gtk2/tests/testdnd3.c
Benjamin Otte a411959c91 droptarget: Redo
This is a huge reorganization of GtkDropTarget. I did not know how to
split this up, so it's unfortunately all one commit.

Highlights:

- Split GtkDropTarget into GtkDropTarget and GtkDropTargetAsync
  GtkDropTarget is the simple one that only works with GTypes and offers
  a synchronous interface.
  GtkDropTargetAsync retains the full old functionality and allows
  handling mime types.

- Drop events are handled differently
  Instead of picking a single drop target and sending all DND events to
  it, every event is sent to every drop target. The first one to handle
  the event gets to call gdk_drop_status(), further handlers do not
  interact with the GdkDrop.
  Of course, for the ultimate GDK_DROP_STARTING event, only the first
  one to accept the drop gets to handle it.
  This allows stacking DND event controllers that aren't necessarily
  interested in handling the event or that might decide later to drop
  it.

- Port all widgets to either of those
  Both have a somewhat changed API due to the new event handling.
  For the ones who should use the sync version, lots of cleanup was
  involved to operate on a sync API.
2020-03-02 03:18:55 +01:00

327 lines
8.9 KiB
C

#include <gtk/gtk.h>
static GdkContentProvider *
prepare (GtkDragSource *source, double x, double y)
{
GtkWidget *canvas;
GtkWidget *item;
canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
item = gtk_widget_pick (canvas, x, y, GTK_PICK_DEFAULT);
if (!GTK_IS_LABEL (item))
return NULL;
g_object_set_data (G_OBJECT (canvas), "dragged-item", item);
return gdk_content_provider_new_typed (GTK_TYPE_WIDGET, item);
}
static void
drag_begin (GtkDragSource *source, GdkDrag *drag)
{
GtkWidget *canvas;
GtkWidget *item;
canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
item = g_object_get_data (G_OBJECT (canvas), "dragged-item");
gtk_widget_set_opacity (item, 0.5);
}
static void
drag_end (GtkDragSource *source, GdkDrag *drag)
{
GtkWidget *canvas;
GtkWidget *item;
canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
item = g_object_get_data (G_OBJECT (canvas), "dragged-item");
g_object_set_data (G_OBJECT (canvas), "dragged-item", NULL);
gtk_widget_set_opacity (item, 1.0);
}
static void
drag_cancel (GtkDragSource *source,
GdkDrag *drag,
GdkDragCancelReason reason)
{
drag_end (source, drag);
}
typedef struct {
double x, y;
double angle;
double delta;
} TransformData;
static void
apply_transform (GtkWidget *item)
{
GtkWidget *canvas = gtk_widget_get_parent (item);
TransformData *data;
GskTransform *transform;
data = g_object_get_data (G_OBJECT (item), "transform-data");
transform = gsk_transform_rotate (gsk_transform_translate (NULL, &(graphene_point_t){data->x, data->y}),
data->angle + data->delta);
gtk_fixed_set_child_transform (GTK_FIXED (canvas), item, transform);
gsk_transform_unref (transform);
}
static gboolean
drag_drop (GtkDropTarget *target,
const GValue *value,
double x,
double y)
{
GtkWidget *item;
TransformData *transform_data;
GtkWidget *canvas;
GtkWidget *last_child;
item = g_value_get_object (value);
transform_data = g_object_get_data (G_OBJECT (item), "transform-data");
transform_data->x = x;
transform_data->y = y;
canvas = gtk_widget_get_parent (item);
last_child = gtk_widget_get_last_child (canvas);
if (item != last_child)
gtk_widget_insert_after (item, canvas, last_child);
apply_transform (item);
return TRUE;
}
static GtkWidget *
canvas_new (void)
{
GtkWidget *canvas;
GtkDragSource *source;
GtkDropTarget *dest;
canvas = gtk_fixed_new ();
gtk_widget_set_hexpand (canvas, TRUE);
gtk_widget_set_vexpand (canvas, TRUE);
gtk_style_context_add_class (gtk_widget_get_style_context (canvas), "frame");
source = gtk_drag_source_new ();
gtk_drag_source_set_actions (source, GDK_ACTION_MOVE);
g_signal_connect (source, "prepare", G_CALLBACK (prepare), NULL);
g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin), NULL);
g_signal_connect (source, "drag-end", G_CALLBACK (drag_end), NULL);
g_signal_connect (source, "drag-cancel", G_CALLBACK (drag_cancel), NULL);
gtk_widget_add_controller (canvas, GTK_EVENT_CONTROLLER (source));
dest = gtk_drop_target_new (GTK_TYPE_WIDGET, GDK_ACTION_MOVE);
g_signal_connect (dest, "drop", G_CALLBACK (drag_drop), NULL);
gtk_widget_add_controller (canvas, GTK_EVENT_CONTROLLER (dest));
return canvas;
}
static void
set_color (GtkWidget *item,
GdkRGBA *color)
{
char *css;
char *str;
GtkStyleContext *context;
GtkCssProvider *provider;
str = gdk_rgba_to_string (color);
css = g_strdup_printf ("* { background: %s; padding: 10px; }", str);
context = gtk_widget_get_style_context (item);
provider = g_object_get_data (G_OBJECT (context), "style-provider");
if (provider)
gtk_style_context_remove_provider (context, GTK_STYLE_PROVIDER (provider));
provider = gtk_css_provider_new ();
gtk_css_provider_load_from_data (provider, css, -1);
gtk_style_context_add_provider (gtk_widget_get_style_context (item), GTK_STYLE_PROVIDER (provider), 800);
g_object_set_data_full (G_OBJECT (context), "style-provider", provider, g_object_unref);
g_free (str);
g_free (css);
}
static gboolean
item_drag_drop (GtkDropTarget *dest,
const GValue *value,
double x,
double y)
{
GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (dest));
set_color (item, g_value_get_boxed (value));
return TRUE;
}
static void
angle_changed (GtkGestureRotate *gesture,
double angle,
double delta)
{
GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
TransformData *data = g_object_get_data (G_OBJECT (item), "transform-data");
data->delta = angle / M_PI * 180.0;
apply_transform (item);
}
static void
rotate_done (GtkGesture *gesture)
{
GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
TransformData *data = g_object_get_data (G_OBJECT (item), "transform-data");
data->angle = data->angle + data->delta;
data->delta = 0;
}
static void
click_done (GtkGesture *gesture)
{
GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
GtkWidget *canvas = gtk_widget_get_parent (item);
GtkWidget *last_child;
last_child = gtk_widget_get_last_child (canvas);
if (item != last_child)
gtk_widget_insert_after (item, canvas, last_child);
}
static GtkWidget *
canvas_item_new (int i,
double x,
double y,
double angle)
{
GtkWidget *widget;
char *label;
char *id;
TransformData *transform_data;
GdkRGBA rgba;
GtkDropTarget *dest;
GtkGesture *gesture;
label = g_strdup_printf ("Item %d", i);
id = g_strdup_printf ("item%d", i);
gdk_rgba_parse (&rgba, "yellow");
widget = gtk_label_new (label);
gtk_style_context_add_class (gtk_widget_get_style_context (widget), "frame");
gtk_widget_set_name (widget, id);
set_color (widget, &rgba);
transform_data = g_new0 (TransformData, 1);
transform_data->x = x;
transform_data->y = y;
transform_data->angle = angle;
g_object_set_data_full (G_OBJECT (widget), "transform-data", transform_data, g_free);
g_free (label);
g_free (id);
dest = gtk_drop_target_new (GDK_TYPE_RGBA, GDK_ACTION_COPY);
g_signal_connect (dest, "drop", G_CALLBACK (item_drag_drop), NULL);
gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (dest));
gesture = gtk_gesture_rotate_new ();
g_signal_connect (gesture, "angle-changed", G_CALLBACK (angle_changed), NULL);
g_signal_connect (gesture, "end", G_CALLBACK (rotate_done), NULL);
gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (gesture));
gesture = gtk_gesture_click_new ();
g_signal_connect (gesture, "released", G_CALLBACK (click_done), NULL);
gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (gesture));
return widget;
}
int main (int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *sw;
GtkWidget *canvas;
GtkWidget *widget;
GtkWidget *box, *box2, *box3;
const char *colors[] = {
"red", "green", "blue", "magenta", "orange", "gray", "black", "yellow",
"white", "gray", "brown", "pink", "cyan", "bisque", "gold", "maroon",
"navy", "orchid", "olive", "peru", "salmon", "silver", "wheat",
NULL
};
int i;
int x, y;
gtk_init ();
widget = gtk_color_button_new ();
gtk_widget_destroy (widget);
window = gtk_window_new ();
gtk_window_set_default_size (GTK_WINDOW (window), 640, 480);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_add (GTK_CONTAINER (window), box);
box2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
gtk_container_add (GTK_CONTAINER (box), box2);
canvas = canvas_new ();
gtk_container_add (GTK_CONTAINER (box2), canvas);
x = y = 40;
for (i = 0; i < 4; i++)
{
GtkWidget *item;
item = canvas_item_new (i, x, y, 0);
gtk_container_add (GTK_CONTAINER (canvas), item);
apply_transform (item);
x += 150;
y += 100;
}
sw = gtk_scrolled_window_new (NULL, NULL);
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_NEVER);
gtk_container_add (GTK_CONTAINER (box), sw);
box3 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
gtk_style_context_add_class (gtk_widget_get_style_context (box3), "linked");
gtk_container_add (GTK_CONTAINER (sw), box3);
for (i = 0; colors[i]; i++)
{
GdkRGBA rgba;
GtkWidget *swatch;
gdk_rgba_parse (&rgba, colors[i]);
swatch = g_object_new (g_type_from_name ("GtkColorSwatch"),
"rgba", &rgba,
"selectable", FALSE,
NULL);
gtk_container_add (GTK_CONTAINER (box3), swatch);
}
gtk_widget_show (window);
while (TRUE)
g_main_context_iteration (NULL, TRUE);
return 0;
}