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Implement a more convenient drag and drop

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This commit is contained in:
Mario Hüttel
2019-03-13 20:22:11 +01:00
parent e24b4a8367
commit 658e681c38
5 changed files with 300 additions and 40 deletions
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70
widgets/layer-element.c
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@@ -17,9 +17,16 @@
* along with GDSII-Converter. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* The drag and drop implementation is adapted from
* https://gitlab.gnome.org/GNOME/gtk/blob/gtk-3-22/tests/testlist3.c
*
* Thanks to the GTK3 people for creating these examples.
*/
/**
* @file layer-element.c
* @brief Omplementation of the layer element used for configuring layer colors etc.
* @brief Implementation of the layer element used for configuring layer colors etc.
* @author Mario Hüttel <mario.huettel@gmx.net>
*/
@@ -65,14 +72,14 @@ static void layer_element_drag_begin(GtkWidget *widget,
int x, y;
(void)data;
row = gtk_widget_get_ancestor (widget, GTK_TYPE_LIST_BOX_ROW);
gtk_widget_get_allocation (row, &alloc);
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, alloc.width, alloc.height);
cr = cairo_create (surface);
row = gtk_widget_get_ancestor(widget, GTK_TYPE_LIST_BOX_ROW);
gtk_widget_get_allocation(row, &alloc);
surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, alloc.width, alloc.height);
cr = cairo_create(surface);
gtk_style_context_add_class (gtk_widget_get_style_context (row), "drag-icon");
gtk_style_context_add_class (gtk_widget_get_style_context(row), "drag-icon");
gtk_widget_draw (row, cr);
gtk_style_context_remove_class (gtk_widget_get_style_context (row), "drag-icon");
gtk_style_context_remove_class(gtk_widget_get_style_context(row), "drag-icon");
gtk_widget_translate_coordinates (widget, row, 0, 0, &x, &y);
cairo_surface_set_device_offset (surface, -x, -y);
@@ -80,6 +87,21 @@ static void layer_element_drag_begin(GtkWidget *widget,
cairo_destroy (cr);
cairo_surface_destroy (surface);
g_object_set_data(G_OBJECT(gtk_widget_get_parent(row)), "drag-row", row);
gtk_style_context_add_class(gtk_widget_get_style_context(row), "drag-row");
}
static void layer_element_drag_end(GtkWidget *widget, GdkDragContext *context, gpointer data)
{
GtkWidget *row;
(void)context;
(void)data;
row = gtk_widget_get_ancestor(widget, GTK_TYPE_LIST_BOX_ROW);
g_object_set_data(G_OBJECT(gtk_widget_get_parent(row)), "drag-row", NULL);
gtk_style_context_remove_class(gtk_widget_get_style_context(row), "drag-row");
gtk_style_context_remove_class(gtk_widget_get_style_context(row), "drag-hover");
}
static void layer_element_drag_data_get(GtkWidget *widget, GdkDragContext *context, GtkSelectionData *selection_data,
@@ -94,36 +116,6 @@ static void layer_element_drag_data_get(GtkWidget *widget, GdkDragContext *conte
32, (const guchar *)&widget, sizeof(gpointer));
}
static void layer_element_drag_data_received(GtkWidget *widget, GdkDragContext *context, gint x, gint y,
GtkSelectionData *selection_data, guint info, guint32 time,
gpointer data)
{
GtkWidget *target;
GtkWidget *row;
GtkWidget *source;
int pos;
(void)context;
(void)x;
(void)y;
(void)info;
(void)time;
(void)data;
target = widget;
pos = gtk_list_box_row_get_index (GTK_LIST_BOX_ROW (target));
row = (gpointer)(*(gpointer *)gtk_selection_data_get_data(selection_data));
source = gtk_widget_get_ancestor (row, GTK_TYPE_LIST_BOX_ROW);
if (source == target)
return;
g_object_ref (source);
gtk_container_remove (GTK_CONTAINER (gtk_widget_get_parent (source)), source);
gtk_list_box_insert (GTK_LIST_BOX (gtk_widget_get_parent (target)), source, pos);
g_object_unref (source);
}
static void layer_element_init(LayerElement *self)
{
GtkBuilder *builder;
@@ -140,11 +132,11 @@ static void layer_element_init(LayerElement *self)
self->priv.event_handle = GTK_EVENT_BOX(gtk_builder_get_object(builder, "event-box"));
/* Setup drag and drop */
gtk_style_context_add_class (gtk_widget_get_style_context(GTK_WIDGET(self)), "row");
gtk_drag_source_set(GTK_WIDGET(self->priv.event_handle), GDK_BUTTON1_MASK, entries, 1, GDK_ACTION_MOVE);
g_signal_connect(self->priv.event_handle, "drag-begin", G_CALLBACK(layer_element_drag_begin), NULL);
g_signal_connect(self->priv.event_handle, "drag-data-get", G_CALLBACK(layer_element_drag_data_get), NULL);
gtk_drag_dest_set(GTK_WIDGET(self), GTK_DEST_DEFAULT_ALL, entries, 1, GDK_ACTION_MOVE);
g_signal_connect(GTK_WIDGET(self), "drag-data-received", G_CALLBACK(layer_element_drag_data_received), NULL);
g_signal_connect(self->priv.event_handle, "drag-end", G_CALLBACK(layer_element_drag_end), NULL);
g_object_unref(builder);
}