[PATCH] add mouse scrolling arrowpress emulation when in altscreen

[hhm]

Adds an option to emulate arrow presses when the scrolling in altscreen. I originally saw such a feature in <https://developer.gnome.org/vte/>.

I hope I coded this correctly! If I did not, feel free to change it to how you see fit.

The patch is inline and attached.

diff --git a/pangoterm.c b/pangoterm.c
index e403896..82564d3 100644
--- a/pangoterm.c
+++ b/pangoterm.c
@@ -19,6 +19,8 @@ CONF_INT(cursor_blink_interval, 0, 500, "Cursor blink interval", "MSEC");
 CONF_BOOL(bold_highbright, 0, TRUE, "Bold is high-brightness");
 CONF_BOOL(altscreen, 0, TRUE, "Alternate screen buffer switching");

+CONF_BOOL(altscreen_scroll, 0, FALSE, "Emulate arrows for mouse scrolling when in alternate screen buffer");
+
 CONF_INT(scrollback_size, 0, 1000, "Scrollback size", "LINES");

 CONF_INT(scrollbar_width, 0, 3, "Scroll bar width", "PIXELS");
@@ -1152,8 +1154,21 @@ static VTermScreenCallbacks cb = {

 static void scroll_delta(PangoTerm *pt, int delta)
 {
- if(pt->on_altscreen)
+ if(pt->on_altscreen) {
+ if (CONF_altscreen_scroll) {
+ VTermKey which_arrow;
+ if(delta > 0) {
+ which_arrow = VTERM_KEY_UP;
+ } else if(delta < 0) {
+ which_arrow = VTERM_KEY_DOWN;
+ }
+ for(int i=0; i < ((which_arrow == VTERM_KEY_DOWN) ? -delta : delta); i++) {
+ vterm_input_push_key(pt->vt, VTERM_MOD_NONE, which_arrow);
+ }
+ term_flush_output(pt);
+ }
     return;
+ }

   if(delta > 0) {
     if(pt->scroll_offs + delta > pt->scroll_current)
diff --git a/pangoterm.cfg b/pangoterm.cfg
index 79ff996..2c95249 100644
--- a/pangoterm.cfg
+++ b/pangoterm.cfg
@@ -20,6 +20,7 @@
 # cursor_blink_interval = 500 (in msec)
 # bold_highbright = true
 # altscreen = true
+# altscreen_scroll = false
 # term = "xterm"
 # scrollback_size = 1000
 # scrollbar_width = 3

[hhm (hhm)]

New version. A bit of cleaning. Horizontal scrolling in altscreen.

[James McCoy (jamessan)]

This is essentially the same thing as xterm's alternateScroll resource added in patch 282.

[Paul "LeoNerd" Evans (leonerd)]

Patch applied as -r566