@visactor/vgrammar-core
Version:
VGrammar is a visual grammar library
53 lines (48 loc) • 1.83 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", {
value: !0
}), exports.ViewDragMixin = void 0;
const vutils_1 = require("@visactor/vutils"), view_utils_1 = require("./view-utils");
class ViewDragMixin {
_shouldTriggerDragByPointer(e) {
if (!(0, vutils_1.isNil)(e.pointerId)) {
const shouldStart = (0, vutils_1.isNil)(this._pointerId) || this._pointerId === e.pointerId;
return this._pointerId = e.pointerId, shouldStart;
}
return !0;
}
_shouldStart(e) {
return this._shouldTriggerDragByPointer(e);
}
_shouldUpdate(e) {
return this._shouldTriggerDragByPointer(e);
}
handleDragStart(e, navState, dragOptions) {
if (this._shouldStart(e)) return this._dragStart = {
x: e.canvasX,
y: e.canvasY
}, null;
}
handleDragUpdate(e, navState, dragOptions) {
if (this._dragStart && this._shouldUpdate(e)) {
if (null == dragOptions ? void 0 : dragOptions.realtime) {
const x = e.canvasX - this._dragStart.x, y = e.canvasY - this._dragStart.y;
return (0, view_utils_1.handleScrolling)({
x: x,
y: y
}, navState, dragOptions);
}
return null;
}
}
handleDragEnd(e, navState, dragOptions) {
if (!this._dragStart) return;
const res = !1 === (null == dragOptions ? void 0 : dragOptions.realtime) ? (0, view_utils_1.handleScrolling)({
x: e.canvasX - this._dragStart.x,
y: e.canvasY - this._dragStart.y
}, navState, dragOptions) : null;
return this._pointerId = null, this._dragStart = null, res;
}
}
exports.ViewDragMixin = ViewDragMixin;
//# sourceMappingURL=view-drag-mixin.js.map