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package se.leap.bitmaskclient.views;
import android.content.Context;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import androidx.appcompat.widget.AppCompatTextView;
import android.text.Spannable;
import android.text.style.ImageSpan;
import android.util.AttributeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class IconTextView extends AppCompatTextView {
private int imageResource = 0;
/**
* Regex pattern that looks for embedded images of the format: [img src=imageName/]
*/
public static final String PATTERN = "\\Q[img src]\\E";
public IconTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public IconTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public IconTextView(Context context) {
super(context);
}
@Override
public void setText(CharSequence text, BufferType type) {
final Spannable spannable = getTextWithImages(getContext(), text, getLineHeight(), getCurrentTextColor());
super.setText(spannable, BufferType.SPANNABLE);
}
public void setIcon(int imageResource) {
this.imageResource = imageResource;
}
private Spannable getTextWithImages(Context context, CharSequence text, int lineHeight, int colour) {
final Spannable spannable = Spannable.Factory.getInstance().newSpannable(text);
addImages(context, spannable, lineHeight, colour);
return spannable;
}
private void addImages(Context context, Spannable spannable, int lineHeight, int colour) {
final Pattern refImg = Pattern.compile(PATTERN);
final Matcher matcher = refImg.matcher(spannable);
while (matcher.find()) {
boolean set = true;
for (ImageSpan span : spannable.getSpans(matcher.start(), matcher.end(), ImageSpan.class)) {
if (spannable.getSpanStart(span) >= matcher.start()
&& spannable.getSpanEnd(span) <= matcher.end()) {
spannable.removeSpan(span);
} else {
set = false;
break;
}
}
if (set && imageResource != 0) {
spannable.setSpan(makeImageSpan(context, imageResource, lineHeight, colour),
matcher.start(),
matcher.end(),
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
}
}
/**
* Create an ImageSpan for the given icon drawable. This also sets the image size and colour.
* Works best with a white, square icon because of the colouring and resizing.
*
* @param context The Android Context.
* @param drawableResId A drawable resource Id.
* @param size The desired size (i.e. width and height) of the image icon in pixels.
* Use the lineHeight of the TextView to make the image inline with the
* surrounding text.
* @param colour The colour (careful: NOT a resource Id) to apply to the image.
* @return An ImageSpan, aligned with the bottom of the text.
*/
private ImageSpan makeImageSpan(Context context, int drawableResId, int size, int colour) {
final Drawable drawable = context.getResources().getDrawable(drawableResId);
drawable.mutate();
drawable.setColorFilter(colour, PorterDuff.Mode.MULTIPLY);
drawable.setBounds(0, 0, size, size);
return new ImageSpan(drawable, ImageSpan.ALIGN_BOTTOM);
}
}
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