92 lines
2.7 KiB
Java
92 lines
2.7 KiB
Java
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.widget;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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/**
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* Specialized {@link android.widget.ViewSwitcher} that contains
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* only children of type {@link android.widget.TextView}.
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*
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* A TextSwitcher is useful to animate a label on screen. Whenever
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* {@link #setText(CharSequence)} is called, TextSwitcher animates the current text
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* out and animates the new text in.
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*/
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public class TextSwitcher extends ViewSwitcher {
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/**
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* Creates a new empty TextSwitcher.
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*
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* @param context the application's environment
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*/
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public TextSwitcher(Context context) {
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super(context);
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}
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/**
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* Creates a new empty TextSwitcher for the given context and with the
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* specified set attributes.
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*
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* @param context the application environment
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* @param attrs a collection of attributes
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*/
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public TextSwitcher(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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/**
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* {@inheritDoc}
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*
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* @throws IllegalArgumentException if child is not an instance of
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* {@link android.widget.TextView}
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*/
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@Override
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public void addView(View child, int index, ViewGroup.LayoutParams params) {
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if (!(child instanceof TextView)) {
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throw new IllegalArgumentException(
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"TextSwitcher children must be instances of TextView");
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}
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super.addView(child, index, params);
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}
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/**
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* Sets the text of the next view and switches to the next view. This can
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* be used to animate the old text out and animate the next text in.
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*
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* @param text the new text to display
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*/
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public void setText(CharSequence text) {
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final TextView t = (TextView) getNextView();
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t.setText(text);
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showNext();
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}
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/**
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* Sets the text of the text view that is currently showing. This does
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* not perform the animations.
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*
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* @param text the new text to display
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*/
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public void setCurrentText(CharSequence text) {
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((TextView)getCurrentView()).setText(text);
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}
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}
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