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/**
* Copyright (C) 2013 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.android.inputmethod.dictionarypack;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewPropertyAnimator;
import android.widget.Button;
import android.widget.FrameLayout;
import com.android.inputmethod.latin.R;
/**
* A view that handles buttons inside it according to a status.
*/
public class ButtonSwitcher extends FrameLayout {
public static final int NOT_INITIALIZED = -1;
public static final int STATUS_NO_BUTTON = 0;
public static final int STATUS_INSTALL = 1;
public static final int STATUS_CANCEL = 2;
public static final int STATUS_DELETE = 3;
// One of the above
private int mStatus = NOT_INITIALIZED;
private int mAnimateToStatus = NOT_INITIALIZED;
// Animation directions
public static final int ANIMATION_IN = 1;
public static final int ANIMATION_OUT = 2;
private Button mInstallButton;
private Button mCancelButton;
private Button mDeleteButton;
private DictionaryListInterfaceState mInterfaceState;
private OnClickListener mOnClickListener;
public ButtonSwitcher(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ButtonSwitcher(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void reset(final DictionaryListInterfaceState interfaceState) {
mStatus = NOT_INITIALIZED;
mAnimateToStatus = NOT_INITIALIZED;
mInterfaceState = interfaceState;
}
@Override
protected void onLayout(final boolean changed, final int left, final int top, final int right,
final int bottom) {
super.onLayout(changed, left, top, right, bottom);
mInstallButton = (Button)findViewById(R.id.dict_install_button);
mCancelButton = (Button)findViewById(R.id.dict_cancel_button);
mDeleteButton = (Button)findViewById(R.id.dict_delete_button);
setInternalOnClickListener(mOnClickListener);
setButtonPositionWithoutAnimation(mStatus);
if (mAnimateToStatus != NOT_INITIALIZED) {
// We have been asked to animate before we were ready, so we took a note of it.
// We are now ready: launch the animation.
animateButtonPosition(mStatus, mAnimateToStatus);
mStatus = mAnimateToStatus;
mAnimateToStatus = NOT_INITIALIZED;
}
}
private Button getButton(final int status) {
switch(status) {
case STATUS_INSTALL:
return mInstallButton;
case STATUS_CANCEL:
return mCancelButton;
case STATUS_DELETE:
return mDeleteButton;
default:
return null;
}
}
public void setStatusAndUpdateVisuals(final int status) {
if (mStatus == NOT_INITIALIZED) {
setButtonPositionWithoutAnimation(status);
mStatus = status;
} else {
if (null == mInstallButton) {
// We may come here before we have been layout. In this case we don't know our
// size yet so we can't start animations so we need to remember what animation to
// start once layout has gone through.
mAnimateToStatus = status;
} else {
animateButtonPosition(mStatus, status);
mStatus = status;
}
}
}
private void setButtonPositionWithoutAnimation(final int status) {
// This may be called by setStatus() before the layout has come yet.
if (null == mInstallButton) return;
final int width = getWidth();
// Set to out of the screen if that's not the currently displayed status
mInstallButton.setTranslationX(STATUS_INSTALL == status ? 0 : width);
mCancelButton.setTranslationX(STATUS_CANCEL == status ? 0 : width);
mDeleteButton.setTranslationX(STATUS_DELETE == status ? 0 : width);
}
// The helper method for {@link AnimatorListenerAdapter}.
void animateButtonIfStatusIsEqual(final View newButton, final int newStatus) {
if (newStatus != mStatus) return;
animateButton(newButton, ANIMATION_IN);
}
private void animateButtonPosition(final int oldStatus, final int newStatus) {
final View oldButton = getButton(oldStatus);
final View newButton = getButton(newStatus);
if (null != oldButton && null != newButton) {
// Transition between two buttons : animate out, then in
animateButton(oldButton, ANIMATION_OUT).setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(final Animator animation) {
animateButtonIfStatusIsEqual(newButton, newStatus);
}
});
} else if (null != oldButton) {
animateButton(oldButton, ANIMATION_OUT);
} else if (null != newButton) {
animateButton(newButton, ANIMATION_IN);
}
}
public void setInternalOnClickListener(final OnClickListener listener) {
mOnClickListener = listener;
if (null != mInstallButton) {
// Already laid out : do it now
mInstallButton.setOnClickListener(mOnClickListener);
mCancelButton.setOnClickListener(mOnClickListener);
mDeleteButton.setOnClickListener(mOnClickListener);
}
}
private ViewPropertyAnimator animateButton(final View button, final int direction) {
final float outerX = getWidth();
final float innerX = button.getX() - button.getTranslationX();
mInterfaceState.removeFromCache((View)getParent());
if (ANIMATION_IN == direction) {
button.setClickable(true);
return button.animate().translationX(0);
}
button.setClickable(false);
return button.animate().translationX(outerX - innerX);
}
}
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