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/*
* Copyright (C) 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 android.support.v17.leanback.app;
import android.graphics.Paint;
import android.graphics.Paint.FontMetricsInt;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v17.leanback.R;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
/**
* A fragment for displaying an error indication.
*/
public class ErrorFragment extends BrandedFragment {
private ViewGroup mErrorFrame;
private ImageView mImageView;
private TextView mTextView;
private Button mButton;
private Drawable mDrawable;
private CharSequence mMessage;
private String mButtonText;
private View.OnClickListener mButtonClickListener;
private Drawable mBackgroundDrawable;
private boolean mIsBackgroundTranslucent = true;
/**
* Sets the default background.
*
* @param translucent True to set a translucent background.
*/
public void setDefaultBackground(boolean translucent) {
mBackgroundDrawable = null;
mIsBackgroundTranslucent = translucent;
updateBackground();
updateMessage();
}
/**
* Returns true if the background is translucent.
*/
public boolean isBackgroundTranslucent() {
return mIsBackgroundTranslucent;
}
/**
* Sets a drawable for the fragment background.
*
* @param drawable The drawable used for the background.
*/
public void setBackgroundDrawable(Drawable drawable) {
mBackgroundDrawable = drawable;
if (drawable != null) {
final int opacity = drawable.getOpacity();
mIsBackgroundTranslucent = (opacity == PixelFormat.TRANSLUCENT
|| opacity == PixelFormat.TRANSPARENT);
}
updateBackground();
updateMessage();
}
/**
* Returns the background drawable. May be null if a default is used.
*/
public Drawable getBackgroundDrawable() {
return mBackgroundDrawable;
}
/**
* Sets the drawable to be used for the error image.
*
* @param drawable The drawable used for the error image.
*/
public void setImageDrawable(Drawable drawable) {
mDrawable = drawable;
updateImageDrawable();
}
/**
* Returns the drawable used for the error image.
*/
public Drawable getImageDrawable() {
return mDrawable;
}
/**
* Sets the error message.
*
* @param message The error message.
*/
public void setMessage(CharSequence message) {
mMessage = message;
updateMessage();
}
/**
* Returns the error message.
*/
public CharSequence getMessage() {
return mMessage;
}
/**
* Sets the button text.
*
* @param text The button text.
*/
public void setButtonText(String text) {
mButtonText = text;
updateButton();
}
/**
* Returns the button text.
*/
public String getButtonText() {
return mButtonText;
}
/**
* Set the button click listener.
*
* @param clickListener The click listener for the button.
*/
public void setButtonClickListener(View.OnClickListener clickListener) {
mButtonClickListener = clickListener;
updateButton();
}
/**
* Returns the button click listener.
*/
public View.OnClickListener getButtonClickListener() {
return mButtonClickListener;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.lb_error_fragment, container, false);
mErrorFrame = (ViewGroup) root.findViewById(R.id.error_frame);
updateBackground();
installTitleView(inflater, mErrorFrame, savedInstanceState);
mImageView = (ImageView) root.findViewById(R.id.image);
updateImageDrawable();
mTextView = (TextView) root.findViewById(R.id.message);
updateMessage();
mButton = (Button) root.findViewById(R.id.button);
updateButton();
FontMetricsInt metrics = getFontMetricsInt(mTextView);
int underImageBaselineMargin = container.getResources().getDimensionPixelSize(
R.dimen.lb_error_under_image_baseline_margin);
setTopMargin(mTextView, underImageBaselineMargin + metrics.ascent);
int underMessageBaselineMargin = container.getResources().getDimensionPixelSize(
R.dimen.lb_error_under_message_baseline_margin);
setTopMargin(mButton, underMessageBaselineMargin - metrics.descent);
return root;
}
private void updateBackground() {
if (mErrorFrame != null) {
if (mBackgroundDrawable != null) {
mErrorFrame.setBackground(mBackgroundDrawable);
} else {
mErrorFrame.setBackgroundColor(mErrorFrame.getResources().getColor(
mIsBackgroundTranslucent
? R.color.lb_error_background_color_translucent
: R.color.lb_error_background_color_opaque));
}
}
}
private void updateMessage() {
if (mTextView != null) {
mTextView.setText(mMessage);
mTextView.setVisibility(TextUtils.isEmpty(mMessage) ? View.GONE : View.VISIBLE);
}
}
private void updateImageDrawable() {
if (mImageView != null) {
mImageView.setImageDrawable(mDrawable);
mImageView.setVisibility(mDrawable == null ? View.GONE : View.VISIBLE);
}
}
private void updateButton() {
if (mButton != null) {
mButton.setText(mButtonText);
mButton.setOnClickListener(mButtonClickListener);
mButton.setVisibility(TextUtils.isEmpty(mButtonText) ? View.GONE : View.VISIBLE);
mButton.requestFocus();
}
}
@Override
public void onStart() {
super.onStart();
mErrorFrame.requestFocus();
}
private static FontMetricsInt getFontMetricsInt(TextView textView) {
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setTextSize(textView.getTextSize());
paint.setTypeface(textView.getTypeface());
return paint.getFontMetricsInt();
}
private static void setTopMargin(TextView textView, int topMargin) {
ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) textView.getLayoutParams();
lp.topMargin = topMargin;
textView.setLayoutParams(lp);
}
}
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