Qt: Add clear bindings button to controllers

pcsx2-qt/Settings/ControllerBindingWidget.ui

@@ -83,6 +83,16 @@
           </property>
          </widget>
         </item>
+        <item>
+         <widget class="QPushButton" name="clearBindings">
+          <property name="text">
+           <string>Clear Bindings</string>
+          </property>
+          <property name="icon">
+           <iconset theme="file-reduce-line"/>
+          </property>
+         </widget>
+        </item>
        </layout>
       </item>
      </layout>

pcsx2-qt/Settings/ControllerBindingWidgets.cpp

@@ -45,6 +45,7 @@ ControllerBindingWidget::ControllerBindingWidget(QWidget* parent, ControllerSett
 	SettingWidgetBinder::BindWidgetToStringSetting(nullptr, m_ui.controllerType, m_config_section, "Type", "None");
 	connect(m_ui.controllerType, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &ControllerBindingWidget::onTypeChanged);
 	connect(m_ui.automaticBinding, &QPushButton::clicked, this, &ControllerBindingWidget::doAutomaticBinding);
+	connect(m_ui.clearBindings, &QPushButton::clicked, this, &ControllerBindingWidget::doClearBindings);
 }
 
 ControllerBindingWidget::~ControllerBindingWidget() = default;
@@ -107,6 +108,22 @@ void ControllerBindingWidget::doAutomaticBinding()
 	menu.exec(QCursor::pos());
 }
 
+void ControllerBindingWidget::doClearBindings()
+{
+	if (QMessageBox::question(QtUtils::GetRootWidget(this), tr("Clear Bindings"),
+		tr("Are you sure you want to clear all bindings for this controller? This action cannot be undone.")) != QMessageBox::Yes)
+	{
+		return;
+	}
+
+	{
+		auto lock = Host::GetSettingsLock();
+		PAD::ClearPortBindings(*Host::Internal::GetBaseSettingsLayer(), m_port_number);
+	}
+
+	saveAndRefresh();
+}
+
 void ControllerBindingWidget::doDeviceAutomaticBinding(const QString& device)
 {
 	std::vector<std::pair<GenericInputBinding, std::string>> mapping = InputManager::GetGenericBindingMapping(device.toStdString());
@@ -123,13 +140,16 @@ void ControllerBindingWidget::doDeviceAutomaticBinding(const QString& device)
 		result = PAD::MapController(*Host::Internal::GetBaseSettingsLayer(), m_port_number, mapping);
 	}
 
+	// force a refresh after mapping
 	if (result)
-	{
-		// force a refresh after mapping
-		onTypeChanged();
-		QtHost::QueueSettingsSave();
-		g_emu_thread->applySettings();
-	}
+		saveAndRefresh();
+}
+
+void ControllerBindingWidget::saveAndRefresh()
+{
+	onTypeChanged();
+	QtHost::QueueSettingsSave();
+	g_emu_thread->applySettings();
 }
 
 //////////////////////////////////////////////////////////////////////////

pcsx2-qt/Settings/ControllerBindingWidgets.h

@@ -40,10 +40,12 @@ public:
 private Q_SLOTS:
 	void onTypeChanged();
 	void doAutomaticBinding();
+	void doClearBindings();
 
 private:
 	void populateControllerTypes();
 	void doDeviceAutomaticBinding(const QString& device);
+	void saveAndRefresh();
 
 	Ui::ControllerBindingWidget m_ui;
 

pcsx2/PAD/Host/PAD.cpp

@@ -342,6 +342,19 @@ std::vector<std::string> PAD::GetControllerBinds(const std::string_view& type)
 	return ret;
 }
 
+void PAD::ClearPortBindings(SettingsInterface& si, u32 port)
+{
+	const std::string section(StringUtil::StdStringFromFormat("Pad%u", port + 1));
+	const std::string type(si.GetStringValue(section.c_str(), "Type", GetDefaultPadType(port)));
+
+	const ControllerInfo* info = GetControllerInfo(type);
+	if (!info)
+		return;
+
+	for (u32 i = 0; i < info->num_bindings; i++)
+		si.DeleteValue(section.c_str(), info->bindings[i].name);
+}
+
 PAD::VibrationCapabilities PAD::GetControllerVibrationCapabilities(const std::string_view& type)
 {
 	const ControllerInfo* info = GetControllerInfo(type);

pcsx2/PAD/Host/PAD.h

@@ -54,6 +54,9 @@ namespace PAD
 	/// Restores default configuration.
 	void SetDefaultConfig(SettingsInterface& si);
 
+	/// Clears all bindings for a given port.
+	void ClearPortBindings(SettingsInterface& si, u32 port);
+
 	/// Updates vibration and other internal state. Called at the *end* of a frame.
 	void Update();