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Handle view bindings through an action signal 

This makes them adjustable.
This commit is contained in:
Přemysl Eric Janouch 2022-01-09 07:44:47 +01:00
parent 09e5a02ed6
commit 25dcc3b136
Signed by: p
GPG Key ID: A0420B94F92B9493
3 changed files with 128 additions and 121 deletions
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6
README.adoc
View File

@ -61,6 +61,12 @@ _~/.config/gtk-3.0/gtk.css_:
fiv-browser { -FivBrowser-spacing: 0; padding: 0; border: 0; margin: 0; }
Similarly, you can adjust some of the key bindings, as per the command table
in link:fiv-view.h[]:
@binding-set ViewBindings { bind 'p' { 'command' (print) }; }
fiv-view { -gtk-key-bindings: ViewBindings; }
Should you want to experiment, you will find the GTK+ inspector very helpful.
Contributing and Support

178
fiv-view.c
View File

@ -31,6 +31,23 @@
#include <gdk/gdkquartz.h>
#endif // GDK_WINDOWING_QUARTZ
GType
fiv_view_command_get_type(void)
{
static gsize guard;
if (g_once_init_enter(&guard)) {
#define XX(constant, name) {constant, #constant, name},
static const GEnumValue values[] = {FIV_VIEW_COMMANDS(XX) {}};
#undef XX
GType type = g_enum_register_static(
g_intern_static_string("FivViewCommand"), values);
g_once_init_leave(&guard, type);
}
return guard;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct _FivView {
GtkWidget parent_instance;
gchar *uri; ///< Path to the current image (if any)
@ -112,6 +129,14 @@ enum {
static GParamSpec *view_properties[N_PROPERTIES];
enum {
COMMAND,
LAST_SIGNAL
};
// Globals are, sadly, the canonical way of storing signal numbers.
static guint view_signals[LAST_SIGNAL];
static void
fiv_view_finalize(GObject *gobject)
{
@ -478,26 +503,24 @@ set_scale(FivView *self, double scale)
return set_scale_to_fit(self, false);
}
static gboolean
static void
set_scale_to_fit_width(FivView *self)
{
double w = get_surface_dimensions(self).width;
int allocated = gtk_widget_get_allocated_width(
gtk_widget_get_parent(GTK_WIDGET(self)));
if (ceil(w * self->scale) > allocated)
return set_scale(self, allocated / w);
return TRUE;
set_scale(self, allocated / w);
}
static gboolean
static void
set_scale_to_fit_height(FivView *self)
{
double h = get_surface_dimensions(self).height;
int allocated = gtk_widget_get_allocated_height(
gtk_widget_get_parent(GTK_WIDGET(self)));
if (ceil(h * self->scale) > allocated)
return set_scale(self, allocated / h);
return TRUE;
set_scale(self, allocated / h);
}
static gboolean
@ -951,102 +974,27 @@ info(FivView *self)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static inline gboolean
command(FivView *self, FivViewCommand command)
{
fiv_view_command(self, command);
return TRUE;
}
static gboolean
fiv_view_key_press_event(GtkWidget *widget, GdkEventKey *event)
{
FivView *self = FIV_VIEW(widget);
if (!self->image)
return FALSE;
// It should not matter that GDK_KEY_plus involves holding Shift.
guint state = event->state & gtk_accelerator_get_default_mod_mask() &
~GDK_SHIFT_MASK;
// The standard, intuitive bindings.
if (state == GDK_CONTROL_MASK) {
switch (event->keyval) {
case GDK_KEY_0:
return command(self, FIV_VIEW_COMMAND_ZOOM_1);
case GDK_KEY_plus:
return command(self, FIV_VIEW_COMMAND_ZOOM_IN);
case GDK_KEY_minus:
return command(self, FIV_VIEW_COMMAND_ZOOM_OUT);
case GDK_KEY_p:
return command(self, FIV_VIEW_COMMAND_PRINT);
case GDK_KEY_s:
return command(self, FIV_VIEW_COMMAND_SAVE_PAGE);
case GDK_KEY_S:
return save_as(self, self->frame);
}
}
if (state == GDK_MOD1_MASK) {
switch (event->keyval) {
case GDK_KEY_Return:
return command(self, FIV_VIEW_COMMAND_INFO);
}
}
if (state != 0)
return FALSE;
switch (event->keyval) {
case GDK_KEY_1:
case GDK_KEY_2:
case GDK_KEY_3:
case GDK_KEY_4:
case GDK_KEY_5:
case GDK_KEY_6:
case GDK_KEY_7:
case GDK_KEY_8:
case GDK_KEY_9:
// So far, our commands cannot accept arguments, so these few are hardcoded.
if (self->image &&
!(event->state & gtk_accelerator_get_default_mod_mask()) &&
event->keyval >= GDK_KEY_1 && event->keyval <= GDK_KEY_9)
return set_scale(self, event->keyval - GDK_KEY_0);
case GDK_KEY_plus:
return command(self, FIV_VIEW_COMMAND_ZOOM_IN);
case GDK_KEY_minus:
return command(self, FIV_VIEW_COMMAND_ZOOM_OUT);
case GDK_KEY_w:
return set_scale_to_fit_width(self);
case GDK_KEY_h:
return set_scale_to_fit_height(self);
return GTK_WIDGET_CLASS(fiv_view_parent_class)
->key_press_event(widget, event);
}
case GDK_KEY_c:
return command(self, FIV_VIEW_COMMAND_TOGGLE_CMS);
case GDK_KEY_x: // Inspired by gThumb, which has more such modes.
return command(self, FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT);
case GDK_KEY_i:
return command(self, FIV_VIEW_COMMAND_TOGGLE_FILTER);
case GDK_KEY_t:
return command(self, FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD);
case GDK_KEY_e:
return command(self, FIV_VIEW_COMMAND_TOGGLE_ENHANCE);
case GDK_KEY_less:
return command(self, FIV_VIEW_COMMAND_ROTATE_LEFT);
case GDK_KEY_equal:
return command(self, FIV_VIEW_COMMAND_MIRROR);
case GDK_KEY_greater:
return command(self, FIV_VIEW_COMMAND_ROTATE_RIGHT);
case GDK_KEY_bracketleft:
return command(self, FIV_VIEW_COMMAND_PAGE_PREVIOUS);
case GDK_KEY_bracketright:
return command(self, FIV_VIEW_COMMAND_PAGE_NEXT);
case GDK_KEY_braceleft:
return command(self, FIV_VIEW_COMMAND_FRAME_PREVIOUS);
case GDK_KEY_braceright:
return command(self, FIV_VIEW_COMMAND_FRAME_NEXT);
case GDK_KEY_space:
return command(self, FIV_VIEW_COMMAND_TOGGLE_PLAYBACK);
}
return FALSE;
static void
bind(GtkBindingSet *bs, guint keyval, GdkModifierType modifiers,
FivViewCommand command)
{
gtk_binding_entry_add_signal(
bs, keyval, modifiers, "command", 1, FIV_TYPE_VIEW_COMMAND, command);
}
static void
@ -1093,6 +1041,11 @@ fiv_view_class_init(FivViewClass *klass)
g_object_class_install_properties(
object_class, N_PROPERTIES, view_properties);
view_signals[COMMAND] =
g_signal_new_class_handler("command", G_TYPE_FROM_CLASS(klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK(fiv_view_command),
NULL, NULL, NULL, G_TYPE_NONE, 1, FIV_TYPE_VIEW_COMMAND);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
widget_class->get_preferred_height = fiv_view_get_preferred_height;
widget_class->get_preferred_width = fiv_view_get_preferred_width;
@ -1105,6 +1058,37 @@ fiv_view_class_init(FivViewClass *klass)
widget_class->scroll_event = fiv_view_scroll_event;
widget_class->key_press_event = fiv_view_key_press_event;
GtkBindingSet *bs = gtk_binding_set_by_class(klass);
// First, the standard, intuitive bindings.
bind(bs, GDK_KEY_0, GDK_CONTROL_MASK, FIV_VIEW_COMMAND_ZOOM_1);
bind(bs, GDK_KEY_plus, GDK_CONTROL_MASK, FIV_VIEW_COMMAND_ZOOM_IN);
bind(bs, GDK_KEY_minus, GDK_CONTROL_MASK, FIV_VIEW_COMMAND_ZOOM_OUT);
bind(bs, GDK_KEY_p, GDK_CONTROL_MASK, FIV_VIEW_COMMAND_PRINT);
bind(bs, GDK_KEY_s, GDK_CONTROL_MASK, FIV_VIEW_COMMAND_SAVE_PAGE);
bind(bs, GDK_KEY_s, GDK_MOD1_MASK, FIV_VIEW_COMMAND_SAVE_FRAME);
bind(bs, GDK_KEY_Return, GDK_MOD1_MASK, FIV_VIEW_COMMAND_INFO);
// The scale-to-fit binding is from gThumb, which has more such modes.
bind(bs, GDK_KEY_plus, 0, FIV_VIEW_COMMAND_ZOOM_IN);
bind(bs, GDK_KEY_minus, 0, FIV_VIEW_COMMAND_ZOOM_OUT);
bind(bs, GDK_KEY_w, 0, FIV_VIEW_COMMAND_FIT_WIDTH);
bind(bs, GDK_KEY_h, 0, FIV_VIEW_COMMAND_FIT_HEIGHT);
bind(bs, GDK_KEY_x, 0, FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT);
bind(bs, GDK_KEY_c, 0, FIV_VIEW_COMMAND_TOGGLE_CMS);
bind(bs, GDK_KEY_i, 0, FIV_VIEW_COMMAND_TOGGLE_FILTER);
bind(bs, GDK_KEY_t, 0, FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD);
bind(bs, GDK_KEY_e, 0, FIV_VIEW_COMMAND_TOGGLE_ENHANCE);
bind(bs, GDK_KEY_less, 0, FIV_VIEW_COMMAND_ROTATE_LEFT);
bind(bs, GDK_KEY_equal, 0, FIV_VIEW_COMMAND_MIRROR);
bind(bs, GDK_KEY_greater, 0, FIV_VIEW_COMMAND_ROTATE_RIGHT);
bind(bs, GDK_KEY_bracketleft, 0, FIV_VIEW_COMMAND_PAGE_PREVIOUS);
bind(bs, GDK_KEY_bracketright, 0, FIV_VIEW_COMMAND_PAGE_NEXT);
bind(bs, GDK_KEY_braceleft, 0, FIV_VIEW_COMMAND_FRAME_PREVIOUS);
bind(bs, GDK_KEY_braceright, 0, FIV_VIEW_COMMAND_FRAME_NEXT);
bind(bs, GDK_KEY_space, 0, FIV_VIEW_COMMAND_TOGGLE_PLAYBACK);
// TODO(p): Later override "screen_changed", recreate Pango layouts there,
// if we get to have any, or otherwise reflect DPI changes.
gtk_widget_class_set_css_name(widget_class, "fiv-view");
@ -1277,6 +1261,8 @@ fiv_view_command(FivView *self, FivViewCommand command)
print(self);
break; case FIV_VIEW_COMMAND_SAVE_PAGE:
save_as(self, NULL);
break; case FIV_VIEW_COMMAND_SAVE_FRAME:
save_as(self, self->frame);
break; case FIV_VIEW_COMMAND_INFO:
info(self);
@ -1286,6 +1272,10 @@ fiv_view_command(FivView *self, FivViewCommand command)
set_scale(self, self->scale / SCALE_STEP);
break; case FIV_VIEW_COMMAND_ZOOM_1:
set_scale(self, 1.0);
break; case FIV_VIEW_COMMAND_FIT_WIDTH:
set_scale_to_fit_width(self);
break; case FIV_VIEW_COMMAND_FIT_HEIGHT:
set_scale_to_fit_height(self);
break; case FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT:
set_scale_to_fit(self, !self->scale_to_fit);
}

65
fiv-view.h
View File

@ -25,35 +25,46 @@ G_DECLARE_FINAL_TYPE(FivView, fiv_view, FIV, VIEW, GtkWidget)
/// Try to open the given file, synchronously, to be displayed by the widget.
gboolean fiv_view_open(FivView *self, const gchar *uri, GError **error);
// And this is how you avoid glib-mkenums.
typedef enum _FivViewCommand {
FIV_VIEW_COMMAND_ROTATE_LEFT = 1,
FIV_VIEW_COMMAND_MIRROR,
FIV_VIEW_COMMAND_ROTATE_RIGHT,
FIV_VIEW_COMMAND_PAGE_FIRST,
FIV_VIEW_COMMAND_PAGE_PREVIOUS,
FIV_VIEW_COMMAND_PAGE_NEXT,
FIV_VIEW_COMMAND_PAGE_LAST,
FIV_VIEW_COMMAND_FRAME_FIRST,
FIV_VIEW_COMMAND_FRAME_PREVIOUS,
FIV_VIEW_COMMAND_FRAME_NEXT,
// Going to the end frame makes no sense, wrap around if needed.
FIV_VIEW_COMMAND_TOGGLE_PLAYBACK,
FIV_VIEW_COMMAND_TOGGLE_CMS,
FIV_VIEW_COMMAND_TOGGLE_FILTER,
FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD,
FIV_VIEW_COMMAND_TOGGLE_ENHANCE,
FIV_VIEW_COMMAND_PRINT,
FIV_VIEW_COMMAND_SAVE_PAGE,
FIV_VIEW_COMMAND_INFO,
FIV_VIEW_COMMAND_ZOOM_IN,
FIV_VIEW_COMMAND_ZOOM_OUT,
FIV_VIEW_COMMAND_ZOOM_1,
FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT,
#define FIV_VIEW_COMMANDS(XX) \
XX(FIV_VIEW_COMMAND_ROTATE_LEFT, "rotate-left") \
XX(FIV_VIEW_COMMAND_MIRROR, "mirror") \
XX(FIV_VIEW_COMMAND_ROTATE_RIGHT, "rotate-right") \
\
XX(FIV_VIEW_COMMAND_PAGE_FIRST, "page-first") \
XX(FIV_VIEW_COMMAND_PAGE_PREVIOUS, "page-previous") \
XX(FIV_VIEW_COMMAND_PAGE_NEXT, "page-next") \
XX(FIV_VIEW_COMMAND_PAGE_LAST, "page-last") \
\
XX(FIV_VIEW_COMMAND_FRAME_FIRST, "frame-first") \
XX(FIV_VIEW_COMMAND_FRAME_PREVIOUS, "frame-previous") \
XX(FIV_VIEW_COMMAND_FRAME_NEXT, "frame-next") \
/* Going to the end frame makes no sense, wrap around if needed. */ \
XX(FIV_VIEW_COMMAND_TOGGLE_PLAYBACK, "toggle-playback") \
\
XX(FIV_VIEW_COMMAND_TOGGLE_CMS, "toggle-cms") \
XX(FIV_VIEW_COMMAND_TOGGLE_FILTER, "toggle-filter") \
XX(FIV_VIEW_COMMAND_TOGGLE_CHECKERBOARD, "toggle-checkerboard") \
XX(FIV_VIEW_COMMAND_TOGGLE_ENHANCE, "toggle-enhance") \
XX(FIV_VIEW_COMMAND_PRINT, "print") \
XX(FIV_VIEW_COMMAND_SAVE_PAGE, "save-page") \
XX(FIV_VIEW_COMMAND_SAVE_FRAME, "save-frame") \
XX(FIV_VIEW_COMMAND_INFO, "info") \
\
XX(FIV_VIEW_COMMAND_ZOOM_IN, "zoom-in") \
XX(FIV_VIEW_COMMAND_ZOOM_OUT, "zoom-out") \
XX(FIV_VIEW_COMMAND_ZOOM_1, "zoom-1") \
XX(FIV_VIEW_COMMAND_FIT_WIDTH, "fit-width") \
XX(FIV_VIEW_COMMAND_FIT_HEIGHT, "fit-height") \
XX(FIV_VIEW_COMMAND_TOGGLE_SCALE_TO_FIT, "toggle-scale-to-fit")
#define XX(constant, name) constant,
FIV_VIEW_COMMANDS(XX)
#undef XX
} FivViewCommand;
GType fiv_view_command_get_type(void) G_GNUC_CONST;
#define FIV_TYPE_VIEW_COMMAND (fiv_view_command_get_type())
/// Execute a user action.
void fiv_view_command(FivView *self, FivViewCommand command);