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implement momentum based scroll for touch

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RandomityGuy 2025-11-15 18:49:59 +00:00
parent ce64534bf2
commit a9ab72d5d3
2 changed files with 51 additions and 2 deletions
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2
src/MarbleGame.hx
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@ -167,7 +167,7 @@ class MarbleGame {
});
pointercontainer.addEventListener('touchend', (e:js.html.TouchEvent) -> {
// @:privateAccess Key.keyPressed[Key.MOUSE_LEFT] = -Key.getFrame();
@:privateAccess Key.keyPressed[Key.MOUSE_LEFT] = -Key.getFrame();
});
pointercontainer.addEventListener('touchmove', (e:js.html.TouchEvent) -> {

51
src/gui/GuiConsoleScrollCtrl.hx
View file

@ -10,6 +10,7 @@ import h2d.Tile;
import h2d.Graphics;
import src.MarbleGame;
import src.Util;
import haxe.Timer;
class GuiConsoleScrollCtrl extends GuiControl {
public var scrollY:Float = 0;
@ -43,6 +44,11 @@ class GuiConsoleScrollCtrl extends GuiControl {
var scrollUpButton:GuiButton;
var scrollDownButton:GuiButton;
var scrollVelocity:Float = 0;
var lastMoveStamp:Float = 0;
var momentumActive:Bool = false;
static inline var MOMENTUM_DAMPING:Float = 8;
public function new(scrollBar:Tile) {
super();
@ -261,6 +267,9 @@ class GuiConsoleScrollCtrl extends GuiControl {
this.dirty = true;
this.updateScrollVisual();
this.prevMousePos = mouseState.position;
this.scrollVelocity = 0;
this.momentumActive = false;
this.lastMoveStamp = Timer.stamp();
}
}
@ -269,6 +278,18 @@ class GuiConsoleScrollCtrl extends GuiControl {
this.pressed = false;
this.dirty = true;
this.updateScrollVisual();
this.momentumActive = Math.abs(scrollVelocity) > 0.01;
this.lastMoveStamp = 0;
}
}
public override function onMouseLeave(mouseState:MouseState) {
if (Util.isTouchDevice()) {
this.pressed = false;
this.dirty = true;
this.updateScrollVisual();
this.momentumActive = Math.abs(scrollVelocity) > 0.01;
this.lastMoveStamp = 0;
}
}
@ -276,14 +297,42 @@ class GuiConsoleScrollCtrl extends GuiControl {
if (Util.isTouchDevice()) {
super.onMouseMove(mouseState);
if (this.pressed) {
var dy = mouseState.position.y - this.prevMousePos.y;
var renderRect = this.getRenderRectangle();
var scrollExtentY = renderRect.extent.y - 34 * Settings.uiScale;
var dy = (mouseState.position.y - this.prevMousePos.y) / ((maxScrollY * Settings.uiScale) / scrollExtentY);
this.scrollY -= dy;
this.prevMousePos = mouseState.position;
var now = Timer.stamp();
if (lastMoveStamp > 0) {
var dt = now - lastMoveStamp;
if (dt > 0)
scrollVelocity = -dy / dt;
}
lastMoveStamp = now;
momentumActive = false;
this.updateScrollVisual();
}
}
}
public override function update(dt:Float, mouseState:MouseState) {
super.update(dt, mouseState);
if (!pressed && momentumActive) {
var damping = Math.exp(-MOMENTUM_DAMPING * dt);
scrollVelocity *= damping;
if (Math.abs(scrollVelocity) < 0.01) {
scrollVelocity = 0;
momentumActive = false;
return;
}
var before = scrollY;
scrollY += scrollVelocity * dt;
updateScrollVisual();
if (scrollY == 0 || scrollY == before)
momentumActive = false;
}
}
// public override function onMouseDown(mouseState:MouseState) {
// var renderRect = this.getHitTestRect();
// if (mouseState.position.x >= renderRect.position.x + renderRect.extent.x - 10) {