} is called, TextSwitcher animates the current text |
| * out and animates the new text in. |
| */ |
| public class TextSwitcher extends ViewSwitcher { |
| /** |
| * Creates a new empty TextSwitcher. |
| * |
| * @param context the application's environment |
| */ |
| public TextSwitcher(Context context) { |
| super(context); |
| } |
| |
| /** |
| * Creates a new empty TextSwitcher for the given context and with the |
| * specified set attributes. |
| * |
| * @param context the application environment |
| * @param attrs a collection of attributes |
| */ |
| public TextSwitcher(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @throws IllegalArgumentException if child is not an instance of |
| * {@link android.widget.TextView} |
| */ |
| @Override |
| public void addView(View child, int index, ViewGroup.LayoutParams params) { |
| if (!(child instanceof TextView)) { |
| throw new IllegalArgumentException( |
| "TextSwitcher children must be instances of TextView"); |
| } |
| |
| super.addView(child, index, params); |
| } |
| |
| /** |
| * Sets the text of the next view and switches to the next view. This can |
| * be used to animate the old text out and animate the next text in. |
| * |
| * @param text the new text to display |
| */ |
| public void setText(CharSequence text) { |
| final TextView t = (TextView) getNextView(); |
| t.setText(text); |
| showNext(); |
| } |
| |
| /** |
| * Sets the text of the text view that is currently showing. This does |
| * not perform the animations. |
| * |
| * @param text the new text to display |
| */ |
| public void setCurrentText(CharSequence text) { |
| ((TextView)getCurrentView()).setText(text); |
| } |
| |
| @Override |
| public void onInitializeAccessibilityEvent(AccessibilityEvent event) { |
| super.onInitializeAccessibilityEvent(event); |
| event.setClassName(TextSwitcher.class.getName()); |
| } |
| |
| @Override |
| public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { |
| super.onInitializeAccessibilityNodeInfo(info); |
| info.setClassName(TextSwitcher.class.getName()); |
| } |
| } |