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/*
* Copyright (C) 2010 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.gallery3d.photoeditor;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.ViewSwitcher;
import com.android.gallery3d.R;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map.Entry;
/**
* Action bar that contains buttons such as undo, redo, save, etc.
*/
public class ActionBar extends RelativeLayout {
private static final float ENABLED_ALPHA = 1;
private static final float DISABLED_ALPHA = 0.47f;
private final HashMap<Integer, Runnable> buttonRunnables = new HashMap<Integer, Runnable>();
private final HashSet<Integer> changedButtons = new HashSet<Integer>();
public ActionBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
// Show the action-bar title only when there's still room for it; otherwise, hide it.
int width = 0;
for (int i = 0; i < getChildCount(); i++) {
width += getChildAt(i).getWidth();
}
findViewById(R.id.action_bar_title).setVisibility(((width > r - l)) ? INVISIBLE: VISIBLE);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
enableButton(R.id.undo_button, false);
enableButton(R.id.redo_button, false);
enableButton(R.id.save_button, false);
}
/**
* Restores the passed action-bar.
*
* @return the passed parameter.
*/
public ActionBar restore(ActionBar actionBar) {
// Restores by runnables and enabled status of buttons that have been changed.
for (Entry<Integer, Runnable> entry : buttonRunnables.entrySet()) {
actionBar.setRunnable(entry.getKey(), entry.getValue());
}
for (int buttonId : changedButtons) {
actionBar.enableButton(buttonId, isButtonEnabled(buttonId));
}
return actionBar;
}
public void setRunnable(int buttonId, final Runnable r) {
findViewById(buttonId).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (isEnabled()) {
r.run();
}
}
});
buttonRunnables.put(buttonId, r);
}
public void clickButton(int buttonId) {
findViewById(buttonId).performClick();
}
public boolean isButtonEnabled(int buttonId) {
return findViewById(buttonId).isEnabled();
}
public void enableButton(int buttonId, boolean enabled) {
View button = findViewById(buttonId);
button.setEnabled(enabled);
button.setAlpha(enabled ? ENABLED_ALPHA : DISABLED_ALPHA);
// Track buttons whose enabled status has been updated.
changedButtons.add(buttonId);
if (buttonId == R.id.save_button) {
// Show share-button only after photo is edited and saved; otherwise, show save-button.
// TODO: Fix the assumption of undo enabled status must be updated before reaching here.
boolean showShare = findViewById(R.id.undo_button).isEnabled() && !enabled;
ViewSwitcher switcher = (ViewSwitcher) findViewById(R.id.save_share_buttons);
int next = switcher.getNextView().getId();
if ((showShare && (next == R.id.share_button))
|| (!showShare && (next == R.id.save_button))) {
switcher.showNext();
}
}
}
}
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