svgedit/editor/extensions/ext-overview_window.js

/* eslint-disable no-var */
/* globals svgEditor, svgedit, $ */
/*
 * ext-overview_window.js
 *
 * Licensed under the MIT License
 *
 * Copyright(c) 2013 James Sacksteder
 *
 */

var overviewWindowGlobals = {};
svgEditor.addExtension('overview_window', function () {
	'use strict';
	// Disabled in Chrome 48-, see https://github.com/SVG-Edit/svgedit/issues/26 and
	// https://code.google.com/p/chromium/issues/detail?id=565120.
	if (svgedit.browser.isChrome()) {
		var verIndex = navigator.userAgent.indexOf('Chrome/') + 7;
		var chromeVersion = parseInt(navigator.userAgent.substring(verIndex), 10);
		if (chromeVersion < 49) {
			return;
		}
	}

	// Define and insert the base html element.
	var propsWindowHtml =
		'<div id="overview_window_content_pane" style="width:100%; word-wrap:break-word;  display:inline-block; margin-top:20px;">' +
			'<div id="overview_window_content" style="position:relative; left:12px; top:0px;">' +
				'<div style="background-color:#A0A0A0; display:inline-block; overflow:visible;">' +
					'<svg id="overviewMiniView" width="150" height="100" x="0" y="0" viewBox="0 0 4800 3600" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">' +
						'<use x="0" y="0" xlink:href="#svgroot"> </use>' +
					'</svg>' +
					'<div id="overview_window_view_box" style="min-width:50px; min-height:50px; position:absolute; top:30px; left:30px; z-index:5; background-color:rgba(255,0,102,0.3);">' +
					'</div>' +
				'</div>' +
			'</div>' +
		'</div>';
	$('#sidepanels').append(propsWindowHtml);

	// Define dynamic animation of the view box.
	var updateViewBox = function () {
		var portHeight = parseFloat($('#workarea').css('height'));
		var portWidth = parseFloat($('#workarea').css('width'));
		var portX = $('#workarea').scrollLeft();
		var portY = $('#workarea').scrollTop();
		var windowWidth = parseFloat($('#svgcanvas').css('width'));
		var windowHeight = parseFloat($('#svgcanvas').css('height'));
		var overviewWidth = $('#overviewMiniView').attr('width');
		var overviewHeight = $('#overviewMiniView').attr('height');

		var viewBoxX = portX / windowWidth * overviewWidth;
		var viewBoxY = portY / windowHeight * overviewHeight;
		var viewBoxWidth = portWidth / windowWidth * overviewWidth;
		var viewBoxHeight = portHeight / windowHeight * overviewHeight;

		$('#overview_window_view_box').css('min-width', viewBoxWidth + 'px');
		$('#overview_window_view_box').css('min-height', viewBoxHeight + 'px');
		$('#overview_window_view_box').css('top', viewBoxY + 'px');
		$('#overview_window_view_box').css('left', viewBoxX + 'px');
	};
	$('#workarea').scroll(function () {
		if (!(overviewWindowGlobals.viewBoxDragging)) {
			updateViewBox();
		}
	});
	$('#workarea').resize(updateViewBox);
	updateViewBox();

	// Compensate for changes in zoom and canvas size.
	var updateViewDimensions = function () {
		var viewWidth = $('#svgroot').attr('width');
		var viewHeight = $('#svgroot').attr('height');
		var viewX = 640;
		var viewY = 480;

		if (svgedit.browser.isIE()) {
			// This has only been tested with Firefox 10 and IE 9 (without chrome frame).
			// I am not sure if if is Firefox or IE that is being non compliant here.
			// Either way the one that is noncompliant may become more compliant later.
			// TAG:HACK
			// TAG:VERSION_DEPENDENT
			// TAG:BROWSER_SNIFFING
			viewX = 0;
			viewY = 0;
		}

		var svgWidthOld = $('#overviewMiniView').attr('width');
		var svgHeightNew = viewHeight / viewWidth * svgWidthOld;
		$('#overviewMiniView').attr('viewBox', viewX + ' ' + viewY + ' ' + viewWidth + ' ' + viewHeight);
		$('#overviewMiniView').attr('height', svgHeightNew);
		updateViewBox();
	};
	updateViewDimensions();

	// Set up the overview window as a controller for the view port.
	overviewWindowGlobals.viewBoxDragging = false;
	var updateViewPortFromViewBox = function () {
		var windowWidth = parseFloat($('#svgcanvas').css('width'));
		var windowHeight = parseFloat($('#svgcanvas').css('height'));
		var overviewWidth = $('#overviewMiniView').attr('width');
		var overviewHeight = $('#overviewMiniView').attr('height');
		var viewBoxX = parseFloat($('#overview_window_view_box').css('left'));
		var viewBoxY = parseFloat($('#overview_window_view_box').css('top'));

		var portX = viewBoxX / overviewWidth * windowWidth;
		var portY = viewBoxY / overviewHeight * windowHeight;

		$('#workarea').scrollLeft(portX);
		$('#workarea').scrollTop(portY);
	};
	$('#overview_window_view_box').draggable({
		containment: 'parent',
		drag: updateViewPortFromViewBox,
		start: function () { overviewWindowGlobals.viewBoxDragging = true; },
		stop: function () { overviewWindowGlobals.viewBoxDragging = false; }
	});
	$('#overviewMiniView').click(function (evt) {
		// Firefox doesn't support evt.offsetX and evt.offsetY.
		var mouseX = (evt.offsetX || evt.originalEvent.layerX);
		var mouseY = (evt.offsetY || evt.originalEvent.layerY);
		var overviewWidth = $('#overviewMiniView').attr('width');
		var overviewHeight = $('#overviewMiniView').attr('height');
		var viewBoxWidth = parseFloat($('#overview_window_view_box').css('min-width'));
		var viewBoxHeight = parseFloat($('#overview_window_view_box').css('min-height'));

		var viewBoxX = mouseX - 0.5 * viewBoxWidth;
		var viewBoxY = mouseY - 0.5 * viewBoxHeight;
		// deal with constraints
		if (viewBoxX < 0) {
			viewBoxX = 0;
		}
		if (viewBoxY < 0) {
			viewBoxY = 0;
		}
		if (viewBoxX + viewBoxWidth > overviewWidth) {
			viewBoxX = overviewWidth - viewBoxWidth;
		}
		if (viewBoxY + viewBoxHeight > overviewHeight) {
			viewBoxY = overviewHeight - viewBoxHeight;
		}

		$('#overview_window_view_box').css('top', viewBoxY + 'px');
		$('#overview_window_view_box').css('left', viewBoxX + 'px');
		updateViewPortFromViewBox();
	});

	return {
		name: 'overview window',
		canvasUpdated: updateViewDimensions,
		workareaResized: updateViewBox
	};
});