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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.settings.accessibility;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import com.android.settings.R;
/**
* Grid preference that allows the user to pick a color from a predefined set of
* colors. Optionally shows a preview in the preference item.
*/
public class ColorPreference extends ListDialogPreference {
private ColorDrawable mPreviewColor;
private boolean mPreviewEnabled;
public ColorPreference(Context context, AttributeSet attrs) {
super(context, attrs);
setDialogLayoutResource(R.layout.grid_picker_dialog);
setListItemLayoutResource(R.layout.color_picker_item);
}
/**
* @param enabled whether to show a preview in the preference item
*/
public void setPreviewEnabled(boolean enabled) {
if (mPreviewEnabled != enabled) {
mPreviewEnabled = enabled;
if (enabled) {
setWidgetLayoutResource(R.layout.preference_color);
} else {
setWidgetLayoutResource(0);
}
}
}
@Override
public boolean shouldDisableDependents() {
return Color.alpha(getValue()) == 0 || super.shouldDisableDependents();
}
@Override
protected CharSequence getTitleAt(int index) {
final CharSequence title = super.getTitleAt(index);
if (title != null) {
return title;
}
// If no title was supplied, format title using RGB values.
final int value = getValueAt(index);
final int r = Color.red(value);
final int g = Color.green(value);
final int b = Color.blue(value);
return getContext().getString(R.string.color_custom, r, g, b);
}
@Override
protected void onBindView(View view) {
super.onBindView(view);
if (mPreviewEnabled) {
final ImageView previewImage = (ImageView) view.findViewById(R.id.color_preview);
final int argb = getValue();
if (Color.alpha(argb) < 255) {
previewImage.setBackgroundResource(R.drawable.transparency_tileable);
} else {
previewImage.setBackground(null);
}
if (mPreviewColor == null) {
mPreviewColor = new ColorDrawable(argb);
previewImage.setImageDrawable(mPreviewColor);
} else {
mPreviewColor.setColor(argb);
}
final CharSequence summary = getSummary();
if (!TextUtils.isEmpty(summary)) {
previewImage.setContentDescription(summary);
} else {
previewImage.setContentDescription(null);
}
previewImage.setAlpha(isEnabled() ? 1f : 0.2f);
}
}
@Override
protected void onBindListItem(View view, int index) {
final int argb = getValueAt(index);
final int alpha = Color.alpha(argb);
final ImageView swatch = (ImageView) view.findViewById(R.id.color_swatch);
if (alpha < 255) {
swatch.setBackgroundResource(R.drawable.transparency_tileable);
} else {
swatch.setBackground(null);
}
final Drawable foreground = swatch.getDrawable();
if (foreground instanceof ColorDrawable) {
((ColorDrawable) foreground).setColor(argb);
} else {
swatch.setImageDrawable(new ColorDrawable(argb));
}
final CharSequence title = getTitleAt(index);
if (title != null) {
final TextView summary = (TextView) view.findViewById(R.id.summary);
summary.setText(title);
}
}
}
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