package trikita.slide;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.text.Layout;
import android.text.SpannableStringBuilder;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.text.style.RelativeSizeSpan;
import android.text.style.StyleSpan;
import android.text.style.TypefaceSpan;
import android.view.Gravity;
import com.squareup.picasso.RequestCreator;
import com.squareup.picasso.Target;
import com.squareup.picasso.Picasso;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import trikita.anvil.Anvil;
public class Slide {
private static class Background {
private static final Map<String, Integer> GRAVITY = new HashMap<>();
static {
GRAVITY.put("left", Gravity.LEFT);
GRAVITY.put("top", Gravity.TOP);
GRAVITY.put("right", Gravity.RIGHT);
GRAVITY.put("bottom", Gravity.BOTTOM);
GRAVITY.put("center", Gravity.CENTER);
GRAVITY.put("w", Gravity.LEFT);
GRAVITY.put("n", Gravity.TOP);
GRAVITY.put("e", Gravity.RIGHT);
GRAVITY.put("s", Gravity.BOTTOM);
GRAVITY.put("nw", Gravity.LEFT | Gravity.TOP);
GRAVITY.put("sw", Gravity.LEFT | Gravity.BOTTOM);
GRAVITY.put("ne", Gravity.RIGHT | Gravity.TOP);
GRAVITY.put("se", Gravity.RIGHT | Gravity.BOTTOM);
}
private final String url;
private final float scale;
private final int gravity;
public Background(String bg) {
int g = Gravity.CENTER;
float scale = 1f;
String url = null;
for (String part : bg.split("\\s+")) {
if (part.endsWith("%")) {
try {
scale = Float.parseFloat(part.substring(0, part.length() - 1)) / 100;
} catch (NumberFormatException ignored) {}
} else if (GRAVITY.containsKey(part)) {
g = GRAVITY.get(part);
} else if (part.contains("://")){
url = part;
}
}
this.url = url;
this.scale = scale;
this.gravity = g;
}
}
private final List<Background> backgrounds = new ArrayList<>();
private final Map<String, CacheTarget> bitmaps = new HashMap<>();
private final SpannableStringBuilder text = new SpannableStringBuilder();
private Slide(String s) {
int emSpanStart = -1;
for (String line : s.split("\n")) {
if (line.startsWith("@")) {
backgrounds.add(new Background(line.substring(1)));
} else if (line.startsWith("#")) {
int start = text.length();
text.append(line.substring(1)).append('\n');
text.setSpan(new RelativeSizeSpan(1.6f), start, text.length(), 0);
text.setSpan(new StyleSpan(Typeface.BOLD), start, text.length(), 0);
} else if (line.startsWith(" ")) {
int start = text.length();
text.append(line.substring(2)).append('\n');
text.setSpan(new TypefaceSpan("monospace"), start, text.length(), 0);
} else {
if (line.startsWith(".")) {
line = line.substring(1);
}
// Handle emphasis
for (int i = 0; i < line.length(); i++) {
char c = line.charAt(i);
if (c == '*') {
if (emSpanStart == -1) {
emSpanStart = text.length();
} else {
if (emSpanStart != text.length()) {
text.setSpan(new StyleSpan(Typeface.BOLD), emSpanStart, text.length(), 0);
} else {
text.append('*');
}
emSpanStart = -1;
}
} else {
text.append(c);
}
}
text.append('\n');
}
}
if (text.length() > 0 && text.charAt(text.length() - 1) == '\n') {
text.delete(text.length() - 1, text.length());
}
}
private static class CacheTarget implements Target {
private Bitmap cacheBitmap;
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
cacheBitmap = bitmap;
if (from != Picasso.LoadedFrom.MEMORY) {
Anvil.render();
}
}
@Override public void onBitmapFailed(Drawable errorDrawable) {}
@Override public void onPrepareLoad(Drawable placeHolderDrawable) {}
public Bitmap getCacheBitmap() {
return cacheBitmap;
}
}
public void render(Context c, Canvas canvas, int width, int height, String typeface, int fg, int bg, boolean blocking) {
TextPaint textPaint = new TextPaint();
canvas.drawColor(bg);
textPaint.setColor(fg);
textPaint.setAntiAlias(true);
textPaint.setTypeface(Typeface.create(typeface, 0));
for (Background img: backgrounds) {
if (img.url != null) {
Bitmap b = null;
CacheTarget cacheTarget = new CacheTarget();
bitmaps.put(img.url, cacheTarget);
RequestCreator request = Picasso.with(c)
.load(img.url);
if (img.scale > 0) {
request = request.resize((int) (width * img.scale), (int) (height * img.scale));
} else {
request = request.resize(width, height);
}
request = request.centerInside();
if (blocking) {
try {
b = request.get();
} catch (IOException e) {
e.printStackTrace();
}
} else {
request.into(cacheTarget);
b = cacheTarget.getCacheBitmap();
}
if (b != null) {
Rect r = new Rect();
Gravity.apply(img.gravity, b.getWidth(), b.getHeight(),
new Rect(0, 0, width, height), r);
canvas.drawBitmap(b, r.left, r.top, textPaint);
}
}
}
float margin = 0.1f;
int w = (int) (width * (1 - margin * 2));
int h = (int) (height * (1 - margin * 2));
for (int textSize = height; textSize > 1 ; textSize--) {
textPaint.setTextSize(textSize);
if (StaticLayout.getDesiredWidth(text, textPaint) <= w) {
StaticLayout layout = new StaticLayout(text, textPaint, w, Layout.Alignment.ALIGN_NORMAL, 1, 0, false);
if (layout.getHeight() >= h) {
continue;
}
int l = 0;
for (int i = 0; i < layout.getLineCount(); i++) {
int m = (int) (width - layout.getLineWidth(i))/2;
if (i == 0 || m < l) {
l = m;
}
}
canvas.translate(l, (height - layout.getHeight())/2);
textPaint.setColor(bg);
textPaint.setStyle(Paint.Style.STROKE);
textPaint.setStrokeWidth(8);
layout = new StaticLayout(text, textPaint, w, Layout.Alignment.ALIGN_NORMAL, 1, 0, false);
layout.draw(canvas);
textPaint.setColor(fg);
textPaint.setStyle(Paint.Style.FILL);
textPaint.setStrokeWidth(0);
layout = new StaticLayout(text, textPaint, w, Layout.Alignment.ALIGN_NORMAL, 1, 0, false);
layout.draw(canvas);
return;
}
}
}
public static List<Slide> parse(String s) {
List<Slide> slides = new ArrayList<>();
String[] paragraphs = s.split("(\n\\s*){2,}");
for (String par : paragraphs) {
slides.add(new Slide(par));
}
return slides;
}
}
