113 lines
3.4 KiB
Java
113 lines
3.4 KiB
Java
package net.minecraft.client.gui.components;
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import net.fabricmc.api.EnvType;
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import net.fabricmc.api.Environment;
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import net.minecraft.client.gui.GuiGraphics;
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import net.minecraft.client.renderer.RenderPipelines;
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import net.minecraft.network.chat.Component;
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import net.minecraft.resources.ResourceLocation;
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import net.minecraft.util.Mth;
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@Environment(EnvType.CLIENT)
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public abstract class AbstractScrollArea extends AbstractWidget {
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public static final int SCROLLBAR_WIDTH = 6;
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private double scrollAmount;
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private static final ResourceLocation SCROLLER_SPRITE = ResourceLocation.withDefaultNamespace("widget/scroller");
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private static final ResourceLocation SCROLLER_BACKGROUND_SPRITE = ResourceLocation.withDefaultNamespace("widget/scroller_background");
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private boolean scrolling;
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public AbstractScrollArea(int x, int y, int width, int height, Component message) {
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super(x, y, width, height, message);
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}
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@Override
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public boolean mouseScrolled(double mouseX, double mouseY, double scrollX, double scrollY) {
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if (!this.visible) {
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return false;
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} else {
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this.setScrollAmount(this.scrollAmount() - scrollY * this.scrollRate());
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return true;
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}
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}
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@Override
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public boolean mouseDragged(double mouseX, double mouseY, int button, double dragX, double dragY) {
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if (this.scrolling) {
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if (mouseY < this.getY()) {
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this.setScrollAmount(0.0);
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} else if (mouseY > this.getBottom()) {
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this.setScrollAmount(this.maxScrollAmount());
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} else {
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double d = Math.max(1, this.maxScrollAmount());
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int i = this.scrollerHeight();
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double e = Math.max(1.0, d / (this.height - i));
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this.setScrollAmount(this.scrollAmount() + dragY * e);
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}
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return true;
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} else {
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return super.mouseDragged(mouseX, mouseY, button, dragX, dragY);
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}
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}
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@Override
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public void onRelease(double mouseX, double mouseY) {
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this.scrolling = false;
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}
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public double scrollAmount() {
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return this.scrollAmount;
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}
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public void setScrollAmount(double scrollAmount) {
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this.scrollAmount = Mth.clamp(scrollAmount, 0.0, (double)this.maxScrollAmount());
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}
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public boolean updateScrolling(double mouseX, double mouseY, int button) {
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this.scrolling = this.scrollbarVisible()
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&& this.isValidClickButton(button)
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&& mouseX >= this.scrollBarX()
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&& mouseX <= this.scrollBarX() + 6
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&& mouseY >= this.getY()
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&& mouseY < this.getBottom();
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return this.scrolling;
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}
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public void refreshScrollAmount() {
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this.setScrollAmount(this.scrollAmount);
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}
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public int maxScrollAmount() {
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return Math.max(0, this.contentHeight() - this.height);
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}
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protected boolean scrollbarVisible() {
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return this.maxScrollAmount() > 0;
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}
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protected int scrollerHeight() {
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return Mth.clamp((int)((float)(this.height * this.height) / this.contentHeight()), 32, this.height - 8);
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}
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protected int scrollBarX() {
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return this.getRight() - 6;
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}
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protected int scrollBarY() {
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return Math.max(this.getY(), (int)this.scrollAmount * (this.height - this.scrollerHeight()) / this.maxScrollAmount() + this.getY());
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}
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protected void renderScrollbar(GuiGraphics guiGraphics) {
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if (this.scrollbarVisible()) {
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int i = this.scrollBarX();
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int j = this.scrollerHeight();
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int k = this.scrollBarY();
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guiGraphics.blitSprite(RenderPipelines.GUI_TEXTURED, SCROLLER_BACKGROUND_SPRITE, i, this.getY(), 6, this.getHeight());
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guiGraphics.blitSprite(RenderPipelines.GUI_TEXTURED, SCROLLER_SPRITE, i, k, 6, j);
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}
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}
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protected abstract int contentHeight();
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protected abstract double scrollRate();
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}
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