


How to use jQuery\'s draggable() and resizable() plugins with CSS transform scale on child elements?
Oct 27, 2024 am 10:51 AMjQuery Drag/Resize with CSS Transform Scale
This issue arises when applying a CSS transform with scaling to an element and then using jQuery's draggable() and resizable() plugins on children within that element. The problem is that the jQuery-based alterations appear "out of sync" with the mouse movements due to the applied scale.
Original Solution
A patched solution was found on StackOverflow that suggested modifying the jQuery plugin. Specifically, the _mouseStart() and _generatePosition() functions were altered to account for the scaling:
- Monkey-patched _mouseStart() to adjust the offset values by a factor equal to the scale applied.
- In _generatePosition(), the movement was adjusted based on the scale factor to ensure proper alignment of the dragged/resized elements.
Improved Solution
Subsequently, a more elegant solution was discovered that eliminates the need for modifying jQuery. This approach involves setting callback handlers for the resizable and draggable events:
Resizable:
$(this).resizable({ // Set very large and negative minWidth and minHeight minWidth: -(contentElem.width()) * 10, minHeight: -(contentElem.height()) * 10, resize: function(event, ui) { // Calculate the change in width and height var changeWidth = ui.size.width - ui.originalSize.width; var changeHeight = ui.size.height - ui.originalSize.height; // Adjust the new width and height by dividing the change by the zoomScale var newWidth = ui.originalSize.width + changeWidth / zoomScale; var newHeight = ui.originalSize.height + changeHeight / zoomScale; // Update the ui.size object with the adjusted values ui.size.width = newWidth; ui.size.height = newHeight; } });
Draggable:
$(this).draggable({ handle: '.drag-handle', // Specify a handle element for dragging start: function(event, ui) { // Reset the ui.position object to {left: 0, top: 0} at the start of the drag ui.position.left = 0; ui.position.top = 0; }, drag: function(event, ui) { // Calculate the change in left and top positions var changeLeft = ui.position.left - ui.originalPosition.left; var changeTop = ui.position.top - ui.originalPosition.top; // Adjust the new left and top positions by dividing the change by the zoomScale var newLeft = ui.originalPosition.left + changeLeft / zoomScale; var newTop = ui.originalPosition.top + changeTop / zoomScale; // Update the ui.position object with the adjusted values ui.position.left = newLeft; ui.position.top = newTop; } });
By using these callback handlers, the draggable and resizable elements will now function correctly within the scaled element without the need to modify jQuery or implement complex patching solutions.
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