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649 lines
21 KiB
649 lines
21 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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* 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 = {};
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this.setOptions(options);
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this.size = {top: 0, left: 0, width: 0, height: 0, yLine: 0}; // could be cached
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this.isEdgeLabel = edgelabel;
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}
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/**
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*
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* @param {Object} options
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* @param {boolean} [allowDeletion=false]
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*/
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setOptions(options, allowDeletion = false) {
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this.elementOptions = options;
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// We want to keep the font options separated from the node options.
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// The node options have to mirror the globals when they are not overruled.
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this.fontOptions = util.deepExtend({},options.font, true);
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if (options.label !== undefined) {
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this.labelDirty = true;
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}
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if (options.font !== undefined) {
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Label.parseOptions(this.fontOptions, options, allowDeletion);
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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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if (options.font.size !== undefined) {
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this.baseSize = options.font.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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*
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* @param {Object} parentOptions
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* @param {Object} newOptions
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* @param {boolean} [allowDeletion=false]
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* @static
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*/
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static parseOptions(parentOptions, newOptions, allowDeletion = false) {
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if (Label.parseFontString(parentOptions, newOptions.font)) {
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parentOptions.vadjust = 0;
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}
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else if (typeof newOptions.font === 'object') {
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util.fillIfDefined(parentOptions, newOptions.font, allowDeletion);
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}
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parentOptions.size = Number(parentOptions.size);
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parentOptions.vadjust = Number(parentOptions.vadjust);
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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.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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* Collapse the font options for the multi-font to single objects, from
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* the chain of option objects passed.
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*
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* If an option for a specific multi-font is not present, the parent
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* option is checked for the given option.
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*
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* NOTE: naming of 'groupOptions' is a misnomer; the actual value passed
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* is the new values to set from setOptions().
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*
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* @param {Object} options
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* @param {Object} groupOptions
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* @param {Object} defaultOptions
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*/
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propagateFonts(options, groupOptions, defaultOptions) {
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if (!this.fontOptions.multi) return;
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/**
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* Resolve the font options path.
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* If valid, return a reference to the object in question.
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* Otherwise, just return null.
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*
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* @param {Object} options base object to determine path from
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* @param {'bold'|'ital'|'boldital'|'mono'|'normal'} [mod=undefined] if present, sub path for the mod-font
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* @returns {Object|null}
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*/
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var pathP = function(options, mod) {
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if (!options || !options.font) return null;
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var opt = options.font;
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if (mod) {
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if (!opt[mod]) return null;
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opt = opt[mod];
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}
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return opt;
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};
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/**
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* Get property value from options.font[mod][property] if present.
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* If mod not passed, use property value from options.font[property].
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*
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* @param {Label.options} options
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* @param {'bold'|'ital'|'boldital'|'mono'|'normal'} mod
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* @param {string} property
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* @return {*|null} value if found, null otherwise.
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*/
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var getP = function(options, mod, property) {
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let opt = pathP(options, mod);
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if (opt && opt.hasOwnProperty(property)) {
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return opt[property];
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}
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return null;
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};
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let mods = [ 'bold', 'ital', 'boldital', 'mono' ];
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for (const mod of mods) {
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let modOptions = this.fontOptions[mod];
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let modDefaults = defaultOptions.font[mod];
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if (Label.parseFontString(modOptions, pathP(options, mod))) {
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modOptions.vadjust = this.fontOptions.vadjust;
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modOptions.mod = modDefaults.mod;
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} else {
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// We need to be crafty about loading the modded fonts. We want as
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// much 'natural' versatility as we can get, so a simple global
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// change propagates in an expected way, even if not stictly logical.
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// 'face' has a special exception for mono, since we probably
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// don't want to sync to the base font face.
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modOptions.face =
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getP(options , mod, 'face') ||
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getP(groupOptions, mod, 'face') ||
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(mod === 'mono'? modDefaults.face:null ) ||
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getP(groupOptions, null, 'face') ||
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this.fontOptions.face
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;
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// 'color' follows the standard flow
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modOptions.color =
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getP(options , mod, 'color') ||
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getP(groupOptions, mod, 'color') ||
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getP(groupOptions, null, 'color') ||
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this.fontOptions.color
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;
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// 'mode' follows the standard flow
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modOptions.mod =
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getP(options , mod, 'mod') ||
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getP(groupOptions, mod, 'mod') ||
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getP(groupOptions, null, 'mod') ||
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modDefaults.mod
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;
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// It's important that we size up defaults similarly if we're
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// using default faces unless overriden. We want to preserve the
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// ratios closely - but if faces have changed, all bets are off.
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let ratio;
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// NOTE: Following condition always fails, because modDefaults
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// has no explicit font property. This is deliberate, see
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// var's 'NodesHandler.defaultOptions.font[mod]'.
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// However, I want to keep the original logic while refactoring;
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// it appears to be working fine even if ratio is never set.
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// TODO: examine if this is a bug, fix if necessary.
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//
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if ((modOptions.face === modDefaults.face) &&
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(this.fontOptions.face === defaultOptions.font.face)) {
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ratio = this.fontOptions.size / Number(defaultOptions.font.size);
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}
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modOptions.size =
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getP(options , mod, 'size') ||
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getP(groupOptions, mod, 'size') ||
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(ratio? modDefaults.size * ratio: null) || // Scale the mod size using the same ratio
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getP(groupOptions, null, 'size') ||
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this.fontOptions.size
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;
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modOptions.vadjust =
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getP(options , mod, 'vadjust') ||
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getP(groupOptions, mod, 'vadjust') ||
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(ratio? modDefaults.vadjust * Math.round(ratio): null) || // Scale it using the same ratio
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this.fontOptions.vadjust
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;
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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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// 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); // create the fontfill background
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this._drawText(ctx, selected, hover, x, y, baseline);
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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 lineMargin = 2;
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if (this.isEdgeLabel) {
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switch (this.fontOptions.align) {
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case 'middle':
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ctx.fillRect(-this.size.width * 0.5, -this.size.height * 0.5, this.size.width, this.size.height);
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break;
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case 'top':
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ctx.fillRect(-this.size.width * 0.5, -(this.size.height + lineMargin), this.size.width, this.size.height);
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break;
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case 'bottom':
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ctx.fillRect(-this.size.width * 0.5, lineMargin, this.size.width, this.size.height);
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break;
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default:
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ctx.fillRect(this.size.left, this.size.top - 0.5*lineMargin, this.size.width, this.size.height);
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break;
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}
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} else {
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ctx.fillRect(this.size.left, this.size.top - 0.5*lineMargin, this.size.width, this.size.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 {boolean} selected
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* @param {boolean} hover
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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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* @private
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*/
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_drawText(ctx, selected, hover, x, y, baseline = 'middle') {
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let fontSize = this.fontOptions.size;
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let viewFontSize = fontSize * this.body.view.scale;
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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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// TODO: Does this actually do anything?
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fontSize = Number(this.elementOptions.scaling.label.maxVisible) / this.body.view.scale;
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}
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let yLine = this.size.yLine;
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[x, yLine] = this._setAlignment(ctx, x, yLine, 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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yLine -= (this.size.height - this.size.labelHeight) / 2;
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}
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if (this.fontOptions.valign === 'bottom') {
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yLine += (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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if (this.lines[i] && this.lines[i].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 - this.lines[i].width) / 2
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} else if (this.fontOptions.align === 'right') {
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width += (this.size.width - this.lines[i].width)
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}
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for (let j = 0; j < this.lines[i].blocks.length; j++) {
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let block = this.lines[i].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, yLine + block.vadjust);
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}
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ctx.fillText(block.text, x + width, yLine + block.vadjust);
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width += block.width;
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}
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yLine += this.lines[i].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} yLine
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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, yLine, baseline) {
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// check for label alignment (for edges)
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// TODO: make alignment for nodes
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if (this.isEdgeLabel && this.fontOptions.align !== 'horizontal' && this.pointToSelf === false) {
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x = 0;
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yLine = 0;
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let lineMargin = 2;
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if (this.fontOptions.align === 'top') {
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ctx.textBaseline = 'alphabetic';
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yLine -= 2 * lineMargin; // distance from edge, required because we use alphabetic. Alphabetic has less difference between browsers
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}
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else if (this.fontOptions.align === 'bottom') {
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ctx.textBaseline = 'hanging';
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yLine += 2 * lineMargin;// distance from edge, required because we use hanging. Hanging has less difference between browsers
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}
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else {
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ctx.textBaseline = 'middle';
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}
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}
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else {
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ctx.textBaseline = baseline;
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}
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return [x,yLine];
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}
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/**
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* fade in when relative scale is between threshold and threshold - 1.
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* If the relative scale would be smaller than threshold -1 the draw function would have returned before coming here.
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*
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* @param {string} color The font color to use
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* @param {number} viewFontSize
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* @param {string} initialStrokeColor
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* @returns {Array.<string>} An array containing the font color and stroke color
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* @private
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*/
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_getColor(color, viewFontSize, initialStrokeColor) {
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let fontColor = color || '#000000';
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let strokeColor = initialStrokeColor || '#ffffff';
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if (viewFontSize <= this.elementOptions.scaling.label.drawThreshold) {
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let opacity = Math.max(0, Math.min(1, 1 - (this.elementOptions.scaling.label.drawThreshold - viewFontSize)));
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fontColor = util.overrideOpacity(fontColor, opacity);
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strokeColor = util.overrideOpacity(strokeColor, opacity);
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}
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return [fontColor, strokeColor];
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}
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/**
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*
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* @param {CanvasRenderingContext2D} ctx
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* @param {boolean} selected
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* @param {boolean} hover
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* @returns {{width: number, height: number}}
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*/
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getTextSize(ctx, selected = false, hover = false) {
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this._processLabel(ctx, selected, hover);
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return {
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width: this.size.width,
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height: this.size.height,
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lineCount: this.lineCount
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|
};
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|
}
|
|
|
|
|
|
/**
|
|
*
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @param {boolean} selected
|
|
* @param {boolean} hover
|
|
* @param {number} [x=0]
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|
* @param {number} [y=0]
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|
* @param {'middle'|'hanging'} [baseline='middle']
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|
*/
|
|
calculateLabelSize(ctx, selected, hover, x = 0, y = 0, baseline = 'middle') {
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|
if (this.labelDirty === true) {
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|
this._processLabel(ctx, selected, hover);
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|
}
|
|
this.size.left = x - this.size.width * 0.5;
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|
this.size.top = y - this.size.height * 0.5;
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|
this.size.yLine = y + (1 - this.lineCount) * 0.5 * this.fontOptions.size;
|
|
if (baseline === "hanging") {
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|
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
|
|
}
|
|
this.labelDirty = false;
|
|
}
|
|
|
|
|
|
/**
|
|
*
|
|
* @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) {
|
|
var getValue = function(fontOptions, mod, option) {
|
|
if (mod === "normal") {
|
|
if (option === 'mod' ) return "";
|
|
return fontOptions[option];
|
|
}
|
|
|
|
if (fontOptions[mod][option]) {
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
ctx.font = (values.mod + " " + values.size + "px " + values.face).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.fontOptions.selectedState) && (hover !== this.fontOptions.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) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
export default Label;
|