gtk2/demos/gtk-demo/dnd.c
Matthias Clasen 5f6d072459 gtk-demo: Fix the dnd demo drop highlight
We want the drop highlight to be around the label,
not around the item containing it, so move the drop
target gesture to the right widget.
2020-05-22 18:52:56 -04:00

618 lines
17 KiB
C

/* Drag-and-Drop
*
* This demo shows dragging colors and widgets.
* The items in this demo can be moved, recolored
* and rotated.
*/
#include <gtk/gtk.h>
G_DECLARE_FINAL_TYPE (CanvasItem, canvas_item, CANVAS, ITEM, GtkWidget)
struct _CanvasItem {
GtkWidget parent;
GtkWidget *fixed;
GtkWidget *label;
double r;
double angle;
double delta;
GtkWidget *editor;
};
struct _CanvasItemClass {
GtkWidgetClass parent_class;
};
G_DEFINE_TYPE (CanvasItem, canvas_item, GTK_TYPE_WIDGET)
static int n_items = 0;
static void
set_color (CanvasItem *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; margin: 1px; }", str);
context = gtk_widget_get_style_context (item->label);
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->label), 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 *label = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (dest));
CanvasItem *item = CANVAS_ITEM (gtk_widget_get_parent (gtk_widget_get_parent (label)));
set_color (item, g_value_get_boxed (value));
return TRUE;
}
static void
apply_transform (CanvasItem *item)
{
GskTransform *transform;
double x, y;
x = gtk_widget_get_allocated_width (item->label) / 2.0;
y = gtk_widget_get_allocated_height (item->label) / 2.0;
item->r = sqrt (x*x + y*y);
transform = gsk_transform_translate (
gsk_transform_rotate (
gsk_transform_translate (NULL,
&(graphene_point_t) { item->r, item->r }),
item->angle + item->delta),
&(graphene_point_t) { - x, - y });
gtk_fixed_set_child_transform (GTK_FIXED (item->fixed), item->label, transform);
gsk_transform_unref (transform);
}
static void
angle_changed (GtkGestureRotate *gesture,
double angle,
double delta)
{
CanvasItem *item = CANVAS_ITEM (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)));
item->delta = angle / M_PI * 180.0;
apply_transform (item);
}
static void
rotate_done (GtkGesture *gesture)
{
CanvasItem *item = CANVAS_ITEM (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)));
item->angle = item->angle + item->delta;
item->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 void
canvas_item_init (CanvasItem *item)
{
char *text;
char *id;
GdkRGBA rgba;
GtkDropTarget *dest;
GtkGesture *gesture;
n_items++;
text = g_strdup_printf ("Item %d", n_items);
item->label = gtk_label_new (text);
g_free (text);
item->fixed = gtk_fixed_new ();
gtk_widget_set_parent (item->fixed, GTK_WIDGET (item));
gtk_fixed_put (GTK_FIXED (item->fixed), item->label, 0, 0);
gtk_widget_add_css_class (item->label, "frame");
id = g_strdup_printf ("item%d", n_items);
gtk_widget_set_name (item->label, id);
g_free (id);
gdk_rgba_parse (&rgba, "yellow");
set_color (item, &rgba);
item->angle = 0;
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 (GTK_WIDGET (item->label), 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 (GTK_WIDGET (item), GTK_EVENT_CONTROLLER (gesture));
gesture = gtk_gesture_click_new ();
g_signal_connect (gesture, "released", G_CALLBACK (click_done), NULL);
gtk_widget_add_controller (GTK_WIDGET (item), GTK_EVENT_CONTROLLER (gesture));
}
static void
canvas_item_dispose (GObject *object)
{
CanvasItem *item = CANVAS_ITEM (object);
g_clear_pointer (&item->fixed, gtk_widget_unparent);
g_clear_pointer (&item->editor, gtk_widget_unparent);
G_OBJECT_CLASS (canvas_item_parent_class)->dispose (object);
}
static void
canvas_item_map (GtkWidget *widget)
{
CanvasItem *item = CANVAS_ITEM (widget);
GTK_WIDGET_CLASS (canvas_item_parent_class)->map (widget);
apply_transform (item);
}
static void
canvas_item_class_init (CanvasItemClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
object_class->dispose = canvas_item_dispose;
widget_class->map = canvas_item_map;
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
gtk_widget_class_set_css_name (widget_class, "item");
}
static GtkWidget *
canvas_item_new (void)
{
CanvasItem *item = g_object_new (canvas_item_get_type (), NULL);
return GTK_WIDGET (item);
}
static GdkPaintable *
canvas_item_get_drag_icon (CanvasItem *item)
{
return gtk_widget_paintable_new (item->fixed);
}
static gboolean
canvas_item_is_editing (CanvasItem *item)
{
return item->editor != NULL;
}
static void
scale_changed (GtkRange *range,
CanvasItem *item)
{
item->angle = gtk_range_get_value (range);
apply_transform (item);
}
static void
text_changed (GtkEditable *editable,
GParamSpec *pspec,
CanvasItem *item)
{
gtk_label_set_text (GTK_LABEL (item->label), gtk_editable_get_text (editable));
apply_transform (item);
}
static void
canvas_item_stop_editing (CanvasItem *item)
{
GtkWidget *scale;
if (!item->editor)
return;
scale = gtk_widget_get_last_child (item->editor);
g_signal_handlers_disconnect_by_func (scale, scale_changed, item);
gtk_fixed_remove (GTK_FIXED (gtk_widget_get_parent (item->editor)), item->editor);
item->editor = NULL;
}
static void
canvas_item_start_editing (CanvasItem *item)
{
GtkWidget *canvas = gtk_widget_get_parent (GTK_WIDGET (item));
GtkWidget *entry;
GtkWidget *scale;
double x, y;
if (item->editor)
return;
item->editor = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
entry = gtk_entry_new ();
gtk_editable_set_text (GTK_EDITABLE (entry),
gtk_label_get_text (GTK_LABEL (item->label)));
gtk_editable_set_width_chars (GTK_EDITABLE (entry), 12);
g_signal_connect (entry, "notify::text", G_CALLBACK (text_changed), item);
g_signal_connect_swapped (entry, "activate", G_CALLBACK (canvas_item_stop_editing), item);
gtk_box_append (GTK_BOX (item->editor), entry);
scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 360, 1);
gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
gtk_range_set_value (GTK_RANGE (scale), fmod (item->angle, 360));
g_signal_connect (scale, "value-changed", G_CALLBACK (scale_changed), item);
gtk_box_append (GTK_BOX (item->editor), scale);
gtk_widget_translate_coordinates (GTK_WIDGET (item), canvas, 0, 0, &x, &y);
gtk_fixed_put (GTK_FIXED (canvas), item->editor, x, y + 2 * item->r);
gtk_widget_grab_focus (entry);
}
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);
item = gtk_widget_get_ancestor (item, canvas_item_get_type ());
if (!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;
CanvasItem *item;
GdkPaintable *paintable;
canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
item = CANVAS_ITEM (g_object_get_data (G_OBJECT (canvas), "dragged-item"));
paintable = canvas_item_get_drag_icon (item);
gtk_drag_source_set_icon (source, paintable, item->r, item->r);
g_object_unref (paintable);
gtk_widget_set_opacity (GTK_WIDGET (item), 0.3);
}
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 gboolean
drag_cancel (GtkDragSource *source,
GdkDrag *drag,
GdkDragCancelReason reason)
{
return FALSE;
}
static gboolean
drag_drop (GtkDropTarget *target,
const GValue *value,
double x,
double y)
{
CanvasItem *item;
GtkWidget *canvas;
GtkWidget *last_child;
item = g_value_get_object (value);
canvas = gtk_widget_get_parent (GTK_WIDGET (item));
last_child = gtk_widget_get_last_child (canvas);
if (GTK_WIDGET (item) != last_child)
gtk_widget_insert_after (GTK_WIDGET (item), canvas, last_child);
gtk_fixed_move (GTK_FIXED (canvas), GTK_WIDGET (item), x - item->r, y - item->r);
return TRUE;
}
static void
new_item_cb (GtkWidget *button, gpointer data)
{
GtkWidget *canvas = data;
GtkWidget *popover;
GtkWidget *item;
GdkRectangle rect;
popover = gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER);
gtk_popover_get_pointing_to (GTK_POPOVER (popover), &rect);
item = canvas_item_new ();
gtk_fixed_put (GTK_FIXED (canvas), item, rect.x, rect.y);
apply_transform (CANVAS_ITEM (item));
gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
}
static void
edit_cb (GtkWidget *button, GtkWidget *child)
{
CanvasItem *item = CANVAS_ITEM (child);
if (button)
gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
if (!canvas_item_is_editing (item))
canvas_item_start_editing (item);
}
static void
delete_cb (GtkWidget *button, GtkWidget *child)
{
GtkWidget *canvas = gtk_widget_get_parent (child);
gtk_fixed_remove (GTK_FIXED (canvas), child);
gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
}
static void
pressed_cb (GtkGesture *gesture,
int n_press,
double x,
double y,
gpointer data)
{
GtkWidget *widget;
GtkWidget *child;
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
child = gtk_widget_pick (widget, x, y, GTK_PICK_DEFAULT);
child = gtk_widget_get_ancestor (child, canvas_item_get_type ());
if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_SECONDARY)
{
GtkWidget *menu;
GtkWidget *box;
GtkWidget *item;
menu = gtk_popover_new ();
gtk_widget_set_parent (menu, widget);
gtk_popover_set_has_arrow (GTK_POPOVER (menu), FALSE);
gtk_popover_set_pointing_to (GTK_POPOVER (menu), &(GdkRectangle){ x, y, 1, 1});
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_popover_set_child (GTK_POPOVER (menu), box);
item = gtk_button_new_with_label ("New");
gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
g_signal_connect (item, "clicked", G_CALLBACK (new_item_cb), widget);
gtk_box_append (GTK_BOX (box), item);
item = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
gtk_box_append (GTK_BOX (box), item);
item = gtk_button_new_with_label ("Edit");
gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
gtk_widget_set_sensitive (item, child != NULL && child != widget);
g_signal_connect (item, "clicked", G_CALLBACK (edit_cb), child);
gtk_box_append (GTK_BOX (box), item);
item = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
gtk_box_append (GTK_BOX (box), item);
item = gtk_button_new_with_label ("Delete");
gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
gtk_widget_set_sensitive (item, child != NULL && child != widget);
g_signal_connect (item, "clicked", G_CALLBACK (delete_cb), child);
gtk_box_append (GTK_BOX (box), item);
gtk_popover_popup (GTK_POPOVER (menu));
}
}
static void
released_cb (GtkGesture *gesture,
int n_press,
double x,
double y,
gpointer data)
{
GtkWidget *widget;
GtkWidget *child;
CanvasItem *item;
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
child = gtk_widget_pick (widget, x, y, 0);
item = (CanvasItem *)gtk_widget_get_ancestor (child, canvas_item_get_type ());
if (!item)
return;
if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_PRIMARY)
{
if (canvas_item_is_editing (item))
canvas_item_stop_editing (item);
else
canvas_item_start_editing (item);
}
}
static GtkWidget *
canvas_new (void)
{
GtkWidget *canvas;
GtkDragSource *source;
GtkDropTarget *dest;
GtkGesture *gesture;
canvas = gtk_fixed_new ();
gtk_widget_set_hexpand (canvas, TRUE);
gtk_widget_set_vexpand (canvas, TRUE);
gtk_widget_add_css_class (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));
gesture = gtk_gesture_click_new ();
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), 0);
g_signal_connect (gesture, "pressed", G_CALLBACK (pressed_cb), NULL);
g_signal_connect (gesture, "released", G_CALLBACK (released_cb), NULL);
gtk_widget_add_controller (canvas, GTK_EVENT_CONTROLLER (gesture));
return canvas;
}
static GtkWidget *window = NULL;
GtkWidget *
do_dnd (GtkWidget *do_widget)
{
if (!window)
{
GtkWidget *button;
GtkWidget *sw;
GtkWidget *canvas;
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;
button = gtk_color_button_new ();
g_object_unref (g_object_ref_sink (button));
window = gtk_window_new ();
gtk_window_set_display (GTK_WINDOW (window),
gtk_widget_get_display (do_widget));
gtk_window_set_title (GTK_WINDOW (window), "Drag-and-Drop");
gtk_window_set_default_size (GTK_WINDOW (window), 640, 480);
g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_window_set_child (GTK_WINDOW (window), box);
box2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
gtk_box_append (GTK_BOX (box), box2);
canvas = canvas_new ();
gtk_box_append (GTK_BOX (box2), canvas);
n_items = 0;
x = y = 40;
for (i = 0; i < 4; i++)
{
GtkWidget *item;
item = canvas_item_new ();
gtk_fixed_put (GTK_FIXED (canvas), item, x, y);
apply_transform (CANVAS_ITEM (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_box_append (GTK_BOX (box), sw);
box3 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
gtk_widget_add_css_class (box3, "linked");
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (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_box_append (GTK_BOX (box3), swatch);
}
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_window_destroy (GTK_WINDOW (window));
return window;
}