Ok, I think you can do it like this. I’ve just taken a look at an old app and I think it works like this so give it a try and see if it works. It uses Hammer.js
If it doesn’t work as expected, then let me know and I’ll try and do a demo.
Hammer.JS - Hammer.js
Create a workflow that runs when your group/image or whatever becomes visible and add a run javascript action.
hammerIt(document.getElementById("slideshow_a"));
You’ll notice it uses an element ID in that, so add that to your image/group element like so.
I used the slideshow plugin but hopefully it will work with other bubble elements.
Now add this HTML element to your page. Don’t change the code, just copy and paste it.
When your image element becomes visible, the javascript action will run, run the function below and hopefully you’ll be able to pinch zoom into that element.
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/hammer.js/2.0.8/hammer.js"></script>
<script>
function hammerIt(elm) {
hammertime = new Hammer(elm, {});
hammertime.get('pinch').set({
enable: true
});
var posX = 0,
posY = 0,
scale = 1,
last_scale = 1,
last_posX = 0,
last_posY = 0,
max_pos_x = 0,
max_pos_y = 0,
transform = "",
el = elm;
hammertime.on('doubletap pan pinch panend pinchend', function(ev) {
if (ev.type == "doubletap") {
transform =
"translate3d(0, 0, 0) " +
"scale3d(2, 2, 1) ";
scale = 2;
last_scale = 2;
try {
if (window.getComputedStyle(el, null).getPropertyValue('-webkit-transform').toString() != "matrix(1, 0, 0, 1, 0, 0)") {
transform =
"translate3d(0, 0, 0) " +
"scale3d(1, 1, 1) ";
scale = 1;
last_scale = 1;
}
} catch (err) {}
el.style.webkitTransform = transform;
transform = "";
}
//pan
if (scale != 1) {
posX = last_posX + ev.deltaX;
posY = last_posY + ev.deltaY;
max_pos_x = Math.ceil((scale - 1) * el.clientWidth / 2);
max_pos_y = Math.ceil((scale - 1) * el.clientHeight / 2);
if (posX > max_pos_x) {
posX = max_pos_x;
}
if (posX < -max_pos_x) {
posX = -max_pos_x;
}
if (posY > max_pos_y) {
posY = max_pos_y;
}
if (posY < -max_pos_y) {
posY = -max_pos_y;
}
}
//pinch
if (ev.type == "pinch") {
scale = Math.max(.999, Math.min(last_scale * (ev.scale), 4));
}
if(ev.type == "pinchend"){last_scale = scale;}
//panend
if(ev.type == "panend"){
last_posX = posX < max_pos_x ? posX : max_pos_x;
last_posY = posY < max_pos_y ? posY : max_pos_y;
}
if (scale != 1) {
transform =
"translate3d(" + posX + "px," + posY + "px, 0) " +
"scale3d(" + scale + ", " + scale + ", 1)";
}
if (transform) {
el.style.webkitTransform = transform;
}
});
}
</script>
</head>
</html>
