106 lines
2.5 KiB
JavaScript
Vendored
106 lines
2.5 KiB
JavaScript
Vendored
class MouseInteraction
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{
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constructor(node)
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{
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this.node = node;
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// Current interaction state
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this.mouseDown = false;
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this.lastMouseState = null;
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this.mouseMoved = false;
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// Empty user handlers
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this.onClickHandler = null;
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this.onMoveHandler = null;
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this.onHoverHandler = null;
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this.onScrollHandler = null;
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// Setup DOM handlers
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DOM.Event.AddHandler(this.node, "mousedown", (evt) => this._OnMouseDown(evt));
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DOM.Event.AddHandler(this.node, "mouseup", (evt) => this._OnMouseUp(evt));
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DOM.Event.AddHandler(this.node, "mousemove", (evt) => this._OnMouseMove(evt));
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DOM.Event.AddHandler(this.node, "mouseleave", (evt) => this._OnMouseLeave(evt));
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// Mouse wheel is a little trickier
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const mouse_wheel_event = (/Firefox/i.test(navigator.userAgent)) ? "DOMMouseScroll" : "mousewheel";
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DOM.Event.AddHandler(this.node, mouse_wheel_event, (evt) => this._OnMouseScroll(evt));
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}
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_OnMouseDown(evt)
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{
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this.mouseDown = true;
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this.lastMouseState = new Mouse.State(evt);
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this.mouseMoved = false;
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DOM.Event.StopDefaultAction(evt);
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}
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_OnMouseUp(evt)
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{
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const mouse_state = new Mouse.State(evt);
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this.mouseDown = false;
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// Chain to on click event when released without movement
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if (!this.mouseMoved)
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{
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if (this.onClickHandler)
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{
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this.onClickHandler(mouse_state);
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}
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}
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}
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_OnMouseMove(evt)
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{
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const mouse_state = new Mouse.State(evt);
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if (this.mouseDown)
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{
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// Has the mouse moved while being held down?
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const move_offset_x = mouse_state.Position[0] - this.lastMouseState.Position[0];
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const move_offset_y = mouse_state.Position[1] - this.lastMouseState.Position[1];
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if (move_offset_x != 0 || move_offset_y != 0)
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{
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this.mouseMoved = true;
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// Chain to move handler
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if (this.onMoveHandler)
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{
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this.onMoveHandler(mouse_state, move_offset_x, move_offset_y);
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}
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}
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}
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// Chain to hover handler
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else if (this.onHoverHandler)
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{
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this.onHoverHandler(mouse_state);
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}
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this.lastMouseState = mouse_state;
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}
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_OnMouseLeave(evt)
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{
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// Cancel panning
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this.mouseDown = false;
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// Cancel hovering
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if (this.onHoverHandler)
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{
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this.onHoverHandler(null);
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}
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}
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_OnMouseScroll(evt)
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{
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const mouse_state = new Mouse.State(evt);
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if (this.onScrollHandler)
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{
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this.onScrollHandler(mouse_state);
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// Prevent vertical scrolling on mouse-wheel
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DOM.Event.StopDefaultAction(evt);
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}
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}
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};
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