282 lines
7.2 KiB
JavaScript
282 lines
7.2 KiB
JavaScript
/*
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* jQuery Infinite Drag
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* Version 0.3
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* Copyright (c) 2010 Ian Li (http://ianli.com)
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* Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) license.
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*
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* Requires:
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* jQuery http://jquery.com
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*
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* Reference:
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* http://ianli.com/infinitedrag/ for Usage
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*
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* Versions:
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* 0.3
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* - Added move
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* 0.2
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* - Fixed problem with IE 8.0
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* 0.1
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* - Initial implementation
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*/
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(function($) {
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/**
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* Function to create InfiniteDrag object.
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*/
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$.infinitedrag = function(draggable, draggable_options, tile_options) {
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return new InfiniteDrag(draggable, draggable_options, tile_options);
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};
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$.infinitedrag.VERSION = 0.3;
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/**
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* The InfiniteDrag object.
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*/
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var InfiniteDrag = function(draggable, draggable_options, tile_options) {
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// Use self to reduce confusion about this.
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var self = this;
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var $draggable = $(draggable);
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var $viewport = $draggable.parent();
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$draggable.css({
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position: "relative",
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cursor: "move"
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});
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// Draggable options
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var _do = (draggable_options) ? draggable_options : {};
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// Tile options (DEFAULT)
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var _to = {
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class_name: "_tile",
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width: 100,
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height: 100,
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start_col: 0,
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start_row: 0,
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range_col: [-1000000, 1000000],
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range_row: [-1000000, 1000000],
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oncreate: function($element, i, j) {
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$element.text("");
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// $element.css("background","url(librerias/notas/img/corcho.jpg)");
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$element.css("background","url(./librerias/notas/img/corcho.jpg)");
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// $element.class("holam");
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}
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};
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// Override tile options.
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for (var i in tile_options) {
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if (tile_options[i] !== undefined) {
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_to[i] = tile_options[i];
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}
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}
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// Override tile options based on draggable options.
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if (_do.axis == "x") {
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_to.range_row = [_to.start_row, _to.start_row];
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} else if (_do.axis == "y") {
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_to.range_col = [_to.start_col, _to.start_col];
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}
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// Creates the tile at (i, j).
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function create_tile(i, j) {
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if (i < _to.range_col[0] || _to.range_col[1] < i) {
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return;
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} else if (j < _to.range_row[0] || _to.range_row[1] < j) {
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return;
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}
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grid[i][j] = true;
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var x = i * _to.width;
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var y = j * _to.height;
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var $e = $draggable.append('<div></div>');
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var $new_tile = $e.children(":last");
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$new_tile.attr({
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"class": _to.class_name,
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col: i,
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row: j
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}).css({
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position: "absolute",
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left: x,
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top: y,
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width: _to.width,
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height: _to.height
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});
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_to.oncreate($new_tile, i, j);
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};
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// Updates the containment box wherein the draggable can be dragged.
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var update_containment = function() {
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// Update viewport info.
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viewport_width = $viewport.width(),
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viewport_height = $viewport.height(),
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viewport_cols = Math.ceil(viewport_width / _to.width),
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viewport_rows = Math.ceil(viewport_height / _to.height);
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// Create containment box.
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var half_width = _to.width / 2,
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half_height = _to.height / 2,
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viewport_offset = $viewport.offset(),
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viewport_draggable_width = viewport_width - _to.width,
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viewport_draggable_height = viewport_height - _to.height;
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var containment = [
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(-_to.range_col[1] * _to.width) + viewport_offset.left + viewport_draggable_width,
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(-_to.range_row[1] * _to.height) + viewport_offset.top + viewport_draggable_height,
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(-_to.range_col[0] * _to.width) + viewport_offset.left,
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(-_to.range_row[0] * _to.height) + viewport_offset.top
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];
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$draggable.draggable("option", "containment", containment);
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};
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var update_tiles = function() {
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var $this = $draggable;
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var $parent = $this.parent();
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// Problem with .position() in Chrome/WebKit:
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// var pos = $(this).position();
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// So, we compute it ourselves.
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var pos = {
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left: $this.offset().left - $parent.offset().left,
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top: $this.offset().top - $parent.offset().top
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}
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var visible_left_col = Math.ceil(-pos.left / _to.width) - 1,
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visible_top_row = Math.ceil(-pos.top / _to.height) - 1;
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for (var i = visible_left_col; i <= visible_left_col + viewport_cols; i++) {
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for (var j = visible_top_row; j <= visible_top_row + viewport_rows; j++) {
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if (grid[i] === undefined) {
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grid[i] = {};
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} else if (grid[i][j] === undefined) {
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create_tile(i, j);
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}
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}
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}
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};
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// Public Methods
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//-----------------
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self.draggable = function() {
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return $draggable;
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};
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self.disabled = function(value) {
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if (value === undefined) {
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return $draggable;
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}
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$draggable.draggable("option", "disabled", value);
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$draggable.css({ cursor: (value) ? "default" : "move" });
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};
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self.move = function(col, row) {
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var offset = $draggable.offset();
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var move = {
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left: col * _to.width,
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top: row * _to.height
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};
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var new_offset = {
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left: offset.left - move.left,
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top: offset.top - move.top
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};
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if (_do.axis == "x") {
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new_offset.top = offset.top;
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} else if (_do.axis == "y") {
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new_offset.left = offset.left;
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}
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var containment = $draggable.draggable("option", "containment");
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if (containment[0] <= new_offset.left && new_offset.left <= containment[2]
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&& containment[1] <= new_offset.top && new_offset.top <= containment[3]) {
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$draggable.offset(new_offset);
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update_tiles();
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} else {
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// Don't let the tile go beyond the right edge.
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if (new_offset.left < containment[0]) {
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new_offset.left = containment[0];
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}
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// Don't let the tile go beyond the left edge.
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if (new_offset.left > containment[2]) {
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new_offset.left = containment[2];
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}
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$draggable.offset(new_offset);
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update_tiles();
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}
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};
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self.center = function(col, row) {
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var x = _to.width * col,
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y = _to.height * row,
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half_width = _to.width / 2,
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half_height = _to.height / 2,
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half_vw_width = $viewport.width() / 2,
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half_vw_height = $viewport.height() / 2,
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offset = $draggable.offset();
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var new_offset = {
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left: -x - (half_width - half_vw_width),
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top: -y - (half_height - half_vw_height)
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};
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if (_do.axis == "x") {
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new_offset.top = offset.top;
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} else if (_do.axis == "y") {
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new_offset.left = offset.left;
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}
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$draggable.offset(new_offset);
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update_tiles();
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};
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// Setup
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//--------
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var viewport_width = $viewport.width(),
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viewport_height = $viewport.height(),
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viewport_cols = Math.ceil(viewport_width / _to.width),
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viewport_rows = Math.ceil(viewport_height / _to.height);
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$draggable.offset({
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left: $viewport.offset().left - (_to.start_col * _to.width),
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top: $viewport.offset().top - (_to.start_row * _to.height)
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});
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var grid = {};
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for (var i = _to.start_col, m = _to.start_col + viewport_cols; i < m && (_to.range_col[0] <= i && i <= _to.range_col[1]); i++) {
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grid[i] = {}
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for (var j = _to.start_row, n = _to.start_row + viewport_rows; j < n && (_to.range_row[0] <= j && j <= _to.range_row[1]); j++) {
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create_tile(i, j);
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}
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}
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// Handle resize of window.
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$(window).resize(function() {
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// HACK:
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// Update the containment when the window is resized
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// because the containment boundaries depend on the offset of the viewport.
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update_containment();
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});
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// The drag event handler.
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_do.drag = function(e, ui) {
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update_tiles();
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};
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$draggable.draggable(_do);
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update_containment();
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};
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})(jQuery);
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