}
#ifndef DISABLE_MOUSE
-/* Check for a mouse event, and if one's taken place, save the
- * coordinates where it took place in mouse_x and mouse_y. After that,
- * assuming allow_shortcuts is FALSE, if the shortcut list on the
- * bottom two lines of the screen is visible and the mouse event took
- * place on it, figure out which shortcut was clicked and put back the
- * equivalent keystroke(s). Return FALSE if no keystrokes were
- * put back, or TRUE if at least one was. Assume that KEY_MOUSE has
- * already been read in. */
+/* Handle any mouse events that may have occurred. We currently handle
+ * releases or clicks of the first mouse button. If allow_shortcuts is
+ * TRUE, releasing or clicking on a visible shortcut will put back the
+ * keystroke associated with that shortcut. If NCURSES_MOUSE_VERSION is
+ * at least 2, we also currently handle presses of the fourth mouse
+ * button (upward rolls of the mouse wheel) by putting back the
+ * keystrokes to move up, and presses of the fifth mouse button
+ * (downward rolls of the mouse wheel) by putting back the keystrokes to
+ * move down. Return FALSE if we don't put back any keystrokes in the
+ * course of handling mouse events, or TRUE if we do. Assume that
+ * KEY_MOUSE has already been read in. */
bool get_mouseinput(int *mouse_x, int *mouse_y, bool allow_shortcuts)
{
MEVENT mevent;
if (getmouse(&mevent) == ERR)
return FALSE;
- /* If it's not a release or click of the first mouse button, get
- * out. */
- if (!(mevent.bstate & (BUTTON1_RELEASED | BUTTON1_CLICKED)))
- return FALSE;
-
- /* Save the screen coordinates where the mouse event took place. */
- *mouse_x = mevent.x;
- *mouse_y = mevent.y;
-
- /* If we're allowing shortcuts, the current shortcut list is being
- * displayed on the last two lines of the screen, and the mouse
- * event took place inside it, we need to figure out which shortcut
- * was clicked and put back the equivalent keystroke(s) for it. */
- if (allow_shortcuts && !ISSET(NO_HELP) && wenclose(bottomwin,
- *mouse_y, *mouse_x)) {
- int i, j;
- size_t currslen;
- /* The number of shortcuts in the current shortcut list. */
- const shortcut *s = currshortcut;
- /* The actual shortcut we clicked on, starting at the first
- * one in the current shortcut list. */
-
- /* Get the shortcut lists' length. */
- if (currshortcut == main_list)
- currslen = MAIN_VISIBLE;
- else {
- currslen = length_of_list(currshortcut);
-
- /* We don't show any more shortcuts than the main list
- * does. */
- if (currslen > MAIN_VISIBLE)
+ /* Handle releases or clicks of the first mouse button. */
+ if (mevent.bstate & (BUTTON1_RELEASED | BUTTON1_CLICKED)) {
+ /* Save the screen coordinates where the mouse event took
+ * place. */
+ *mouse_x = mevent.x;
+ *mouse_y = mevent.y;
+
+ /* If we're allowing shortcuts, the current shortcut list is
+ * being displayed on the last two lines of the screen, and the
+ * mouse event took place inside it, we need to figure out which
+ * shortcut was clicked and put back the equivalent keystroke(s)
+ * for it. */
+ if (allow_shortcuts && !ISSET(NO_HELP) && wenclose(bottomwin,
+ *mouse_y, *mouse_x)) {
+ int i, j;
+ size_t currslen;
+ /* The number of shortcuts in the current shortcut
+ * list. */
+ const shortcut *s = currshortcut;
+ /* The actual shortcut we clicked on, starting at the
+ * first one in the current shortcut list. */
+
+ /* Get the shortcut lists' length. */
+ if (currshortcut == main_list)
currslen = MAIN_VISIBLE;
- }
-
- /* Calculate the width of all of the shortcuts in the list
- * except for the last two, which are longer by (COLS % i)
- * columns so as to not waste space. */
- if (currslen < 2)
- i = COLS / (MAIN_VISIBLE / 2);
- else
- i = COLS / ((currslen / 2) + (currslen % 2));
-
- /* Calculate the y-coordinate relative to the beginning of
- * the shortcut list in bottomwin, i.e. with the sizes of
- * topwin, edit, and the first line of bottomwin subtracted
- * out, and set j to it. */
- j = *mouse_y - (2 - no_more_space()) - editwinrows - 1;
-
- /* If we're on the statusbar, don't do anything. */
- if (j < 0)
- return FALSE;
-
- /* Calculate the x-coordinate relative to the beginning of the
- * shortcut list in bottomwin, and add it to j. j should now be
- * the index in the shortcut list of the shortcut we clicked. */
- j = (*mouse_x / i) * 2 + j;
+ else {
+ currslen = length_of_list(currshortcut);
- /* Adjust j if we clicked in the last two shortcuts. */
- if ((j >= currslen) && (*mouse_x % i < COLS % i))
- j -= 2;
+ /* We don't show any more shortcuts than the main list
+ * does. */
+ if (currslen > MAIN_VISIBLE)
+ currslen = MAIN_VISIBLE;
+ }
- /* If we're beyond the last shortcut, don't do anything. */
- if (j >= currslen)
+ /* Calculate the width of all of the shortcuts in the list
+ * except for the last two, which are longer by (COLS % i)
+ * columns so as to not waste space. */
+ if (currslen < 2)
+ i = COLS / (MAIN_VISIBLE / 2);
+ else
+ i = COLS / ((currslen / 2) + (currslen % 2));
+
+ /* Calculate the y-coordinate relative to the beginning of
+ * the shortcut list in bottomwin, i.e. with the sizes of
+ * topwin, edit, and the first line of bottomwin subtracted
+ * out, and set j to it. */
+ j = *mouse_y - (2 - no_more_space()) - editwinrows - 1;
+
+ /* If we're on the statusbar, don't do anything. */
+ if (j < 0)
+ return FALSE;
+
+ /* Calculate the x-coordinate relative to the beginning of
+ * the shortcut list in bottomwin, and add it to j. j
+ * should now be the index in the shortcut list of the
+ * shortcut we clicked. */
+ j = (*mouse_x / i) * 2 + j;
+
+ /* Adjust j if we clicked in the last two shortcuts. */
+ if ((j >= currslen) && (*mouse_x % i < COLS % i))
+ j -= 2;
+
+ /* If we're beyond the last shortcut, don't do anything. */
+ if (j >= currslen)
+ return FALSE;
+
+ /* Go through the shortcut list to determine which shortcut
+ * was clicked. */
+ for (; j > 0; j--)
+ s = s->next;
+
+ /* And put back the equivalent key. Assume that each
+ * shortcut has, at the very least, an equivalent control
+ * key, an equivalent primary meta key sequence, or both. */
+ if (s->ctrlval != NANO_NO_KEY) {
+ unget_kbinput(s->ctrlval, FALSE, FALSE);
+ return TRUE;
+ } else if (s->metaval != NANO_NO_KEY) {
+ unget_kbinput(s->metaval, TRUE, FALSE);
+ return TRUE;
+ }
+ } else
return FALSE;
-
- /* Go through the shortcut list to determine which shortcut was
- * clicked. */
- for (; j > 0; j--)
- s = s->next;
-
- /* And put back the equivalent key. Assume that each shortcut
- * has, at the very least, an equivalent control key, an
- * equivalent primary meta key sequence, or both. */
- if (s->ctrlval != NANO_NO_KEY) {
- unget_kbinput(s->ctrlval, FALSE, FALSE);
- return TRUE;
- } else if (s->metaval != NANO_NO_KEY) {
- unget_kbinput(s->metaval, TRUE, FALSE);
- return TRUE;
- }
}
- return FALSE;
+#if NCURSES_MOUSE_VERSION >= 2
+ /* Handle presses of the fourth mouse button (upward rolls of the
+ * mouse wheel). */
+ else if (mevent.bstate & BUTTON4_PRESSED) {
+ int i = 0;
+
+ /* One upward roll of the mouse wheel is equivalent to moving up
+ * three lines. */
+ for (; i < 3; i++)
+ unget_kbinput(NANO_PREVLINE_KEY, FALSE, FALSE);
+
+ return TRUE;
+ /* Handle presses of the fifth mouse button (downward rolls of the
+ * mouse wheel). */
+ } else if (mevent.bstate & BUTTON5_PRESSED) {
+ int i = 0;
+
+ /* One downward roll of the mouse wheel is equivalent to moving
+ * down three lines. */
+ for (; i < 3; i++)
+ unget_kbinput(NANO_NEXTLINE_KEY, FALSE, FALSE);
+
+ return TRUE;
+ }
+#endif
+ else
+ return FALSE;
}
#endif /* !DISABLE_MOUSE */
projects / nano.git / commitdiff