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Redo the listbox dnd example

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Rewrite this example to have better drag highlighting.
This commit is contained in:
Matthias Clasen
2017-05-25 21:57:24 -04:00
parent 3850574146
commit 6b3f2131c5
1 changed files with 198 additions and 13 deletions
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211
tests/testlist3.c
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@ -20,9 +20,9 @@ drag_begin (GtkWidget *widget,
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), "during-dnd");
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), "during-dnd");
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);
@ -30,8 +30,23 @@ 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
drag_end (GtkWidget *widget,
GdkDragContext *context,
gpointer data)
{
GtkWidget *row;
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");
}
void
drag_data_get (GtkWidget *widget,
@ -48,6 +63,39 @@ drag_data_get (GtkWidget *widget,
sizeof (gpointer));
}
static GtkListBoxRow *
get_last_row (GtkListBox *list)
{
int i;
GtkListBoxRow *row;
row = NULL;
for (i = 0; ; i++)
{
GtkListBoxRow *tmp;
tmp = gtk_list_box_get_row_at_index (list, i);
if (tmp == NULL)
return row;
row = tmp;
}
return row;
}
static GtkListBoxRow *
get_row_before (GtkListBox *list,
GtkListBoxRow *row)
{
int pos = gtk_list_box_row_get_index (row);
return gtk_list_box_get_row_at_index (list, pos - 1);
}
static GtkListBoxRow *
get_row_after (GtkListBox *list,
GtkListBoxRow *row)
{
int pos = gtk_list_box_row_get_index (row);
return gtk_list_box_get_row_at_index (list, pos + 1);
}
static void
drag_data_received (GtkWidget *widget,
@ -59,32 +107,134 @@ drag_data_received (GtkWidget *widget,
guint32 time,
gpointer data)
{
GtkWidget *target;
GtkWidget *row_before;
GtkWidget *row_after;
GtkWidget *row;
GtkWidget *source;
int pos;
target = widget;
row_before = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "row-before"));
row_after = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "row-after"));
g_object_set_data (G_OBJECT (widget), "row-before", NULL);
g_object_set_data (G_OBJECT (widget), "row-after", NULL);
if (row_before)
gtk_style_context_remove_class (gtk_widget_get_style_context (row_before), "drag-hover-bottom");
if (row_after)
gtk_style_context_remove_class (gtk_widget_get_style_context (row_after), "drag-hover-top");
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)
if (source == row_after)
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);
if (row_after)
pos = gtk_list_box_row_get_index (GTK_LIST_BOX_ROW (row_after));
else
pos = gtk_list_box_row_get_index (GTK_LIST_BOX_ROW (row_before)) + 1;
gtk_list_box_insert (GTK_LIST_BOX (widget), source, pos);
g_object_unref (source);
}
static gboolean
drag_motion (GtkWidget *widget,
GdkDragContext *context,
int x,
int y,
guint time)
{
GtkAllocation alloc;
GtkWidget *row;
int hover_row_y;
int hover_row_height;
GtkWidget *drag_row;
GtkWidget *row_before;
GtkWidget *row_after;
row = GTK_WIDGET (gtk_list_box_get_row_at_y (GTK_LIST_BOX (widget), y));
drag_row = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "drag-row"));
row_before = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "row-before"));
row_after = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "row-after"));
gtk_style_context_remove_class (gtk_widget_get_style_context (drag_row), "drag-hover");
if (row_before)
gtk_style_context_remove_class (gtk_widget_get_style_context (row_before), "drag-hover-bottom");
if (row_after)
gtk_style_context_remove_class (gtk_widget_get_style_context (row_after), "drag-hover-top");
if (row)
{
gtk_widget_get_allocation (row, &alloc);
hover_row_y = alloc.y;
hover_row_height = alloc.height;
if (y < hover_row_y + hover_row_height/2)
{
row_after = row;
row_before = GTK_WIDGET (get_row_before (GTK_LIST_BOX (widget), GTK_LIST_BOX_ROW (row)));
}
else
{
row_before = row;
row_after = GTK_WIDGET (get_row_after (GTK_LIST_BOX (widget), GTK_LIST_BOX_ROW (row)));
}
}
else
{
row_before = GTK_WIDGET (get_last_row (GTK_LIST_BOX (widget)));
row_after = NULL;
}
g_object_set_data (G_OBJECT (widget), "row-before", row_before);
g_object_set_data (G_OBJECT (widget), "row-after", row_after);
if (drag_row == row_before || drag_row == row_after)
{
gtk_style_context_add_class (gtk_widget_get_style_context (drag_row), "drag-hover");
return FALSE;
}
if (row_before)
gtk_style_context_add_class (gtk_widget_get_style_context (row_before), "drag-hover-bottom");
if (row_after)
gtk_style_context_add_class (gtk_widget_get_style_context (row_after), "drag-hover-top");
return TRUE;
}
static void
drag_leave (GtkWidget *widget,
GdkDragContext *context,
guint time)
{
GtkWidget *drag_row;
GtkWidget *row_before;
GtkWidget *row_after;
drag_row = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "drag-row"));
row_before = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "row-before"));
row_after = GTK_WIDGET (g_object_get_data (G_OBJECT (widget), "row-after"));
gtk_style_context_remove_class (gtk_widget_get_style_context (drag_row), "drag-hover");
if (row_before)
gtk_style_context_remove_class (gtk_widget_get_style_context (row_before), "drag-hover-bottom");
if (row_after)
gtk_style_context_remove_class (gtk_widget_get_style_context (row_after), "drag-hover-top");
}
static GtkWidget *
create_row (const gchar *text)
{
GtkWidget *row, *ebox, *box, *label, *image;
row = gtk_list_box_row_new ();
row = gtk_list_box_row_new ();
ebox = gtk_event_box_new ();
image = gtk_image_new_from_icon_name ("open-menu-symbolic", 1);
gtk_container_add (GTK_CONTAINER (ebox), image);
@ -95,13 +245,12 @@ create_row (const gchar *text)
gtk_box_pack_start (GTK_BOX (box), label, TRUE, FALSE, 0);
gtk_container_add (GTK_CONTAINER (box), ebox);
gtk_style_context_add_class (gtk_widget_get_style_context (row), "row");
gtk_drag_source_set (ebox, GDK_BUTTON1_MASK, entries, 1, GDK_ACTION_MOVE);
g_signal_connect (ebox, "drag-begin", G_CALLBACK (drag_begin), NULL);
g_signal_connect (ebox, "drag-end", G_CALLBACK (drag_end), NULL);
g_signal_connect (ebox, "drag-data-get", G_CALLBACK (drag_data_get), NULL);
gtk_drag_dest_set (row, GTK_DEST_DEFAULT_ALL, entries, 1, GDK_ACTION_MOVE);
g_signal_connect (row, "drag-data-received", G_CALLBACK (drag_data_received), NULL);
return row;
}
@ -135,10 +284,41 @@ selection_mode_changed (GtkComboBox *combo, gpointer data)
}
static const char *css =
".during-dnd { "
".row:not(:first-child) { "
" border-top: 1px solid alpha(gray,0.5); "
" border-bottom: 1px solid transparent; "
"}"
".row:first-child { "
" border-top: 1px solid transparent; "
" border-bottom: 1px solid transparent; "
"}"
".row:last-child { "
" border-top: 1px solid alpha(gray,0.5); "
" border-bottom: 1px solid alpha(gray,0.5); "
"}"
".row.drag-icon { "
" background: white; "
" border: 1px solid black; "
"}";
"}"
".row.drag-row { "
" color: gray; "
" background: alpha(gray,0.2); "
"}"
".row.drag-row.drag-hover { "
" border-top: 1px solid #4e9a06; "
" border-bottom: 1px solid #4e9a06; "
"}"
".row.drag-hover image, "
".row.drag-hover label { "
" color: #4e9a06; "
"}"
".row.drag-hover-top {"
" border-top: 1px solid #4e9a06; "
"}"
".row.drag-hover-bottom {"
" border-bottom: 1px solid #4e9a06; "
"}"
;
int
main (int argc, char *argv[])
@ -166,6 +346,11 @@ main (int argc, char *argv[])
list = gtk_list_box_new ();
gtk_list_box_set_selection_mode (GTK_LIST_BOX (list), GTK_SELECTION_NONE);
gtk_drag_dest_set (list, GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_DROP, entries, 1, GDK_ACTION_MOVE);
g_signal_connect (list, "drag-data-received", G_CALLBACK (drag_data_received), NULL);
g_signal_connect (list, "drag-motion", G_CALLBACK (drag_motion), NULL);
g_signal_connect (list, "drag-leave", G_CALLBACK (drag_leave), NULL);
g_signal_connect (list, "row-activated", G_CALLBACK (on_row_activated), NULL);
g_signal_connect (list, "selected-rows-changed", G_CALLBACK (on_selected_children_changed), NULL);
g_signal_connect (gtk_widget_get_accessible (list), "selection-changed", G_CALLBACK (a11y_selection_changed), NULL);