Ticket #6359: IESelection.js

(function() {
        var rangeOnMouseDown = null; // Stores the cursor position when the user first clicked.

        function getRangeAtPoint(px, py) {
                var range = ck.document.$.body.createTextRange();
                try {
                        range.moveToPoint(px, py);
                } catch (e) {
                        //If moveToPoint fails due to an IE bug ('Unknown Error'), just go to the end of the current range.
                        range.collapse(false);
                }
                return range;
        }

        function getRangeAtEndOfDoc() {
                var range = ck.document.$.body.createTextRange();
                range.expand('textedit');
                range.collapse(false); // false == move to end
                return range;
        }

        function getRangeAtBeginOfDoc() {
                var range = ck.document.$.body.createTextRange();
                range.expand('textedit');
                range.collapse(true); // true == move to start.
                return range;
        }

        var fxnSelectFromMouseToEndOfDoc = function(event) {
                event.preventDefault();
                if (event.button !== 1) {
                        // The mouse button has been released, but we didn't get a mouseup event, so lets unbind.
                        jDocHtml.unbind('mousemove.ieselectionfix');
                        return;
                }

                try {
                        var rangeCurrent = getRangeAtPoint(event.pageX, event.pageY);
                        // If the range has no parent element, the mouse is probably between paragraphs.
                        // IE will move the range to the beginning of the document. This creates lots of
                        // obnoxious flashing when selecting across paragraphs, so don't do anything when
                        // this happens.
                        if (!rangeCurrent.parentElement()) {
                                return;
                        }

                        var rangeToSelect = ck.document.$.body.createTextRange();
                        if (rangeCurrent.compareEndPoints('StartToStart', rangeOnMouseDown) > 0) {
                                // rangeCurrent is at or right of rangeOnMouseDown.
                                rangeToSelect.setEndPoint('StartToStart', rangeOnMouseDown);
                                rangeToSelect.setEndPoint('EndToEnd', rangeCurrent);
                        } else {
                                // rangeCurrent is left of rangeOnMouseDown.
                                rangeToSelect.setEndPoint('StartToStart', rangeCurrent);
                                rangeToSelect.setEndPoint('EndToEnd', rangeOnMouseDown);
                        }
                        rangeToSelect.select();
                } catch (exception) {
                        ;
                }
        };

        var jDocHtml = $('html', ck.document.$);
        jDocHtml.mousedown(function(event) {
                // We only want to move the cursor if nothing inside the document was clicked
                if (event.target == this) {
                        //alert(event.target.tagName);
                        try {
                                rangeOnMouseDown = getRangeAtPoint(event.pageX, event.pageY);
                                rangeOnMouseDown.select();
                                jDocHtml.bind('mousemove.ieselectionfix', fxnSelectFromMouseToEndOfDoc);
                        } catch (exc) {
                                //alert('error');
                                jDocHtml.unbind('mousemove.ieselectionfix');
                        }
                        event.preventDefault();
                }
        });

        jDocHtml.mouseup(function(event) {
                jDocHtml.unbind('mousemove.ieselectionfix');
        });

        // When the user double-clicks, select the word underneath their cursor.
        jDocHtml.dblclick(function(event) {
                if (event.target == this) {
                        try {
                                var range = getRangeAtPoint(event.pageX, event.pageY);
                                range.expand('word');
                                range.select();
                        } catch (exc) {
                                ;
                        }
                }
        });
} ());