shuffle answers in exercise order + fix answer numbering

[fnpeditor.git] / src / editor / modules / documentCanvas / canvas / keyboard.js

diff --git a/src/editor/modules/documentCanvas/canvas/keyboard.js b/src/editor/modules/documentCanvas/canvas/keyboard.js
index cd12a02..e43ea89 100644 (file)
--- a/src/editor/modules/documentCanvas/canvas/keyboard.js
+++ b/src/editor/modules/documentCanvas/canvas/keyboard.js
@@ -1,10 +1,10 @@
 define([
 define([

-'modules/documentCanvas/canvas/documentElement',
+'libs/jquery',

 'modules/documentCanvas/canvas/utils'
 'modules/documentCanvas/canvas/utils'

-], function(documentElement, utils) {
+], function($, utils) {

     
 'use strict';
     
 'use strict';

-
+/* globals gettext */

 
 var KEYS = {
     ENTER: 13,
 
 var KEYS = {
     ENTER: 13,


@@ -17,232 +17,408 @@ var KEYS = {
     X: 88
 };
 
     X: 88
 };
 

-var handleKey = function(event, canvas) {
-    handlers.some(function(handler) {
-        if(handles(handler, event) && handler[event.type]) {
-            handler[event.type](event, canvas);
-            return true;
-        }
-    });
-};
-
-var handles = function(handler, event) {
-    if(handler.key === event.which) {
-        return true;
+var scroll = function(place, textElement) {
+    var rect = textElement.getBoundingClientRect(),
+        scroll = $('#rng-module-documentCanvas-contentWrapper'),
+        border = rect.bottom - (place === 'top' ? rect.height : 0) - scroll.offset().top + scroll[0].scrollTop,
+        visible = scroll[0].scrollTop + {top: 0, bottom: scroll.height()}[place],
+        padding = 16,
+        toScroll = 0;
+    
+    if(place === 'top' && (border - padding < visible)) {
+        toScroll =  border - visible - padding;
+    } else if(place === 'bottom' && (border + padding > visible))  {
+        toScroll = border - visible + padding;

     }
     }

-    if(handler.keys && handler.keys.indexOf(event.which) !== -1) {
-        return true;
+    if(toScroll) {
+        scroll[0].scrollTop = scroll[0].scrollTop + toScroll;

     }
     }

-    return false;
+    return toScroll;

 };
 
 };
 

-var handlers = [];
+var getLastRectAbove = function(node, y) {
+    var rects = node.getClientRects(),
+        idx = 0,
+        rect, toret;
+    while((rect = rects[idx])) {
+        if(rect.bottom < y) {
+            toret = rect;
+        } else {
+            break;
+        }
+        idx++;
+    }
+    return toret;
+};

 
 

+var getFirstRectBelow = function(node, y) {
+    var rects = node.getClientRects(),
+        idx = 0,
+        rect, toret;
+    while((rect = rects[idx])) {
+        if(rect.top > y) {
+            toret = rect;
+            break;
+        }
+        idx++;
+    }
+    return toret;
+};

 
 

-handlers.push({key: KEYS.ENTER,
-    keydown: function(event, canvas) {
-        event.preventDefault();
-        var cursor = canvas.getCursor(),
-            position = cursor.getPosition(),
-            element = position.element,
-            added;
+var handleKeyEvent = function(e, s) {
+    keyEventHandlers.some(function(handler) {
+        if(handler.applies(e, s)) {
+            handler.run(e, s);
+            return true;
+        }
+    });
+};
+// todo: whileRemoveWholetext
+var keyEventHandlers = [
+    {
+        applies: function(e, s) {
+            return e.ctrlKey &&
+                e.key === KEYS.X &&
+                s.type === 'textSelection' &&
+                s.startsAtBeginning() &&
+                s.endsAtEnd();
+        },
+        run: function(e,s) {
+            void(s);
+            e.preventDefault();
+        }
+    },
+    {
+        applies: function(e, s) {
+            return e.key === KEYS.ARROW_UP && s.type === 'caret';
+        },
+        run: function(e, s) {
+            /* globals window */
+            var caretRect = window.getSelection().getRangeAt(0).getClientRects()[0],
+                frameRects = s.element.dom[0].getClientRects(),
+                caretTop = caretRect.bottom - caretRect.height,
+                position, target,rect, scrolled;

 
 

-        if(Object.keys(cursor.getPosition()).length === 0) {
-            var currentElement = canvas.getCurrentNodeElement();
-            if(currentElement) {
-                canvas.wlxmlDocument.startTransaction();
-                added = currentElement.data('wlxmlNode').after({
-                    tagName: currentElement.getWlxmlTag() || 'div',
-                    attrs: {'class': currentElement.getWlxmlClass() || 'p'}
+            
+            if((frameRects[0].bottom === caretRect.bottom) || (caretRect.left < frameRects[0].left)) {
+                e.preventDefault();
+                s.canvas.rootWrapper.find('[document-text-element]').each(function() {
+                    var test = getLastRectAbove(this, caretTop);
+                    if(test) {
+                        target = this;
+                        rect = test;
+                    } else {
+                        return false;
+                    }

                 });
                 });

-                added.append({text:''});
-                canvas.wlxmlDocument.endTransaction();
-                canvas.setCurrentElement(utils.findCanvasElement(added), {caretTo: 'start'});
+                if(target) {
+                    scrolled = scroll('top', target);
+                    position = utils.caretPositionFromPoint(caretRect.left, rect.bottom - 1 - scrolled);
+                    s.canvas.setCurrentElement(s.canvas.getDocumentElement(position.textNode), {caretTo: position.offset});
+                }
+            }
+            if(target) {
+                scrolled = scroll('top', target);
+                var left = caretRect.left;
+                if(left > rect.left + rect.width) {
+                    left = rect.left + rect.width;
+                } else if(left < rect.left ) {
+                    left = rect.left;
+                }
+                position = utils.caretPositionFromPoint(left, rect.bottom - 1 - scrolled);
+                s.canvas.setCurrentElement(s.canvas.getDocumentElement(position.textNode), {caretTo: position.offset});

             }
             }

-            return;

         }
         }

+    },
+    {
+        applies: function(e, s) {
+            return e.key === KEYS.ARROW_DOWN && s.type === 'caret';
+        },
+        run: function(e, s) {
+            /* globals window */
+            var caretRect = window.getSelection().getRangeAt(0).getClientRects()[0],
+                frameRects = s.element.dom[0].getClientRects(),
+                lastRect = frameRects[frameRects.length-1],
+                position, target,rect, scrolled;

 
 

-        if(!cursor.isSelecting()) {
-            if(event.ctrlKey) {
-                if(element instanceof documentElement.DocumentTextElement) {
-                    element = element.parent();
+            if(lastRect.bottom === caretRect.bottom || (caretRect.left > lastRect.left + lastRect.width)) {
+                e.preventDefault();
+                s.canvas.rootWrapper.find('[document-text-element]').each(function() {
+                    var test = getFirstRectBelow(this, caretRect.bottom);
+                    if(test) {
+                        target = this;
+                        rect = test;
+                        return false;
+                    }
+                });
+                if(target) {
+                    scrolled = scroll('bottom', target);
+                    position = utils.caretPositionFromPoint(caretRect.left, rect.top +1 - scrolled);
+                    s.canvas.setCurrentElement(s.canvas.getDocumentElement(position.textNode), {caretTo: position.offset});

                 }
                 }

-
-                canvas.wlxmlDocument.startTransaction();
-                added = element.data('wlxmlNode').after(
-                    {tagName: element.getWlxmlTag() || 'div', attrs: {'class': element.getWlxmlClass() || 'p'}}
-                );
-                added.append({text: ''});
-                canvas.wlxmlDocument.endTransaction();
-                canvas.setCurrentElement(utils.findCanvasElement(added), {caretTo: 'start'});
-
-            } else {
-
-                if(!(element.parent().parent())) {
-                    return false; // top level element is unsplittable
+            }
+            if(target) {
+                scrolled = scroll('bottom', target);
+                var left = caretRect.left;
+                if(left > rect.left + rect.width) {
+                    left = rect.left + rect.width;
+                } else if(left < rect.left ) {
+                    left = rect.left;

                 }
                 }

+                position = utils.caretPositionFromPoint(left, rect.top +1 - scrolled);
+                s.canvas.setCurrentElement(s.canvas.getDocumentElement(position.textNode), {caretTo: position.offset});
+            }
+        }
+    },
+    {
+        applies: function(e, s) {
+            return e.key === KEYS.ARROW_LEFT && s.type === 'caret';
+        },
+        run: function(e, s) {
+            /* globals window */
+            var prev;

 
 

-                //var nodes = position.element.data('wlxmlNode').split({offset: position.offset}),
-                // var nodes = position.element.data('wlxmlNode').transform('split', {offset: position.offset}),
-                //     newEmpty,
-                //     goto,
-                //     gotoOptions;
-
-                // if(position.offsetAtBeginning)
-                //     newEmpty = nodes.first;
-                // else if(position.offsetAtEnd)
-                //     newEmpty = nodes.second;
-                
-                // if(newEmpty) {
-                //     //goto = newEmpty.append({text: ''});
-                //     gotoOptions = {};
-                // } else {
-                //     goto = nodes.second;
-                //     gotoOptions = {caretTo: 'start'};
-                // }
-
-                var result = position.element.data('wlxmlNode').breakContent({offset: position.offset}),
-                    goto, gotoOptions;
-                if(result.emptyText) {
-                    goto = result.emptyText;
-                    gotoOptions = {};
-                } else {
-                    goto = result.second;
-                    gotoOptions = {caretTo: 'start'};
+            if(s.offset === 0) {
+                e.preventDefault();
+                prev = s.canvas.getPreviousTextElement(s.element);
+                if(prev) {
+                    scroll('top', prev.dom[0]);
+                    s.canvas.setCurrentElement(s.canvas.getDocumentElement(prev.dom.contents()[0]), {caretTo: 'end'});

                 }
                 }

-
-                canvas.setCurrentElement(utils.findCanvasElement(goto), gotoOptions);

             }
         }
             }
         }

-    }
-});
-
-handlers.push({keys: [KEYS.ARROW_UP, KEYS.ARROW_DOWN, KEYS.ARROW_LEFT, KEYS.ARROW_RIGHT],
-    keydown: function(event, canvas) {
-        var position = canvas.getCursor().getPosition(),
-            element = position.element;
-        if(element && (element instanceof documentElement.DocumentTextElement) && element.isEmpty()) {
-            var direction, caretTo;
-            if(event.which === KEYS.ARROW_LEFT  || event.which === KEYS.ARROW_UP) {
+    },
+    {
+        applies: function(e, s) {
+            return e.key === KEYS.ARROW_RIGHT && s.type === 'caret';
+        },
+        run: function(e, s) {
+            /* globals window */
+            var next;
+            if(s.isAtEnd()) {
+                e.preventDefault();
+                next = s.canvas.getNextTextElement(s.element);
+                if(next) {
+                    scroll('bottom', next.dom[0]);
+                    s.canvas.setCurrentElement(s.canvas.getDocumentElement(next.dom.contents()[0]), {caretTo: 0});
+                }
+            } else {
+                var secondToLast = (s.offset === s.element.wlxmlNode.getText().length -1);
+                if(secondToLast) {
+                    // Only Flying Spaghetti Monster knows why this is need for FF (for versions at least 26 to 31)
+                    e.preventDefault();
+                    s.canvas.setCurrentElement(s.element, {caretTo: 'end'});
+                }
+            }
+        }
+    },
+    {
+        applies: function(e, s) {
+            return s.type === 'caret' &&
+                s.element.wlxmlNode.parent().is({tagName: 'span'}) &&
+                s.element.wlxmlNode.getText().length === 1 &&
+                s.offset === 1 &&
+                (e.key === KEYS.BACKSPACE);
+        },
+        run: function(e, s) {
+            var params = {},
+                prevTextNode = s.element.canvas.getPreviousTextElement(s.element).wlxmlNode;
+            e.preventDefault();
+            s.element.wlxmlNode.parent().detach(params);
+            s.canvas.setCurrentElement(
+                (params.ret && params.ret.mergedTo) || prevTextNode,
+                {caretTo: params.ret ? params.ret.previousLen : (prevTextNode ? prevTextNode.getText().length : 0)});
+        }
+    },
+    {
+        applies: function(e, s) {
+            return s.type === 'caret' && (
+                (s.isAtBeginning() && e.key === KEYS.BACKSPACE) ||
+                (s.isAtEnd() && e.key === KEYS.DELETE)
+            );
+        },
+        run: function(e,s) {
+            var direction, caretTo, cursorAtOperationEdge, goto, element;
+
+            if(e.key === KEYS.BACKSPACE) {

                 direction = 'above';
                 caretTo = 'end';
                 direction = 'above';
                 caretTo = 'end';

-            } else {
+                cursorAtOperationEdge = s.isAtBeginning();
+                element = s.element;
+            }
+            else {

                 direction = 'below';
                 caretTo = 'start';
                 direction = 'below';
                 caretTo = 'start';

+                cursorAtOperationEdge = s.isAtEnd();
+                element = cursorAtOperationEdge && s.canvas.getNearestTextElement(direction, s.element);

             }
             }

-            var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
-            canvas.setCurrentElement(el, {caretTo: caretTo});
-        }
-    },
-    keyup: function(event, canvas) {
-        var element = canvas.getCursor().getPosition().element,
-            caretTo = false;
-        if(!element) {
-            // Chrome hack
-
-            var moves = [{direction: 'above', caretTo: 'end'}, {direction: 'below', caretTo: 'start'}];
-            if(event.which === KEYS.ARROW_RIGHT  || event.which === KEYS.ARROW_DOWN) {
-                moves.reverse();
+
+            if(!cursorAtOperationEdge || !element) {
+                return;

             }
             }

-            moves.some(function(move) {
-                /* globals window */
-                var targetNode = utils.nearestInDocumentOrder('[document-text-element]:visible', move.direction, window.getSelection().focusNode);
-                if(targetNode) {
-                    element = canvas.getDocumentElement(targetNode);
-                    caretTo = move.caretTo;
-                    return true; // break
-                }
-            });
-        }
-        if(element) {
-            canvas.setCurrentElement(element, {caretTo: caretTo});
-        }
-    }
-});

 
 
 
 

-var selectsWholeTextElement = function(cursor) {
-    if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd) {
-        return true;
-    }
-    return false;
-};
+            var parent = element.wlxmlNode.parent();
+            if(element.wlxmlNode.getIndex() === 0 && parent.isContextRoot() && (!parent.is('item') || parent.getIndex() === 0)) {
+                // Don't even try to do anything at the edge of a context root, except for non-first items
+                // - this is a temporary solution until key events handling get refactored into something more sane.
+                return;
+            }

 
 

-handlers.push({key: KEYS.X,
-    keydown: function(event, canvas) {
-        if(event.ctrlKey && selectsWholeTextElement(canvas.getCursor())) {
-            event.preventDefault();
-        }
-    }
-});
-
-handlers.push({keys: [KEYS.BACKSPACE, KEYS.DELETE],
-    keydown: function(event, canvas) {
-        var cursor = canvas.getCursor(),
-            position = canvas.getCursor().getPosition(),
-            element = position.element,
-            node = element.data('wlxmlNode');
-
-        if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
-            event.preventDefault();
-            return;
-        }
-            
-        var cursorAtOperationEdge = position.offsetAtBeginning;
-        if(event.which === KEYS.DELETE) {
-            cursorAtOperationEdge = position.offsetAtEnd;
-        }
+            e.preventDefault();

 
 

-        var willDeleteWholeText = function() {
-            return element.getText().length === 1 || selectsWholeTextElement(cursor);
-        };
+            s.canvas.wlxmlDocument.transaction(function() {
+                if(element.wlxmlNode.getIndex() === 0) {
+                    goto = element.wlxmlNode.parent().moveUp();
+                } else {
+                    goto = element.wlxmlNode.moveUp();
+                }
+                if(goto) {
+                   s.canvas.setCurrentElement(goto.node, {caretTo: goto.offset});
+                }
+            }, {
+                metadata: {
+                    description: gettext('Remove text')
+                }
+            });
+        }
+    },

 
 

-        canvas.wlxmlDocument.startTransaction();
-        
-        if(willDeleteWholeText()) {
-            event.preventDefault();
-            node.setText('');
+    {
+        applies: function(e,s) {
+            return s.type === 'caret' && s.element.getText().length === 1 && (e.key === KEYS.BACKSPACE || e.key === KEYS.DELETE);
+        },
+        run: function(e,s) {
+            e.preventDefault();
+            s.element.wlxmlNode.setText('');
+            s.canvas.setCurrentElement(s.element, {caretTo: 0});

         }
         }

-        else if(element.isEmpty()) {
+    },

 
 

+    {
+        applies: function(e, s) {
+            return s.type === 'textSelection' && (e.key === KEYS.BACKSPACE || e.key === KEYS.DELETE);
+        },
+        run: function(e, s) {

             var direction = 'above',
             var direction = 'above',

-                caretTo = 'end';
-                
-            if(event.which === KEYS.DELETE) {
+                caretTo = 'end',
+                goto;
+
+            if(e.key === KEYS.DELETE) {

                 direction = 'below';
                 caretTo = 'start';
             }
 
                 direction = 'below';
                 caretTo = 'start';
             }
 

-            event.preventDefault();
+            e.preventDefault();

 
 

-            var parent = element.parent(),
-                grandParent = parent ? parent.parent() : null,
-                goto;
-            if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
-                if(grandParent && grandParent.children().length === 1) {
-                    goto = grandParent.data('wlxmlNode').append({text: ''});
+            if(s.startsAtBeginning && s.endsAtEnd && s.startElement.sameNode(s.endElement)) {
+                goto = s.startElement;
+                caretTo = s.startOffset;
+            } else if(direction === 'above') {
+                if(s.startsAtBeginning()) {
+                    goto = s.canvas.getNearestTextElement('above', s.startElement);
+                    caretTo = 'end';

                 } else {
                 } else {

-                    goto = element.getNearestTextElement(direction);
+                    goto = s.startElement;
+                    caretTo = s.startOffset;

                 }
                 }

-                parent.data('wlxmlNode').detach();

             } else {
             } else {

-                goto = element.getNearestTextElement(direction);
-                element.data('wlxmlNode').detach();
+                if(s.endsAtEnd()) {
+                    goto = s.canvas.getNearestTextElement('below', s.startElement);
+                    caretTo = 'start';
+                } else {
+                    goto = s.endElement;
+                    caretTo = 0;
+                }

             }
             }

-            canvas.setCurrentElement(goto, {caretTo: caretTo});
-            canvas.publisher('contentChanged');
+
+            var doc = s.canvas.wlxmlDocument;
+            doc.transaction(function() {
+                
+                doc.deleteText({
+                    from: {
+                        node: s.startElement.wlxmlNode,
+                        offset: s.startOffset
+                    },
+                    to: {
+                        node: s.endElement.wlxmlNode,
+                        offset: s.endOffset
+                    }
+                });
+
+            }, {
+                success: function() {
+                    if(goto) {
+                        s.canvas.setCurrentElement(goto, {caretTo: caretTo});
+                    }
+                }
+            });
+

         }
         }

-        else if(cursorAtOperationEdge) {
-            // todo
-            event.preventDefault();
+    },
+    {
+        applies: function(e, s) {
+            var parent = s.element && s.element.wlxmlNode.parent(),
+                parentIsItem = parent && parent.is('item'),
+                itemIsOnList = parent && parent.parent() && parent.parent().is('list');
+            return s.type === 'caret' && e.key === KEYS.ENTER && s.element.isEmpty() && parentIsItem && itemIsOnList;
+        },
+        run: function(e, s) {
+            var item = s.element.wlxmlNode.parent(),
+                list = item.parent();
+            e.preventDefault();
+            s.canvas.wlxmlDocument.transaction(function() {
+                var p = list.after({tagName: 'div', attrs: {'class': 'p'}});
+                p.append({text: ''});
+                item.detach();
+                return p;
+            }, {
+                success: function(p) {
+                    s.canvas.setCurrentElement(p);
+                }
+            });

         }
         }

-        canvas.wlxmlDocument.endTransaction();
+    },
+    {
+        applies: function(e, s) {
+            return s.type === 'caret' && e.key === KEYS.ENTER && !s.element.parent().isRootElement();
+        },
+        run: function(e, s) {
+            var parent = s.element.parent(),
+                children = parent.children(),
+                result, goto, gotoOptions;
+            void(e);
+            e.preventDefault();
+
+            if(children.length === 1 && s.element.isEmpty()) {
+                return;
+            }
+
+            s.canvas.wlxmlDocument.transaction(function() {
+                result = s.element.wlxmlNode.breakContent({offset: s.offset});
+            }, {
+                metadata: {
+                    description: gettext('Splitting text'),
+                    fragment: s.toDocumentFragment()
+                }
+            });
+
+            if(result.emptyText) {
+                goto = result.emptyText;
+                gotoOptions = {};
+            } else {
+                goto = result.second;
+                gotoOptions = {caretTo: 'start'};
+            }

 
 

+            s.canvas.setCurrentElement(utils.getElementForNode(goto), gotoOptions);
+        }

     }
     }

-});
+];

 
 return {
 
 return {

-    handleKey: handleKey
+    handleKeyEvent: handleKeyEvent,
+    KEYS: KEYS

 };
 
 });
\ No newline at end of file
 };
 
 });
\ No newline at end of file