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MDL-47494 ddimageortext: NOBUG added key handlers for arrow keys, space key and escape key to select

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drags for drop zones.
This commit is contained in:
Jamie Pratt
2011-08-22 22:23:35 +07:00
parent dbf87f16be
commit 5fd925aaa9
1 changed files with 129 additions and 15 deletions
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question/type/ddimageortext/yui/dd/dd.js
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+129 -15
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@@ -68,6 +68,9 @@ YUI.add('moodle-qtype_ddimagetoimage-dd', function(Y) {
drag_image : function(draginstanceno) {
return dragimagesarea.one('img.draginstance' + draginstanceno);
},
drag_images_in_group : function(groupno) {
return dragimagesarea.all('img.drag.group' + groupno);
},
drag_image_homes : function() {
return dragimagesarea.all('img.draghome');
},
@@ -258,6 +261,80 @@ YUI.add('moodle-qtype_ddimagetoimage-dd', function(Y) {
}
}, this);
this.reposition_drags_for_question();
if (!this.get('readonly')) {
this.doc.drop_zones().set('tabIndex', 0);
this.doc.drop_zones().each(
function(v){
v.on('dragchange', this.drop_zone_key_press, this);
}
, this);
}
},
drop_zone_key_press : function (e) {
switch (e.direction) {
case 'next' :
this.place_next_drag_in(e.target);
break;
case 'previous' :
this.place_previous_drag_in(e.target);
break;
case 'remove' :
this.remove_drag_from_drop(e.target);
break;
}
e.preventDefault();
this.reposition_drags_for_question();
},
place_next_drag_in : function (drop) {
this.search_for_unplaced_drop_choice(drop, 1);
},
place_previous_drag_in : function (drop) {
this.search_for_unplaced_drop_choice(drop, -1);
},
search_for_unplaced_drop_choice : function (drop, direction) {
var next;
var current = this.current_drag_in_drop(drop);
if ('' === current) {
if (direction == 1) {
next = 1;
} else {
next = 1;
var groupno = drop.getData('group');
this.doc.drag_images_in_group(groupno).each(function(drag) {
next = Math.max(next, drag.getData('choice'));
}, this);
}
} else {
next = + current + direction;
}
var drag;
do {
if (this.get_choices_for_drop(next, drop).size() === 0){
this.remove_drag_from_drop(drop);
return;
} else {
drag = this.get_unplaced_choice_for_drop(next, drop);
}
next = next + direction;
} while (drag === null);
this.place_drag_in_drop(drag, drop);
},
current_drag_in_drop : function (drop) {
var inputid = drop.getData('inputid');
var inputnode = Y.one('input#'+inputid);
return inputnode.get('value');
},
remove_drag_from_drop : function (drop) {
this.place_drag_in_drop(null, drop);
},
place_drag_in_drop : function (drag, drop) {
var inputid = drop.getData('inputid');
var inputnode = Y.one('input#'+inputid);
if (drag !== null) {
inputnode.set('value', drag.getData('choice'));
} else {
inputnode.set('value', '');
}
},
reposition_drags_for_question : function() {
this.doc.drag_images().removeClass('placed');
@@ -273,18 +350,7 @@ YUI.add('moodle-qtype_ddimagetoimage-dd', function(Y) {
var input = this.doc.top_node().one(inputcss);
var choice = input.get('value');
if (choice !== "") {
var group = dropzone.getData('group');
var dragimage = null;
var dragimages = this.doc.top_node()
.all('div.dragitemgroup'+group+' img.choice'+choice+'.drag');
dragimages.some(function (d) {
if (!d.hasClass('placed')) {
dragimage = d;
return true;
} else {
return false;
}
});
var dragimage = this.get_unplaced_choice_for_drop(choice, dropzone);
if (dragimage !== null) {
dragimage.setXY(dropzone.getXY());
dragimage.addClass('placed');
@@ -304,6 +370,28 @@ YUI.add('moodle-qtype_ddimagetoimage-dd', function(Y) {
}
}, this);
},
get_choices_for_drop : function(choice, drop) {
var group = drop.getData('group');
var dragimage = null;
var dragimages = this.doc.top_node()
.all('div.dragitemgroup'+group+' img.choice'+choice+'.drag');
return dragimages;
},
get_unplaced_choice_for_drop : function(choice, drop) {
var dragimages = this.get_choices_for_drop(choice, drop);
if (dragimages.some(function (d) {
if (!d.hasClass('placed')) {
dragimage = d;
return true;
} else {
return false;
}
})) {
return dragimage;
} else {
return null;
}
},
init_drops : function () {
var dropareas = this.doc.top_node().one('div.dropzones');
var groupnodes = {};
@@ -330,15 +418,41 @@ YUI.add('moodle-qtype_ddimagetoimage-dd', function(Y) {
var drag = e.drag.get('node');
var drop = e.drop.get('node');
if (+drop.getData('group') === drag.getData('group')){
var inputid = drop.getData('inputid');
var inputnode = Y.one('input#'+inputid);
inputnode.set('value', drag.getData('choice'));
this.place_drag_in_drop(drag, drop);
}
}, this);
};
}
}, {NAME : DDIMAGETOIMAGEQUESTIONNAME, ATTRS : {}});
Y.Event.define('dragchange', {
// Webkit and IE repeat keydown when you hold down arrow keys.
// Opera links keypress to page scroll; others keydown.
// Firefox prevents page scroll via preventDefault() on either
// keydown or keypress.
_event: (Y.UA.webkit || Y.UA.ie) ? 'keydown' : 'keypress',
_keys: {
'32': 'next',
'37': 'previous',
'38': 'previous',
'39': 'next',
'40': 'next',
'27': 'remove'
},
_keyHandler: function (e, notifier) {
if (this._keys[e.keyCode]) {
e.direction = this._keys[e.keyCode];
notifier.fire(e);
}
},
on: function (node, sub, notifier) {
sub._detacher = node.on(this._event, this._keyHandler,
this, notifier);
}
});
M.qtype_ddimagetoimage.init_question = function(config) {
return new DDIMAGETOIMAGE_QUESTION(config);
}