296 lines
11 KiB
JavaScript
296 lines
11 KiB
JavaScript
/*
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DragResize v1.0
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(c) 2005-2006 Angus Turnbull, TwinHelix Designs http://www.twinhelix.com
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Licensed under the CC-GNU LGPL, version 2.1 or later:
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http://creativecommons.org/licenses/LGPL/2.1/
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This is distributed WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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// Common API code.
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if (typeof addEvent != 'function') {
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var removeEvent = function(o, t, f, l) {
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var d = 'removeEventListener';
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if (o[d] && !l) {
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return o[d](t, f, false);
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}
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if (o._evts && o._evts[t] && f._i) {
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delete o._evts[t][f._i];
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}
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};
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var addEvent = function(o, t, f, l) {
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var d = 'addEventListener', n = 'on' + t, rO = o, rT = t, rF = f, rL = l;
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if (o[d] && !l) {
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return o[d](t, f, false);
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}
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if (!o._evts) {
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o._evts = {};
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}
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if (!o._evts[t]) {
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o._evts[t] = o[n] ? { b: o[n] } : {};
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o[n] = new Function('e',
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'var r = true, o = this, a = o._evts["' + t + '"], i; for (i in a) {' +
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'o._f = a[i]; r = o._f(e||window.event) != false && r; o._f = null;' +
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'} return r'
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);
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if (t != 'unload') {
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addEvent(window, 'unload', function() {
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removeEvent(rO, rT, rF, rL);
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});
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}
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}
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if (!f._i) {
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f._i = addEvent._i++;
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}
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o._evts[t][f._i] = f;
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};
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addEvent._i = 1;
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}
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function cancelEvent(e, c) {
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e.returnValue = false;
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if (e.preventDefault) {
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e.preventDefault();
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}
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if (c) {
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e.cancelBubble = true;
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if (e.stopPropagation) {
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e.stopPropagation();
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}
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}
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}
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// *** DRAG/RESIZE CODE ***
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function DragResize(myName, config) {
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var props = {
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myName: myName, // Name of the object.
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enabled: true, // Global toggle of drag/resize.
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handles: ['tl', 'tm', 'tr',
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'ml', 'mr', 'bl', 'bm', 'br'], // Array of drag handles: top/mid/bot/right.
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isElement: null, // Function ref to test for an element.
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element: null, // The currently selected element.
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handle: null, // Active handle reference of the element.
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minWidth: 10, minHeight: 10, // Minimum pixel size of elements.
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minLeft: 0, maxLeft: 9999, // Bounding box area, in pixels.
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minTop: 0, maxTop: 9999,
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zIndex: 1, // The highest Z-Index yet allocated.
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mouseX: 0, mouseY: 0, // Current mouse position, recorded live.
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lastMouseX: 0, lastMouseY: 0, // Last processed mouse positions.
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mOffX: 0, mOffY: 0, // A known offset between position & mouse.
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elmX: 0, elmY: 0, // Element position.
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elmW: 0, elmH: 0, // Element size.
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allowBlur: true, // Whether to allow automatic blur onclick.
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ondragfocus: null, // Event handler functions.
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ondragstart: null,
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ondragmove: null,
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ondragend: null,
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ondragblur: null
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};
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for (var p in props) {
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this[p] = (typeof config[p] == 'undefined') ? props[p] : config[p];
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}
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};
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DragResize.prototype.apply = function(node) {
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// Adds object event handlers to the specified DOM node.
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var obj = this;
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addEvent(node, 'mousedown', function(e) { obj.mouseDown(e) } );
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addEvent(node, 'mousemove', function(e) { obj.mouseMove(e) } );
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addEvent(node, 'mouseup', function(e) { obj.mouseUp(e) } );
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};
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DragResize.prototype.select = function(newElement) {
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with (this) {
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// Selects an element for dragging.
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if (!document.getElementById || !enabled) return;
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// Activate and record our new dragging element.
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if (newElement && (newElement != element) && enabled) {
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element = newElement;
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// Elevate it
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element.style.zIndex = ++zIndex;
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// Record element attributes for mouseMove().
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elmX = parseInt(element.style.left);
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elmY = parseInt(element.style.top);
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elmW = element.offsetWidth;
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elmH = element.offsetHeight;
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if (ondragfocus) this.ondragfocus();
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}
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}
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};
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DragResize.prototype.deselect = function(delHandles) {
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with (this) {
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// Immediately stops dragging an element. If 'delHandles' is true, this
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// remove the handles from the element and clears the element flag,
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// completely resetting the .
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if (!document.getElementById || !enabled) return;
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if (delHandles) {
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if (ondragblur) this.ondragblur();
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element = null;
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}
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handle = null;
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mOffX = 0;
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mOffY = 0;
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}
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};
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DragResize.prototype.mouseDown = function(e) {
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with (this) {
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// Suitable elements are selected for drag/resize on mousedown.
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// We also initialise the resize boxes, and drag parameters like mouse position etc.
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if (!document.getElementById || !enabled) return true;
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var elm = e.target || e.srcElement,
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newElement = null,
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newHandle = null,
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hRE = new RegExp(myName + '-([trmbl]{2})', '');
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while (elm) {
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// Loop up the DOM looking for matching elements. Remember one if found.
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if (elm.className) {
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if (!newHandle && (hRE.test(elm.className))) newHandle = elm;
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if (isElement(elm)) { newElement = elm; break }
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}
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elm = elm.parentNode;
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}
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// If this isn't on the last dragged element, call deselect(),
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// which will hide its handles and clear element.
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if (element && (element != newElement) && allowBlur) deselect(true);
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// If we have a new matching element, call select().
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if (newElement && (!element || (newElement == element))) {
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// Stop mouse selections if we're dragging a handle.
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if (newHandle) cancelEvent(e);
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select(newElement, newHandle);
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handle = newHandle;
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if (handle && ondragstart) this.ondragstart(hRE.test(handle.className));
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}
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}
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};
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DragResize.prototype.mouseMove = function(e) { with (this) {
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// This continually offsets the dragged element by the difference between the
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// last recorded mouse position (mouseX/Y) and the current mouse position.
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if (!document.getElementById || !enabled) return true;
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// We always record the current mouse position.
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mouseX = e.pageX || e.clientX + document.documentElement.scrollLeft;
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mouseY = e.pageY || e.clientY + document.documentElement.scrollTop;
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// Record the relative mouse movement, in case we're dragging.
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// Add any previously stored & ignored offset to the calculations.
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var diffX = mouseX - lastMouseX + mOffX;
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var diffY = mouseY - lastMouseY + mOffY;
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mOffX = mOffY = 0;
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// Update last processed mouse positions.
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lastMouseX = mouseX;
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lastMouseY = mouseY;
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// That's all we do if we're not dragging anything.
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if (!handle) return true;
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// If included in the script, run the resize handle drag routine.
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// Let it create an object representing the drag offsets.
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var isResize = false;
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if (this.resizeHandleDrag && this.resizeHandleDrag(diffX, diffY)) {
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isResize = true;
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} else {
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// If the resize drag handler isn't set or returns fase (to indicate the drag was
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// not on a resize handle), we must be dragging the whole element, so move that.
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// Bounds check left-right...
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var dX = diffX, dY = diffY;
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if (elmX + dX < minLeft) mOffX = (dX - (diffX = minLeft - elmX));
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else if (elmX + elmW + dX > maxLeft) mOffX = (dX - (diffX = maxLeft - elmX - elmW));
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// ...and up-down.
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if (elmY + dY < minTop) mOffY = (dY - (diffY = minTop - elmY));
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else if (elmY + elmH + dY > maxTop) mOffY = (dY - (diffY = maxTop - elmY - elmH));
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elmX += diffX;
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elmY += diffY;
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}
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// Assign new info back to the element, with minimum dimensions.
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with (element.style) {
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left = elmX + 'px';
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width = elmW + 'px';
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top = elmY + 'px';
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height = elmH + 'px';
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}
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// Evil, dirty, hackish Opera select-as-you-drag fix.
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if (window.opera && document.documentElement) {
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var oDF = document.getElementById('op-drag-fix');
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if (!oDF) {
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var oDF = document.createElement('input');
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oDF.id = 'op-drag-fix';
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oDF.style.display = 'none';
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document.body.appendChild(oDF);
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}
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oDF.focus();
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}
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if (ondragmove) this.ondragmove(isResize);
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// Stop a normal drag event.
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cancelEvent(e);
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}};
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DragResize.prototype.mouseUp = function(e) { with (this) {
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// On mouseup, stop dragging, but don't reset handler visibility.
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if (!document.getElementById || !enabled) return;
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var hRE = new RegExp(myName + '-([trmbl]{2})', '');
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if (handle && ondragend) this.ondragend(hRE.test(handle.className));
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deselect(false);
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}};
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DragResize.prototype.resizeHandleDrag = function(diffX, diffY) { with (this) {
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// Passed the mouse movement amounts. This function checks to see whether the
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// drag is from a resize handle created above; if so, it changes the stored
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// elm* dimensions and mOffX/Y.
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var hClass = handle && handle.className &&
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handle.className.match(new RegExp(myName + '-([tmblr]{2})')) ? RegExp.$1 : '';
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// If the hClass is one of the resize handles, resize one or two dimensions.
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// Bounds checking is the hard bit -- basically for each edge, check that the
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// element doesn't go under minimum size, and doesn't go beyond its boundary.
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var dY = diffY, dX = diffX, processed = false;
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if (hClass.indexOf('t') >= 0) {
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rs = 1;
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if (elmH - dY < minHeight) mOffY = (dY - (diffY = elmH - minHeight));
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else if (elmY + dY < minTop) mOffY = (dY - (diffY = minTop - elmY));
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elmY += diffY;
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elmH -= diffY;
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processed = true;
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}
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if (hClass.indexOf('b') >= 0) {
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rs = 1;
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if (elmH + dY < minHeight) mOffY = (dY - (diffY = minHeight - elmH));
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else if (elmY + elmH + dY > maxTop) mOffY = (dY - (diffY = maxTop - elmY - elmH));
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elmH += diffY;
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processed = true;
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}
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if (hClass.indexOf('l') >= 0) {
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rs = 1;
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if (elmW - dX < minWidth) mOffX = (dX - (diffX = elmW - minWidth));
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else if (elmX + dX < minLeft) mOffX = (dX - (diffX = minLeft - elmX));
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elmX += diffX;
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elmW -= diffX;
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processed = true;
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}
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if (hClass.indexOf('r') >= 0) {
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rs = 1;
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if (elmW + dX < minWidth) mOffX = (dX - (diffX = minWidth - elmW));
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else if (elmX + elmW + dX > maxLeft) mOffX = (dX - (diffX = maxLeft - elmX - elmW));
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elmW += diffX;
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processed = true;
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}
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return processed;
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}};
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