calendar: Copy URLHighlighter and friends here

We will start using both URLHighlighter and the _fixMarkup() helper
method the same way it's used in MessageTray. Usually we should
make fixMarkup() public and call the existing methods, but we are
planning for them to go away soon, so just keep two copies until
the original one is removed.

https://bugzilla.gnome.org/show_bug.cgi?id=744817

js/ui/calendar.js

@@ -9,8 +9,11 @@ const Signals = imports.signals;
 const Pango = imports.gi.Pango;
 const Gettext_gtk30 = imports.gettext.domain('gtk30');
 const Mainloop = imports.mainloop;
+const Meta = imports.gi.Meta;
 const Shell = imports.gi.Shell;
 
+const Util = imports.misc.util;
+
 const MSECS_IN_DAY = 24 * 60 * 60 * 1000;
 const SHOW_WEEKDATE_KEY = 'show-weekdate';
 const ELLIPSIS_CHAR = '\u2026';
@@ -137,6 +140,147 @@ function _getEventDayAbbreviation(dayNumber) {
     return abbreviations[dayNumber];
 }
 
+function _fixMarkup(text, allowMarkup) {
+    if (allowMarkup) {
+        // Support &, ", ', < and >, escape all other
+        // occurrences of '&'.
+        let _text = text.replace(/&(?!amp;|quot;|apos;|lt;|gt;)/g, '&');
+
+        // Support <b>, <i>, and <u>, escape anything else
+        // so it displays as raw markup.
+        _text = _text.replace(/<(?!\/?[biu]>)/g, '&lt;');
+
+        try {
+            Pango.parse_markup(_text, -1, '');
+            return _text;
+        } catch (e) {}
+    }
+
+    // !allowMarkup, or invalid markup
+    return GLib.markup_escape_text(text, -1);
+}
+
+const URLHighlighter = new Lang.Class({
+    Name: 'URLHighlighter',
+
+    _init: function(text, lineWrap, allowMarkup) {
+        if (!text)
+            text = '';
+        this.actor = new St.Label({ reactive: true, style_class: 'url-highlighter' });
+        this._linkColor = '#ccccff';
+        this.actor.connect('style-changed', Lang.bind(this, function() {
+            let [hasColor, color] = this.actor.get_theme_node().lookup_color('link-color', false);
+            if (hasColor) {
+                let linkColor = color.to_string().substr(0, 7);
+                if (linkColor != this._linkColor) {
+                    this._linkColor = linkColor;
+                    this._highlightUrls();
+                }
+            }
+        }));
+        this.actor.clutter_text.line_wrap = lineWrap;
+        this.actor.clutter_text.line_wrap_mode = Pango.WrapMode.WORD_CHAR;
+
+        this.setMarkup(text, allowMarkup);
+        this.actor.connect('button-press-event', Lang.bind(this, function(actor, event) {
+            // Don't try to URL highlight when invisible.
+            // The MessageTray doesn't actually hide us, so
+            // we need to check for paint opacities as well.
+            if (!actor.visible || actor.get_paint_opacity() == 0)
+                return Clutter.EVENT_PROPAGATE;
+
+            // Keep Notification.actor from seeing this and taking
+            // a pointer grab, which would block our button-release-event
+            // handler, if an URL is clicked
+            return this._findUrlAtPos(event) != -1;
+        }));
+        this.actor.connect('button-release-event', Lang.bind(this, function (actor, event) {
+            if (!actor.visible || actor.get_paint_opacity() == 0)
+                return Clutter.EVENT_PROPAGATE;
+
+            let urlId = this._findUrlAtPos(event);
+            if (urlId != -1) {
+                let url = this._urls[urlId].url;
+                if (url.indexOf(':') == -1)
+                    url = 'http://' + url;
+
+                Gio.app_info_launch_default_for_uri(url, global.create_app_launch_context(0, -1));
+                return Clutter.EVENT_STOP;
+            }
+            return Clutter.EVENT_PROPAGATE;
+        }));
+        this.actor.connect('motion-event', Lang.bind(this, function(actor, event) {
+            if (!actor.visible || actor.get_paint_opacity() == 0)
+                return Clutter.EVENT_PROPAGATE;
+
+            let urlId = this._findUrlAtPos(event);
+            if (urlId != -1 && !this._cursorChanged) {
+                global.screen.set_cursor(Meta.Cursor.POINTING_HAND);
+                this._cursorChanged = true;
+            } else if (urlId == -1) {
+                global.screen.set_cursor(Meta.Cursor.DEFAULT);
+                this._cursorChanged = false;
+            }
+            return Clutter.EVENT_PROPAGATE;
+        }));
+        this.actor.connect('leave-event', Lang.bind(this, function() {
+            if (!this.actor.visible || this.actor.get_paint_opacity() == 0)
+                return Clutter.EVENT_PROPAGATE;
+
+            if (this._cursorChanged) {
+                this._cursorChanged = false;
+                global.screen.set_cursor(Meta.Cursor.DEFAULT);
+            }
+            return Clutter.EVENT_PROPAGATE;
+        }));
+    },
+
+    setMarkup: function(text, allowMarkup) {
+        text = text ? _fixMarkup(text, allowMarkup) : '';
+        this._text = text;
+
+        this.actor.clutter_text.set_markup(text);
+        /* clutter_text.text contain text without markup */
+        this._urls = Util.findUrls(this.actor.clutter_text.text);
+        this._highlightUrls();
+    },
+
+    _highlightUrls: function() {
+        // text here contain markup
+        let urls = Util.findUrls(this._text);
+        let markup = '';
+        let pos = 0;
+        for (let i = 0; i < urls.length; i++) {
+            let url = urls[i];
+            let str = this._text.substr(pos, url.pos - pos);
+            markup += str + '<span foreground="' + this._linkColor + '"><u>' + url.url + '</u></span>';
+            pos = url.pos + url.url.length;
+        }
+        markup += this._text.substr(pos);
+        this.actor.clutter_text.set_markup(markup);
+    },
+
+    _findUrlAtPos: function(event) {
+        let success;
+        let [x, y] = event.get_coords();
+        [success, x, y] = this.actor.transform_stage_point(x, y);
+        let find_pos = -1;
+        for (let i = 0; i < this.actor.clutter_text.text.length; i++) {
+            let [success, px, py, line_height] = this.actor.clutter_text.position_to_coords(i);
+            if (py > y || py + line_height < y || x < px)
+                continue;
+            find_pos = i;
+        }
+        if (find_pos != -1) {
+            for (let i = 0; i < this._urls.length; i++)
+            if (find_pos >= this._urls[i].pos &&
+                this._urls[i].pos + this._urls[i].url.length > find_pos)
+                return i;
+        }
+        return -1;
+    }
+});
+
 // Abstraction for an appointment/event in a calendar
 
 const CalendarEvent = new Lang.Class({