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Zoom with the scroll wheel

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This commit is contained in:
Přemysl Eric Janouch 2021-09-17 20:42:12 +02:00
parent f24885db54
commit cc29f80bb2
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 59 additions and 3 deletions
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62
fastiv-view.c
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@ -77,11 +77,43 @@ fastiv_view_get_preferred_width(GtkWidget *widget,
*natural = get_display_width(self);
}
static void
fastiv_view_realize(GtkWidget *widget)
{
GtkAllocation allocation;
gtk_widget_get_allocation(widget, &allocation);
GdkWindowAttr attributes = {
.window_type = GDK_WINDOW_CHILD,
.x = allocation.x,
.y = allocation.y,
.width = allocation.width,
.height = allocation.height,
// Input-only would presumably also work (as in GtkPathBar, e.g.),
// but it merely seems to involve more work.
.wclass = GDK_INPUT_OUTPUT,
// Assuming here that we can't ask for a higher-precision Visual
// than what we get automatically.
.visual = gtk_widget_get_visual(widget),
.event_mask = gtk_widget_get_events(widget) | GDK_SCROLL_MASK,
};
// We need this window to receive input events at all.
GdkWindow *window = gdk_window_new(gtk_widget_get_parent_window(widget),
&attributes, GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL);
gtk_widget_register_window(widget, window);
gtk_widget_set_window(widget, window);
gtk_widget_set_realized(widget, TRUE);
}
static gboolean
fastiv_view_draw(GtkWidget *widget, cairo_t *cr)
{
FastivView *self = FASTIV_VIEW(widget);
if (!self->surface)
if (!self->surface
|| !gtk_cairo_should_draw_window(cr, gtk_widget_get_window(widget)))
return TRUE;
// TODO(p): Make this adjustable later.
@ -109,6 +141,27 @@ fastiv_view_draw(GtkWidget *widget, cairo_t *cr)
return TRUE;
}
static gboolean
fastiv_view_scroll_event(GtkWidget *widget, GdkEventScroll *event)
{
FastivView *self = FASTIV_VIEW(widget);
if (!self->surface)
return FALSE;
switch (event->direction) {
case GDK_SCROLL_UP:
self->scale *= 1.4;
gtk_widget_queue_resize(widget);
return TRUE;
case GDK_SCROLL_DOWN:
self->scale /= 1.4;
gtk_widget_queue_resize(widget);
return TRUE;
default:
return FALSE;
}
}
static void
fastiv_view_class_init(FastivViewClass *klass)
{
@ -118,15 +171,18 @@ fastiv_view_class_init(FastivViewClass *klass)
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
widget_class->get_preferred_height = fastiv_view_get_preferred_height;
widget_class->get_preferred_width = fastiv_view_get_preferred_width;
widget_class->realize = fastiv_view_realize;
widget_class->draw = fastiv_view_draw;
widget_class->scroll_event = fastiv_view_scroll_event;
// TODO(p): Later override "screen_changed", recreate Pango layouts there,
// if we get to have any, or otherwise reflect DPI changes.
}
static void
fastiv_view_init(FastivView *self)
{
self->scale = 1.0;
gtk_widget_set_has_window(GTK_WIDGET(self), FALSE);
}
// --- Picture loading ---------------------------------------------------------