kevin/contain-element
1
0
Fork 0
mirror of https://github.com/WilliamsNY/contain-element.git synced 2024-12-17 22:08:23 -05:00
Code Issues Projects Releases Packages Wiki Activity

Replace tabs with (4) spaces

Browse source
This commit is contained in:
Kevin MacMartin 2015-09-04 14:15:36 -04:00
parent 52e1f93e4a
commit 9ea6f875b4
1 changed files with 67 additions and 67 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

134
contain-element.js
View file

@ -1,78 +1,78 @@
function ContainElement(options) { function ContainElement(options) {
var scaleFactor = 1; var scaleFactor = 1;
var element = document.getElementById(options.id); var element = document.getElementById(options.id);
var elementWidth = options.width || element.offsetWidth; var elementWidth = options.width || element.offsetWidth;
var elementHeight = options.height || element.offsetHeight; var elementHeight = options.height || element.offsetHeight;
// Apply required attributes to the element and its parents // Apply required attributes to the element and its parents
element.style.position = 'absolute'; element.style.position = 'absolute';
element.parentElement.style.overflow = 'hidden'; element.parentElement.style.overflow = 'hidden';
if (['relative', 'absolute', 'fixed'].indexOf(window.getComputedStyle(element.parentElement, null).getPropertyValue('position')) === -1) if (['relative', 'absolute', 'fixed'].indexOf(window.getComputedStyle(element.parentElement, null).getPropertyValue('position')) === -1)
element.parentElement.style.position = 'relative'; element.parentElement.style.position = 'relative';
function updateContain() { function updateContain() {
var parentWidth = element.parentElement.offsetWidth; var parentWidth = element.parentElement.offsetWidth;
var parentHeight = element.parentElement.offsetHeight; var parentHeight = element.parentElement.offsetHeight;
// Run the scale/position functionality if able to determine the parent element's width and height // Run the scale/position functionality if able to determine the parent element's width and height
if ((parentWidth) && (parentHeight)) { if ((parentWidth) && (parentHeight)) {
// Calculate the scale factor // Calculate the scale factor
if (parentWidth > ((parentHeight / (elementHeight * scaleFactor)) * (elementWidth * scaleFactor))) if (parentWidth > ((parentHeight / (elementHeight * scaleFactor)) * (elementWidth * scaleFactor)))
scaleFactor = (parentWidth / elementWidth); scaleFactor = (parentWidth / elementWidth);
else else
scaleFactor = (parentHeight / elementHeight); scaleFactor = (parentHeight / elementHeight);
// Scale the element using the scale factor // Scale the element using the scale factor
element.style.width = (elementWidth * scaleFactor) + 'px'; element.style.width = (elementWidth * scaleFactor) + 'px';
element.style.height = (elementHeight * scaleFactor) + 'px'; element.style.height = (elementHeight * scaleFactor) + 'px';
// Anchor the element horizontally to the left/center/right // Anchor the element horizontally to the left/center/right
if (parentWidth < (elementWidth * scaleFactor)) { if (parentWidth < (elementWidth * scaleFactor)) {
switch(options.halign) { switch(options.halign) {
case 'left': case 'left':
// Anchor horizontally to the left of the parent element // Anchor horizontally to the left of the parent element
element.style.left = 0 + 'px'; element.style.left = 0 + 'px';
break; break;
case 'right': case 'right':
// Anchor horizontally to the right of the parent element // Anchor horizontally to the right of the parent element
element.style.left = (0 - ((elementWidth * scaleFactor) - parentWidth)) + 'px'; element.style.left = (0 - ((elementWidth * scaleFactor) - parentWidth)) + 'px';
break; break;
default: default:
// Anchor horizontally to the center of the parent element // Anchor horizontally to the center of the parent element
element.style.left = (0 - (((elementWidth * scaleFactor) - parentWidth) / 2)) + 'px'; element.style.left = (0 - (((elementWidth * scaleFactor) - parentWidth) / 2)) + 'px';
} }
} else { } else {
element.style.left = 0 + 'px'; element.style.left = 0 + 'px';
} }
// Anchor the element vertically to the top/center/bottom // Anchor the element vertically to the top/center/bottom
if ((elementHeight * scaleFactor) > parentHeight) { if ((elementHeight * scaleFactor) > parentHeight) {
switch(options.valign) { switch(options.valign) {
case 'top': case 'top':
// Anchor vertically to the top of the parent element // Anchor vertically to the top of the parent element
element.style.top = 0 + 'px'; element.style.top = 0 + 'px';
break; break;
case 'bottom': case 'bottom':
// Anchor veritcally to the bottom of the parent element // Anchor veritcally to the bottom of the parent element
element.style.top = (0 - ((elementHeight * scaleFactor) - parentHeight)) + 'px'; element.style.top = (0 - ((elementHeight * scaleFactor) - parentHeight)) + 'px';
break; break;
default: default:
// Anchor vertically to the center of the parent element // Anchor vertically to the center of the parent element
element.style.top = (0 - (((elementHeight * scaleFactor) - parentHeight) / 2)) + 'px'; element.style.top = (0 - (((elementHeight * scaleFactor) - parentHeight) / 2)) + 'px';
} }
} else { } else {
element.style.top = 0 + 'px'; element.style.top = 0 + 'px';
} }
} else { } else {
// Try again in 30ms if the document didn't load enough to determine the parent element's width and height yet // Try again in 30ms if the document didn't load enough to determine the parent element's width and height yet
window.setTimeout(updateContain, 30); window.setTimeout(updateContain, 30);
} }
} }
// Run the function to scale and anchor the element // Run the function to scale and anchor the element
updateContain(); updateContain();
// Add an external scale and anchor update function // Add an external scale and anchor update function
this.update = updateContain; this.update = updateContain;
} }