2 files changed, 122 insertions, 0 deletions
diff --git a/src/main/java/io/github/cottonmc/cotton/gui/widget/WSlider.java b/src/main/java/io/github/cottonmc/cotton/gui/widget/WSlider.java
new file mode 100644
index 0000000..ee0ce3a
--- /dev/null
+++ b/src/main/java/io/github/cottonmc/cotton/gui/widget/WSlider.java
@@ -0,0 +1,122 @@
+package io.github.cottonmc.cotton.gui.widget;
+
+import io.github.cottonmc.cotton.gui.client.ScreenDrawing;
+import net.minecraft.util.Identifier;
+
+import javax.annotation.Nullable;
+import java.util.function.IntConsumer;
+
+public class WSlider extends WWidget {
+	private static final int TRACK_WIDTH = 6;
+	private static final int THUMB_SIZE = 8;
+	// TODO: Horizontal textures
+	private static final Identifier TEXTURE = new Identifier("libgui", "textures/widget/slider.png");
+
+	private final int min, max;
+	private final int valueRange;
+	private final Axis axis;
+
+	private int value;
+	private float valueToCoordRatio, coordToValueRatio;
+	@Nullable private IntConsumer valueChangeListener = null;
+	@Nullable private Runnable mouseReleaseListener = null;
+	private boolean dragging = false;
+
+	public WSlider(int min, int max, Axis axis) {
+		this.min = min;
+		this.max = max;
+		this.valueRange = max - min + 1;
+		this.axis = axis;
+		this.value = min;
+	}
+
+	public WSlider(int max, Axis axis) {
+		this(0, max, axis);
+	}
+
+	@Override
+	public void setSize(int x, int y) {
+		super.setSize(x, y);
+		// FIXME: that - and + stuff fixes the rendering but causes range issues (too large for X and too small for Y)
+		int trackHeight = (axis == Axis.HORIZONTAL ? (x - THUMB_SIZE) : (y + THUMB_SIZE));
+		valueToCoordRatio = (float) valueRange / trackHeight;
+		coordToValueRatio = 1 / valueToCoordRatio;
+	}
+
+	@Override
+	public boolean canResize() {
+		return true;
+	}
+
+	@Override
+	public void onMouseDrag(int x, int y, int button) {
+		// a = mouse coordinate on slider axis, axisWidth = width of slider axis
+		// ao = axis-opposite mouse coordinate, aoCenter = center of ao's axis
+		int a = axis == Axis.HORIZONTAL ? x : y;
+		int axisWidth = axis == Axis.HORIZONTAL ? width : height;
+		int ao = axis == Axis.HORIZONTAL ? y : x;
+		int aoCenter = (axis == Axis.HORIZONTAL ? height : width) / 2;
+		if (dragging || ao >= aoCenter - TRACK_WIDTH / 2 && ao <= aoCenter + TRACK_WIDTH / 2) {
+			dragging = true;
+			int pos = axis == Axis.VERTICAL ? (axisWidth - a + THUMB_SIZE / 2) : (a - THUMB_SIZE / 2);
+			value = min + (int) (valueToCoordRatio * pos);
+			if (valueChangeListener != null) valueChangeListener.accept(value);
+		}
+	}
+
+	@Override
+	public void onClick(int x, int y, int button) {
+		onMouseDrag(x, y, button);
+		onMouseUp(x, y, button);
+	}
+
+	@Override
+	public WWidget onMouseUp(int x, int y, int button) {
+		dragging = false;
+		if (mouseReleaseListener != null) mouseReleaseListener.run();
+
+		return super.onMouseUp(x, y, button);
+	}
+
+	@Override
+	public void paintBackground(int x, int y) {
+		float px = 1 / 16f;
+		if (axis == Axis.VERTICAL) {
+			int trackX = x + width / 2 - TRACK_WIDTH / 2;
+			int thumbY = y + height - (int) (coordToValueRatio * (value - min));
+
+			ScreenDrawing.rect(TEXTURE, trackX, y + 1,      TRACK_WIDTH, 1,          0*px, 8*px,  6*px, 9*px,  0xFFFFFFFF);
+			ScreenDrawing.rect(TEXTURE, trackX, y + 2,      TRACK_WIDTH, height - 2, 0*px, 9*px,  6*px, 10*px, 0xFFFFFFFF);
+			ScreenDrawing.rect(TEXTURE, trackX, y + height, TRACK_WIDTH, 1,          0*px, 10*px, 6*px, 11*px, 0xFFFFFFFF);
+
+			ScreenDrawing.rect(TEXTURE, x + width / 2 - THUMB_SIZE / 2, thumbY, THUMB_SIZE, THUMB_SIZE, 0*px, 0*px, 8*px, 8*px, 0xFFFFFFFF);
+		} else {
+			int trackY = y + height / 2 - TRACK_WIDTH / 2;
+			int thumbX = x + (int) (coordToValueRatio * (value - min));
+
+			ScreenDrawing.rect(x, trackY, 1, TRACK_WIDTH, 0xFFFF0000);
+			ScreenDrawing.rect(x + 1, trackY, width - 2, TRACK_WIDTH, 0xFFFF0000);
+			ScreenDrawing.rect(x + width - 1, trackY, 1, TRACK_WIDTH, 0xFFFF0000);
+
+			ScreenDrawing.rect(thumbX, y + height / 2 - THUMB_SIZE / 2, THUMB_SIZE, THUMB_SIZE, 0xFF00FFFF);
+		}
+	}
+
+	public int getValue() {
+		return value;
+	}
+
+	public void setValue(int value) {
+		this.value = value;
+	}
+
+	public WSlider setValueChangeListener(@Nullable IntConsumer valueChangeListener) {
+		this.valueChangeListener = valueChangeListener;
+		return this;
+	}
+
+	public WSlider setMouseReleaseListener(@Nullable Runnable mouseReleaseListener) {
+		this.mouseReleaseListener = mouseReleaseListener;
+		return this;
+	}
+}
diff --git a/src/main/resources/assets/libgui/textures/widget/slider.png b/src/main/resources/assets/libgui/textures/widget/slider.png
new file mode 100644
index 0000000..8fbf16f
--- /dev/null
+++ b/src/main/resources/assets/libgui/textures/widget/slider.png