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Diffstat (limited to '')
| -rw-r--r-- | src/nautilus-dnd.c | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/src/nautilus-dnd.c b/src/nautilus-dnd.c new file mode 100644 index 0000000..9663e01 --- /dev/null +++ b/src/nautilus-dnd.c @@ -0,0 +1,317 @@ +/* nautilus-dnd.h - Common Drag & drop handling code + * + * Authors: Pavel Cisler <pavel@eazel.com>, + * Ettore Perazzoli <ettore@gnu.org> + * Copyright (C) 2000, 2001 Eazel, Inc. + * Copyright (C) 2022 The GNOME project contributors + * + * SPDX-License-Identifier: GPL-3.0-or-later + */ + +#include "nautilus-directory.h" +#include "nautilus-dnd.h" +#include "nautilus-file-utilities.h" +#include "nautilus-tag-manager.h" + +static gboolean +check_same_fs (NautilusFile *file1, + NautilusFile *file2) +{ + char *id1, *id2; + gboolean result; + + result = FALSE; + + if (file1 != NULL && file2 != NULL) + { + id1 = nautilus_file_get_filesystem_id (file1); + id2 = nautilus_file_get_filesystem_id (file2); + + if (id1 != NULL && id2 != NULL) + { + result = (strcmp (id1, id2) == 0); + } + + g_free (id1); + g_free (id2); + } + + return result; +} + +static gboolean +source_is_deletable (GFile *file) +{ + NautilusFile *naut_file; + gboolean ret; + + /* if there's no a cached NautilusFile, it returns NULL */ + naut_file = nautilus_file_get (file); + if (naut_file == NULL) + { + return FALSE; + } + + ret = nautilus_file_can_delete (naut_file); + nautilus_file_unref (naut_file); + + return ret; +} + +#if 0 && NAUTILUS_DND_NEEDS_GTK4_REIMPLEMENTATION +static void +append_drop_action_menu_item (GtkWidget *menu, + const char *text, + GdkDragAction action, + gboolean sensitive, + DropActionMenuData *damd) +{ + GtkWidget *menu_item; + + menu_item = gtk_button_new_with_mnemonic (text); + gtk_widget_set_sensitive (menu_item, sensitive); + gtk_box_append (GTK_BOX (menu), menu_item); + + gtk_style_context_add_class (gtk_widget_get_style_context (menu_item), "flat"); + + g_object_set_data (G_OBJECT (menu_item), + "action", + GINT_TO_POINTER (action)); + + g_signal_connect (menu_item, "clicked", + G_CALLBACK (drop_action_activated_callback), + damd); + + gtk_widget_show (menu_item); +} +#endif +/* Pops up a menu of actions to perform on dropped files */ +GdkDragAction +nautilus_drag_drop_action_ask (GtkWidget *widget, + GdkDragAction actions) +{ +#if 0 + GtkWidget *popover; + GtkWidget *menu; + GtkWidget *menu_item; + DropActionMenuData damd; + + /* Create the menu and set the sensitivity of the items based on the + * allowed actions. + */ + popover = gtk_popover_new (widget); + gtk_popover_set_position (GTK_POPOVER (popover), GTK_POS_TOP); + + menu = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0); + gtk_widget_set_margin_top (menu, 6); + gtk_widget_set_margin_bottom (menu, 6); + gtk_widget_set_margin_start (menu, 6); + gtk_widget_set_margin_end (menu, 6); + gtk_popover_set_child (GTK_POPOVER (popover), menu); + gtk_widget_show (menu); + + append_drop_action_menu_item (menu, _("_Move Here"), + GDK_ACTION_MOVE, + (actions & GDK_ACTION_MOVE) != 0, + &damd); + + append_drop_action_menu_item (menu, _("_Copy Here"), + GDK_ACTION_COPY, + (actions & GDK_ACTION_COPY) != 0, + &damd); + + append_drop_action_menu_item (menu, _("_Link Here"), + GDK_ACTION_LINK, + (actions & GDK_ACTION_LINK) != 0, + &damd); + + menu_item = gtk_separator_new (GTK_ORIENTATION_VERTICAL); + gtk_box_append (GTK_BOX (menu), menu_item); + gtk_widget_show (menu_item); + + append_drop_action_menu_item (menu, _("Cancel"), 0, TRUE, &damd); + + damd.chosen = 0; + damd.loop = g_main_loop_new (NULL, FALSE); + + g_signal_connect (popover, "closed", + G_CALLBACK (menu_deactivate_callback), + &damd); + + gtk_grab_add (popover); + + /* We don't have pointer coords here. Just pick the center of the widget. */ + gtk_popover_set_pointing_to (GTK_POPOVER (popover), + &(GdkRectangle){ .x = 0.5 * gtk_widget_get_allocated_width (widget), + .y = 0.5 * gtk_widget_get_allocated_height (widget), + .width = 0, .height = 0 }); + + gtk_popover_popup (GTK_POPOVER (popover)); + + g_main_loop_run (damd.loop); + + gtk_grab_remove (popover); + + g_main_loop_unref (damd.loop); + + g_object_ref_sink (popover); + g_object_unref (popover); + + return damd.chosen; +#endif + return 0; +} + +GdkDragAction +nautilus_dnd_get_preferred_action (NautilusFile *target_file, + GFile *dropped) +{ + g_autoptr (NautilusDirectory) directory = NULL; + g_autoptr (GFile) target_location = NULL; + g_autoptr (NautilusFile) dropped_file = NULL; + gboolean same_fs; + gboolean source_deletable; + + g_return_val_if_fail (NAUTILUS_IS_FILE (target_file), 0); + g_return_val_if_fail (dropped == NULL || G_IS_FILE (dropped), 0); + + target_location = nautilus_file_get_location (target_file); + if (g_file_equal (target_location, dropped)) + { + return 0; + } + + /* First check target imperatives */ + directory = nautilus_directory_get_for_file (target_file); + + if (nautilus_is_file_roller_installed () && + nautilus_file_is_archive (target_file)) + { + return GDK_ACTION_COPY; + } + else if (nautilus_file_is_starred_location (target_file)) + { + if (nautilus_tag_manager_can_star_contents (nautilus_tag_manager_get (), dropped)) + { + return GDK_ACTION_COPY; + } + else + { + return 0; + } + } + else if (!nautilus_file_is_directory (target_file) || + !nautilus_file_can_write (target_file) || + !nautilus_directory_is_editable (directory)) + { + /* No other file type other than archives and directories currently + * accepts drops */ + return 0; + } + else if (nautilus_file_is_in_trash (target_file)) + { + return GDK_ACTION_MOVE; + } + + if (g_file_has_uri_scheme (dropped, "trash")) + { + return GDK_ACTION_MOVE; + } + + dropped_file = nautilus_file_get (dropped); + same_fs = check_same_fs (target_file, dropped_file); + source_deletable = source_is_deletable (dropped); + if (same_fs && source_deletable) + { + return GDK_ACTION_MOVE; + } + + return GDK_ACTION_COPY; +} + +#define MAX_DRAWN_DRAG_ICONS 10 + +GdkPaintable * +get_paintable_for_drag_selection (GList *selection, + int scale) +{ + g_autoqueue (GdkPaintable) icons = g_queue_new (); + g_autoptr (GtkSnapshot) snapshot = gtk_snapshot_new (); + NautilusFileIconFlags flags; + GdkPaintable *icon; + guint n_icons; + guint icon_size = NAUTILUS_DRAG_SURFACE_ICON_SIZE; + float dx; + float dy; + /* A wide shadow for the pile of icons gives a sense of floating. */ + GskShadow stack_shadow = {.color = {0, 0, 0, .alpha = 0.15}, .dx = 0, .dy = 2, .radius = 10 }; + /* A slight shadow swhich makes each icon in the stack look separate. */ + GskShadow icon_shadow = {.color = {0, 0, 0, .alpha = 0.30}, .dx = 0, .dy = 1, .radius = 1 }; + + g_return_val_if_fail (NAUTILUS_IS_FILE (selection->data), NULL); + + /* The selection list is reversed compared to what the user sees. Get the + * first items by starting from the end of the list. */ + flags = NAUTILUS_FILE_ICON_FLAGS_USE_THUMBNAILS; + for (GList *l = g_list_last (selection); + l != NULL && g_queue_get_length (icons) <= MAX_DRAWN_DRAG_ICONS; + l = l->prev) + { + icon = nautilus_file_get_icon_paintable (l->data, icon_size, scale, flags); + g_queue_push_tail (icons, icon); + } + + /* When there are 2 or 3 identical icons, we need to space them more, + * otherwise it would be hard to tell there is more than one icon at all. + * The more icons we have, the easier it is to notice multiple icons are + * stacked, and the more compact we want to be. + * + * 1 icon 2 icons 3 icons 4+ icons + * .--------. .--------. .--------. .--------. + * | | | | | | | | + * | | | | | | | | + * | | | | | | | | + * | | | | | | | | + * '--------' |--------| |--------| |--------| + * | | | | |--------| + * | | |--------| |--------| + * '--------' | | |--------| + * '--------' '--------' + */ + n_icons = g_queue_get_length (icons); + dx = (n_icons % 2 == 1) ? 6 : -6; + dy = (n_icons == 2) ? 10 : (n_icons == 3) ? 6 : (n_icons >= 4) ? 4 : 0; + + /* We want the first icon on top of every other. So we need to start drawing + * the stack from the bottom, that is, from the last icon. This requires us + * to jump to the last position and then move upwards one step at a time. + * Also, add 10px horizontal offset, for shadow, to workaround this GTK bug: + * https://gitlab.gnome.org/GNOME/gtk/-/issues/2341 + */ + gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (10 + (dx / 2), dy * n_icons)); + gtk_snapshot_push_shadow (snapshot, &stack_shadow, 1); + for (GList *l = g_queue_peek_tail_link (icons); l != NULL; l = l->prev) + { + double w = gdk_paintable_get_intrinsic_width (l->data); + double h = gdk_paintable_get_intrinsic_height (l->data); + /* Offsets needed to center thumbnails. Floored to keep images sharp. */ + float x = floor ((icon_size - w) / 2); + float y = floor ((icon_size - h) / 2); + + gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (-dx, -dy)); + + /* Alternate horizontal offset direction to give a rough pile look. */ + dx = -dx; + + gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y)); + gtk_snapshot_push_shadow (snapshot, &icon_shadow, 1); + + gdk_paintable_snapshot (l->data, snapshot, w, h); + + gtk_snapshot_pop (snapshot); /* End of icon shadow */ + gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (-x, -y)); + } + gtk_snapshot_pop (snapshot); /* End of stack shadow */ + + return gtk_snapshot_to_paintable (snapshot, NULL); +} |