Added ability to copy monospace text via click.

Telegram/Resources/langs/lang.strings

@@ -1972,6 +1972,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_formatting_link_url" = "URL";
 "lng_formatting_link_create" = "Create";
 
+"lng_text_copied" = "Text copied to clipboard.";
+
 "lng_spellchecker_submenu" = "Spelling";
 "lng_spellchecker_add" = "Add to Dictionary";
 "lng_spellchecker_remove" = "Remove from Dictionary";

Telegram/SourceFiles/core/click_handler_types.cpp

@@ -14,6 +14,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "mainwindow.h"
 #include "main/main_session.h"
 #include "ui/boxes/confirm_box.h"
+#include "ui/text/text_entity.h"
+#include "ui/toast/toast.h"
 #include "base/qthelp_regex.h"
 #include "storage/storage_account.h"
 #include "history/history.h"
@@ -266,3 +268,41 @@ void BotCommandClickHandler::onClick(ClickContext context) const {
 auto BotCommandClickHandler::getTextEntity() const -> TextEntity {
 	return { EntityType::BotCommand };
 }
+
+MonospaceClickHandler::MonospaceClickHandler(
+	const QString &text,
+	EntityType type)
+: _text(text)
+, _entity({ type }) {
+}
+
+void MonospaceClickHandler::onClick(ClickContext context) const {
+	const auto button = context.button;
+	if (button != Qt::LeftButton && button != Qt::MiddleButton) {
+		return;
+	}
+	const auto my = context.other.value<ClickHandlerContext>();
+	if (const auto controller = my.sessionWindow.get()) {
+		auto &data = controller->session().data();
+		const auto item = data.message(my.itemId);
+		const auto hasCopyRestriction = item
+			&& (!item->history()->peer->allowsForwarding()
+				|| item->forbidsForward());
+		if (hasCopyRestriction) {
+			Ui::Toast::Show(item->history()->peer->isBroadcast()
+				? tr::lng_error_nocopy_channel(tr::now)
+				: tr::lng_error_nocopy_group(tr::now));
+			return;
+		}
+	}
+	Ui::Toast::Show(tr::lng_text_copied(tr::now));
+	TextUtilities::SetClipboardText(TextForMimeData::Simple(_text.trimmed()));
+}
+
+auto MonospaceClickHandler::getTextEntity() const -> TextEntity {
+	return _entity;
+}
+
+QString MonospaceClickHandler::url() const {
+	return _text;
+}

Telegram/SourceFiles/core/click_handler_types.h

@@ -195,3 +195,20 @@ private:
 	QString _cmd;
 
 };
+
+class MonospaceClickHandler : public TextClickHandler {
+public:
+	MonospaceClickHandler(const QString &text, EntityType type);
+
+	void onClick(ClickContext context) const override;
+
+	TextEntity getTextEntity() const override;
+
+protected:
+	QString url() const override;
+
+private:
+	const QString _text;
+	const TextEntity _entity;
+
+};

Telegram/SourceFiles/core/ui_integration.cpp

@@ -202,6 +202,11 @@ std::shared_ptr<ClickHandler> UiIntegration::createLinkHandler(
 			LOG(("Bad mention name: %1").arg(data.data));
 		}
 	} break;
+
+	case EntityType::Code:
+		return std::make_shared<MonospaceClickHandler>(data.text, data.type);
+	case EntityType::Pre:
+		return std::make_shared<MonospaceClickHandler>(data.text, data.type);
 	}
 	return Integration::createLinkHandler(data, context);
 }