Add shortcuts for COPY and CUT

Send COPY and CUT on MOD+c and MOD+x (only supported for Android >= 7).

The shortcuts Ctrl+c and Ctrl+x should generally also work (even before
Android 7), but the active Android app may use them for other actions
instead.

README.md

@@ -608,12 +608,15 @@ _[Super] is typically the "Windows" or "Cmd" key._
  | Rotate device screen                        | `MOD`+`r`
  | Expand notification panel                   | `MOD`+`n`
  | Collapse notification panel                 | `MOD`+`Shift`+`n`
+ | Copy to clipboard³                          | `MOD`+`c`
+ | Cut to clipboard³                           | `MOD`+`x`
  | Paste computer clipboard to device          | `MOD`+`v`
  | Copy computer clipboard to device and paste | `MOD`+`Shift`+`v`
  | Enable/disable FPS counter (on stdout)      | `MOD`+`i`
 
 _¹Double-click on black borders to remove them._  
-_²Right-click turns the screen on if it was off, presses BACK otherwise._
+_²Right-click turns the screen on if it was off, presses BACK otherwise._  
+_³Only on Android >= 7._
 
 
 ## Custom paths

app/scrcpy.1

@@ -292,6 +292,14 @@ Expand notification panel
 .B MOD+Shift+n
 Collapse notification panel
 
+.TP
+.B Mod+c
+Copy to clipboard (inject COPY keycode, Android >= 7 only)
+
+.TP
+.B Mod+x
+Cut to clipboard (inject CUT keycode, Android >= 7 only)
+
 .TP
 .B MOD+v
 Paste computer clipboard to device

app/src/cli.c

@@ -260,6 +260,12 @@ scrcpy_print_usage(const char *arg0) {
         "    MOD+Shift+n\n"
         "        Collapse notification panel\n"
         "\n"
+        "    MOD+c\n"
+        "        Copy to clipboard (inject COPY keycode, Android >= 7 only)\n"
+        "\n"
+        "    MOD+x\n"
+        "        Cut to clipboard (inject CUT keycode, Android >= 7 only)\n"
+        "\n"
         "    MOD+v\n"
         "        Paste computer clipboard to device\n"
         "\n"

app/src/input_manager.c

@@ -129,6 +129,16 @@ action_menu(struct controller *controller, int actions) {
     send_keycode(controller, AKEYCODE_MENU, actions, "MENU");
 }
 
+static inline void
+action_copy(struct controller *controller, int actions) {
+    send_keycode(controller, AKEYCODE_COPY, actions, "COPY");
+}
+
+static inline void
+action_cut(struct controller *controller, int actions) {
+    send_keycode(controller, AKEYCODE_CUT, actions, "CUT");
+}
+
 // turn the screen on if it was off, press BACK otherwise
 static void
 press_back_or_turn_screen_on(struct controller *controller) {
@@ -382,6 +392,16 @@ input_manager_process_key(struct input_manager *im,
                     rotate_client_right(im->screen);
                 }
                 return;
+            case SDLK_c:
+                if (control && !shift && !repeat) {
+                    action_copy(controller, action);
+                }
+                return;
+            case SDLK_x:
+                if (control && !shift && !repeat) {
+                    action_cut(controller, action);
+                }
+                return;
             case SDLK_v:
                 if (control && !repeat && down) {
                     if (shift) {