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-rw-r--r--src/main/java/io/github/cottonmc/cotton/gui/widget/WScrollPanel.java115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/main/java/io/github/cottonmc/cotton/gui/widget/WScrollPanel.java b/src/main/java/io/github/cottonmc/cotton/gui/widget/WScrollPanel.java
new file mode 100644
index 0000000..bd91f06
--- /dev/null
+++ b/src/main/java/io/github/cottonmc/cotton/gui/widget/WScrollPanel.java
@@ -0,0 +1,115 @@
+package io.github.cottonmc.cotton.gui.widget;
+
+import io.github.cottonmc.cotton.gui.GuiDescription;
+import io.github.cottonmc.cotton.gui.widget.data.Axis;
+import net.minecraft.client.util.math.MatrixStack;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Similar to the JScrollPane in Swing, this widget represents a vertically scrollable list of widgets.
+ *
+ * @since 2.0.0
+ */
+public class WScrollPanel extends WClippedPanel {
+ /**
+ * The spacing between widgets.
+ */
+ protected int spacing = 4;
+
+ /**
+ * The scroll bar of this panel.
+ */
+ protected WScrollBar scrollBar = new WScrollBar(Axis.VERTICAL);
+
+ private int lastScroll = -1;
+
+ // The list of *all* children as opposed to visible children, excluding the scroll bar.
+ private final List<WWidget> allChildren = new ArrayList<>();
+
+ public WScrollPanel() {
+ scrollBar.setParent(this);
+ children.add(scrollBar);
+ }
+
+ public void add(WWidget widget, int width, int height) {
+ widget.setParent(this);
+ allChildren.add(widget);
+ children.add(widget);
+ if (canResize()) {
+ widget.setSize(width, height);
+ }
+ }
+
+ public void add(WWidget widget) {
+ add(widget, 18, 18);
+ }
+
+ @Override
+ public void paint(MatrixStack matrices, int x, int y, int mouseX, int mouseY) {
+ if (scrollBar.getValue() != lastScroll) {
+ layout();
+ lastScroll = scrollBar.getValue();
+ }
+
+ super.paint(matrices, x, y, mouseX, mouseY);
+ }
+
+ @Override
+ public void layout() {
+ children.clear();
+ scrollBar.setLocation(this.width - scrollBar.getWidth(), 0);
+ scrollBar.setSize(8, this.height);
+
+ int offset = scrollBar.getValue();
+ int height = 0;
+
+ for (int i = 0; i < allChildren.size(); i++) {
+ WWidget child = allChildren.get(i);
+ int minY = height - offset;
+ child.setLocation(0, minY);
+ int maxY = minY + child.getHeight();
+
+ if ((minY >= 0 && minY < getHeight()) || (maxY >= 0 && maxY < getHeight()) || (minY < 0 && maxY >= getHeight())) {
+ children.add(child);
+ }
+
+ if (i != allChildren.size() - 1) {
+ height += spacing;
+ }
+
+ height += child.getHeight();
+ }
+
+ children.add(scrollBar);
+ scrollBar.setWindow(Math.min(height / 4, 18));
+ scrollBar.setMaxValue(height);
+ }
+
+ @Override
+ public void validate(GuiDescription c) {
+ for (WWidget child : allChildren) {
+ child.validate(c);
+ }
+ super.validate(c);
+ }
+
+ @Override
+ public void createPeers(GuiDescription c) {
+ super.createPeers(c);
+ for (WWidget child : allChildren) {
+ child.createPeers(c);
+ }
+ }
+
+ public int getSpacing() {
+ return spacing;
+ }
+
+ public WScrollPanel setSpacing(int spacing) {
+ this.spacing = spacing;
+
+ return this;
+ }
+}