applyScale.jsx

// Create a new window for the UI
var myWindow = new Window("palette", "applyScale");

// Add a checkbox for resizing stroke width
var resizeStrokeCheckbox = myWindow.add("checkbox", undefined, "Resize Stroke Width");
var mathRoundText = myWindow.add("checkbox", undefined, "Math Round Text Size");
resizeStrokeCheckbox.value = true;

// Add a button to the window
var myButton = myWindow.add("button", undefined, "Adjust Scale");

// Define the button's onClick function
myButton.onClick = function() {
    // Get the selected layers
    var selectedLayers = app.project.activeItem.selectedLayers;

    // Begin an undo group
    app.beginUndoGroup("Adjust Scale");

    // Loop through each selected layer
    for (var i = 0; i < selectedLayers.length; i++) {
        var layer = selectedLayers[i];

        // Check if the layer is a text layer
        if (layer instanceof TextLayer) {
            // Get the current scale and font size
            var currentScale = layer.transform.scale.value[0]; // Assuming uniform scale
            var currentFontSize = layer.text.sourceText.value.fontSize;

            // Calculate the new font size
            var newFontSize = currentFontSize * currentScale / 100;
            if (mathRoundText.value) {
                newFontSize = Math.round(newFontSize)
            }
            // Set the scale to 100%
            layer.transform.scale.setValue([100, 100, 100]);

            // Create a new TextDocument with the updated font size
            var textDoc = layer.text.sourceText.value;
            textDoc.fontSize = newFontSize; // Update the font size
            
            // Check if the checkbox is selected before updating stroke width
            if (resizeStrokeCheckbox.value) {
                var currentStrokeWidth = layer.text.sourceText.value.strokeWidth;
                var newStrokeWidth = currentStrokeWidth * (currentScale / 100);
                if (mathRoundText.value) {
                    newStrokeWidth = Math.round(newStrokeWidth)
                }
                textDoc.strokeWidth = newStrokeWidth;
            }


            // Set the new TextDocument back to the layer
            layer.text.sourceText.setValue(textDoc);

        } else if (layer instanceof AVLayer && layer.source instanceof FootageItem && !layer.source.file) {
            // Get the current scale
            var currentXScale = layer.transform.scale.value[0];
            var currentYScale = layer.transform.scale.value[1];

            // Calculate the new size based on the scale
            var newWidth = Math.round(layer.source.width * (currentXScale / 100));
            var newHeight = Math.round(layer.source.height * (currentYScale / 100));

            // Reset scale to 100%
            layer.transform.scale.setValue([100, 100, 100]);

            // Update the solid source dimensions
            layer.source.width = newWidth;
            layer.source.height = newHeight;

        } else if (layer instanceof AVLayer && layer.source instanceof CompItem) {
            // Get the current scale
            var currentXScale = layer.transform.scale.value[0];
            var currentYScale = layer.transform.scale.value[1];

            // Calculate the new size based on the scale
            var newWidth = Math.round(layer.source.width * (currentXScale / 100));
            var newHeight = Math.round(layer.source.height * (currentYScale / 100));

            // Reset scale to 100%
            layer.transform.scale.setValue([100, 100, 100]);

            // Update the solid source dimensions
            layer.source.width = newWidth;
            layer.source.height = newHeight;
            alert(layer.name + " is a comp.")

        } else {
            // Set the scale to 100% for non-text layers
            alert(layer.name + " is not a solid or a text layer.")
        }
    }

    // End the undo group
    app.endUndoGroup();
};

// Show the window
myWindow.center();
myWindow.show();