input: Allow disabling touchscreen input (#4517)

* enable/disable touch device

* ConfigManager: update documentation of 'enabled'

Author: earboxer

src/config/ConfigManager.cpp

@@ -255,6 +255,7 @@ void CConfigManager::setDefaultVars() {
     configValues["input:touchpad:scroll_factor"].floatValue         = 1.f;
     configValues["input:touchdevice:transform"].intValue            = 0;
     configValues["input:touchdevice:output"].strValue               = STRVAL_EMPTY;
+    configValues["input:touchdevice:enabled"].intValue              = 1;
     configValues["input:tablet:transform"].intValue                 = 0;
     configValues["input:tablet:output"].strValue                    = STRVAL_EMPTY;
     configValues["input:tablet:region_position"].vecValue           = Vector2D();
@@ -320,7 +321,7 @@ void CConfigManager::setDeviceDefaultVars(const std::string& dev) {
     cfgValues["scroll_points"].strValue           = STRVAL_EMPTY;
     cfgValues["transform"].intValue               = 0;
     cfgValues["output"].strValue                  = STRVAL_EMPTY;
-    cfgValues["enabled"].intValue                 = 1;          // only for mice / touchpads
+    cfgValues["enabled"].intValue                 = 1;          // only for mice, touchpads, and touchdevices
     cfgValues["region_position"].vecValue         = Vector2D(); // only for tablets
     cfgValues["region_size"].vecValue             = Vector2D(); // only for tablets
     cfgValues["relative_input"].intValue          = 0;          // only for tablets

src/managers/input/InputManager.cpp

@@ -1460,12 +1460,16 @@ void CInputManager::newTouchDevice(wlr_input_device* pDevice) {
 }
 
 void CInputManager::setTouchDeviceConfigs(STouchDevice* dev) {
-
     auto setConfig = [&](STouchDevice* const PTOUCHDEV) -> void {
         if (wlr_input_device_is_libinput(PTOUCHDEV->pWlrDevice)) {
             const auto LIBINPUTDEV = (libinput_device*)wlr_libinput_get_device_handle(PTOUCHDEV->pWlrDevice);
 
-            const int  ROTATION = std::clamp(g_pConfigManager->getDeviceInt(PTOUCHDEV->name, "transform", "input:touchdevice:transform"), 0, 7);
+            const auto ENABLED = g_pConfigManager->getDeviceInt(PTOUCHDEV->name, "enabled", "input:touchdevice:enabled");
+            const auto mode    = ENABLED ? LIBINPUT_CONFIG_SEND_EVENTS_ENABLED : LIBINPUT_CONFIG_SEND_EVENTS_DISABLED;
+            if (libinput_device_config_send_events_get_mode(LIBINPUTDEV) != mode)
+                libinput_device_config_send_events_set_mode(LIBINPUTDEV, mode);
+
+            const int ROTATION = std::clamp(g_pConfigManager->getDeviceInt(PTOUCHDEV->name, "transform", "input:touchdevice:transform"), 0, 7);
             if (libinput_device_config_calibration_has_matrix(LIBINPUTDEV))
                 libinput_device_config_calibration_set_matrix(LIBINPUTDEV, MATRICES[ROTATION]);