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Mousewheel support #7

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Mousewheel support #7

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68 changes: 67 additions & 1 deletion src/primitives/TouchableArea.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,78 @@
var React = require('react');

var TouchableArea = React.createClass({
getInitialState: function() {
return {
cumulativeScroll: {x:0, y:0},
gestureStart: {x:0, y:0},
isMouseWheeling: false,
};
},

getDefaultProps: function() {
return {
component: React.DOM.div,
touchable: true
};
},

handleWheel: function(e) {
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@iamdustan iamdustan Jul 17, 2014

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TODO:

  • check for a maximum extend from boundary and fire scroll.doTouchEnd at that point.
  • eat all remaining intertial scroll events

if (!this.props.scroller || !this.props.touchable) {
return;
}

if (e.timeStamp) {
this.state.lastTimeStamp = e.timeStamp;
}

var self = this;
var timeStamp = e.timeStamp || this.state.lastTimeStamp;
var scrollDeltaX, scrollDeltaY;
if (!this.state.isMouseWheeling) {
this.state.isMouseWheeling = true;
this.state.cumulativeScroll.x = 0;
this.state.cumulativeScroll.y = 0;

// Start a scroll event
this.props.scroller.doTouchStart([{
pageX: 0,
pageY: 0,
}], e.timeStamp);
return;
}

// Convert the scrollwheel values to a scroll value
scrollDeltaX = e.deltaX / 2;
scrollDeltaY = -e.deltaY / 2;

// If the scroller is constrained to an x axis, convert y scroll to allow single-axis scroll
// wheels to scroll constrained content.
if (this.props.scrollAxis === 'x') {
scrollDeltaX = scrollDeltaY;
scrollDeltaY = 0;
}

this.state.cumulativeScroll.x = Math.round(this.state.cumulativeScroll.x + scrollDeltaX);
this.state.cumulativeScroll.y = Math.round(this.state.cumulativeScroll.y + scrollDeltaY);

var pageX = -this.state.gestureStart.x + this.state.cumulativeScroll.x;
var pageY = this.state.gestureStart.y + this.state.cumulativeScroll.y;

this.props.scroller.doTouchMove([{pageX: pageX, pageY: pageY}], timeStamp);

//_updateScroll(_gestureStart.x + _cumulativeScroll.x, _gestureStart.y + _cumulativeScroll.y, event.timeStamp, event);

// End scrolling state
if (this.state._scrollWheelEndDebouncer) {
clearTimeout(this.state._scrollWheelEndDebouncer);
}
this.state._scrollWheelEndDebouncer = setTimeout(function () {
self.props.scroller.doTouchEnd(timeStamp);
//_releaseInputCapture();
self.state.isMouseWheeling = false;
}, 300);
},

handleTouchStart: function(e) {
if (!this.props.scroller || !this.props.touchable) {
return;
Expand Down Expand Up @@ -41,6 +106,7 @@ var TouchableArea = React.createClass({
var component = this.props.component;
return this.transferPropsTo(
<component
onWheel={this.handleWheel}
onTouchStart={this.handleTouchStart}
onTouchMove={this.handleTouchMove}
onTouchEnd={this.handleTouchEnd}
Expand All @@ -51,4 +117,4 @@ var TouchableArea = React.createClass({
}
});

module.exports = TouchableArea;
module.exports = TouchableArea;