mediawiki-extensions-Visual.../modules/es/views/es.SurfaceView.js

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/**
* Creates an es.SurfaceView object.
*
* @class
* @constructor
* @param {jQuery} $container DOM Container to render surface into
* @param {es.SurfaceModel} model Surface model to view
*/
es.SurfaceView = function( $container, model ) {
// Inheritance
es.EventEmitter.call( this );
// References for use in closures
var _this = this,
$document = $( document ),
$window = $( window );
// Properties
this.model = model;
this.currentSelection = new es.Range();
this.documentView = new es.DocumentView( this.model.getDocument(), this );
this.$ = $container
.addClass( 'es-surfaceView' )
.append( this.documentView.$ );
this.$input = $( '<textarea class="es-surfaceView-textarea" />' )
.prependTo( this.$ );
this.$cursor = $( '<div class="es-surfaceView-cursor"></div>' )
.appendTo( this.$ );
// Interaction states
/*
* There are three different selection modes available for mouse. Selection of:
* 1 - chars
* 2 - words
* 3 - nodes (e.g. paragraph, listitem)
*
* In case of 2 and 3 selectedRange stores the range of original selection caused by double
* or triple mousedowns.
*/
this.mouse = {
selectingMode: null,
selectedRange: null
};
this.cursor = {
interval: null,
initialLeft: null,
initialBias: false
};
this.keyboard = {
selecting: false,
cursorAnchor: null,
keydownTimeout: null,
keys: { shift: false }
};
this.dimensions = {
width: this.$.width(),
height: $window.height(),
scrollTop: $window.scrollTop(),
// XXX: This is a dirty hack!
toolbarTop: $( '#es-toolbar' ).offset().top,
toolbarHeight: $( '#es-toolbar' ).height()
};
// Events
this.model.on( 'select', function( selection ) {
// Keep a copy of the current selection on hand
_this.currentSelection = selection.clone();
// Respond to selection changes
if ( selection.from !== selection.to ) {
_this.hideCursor();
} else {
_this.showCursor();
}
_this.documentView.drawSelection( selection );
} );
this.model.getDocument().on( 'update', function() {
_this.emit( 'update' );
} );
this.$.mousedown( function(e) {
return _this.onMouseDown( e );
} );
this.$input.on( {
'focus': function() {
// Make sure we aren't double-binding
$document.off( '.es-surfaceView' );
// Bind mouse and key events to the document to ensure we don't miss anything
$document.on( {
'mousemove.es-surfaceView': function(e) {
return _this.onMouseMove( e );
},
'mouseup.es-surfaceView': function(e) {
return _this.onMouseUp( e );
},
'keydown.es-surfaceView': function( e ) {
return _this.onKeyDown( e );
},
'keyup.es-surfaceView': function( e ) {
return _this.onKeyUp( e );
}
} );
},
'blur': function( e ) {
// Release our event handlers when not focused
$document.off( '.es-surfaceView' );
_this.hideCursor();
}
} );
$window.resize( function() {
// Re-render when resizing horizontally
// TODO: Instead of re-rendering on every single 'resize' event wait till user is done with
// resizing - can be implemented with setTimeout
_this.hideCursor();
_this.dimensions.height = $window.height();
var width = _this.$.width();
if ( _this.dimensions.width !== width ) {
_this.dimensions.width = width;
_this.documentView.renderContent();
}
} );
$window.scroll( function() {
// FIXME: Is this code in the right place?
_this.dimensions.scrollTop = $window.scrollTop();
if ( _this.dimensions.scrollTop >= _this.dimensions.toolbarTop ) {
$( '#es-toolbar' ).addClass( 'float' );
$( '#es-panes' ).css( 'padding-top', _this.dimensions.toolbarHeight );
} else {
$( '#es-toolbar' ).removeClass( 'float' );
$( '#es-panes' ).css( 'padding-top', 0 );
}
} );
// Configuration
this.mac = navigator.userAgent.match(/mac/i) ? true : false; // (yes it's evil, for keys only!)
// Initialization
this.$input.focus();
this.documentView.renderContent();
};
/* Methods */
es.SurfaceView.prototype.onMouseDown = function( e ) {
// Only for left mouse button
if ( e.button === 0 ) {
var selection = this.currentSelection.clone(),
offset = this.documentView.getOffsetFromEvent( e );
// Single click
if ( e.originalEvent.detail === 1 ) {
// @see {es.SurfaceView.prototype.onMouseMove}
this.mouse.selectingMode = 1;
if ( this.keyboard.keys.shift && offset !== selection.from ) {
// Extend current or create new selection
selection.to = offset;
} else {
if ( selection.to !== selection.from ) {
// Clear the selection if there was any
this.documentView.clearSelection();
}
selection.from = selection.to = offset;
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var position = es.Position.newFromEventPagePosition( e ),
nodeView = this.documentView.getNodeFromOffset( offset, false );
this.cursor.initialBias = position.left > nodeView.contentView.$.offset().left;
}
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}
// Double click
else if ( e.originalEvent.detail === 2 ) {
// @see {es.SurfaceView.prototype.onMouseMove}
this.mouse.selectingMode = 2;
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var wordRange = this.model.getDocument().getWordBoundaries( offset );
if( wordRange ) {
selection = wordRange;
this.mouse.selectedRange = selection.clone();
}
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}
// Triple click
else if ( e.originalEvent.detail >= 3 ) {
// @see {es.SurfaceView.prototype.onMouseMove}
this.mouse.selectingMode = 3;
var node = this.documentView.getNodeFromOffset( offset ),
nodeOffset = this.documentView.getOffsetFromNode( node, false );
selection.from = this.model.getDocument().getRelativeContentOffset( nodeOffset, 1 );
selection.to = this.model.getDocument().getRelativeContentOffset(
nodeOffset + node.getElementLength(), -1
);
this.mouse.selectedRange = selection.clone();
}
// Reset the initial left position
this.cursor.initialLeft = null;
// Apply new selection
this.model.select( selection );
}
// If the inut isn't already focused, focus it and select it's contents
if ( !this.$input.is( ':focus' ) ) {
this.$input.focus().select();
}
return false;
};
es.SurfaceView.prototype.onMouseMove = function( e ) {
// Only with the left mouse button while in selecting mode
if ( e.button === 0 && this.mouse.selectingMode ) {
var selection = this.currentSelection.clone(),
offset = this.documentView.getOffsetFromEvent( e );
// Character selection
if ( this.mouse.selectingMode === 1 ) {
selection.to = offset;
}
// Word selection
else if ( this.mouse.selectingMode === 2 ) {
var wordRange = this.model.getDocument().getWordBoundaries( offset );
if ( wordRange ) {
if ( wordRange.to <= this.mouse.selectedRange.from ) {
selection.from = wordRange.from;
selection.to = this.mouse.selectedRange.to;
} else {
selection.from = this.mouse.selectedRange.from;
selection.to = wordRange.to;
}
}
}
// Node selection
else if ( this.mouse.selectingMode === 3 ) {
// @see {es.SurfaceView.prototype.onMouseMove}
this.mouse.selectingMode = 3;
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var nodeRange = this.documentView.getRangeFromNode(
this.documentView.getNodeFromOffset( offset )
);
if ( nodeRange.to <= this.mouse.selectedRange.from ) {
selection.from = this.model.getDocument().getRelativeContentOffset(
nodeRange.from, 1
);
selection.to = this.mouse.selectedRange.to;
} else {
selection.from = this.mouse.selectedRange.from;
selection.to = this.model.getDocument().getRelativeContentOffset(
nodeRange.to, -1
);
}
}
// Apply new selection
this.model.select( selection, true );
}
};
es.SurfaceView.prototype.onMouseUp = function( e ) {
if ( e.button === 0 ) { // left mouse button
this.mouse.selectingMode = this.mouse.selectedRange = null;
this.model.select( this.currentSelection );
}
};
es.SurfaceView.prototype.onKeyDown = function( e ) {
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var _this = this;
function handleInsert() {
if ( _this.keyboard.keydownTimeout ) {
clearTimeout( _this.keyboard.keydownTimeout );
}
_this.keyboard.keydownTimeout = setTimeout( function () {
_this.insertFromInput();
}, 10 );
}
switch ( e.keyCode ) {
// Shift
case 16:
this.keyboard.keys.shift = true;
this.keyboard.selecting = true;
break;
// Home
case 36:
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this.moveCursor( 'left', 'line' );
break;
// End
case 35:
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this.moveCursor( 'right', 'line' );
break;
// Left arrow
case 37:
if ( !this.mac ) {
if ( e.ctrlKey ) {
this.moveCursor( 'left', 'word' );
} else {
this.moveCursor( 'left', 'char' );
}
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} else {
if ( e.metaKey || e.ctrlKey ) {
this.moveCursor( 'left', 'line' );
} else if ( e.altKey ) {
this.moveCursor( 'left', 'word' );
} else {
this.moveCursor( 'left', 'char' );
}
}
break;
// Up arrow
case 38:
if ( !this.mac ) {
if ( e.ctrlKey ) {
this.moveCursor( 'up', 'unit' );
} else {
this.moveCursor( 'up', 'char' );
}
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} else {
if ( e.altKey ) {
this.moveCursor( 'up', 'unit' );
} else {
this.moveCursor( 'up', 'char' );
}
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}
break;
// Right arrow
case 39:
if ( !this.mac ) {
if ( e.ctrlKey ) {
this.moveCursor( 'right', 'word' );
} else {
this.moveCursor( 'right', 'char' );
}
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} else {
if ( e.metaKey || e.ctrlKey ) {
this.moveCursor( 'right', 'line' );
} else if ( e.altKey ) {
this.moveCursor( 'right', 'word' );
} else {
this.moveCursor( 'right', 'char' );
}
}
break;
// Down arrow
case 40:
if ( !this.mac ) {
if ( e.ctrlKey ) {
this.moveCursor( 'down', 'unit' );
} else {
this.moveCursor( 'down', 'char' );
}
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} else {
if ( e.altKey ) {
this.moveCursor( 'down', 'unit' );
} else {
this.moveCursor( 'down', 'char' );
}
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}
break;
// Backspace
case 8:
this.handleDelete( true );
break;
// Delete
case 46:
this.handleDelete();
break;
// Enter
case 13:
this.handleEnter();
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e.preventDefault();
break;
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// U (soft undo/soft redo)
case 85:
if ( e.metaKey || e.ctrlKey ) {
if ( this.keyboard.keys.shift ) {
this.model.redo( 1 );
} else {
this.model.undo( 1 );
}
return false;
}
handleInsert();
break;
// Z (undo/redo)
case 90:
if ( e.metaKey || e.ctrlKey ) {
if ( this.keyboard.keys.shift ) {
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this.model.redo( 1, true );
} else {
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this.model.undo( 1, true );
}
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return false;
}
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handleInsert();
break;
// Insert content (maybe)
default:
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handleInsert();
break;
}
return true;
};
es.SurfaceView.prototype.onKeyUp = function( e ) {
switch ( e.keyCode ) {
case 16: // Shift
this.keyboard.keys.shift = false;
if ( this.keyboard.selecting ) {
this.keyboard.selecting = false;
}
break;
default:
break;
}
return true;
};
es.SurfaceView.prototype.handleDelete = function( backspace ) {
var selection = this.currentSelection.clone(),
sourceOffset,
targetOffset,
sourceSplitableNode,
targetSplitableNode,
tx;
if ( selection.from === selection.to ) {
if ( backspace ) {
sourceOffset = selection.to;
targetOffset = this.model.getDocument().getRelativeContentOffset(
sourceOffset,
-1
);
} else {
sourceOffset = this.model.getDocument().getRelativeContentOffset(
selection.to,
1
);
targetOffset = selection.to;
}
var sourceNode = this.documentView.getNodeFromOffset( sourceOffset, false ),
targetNode = this.documentView.getNodeFromOffset( targetOffset, false );
if ( sourceNode.model.getElementType() === targetNode.model.getElementType() ) {
sourceSplitableNode = es.DocumentViewNode.getSplitableNode( sourceNode );
targetSplitableNode = es.DocumentViewNode.getSplitableNode( targetNode );
}
selection.from = selection.to = targetOffset;
this.model.select( selection );
if ( sourceNode === targetNode ||
( typeof sourceSplitableNode !== 'undefined' &&
sourceSplitableNode.getParent() === targetSplitableNode.getParent() ) ) {
tx = this.model.getDocument().prepareRemoval(
new es.Range( targetOffset, sourceOffset )
);
this.model.transact( tx );
} else {
tx = this.model.getDocument().prepareInsertion(
targetOffset, sourceNode.model.getContent()
);
this.model.transact( tx );
var nodeToDelete = sourceNode;
es.DocumentNode.traverseUpstream( nodeToDelete, function( node ) {
if ( node.getParent().children.length === 1 ) {
nodeToDelete = node.getParent();
} else {
return false;
}
} );
var range = new es.Range();
range.from = this.documentView.getOffsetFromNode( nodeToDelete, false );
range.to = range.from + nodeToDelete.getElementLength();
tx = this.model.getDocument().prepareRemoval( range );
this.model.transact( tx );
}
} else {
// selection removal
tx = this.model.getDocument().prepareRemoval( selection );
this.model.transact( tx );
this.documentView.clearSelection();
selection.from = selection.to = selection.start;
this.model.select( selection );
}
};
es.SurfaceView.prototype.handleEnter = function() {
var selection = this.currentSelection.clone(),
tx;
if ( selection.from !== selection.to ) {
this.handleDelete();
}
var node = this.documentView.getNodeFromOffset( selection.to, false ),
nodeOffset = this.documentView.getOffsetFromNode( node, false );
if (
nodeOffset + node.getContentLength() + 1 === selection.to &&
node === es.DocumentViewNode.getSplitableNode( node )
) {
tx = this.documentView.model.prepareInsertion(
nodeOffset + node.getElementLength(),
[ { 'type': 'paragraph' }, { 'type': '/paragraph' } ]
);
this.model.transact( tx );
selection.from = selection.to = nodeOffset + node.getElementLength() + 1;
} else {
var stack = [],
splitable = false;
es.DocumentNode.traverseUpstream( node, function( node ) {
var elementType = node.model.getElementType();
if (
splitable === true &&
es.DocumentView.splitRules[ elementType ].children === true
) {
return false;
}
stack.splice(
stack.length / 2,
0,
{ 'type': '/' + elementType },
{
'type': elementType,
'attributes': es.copyObject( node.model.element.attributes )
}
);
splitable = es.DocumentView.splitRules[ elementType ].self;
} );
tx = this.documentView.model.prepareInsertion( selection.to, stack );
this.model.transact( tx );
selection.from = selection.to =
this.model.getDocument().getRelativeContentOffset( selection.to, 1 );
}
this.model.select( selection );
};
es.SurfaceView.prototype.insertFromInput = function() {
var selection = this.currentSelection.clone(),
val = this.$input.val();
this.$input.val( '' );
if ( val.length > 0 ) {
var tx;
if ( selection.from != selection.to ) {
tx = this.model.getDocument().prepareRemoval( selection );
this.model.transact( tx );
this.documentView.clearSelection();
selection.from = selection.to =
Math.min( selection.from, selection.to );
}
tx = this.model.getDocument().prepareInsertion( selection.from, val.split('') );
this.model.transact( tx );
selection.from += val.length;
selection.to += val.length;
this.model.select( selection );
}
};
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/**
* @param {String} direction up | down | left | right
* @param {String} unit char | word | line | node | page
*/
es.SurfaceView.prototype.moveCursor = function( direction, unit ) {
if ( direction !== 'up' && direction !== 'down' ) {
this.cursor.initialLeft = null;
}
var selection = this.currentSelection.clone(),
to,
offset;
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switch ( direction ) {
case 'left':
case 'right':
switch ( unit ) {
case 'char':
case 'word':
if ( this.keyboard.keys.shift || selection.from === selection.to ) {
offset = selection.to;
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} else {
offset = direction === 'left' ? selection.start : selection.end;
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}
to = this.model.getDocument().getRelativeContentOffset(
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offset,
direction === 'left' ? -1 : 1
);
if ( unit === 'word' ) {
var wordRange = this.model.getDocument().getWordBoundaries(
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direction === 'left' ? to : offset
);
if ( wordRange ) {
to = direction === 'left' ? wordRange.start : wordRange.end;
}
}
break;
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case 'line':
offset = this.cursor.initialBias ?
this.model.getDocument().getRelativeContentOffset(
selection.to,
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-1) :
selection.to;
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var range = this.documentView.getRenderedLineRangeFromOffset( offset );
to = direction === 'left' ? range.start : range.end;
break;
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}
break;
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case 'up':
case 'down':
switch ( unit ) {
case 'unit':
var toNode = null;
this.model.getDocument().traverseLeafNodes(
function( node ) {
if ( toNode === null) {
toNode = node;
} else {
toNode = node;
return false;
}
},
this.documentView.getNodeFromOffset( selection.to, false ).getModel(),
direction === 'up' ? true : false
);
to = this.model.getDocument().getOffsetFromNode( toNode, false ) + 1;
break;
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case 'char':
/*
* Looks for the in-document character position that would match up with the
* same horizontal position - jumping a few pixels up/down at a time until we
* reach the next/previous line
*/
var position = this.documentView.getRenderedPositionFromOffset(
selection.to,
this.cursor.initialBias
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);
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if ( this.cursor.initialLeft === null ) {
this.cursor.initialLeft = position.left;
}
var fakePosition = new es.Position( this.cursor.initialLeft, position.top ),
i = 0,
step = direction === 'up' ? -5 : 5,
top = this.$.position().top;
this.cursor.initialBias = position.left > this.documentView.getNodeFromOffset(
selection.to, false
).contentView.$.offset().left;
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do {
fakePosition.top += ++i * step;
if ( fakePosition.top < top ) {
break;
} else if (
fakePosition.top > top + this.dimensions.height +
this.dimensions.scrollTop
) {
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break;
}
fakePosition = this.documentView.getRenderedPositionFromOffset(
this.documentView.getOffsetFromRenderedPosition( fakePosition ),
this.cursor.initialBias
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);
fakePosition.left = this.cursor.initialLeft;
} while ( position.top === fakePosition.top );
to = this.documentView.getOffsetFromRenderedPosition( fakePosition );
break;
}
break;
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}
if( direction != 'up' && direction != 'down' ) {
this.cursor.initialBias = direction === 'right' && unit === 'line' ? true : false;
}
if ( this.keyboard.keys.shift && selection.from !== to) {
selection.to = to;
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} else {
if ( selection.from !== selection.to ) {
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this.documentView.clearSelection();
}
selection.from = selection.to = to;
}
this.model.select( selection );
};
/**
* Shows the cursor in a new position.
*
* @method
* @param offset {Integer} Position to show the cursor at
*/
es.SurfaceView.prototype.showCursor = function() {
var $window = $( window ),
position = this.documentView.getRenderedPositionFromOffset(
this.currentSelection.to, this.cursor.initialBias
);
this.$cursor.css( {
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'left': position.left,
'top': position.top,
'height': position.bottom - position.top
} ).show();
this.$input.css({
'top': position.top,
'height': position.bottom - position.top
});
// Auto scroll to cursor
var inputTop = this.$input.offset().top,
inputBottom = inputTop + position.bottom - position.top;
if ( inputTop - this.dimensions.toolbarHeight < this.dimensions.scrollTop ) {
$window.scrollTop( inputTop - this.dimensions.toolbarHeight );
} else if ( inputBottom > ( this.dimensions.scrollTop + this.dimensions.height ) ) {
$window.scrollTop( inputBottom - this.dimensions.height );
}
// cursor blinking
if ( this.cursor.interval ) {
clearInterval( this.cursor.interval );
}
var _this = this;
this.cursor.interval = setInterval( function( surface ) {
_this.$cursor.css( 'display', function( index, value ) {
return value === 'block' ? 'none' : 'block';
} );
}, 500 );
};
/**
* Hides the cursor.
*
* @method
*/
es.SurfaceView.prototype.hideCursor = function() {
if( this.cursor.interval ) {
clearInterval( this.cursor.interval );
}
this.$cursor.hide();
};
/* Inheritance */
es.extendClass( es.SurfaceView, es.EventEmitter );