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/*
* Copyright (C) 2008 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.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnLongClickListener;
/**
* This widget provides a simple utility for turning a continued long-press event
* into a series of clicks at some set frequency. There is no actual 'zoom' functionality
* handled by this widget directly. Instead, clients of this API should set up an
* {@link View#setOnClickListener(OnClickListener) onClickListener} to handle
* zoom functionality. That click listener is called on a frequency
* determined by {@link #setZoomSpeed(long)} whenever the user long-presses
* on the ZoomButton.
*
* @deprecated Use other means to handle this functionality. This widget is merely a
* simple wrapper around a long-press handler.
*/
@Deprecated
public class ZoomButton extends ImageButton implements OnLongClickListener {
private final Runnable mRunnable = new Runnable() {
public void run() {
if (hasOnClickListeners() && mIsInLongpress && isEnabled()) {
callOnClick();
postDelayed(this, mZoomSpeed);
}
}
};
private long mZoomSpeed = 1000;
private boolean mIsInLongpress;
public ZoomButton(Context context) {
this(context, null);
}
public ZoomButton(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ZoomButton(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public ZoomButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
setOnLongClickListener(this);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if ((event.getAction() == MotionEvent.ACTION_CANCEL)
|| (event.getAction() == MotionEvent.ACTION_UP)) {
mIsInLongpress = false;
}
return super.onTouchEvent(event);
}
/**
* Sets the delay between calls to the widget's {@link View#setOnClickListener(OnClickListener)
* onClickListener}.
*
* @param speed The delay between calls to the click listener, in milliseconds
*/
public void setZoomSpeed(long speed) {
mZoomSpeed = speed;
}
@Override
public boolean onLongClick(View v) {
mIsInLongpress = true;
post(mRunnable);
return true;
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
mIsInLongpress = false;
return super.onKeyUp(keyCode, event);
}
@Override
public void setEnabled(boolean enabled) {
if (!enabled) {
/* If we're being disabled reset the state back to unpressed
* as disabled views don't get events and therefore we won't
* get the up event to reset the state.
*/
setPressed(false);
}
super.setEnabled(enabled);
}
@Override
public boolean dispatchUnhandledMove(View focused, int direction) {
clearFocus();
return super.dispatchUnhandledMove(focused, direction);
}
@Override
public CharSequence getAccessibilityClassName() {
return ZoomButton.class.getName();
}
}
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