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-rw-r--r--fiv-jpegcrop.c74
1 files changed, 69 insertions, 5 deletions
diff --git a/fiv-jpegcrop.c b/fiv-jpegcrop.c
index 12d0981..fad0c22 100644
--- a/fiv-jpegcrop.c
+++ b/fiv-jpegcrop.c
@@ -267,6 +267,56 @@ on_motion(G_GNUC_UNUSED GtkWidget *self, GdkEventMotion *event,
return FALSE;
}
+static void
+on_drag_begin(
+ GtkGestureDrag *self, gdouble start_x, gdouble start_y, gpointer user_data)
+{
+ // The middle mouse button will never be triggered by touch screens,
+ // so there is only the NULL sequence to care about.
+ gtk_gesture_set_state(GTK_GESTURE(self), GTK_EVENT_SEQUENCE_CLAIMED);
+
+ GdkWindow *window = gtk_widget_get_window(g.view);
+ GdkCursor *cursor =
+ gdk_cursor_new_from_name(gdk_window_get_display(window), "grabbing");
+ gdk_window_set_cursor(window, cursor);
+ g_object_unref(cursor);
+
+ double *last = user_data;
+ last[0] = start_x;
+ last[1] = start_y;
+}
+
+static void
+on_drag_update(GtkGestureDrag *self, gdouble offset_x, gdouble offset_y,
+ gpointer user_data)
+{
+ double start_x = 0, start_y = 0;
+ gtk_gesture_drag_get_start_point(self, &start_x, &start_y);
+
+ double *last = user_data,
+ diff_x = (start_x + offset_x) - last[0],
+ diff_y = (start_y + offset_y) - last[1];
+
+ last[0] = start_x + offset_x;
+ last[1] = start_y + offset_y;
+
+ GtkScrolledWindow *sw = GTK_SCROLLED_WINDOW(g.scrolled);
+ GtkAdjustment *h = gtk_scrolled_window_get_hadjustment(sw);
+ GtkAdjustment *v = gtk_scrolled_window_get_vadjustment(sw);
+ if (diff_x)
+ gtk_adjustment_set_value(h, gtk_adjustment_get_value(h) - diff_x);
+ if (diff_y)
+ gtk_adjustment_set_value(v, gtk_adjustment_get_value(v) - diff_y);
+}
+
+static void
+on_drag_end(G_GNUC_UNUSED GtkGestureDrag *self, G_GNUC_UNUSED gdouble start_x,
+ G_GNUC_UNUSED gdouble start_y, G_GNUC_UNUSED gpointer user_data)
+{
+ // Cursors follow the widget hierarchy.
+ gdk_window_set_cursor(gtk_widget_get_window(g.view), NULL);
+}
+
static gboolean
open_jpeg(const char *data, gsize len, GError **error)
{
@@ -405,15 +455,16 @@ main(int argc, char *argv[])
g.view = gtk_drawing_area_new();
gtk_widget_set_size_request(g.view, g.width + 2, g.height + 2);
- gtk_widget_add_events(
- g.view, GDK_BUTTON_PRESS_MASK | GDK_POINTER_MOTION_MASK);
- g_signal_connect(g.view, "draw", G_CALLBACK(on_draw), NULL);
+ gtk_widget_add_events(g.view,
+ GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
+ GDK_POINTER_MOTION_MASK);
+ g_signal_connect(g.view, "draw",
+ G_CALLBACK(on_draw), NULL);
g_signal_connect(g.view, "button-press-event",
G_CALLBACK(on_press), NULL);
g_signal_connect(g.view, "motion-notify-event",
G_CALLBACK(on_motion), NULL);
- // TODO(p): Track middle mouse button drags, adjust the adjustments.
g.scrolled = gtk_scrolled_window_new(NULL, NULL);
gtk_scrolled_window_set_overlay_scrolling(
GTK_SCROLLED_WINDOW(g.scrolled), FALSE);
@@ -422,13 +473,26 @@ main(int argc, char *argv[])
gtk_scrolled_window_set_propagate_natural_height(
GTK_SCROLLED_WINDOW(g.scrolled), TRUE);
+ GtkGesture *drag = gtk_gesture_drag_new(g.scrolled);
+ gtk_event_controller_set_propagation_phase(
+ GTK_EVENT_CONTROLLER(drag), GTK_PHASE_CAPTURE);
+ gtk_gesture_single_set_button(GTK_GESTURE_SINGLE(drag), GDK_BUTTON_MIDDLE);
+
+ double last_drag_point[2] = {};
+ g_signal_connect(drag, "drag-begin",
+ G_CALLBACK(on_drag_begin), last_drag_point);
+ g_signal_connect(drag, "drag-update",
+ G_CALLBACK(on_drag_update), last_drag_point);
+ g_signal_connect(drag, "drag-end",
+ G_CALLBACK(on_drag_end), last_drag_point);
+
gtk_container_add(GTK_CONTAINER(g.scrolled), g.view);
gtk_container_add(GTK_CONTAINER(g.window), g.scrolled);
gtk_window_set_default_size(GTK_WINDOW(g.window), 800, 600);
gtk_widget_show_all(g.window);
// It probably needs to be realized.
- GdkWindow *window = gtk_widget_get_window(g.view);
+ GdkWindow *window = gtk_widget_get_window(g.scrolled);
GdkCursor *cursor =
gdk_cursor_new_from_name(gdk_window_get_display(window), "crosshair");
gdk_window_set_cursor(window, cursor);