ace/lib/ace/mouse/multi_select_mouse_handler.js

/* vim:ts=4:sts=4:sw=4:
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Ajax.org Code Editor (ACE).
 *
 * The Initial Developer of the Original Code is
 * Ajax.org B.V.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *      Harutyun Amirjanyan <amirjanyan AT gmail DOT com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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define(function(require, exports, module) {

var event = require("../lib/event");


// mouse
function isSamePoint(p1, p2) {
    return p1.row == p2.row && p1.column == p2.column
}

function onMouseDown(e) {
    var ev = e.domEvent;
    var alt = ev.altKey;
    var shift = ev.shiftKey;
    var ctrl = ev.ctrlKey;
    var button = e.getButton();

    if (!ctrl && !alt) {
        if (e.editor.selection.rangeCount > 1) {
            if (button == 0) {
                e.editor.exitMultiSelectMode();
            } else if (button == 2) {
                var editor = e.editor;
                var selectionEmpty = editor.selection.isEmpty();
                editor.textInput.onContextMenu({x: e.clientX, y: e.clientY}, selectionEmpty);
                event.capture(editor.container, function(){}, editor.textInput.onContextMenuClose);
                e.stop();
            }
        }
        return;
    }

    var editor = e.editor;
    var selection = editor.selection;
    var isMultiSelect = selection.rangeCount > 1
    var pos = e.getDocumentPosition();
    var rangeList = selection.rangeList;
    var cursor = selection.getCursor()
    var inSelection = e.inSelection() || (selection.isEmpty() && isSamePoint(pos, cursor));

    if (ctrl && !shift && !alt && button == 0) {
        if (!isMultiSelect && inSelection)
            return // dragging

        if (!isMultiSelect) {
            selection.addRange(selection.toOrientedRange());
        }
        if (inSelection)
            selection.clearSelection();

		var helper = selection.toOrientedRange();
		editor.addSelectionMarker(helper);

        var oldRange = rangeList.rangeAtPoint(pos);

        event.capture(editor.container, function(){}, function() {
            editor.removeSelectionMarkers([helper]);
            var tmpSel = selection.toOrientedRange();

            if (oldRange && tmpSel.isEmpty() && isSamePoint(oldRange.cursor, tmpSel.cursor)) {
				if (selection.rangeCount > 1) {
					range = editor.selection.rangeList.substractPoint(tmpSel.cursor);
					var range = editor.selection.rangeList.all[0];
					if (range)
						editor.selection.addRange(range);
				    return;
				}
            }

            selection.addRange(tmpSel);
        });

        //e.stop()
    } else if (!shift && alt && button == 0) {
        e.stop()
        var mouseX = e.pageX, mouseY = e.pageY;
        var onMouseSelection = function(e) {
            mouseX = event.getDocumentX(e);
            mouseY = event.getDocumentY(e);
        };

		if (isMultiSelect && !ctrl) {
			selection.single();
        }
		selection.moveCursorToPosition(pos);
		selection.clearSelection();

        var rectSel = [];
        var session = editor.session;        

        var onMouseSelectionEnd = function(e) {
            clearInterval(timerId);
            editor.removeSelectionMarkers(rectSel);
            for (var i = 0; i < rectSel.length; i++)
                selection.addRange(rectSel[i])
        };

        var anchor = selection.getCursor();
        var screenAnchor = editor.renderer.pixelToScreenCoordinates(mouseX, mouseY);
		var clippedAnchor = session.documentToScreenPosition(anchor);
		var screenCursor = screenAnchor;

        var onSelectionInterval = function() {
            var newCursor = editor.renderer.pixelToScreenCoordinates(mouseX, mouseY);
			var cursor = session.screenToDocumentPosition(newCursor.row, newCursor.column);
			
			if (isSamePoint(screenCursor, newCursor)
				&& isSamePoint(cursor, selection.selectionLead))
				return;
			screenCursor = newCursor;

           	editor.selection.moveCursorToPosition(cursor);
            editor.selection.clearSelection();
            editor.renderer.scrollCursorIntoView();
			
            editor.removeSelectionMarkers(rectSel);
            rectSel = selection.rectangularRangeBlock(screenCursor, screenAnchor);
            rectSel.forEach(editor.addSelectionMarker, editor);

            editor.renderer.updateCursor();
            editor.renderer.updateBackMarkers();
        };

        event.capture(editor.container, onMouseSelection, onMouseSelectionEnd);
        var timerId = setInterval(onSelectionInterval, 20);

        return e.preventDefault();
    }
}



exports.onMouseDown = onMouseDown;

});