mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-12-28 06:21:14 +00:00
5f6d072459
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.
618 lines
17 KiB
C
618 lines
17 KiB
C
/* Drag-and-Drop
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*
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* This demo shows dragging colors and widgets.
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* The items in this demo can be moved, recolored
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* and rotated.
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*/
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#include <gtk/gtk.h>
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G_DECLARE_FINAL_TYPE (CanvasItem, canvas_item, CANVAS, ITEM, GtkWidget)
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struct _CanvasItem {
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GtkWidget parent;
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GtkWidget *fixed;
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GtkWidget *label;
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double r;
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double angle;
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double delta;
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GtkWidget *editor;
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};
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struct _CanvasItemClass {
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GtkWidgetClass parent_class;
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};
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G_DEFINE_TYPE (CanvasItem, canvas_item, GTK_TYPE_WIDGET)
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static int n_items = 0;
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static void
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set_color (CanvasItem *item,
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GdkRGBA *color)
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{
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char *css;
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char *str;
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GtkStyleContext *context;
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GtkCssProvider *provider;
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str = gdk_rgba_to_string (color);
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css = g_strdup_printf ("* { background: %s; padding: 10px; margin: 1px; }", str);
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context = gtk_widget_get_style_context (item->label);
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provider = g_object_get_data (G_OBJECT (context), "style-provider");
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if (provider)
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gtk_style_context_remove_provider (context, GTK_STYLE_PROVIDER (provider));
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provider = gtk_css_provider_new ();
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gtk_css_provider_load_from_data (provider, css, -1);
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gtk_style_context_add_provider (gtk_widget_get_style_context (item->label), GTK_STYLE_PROVIDER (provider), 800);
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g_object_set_data_full (G_OBJECT (context), "style-provider", provider, g_object_unref);
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g_free (str);
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g_free (css);
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}
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static gboolean
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item_drag_drop (GtkDropTarget *dest,
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const GValue *value,
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double x,
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double y)
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{
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GtkWidget *label = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (dest));
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CanvasItem *item = CANVAS_ITEM (gtk_widget_get_parent (gtk_widget_get_parent (label)));
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set_color (item, g_value_get_boxed (value));
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return TRUE;
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}
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static void
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apply_transform (CanvasItem *item)
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{
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GskTransform *transform;
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double x, y;
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x = gtk_widget_get_allocated_width (item->label) / 2.0;
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y = gtk_widget_get_allocated_height (item->label) / 2.0;
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item->r = sqrt (x*x + y*y);
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transform = gsk_transform_translate (
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gsk_transform_rotate (
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gsk_transform_translate (NULL,
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&(graphene_point_t) { item->r, item->r }),
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item->angle + item->delta),
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&(graphene_point_t) { - x, - y });
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gtk_fixed_set_child_transform (GTK_FIXED (item->fixed), item->label, transform);
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gsk_transform_unref (transform);
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}
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static void
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angle_changed (GtkGestureRotate *gesture,
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double angle,
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double delta)
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{
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CanvasItem *item = CANVAS_ITEM (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)));
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item->delta = angle / M_PI * 180.0;
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apply_transform (item);
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}
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static void
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rotate_done (GtkGesture *gesture)
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{
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CanvasItem *item = CANVAS_ITEM (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture)));
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item->angle = item->angle + item->delta;
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item->delta = 0;
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}
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static void
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click_done (GtkGesture *gesture)
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{
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GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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GtkWidget *canvas = gtk_widget_get_parent (item);
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GtkWidget *last_child;
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last_child = gtk_widget_get_last_child (canvas);
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if (item != last_child)
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gtk_widget_insert_after (item, canvas, last_child);
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}
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static void
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canvas_item_init (CanvasItem *item)
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{
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char *text;
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char *id;
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GdkRGBA rgba;
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GtkDropTarget *dest;
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GtkGesture *gesture;
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n_items++;
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text = g_strdup_printf ("Item %d", n_items);
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item->label = gtk_label_new (text);
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g_free (text);
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item->fixed = gtk_fixed_new ();
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gtk_widget_set_parent (item->fixed, GTK_WIDGET (item));
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gtk_fixed_put (GTK_FIXED (item->fixed), item->label, 0, 0);
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gtk_widget_add_css_class (item->label, "frame");
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id = g_strdup_printf ("item%d", n_items);
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gtk_widget_set_name (item->label, id);
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g_free (id);
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gdk_rgba_parse (&rgba, "yellow");
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set_color (item, &rgba);
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item->angle = 0;
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dest = gtk_drop_target_new (GDK_TYPE_RGBA, GDK_ACTION_COPY);
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g_signal_connect (dest, "drop", G_CALLBACK (item_drag_drop), NULL);
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gtk_widget_add_controller (GTK_WIDGET (item->label), GTK_EVENT_CONTROLLER (dest));
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gesture = gtk_gesture_rotate_new ();
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g_signal_connect (gesture, "angle-changed", G_CALLBACK (angle_changed), NULL);
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g_signal_connect (gesture, "end", G_CALLBACK (rotate_done), NULL);
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gtk_widget_add_controller (GTK_WIDGET (item), GTK_EVENT_CONTROLLER (gesture));
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gesture = gtk_gesture_click_new ();
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g_signal_connect (gesture, "released", G_CALLBACK (click_done), NULL);
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gtk_widget_add_controller (GTK_WIDGET (item), GTK_EVENT_CONTROLLER (gesture));
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}
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static void
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canvas_item_dispose (GObject *object)
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{
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CanvasItem *item = CANVAS_ITEM (object);
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g_clear_pointer (&item->fixed, gtk_widget_unparent);
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g_clear_pointer (&item->editor, gtk_widget_unparent);
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G_OBJECT_CLASS (canvas_item_parent_class)->dispose (object);
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}
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static void
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canvas_item_map (GtkWidget *widget)
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{
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CanvasItem *item = CANVAS_ITEM (widget);
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GTK_WIDGET_CLASS (canvas_item_parent_class)->map (widget);
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apply_transform (item);
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}
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static void
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canvas_item_class_init (CanvasItemClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->dispose = canvas_item_dispose;
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widget_class->map = canvas_item_map;
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gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
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gtk_widget_class_set_css_name (widget_class, "item");
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}
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static GtkWidget *
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canvas_item_new (void)
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{
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CanvasItem *item = g_object_new (canvas_item_get_type (), NULL);
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return GTK_WIDGET (item);
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}
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static GdkPaintable *
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canvas_item_get_drag_icon (CanvasItem *item)
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{
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return gtk_widget_paintable_new (item->fixed);
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}
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static gboolean
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canvas_item_is_editing (CanvasItem *item)
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{
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return item->editor != NULL;
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}
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static void
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scale_changed (GtkRange *range,
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CanvasItem *item)
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{
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item->angle = gtk_range_get_value (range);
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apply_transform (item);
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}
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static void
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text_changed (GtkEditable *editable,
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GParamSpec *pspec,
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CanvasItem *item)
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{
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gtk_label_set_text (GTK_LABEL (item->label), gtk_editable_get_text (editable));
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apply_transform (item);
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}
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static void
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canvas_item_stop_editing (CanvasItem *item)
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{
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GtkWidget *scale;
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if (!item->editor)
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return;
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scale = gtk_widget_get_last_child (item->editor);
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g_signal_handlers_disconnect_by_func (scale, scale_changed, item);
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gtk_fixed_remove (GTK_FIXED (gtk_widget_get_parent (item->editor)), item->editor);
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item->editor = NULL;
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}
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static void
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canvas_item_start_editing (CanvasItem *item)
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{
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GtkWidget *canvas = gtk_widget_get_parent (GTK_WIDGET (item));
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GtkWidget *entry;
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GtkWidget *scale;
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double x, y;
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if (item->editor)
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return;
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item->editor = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
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entry = gtk_entry_new ();
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gtk_editable_set_text (GTK_EDITABLE (entry),
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gtk_label_get_text (GTK_LABEL (item->label)));
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gtk_editable_set_width_chars (GTK_EDITABLE (entry), 12);
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g_signal_connect (entry, "notify::text", G_CALLBACK (text_changed), item);
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g_signal_connect_swapped (entry, "activate", G_CALLBACK (canvas_item_stop_editing), item);
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gtk_box_append (GTK_BOX (item->editor), entry);
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scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, 0, 360, 1);
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gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
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gtk_range_set_value (GTK_RANGE (scale), fmod (item->angle, 360));
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g_signal_connect (scale, "value-changed", G_CALLBACK (scale_changed), item);
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gtk_box_append (GTK_BOX (item->editor), scale);
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gtk_widget_translate_coordinates (GTK_WIDGET (item), canvas, 0, 0, &x, &y);
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gtk_fixed_put (GTK_FIXED (canvas), item->editor, x, y + 2 * item->r);
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gtk_widget_grab_focus (entry);
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}
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static GdkContentProvider *
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prepare (GtkDragSource *source,
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double x,
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double y)
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{
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GtkWidget *canvas;
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GtkWidget *item;
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canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
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item = gtk_widget_pick (canvas, x, y, GTK_PICK_DEFAULT);
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item = gtk_widget_get_ancestor (item, canvas_item_get_type ());
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if (!item)
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return NULL;
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g_object_set_data (G_OBJECT (canvas), "dragged-item", item);
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return gdk_content_provider_new_typed (GTK_TYPE_WIDGET, item);
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}
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static void
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drag_begin (GtkDragSource *source,
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GdkDrag *drag)
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{
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GtkWidget *canvas;
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CanvasItem *item;
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GdkPaintable *paintable;
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canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
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item = CANVAS_ITEM (g_object_get_data (G_OBJECT (canvas), "dragged-item"));
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paintable = canvas_item_get_drag_icon (item);
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gtk_drag_source_set_icon (source, paintable, item->r, item->r);
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g_object_unref (paintable);
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gtk_widget_set_opacity (GTK_WIDGET (item), 0.3);
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}
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static void
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drag_end (GtkDragSource *source,
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GdkDrag *drag)
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{
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GtkWidget *canvas;
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GtkWidget *item;
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canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
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item = g_object_get_data (G_OBJECT (canvas), "dragged-item");
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g_object_set_data (G_OBJECT (canvas), "dragged-item", NULL);
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gtk_widget_set_opacity (item, 1.0);
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}
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static gboolean
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drag_cancel (GtkDragSource *source,
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GdkDrag *drag,
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GdkDragCancelReason reason)
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{
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return FALSE;
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}
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static gboolean
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drag_drop (GtkDropTarget *target,
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const GValue *value,
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double x,
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double y)
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{
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CanvasItem *item;
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GtkWidget *canvas;
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GtkWidget *last_child;
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item = g_value_get_object (value);
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canvas = gtk_widget_get_parent (GTK_WIDGET (item));
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last_child = gtk_widget_get_last_child (canvas);
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if (GTK_WIDGET (item) != last_child)
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gtk_widget_insert_after (GTK_WIDGET (item), canvas, last_child);
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gtk_fixed_move (GTK_FIXED (canvas), GTK_WIDGET (item), x - item->r, y - item->r);
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return TRUE;
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}
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static void
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new_item_cb (GtkWidget *button, gpointer data)
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{
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GtkWidget *canvas = data;
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GtkWidget *popover;
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GtkWidget *item;
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GdkRectangle rect;
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popover = gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER);
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gtk_popover_get_pointing_to (GTK_POPOVER (popover), &rect);
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item = canvas_item_new ();
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gtk_fixed_put (GTK_FIXED (canvas), item, rect.x, rect.y);
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apply_transform (CANVAS_ITEM (item));
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gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
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}
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static void
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edit_cb (GtkWidget *button, GtkWidget *child)
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{
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CanvasItem *item = CANVAS_ITEM (child);
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if (button)
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gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
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if (!canvas_item_is_editing (item))
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canvas_item_start_editing (item);
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}
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static void
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delete_cb (GtkWidget *button, GtkWidget *child)
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{
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GtkWidget *canvas = gtk_widget_get_parent (child);
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gtk_fixed_remove (GTK_FIXED (canvas), child);
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gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
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}
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static void
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pressed_cb (GtkGesture *gesture,
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int n_press,
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double x,
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double y,
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gpointer data)
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{
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GtkWidget *widget;
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GtkWidget *child;
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widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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child = gtk_widget_pick (widget, x, y, GTK_PICK_DEFAULT);
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child = gtk_widget_get_ancestor (child, canvas_item_get_type ());
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if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_SECONDARY)
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{
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GtkWidget *menu;
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GtkWidget *box;
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GtkWidget *item;
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menu = gtk_popover_new ();
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gtk_widget_set_parent (menu, widget);
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gtk_popover_set_has_arrow (GTK_POPOVER (menu), FALSE);
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gtk_popover_set_pointing_to (GTK_POPOVER (menu), &(GdkRectangle){ x, y, 1, 1});
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box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_popover_set_child (GTK_POPOVER (menu), box);
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item = gtk_button_new_with_label ("New");
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gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
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g_signal_connect (item, "clicked", G_CALLBACK (new_item_cb), widget);
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gtk_box_append (GTK_BOX (box), item);
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item = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
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gtk_box_append (GTK_BOX (box), item);
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item = gtk_button_new_with_label ("Edit");
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gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
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gtk_widget_set_sensitive (item, child != NULL && child != widget);
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g_signal_connect (item, "clicked", G_CALLBACK (edit_cb), child);
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gtk_box_append (GTK_BOX (box), item);
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item = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
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gtk_box_append (GTK_BOX (box), item);
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item = gtk_button_new_with_label ("Delete");
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gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
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gtk_widget_set_sensitive (item, child != NULL && child != widget);
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g_signal_connect (item, "clicked", G_CALLBACK (delete_cb), child);
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gtk_box_append (GTK_BOX (box), item);
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gtk_popover_popup (GTK_POPOVER (menu));
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}
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}
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static void
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released_cb (GtkGesture *gesture,
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int n_press,
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double x,
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double y,
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gpointer data)
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{
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GtkWidget *widget;
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GtkWidget *child;
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CanvasItem *item;
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widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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child = gtk_widget_pick (widget, x, y, 0);
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item = (CanvasItem *)gtk_widget_get_ancestor (child, canvas_item_get_type ());
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if (!item)
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return;
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if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_PRIMARY)
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{
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if (canvas_item_is_editing (item))
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canvas_item_stop_editing (item);
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else
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canvas_item_start_editing (item);
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}
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}
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static GtkWidget *
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canvas_new (void)
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{
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GtkWidget *canvas;
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|
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;
|
|
}
|