Video playback

package dev.cf.recipe;

import dev.cf.Tones;

import dev.crossfly.Capability;
import dev.crossfly.PlatformUtils;
import dev.crossfly.util.Debug;
import dev.crossfly.ui.*;
import dev.crossfly.ui.color.*;
import dev.crossfly.ui.graphics.MaterialIcon;
import dev.crossfly.ui.layout.*;
import dev.crossfly.ui.style.*;

import static dev.crossfly.ui.Widgets.*;

/**
 * Playing video inside the app — and what a native surface costs.
 *
 * <p>{@link VideoPlayer} is the third native surface in the framework, after the map and the web
 * view, and the three share every consequence: the picture is a platform view layered <b>over</b>
 * the GL canvas, so it does not clip to a scrolling parent, it does not take part in a window
 * transition, and it sits on top of anything the app paints in the same place. That is why the
 * player below is on a page of its own rather than inside a list.</p>
 *
 * <p>The capability is asked first, as always. When this recipe was written only the <b>web</b>
 * had it, and this paragraph said so; since 26/09/2026 all five play video in-app ({@code MediaPlayer}
 * on Android, {@code AVPlayer} on iOS and macOS, Media Foundation on
 * Windows, {@code javafx.media} on Linux, a {@code <video>} on the web). The refusal branch below stays: asking is what keeps
 * the screen honest on whatever platform comes next.</p>
 *
 * <p><b>Failure is loud, on purpose.</b> A video that shows black is indistinguishable from a video
 * that is still loading, so {@link VideoPlayer#onError} is wired below and its message is the
 * platform's own words. Two of them are worth recognising: a browser refusing to autoplay (the
 * page had no user gesture, and muting buys the right), and "source not supported", which is nearly
 * always a 404 or a codec rather than a broken player.</p>
 */
public class R32Video extends Recipe
{
   private Label answer;
   private VideoPlayer player;
   private Button playPause, mute, loop;
   private Label time;
   private Slider seek;
   private com.badlogic.gdx.utils.Timer.Task ticker;
   private int duration;
   private boolean muted, looping;

   /** Material Icons: play_arrow, pause, volume_up, volume_off, repeat, repeat_one (loop on). */
   private static final int PLAY = 0xE037, PAUSE = 0xE034, SOUND_ON = 0xE050, SOUND_OFF = 0xE04F,
      REPEAT = 0xE040, REPEAT_ON = 0xE041;

   /**
    * The framework's own test clip, 640x360 [email protected] with sound: a bar sweeps, a counter runs and a
    * beep marks each second, so a frozen picture or a silent track shows at once. Made by
    * tools/MakeVideoTestClip.java and shipped in assets/media (311 KB). Three borrowed files failed
    * first, each with the player in the right (13/10/2026): no audio track, an audio track of zeros,
    * and a 1080p [email protected] picture that JavaFX on Windows froze on. It used to be fetched from the
    * site, until the site's address stopped serving it and the recipe had nothing to play (on the
    * iPhone, 17/10/2026). {@code -Dcrossfly.video.source} points the recipe elsewhere.
    */
   private static final String CLIP = "media/crossfly-video-test.mp4";

   /**
    * Where the clip comes from: {@code -Dcrossfly.video.source} on the desktop, the
    * {@code videosource} launch extra on a phone ({@code adb shell am start ... -e videosource /path}),
    * which has no system properties to set; otherwise the clip in the assets.
    *
    * <p>A native player cannot read inside the jar, the APK or the bundle, so the clip is copied to
    * the app's own folder once and played from there. The web has no folder: its {@code <video>}
    * fetches the asset from the server, where the bundle keeps it out of the start-up download.</p>
    */
   private static String source()
   {
      String s = System.getProperty("crossfly.video.source");
      Object extra = dev.crossfly.Main.cmdline == null ? null : dev.crossfly.Main.cmdline.get("videosource");
      if (s == null && extra != null)
         s = String.valueOf(extra);
      if (s != null)
         return s;
      if (dev.crossfly.device.Device.homeFolder == null)
         return "assets/" + CLIP;
      java.io.File out = new java.io.File(dev.crossfly.device.Device.homeFolder, "crossfly-video-test.mp4");
      byte[] bytes = dev.crossfly.util.Utils.readBytes(CLIP);
      if (bytes == null)
         return CLIP; // the player's error then names it, instead of a black box
      if (out.length() != bytes.length)
         try (java.io.FileOutputStream f = new java.io.FileOutputStream(out))
         {
            f.write(bytes);
         }
         catch (java.io.IOException e)
         {
            return CLIP;
         }
      return out.getAbsolutePath();
   }

   public String title()
   {
      return "Video playback";
   }

   public String note()
   {
      return "A native surface over the canvas, like the map. Ask the capability first: all five"
         + " platforms have it now, and one that does not says so instead of showing black.";
   }

   public void build(Component body) throws Exception
   {
      boolean has = PlatformUtils.isSupported(Capability.VIDEO_PLAYBACK);

      answer = label(has ? "Ready." : "This platform cannot play video in-app yet.", 1f, false,
         has ? Styles.captionColor : Tones.danger(), Position.START);
      answer.testTag("video.answer");
      // Pinned below the scrolling body, so the answer stays in view (see Recipe.pin).
      pin(answer);

      if (!has)
      {
         // The whole point of the screen when the answer is no: say which platform and why, rather
         // than building a player that would refuse in its constructor.
         Card c = new Card();
         c.setLayout(new VerticalLayout(Position.START, Position.START));
         c.add(LAY_AUTO, label("No VIDEO_PLAYBACK on " + dev.crossfly.device.Device.platform, 1.2f,
            true, Styles.textColor, Position.START));
         c.add(LAY_AUTO, label("The engine exists on every platform — ExoPlayer, AVPlayer, the"
            + " system web engine — and nothing is wired to it here yet. An app asks first and"
            + " offers a download instead.", 1f, false, Styles.captionColor, Position.START));
         body.add(LAY_AUTO, c);
         return;
      }

      player = new VideoPlayer();
      player.testTag("video.player");
      player.onError(msg -> said("Could not play: " + msg));
      player.onReady(ms ->
      {
         said("Ready.");
         duration = ms;
         refresh();
      });
      player.onEnded(() ->
      {
         said("Ended.");
         refresh();
      });
      // A FRACTION, never LAY_AUTO. A native surface has no intrinsic height -- it is positioned by
      // the layout and drawn by the platform -- so auto-height resolves to zero and takes the whole
      // body down with it. Measured on Android on 18/09/2026, the first day any platform reaching
      // this branch had video at all: "recipe.body COLLAPSED 0x0, video.answer COLLAPSED 0x0".
      body.add(.5f, player);

      // The control bar of any player: play/pause in one button, the time, a seek bar, sound and
      // repeat. Each toggle shows its STATE in its icon, so the screen answers "is it muted?" without
      // a status line.
      playPause = iconButton(PLAY, "video.play", true, () ->
      {
         if (player.isPlaying())
            player.pause();
         else
         {
            // At the end, Play starts over, as every player does.
            if (duration > 0 && player.position() >= duration - 250)
               player.seekTo(0);
            player.play();
         }
         refresh();
      });
      time = label("0:00 / 0:00", 1f, false, Styles.captionColor, Position.CENTER);
      time.testTag("video.time");
      seek = new Slider(0, 1, 0);
      seek.testTag("video.seek");
      seek.onAction(c ->
      {
         // The timer below moves the bar by writing its value, which fires no action: only a person
         // dragging or tapping it gets here.
         if (duration > 0)
            player.seekTo(Math.round(seek.value * duration));
         refresh();
      });
      mute = iconButton(SOUND_ON, "video.mute", false, () ->
      {
         // Muted is not the same as volume 0 to a browser: only muted earns the right to start
         // without a user gesture. setVolume(0) asks for both.
         muted = !muted;
         player.setVolume(muted ? 0 : 1);
         refresh();
      });
      loop = iconButton(REPEAT, "video.loop", false, () ->
      {
         looping = !looping;
         player.setLooping(looping);
         refresh();
      });
      Component bar = new Component();
      bar.setLayout(new GridLayout(Position.START, Position.CENTER));
      bar.add(0f, 0f, 1f, 0f, 0f, playPause, outgap(time, .5f, 0, .5f, 0), seek, outgap(mute, .5f, 0, 0, 0), outgap(loop, .3f, 0, 0, 0));
      body.add(LAY_AUTO, outgap(bar, 0, .6f, 0, 0));

      // Loaded with the screen: a player shows its first frame and its length before anyone asks.
      // Playing still waits for a tap -- a browser refuses sound without a gesture, and a video
      // that starts talking because a screen opened is a surprise nobody wants.
      player.load(source());
      said("Loading…");
      // About every frame: at four updates a second the bar visibly jumped along (13/10/2026).
      ticker = addTimer(this::refresh, 1 / 30f);
   }

   public void onRemove()
   {
      super.onRemove();
      if (ticker != null)
         ticker.cancel();
   }

   /** Brings the bar in line with the player: the icons, the time and the position. */
   private void refresh()
   {
      if (player == null)
         return;
      boolean playing = player.isPlaying();
      setIcon(playPause, playing ? PAUSE : PLAY);
      setIcon(mute, muted ? SOUND_OFF : SOUND_ON);
      setIcon(loop, looping ? REPEAT_ON : REPEAT);
      int pos = Math.max(0, player.position());
      if (duration <= 0)
         duration = player.duration();
      time.setText(clock(pos) + " / " + clock(duration));
      if (duration > 0)
      {
         seek.value = Math.min(1f, pos / (float) duration);
         seek.setValidLayout(false);
      }
      Screen.repaint();
   }

   private static String clock(int ms)
   {
      int s = Math.max(0, ms) / 1000;
      return s / 60 + ":" + (s % 60 < 10 ? "0" : "") + s % 60;
   }

   /**
    * A round icon button: ComponentStyle.circle sizes it square and rounds it whole, which is the
    * shape every player's controls have. All three the SAME size: the bar's row takes the height of
    * its tallest child and stretches the others, so a larger play button turned the two beside it
    * into tall rounded rectangles (13/10/2026). The main one is filled instead.
    */
   private Button iconButton(int codepoint, String tag, boolean main, Runnable go) throws Exception
   {
      Button b = new Button(MaterialIcon.of(codepoint, 1.4f));
      ButtonStyle st = dev.crossfly.ui.skin.Skin.get()
         .button()
         .pressable()
         .circle(1.3f);
      if (main)
         st.backColor(Styles.primaryColor)
            .iconColor(0xFFFFFFFF)
            .borderColor(0);
      b.style(st);
      b.testTag(tag);
      b.onAction(e -> go.run());
      return b;
   }

   private static void setIcon(Button b, int codepoint)
   {
      b.icon(MaterialIcon.of(codepoint, 1.4f), b.textPos);
      b.setValidLayout(false);
   }

   private void said(String what)
   {
      // To the log as well as to the label, for the same reason R31Files does it: this is a screen
      // people drive by hand to find out whether a native capability actually worked, and a verdict
      // that exists only as pixels is unreadable over ssh or on a device.
      Debug.log("[video] " + what);
      answer.setText(what);
      answer.invalidateMeasure();
      Screen.repaint();
   }
}

package dev.cf.recipe;

import dev.cf.*;
import dev.crossfly.ui.*;
import dev.crossfly.ui.graphics.*;
import dev.crossfly.ui.layout.*;
import dev.crossfly.ui.skin.*;
import dev.crossfly.ui.style.*;

import static dev.crossfly.ui.Widgets.*;

/**
 * Base of a <b>recipe</b>: one screen that shows one thing, and nothing else.
 *
 * <p>A recipe is not a sample. A sample shows a component with all its knobs; a recipe answers a
 * question somebody actually has — "how do I put a filter sheet over a list?", "how do I make this
 * follow the theme?" — in as few lines as it takes, so the answer can be read in one screen and
 * copied without editing.</p>
 *
 * <p>That is the whole design constraint: <b>the boilerplate lives here, the substance lives in the
 * subclass.</b> A recipe that spends twenty lines building a title bar teaches the title bar.</p>
 *
 * <p>Write one as:</p>
 *
 * <pre>
 * public class MyRecipe extends Recipe
 * {
 *    public String title() { return "What this shows"; }
 *    public String note()  { return "The one sentence worth knowing."; }
 *
 *    public void build(Component body) throws Exception
 *    {
 *       body.add(LAY_AUTO, new Button("Tap"));
 *    }
 * }
 * </pre>
 */
public abstract class Recipe extends SampleWindow implements Described
{
   @Override
   public abstract String title();

   /**
    * The one thing a reader should take away — printed above the recipe, in caption tone.
    *
    * @return the note, or null for none
    */
   @Override
   public String note()
   {
      return null;
   }

   /**
    * Builds the recipe.
    *
    * @param body a vertical, scrollable container with sensible padding — add to it and stop
    * @throws Exception when building fails
    */
   public abstract void build(Component body) throws Exception;

   @Override
   public void onAdd(boolean firstTime) throws Exception
   {
      addTopBar(title());

      // The page, not the surface. addTopBar just set fullscreenColor to the surface,
      // and on a white page a white card has no edges — see Tones.page(). Re-derived on restyle so
      // a dark-mode flip does not leave the light page behind.
      fullscreenColor = Tones.page();
      onRestyle(() -> fullscreenColor = Tones.page());

      contents.setLayout(new VerticalLayout(Position.START, Position.START));
      contents.getStyle()
         .ingap(Gap.ofFont(1f, 1f, 1f, 1f));

      String n = note();
      if (n != null)
         contents.add(LAY_AUTO, outgap(nota(n), 0, 0, 0, 1f));

      Component body = new Component();
      body.setLayout(new VerticalLayout(Position.START, Position.START));
      body.setScrollable(ScrollDirection.VERTICAL);
      body.testTag("recipe.body");
      contents.add(LAY_FILL, body);
      build(body);
      if (pinned != null)
      {
         // Measured again once its labels have sizes: the band's AUTO height is taken in the first
         // layout, before them, and on the iPhone it showed only its first line - the odometer's
         // "No text recognizer on this device." was set and never seen (17/10/2026).
         final Component band = pinned;
         onUI(band::invalidateMeasure);
      }
      if (pinned != null)
         body.add(LAY_AUTO, new Component()
         {
            @Override
            public int getAutoHeight()
            {
               // Room for the last row to scroll clear of the floating band.
               return pinned.getAutoHeight();
            }
         });
   }

   /**
    * The note, as a tinted band rather than three lines of grey.
    *
    * <p>It is the one sentence the reader is meant to leave with, and it used to be the least
    * legible thing on the screen: caption-coloured, caption-sized, indistinguishable from the
    * captions further down that are only labels. A tone and a glyph cost nothing here — nobody has
    * to read the band to know what it is.</p>
    *
    * @param n the note text
    * @return the band
    * @throws Exception when building fails
    */
   /**
    * Pins {@code c} to the bottom of the screen, in a band that FLOATS over the scrolling body: it
    * stays on screen however far the body is scrolled, and the body scrolls underneath it. That is the
    * place a recipe says what just happened. An answer at the top of the body went out of view as soon
    * as the person scrolled down to the button that produced it (14/10/2026).
    * <p>
    * The band is 80% OPAQUE (the surface at alpha 0xCC), as the user asked; it floats rather than
    * sitting below the body because a transparency with nothing behind it cannot be seen -- the first
    * version had the band under the body, and the person saw a plain bar. The body gets a spacer as
    * tall as the band at its end, so its last row can still scroll clear of it.
    *
    * @param c the component to pin, usually the answer label
    * @return {@code c}, to chain
    * @throws Exception if the layout refuses
    */
   protected <T extends Component> T pin(T c) throws Exception
   {
      Component band = new Component();
      band.setLayout(new VerticalLayout(Position.START, Position.START));
      band.style(Skin.get()
         .card()
         .backColor(Styles.backColor.withAlpha(0xCC))
         .borderColor(Styles.borderColor.withAlpha(0x33))
         .borderRadius(0)
         .shadow(0, 0, 0, 0)
         .ingap(Gap.ofFont(1f, 1f, 1f, 1.2f))
         .outgap(Gap.ofFont(0)));
      band.add(LAY_AUTO, c);
      // Floated: positioned at the bottom, full width, over whatever the body has there.
      band.setRelativeBounds(Relative.START, Relative.END, Relative.FULL, Relative.AUTO);
      contents.add(LAY_AUTO, band);
      pinned = band;
      return c;
   }

   /** The floating band {@link #pin} made, or null; the body ends in a spacer as tall as it. */
   private Component pinned;

   private Component nota(String n) throws Exception
   {
      Component band = new Component();
      band.setLayout(new GridLayout(Position.START, Position.START));
      band.style(Skin.get()
         .card()
         .backColor(Tones.accent().withAlpha(0x16))
         .borderColor(Tones.accent().withAlpha(0x4A))
         .shadow(0, 0, 0, 0)
         .outgap(Gap.ofFont(0)));
      // 0xE88E is the outlined "info". The glyph column hugs; the text takes the rest and wraps.
      // The weights are GridLayout's own — 0f hugs, 1f takes what is left. LAY_FILL belongs to the
      // vertical and horizontal layouts and means nothing here: it collapsed the text to nothing.
      band.add(LAY_AUTO, 1f, matglyph(0xE88E, Tones.accent(), 1.05f),
         outgap(label(n, 1f, false, secondary(), Position.START), .5f, 0, 0, 0));
      return band;
   }
}

package dev.cf;

import dev.crossfly.ui.*;
import dev.crossfly.ui.graphics.*;
import dev.crossfly.ui.layout.*;
import dev.crossfly.ui.style.*;

import static dev.cf.sample.CrossFlySamplesColors.*;

/**
 * Base class for all CrossFly sample windows.
 * <p>
 * Provides common infrastructure:
 * <ul>
 *   <li>Shared color palette and styles from {@link dev.cf.sample.CrossFlySamplesColors}</li>
 *   <li>{@link #addTopBar(String, Button...)} — standard deep-indigo top bar with back button</li>
 *   <li>{@link #barButton(String, Runnable)} — helper to create icon buttons for the bar</li>
 * </ul>
 *
 * <h3>Usage</h3>
 * <pre>
 * public class MySample extends SampleWindow {
 *     public void onAdd(boolean firstTime) throws Exception {
 *         if (!firstTime) return;
 *         initWindow();
 *         addTopBar("My Sample");
 *         // ... add content
 *     }
 * }
 * </pre>
 */
public abstract class SampleWindow extends Window
{
   /** The main content area of the window, added by {@link #addTopBar(String, Button...)}, for subclasses to add their content into. */
   protected Component contents;

   // ─── Top bar ─────────────────────────────────────────────────────────────

   /**
    * Builds and adds a standard top bar with a back (←) button on the left,
    * a centered title, and any optional extra buttons on the right.
    *
    * @param title        the text shown in the bar
    * @param rightButtons zero or more icon buttons placed aligned to the right
    * @throws Exception if component construction fails
    */
   protected void addTopBar(String title, Button... rightButtons) throws Exception
   {
      fullscreenColor = Styles.backColor.color();
      setLayout(new VerticalLayout());
      add(0f, buildTopBar(title, rightButtons));
      add(LAY_FILL, contents = new Component());
      contents.getStyle()
         .ingap(Gap.ofFont(0, .5f, 0, .5f));
   }

   /**
    * Same as {@link #addTopBar(String, Button...)}, but returns the bar component
    * instead of adding it, for callers that need to position it manually.
    *
    * @param title        the bar title
    * @param rightButtons optional right-side icon buttons
    * @return the assembled top-bar {@link Component}
    * @throws Exception if component construction fails
    */
   protected Component buildTopBar(String title, Button... rightButtons) throws Exception
   {
      Button btBack = barButton("\ue5c4", this::hide);   // arrow_back
      btBack.testTag("sample.back");
      // Padded on every side, like the bar's right buttons: with none above and below, the target
      // was the arrow itself, too small to hit on a small phone (iPhone 5s, 17/10/2026).
      btBack.getStyle()
         .ingap(Gap.ofFont(.75f))
         .outgap(Gap.ofFont(0, 0, .25f, 0));

      Component bar = new Component().style(barStyle);
      bar.setLayout(new GridLayout(Position.START, Position.CENTER));

      int n = 2 + rightButtons.length;
      Object[] params = new Object[n * 2];
      params[0] = 0f;
      params[1] = 1f;
      for (int i = 0; i < rightButtons.length; i++)
         params[2 + i] = 0f;
      params[n] = btBack;
      params[n + 1] = new Label(title).style(barTitleStyle);
      for (int i = 0; i < rightButtons.length; i++)
      {
         params[n + 2 + i] = rightButtons[i];
         rightButtons[i].getStyle()
            .ingap(Gap.ofFont(.75f));
      }

      bar.add(params);
      return bar;
   }

   /**
    * Creates a standard bar icon button (transparent, white icon, pressed feedback).
    *
    * @param materialIcon the Material Icon unicode codepoint string
    * @param action       the action to run when the button is tapped
    * @return the configured {@link Button}
    */
   protected Button barButton(String materialIcon, Runnable action)
   {
      return new Button(new MaterialIcon(materialIcon)).style(barButtonNormal)
         .pressedStyle(barButtonPressed)
         .onAction(e -> action.run());
   }
}