ZenBrowserMirrors/pdf.js
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Simplified wheel processing.

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This commit is contained in:
Yury Delendik 2016-09-27 15:27:42 -05:00
parent 6c263c1994
commit 223a18ccc8
3 changed files with 56 additions and 31 deletions
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23
web/ui_utils.js
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@ -384,6 +384,28 @@ function getPDFFileNameFromURL(url) {
return suggestedFilename || 'document.pdf';
}
function normalizeWheelEventDelta(evt) {
var delta = Math.sqrt(evt.deltaX * evt.deltaX + evt.deltaY * evt.deltaY);
var angle = Math.atan2(evt.deltaY, evt.deltaX);
if (-0.25 * Math.PI < angle && angle < 0.75 * Math.PI) {
// All that is left-up oriented has to change the sign.
delta = -delta;
}
var MOUSE_DOM_DELTA_PIXEL_MODE = 0;
var MOUSE_DOM_DELTA_LINE_MODE = 1;
var MOUSE_PIXELS_PER_LINE = 30;
var MOUSE_LINES_PER_PAGE = 30;
// Converts delta to per-page units
if (evt.deltaMode === MOUSE_DOM_DELTA_PIXEL_MODE) {
delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE;
} else if (evt.deltaMode === MOUSE_DOM_DELTA_LINE_MODE) {
delta /= MOUSE_LINES_PER_PAGE;
}
return delta;
}
/**
* Simple event bus for an application. Listeners are attached using the
* `on` and `off` methods. To raise an event, the `dispatch` method shall be
@ -529,4 +551,5 @@ exports.getOutputScale = getOutputScale;
exports.scrollIntoView = scrollIntoView;
exports.watchScroll = watchScroll;
exports.binarySearchFirstItem = binarySearchFirstItem;
exports.normalizeWheelEventDelta = normalizeWheelEventDelta;
}));