Moved generating preview text from HistoryWidget to WebPageData.

Telegram/CMakeLists.txt

@@ -604,6 +604,8 @@ PRIVATE
     history/view/history_view_service_message.h
     history/view/history_view_top_bar_widget.cpp
     history/view/history_view_top_bar_widget.h
+    history/view/history_view_webpage_preview.cpp
+    history/view/history_view_webpage_preview.h
     history/history.cpp
     history/history.h
     history/history_drag_area.cpp

Telegram/SourceFiles/history/history_widget.cpp

@@ -59,6 +59,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_element.h"
 #include "history/view/history_view_scheduled_section.h"
 #include "history/view/history_view_schedule_box.h"
+#include "history/view/history_view_webpage_preview.h"
 #include "history/view/media/history_view_media.h"
 #include "profile/profile_block_group_members.h"
 #include "info/info_memento.h"
@@ -5965,38 +5966,22 @@ void HistoryWidget::updatePreview() {
 			const auto timeout = (_previewData->pendingTill - base::unixtime::now());
 			_previewTimer.callOnce(std::max(timeout, 0) * crl::time(1000));
 		} else {
-			QString title, desc;
+			auto preview =
-			if (_previewData->siteName.isEmpty()) {
+				HistoryView::TitleAndDescriptionFromWebPage(_previewData);
-				if (_previewData->title.isEmpty()) {
+			if (preview.title.isEmpty()) {
-					if (_previewData->description.text.isEmpty()) {
-						title = _previewData->author;
-						desc = ((_previewData->document && !_previewData->document->filename().isEmpty()) ? _previewData->document->filename() : _previewData->url);
-					} else {
-						title = _previewData->description.text;
-						desc = _previewData->author.isEmpty() ? ((_previewData->document && !_previewData->document->filename().isEmpty()) ? _previewData->document->filename() : _previewData->url) : _previewData->author;
-					}
-				} else {
-					title = _previewData->title;
-					desc = _previewData->description.text.isEmpty() ? (_previewData->author.isEmpty() ? ((_previewData->document && !_previewData->document->filename().isEmpty()) ? _previewData->document->filename() : _previewData->url) : _previewData->author) : _previewData->description.text;
-				}
-			} else {
-				title = _previewData->siteName;
-				desc = _previewData->title.isEmpty() ? (_previewData->description.text.isEmpty() ? (_previewData->author.isEmpty() ? ((_previewData->document && !_previewData->document->filename().isEmpty()) ? _previewData->document->filename() : _previewData->url) : _previewData->author) : _previewData->description.text) : _previewData->title;
-			}
-			if (title.isEmpty()) {
 				if (_previewData->document) {
-					title = tr::lng_attach_file(tr::now);
+					preview.title = tr::lng_attach_file(tr::now);
 				} else if (_previewData->photo) {
-					title = tr::lng_attach_photo(tr::now);
+					preview.title = tr::lng_attach_photo(tr::now);
 				}
 			}
 			_previewTitle.setText(
 				st::msgNameStyle,
-				title,
+				preview.title,
 				Ui::NameTextOptions());
 			_previewDescription.setText(
 				st::messageTextStyle,
-				TextUtilities::Clean(desc),
+				TextUtilities::Clean(preview.description),
 				Ui::DialogTextOptions());
 		}
 	} else if (!readyToForward() && !replyToId() && !_editMsgId) {

Telegram/SourceFiles/history/view/history_view_webpage_preview.cpp

@@ -0,0 +1,59 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "history/view/history_view_webpage_preview.h"
+
+#include "data/data_web_page.h"
+
+namespace HistoryView {
+
+WebPageText TitleAndDescriptionFromWebPage(not_null<WebPageData*> d) {
+	QString resultTitle, resultDescription;
+	const auto document = d->document;
+	const auto photo = d->photo;
+	const auto author = d->author;
+	const auto siteName = d->siteName;
+	const auto title = d->title;
+	const auto description = d->description;
+	const auto filenameOrUrl = [&] {
+		return ((document && !document->filename().isEmpty())
+			? document->filename()
+			: d->url);
+	};
+	const auto authorOrFilename = [&] {
+		return (author.isEmpty()
+			? filenameOrUrl()
+			: author);
+	};
+	const auto descriptionOrAuthor = [&] {
+		return (description.text.isEmpty()
+			? authorOrFilename()
+			: description.text);
+	};
+	if (siteName.isEmpty()) {
+		if (title.isEmpty()) {
+			if (description.text.isEmpty()) {
+				resultTitle = author;
+				resultDescription = filenameOrUrl();
+			} else {
+				resultTitle = description.text;
+				resultDescription = authorOrFilename();
+			}
+		} else {
+			resultTitle = title;
+			resultDescription = descriptionOrAuthor();
+		}
+	} else {
+		resultTitle = siteName;
+		resultDescription = title.isEmpty()
+			? descriptionOrAuthor()
+			: title;
+	}
+	return { resultTitle, resultDescription };
+}
+
+} // namespace HistoryView

Telegram/SourceFiles/history/view/history_view_webpage_preview.h

@@ -0,0 +1,19 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+namespace HistoryView {
+
+struct WebPageText {
+	QString title;
+	QString description;
+};
+
+WebPageText TitleAndDescriptionFromWebPage(not_null<WebPageData*> d);
+
+} // namespace HistoryView