Qtfred custom data scripting parity (#7396)

* mirror scripting behavior from fred2

* apply scripted default custom data on new mission
# Conflicts:
#	qtfred/src/mission/dialogs/MissionSpecDialogModel.cpp
#	qtfred/src/ui/dialogs/MissionSpecs/CustomDataDialog.cpp

Author: MjnMixael

qtfred/src/mission/Editor.cpp

@@ -11,6 +11,7 @@
 #include <parse/parselo.h>
 #include <missionui/fictionviewer.h>
 #include <mission/missiongoals.h>
+#include <mission/missionparse.h>
 #include <asteroid/asteroid.h>
 #include <jumpnode/jumpnode.h>
 #include <prop/prop.h>
@@ -609,6 +610,7 @@ void Editor::clearMission(bool fast_reload) {
 	strcpy_s(The_mission.modified, The_mission.created);
 	strcpy_s(The_mission.notes, "This is a FRED2_OPEN created mission.");
 	strcpy_s(The_mission.mission_desc, "Put mission description here");
+	apply_default_custom_data(&The_mission);
 
 	// reset alternate name & callsign stuff
 	for (auto i = 0; i < MAX_SHIPS; i++) {

qtfred/src/mission/dialogs/MissionSpecDialogModel.cpp

@@ -14,6 +14,7 @@
 #include "localization/localize.h"
 #include "mission/missionmessage.h"
 #include "mission/mission_flags.h"
+#include "scripting/global_hooks.h"
 
 #include <QtWidgets>
 
@@ -202,6 +203,11 @@ bool MissionSpecDialogModel::apply() {
 
 	Editor::update_custom_wing_indexes();
 
+	// scripts may rebuild LuaEnums when custom data/strings change.
+	if (scripting::hooks::FredOnMissionSpecsSave->isActive()) {
+		scripting::hooks::FredOnMissionSpecsSave->run();
+	}
+
 	return true;
 }
 

qtfred/src/ui/dialogs/MissionSpecs/CustomDataDialog.cpp

@@ -1,6 +1,7 @@
 #include "CustomDataDialog.h"
 #include "ui_CustomDataDialog.h"
 
+#include "mission/missionparse.h"
 #include "mission/util.h"
 
 #include <ui/util/SignalBlockers.h>
@@ -104,7 +105,7 @@ void CustomDataDialog::buildView()
 	auto* hdr = ui->stringsTableView->horizontalHeader();
 	hdr->setSectionsClickable(false);  // no click/press behavior
 	hdr->setSortIndicatorShown(false); // hide sort arrow
-	hdr->setHighlightSections(false);  // don’t change look when selected
+	hdr->setHighlightSections(false);  // don't change look when selected
 	hdr->setSectionsMovable(false);    // no drag-to-reorder columns
 	hdr->setFocusPolicy(Qt::NoFocus);
 
@@ -158,8 +159,23 @@ void CustomDataDialog::loadRowIntoEditors(int row)
 
 	const auto* keyItem = _tableModel->item(row, ColKey);
 	const auto* valItem = _tableModel->item(row, ColValue);
-	ui->keyLineEdit->setText(keyItem ? keyItem->text() : QString());
+	const auto key = keyItem ? keyItem->text() : QString();
+	ui->keyLineEdit->setText(key);
 	ui->valueLineEdit->setText(valItem ? valItem->text() : QString());
+	updateHelpTextForKey(key);
+}
+
+void CustomDataDialog::updateHelpTextForKey(const QString& key)
+{
+	auto helpText = tr("No help text provided");
+	for (const auto& entry : Default_custom_data) {
+		if (key == QString::fromStdString(entry.key)) {
+			helpText = QString::fromStdString(entry.description);
+			break;
+		}
+	}
+
+	ui->helpTextBrowser->setPlainText(helpText);
 }
 
 std::pair<SCP_string, SCP_string> CustomDataDialog::editorsToEntry() const
@@ -176,6 +192,7 @@ void CustomDataDialog::clearEditors()
 
 	ui->keyLineEdit->clear();
 	ui->valueLineEdit->clear();
+	ui->helpTextBrowser->setPlainText("");
 }
 
 void CustomDataDialog::on_addButton_clicked()

qtfred/src/ui/dialogs/MissionSpecs/CustomDataDialog.h

@@ -47,6 +47,7 @@ class CustomDataDialog final : public QDialog {
 	void refreshTable();
 	void selectRow(int row);
 	void loadRowIntoEditors(int row);
+	void updateHelpTextForKey(const QString& key);
 	std::pair<SCP_string, SCP_string> editorsToEntry() const;
 	void clearEditors();
 

qtfred/ui/CustomDataDialog.ui

@@ -116,6 +116,20 @@
          </property>
         </spacer>
        </item>
+       <item>
+        <widget class="QLabel" name="helpLabel">
+         <property name="text">
+          <string>Description</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QPlainTextEdit" name="helpTextBrowser">
+         <property name="readOnly">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
       </layout>
      </item>
      <item>