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/*
* Copyright 2014, 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 com.example.android.floatingactionbuttonbasic;
import android.content.Context;
import android.graphics.Outline;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewOutlineProvider;
import android.widget.Checkable;
import android.widget.FrameLayout;
/**
* A Floating Action Button is a {@link android.widget.Checkable} view distinguished by a circled
* icon floating above the UI, with special motion behaviors.
*/
public class FloatingActionButton extends FrameLayout implements Checkable {
/**
* Interface definition for a callback to be invoked when the checked state
* of a compound button changes.
*/
public static interface OnCheckedChangeListener {
/**
* Called when the checked state of a FAB has changed.
*
* @param fabView The FAB view whose state has changed.
* @param isChecked The new checked state of buttonView.
*/
void onCheckedChanged(FloatingActionButton fabView, boolean isChecked);
}
/**
* An array of states.
*/
private static final int[] CHECKED_STATE_SET = {
android.R.attr.state_checked
};
private static final String TAG = "FloatingActionButton";
// A boolean that tells if the FAB is checked or not.
private boolean mChecked;
// A listener to communicate that the FAB has changed it's state
private OnCheckedChangeListener mOnCheckedChangeListener;
public FloatingActionButton(Context context) {
this(context, null, 0, 0);
}
public FloatingActionButton(Context context, AttributeSet attrs) {
this(context, attrs, 0, 0);
}
public FloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public FloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr);
setClickable(true);
// Set the outline provider for this view. The provider is given the outline which it can
// then modify as needed. In this case we set the outline to be an oval fitting the height
// and width.
setOutlineProvider(new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
outline.setOval(0, 0, getWidth(), getHeight());
}
});
// Finally, enable clipping to the outline, using the provider we set above
setClipToOutline(true);
}
/**
* Sets the checked/unchecked state of the FAB.
* @param checked
*/
public void setChecked(boolean checked) {
// If trying to set the current state, ignore.
if (checked == mChecked) {
return;
}
mChecked = checked;
// Now refresh the drawable state (so the icon changes)
refreshDrawableState();
if (mOnCheckedChangeListener != null) {
mOnCheckedChangeListener.onCheckedChanged(this, checked);
}
}
/**
* Register a callback to be invoked when the checked state of this button
* changes.
*
* @param listener the callback to call on checked state change
*/
public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}
@Override
public boolean isChecked() {
return mChecked;
}
@Override
public void toggle() {
setChecked(!mChecked);
}
/**
* Override performClick() so that we can toggle the checked state when the view is clicked
*/
@Override
public boolean performClick() {
toggle();
return super.performClick();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// As we have changed size, we should invalidate the outline so that is the the
// correct size
invalidateOutline();
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
}
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