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Fix slider calculations for common case

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This commit is contained in:
Dmitry Lyzo 2020-02-13 23:32:04 +03:00
parent 91c8776fbd
commit a0fa065667
1 changed files with 60 additions and 11 deletions
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71
src/elements/emby-slider/emby-slider.js
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@ -16,6 +16,62 @@ define(['browser', 'dom', 'layoutManager', 'keyboardnavigation', 'css!./emby-sli
}
}
/**
* Returns slider fraction corresponding to client position.
*
* @param {Object} range slider itself
* @param {number} clientX client X-coordinate
* @return {number} slider fraction
*/
function mapClientToFraction(range, clientX) {
var rect = range.sliderBubbleTrack.getBoundingClientRect();
var fraction = (clientX - rect.left) / rect.width;
// Snap to step
var valueRange = range.max - range.min;
if (range.step !== 'any' && valueRange !== 0) {
var step = (range.step || 1) / valueRange;
fraction = Math.round(fraction / step) * step;
}
return Math.min(Math.max(fraction, 0), 1);
}
/**
* Returns slider value corresponding to slider fraction.
*
* @param {Object} range slider itself
* @param {number} fraction slider fraction
* @return {number} slider value
*/
function mapFractionToValue(range, fraction) {
var value = (range.max - range.min) * fraction;
// Snap to step
if (range.step !== 'any') {
var step = range.step || 1;
value = Math.round(value / step) * step;
}
value += parseFloat(range.min);
return Math.min(Math.max(value, range.min), range.max);
}
/**
* Returns slider fraction corresponding to slider value.
*
* @param {Object} range slider itself
* @param {number} value slider value (snapped to step)
* @return {number} slider fraction
*/
function mapValueToFraction(range, value) {
var valueRange = range.max - range.min;
var fraction = valueRange !== 0 ? (value - range.min) / valueRange : 0;
return Math.min(Math.max(fraction, 0), 1);
}
function updateValues() {
// Do not update values when dragging with keyboard to keep current progress for reference
@ -61,7 +117,7 @@ define(['browser', 'dom', 'layoutManager', 'keyboardnavigation', 'css!./emby-sli
if (range.getBubbleText) {
value = range.getBubbleText(value);
} else {
value = Math.round(value);
value = mapFractionToValue(range, value / 100).toLocaleString();
}
value = '<h1 class="sliderBubbleText">' + value + '</h1>';
}
@ -134,7 +190,8 @@ define(['browser', 'dom', 'layoutManager', 'keyboardnavigation', 'css!./emby-sli
dom.addEventListener(this, 'input', function (e) {
this.dragging = true;
updateBubble(this, this.value, sliderBubble);
var bubbleValue = mapValueToFraction(this, this.value) * 100;
updateBubble(this, bubbleValue, sliderBubble);
if (hasHideClass) {
sliderBubble.classList.remove('hide');
@ -158,15 +215,7 @@ define(['browser', 'dom', 'layoutManager', 'keyboardnavigation', 'css!./emby-sli
dom.addEventListener(this, (window.PointerEvent ? 'pointermove' : 'mousemove'), function (e) {
if (!this.dragging) {
var rect = this.sliderBubbleTrack.getBoundingClientRect();
var clientX = e.clientX;
var bubbleValue = (clientX - rect.left) / rect.width;
bubbleValue *= 100;
if (this.step !== 0) {
bubbleValue = Math.round(bubbleValue / this.step) * this.step;
}
bubbleValue = Math.min(Math.max(bubbleValue, 0), 100);
var bubbleValue = mapClientToFraction(this, e.clientX) * 100;
updateBubble(this, bubbleValue, sliderBubble);