📄 ui.draggable.js
字号:
/*
* jQuery UI Draggable
*
* Copyright (c) 2008 Paul Bakaus
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
* http://docs.jquery.com/UI/Draggables
*
* Depends:
* ui.core.js
*/
(function($) {
$.widget("ui.draggable", $.extend({}, $.ui.mouse, {
init: function() {
//Initialize needed constants
var o = this.options;
//Position the node
if (o.helper == 'original' && !(/(relative|absolute|fixed)/).test(this.element.css('position')))
this.element.css('position', 'relative');
this.element.addClass('ui-draggable');
(o.disabled && this.element.addClass('ui-draggable-disabled'));
this.mouseInit();
},
mouseStart: function(e) {
var o = this.options;
if (this.helper || o.disabled || $(e.target).is('.ui-resizable-handle')) return false;
var handle = !this.options.handle || !$(this.options.handle, this.element).length ? true : false;
$(this.options.handle, this.element).find("*").andSelf().each(function() {
if(this == e.target) handle = true;
});
if (!handle) return false;
if($.ui.ddmanager) $.ui.ddmanager.current = this;
//Create and append the visible helper
this.helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [e])) : (o.helper == 'clone' ? this.element.clone() : this.element);
if(!this.helper.parents('body').length) this.helper.appendTo((o.appendTo == 'parent' ? this.element[0].parentNode : o.appendTo));
if(this.helper[0] != this.element[0] && !(/(fixed|absolute)/).test(this.helper.css("position"))) this.helper.css("position", "absolute");
/*
* - Position generation -
* This block generates everything position related - it's the core of draggables.
*/
this.margins = { //Cache the margins
left: (parseInt(this.element.css("marginLeft"),10) || 0),
top: (parseInt(this.element.css("marginTop"),10) || 0)
};
this.cssPosition = this.helper.css("position"); //Store the helper's css position
this.offset = this.element.offset(); //The element's absolute position on the page
this.offset = { //Substract the margins from the element's absolute offset
top: this.offset.top - this.margins.top,
left: this.offset.left - this.margins.left
};
this.offset.click = { //Where the click happened, relative to the element
left: e.pageX - this.offset.left,
top: e.pageY - this.offset.top
};
this.offsetParent = this.helper.offsetParent(); var po = this.offsetParent.offset(); //Get the offsetParent and cache its position
if(this.offsetParent[0] == document.body && $.browser.mozilla) po = { top: 0, left: 0 }; //Ugly FF3 fix
this.offset.parent = { //Store its position plus border
top: po.top + (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
left: po.left + (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
};
var p = this.element.position(); //This is a relative to absolute position minus the actual position calculation - only used for relative positioned helpers
this.offset.relative = this.cssPosition == "relative" ? {
top: p.top - (parseInt(this.helper.css("top"),10) || 0) + this.offsetParent[0].scrollTop,
left: p.left - (parseInt(this.helper.css("left"),10) || 0) + this.offsetParent[0].scrollLeft
} : { top: 0, left: 0 };
this.originalPosition = this.generatePosition(e); //Generate the original position
this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };//Cache the helper size
if(o.cursorAt) {
if(o.cursorAt.left != undefined) this.offset.click.left = o.cursorAt.left + this.margins.left;
if(o.cursorAt.right != undefined) this.offset.click.left = this.helperProportions.width - o.cursorAt.right + this.margins.left;
if(o.cursorAt.top != undefined) this.offset.click.top = o.cursorAt.top + this.margins.top;
if(o.cursorAt.bottom != undefined) this.offset.click.top = this.helperProportions.height - o.cursorAt.bottom + this.margins.top;
}
/*
* - Position constraining -
* Here we prepare position constraining like grid and containment.
*/
if(o.containment) {
if(o.containment == 'parent') o.containment = this.helper[0].parentNode;
if(o.containment == 'document' || o.containment == 'window') this.containment = [
0 - this.offset.relative.left - this.offset.parent.left,
0 - this.offset.relative.top - this.offset.parent.top,
$(o.containment == 'document' ? document : window).width() - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.element.css("marginRight"),10) || 0),
($(o.containment == 'document' ? document : window).height() || document.body.parentNode.scrollHeight) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.element.css("marginBottom"),10) || 0)
];
if(!(/^(document|window|parent)$/).test(o.containment)) {
var ce = $(o.containment)[0];
var co = $(o.containment).offset();
this.containment = [
co.left + (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left,
co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top,
co.left+Math.max(ce.scrollWidth,ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.element.css("marginRight"),10) || 0),
co.top+Math.max(ce.scrollHeight,ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.element.css("marginBottom"),10) || 0)
];
}
}
//Call plugins and callbacks
this.propagate("start", e);
this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };//Recache the helper size
if ($.ui.ddmanager && !o.dropBehaviour) $.ui.ddmanager.prepareOffsets(this, e);
this.helper.addClass("ui-draggable-dragging");
this.mouseDrag(e); //Execute the drag once - this causes the helper not to be visible before getting its correct position
return true;
},
convertPositionTo: function(d, pos) {
if(!pos) pos = this.position;
var mod = d == "absolute" ? 1 : -1;
return {
top: (
pos.top // the calculated relative position
+ this.offset.relative.top * mod // Only for relative positioned nodes: Relative offset from element to offset parent
+ this.offset.parent.top * mod // The offsetParent's offset without borders (offset + border)
- (this.cssPosition == "fixed" || (this.cssPosition == "absolute" && this.offsetParent[0] == document.body) ? 0 : this.offsetParent[0].scrollTop) * mod // The offsetParent's scroll position, not if the element is fixed
+ (this.cssPosition == "fixed" ? $(document).scrollTop() : 0) * mod
+ this.margins.top * mod //Add the margin (you don't want the margin counting in intersection methods)
),
left: (
pos.left // the calculated relative position
+ this.offset.relative.left * mod // Only for relative positioned nodes: Relative offset from element to offset parent
+ this.offset.parent.left * mod // The offsetParent's offset without borders (offset + border)
- (this.cssPosition == "fixed" || (this.cssPosition == "absolute" && this.offsetParent[0] == document.body) ? 0 : this.offsetParent[0].scrollLeft) * mod // The offsetParent's scroll position, not if the element is fixed
+ (this.cssPosition == "fixed" ? $(document).scrollLeft() : 0) * mod
+ this.margins.left * mod //Add the margin (you don't want the margin counting in intersection methods)
)
};
},
generatePosition: function(e) {
var o = this.options;
var position = {
top: (
e.pageY // The absolute mouse position
- this.offset.click.top // Click offset (relative to the element)
- this.offset.relative.top // Only for relative positioned nodes: Relative offset from element to offset parent
- this.offset.parent.top // The offsetParent's offset without borders (offset + border)
+ (this.cssPosition == "fixed" || (this.cssPosition == "absolute" && this.offsetParent[0] == document.body) ? 0 : this.offsetParent[0].scrollTop) // The offsetParent's scroll position, not if the element is fixed
- (this.cssPosition == "fixed" ? $(document).scrollTop() : 0)
),
left: (
e.pageX // The absolute mouse position
- this.offset.click.left // Click offset (relative to the element)
- this.offset.relative.left // Only for relative positioned nodes: Relative offset from element to offset parent
- this.offset.parent.left // The offsetParent's offset without borders (offset + border)
+ (this.cssPosition == "fixed" || (this.cssPosition == "absolute" && this.offsetParent[0] == document.body) ? 0 : this.offsetParent[0].scrollLeft) // The offsetParent's scroll position, not if the element is fixed
- (this.cssPosition == "fixed" ? $(document).scrollLeft() : 0)
)
};
if(!this.originalPosition) return position; //If we are not dragging yet, we won't check for options
/*
* - Position constraining -
* Constrain the position to a mix of grid, containment.
*/
if(this.containment) {
if(position.left < this.containment[0]) position.left = this.containment[0];
if(position.top < this.containment[1]) position.top = this.containment[1];
if(position.left > this.containment[2]) position.left = this.containment[2];
if(position.top > this.containment[3]) position.top = this.containment[3];
}
if(o.grid) {
var top = this.originalPosition.top + Math.round((position.top - this.originalPosition.top) / o.grid[1]) * o.grid[1];
position.top = this.containment ? (!(top < this.containment[1] || top > this.containment[3]) ? top : (!(top < this.containment[1]) ? top - o.grid[1] : top + o.grid[1])) : top;
var left = this.originalPosition.left + Math.round((position.left - this.originalPosition.left) / o.grid[0]) * o.grid[0];
position.left = this.containment ? (!(left < this.containment[0] || left > this.containment[2]) ? left : (!(left < this.containment[0]) ? left - o.grid[0] : left + o.grid[0])) : left;
}
return position;
},
mouseDrag: function(e) {
//Compute the helpers position
this.position = this.generatePosition(e);
this.positionAbs = this.convertPositionTo("absolute");
//Call plugins and callbacks and use the resulting position if something is returned
this.position = this.propagate("drag", e) || this.position;
if(!this.options.axis || this.options.axis != "y") this.helper[0].style.left = this.position.left+'px';
if(!this.options.axis || this.options.axis != "x") this.helper[0].style.top = this.position.top+'px';
if($.ui.ddmanager) $.ui.ddmanager.drag(this, e);
return false;
},
mouseStop: function(e) {
//If we are using droppables, inform the manager about the drop
var dropped = false;
if ($.ui.ddmanager && !this.options.dropBehaviour)
var dropped = $.ui.ddmanager.drop(this, e);
if((this.options.revert == "invalid" && !dropped) || (this.options.revert == "valid" && dropped) || this.options.revert === true) {
var self = this;
$(this.helper).animate(this.originalPosition, parseInt(this.options.revert, 10) || 500, function() {
self.propagate("stop", e);
self.clear();
});
} else {
this.propagate("stop", e);
this.clear();
}
return false;
},
clear: function() {
this.helper.removeClass("ui-draggable-dragging");
if(this.options.helper != 'original' && !this.cancelHelperRemoval) this.helper.remove();
//if($.ui.ddmanager) $.ui.ddmanager.current = null;
this.helper = null;
this.cancelHelperRemoval = false;
},
// From now on bulk stuff - mainly helpers
plugins: {},
uiHash: function(e) {
return {
helper: this.helper,
position: this.position,
absolutePosition: this.positionAbs,
options: this.options
};
},
propagate: function(n,e) {
$.ui.plugin.call(this, n, [e, this.uiHash()]);
if(n == "drag") this.positionAbs = this.convertPositionTo("absolute"); //The absolute position has to be recalculated after plugins
return this.element.triggerHandler(n == "drag" ? n : "drag"+n, [e, this.uiHash()], this.options[n]);
},
destroy: function() {
if(!this.element.data('draggable')) return;
this.element.removeData("draggable").unbind(".draggable").removeClass('ui-draggable');
this.mouseDestroy();
}
}));
$.extend($.ui.draggable, {
defaults: {
appendTo: "parent",
axis: false,
cancel: ":input",
delay: 0,
distance: 1,
helper: "original"
}
});
$.ui.plugin.add("draggable", "cursor", {
start: function(e, ui) {
var t = $('body');
if (t.css("cursor")) ui.options._cursor = t.css("cursor");
t.css("cursor", ui.options.cursor);
},
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -