Jquery Drag/Resize with CSS Transform Scale

jQuery Drag/Resize with CSS Transform Scale

It's been a while since this question was asked. I have found (actually created) an answer. All it requires is setting callback handlers. No editing jquery-ui needed!

Note: zoomScale in this example is a global variable and the transform is set using animate (aided by jquery.transform.js) like so:

target.animate({
    transform: 'scale(' + zoomScale + ')'
});

Take a look at this:

transform scale() fix for resizable:

$(this).resizable({
    minWidth: -(contentElem.width()) * 10,  // these need to be large and negative
    minHeight: -(contentElem.height()) * 10, // so we can shrink our resizable while scaled
    resize: function(event, ui) {

        var changeWidth = ui.size.width - ui.originalSize.width; // find change in width
        var newWidth = ui.originalSize.width + changeWidth / zoomScale; // adjust new width by our zoomScale

        var changeHeight = ui.size.height - ui.originalSize.height; // find change in height
        var newHeight = ui.originalSize.height + changeHeight / zoomScale; // adjust new height by our zoomScale

        ui.size.width = newWidth;
        ui.size.height = newHeight;

    }
});

transform scale() fix for draggable:

$(this).draggable({
    handle: '.drag-handle',
    start: function(event, ui) {
        ui.position.left = 0;
        ui.position.top = 0;
    },
    drag: function(event, ui) {

        var changeLeft = ui.position.left - ui.originalPosition.left; // find change in left
        var newLeft = ui.originalPosition.left + changeLeft / (( zoomScale)); // adjust new left by our zoomScale

        var changeTop = ui.position.top - ui.originalPosition.top; // find change in top
        var newTop = ui.originalPosition.top + changeTop / zoomScale; // adjust new top by our zoomScale

        ui.position.left = newLeft;
        ui.position.top = newTop;

    }
});

Let me know if you find any problems or further improvements on this. :)

Reference: jQuery-UI resizable/draggable with transform: scale() set

Dragging & Resizing CSS Transformed Elements

You can get the current transformation matrix that is applied to an element by using getComputedStyle(). You can use this to transform the current mouse position to its position in transformed space and see whether the click/drag events are within the element boundary and/or corners. Good resources for this:

http://www.useragentman.com/blog/2011/01/07/css3-matrix-transform-for-the-mathematically-challenged/

http://www.eleqtriq.com/2010/05/css-3d-matrix-transformations/

BTW, as you're experiencing, this is non-trivial to code. We had to do it for Sencha Animator, and it was a beast.

Dragging elements on a scaled div

Here are a few of my findings to make sure dragging on a scaled container works for method one. The only caveat is to make sure you have var percent as the scaled percentage declared before any of these actions happen.

First, use this code at the top of your javascript. This wil help making sure that the droppable area works with a sacled container.

$.ui.ddmanager.prepareOffsets = function( t, event ) { var i, j, m = $.ui.ddmanager.droppables[ t.options.scope ] || [], type = event ? event.type : null, list = ( t.currentItem || t.element ).find( ":data(ui-droppable)" ).addBack(); droppablesLoop: for ( i = 0; i < m.length; i++ ) { if ( m[ i ].options.disabled || ( t && !m[ i ].accept.call( m[ i ].element[ 0 ], ( t.currentItem || t.element ) ) ) ) { continue; } for ( j = 0; j < list.length; j++ ) { if ( list[ j ] === m[ i ].element[ 0 ] ) { m[ i ].proportions().height = 0; continue droppablesLoop; }  } m[ i ].visible = m[ i ].element.css( "display" ) !== "none"; if ( !m[ i ].visible ) { continue; } if ( type === "mousedown" ) { m[ i ]._activate.call( m[ i ], event ); } m[ i ].offset = m[ i ].element.offset(); m[ i ].proportions({ width: m[ i ].element[ 0 ].offsetWidth * percent, height: m[ i ].element[ 0 ].offsetHeight * percent }); } };

Here are a few functions that are necessary to fix the drag so it works on a scaled container.

function dragFix(event, ui) { var changeLeft = ui.position.left - ui.originalPosition.left, newLeft = ui.originalPosition.left + changeLeft / percent, changeTop = ui.position.top - ui.originalPosition.top, newTop = ui.originalPosition.top + changeTop / percent; ui.position.left = newLeft; ui.position.top = newTop; }

function startFix(event, ui) { ui.position.left = 0; ui.position.top = 0;  var element = $(this); }

You will want this if you want to enable the element to be resizable on a scaled container.

function resizeFix(event, ui) { var changeWidth = ui.size.width - ui.originalSize.width, newWidth = ui.originalSize.width + changeWidth / percent, changeHeight = ui.size.height - ui.originalSize.height, newHeight = ui.originalSize.height + changeHeight / percent;  ui.size.width = newWidth; ui.size.height = newHeight; }

To make an element draggable, I use the following function.

$("ELEMENT").resizable({ minWidth: - ($(this).width()) * 10, minHeight: - ($(this).height()) * 10, resize: resizeFix, start: startFix });
$("ELEMENT").draggable({ cursor: "move", start: startFix, drag: dragFix }); }

JQuery CSS Transform Scale Property not working

I've actually tested below and seems to be working?

$('.sc-bar').css('transform','scaleY(0.5)');

Is the line enclose on $(document).ready() or made sure that jQuery is loaded before using this like below?

// A $( document ).ready() block.
$(document).ready(function() {
    // your code here...
    $('.sc-bar').css('transform','scaleY(0.5)');
});

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