SMSListWidget.java

package me.desht.scrollingmenusign.spout;

import com.google.common.base.Joiner;
import me.desht.dhutils.Debugger;
import me.desht.dhutils.MiscUtil;
import me.desht.scrollingmenusign.SMSException;
import me.desht.scrollingmenusign.SMSMenu;
import me.desht.scrollingmenusign.SMSMenuItem;
import me.desht.scrollingmenusign.ScrollingMenuSign;
import me.desht.scrollingmenusign.views.SMSScrollableView;
import me.desht.scrollingmenusign.views.SMSSpoutView;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.getspout.spoutapi.gui.Color;
import org.getspout.spoutapi.gui.GenericListWidget;
import org.getspout.spoutapi.gui.ListWidgetItem;
import org.getspout.spoutapi.gui.Scrollable;
import org.getspout.spoutapi.player.SpoutPlayer;

public class SMSListWidget extends GenericListWidget {
    private static final float THRESHOLD = 129;

    private final SMSSpoutView view;
    private final SpoutPlayer sp;

    private String defaultTextColor = ChatColor.BLACK.toString();
    private boolean ignoreNextSelection;

    public SMSListWidget(SpoutPlayer sp, SMSSpoutView view) {
        this.view = view;
        this.sp = sp;

        repaint();
    }

    public SMSSpoutView getView() {
        return view;
    }

    public void ignoreNextSelection(boolean ignore) {
        this.ignoreNextSelection = ignore;
    }

    public Scrollable updateBackground() {
        HexColor cw = (HexColor) view.getAttribute(SMSSpoutView.BACKGROUND);
        double alpha = (Double) view.getAttribute(SMSSpoutView.ALPHA);
        Color c = cw.getColor();
        c.setAlpha((float) alpha);
        Debugger.getInstance().debug(2, "updateBackground: view = " + view.getName() + " background = " + c.toString());

        // choose a contrasting text colour - black for a pale background, white for a dark background
        int luminance = (int) Math.sqrt(c.getRedI() * c.getRedI() * 0.241 + c.getGreenI() * c.getGreenI() * 0.691 + c.getBlueI() * c.getBlueI() * 0.068);
        if (luminance > THRESHOLD) {
            defaultTextColor = ChatColor.BLACK.toString();
        } else {
            defaultTextColor = ChatColor.WHITE.toString();
        }
        return setBackgroundColor(c);
    }

    @Override
    public void onSelected(int idx, boolean doubleClicked) {
        if (idx < 0) {
            return;
        }
        if (ignoreNextSelection) {
            // this allows us to scroll with the keyboard - we can stop here if this selection was due to
            // the player scrolling up or down with the cursor keys
            ignoreNextSelection = false;
            return;
        }

        // bit of a hack - cast to SMSScrollableView to avoid an unnecessary call to SpoutViewPopup.scrollTo()
        //noinspection RedundantCast
        ((SMSScrollableView) view).setScrollPos(getScreen().getPlayer(), idx + 1);

        if (!doubleClicked && ScrollingMenuSign.getInstance().getConfig().getBoolean("sms.spout.double_click")) {
            return;
        }

        final SpoutPlayer player = getScreen().getPlayer();
        SMSMenu menu = view.getActiveMenu(player);
        SMSMenuItem item = view.getActiveMenuItemAt(sp, idx + 1);
        try {
            if (item == null) {
                throw new SMSException("spout list widget onSelected: index " + idx + " out of range for " + menu.getName() + " ?");
            }
            item.executeCommand(player, view);
            item.feedbackMessage(player);
            view.onExecuted(player);
            if (menu != view.getActiveMenu(player)) {
                Bukkit.getScheduler().runTaskLater(ScrollingMenuSign.getInstance(), new Runnable() {
                    @Override
                    public void run() {
                        view.showGUI(player);
                    }
                }, 2L);
            }
        } catch (SMSException e) {
            MiscUtil.errorMessage(player, e.getMessage());
        }
    }

    public void repaint() {
        updateBackground();
        populateMenu();
    }

    private void populateMenu() {
        clear();

        boolean showTooltips = ScrollingMenuSign.getInstance().getConfig().getBoolean("sms.spout.show_tooltips");

        int nItems = view.getActiveMenuItemCount(sp);
        for (int i = 1; i <= nItems; i++) {
            SMSMenuItem item = view.getActiveMenuItemAt(sp, i);
            String text = view.getActiveItemLabel(sp, i);
            String lore = showTooltips && item.hasPermission(sp) ? Joiner.on(" ").join(item.getLore()) : "";
            addItem(new ListWidgetItem(defaultTextColor + view.doVariableSubstitutions(sp, text), lore));
        }
    }

}