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Make the browser scroll with touchpad on Wayland

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And generally clear up scroll handling.
This commit is contained in:
Přemysl Eric Janouch
2022-07-11 04:09:49 +02:00
parent c6096d05b5
commit 1fee920902
2 changed files with 37 additions and 3 deletions
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38
fiv-browser.c
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@@ -15,10 +15,15 @@
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
#include "config.h"
#include <math.h>
#include <pixman.h>
#include "config.h"
#include <gtk/gtk.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif // GDK_WINDOWING_X11
#include "fiv-browser.h"
#include "fiv-context-menu.h"
@@ -941,6 +946,22 @@ fiv_browser_realize(GtkWidget *widget)
GDK_KEY_PRESS_MASK,
};
// On Wayland, touchpad scrolling doesn't emulate the scroll wheel,
// making GDK_SMOOTH_SCROLL_MASK necessary for our GtkScrolledWindow.
// On X11 and Windows, this merely makes touchpad scrolling smoother.
//
// Note that Apple Magic Mouse's touchpad also sends out smooth scrolling
// events, and is indistinguishable from a mouse wheel (GDK_SOURCE_MOUSE,
// sends LIBINPUT_EVENT_POINTER_SCROLL_WHEEL). Yet, curiously,
// something in the stack on Wayland makes scrolling events discrete.
#ifdef GDK_WINDOWING_X11
// XXX: On X11 (at least, not on Wayland or Windows), the first scroll wheel
// event only produces a smooth stop event. Not our bug, yet annoying.
// We might make smooth scrolling support optional.
if (!GDK_IS_X11_WINDOW(gtk_widget_get_parent_window(widget)))
#endif // GDK_WINDOWING_X11
attributes.event_mask |= GDK_SMOOTH_SCROLL_MASK;
// We need this window to receive input events at all.
// TODO(p): See if input events bubble up to parents.
GdkWindow *window = gdk_window_new(gtk_widget_get_parent_window(widget),
@@ -1166,6 +1187,7 @@ fiv_browser_scroll_event(GtkWidget *widget, GdkEventScroll *event)
GDK_CONTROL_MASK)
return FALSE;
static double delta = 0;
switch (event->direction) {
case GDK_SCROLL_UP:
set_item_size(self, self->item_size + 1);
@@ -1173,8 +1195,20 @@ fiv_browser_scroll_event(GtkWidget *widget, GdkEventScroll *event)
case GDK_SCROLL_DOWN:
set_item_size(self, self->item_size - 1);
return TRUE;
case GDK_SCROLL_SMOOTH:
// On GDK/Wayland, the mouse wheel will typically create 1.5 deltas,
// after dividing a 15 degree click angle from libinput by 10.
// On X11, as libinput(4) indicates, the delta will always be 1.0.
if ((delta += event->delta_y) <= -1)
set_item_size(self, self->item_size + 1);
else if (delta >= +1)
set_item_size(self, self->item_size - 1);
else if (!event->is_stop)
return TRUE;
delta = 0;
return TRUE;
default:
// For some reason, we can also get GDK_SCROLL_SMOOTH.
// Left/right are good to steal from GtkScrolledWindow for consistency.
return TRUE;
}