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790 lines
24 KiB
790 lines
24 KiB
let util = require('../../../../util');
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let ComponentUtil = require('./ComponentUtil').default;
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let LabelSplitter = require('./LabelSplitter').default;
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/**
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* @typedef {'bold'|'ital'|'boldital'|'mono'|'normal'} MultiFontStyle
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*
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* The allowed specifiers of multi-fonts.
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*/
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/**
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* @typedef {{color:string, size:number, face:string, mod:string, vadjust:number}} MultiFontOptions
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*
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* The full set of options of a given multi-font.
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*/
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/**
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* @typedef {Array.<object>} Pile
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*
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* Sequence of option objects, the order is significant.
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* The sequence is used to determine the value of a given option.
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*
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* Usage principles:
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*
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* - All search is done in the sequence of the pile.
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* - As soon as a value is found, the searching stops.
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* - prototypes are totally ignored. The idea is to add option objects used as prototypes
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* to the pile, in the correct order.
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*/
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/**
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* List of special styles for multi-fonts
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* @private
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*/
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const multiFontStyle = ['bold', 'ital', 'boldital', 'mono'];
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/**
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* A Label to be used for Nodes or Edges.
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*/
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class Label {
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/**
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* @param {Object} body
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* @param {Object} options
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* @param {boolean} [edgelabel=false]
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*/
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constructor(body, options, edgelabel = false) {
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this.body = body;
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this.pointToSelf = false;
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this.baseSize = undefined;
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this.fontOptions = {}; // instance variable containing the *instance-local* font options
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this.setOptions(options);
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this.size = {top: 0, left: 0, width: 0, height: 0, yLine: 0};
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this.isEdgeLabel = edgelabel;
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}
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/**
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* @param {Object} options the options of the parent Node-instance
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*/
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setOptions(options) {
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this.elementOptions = options; // Reference to the options of the parent Node-instance
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this.initFontOptions(options.font);
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if (ComponentUtil.isValidLabel(options.label)) {
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this.labelDirty = true;
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} else {
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// Bad label! Change the option value to prevent bad stuff happening
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options.label = '';
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}
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if (options.font !== undefined && options.font !== null) { // font options can be deleted at various levels
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if (typeof options.font === 'string') {
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this.baseSize = this.fontOptions.size;
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}
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else if (typeof options.font === 'object') {
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let size = options.font.size;
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if (size !== undefined) {
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this.baseSize = size;
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}
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}
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}
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}
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/**
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* Init the font Options structure.
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*
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* Member fontOptions serves as an accumulator for the current font options.
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* As such, it needs to be completely separated from the node options.
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*
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* @param {Object} newFontOptions the new font options to process
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* @private
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*/
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initFontOptions(newFontOptions) {
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// Prepare the multi-font option objects.
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// These will be filled in propagateFonts(), if required
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util.forEach(multiFontStyle, (style) => {
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this.fontOptions[style] = {};
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});
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// Handle shorthand option, if present
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if (Label.parseFontString(this.fontOptions, newFontOptions)) {
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this.fontOptions.vadjust = 0;
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return;
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}
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// Copy over the non-multifont options, if specified
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util.forEach(newFontOptions, (prop, n) => {
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if (prop !== undefined && prop !== null && typeof prop !== 'object') {
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this.fontOptions[n] = prop;
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}
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});
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}
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/**
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* If in-variable is a string, parse it as a font specifier.
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*
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* Note that following is not done here and have to be done after the call:
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* - No number conversion (size)
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* - Not all font options are set (vadjust, mod)
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*
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* @param {Object} outOptions out-parameter, object in which to store the parse results (if any)
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* @param {Object} inOptions font options to parse
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* @return {boolean} true if font parsed as string, false otherwise
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* @static
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*/
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static parseFontString(outOptions, inOptions) {
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if (!inOptions || typeof inOptions !== 'string') return false;
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let newOptionsArray = inOptions.split(" ");
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outOptions.size = newOptionsArray[0].replace("px",'');
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outOptions.face = newOptionsArray[1];
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outOptions.color = newOptionsArray[2];
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return true;
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}
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/**
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* Set the width and height constraints based on 'nearest' value
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* @param {Array} pile array of option objects to consider
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* @private
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*/
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constrain(pile) {
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this.fontOptions.constrainWidth = false;
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this.fontOptions.maxWdt = -1;
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this.fontOptions.minWdt = -1;
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let widthConstraint = util.topMost(pile, 'widthConstraint');
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if (typeof widthConstraint === 'number') {
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this.fontOptions.maxWdt = Number(widthConstraint);
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this.fontOptions.minWdt = Number(widthConstraint);
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} else if (typeof widthConstraint === 'object') {
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let widthConstraintMaximum = util.topMost(pile, ['widthConstraint', 'maximum']);
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if (typeof widthConstraintMaximum === 'number') {
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this.fontOptions.maxWdt = Number(widthConstraintMaximum);
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}
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let widthConstraintMinimum = util.topMost(pile, ['widthConstraint', 'minimum'])
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if (typeof widthConstraintMinimum === 'number') {
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this.fontOptions.minWdt = Number(widthConstraintMinimum);
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}
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}
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this.fontOptions.constrainHeight = false;
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this.fontOptions.minHgt = -1;
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this.fontOptions.valign = 'middle';
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let heightConstraint = util.topMost(pile, 'heightConstraint');
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if (typeof heightConstraint === 'number') {
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this.fontOptions.minHgt = Number(heightConstraint);
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} else if (typeof heightConstraint === 'object') {
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let heightConstraintMinimum = util.topMost(pile, ['heightConstraint', 'minimum']);
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if (typeof heightConstraintMinimum === 'number') {
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this.fontOptions.minHgt = Number(heightConstraintMinimum);
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}
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let heightConstraintValign = util.topMost(pile, ['heightConstraint', 'valign']);
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if (typeof heightConstraintValign === 'string') {
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if ((heightConstraintValign === 'top')||(heightConstraintValign === 'bottom')) {
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this.fontOptions.valign = heightConstraintValign;
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}
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}
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}
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}
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/**
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* Set options and update internal state
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*
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* @param {Object} options options to set
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* @param {Array} pile array of option objects to consider for option 'chosen'
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*/
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update(options, pile) {
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this.setOptions(options, true);
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this.constrain(pile);
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this.propagateFonts(pile);
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this.fontOptions.chooser = ComponentUtil.choosify('label', pile);
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}
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/**
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* When margins are set in an element, adjust sizes is called to remove them
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* from the width/height constraints. This must be done prior to label sizing.
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*
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* @param {{top: number, right: number, bottom: number, left: number}} margins
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*/
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adjustSizes(margins) {
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let widthBias = (margins) ? (margins.right + margins.left) : 0;
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if (this.fontOptions.constrainWidth) {
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this.fontOptions.maxWdt -= widthBias;
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this.fontOptions.minWdt -= widthBias;
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}
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let heightBias = (margins) ? (margins.top + margins.bottom) : 0;
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if (this.fontOptions.constrainHeight) {
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this.fontOptions.minHgt -= heightBias;
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}
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}
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/////////////////////////////////////////////////////////
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// Methods for handling options piles
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// Eventually, these will be moved to a separate class
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/////////////////////////////////////////////////////////
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/**
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* Add the font members of the passed list of option objects to the pile.
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*
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* @param {Pile} dstPile pile of option objects add to
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* @param {Pile} srcPile pile of option objects to take font options from
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* @private
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*/
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addFontOptionsToPile(dstPile, srcPile) {
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for (let i = 0; i < srcPile.length; ++i) {
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this.addFontToPile(dstPile, srcPile[i]);
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}
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}
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/**
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* Add given font option object to the list of objects (the 'pile') to consider for determining
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* multi-font option values.
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*
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* @param {Pile} pile pile of option objects to use
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* @param {object} options instance to add to pile
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* @private
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*/
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addFontToPile(pile, options) {
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if (options === undefined) return;
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if (options.font === undefined || options.font === null) return;
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let item = options.font;
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pile.push(item);
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}
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/**
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* Collect all own-property values from the font pile that aren't multi-font option objectss.
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*
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* @param {Pile} pile pile of option objects to use
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* @returns {object} object with all current own basic font properties
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* @private
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*/
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getBasicOptions(pile) {
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let ret = {};
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// Scans the whole pile to get all options present
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for (let n = 0; n < pile.length; ++n) {
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let fontOptions = pile[n];
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// Convert shorthand if necessary
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let tmpShorthand = {};
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if (Label.parseFontString(tmpShorthand, fontOptions)) {
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fontOptions = tmpShorthand;
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}
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util.forEach(fontOptions, (opt, name) => {
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if (opt === undefined) return; // multi-font option need not be present
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if (ret.hasOwnProperty(name)) return; // Keep first value we encounter
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if (multiFontStyle.indexOf(name) !== -1) {
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// Skip multi-font properties but we do need the structure
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ret[name] = {};
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} else {
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ret[name] = opt;
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}
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});
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}
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return ret;
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}
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/**
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* Return the value for given option for the given multi-font.
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*
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* All available option objects are trawled in the set order to construct the option values.
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*
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* ---------------------------------------------------------------------
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* ## Traversal of pile for multi-fonts
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*
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* The determination of multi-font option values is a special case, because any values not
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* present in the multi-font options should by definition be taken from the main font options,
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* i.e. from the current 'parent' object of the multi-font option.
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*
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* ### Search order for multi-fonts
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*
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* 'bold' used as example:
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*
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* - search in option group 'bold' in local properties
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* - search in main font option group in local properties
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*
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* ---------------------------------------------------------------------
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*
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* @param {Pile} pile pile of option objects to use
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* @param {MultiFontStyle} multiName sub path for the multi-font
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* @param {string} option the option to search for, for the given multi-font
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* @returns {string|number} the value for the given option
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* @private
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*/
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getFontOption(pile, multiName, option) {
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let multiFont;
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// Search multi font in local properties
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for (let n = 0; n < pile.length; ++n) {
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let fontOptions = pile[n];
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if (fontOptions.hasOwnProperty(multiName)) {
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multiFont = fontOptions[multiName];
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if (multiFont === undefined || multiFont === null) continue;
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// Convert shorthand if necessary
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// TODO: inefficient to do this conversion every time; find a better way.
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let tmpShorthand = {};
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if (Label.parseFontString(tmpShorthand, multiFont)) {
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multiFont = tmpShorthand;
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}
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if (multiFont.hasOwnProperty(option)) {
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return multiFont[option];
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}
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}
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}
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// Option is not mentioned in the multi font options; take it from the parent font options.
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// These have already been converted with getBasicOptions(), so use the converted values.
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if (this.fontOptions.hasOwnProperty(option)) {
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return this.fontOptions[option];
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}
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// A value **must** be found; you should never get here.
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throw new Error("Did not find value for multi-font for property: '" + option + "'");
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}
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/**
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* Return all options values for the given multi-font.
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*
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* All available option objects are trawled in the set order to construct the option values.
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*
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* @param {Pile} pile pile of option objects to use
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* @param {MultiFontStyle} multiName sub path for the mod-font
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* @returns {MultiFontOptions}
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* @private
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*/
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getFontOptions(pile, multiName) {
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let result = {};
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let optionNames = ['color', 'size', 'face', 'mod', 'vadjust']; // List of allowed options per multi-font
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for (let i = 0; i < optionNames.length; ++i) {
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let mod = optionNames[i];
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result[mod] = this.getFontOption(pile, multiName, mod);
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}
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return result;
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}
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/////////////////////////////////////////////////////////
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// End methods for handling options piles
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/////////////////////////////////////////////////////////
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/**
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* Collapse the font options for the multi-font to single objects, from
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* the chain of option objects passed (the 'pile').
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*
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* @param {Pile} pile sequence of option objects to consider.
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* First item in list assumed to be the newly set options.
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*/
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propagateFonts(pile) {
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let fontPile = []; // sequence of font objects to consider, order important
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// Note that this.elementOptions is not used here.
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this.addFontOptionsToPile(fontPile, pile);
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this.fontOptions = this.getBasicOptions(fontPile);
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// We set multifont values even if multi === false, for consistency (things break otherwise)
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for (let i = 0; i < multiFontStyle.length; ++i) {
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let mod = multiFontStyle[i];
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let modOptions = this.fontOptions[mod];
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let tmpMultiFontOptions = this.getFontOptions(fontPile, mod);
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// Copy over found values
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util.forEach(tmpMultiFontOptions, (option, n) => {
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modOptions[n] = option;
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});
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modOptions.size = Number(modOptions.size);
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modOptions.vadjust = Number(modOptions.vadjust);
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}
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}
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/**
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* Main function. This is called from anything that wants to draw a label.
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* @param {CanvasRenderingContext2D} ctx
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* @param {number} x
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* @param {number} y
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* @param {boolean} selected
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* @param {boolean} hover
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* @param {string} [baseline='middle']
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*/
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draw(ctx, x, y, selected, hover, baseline = 'middle') {
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// if no label, return
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if (this.elementOptions.label === undefined)
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return;
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// check if we have to render the label
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let viewFontSize = this.fontOptions.size * this.body.view.scale;
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if (this.elementOptions.label && viewFontSize < this.elementOptions.scaling.label.drawThreshold - 1)
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return;
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// This ensures that there will not be HUGE letters on screen
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// by setting an upper limit on the visible text size (regardless of zoomLevel)
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if (viewFontSize >= this.elementOptions.scaling.label.maxVisible) {
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viewFontSize = Number(this.elementOptions.scaling.label.maxVisible) / this.body.view.scale;
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}
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// update the size cache if required
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this.calculateLabelSize(ctx, selected, hover, x, y, baseline);
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this._drawBackground(ctx);
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this._drawText(ctx, x, this.size.yLine, baseline, viewFontSize);
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}
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/**
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* Draws the label background
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* @param {CanvasRenderingContext2D} ctx
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* @private
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*/
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_drawBackground(ctx) {
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if (this.fontOptions.background !== undefined && this.fontOptions.background !== "none") {
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ctx.fillStyle = this.fontOptions.background;
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let size = this.getSize();
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ctx.fillRect(size.left, size.top, size.width, size.height);
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}
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}
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/**
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*
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* @param {CanvasRenderingContext2D} ctx
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* @param {number} x
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* @param {number} y
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* @param {string} [baseline='middle']
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* @param {number} viewFontSize
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* @private
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*/
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_drawText(ctx, x, y, baseline = 'middle', viewFontSize) {
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[x, y] = this._setAlignment(ctx, x, y, baseline);
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ctx.textAlign = 'left';
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x = x - this.size.width / 2; // Shift label 1/2-distance to the left
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if ((this.fontOptions.valign) && (this.size.height > this.size.labelHeight)) {
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if (this.fontOptions.valign === 'top') {
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y -= (this.size.height - this.size.labelHeight) / 2;
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}
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if (this.fontOptions.valign === 'bottom') {
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y += (this.size.height - this.size.labelHeight) / 2;
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}
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}
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// draw the text
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for (let i = 0; i < this.lineCount; i++) {
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let line = this.lines[i];
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if (line && line.blocks) {
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let width = 0;
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if (this.isEdgeLabel || this.fontOptions.align === 'center') {
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width += (this.size.width - line.width) / 2
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} else if (this.fontOptions.align === 'right') {
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width += (this.size.width - line.width)
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}
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for (let j = 0; j < line.blocks.length; j++) {
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let block = line.blocks[j];
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ctx.font = block.font;
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let [fontColor, strokeColor] = this._getColor(block.color, viewFontSize, block.strokeColor);
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if (block.strokeWidth > 0) {
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ctx.lineWidth = block.strokeWidth;
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ctx.strokeStyle = strokeColor;
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ctx.lineJoin = 'round';
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}
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ctx.fillStyle = fontColor;
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if (block.strokeWidth > 0) {
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ctx.strokeText(block.text, x + width, y + block.vadjust);
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}
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ctx.fillText(block.text, x + width, y + block.vadjust);
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width += block.width;
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}
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y += line.height;
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}
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}
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}
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/**
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*
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* @param {CanvasRenderingContext2D} ctx
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* @param {number} x
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* @param {number} y
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* @param {string} baseline
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* @returns {Array.<number>}
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* @private
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*/
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_setAlignment(ctx, x, y, baseline) {
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// check for label alignment (for edges)
|
|
// TODO: make alignment for nodes
|
|
if (this.isEdgeLabel && this.fontOptions.align !== 'horizontal' && this.pointToSelf === false) {
|
|
x = 0;
|
|
y = 0;
|
|
|
|
let lineMargin = 2;
|
|
if (this.fontOptions.align === 'top') {
|
|
ctx.textBaseline = 'alphabetic';
|
|
y -= 2 * lineMargin; // distance from edge, required because we use alphabetic. Alphabetic has less difference between browsers
|
|
}
|
|
else if (this.fontOptions.align === 'bottom') {
|
|
ctx.textBaseline = 'hanging';
|
|
y += 2 * lineMargin;// distance from edge, required because we use hanging. Hanging has less difference between browsers
|
|
}
|
|
else {
|
|
ctx.textBaseline = 'middle';
|
|
}
|
|
}
|
|
else {
|
|
ctx.textBaseline = baseline;
|
|
}
|
|
return [x,y];
|
|
}
|
|
|
|
/**
|
|
* fade in when relative scale is between threshold and threshold - 1.
|
|
* If the relative scale would be smaller than threshold -1 the draw function would have returned before coming here.
|
|
*
|
|
* @param {string} color The font color to use
|
|
* @param {number} viewFontSize
|
|
* @param {string} initialStrokeColor
|
|
* @returns {Array.<string>} An array containing the font color and stroke color
|
|
* @private
|
|
*/
|
|
_getColor(color, viewFontSize, initialStrokeColor) {
|
|
let fontColor = color || '#000000';
|
|
let strokeColor = initialStrokeColor || '#ffffff';
|
|
if (viewFontSize <= this.elementOptions.scaling.label.drawThreshold) {
|
|
let opacity = Math.max(0, Math.min(1, 1 - (this.elementOptions.scaling.label.drawThreshold - viewFontSize)));
|
|
fontColor = util.overrideOpacity(fontColor, opacity);
|
|
strokeColor = util.overrideOpacity(strokeColor, opacity);
|
|
}
|
|
return [fontColor, strokeColor];
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @param {boolean} selected
|
|
* @param {boolean} hover
|
|
* @returns {{width: number, height: number}}
|
|
*/
|
|
getTextSize(ctx, selected = false, hover = false) {
|
|
this._processLabel(ctx, selected, hover);
|
|
return {
|
|
width: this.size.width,
|
|
height: this.size.height,
|
|
lineCount: this.lineCount
|
|
};
|
|
}
|
|
|
|
|
|
/**
|
|
* Get the current dimensions of the label
|
|
*
|
|
* @return {rect}
|
|
*/
|
|
getSize() {
|
|
let lineMargin = 2;
|
|
let x = this.size.left; // default values which might be overridden below
|
|
let y = this.size.top - 0.5*lineMargin; // idem
|
|
|
|
if (this.isEdgeLabel) {
|
|
const x2 = -this.size.width * 0.5;
|
|
|
|
switch (this.fontOptions.align) {
|
|
case 'middle':
|
|
x = x2;
|
|
y = -this.size.height * 0.5
|
|
break;
|
|
case 'top':
|
|
x = x2;
|
|
y = -(this.size.height + lineMargin);
|
|
break;
|
|
case 'bottom':
|
|
x = x2;
|
|
y = lineMargin;
|
|
break;
|
|
}
|
|
}
|
|
|
|
var ret = {
|
|
left : x,
|
|
top : y,
|
|
width : this.size.width,
|
|
height: this.size.height,
|
|
};
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
*
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @param {boolean} selected
|
|
* @param {boolean} hover
|
|
* @param {number} [x=0]
|
|
* @param {number} [y=0]
|
|
* @param {'middle'|'hanging'} [baseline='middle']
|
|
*/
|
|
calculateLabelSize(ctx, selected, hover, x = 0, y = 0, baseline = 'middle') {
|
|
this._processLabel(ctx, selected, hover);
|
|
this.size.left = x - this.size.width * 0.5;
|
|
this.size.top = y - this.size.height * 0.5;
|
|
this.size.yLine = y + (1 - this.lineCount) * 0.5 * this.fontOptions.size;
|
|
if (baseline === "hanging") {
|
|
this.size.top += 0.5 * this.fontOptions.size;
|
|
this.size.top += 4; // distance from node, required because we use hanging. Hanging has less difference between browsers
|
|
this.size.yLine += 4; // distance from node
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
*
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @param {boolean} selected
|
|
* @param {boolean} hover
|
|
* @param {string} mod
|
|
* @returns {{color, size, face, mod, vadjust, strokeWidth: *, strokeColor: (*|string|allOptions.edges.font.strokeColor|{string}|allOptions.nodes.font.strokeColor|Array)}}
|
|
*/
|
|
getFormattingValues(ctx, selected, hover, mod) {
|
|
let getValue = function(fontOptions, mod, option) {
|
|
if (mod === "normal") {
|
|
if (option === 'mod' ) return "";
|
|
return fontOptions[option];
|
|
}
|
|
|
|
if (fontOptions[mod][option] !== undefined) { // Grumbl leaving out test on undefined equals false for ""
|
|
return fontOptions[mod][option];
|
|
} else {
|
|
// Take from parent font option
|
|
return fontOptions[option];
|
|
}
|
|
};
|
|
|
|
let values = {
|
|
color : getValue(this.fontOptions, mod, 'color' ),
|
|
size : getValue(this.fontOptions, mod, 'size' ),
|
|
face : getValue(this.fontOptions, mod, 'face' ),
|
|
mod : getValue(this.fontOptions, mod, 'mod' ),
|
|
vadjust: getValue(this.fontOptions, mod, 'vadjust'),
|
|
strokeWidth: this.fontOptions.strokeWidth,
|
|
strokeColor: this.fontOptions.strokeColor
|
|
};
|
|
if (selected || hover) {
|
|
if (mod === "normal" && (this.fontOptions.chooser === true) && (this.elementOptions.labelHighlightBold)) {
|
|
values.mod = 'bold';
|
|
} else {
|
|
if (typeof this.fontOptions.chooser === 'function') {
|
|
this.fontOptions.chooser(values, this.elementOptions.id, selected, hover);
|
|
}
|
|
}
|
|
}
|
|
|
|
let fontString = "";
|
|
if (values.mod !== undefined && values.mod !== "") { // safeguard for undefined - this happened
|
|
fontString += values.mod + " ";
|
|
}
|
|
fontString += values.size + "px " + values.face;
|
|
|
|
ctx.font = fontString.replace(/"/g, "");
|
|
values.font = ctx.font;
|
|
values.height = values.size;
|
|
return values;
|
|
}
|
|
|
|
|
|
/**
|
|
*
|
|
* @param {boolean} selected
|
|
* @param {boolean} hover
|
|
* @returns {boolean}
|
|
*/
|
|
differentState(selected, hover) {
|
|
return ((selected !== this.selectedState) || (hover !== this.hoverState));
|
|
}
|
|
|
|
|
|
/**
|
|
* This explodes the passed text into lines and determines the width, height and number of lines.
|
|
*
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @param {boolean} selected
|
|
* @param {boolean} hover
|
|
* @param {string} inText the text to explode
|
|
* @returns {{width, height, lines}|*}
|
|
* @private
|
|
*/
|
|
_processLabelText(ctx, selected, hover, inText) {
|
|
let splitter = new LabelSplitter(ctx, this, selected, hover);
|
|
return splitter.process(inText);
|
|
}
|
|
|
|
|
|
/**
|
|
* This explodes the label string into lines and sets the width, height and number of lines.
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @param {boolean} selected
|
|
* @param {boolean} hover
|
|
* @private
|
|
*/
|
|
_processLabel(ctx, selected, hover) {
|
|
|
|
if(this.labelDirty === false && !this.differentState(selected,hover))
|
|
return;
|
|
|
|
let state = this._processLabelText(ctx, selected, hover, this.elementOptions.label);
|
|
|
|
if ((this.fontOptions.minWdt > 0) && (state.width < this.fontOptions.minWdt)) {
|
|
state.width = this.fontOptions.minWdt;
|
|
}
|
|
|
|
this.size.labelHeight =state.height;
|
|
if ((this.fontOptions.minHgt > 0) && (state.height < this.fontOptions.minHgt)) {
|
|
state.height = this.fontOptions.minHgt;
|
|
}
|
|
|
|
this.lines = state.lines;
|
|
this.lineCount = state.lines.length;
|
|
this.size.width = state.width;
|
|
this.size.height = state.height;
|
|
this.selectedState = selected;
|
|
this.hoverState = hover;
|
|
|
|
this.labelDirty = false;
|
|
}
|
|
|
|
|
|
/**
|
|
* Check if this label is visible
|
|
*
|
|
* @return {boolean} true if this label will be show, false otherwise
|
|
*/
|
|
visible() {
|
|
if ((this.size.width === 0 || this.size.height === 0)
|
|
|| this.elementOptions.label === undefined) {
|
|
return false; // nothing to display
|
|
}
|
|
|
|
let viewFontSize = this.fontOptions.size * this.body.view.scale;
|
|
if (viewFontSize < this.elementOptions.scaling.label.drawThreshold - 1) {
|
|
return false; // Too small or too far away to show
|
|
}
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
export default Label;
|