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+
+
+
+
+ The source code
+
+
+
+
+
+
+
/**
+ * @class Ext.core.Element
+ */
+Ext.core.Element.addMethods({
+ /**
+ * Gets the x,y coordinates specified by the anchor position on the element.
+ * @param {String} anchor (optional) The specified anchor position (defaults to "c"). See {@link #alignTo}
+ * for details on supported anchor positions.
+ * @param {Boolean} local (optional) True to get the local (element top/left-relative) anchor position instead
+ * of page coordinates
+ * @param {Object} size (optional) An object containing the size to use for calculating anchor position
+ * {width: (target width), height: (target height)} (defaults to the element's current size)
+ * @return {Array} [x, y] An array containing the element's x and y coordinates
+ */
+ getAnchorXY : function(anchor, local, s){
+ //Passing a different size is useful for pre-calculating anchors,
+ //especially for anchored animations that change the el size.
+ anchor = (anchor || "tl").toLowerCase();
+ s = s || {};
+
+ var me = this,
+ vp = me.dom == document.body || me.dom == document,
+ w = s.width || vp ? Ext.core.Element.getViewWidth() : me.getWidth(),
+ h = s.height || vp ? Ext.core.Element.getViewHeight() : me.getHeight(),
+ xy,
+ r = Math.round,
+ o = me.getXY(),
+ scroll = me.getScroll(),
+ extraX = vp ? scroll.left : !local ? o[0] : 0,
+ extraY = vp ? scroll.top : !local ? o[1] : 0,
+ hash = {
+ c : [r(w * 0.5), r(h * 0.5)],
+ t : [r(w * 0.5), 0],
+ l : [0, r(h * 0.5)],
+ r : [w, r(h * 0.5)],
+ b : [r(w * 0.5), h],
+ tl : [0, 0],
+ bl : [0, h],
+ br : [w, h],
+ tr : [w, 0]
+ };
+
+ xy = hash[anchor];
+ return [xy[0] + extraX, xy[1] + extraY];
+ },
+
+ /**
+ * Anchors an element to another element and realigns it when the window is resized.
+ * @param {Mixed} element The element to align to.
+ * @param {String} position The position to align to.
+ * @param {Array} offsets (optional) Offset the positioning by [x, y]
+ * @param {Boolean/Object} animate (optional) True for the default animation or a standard Element animation config object
+ * @param {Boolean/Number} monitorScroll (optional) True to monitor body scroll and reposition. If this parameter
+ * is a number, it is used as the buffer delay (defaults to 50ms).
+ * @param {Function} callback The function to call after the animation finishes
+ * @return {Ext.core.Element} this
+ */
+ anchorTo : function(el, alignment, offsets, animate, monitorScroll, callback){
+ var me = this,
+ dom = me.dom,
+ scroll = !Ext.isEmpty(monitorScroll),
+ action = function(){
+ Ext.fly(dom).alignTo(el, alignment, offsets, animate);
+ Ext.callback(callback, Ext.fly(dom));
+ },
+ anchor = this.getAnchor();
+
+ // previous listener anchor, remove it
+ this.removeAnchor();
+ Ext.apply(anchor, {
+ fn: action,
+ scroll: scroll
+ });
+
+ Ext.EventManager.onWindowResize(action, null);
+
+ if(scroll){
+ Ext.EventManager.on(window, 'scroll', action, null,
+ {buffer: !isNaN(monitorScroll) ? monitorScroll : 50});
+ }
+ action.call(me); // align immediately
+ return me;
+ },
+
+ /**
+ * Remove any anchor to this element. See {@link #anchorTo}.
+ * @return {Ext.core.Element} this
+ */
+ removeAnchor : function(){
+ var me = this,
+ anchor = this.getAnchor();
+
+ if(anchor && anchor.fn){
+ Ext.EventManager.removeResizeListener(anchor.fn);
+ if(anchor.scroll){
+ Ext.EventManager.un(window, 'scroll', anchor.fn);
+ }
+ delete anchor.fn;
+ }
+ return me;
+ },
+
+ // private
+ getAnchor : function(){
+ var data = Ext.core.Element.data,
+ dom = this.dom;
+ if (!dom) {
+ return;
+ }
+ var anchor = data(dom, '_anchor');
+
+ if(!anchor){
+ anchor = data(dom, '_anchor', {});
+ }
+ return anchor;
+ },
+
+ getAlignVector: function(el, spec, offset) {
+ var me = this,
+ side = {t:"top", l:"left", r:"right", b: "bottom"},
+ thisRegion = me.getRegion(),
+ elRegion;
+
+ el = Ext.get(el);
+ if(!el || !el.dom){
+ //<debug>
+ Ext.Error.raise({
+ sourceClass: 'Ext.core.Element',
+ sourceMethod: 'getAlignVector',
+ msg: 'Attempted to align an element that doesn\'t exist'
+ });
+ //</debug>
+ }
+
+ elRegion = el.getRegion();
+ },
+
+ /**
+ * Gets the x,y coordinates to align this element with another element. See {@link #alignTo} for more info on the
+ * supported position values.
+ * @param {Mixed} element The element to align to.
+ * @param {String} position (optional, defaults to "tl-bl?") The position to align to.
+ * @param {Array} offsets (optional) Offset the positioning by [x, y]
+ * @return {Array} [x, y]
+ */
+ getAlignToXY : function(el, p, o){
+ el = Ext.get(el);
+
+ if(!el || !el.dom){
+ //<debug>
+ Ext.Error.raise({
+ sourceClass: 'Ext.core.Element',
+ sourceMethod: 'getAlignToXY',
+ msg: 'Attempted to align an element that doesn\'t exist'
+ });
+ //</debug>
+ }
+
+ o = o || [0,0];
+ p = (!p || p == "?" ? "tl-bl?" : (!(/-/).test(p) && p !== "" ? "tl-" + p : p || "tl-bl")).toLowerCase();
+
+ var me = this,
+ d = me.dom,
+ a1,
+ a2,
+ x,
+ y,
+ //constrain the aligned el to viewport if necessary
+ w,
+ h,
+ r,
+ dw = Ext.core.Element.getViewWidth() -10, // 10px of margin for ie
+ dh = Ext.core.Element.getViewHeight()-10, // 10px of margin for ie
+ p1y,
+ p1x,
+ p2y,
+ p2x,
+ swapY,
+ swapX,
+ doc = document,
+ docElement = doc.documentElement,
+ docBody = doc.body,
+ scrollX = (docElement.scrollLeft || docBody.scrollLeft || 0)+5,
+ scrollY = (docElement.scrollTop || docBody.scrollTop || 0)+5,
+ c = false, //constrain to viewport
+ p1 = "",
+ p2 = "",
+ m = p.match(/^([a-z]+)-([a-z]+)(\?)?$/);
+
+ if(!m){
+ //<debug>
+ Ext.Error.raise({
+ sourceClass: 'Ext.core.Element',
+ sourceMethod: 'getAlignToXY',
+ el: el,
+ position: p,
+ offset: o,
+ msg: 'Attemmpted to align an element with an invalid position: "' + p + '"'
+ });
+ //</debug>
+ }
+
+ p1 = m[1];
+ p2 = m[2];
+ c = !!m[3];
+
+ //Subtract the aligned el's internal xy from the target's offset xy
+ //plus custom offset to get the aligned el's new offset xy
+ a1 = me.getAnchorXY(p1, true);
+ a2 = el.getAnchorXY(p2, false);
+
+ x = a2[0] - a1[0] + o[0];
+ y = a2[1] - a1[1] + o[1];
+
+ if(c){
+ w = me.getWidth();
+ h = me.getHeight();
+ r = el.getRegion();
+ //If we are at a viewport boundary and the aligned el is anchored on a target border that is
+ //perpendicular to the vp border, allow the aligned el to slide on that border,
+ //otherwise swap the aligned el to the opposite border of the target.
+ p1y = p1.charAt(0);
+ p1x = p1.charAt(p1.length-1);
+ p2y = p2.charAt(0);
+ p2x = p2.charAt(p2.length-1);
+ swapY = ((p1y=="t" && p2y=="b") || (p1y=="b" && p2y=="t"));
+ swapX = ((p1x=="r" && p2x=="l") || (p1x=="l" && p2x=="r"));
+
+
+ if (x + w > dw + scrollX) {
+ x = swapX ? r.left-w : dw+scrollX-w;
+ }
+ if (x < scrollX) {
+ x = swapX ? r.right : scrollX;
+ }
+ if (y + h > dh + scrollY) {
+ y = swapY ? r.top-h : dh+scrollY-h;
+ }
+ if (y < scrollY){
+ y = swapY ? r.bottom : scrollY;
+ }
+ }
+ return [x,y];
+ },
+
+ /**
+ * Aligns this element with another element relative to the specified anchor points. If the other element is the
+ * document it aligns it to the viewport.
+ * The position parameter is optional, and can be specified in any one of the following formats:
+ * <ul>
+ * <li><b>Blank</b>: Defaults to aligning the element's top-left corner to the target's bottom-left corner ("tl-bl").</li>
+ * <li><b>One anchor (deprecated)</b>: The passed anchor position is used as the target element's anchor point.
+ * The element being aligned will position its top-left corner (tl) to that point. <i>This method has been
+ * deprecated in favor of the newer two anchor syntax below</i>.</li>
+ * <li><b>Two anchors</b>: If two values from the table below are passed separated by a dash, the first value is used as the
+ * element's anchor point, and the second value is used as the target's anchor point.</li>
+ * </ul>
+ * In addition to the anchor points, the position parameter also supports the "?" character. If "?" is passed at the end of
+ * the position string, the element will attempt to align as specified, but the position will be adjusted to constrain to
+ * the viewport if necessary. Note that the element being aligned might be swapped to align to a different position than
+ * that specified in order to enforce the viewport constraints.
+ * Following are all of the supported anchor positions:
+<pre>
+Value Description
+----- -----------------------------
+tl The top left corner (default)
+t The center of the top edge
+tr The top right corner
+l The center of the left edge
+c In the center of the element
+r The center of the right edge
+bl The bottom left corner
+b The center of the bottom edge
+br The bottom right corner
+</pre>
+Example Usage:
+<pre><code>
+// align el to other-el using the default positioning ("tl-bl", non-constrained)
+el.alignTo("other-el");
+
+// align the top left corner of el with the top right corner of other-el (constrained to viewport)
+el.alignTo("other-el", "tr?");
+
+// align the bottom right corner of el with the center left edge of other-el
+el.alignTo("other-el", "br-l?");
+
+// align the center of el with the bottom left corner of other-el and
+// adjust the x position by -6 pixels (and the y position by 0)
+el.alignTo("other-el", "c-bl", [-6, 0]);
+</code></pre>
+ * @param {Mixed} element The element to align to.
+ * @param {String} position (optional, defaults to "tl-bl?") The position to align to.
+ * @param {Array} offsets (optional) Offset the positioning by [x, y]
+ * @param {Boolean/Object} animate (optional) true for the default animation or a standard Element animation config object
+ * @return {Ext.core.Element} this
+ */
+ alignTo : function(element, position, offsets, animate){
+ var me = this;
+ return me.setXY(me.getAlignToXY(element, position, offsets),
+ me.anim && !!animate ? me.anim(animate) : false);
+ },
+
+ // private ==> used outside of core
+ adjustForConstraints : function(xy, parent) {
+ var vector = this.getConstrainVector(parent, xy);
+ if (vector) {
+ xy[0] += vector[0];
+ xy[1] += vector[1];
+ }
+ return xy;
+ },
+
+ /**
+ * <p>Returns the <code>[X, Y]</code> vector by which this element must be translated to make a best attempt
+ * to constrain within the passed constraint. Returns <code>false</code> is this element does not need to be moved.</p>
+ * <p>Priority is given to constraining the top and left within the constraint.</p>
+ * <p>The constraint may either be an existing element into which this element is to be constrained, or
+ * an {@link Ext.util.Region Region} into which this element is to be constrained.</p>
+ * @param constrainTo {Mixed} The Element or {@link Ext.util.Region Region} into which this element is to be constrained.
+ * @param proposedPosition {Array} A proposed <code>[X, Y]</code> position to test for validity and to produce a vector for instead
+ * of using this Element's current position;
+ * @returns {Array} <b>If</b> this element <i>needs</i> to be translated, an <code>[X, Y]</code>
+ * vector by which this element must be translated. Otherwise, <code>false</code>.
+ */
+ getConstrainVector: function(constrainTo, proposedPosition) {
+ if (!(constrainTo instanceof Ext.util.Region)) {
+ constrainTo = Ext.get(constrainTo).getViewRegion();
+ }
+ var thisRegion = this.getRegion(),
+ vector = [0, 0],
+ shadowSize = this.shadow && this.shadow.offset,
+ overflowed = false;
+
+ // Shift this region to occupy the proposed position
+ if (proposedPosition) {
+ thisRegion.translateBy(proposedPosition[0] - thisRegion.x, proposedPosition[1] - thisRegion.y);
+ }
+
+ // Reduce the constrain region to allow for shadow
+ // TODO: Rewrite the Shadow class. When that's done, get the extra for each side from the Shadow.
+ if (shadowSize) {
+ constrainTo.adjust(0, -shadowSize, -shadowSize, shadowSize);
+ }
+
+ // Constrain the X coordinate by however much this Element overflows
+ if (thisRegion.right > constrainTo.right) {
+ overflowed = true;
+ vector[0] = (constrainTo.right - thisRegion.right); // overflowed the right
+ }
+ if (thisRegion.left + vector[0] < constrainTo.left) {
+ overflowed = true;
+ vector[0] = (constrainTo.left - thisRegion.left); // overflowed the left
+ }
+
+ // Constrain the Y coordinate by however much this Element overflows
+ if (thisRegion.bottom > constrainTo.bottom) {
+ overflowed = true;
+ vector[1] = (constrainTo.bottom - thisRegion.bottom); // overflowed the bottom
+ }
+ if (thisRegion.top + vector[1] < constrainTo.top) {
+ overflowed = true;
+ vector[1] = (constrainTo.top - thisRegion.top); // overflowed the top
+ }
+ return overflowed ? vector : false;
+ },
+
+ /**
+ * Calculates the x, y to center this element on the screen
+ * @return {Array} The x, y values [x, y]
+ */
+ getCenterXY : function(){
+ return this.getAlignToXY(document, 'c-c');
+ },
+
+ /**
+ * Centers the Element in either the viewport, or another Element.
+ * @param {Mixed} centerIn (optional) The element in which to center the element.
+ */
+ center : function(centerIn){
+ return this.alignTo(centerIn || document, 'c-c');
+ }
+});
+