input: modify interpretation of doubleclick events

The code combining button presses into multibutton commands prevented
single click commands from triggering if a doubleclick event had been
generated from the same button press. As a result using the mouse
wheel to seek worked very badly. Special-case doubleclick events in
the event interpretation code to avoid this issue. This changes the
sequence of generated "keys" for press-release-press-release from
MOUSE_BTN0   MOUSE_BTN0-MOUSE_BTN0_DBL   MOUSE_BTN0_DBL   to
MOUSE_BTN0   MOUSE_BTN0_DBL              MOUSE_BTN0.
"Keys" like MOUSE_BTN0-MOUSE_BTN0_DBL will never be generated now; any
existing configuration files using those need to be changed.

DOCS/man/en/mplayer.1

@@ -780,10 +780,6 @@ Time in milliseconds to recognize two consecutive button presses as
 a double-click (default: 300).
 Set to 0 to let your windowing system decide what a double-click is
 (\-vo directx only).
-.br
-.I NOTE:
-You will get slightly different behaviour depending on whether you bind
-MOUSE_BTN0_DBL or MOUSE_BTN0\-MOUSE_BTN0_DBL.
 .
 .TP
 .B \-edlout <filename>

input/input.c

@@ -1184,6 +1184,15 @@ static mp_cmd_t *interpret_key(struct input_ctx *ictx, int code)
         if (ictx->key_down[j] == code)
             break;
     }
+    bool doubleclick = code >= MOUSE_BTN0_DBL && code < MOUSE_BTN_DBL_END;
+    if (doubleclick) {
+        int btn = code - MOUSE_BTN0_DBL + MOUSE_BTN0;
+        if (!ictx->num_key_down
+            || ictx->key_down[ictx->num_key_down - 1] != btn)
+            return NULL;
+        j = ictx->num_key_down - 1;
+        ictx->key_down[j] = code;
+    }
     if (j == ictx->num_key_down) {  // was not already down; add temporarily
         if (ictx->num_key_down > MP_MAX_KEY_DOWN) {
             mp_tmsg(MSGT_INPUT, MSGL_ERR, "Too many key down events "
@@ -1198,6 +1207,10 @@ static mp_cmd_t *interpret_key(struct input_ctx *ictx, int code)
     ret = ictx->last_key_down ?
           get_cmd_from_keys(ictx, ictx->num_key_down, ictx->key_down)
           : NULL;
+    if (doubleclick) {
+        ictx->key_down[j] = code - MOUSE_BTN0_DBL + MOUSE_BTN0;
+        return ret;
+    }
     // Remove the key
     if (j + 1 < ictx->num_key_down)
         memmove(&ictx->key_down[j], &ictx->key_down[j + 1],

mp_fifo.c

@@ -31,8 +31,8 @@ struct mp_fifo {
     int readpos;
     int writepos;
     int size;
-    unsigned last_key_time[2];
+    int last_key_down;
-    int last_key[2];
+    unsigned last_down_time;
 };
 
 struct mp_fifo *mp_fifo_create(struct MPOpts *opts)
@@ -86,16 +86,10 @@ void mplayer_put_key(struct mp_fifo *fifo, int code)
     mplayer_put_key_internal(fifo, code);
     if (code & MP_KEY_DOWN) {
         code &= ~MP_KEY_DOWN;
-        fifo->last_key[1] = fifo->last_key[0];
+        if (fifo->last_key_down == code
-        fifo->last_key[0] = code;
+            && now - fifo->last_down_time < doubleclick_time)
-        fifo->last_key_time[1] = fifo->last_key_time[0];
-        fifo->last_key_time[0] = now;
-        if (fifo->last_key[1] == code
-            && now - fifo->last_key_time[1] < doubleclick_time)
             put_double(fifo, code);
-        return;
+        fifo->last_key_down = code;
+        fifo->last_down_time = now;
     }
-    if (fifo->last_key[0] == code && fifo->last_key[1] == code
-        && now - fifo->last_key_time[1] < doubleclick_time)
-        put_double(fifo, code);
 }