1

uni_modules/uview-next/components/u-barcode/JsBarcode/renderers/shared.js

@@ -0,0 +1,94 @@
+import merge from "../help/merge.js";
+
+function getEncodingHeight(encoding, options){
+	return options.height +
+		((options.displayValue && encoding.text.length > 0) ? options.fontSize + options.textMargin : 0) +
+		options.marginTop +
+		options.marginBottom;
+}
+
+function getBarcodePadding(textWidth, barcodeWidth, options){
+	if(options.displayValue && barcodeWidth < textWidth){
+		if(options.textAlign == "center"){
+			return Math.floor((textWidth - barcodeWidth) / 2);
+		}
+		else if(options.textAlign == "left"){
+			return 0;
+		}
+		else if(options.textAlign == "right"){
+			return Math.floor(textWidth - barcodeWidth);
+		}
+	}
+	return 0;
+}
+
+function calculateEncodingAttributes(encodings, barcodeOptions, context){
+	for(let i = 0; i < encodings.length; i++){
+		var encoding = encodings[i];
+		var options = merge(barcodeOptions, encoding.options);
+
+		// Calculate the width of the encoding
+		var textWidth;
+		if(options.displayValue){
+			textWidth = messureText(encoding.text, options, context);
+		}
+		else{
+			textWidth = 0;
+		}
+
+		var barcodeWidth = encoding.data.length * options.width;
+		encoding.width =  Math.ceil(Math.max(textWidth, barcodeWidth));
+
+		encoding.height = getEncodingHeight(encoding, options);
+
+		encoding.barcodePadding = getBarcodePadding(textWidth, barcodeWidth, options);
+	}
+}
+
+function getTotalWidthOfEncodings(encodings){
+	var totalWidth = 0;
+	for(let i = 0; i < encodings.length; i++){
+		totalWidth += encodings[i].width;
+	}
+	return totalWidth;
+}
+
+function getMaximumHeightOfEncodings(encodings){
+	var maxHeight = 0;
+	for(let i = 0; i < encodings.length; i++){
+		if(encodings[i].height > maxHeight){
+			maxHeight = encodings[i].height;
+		}
+	}
+	return maxHeight;
+}
+
+function messureText(string, options, context){
+	var ctx;
+
+	if(context){
+		ctx = context;
+	}
+	else if(typeof document !== "undefined"){
+		ctx = document.createElement("canvas").getContext("2d");
+	}
+	else{
+		// If the text cannot be messured we will return 0.
+		// This will make some barcode with big text render incorrectly
+		return 0;
+	}
+	ctx.font = options.fontOptions + " " + options.fontSize + "px " + options.font;
+
+	// Calculate the width of the encoding
+	var measureTextResult = ctx.measureText(string);
+	if (!measureTextResult) {
+		// Some implementations don't implement measureText and return undefined.
+		// If the text cannot be measured we will return 0.
+		// This will make some barcode with big text render incorrectly
+		return 0;
+	}
+	var size = measureTextResult.width;
+	return size;
+}
+
+export {getMaximumHeightOfEncodings, getEncodingHeight, getBarcodePadding, calculateEncodingAttributes, getTotalWidthOfEncodings};