Add support for pasting clipboard text

app/app.pro

@@ -134,6 +134,7 @@ SOURCES += \
     settings/mappingfetcher.cpp \
     settings/streamingpreferences.cpp \
     streaming/input/abstouch.cpp \
+    streaming/input/clipboard.cpp \
     streaming/input/gamepad.cpp \
     streaming/input/input.cpp \
     streaming/input/keyboard.cpp \

app/streaming/input/clipboard.cpp

@@ -0,0 +1,101 @@
+#include "input.h"
+
+#define MAP_KEY(c, sc) \
+    case c: \
+        event.key.keysym.scancode = sc; \
+        break
+
+#define MAP_KEY_SHIFT(c, sc) \
+    case c: \
+        event.key.keysym.scancode = sc; \
+        event.key.keysym.mod = KMOD_SHIFT; \
+        break
+
+void SdlInputHandler::sendText(const char* text)
+{
+    for (const char* c = text; *c != 0; c++) {
+        SDL_Event event = {};
+
+        if (*c >= 'A' && *c <= 'Z') {
+            event.key.keysym.scancode = (SDL_Scancode)((*c - 'A') + SDL_SCANCODE_A);
+            event.key.keysym.mod = KMOD_SHIFT;
+        }
+        else if (*c >= 'a' && *c <= 'z') {
+            event.key.keysym.scancode = (SDL_Scancode)((*c - 'a') + SDL_SCANCODE_A);
+        }
+        else if (*c >= '1' && *c <= '9') {
+            event.key.keysym.scancode = (SDL_Scancode)((*c - '1') + SDL_SCANCODE_1);
+        }
+        else {
+            // TODO: Smartquotes
+            switch (*c) {
+
+            // Handle CRLF separately to avoid duplicate newlines
+            case '\r':
+                if (*(c + 1) == '\n') {
+                    c++;
+                }
+                event.key.keysym.scancode = SDL_SCANCODE_RETURN;
+                break;
+
+            MAP_KEY('\b', SDL_SCANCODE_BACKSPACE);
+            MAP_KEY('\n', SDL_SCANCODE_RETURN);
+            MAP_KEY('\t', SDL_SCANCODE_TAB);
+
+            MAP_KEY(' ', SDL_SCANCODE_SPACE);
+            MAP_KEY_SHIFT('!', SDL_SCANCODE_1);
+            MAP_KEY_SHIFT('"', SDL_SCANCODE_APOSTROPHE);
+            MAP_KEY_SHIFT('#', SDL_SCANCODE_3);
+            MAP_KEY_SHIFT('$', SDL_SCANCODE_4);
+            MAP_KEY_SHIFT('%', SDL_SCANCODE_5);
+            MAP_KEY_SHIFT('&', SDL_SCANCODE_7);
+            MAP_KEY('\'', SDL_SCANCODE_APOSTROPHE);
+            MAP_KEY_SHIFT('(', SDL_SCANCODE_9);
+            MAP_KEY_SHIFT(')', SDL_SCANCODE_0);
+            MAP_KEY_SHIFT('*', SDL_SCANCODE_8);
+            MAP_KEY_SHIFT('+', SDL_SCANCODE_EQUALS);
+            MAP_KEY(',', SDL_SCANCODE_COMMA);
+            MAP_KEY('-', SDL_SCANCODE_MINUS);
+            MAP_KEY('.', SDL_SCANCODE_PERIOD);
+            MAP_KEY('/', SDL_SCANCODE_SLASH);
+            MAP_KEY('0', SDL_SCANCODE_0);
+
+            MAP_KEY_SHIFT(':', SDL_SCANCODE_SEMICOLON);
+            MAP_KEY(';', SDL_SCANCODE_SEMICOLON);
+            MAP_KEY_SHIFT('<', SDL_SCANCODE_COMMA);
+            MAP_KEY('=', SDL_SCANCODE_EQUALS);
+            MAP_KEY_SHIFT('>', SDL_SCANCODE_PERIOD);
+            MAP_KEY_SHIFT('?', SDL_SCANCODE_SLASH);
+            MAP_KEY_SHIFT('@', SDL_SCANCODE_2);
+
+            MAP_KEY('[', SDL_SCANCODE_LEFTBRACKET);
+            MAP_KEY('\\', SDL_SCANCODE_BACKSLASH);
+            MAP_KEY(']', SDL_SCANCODE_RIGHTBRACKET);
+            MAP_KEY_SHIFT('^', SDL_SCANCODE_6);
+            MAP_KEY_SHIFT('_', SDL_SCANCODE_MINUS);
+            MAP_KEY('`', SDL_SCANCODE_GRAVE);
+
+            MAP_KEY_SHIFT('{', SDL_SCANCODE_LEFTBRACKET);
+            MAP_KEY_SHIFT('|', SDL_SCANCODE_BACKSLASH);
+            MAP_KEY_SHIFT('}', SDL_SCANCODE_RIGHTBRACKET);
+            MAP_KEY_SHIFT('~', SDL_SCANCODE_GRAVE);
+
+            default:
+                SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                            "Pasting text - non-ASCII character '%c' ignored",
+                            *c);
+                continue;
+            }
+        }
+
+        event.type = SDL_KEYDOWN;
+        event.key.state = SDL_PRESSED;
+        handleKeyEvent(&event.key);
+
+        SDL_Delay(10);
+
+        event.type = SDL_KEYUP;
+        event.key.state = SDL_RELEASED;
+        handleKeyEvent(&event.key);
+    }
+}

app/streaming/input/input.cpp

@@ -109,6 +109,11 @@ SdlInputHandler::SdlInputHandler(StreamingPreferences& prefs, NvComputer*, int s
     m_SpecialKeyCombos[KeyComboToggleMinimize].scanCode = SDL_SCANCODE_D;
     m_SpecialKeyCombos[KeyComboToggleMinimize].enabled = QGuiApplication::platformName() != "eglfs";
 
+    m_SpecialKeyCombos[KeyComboPasteText].keyCombo = KeyComboPasteText;
+    m_SpecialKeyCombos[KeyComboPasteText].keyCode = SDLK_v;
+    m_SpecialKeyCombos[KeyComboPasteText].scanCode = SDL_SCANCODE_V;
+    m_SpecialKeyCombos[KeyComboPasteText].enabled = true;
+
     m_OldIgnoreDevices = SDL_GetHint(SDL_HINT_GAMECONTROLLER_IGNORE_DEVICES);
     m_OldIgnoreDevicesExcept = SDL_GetHint(SDL_HINT_GAMECONTROLLER_IGNORE_DEVICES_EXCEPT);
 

app/streaming/input/input.h

@@ -65,6 +65,8 @@ public:
 
     void handleJoystickArrivalEvent(SDL_JoyDeviceEvent* event);
 
+    void sendText(const char* text);
+
     void rumble(unsigned short controllerNumber, unsigned short lowFreqMotor, unsigned short highFreqMotor);
 
     void handleTouchFingerEvent(SDL_TouchFingerEvent* event);
@@ -101,6 +103,7 @@ private:
         KeyComboToggleMouseMode,
         KeyComboToggleCursorHide,
         KeyComboToggleMinimize,
+        KeyComboPasteText,
         KeyComboMax
     };
 

app/streaming/input/keyboard.cpp

@@ -87,6 +87,30 @@ void SdlInputHandler::performPendingSpecialKeyCombo()
 
         SDL_MinimizeWindow(m_Window);
         break;
+
+    case KeyComboPasteText:
+    {
+        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
+                    "Detected paste text combo");
+        const char* text = SDL_GetClipboardText();
+        if (text != nullptr) {
+            // Reset pending key combo before pasting,
+            // otherwise it will ignore our keypresses.
+            m_PendingKeyCombo = KeyComboMax;
+
+            // Send the text and free it as required by SDL
+            sendText(text);
+            SDL_free((void*)text);
+        }
+        else {
+            SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                        "No text in clipboard to paste!");
+        }
+        break;
+    }
+
+    default:
+        Q_UNREACHABLE();
     }
 
     // Reset pending key combo