Adds mouse wheel (and, thus two-finger drag on OS X) pan support to the canvas
| 15 | public class Scrolling extends Box { |
| 16 | |
| 17 | public Scrolling(Box root_unused) { |
| 18 | this.properties.put(Planes.plane, "__always__"); |
| 19 | this.properties.putToMap(Mouse.onMouseScroll, "__scrolling__", e -> { |
| 20 | |
| 21 | if (e.properties.isTrue(FieldBoxWindow.consumed, false)) return; |
| 22 | |
| 23 | Log.log("scrolling", () -> "not consumed"); |
| 24 | if (e.after.dwheel != 0 || e.after.dwheely != 0) { |
| 25 | this.find(Drawing.drawing, this.both()) |
| 26 | .findFirst() |
| 27 | .ifPresent(x -> |
| 28 | scrollForMouseEvent(Scrolling.this, e, x)); |
| 29 | } |
| 30 | }); |
| 31 | } |
| 32 | |
| 33 | static public void scrollForMouseEvent(Box from, Window.Event<Window.MouseState> e, Drawing x) { |
| 34 | |
| 35 | if (e.after.keyboardState.isShiftDown()) { |
| 36 | Vec2 t = new Vec2(x.getScale()); |
| 37 | |
| 38 | Vec2 dm = new Vec2(e.after.mx, e.after.my); |
| 39 | |
| 40 | Vec2 d = new Vec2(e.after.x, e.after.y); |
| 41 | |
| 42 | |
| 43 | double sc = x.getScale().x; |
| 44 | |
| 45 | t.x = t.y = t.y * Math.pow(2, e.after.dwheely / 50f); |
| 46 | |
| 47 | t.x = Math.max(0.02f, Math.min(50, t.x)); |
| 48 | t.y = Math.max(0.02f, Math.min(50, t.y)); |
| 49 | |
| 50 | x.setScale(from, t); |
| 51 | |
| 52 | double r = (t.x / sc); |
| 53 | |
| 54 | Vec2 trans; |
| 55 | { |
| 56 | Vec2 dm2 = windowSystemToDrawingSystem(d, t, x.getTranslation()); |
| 57 | x.setTranslation(from, trans = x.getTranslation().add(new Vec2(dm).sub(dm2).mul(-t.x))); |
| 58 | } |
| 59 | } else { |
| 60 | Vec2 t = x.getTranslation(); |
| 61 | |
| 62 | double sc = x.getScale().x; |
| 63 | |
| 64 | t.x += e.after.dwheel * 8; |
| 65 | t.y += e.after.dwheely * 8; |
| 66 | |
| 67 | x.setTranslation(from, t); |
| 68 | } |
| 69 | |
| 70 | FrameManipulation.continueTranslationFeedback(from, false); |
| 71 | |
| 72 | } |
| 73 | |
| 74 | /** |