/* @VaadinApache2LicenseForJavaFiles@ */ package com.vaadin.terminal.gwt.client; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.user.client.Element; public class ComputedStyle { protected final JavaScriptObject computedStyle; private final Element elem; /** * Gets this element's computed style object which can be used to gather * information about the current state of the rendered node. *

* Note that this method is expensive. Wherever possible, reuse the returned * object. * * @param elem * the element * @return the computed style */ public ComputedStyle(Element elem) { computedStyle = getComputedStyle(elem); this.elem = elem; } private static native JavaScriptObject getComputedStyle(Element elem) /*-{ if(elem.nodeType != 1) { return {}; } if($wnd.document.defaultView && $wnd.document.defaultView.getComputedStyle) { return $wnd.document.defaultView.getComputedStyle(elem, null); } if(elem.currentStyle) { return elem.currentStyle; } }-*/; /** * * @param name * name of the CSS property in camelCase * @return the value of the property, normalized for across browsers (each * browser returns pixel values whenever possible). */ public final native String getProperty(String name) /*-{ var cs = this.@com.vaadin.terminal.gwt.client.ComputedStyle::computedStyle; var elem = this.@com.vaadin.terminal.gwt.client.ComputedStyle::elem; // Border values need to be checked separately. The width might have a // meaningful value even if the border style is "none". In that case the // value should be 0. if(name.indexOf("border") > -1 && name.indexOf("Width") > -1) { var borderStyleProp = name.substring(0,name.length-5) + "Style"; if(cs.getPropertyValue) var borderStyle = cs.getPropertyValue(borderStyleProp); else // IE var borderStyle = cs[borderStyleProp]; if(borderStyle == "none") return "0px"; } if(cs.getPropertyValue) { // Convert name to dashed format name = name.replace(/([A-Z])/g, "-$1").toLowerCase(); var ret = cs.getPropertyValue(name); } else { var ret = cs[name]; var style = elem.style; // From the awesome hack by Dean Edwards // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291 // If we're not dealing with a regular pixel number // but a number that has a weird ending, we need to convert it to pixels if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) { // Remember the original values var left = style.left, rsLeft = elem.runtimeStyle.left; // Put in the new values to get a computed value out elem.runtimeStyle.left = cs.left; style.left = ret || 0; ret = style.pixelLeft + "px"; // Revert the changed values style.left = left; elem.runtimeStyle.left = rsLeft; } } // Normalize margin values. This is not totally valid, but in most cases // it is what the user wants to know. if(name.indexOf("margin") > -1 && ret == "auto") { return "0px"; } // Some browsers return undefined width and height values as "auto", so // we need to retrieve those ourselves. if (name == "width" && ret == "auto") { ret = elem.clientWidth + "px"; } else if (name == "height" && ret == "auto") { ret = elem.clientHeight + "px"; } return ret; }-*/; public final int getIntProperty(String name) { Integer parsed = parseInt(getProperty(name)); if (parsed != null) { return parsed.intValue(); } return 0; } /** * Get current margin values from the DOM. The array order is the default * CSS order: top, right, bottom, left. */ public final int[] getMargin() { int[] margin = { 0, 0, 0, 0 }; margin[0] = getIntProperty("marginTop"); margin[1] = getIntProperty("marginRight"); margin[2] = getIntProperty("marginBottom"); margin[3] = getIntProperty("marginLeft"); return margin; } /** * Get current padding values from the DOM. The array order is the default * CSS order: top, right, bottom, left. */ public final int[] getPadding() { int[] padding = { 0, 0, 0, 0 }; padding[0] = getIntProperty("paddingTop"); padding[1] = getIntProperty("paddingRight"); padding[2] = getIntProperty("paddingBottom"); padding[3] = getIntProperty("paddingLeft"); return padding; } /** * Get current border values from the DOM. The array order is the default * CSS order: top, right, bottom, left. */ public final int[] getBorder() { int[] border = { 0, 0, 0, 0 }; border[0] = getIntProperty("borderTopWidth"); border[1] = getIntProperty("borderRightWidth"); border[2] = getIntProperty("borderBottomWidth"); border[3] = getIntProperty("borderLeftWidth"); return border; } /** * Takes a String value e.g. "12px" and parses that to int 12. * * @param String * a value starting with a number * @return int the value from the string before any non-numeric characters. * If the value cannot be parsed to a number, returns * null. */ public static native Integer parseInt(final String value) /*-{ var number = parseInt(value, 10); if (isNaN(number)) return null; else // $entry not needed as function is not exported return @java.lang.Integer::valueOf(I)(number); }-*/; }