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feat(scroll): enhance vertical scrolling logic with input revision tracking and clamped position updates

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extio-de
2026-03-24 22:07:01 +01:00
parent 6c469ba79f
commit ec6f112dda
1 changed files with 41 additions and 6 deletions
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49
src/main/java/de/extio/game_engine/renderer/container/ScrollArea.java
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@@ -4,9 +4,6 @@ import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import de.extio.game_engine.event.EventService;
import de.extio.game_engine.renderer.model.RenderingBo;
import de.extio.game_engine.renderer.model.RenderingBoHasDimension;
@@ -51,6 +48,8 @@ public class ScrollArea implements WindowComponent {
protected double scrollPositionHorizontal = 0.0;
protected int verticalScrollInputRevision = 0;
public ScrollArea(final RenderingBoPool renderingBoPool, final EventService eventService) {
this.renderingBoPool = renderingBoPool;
this.eventService = eventService;
@@ -71,7 +70,7 @@ public class ScrollArea implements WindowComponent {
protected void onScrollbarControlEvent(final UiControlEvent event) {
if (this.verticalScrollbarName.equals(event.getId())) {
final double rawValue = ((Double) event.getPayload()).doubleValue();
this.scrollPositionVertical = rawValue;
this.updateVerticalScrollPosition(rawValue, true);
this.parent.draw();
}
else if (this.horizontalScrollbarName.equals(event.getId())) {
@@ -97,7 +96,7 @@ public class ScrollArea implements WindowComponent {
final double scrollIncrement = Math.max(0.00001, Math.min(1.0, (double)this.relativeArea.getDimension().getY() / this.contentDimension.getY() / 5));
final double delta = event.getButton() == 4 ? scrollIncrement : -scrollIncrement;
this.scrollPositionVertical = Math.max(0.0, Math.min(1.0, this.scrollPositionVertical + delta));
this.updateVerticalScrollPosition(this.scrollPositionVertical + delta, true);
this.parent.draw();
}
}
@@ -185,11 +184,47 @@ public class ScrollArea implements WindowComponent {
return this.scrollPositionVertical;
}
public void setScrollPositionVertical(final double scrollPositionVertical) {
this.scrollPositionVertical = Math.max(0.0, Math.min(1.0, scrollPositionVertical));
public int getVerticalScrollOffset() {
final int maxOffset = this.getMaxVerticalScrollOffset();
if (maxOffset <= 0) {
return 0;
}
return (int) ((1.0 - this.scrollPositionVertical) * maxOffset);
}
public int getMaxVerticalScrollOffset() {
return Math.max(0, this.contentDimension.getY() - this.relativeArea.getDimension().getY() + SCROLLBAR_WIDTH_WITH_MARGIN);
}
public int getVerticalScrollInputRevision() {
return this.verticalScrollInputRevision;
}
public void setVerticalScrollOffset(final int verticalScrollOffset) {
final int maxOffset = this.getMaxVerticalScrollOffset();
if (maxOffset <= 0) {
this.updateVerticalScrollPosition(1.0, false);
this.draw();
return;
}
final int clampedOffset = Math.max(0, Math.min(maxOffset, verticalScrollOffset));
this.updateVerticalScrollPosition(1.0 - (double) clampedOffset / maxOffset, false);
this.draw();
}
public void setScrollPositionVertical(final double scrollPositionVertical) {
this.updateVerticalScrollPosition(scrollPositionVertical, false);
this.draw();
}
protected void updateVerticalScrollPosition(final double scrollPositionVertical, final boolean userInput) {
final double clampedScrollPositionVertical = Math.max(0.0, Math.min(1.0, scrollPositionVertical));
if (userInput && Double.compare(clampedScrollPositionVertical, this.scrollPositionVertical) != 0) {
this.verticalScrollInputRevision++;
}
this.scrollPositionVertical = clampedScrollPositionVertical;
}
public double getScrollPositionHorizontal() {
return this.scrollPositionHorizontal;
}