1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
export namespace DragManager {
export function Root() {
const root = document.getElementById("root");
if (!root) {
throw new Error("No root element found");
}
return root;
}
let dragDiv: HTMLDivElement;
export enum DragButtons {
Left = 1, Right = 2, Both = Left | Right
}
interface DragOptions {
handlers: DragHandlers;
hideSource: boolean | (() => boolean);
}
export interface DragDropDisposer {
(): void;
}
export class DragCompleteEvent {
}
export interface DragHandlers {
dragComplete: (e: DragCompleteEvent) => void;
}
export interface DropOptions {
handlers: DropHandlers;
}
export class DropEvent {
constructor(readonly x: number, readonly y: number, readonly data: { [id: string]: any }) { }
}
export interface DropHandlers {
drop: (e: Event, de: DropEvent) => void;
}
export function MakeDropTarget(element: HTMLElement, options: DropOptions): DragDropDisposer {
if ("canDrop" in element.dataset) {
throw new Error("Element is already droppable, can't make it droppable again");
}
element.dataset["canDrop"] = "true";
const handler = (e: Event) => {
const ce = e as CustomEvent<DropEvent>;
options.handlers.drop(e, ce.detail);
};
element.addEventListener("dashOnDrop", handler);
return () => {
element.removeEventListener("dashOnDrop", handler);
delete element.dataset["canDrop"]
};
}
let _lastPointerX: number = 0;
let _lastPointerY: number = 0;
export function StartDrag(ele: HTMLElement, dragData: { [id: string]: any }, options: DragOptions) {
if (!dragDiv) {
dragDiv = document.createElement("div");
DragManager.Root().appendChild(dragDiv);
}
const w = ele.offsetWidth, h = ele.offsetHeight;
const rect = ele.getBoundingClientRect();
const scaleX = rect.width / w, scaleY = rect.height / h;
let x = rect.left, y = rect.top;
// const offsetX = e.x - rect.left, offsetY = e.y - rect.top;
let dragElement = ele.cloneNode(true) as HTMLElement;
dragElement.style.opacity = "0.7";
dragElement.style.position = "absolute";
dragElement.style.transformOrigin = "0 0";
dragElement.style.zIndex = "1000";
dragElement.style.transform = `translate(${x}px, ${y}px) scale(${scaleX}, ${scaleY})`;
dragElement.style.width = `${rect.width / scaleX}px`;
dragElement.style.height = `${rect.height / scaleY}px`;
// It seems like the above code should be able to just be this:
// dragElement.style.transform = `translate(${x}px, ${y}px)`;
// dragElement.style.width = `${rect.width}px`;
// dragElement.style.height = `${rect.height}px`;
dragDiv.appendChild(dragElement);
let hideSource = false;
if (typeof options.hideSource === "boolean") {
hideSource = options.hideSource;
} else {
hideSource = options.hideSource();
}
const wasHidden = ele.hidden;
if (hideSource) {
ele.hidden = true;
}
const moveHandler = (e: PointerEvent) => {
e.stopPropagation();
e.preventDefault();
x += e.movementX;
y += e.movementY;
dragElement.style.transform = `translate(${x}px, ${y}px) scale(${scaleX}, ${scaleY})`;
};
const upHandler = (e: PointerEvent) => {
document.removeEventListener("pointermove", moveHandler, true);
document.removeEventListener("pointerup", upHandler);
FinishDrag(dragElement, e, options, dragData);
if (hideSource && !wasHidden) {
ele.hidden = false;
}
};
document.addEventListener("pointermove", moveHandler, true);
document.addEventListener("pointerup", upHandler);
}
function FinishDrag(dragEle: HTMLElement, e: PointerEvent, options: DragOptions, dragData: { [index: string]: any }) {
dragDiv.removeChild(dragEle);
const target = document.elementFromPoint(e.x, e.y);
if (!target) {
return;
}
target.dispatchEvent(new CustomEvent<DropEvent>("dashOnDrop", {
bubbles: true,
detail: {
x: e.x,
y: e.y,
data: dragData
}
}));
options.handlers.dragComplete({});
}
}
|
