Add a multiline text widget

Closes #36.

src/main/java/io/github/cottonmc/cotton/gui/widget/WLabel.java

@@ -14,6 +14,9 @@
 
 import javax.annotation.Nullable;
 
+/**
+ * A single-line label widget.
+ */
 public class WLabel extends WWidget {
 	protected Text text;
 	protected Alignment alignment = Alignment.LEFT;
@@ -37,6 +40,10 @@ public WLabel(String text) {
 		this(text, DEFAULT_TEXT_COLOR);
 	}
 
+	public WLabel(Text text) {
+		this(text, DEFAULT_TEXT_COLOR);
+	}
+
 	@Override
 	public void paintBackground(int x, int y, int mouseX, int mouseY) {
 		String translated = text.asFormattedString();

src/main/java/io/github/cottonmc/cotton/gui/widget/WText.java

@@ -0,0 +1,133 @@
+package io.github.cottonmc.cotton.gui.widget;
+
+import io.github.cottonmc.cotton.gui.client.LibGuiClient;
+import io.github.cottonmc.cotton.gui.client.ScreenDrawing;
+import io.github.cottonmc.cotton.gui.widget.data.Alignment;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.api.Environment;
+import net.fabricmc.loader.api.FabricLoader;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.font.TextRenderer;
+import net.minecraft.client.util.Texts;
+import net.minecraft.text.Text;
+
+import javax.annotation.Nullable;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * A multiline label widget.
+ *
+ * @since 1.8.0
+ */
+public class WText extends WWidget {
+	protected Text text;
+	protected int color;
+	protected int darkmodeColor;
+	protected Alignment alignment = Alignment.LEFT;
+	private List<Text> wrappedLines;
+
+	public WText(Text text) {
+		this(text, WLabel.DEFAULT_TEXT_COLOR);
+	}
+
+	public WText(Text text, int color) {
+		this.text = Objects.requireNonNull(text, "text must not be null");
+		this.color = color;
+		this.darkmodeColor = (color == WLabel.DEFAULT_TEXT_COLOR) ? WLabel.DEFAULT_DARKMODE_TEXT_COLOR : color;
+	}
+
+	@Override
+	public void setSize(int x, int y) {
+		super.setSize(x, y);
+		if (FabricLoader.getInstance().getEnvironmentType() == EnvType.CLIENT) {
+			wrapLines();
+		}
+	}
+
+	@Environment(EnvType.CLIENT)
+	private void wrapLines() {
+		TextRenderer font = MinecraftClient.getInstance().textRenderer;
+		wrappedLines = Texts.wrapLines(text, width, font, true, true);
+	}
+
+	@Environment(EnvType.CLIENT)
+	@Nullable
+	protected Text getTextAt(int x, int y) {
+		TextRenderer font = MinecraftClient.getInstance().textRenderer;
+		int lineIndex = y / font.fontHeight;
+
+		if (lineIndex >= 0 && lineIndex < wrappedLines.size()) {
+			Text line = wrappedLines.get(lineIndex);
+			int xi = 0;
+			for (Text part : line) {
+				xi += font.getStringWidth(part.asFormattedString());
+				if (xi > x) return part;
+			}
+		}
+
+		return null;
+	}
+
+	@Environment(EnvType.CLIENT)
+	@Override
+	public void paintBackground(int x, int y, int mouseX, int mouseY) {
+		TextRenderer font = MinecraftClient.getInstance().textRenderer;
+		for (int i = 0; i < wrappedLines.size(); i++) {
+			Text line = wrappedLines.get(i);
+			int c = LibGuiClient.config.darkMode ? darkmodeColor : color;
+			String str = line.asFormattedString();
+
+			ScreenDrawing.drawString(str, alignment, x, y + i * font.fontHeight, width, c);
+		}
+	}
+
+	@Override
+	public void onClick(int x, int y, int button) {
+		if (button != 0) return; // only left clicks
+
+		Text hoveredText = getTextAt(x, y);
+		if (hoveredText != null) {
+			MinecraftClient.getInstance().currentScreen.handleTextClick(hoveredText);
+		}
+	}
+
+	public Text getText() {
+		return text;
+	}
+
+	public WText setText(Text text) {
+		this.text = text;
+
+		if (FabricLoader.getInstance().getEnvironmentType() == EnvType.CLIENT) {
+			wrapLines();
+		}
+
+		return this;
+	}
+
+	public int getColor() {
+		return color;
+	}
+
+	public WText setColor(int color) {
+		this.color = color;
+		return this;
+	}
+
+	public WText setDarkmodeColor(int darkmodeColor) {
+		this.darkmodeColor = darkmodeColor;
+		return this;
+	}
+
+	public WText setColor(int color, int darkmodeColor) {
+		setColor(color);
+		setDarkmodeColor(darkmodeColor);
+		return this;
+	}
+
+	public WText disableDarkmode() {
+		this.darkmodeColor = this.color;
+		return this;
+	}
+}