chiark / gitweb /
Move drag-begin handling to multidrag.c
[disorder] / disobedience / queue-generic.c
index 913d9d37d1afb73144872e9ef18181179fb51c3b..179998a5b17ad1a9d5d1a28cceec333d691d640b 100644 (file)
 #include "disobedience.h"
 #include "popup.h"
 #include "queue-generic.h"
-
-static struct queuelike *const queuelikes[] = {
-  &ql_queue, &ql_recent, &ql_added
-};
-#define NQUEUELIKES (sizeof queuelikes / sizeof *queuelikes)
+#include "multidrag.h"
 
 static const GtkTargetEntry queuelike_targets[] = {
   {
-    (char *)"text/x-disorder-track-data", /* drag type */
-    GTK_TARGET_SAME_WIDGET,             /* rearrangement only for now */
+    (char *)"text/x-disorder-queued-tracks", /* drag type */
+    GTK_TARGET_SAME_WIDGET,             /* rearrangement within a widget */
     0                                   /* ID value */
   },
+  {
+    (char *)"text/x-disorder-playable-tracks", /* drag type */
+    GTK_TARGET_SAME_APP|GTK_TARGET_OTHER_WIDGET, /* copying between widgets */
+    1                                     /* ID value */
+  },
 };
 
 /* Track detail lookup ----------------------------------------------------- */
@@ -423,84 +424,15 @@ void ql_new_queue(struct queuelike *ql,
   --suppress_actions;
 }
 
-/** @brief State for ql_drag_begin() and its callbacks */
-struct ql_drag_begin_state {
-  struct queuelike *ql;
-  int rows;
-  int index;
-  GdkPixmap **pixmaps;
-};
-
-/** @brief Callback to construct a row pixmap */
-static void ql_drag_make_row_pixmaps(GtkTreeModel attribute((unused)) *model,
-                                     GtkTreePath *path,
-                                     GtkTreeIter attribute((unused)) *iter,
-                                     gpointer data) {
-  struct ql_drag_begin_state *qdbs = data;
-
-  qdbs->pixmaps[qdbs->index++]
-    = gtk_tree_view_create_row_drag_icon(GTK_TREE_VIEW(qdbs->ql->view),
-                                         path);
-}
-
-/** @brief Called when a drag operation from this queuelike begins
- * @param w Source widget (the tree view)
+/** @brief Called when a drag moves within a candidate destination
+ * @param w Destination widget
  * @param dc Drag context
- * @param user_data The queuelike
+ * @param x Current pointer location
+ * @param y Current pointer location
+ * @param time_ Current time
+ * @param user_data Pointer to queuelike
+ * @return TRUE in a dropzone, otherwise FALSE
  */
-static void ql_drag_begin(GtkWidget attribute((unused)) *w,
-                          GdkDragContext attribute((unused)) *dc,
-                          gpointer user_data) {
-  struct queuelike *const ql = user_data;
-  struct ql_drag_begin_state qdbs[1];
-  GdkPixmap *icon;
-
-  //fprintf(stderr, "drag-begin\n");
-  memset(qdbs, 0, sizeof *qdbs);
-  qdbs->ql = ql;
-  /* Find out how many rows there are */
-  if(!(qdbs->rows = gtk_tree_selection_count_selected_rows(ql->selection)))
-    return;                             /* doesn't make sense */
-  /* Generate a pixmap for each row */
-  qdbs->pixmaps = xcalloc(qdbs->rows, sizeof *qdbs->pixmaps);
-  gtk_tree_selection_selected_foreach(ql->selection,
-                                      ql_drag_make_row_pixmaps,
-                                      qdbs);
-  /* Determine the size of the final icon */
-  int height = 0, width = 0;
-  for(int n = 0; n < qdbs->rows; ++n) {
-    int pxw, pxh;
-    gdk_drawable_get_size(qdbs->pixmaps[n], &pxw, &pxh);
-    if(pxw > width)
-      width = pxw;
-    height += pxh;
-  }
-  if(!width || !height)
-    return;                             /* doesn't make sense */
-  /* Construct the icon */
-  icon = gdk_pixmap_new(qdbs->pixmaps[0], width, height, -1);
-  GdkGC *gc = gdk_gc_new(icon);
-  gdk_gc_set_colormap(gc, gtk_widget_get_colormap(ql->view));
-  int y = 0;
-  for(int n = 0; n < qdbs->rows; ++n) {
-    int pxw, pxh;
-    gdk_drawable_get_size(qdbs->pixmaps[n], &pxw, &pxh);
-    gdk_draw_drawable(icon,
-                      gc,
-                      qdbs->pixmaps[n],
-                      0, 0,             /* source coords */
-                      0, y,             /* dest coords */
-                      pxw, pxh);        /* size */
-    y += pxh;
-  }
-  // TODO scale down a bit, the resulting icons are currently a bit on the
-  // large side.
-  gtk_drag_source_set_icon(ql->view,
-                           gtk_widget_get_colormap(ql->view),
-                           icon,
-                           NULL);
-}
-
 static gboolean ql_drag_motion(GtkWidget *w,
                                GdkDragContext *dc,
                                gint x,
@@ -517,18 +449,18 @@ static gboolean ql_drag_motion(GtkWidget *w,
   //    then the lowest-numbered member of the intersection is chosen.
   // 3) otherwise no member is chosen and gdk_drag_status() is called
   //    with action=0 to refuse the drop.
-  // Currently we can only accept _MOVE.  But in the future we will
-  // need to accept _COPY in some cases.
   if(dc->suggested_action) {
-    if(dc->suggested_action == GDK_ACTION_MOVE)
+    if(dc->suggested_action & (GDK_ACTION_MOVE|GDK_ACTION_COPY))
       action = dc->suggested_action;
   } else if(dc->actions & GDK_ACTION_MOVE)
-    action = dc->actions;
+    action = GDK_ACTION_MOVE;
+  else if(dc->actions & GDK_ACTION_COPY)
+    action = GDK_ACTION_COPY;
   /*fprintf(stderr, "suggested %#x actions %#x result %#x\n",
     dc->suggested_action, dc->actions, action);*/
   if(action) {
     // If the action is acceptable then we see if this widget is acceptable
-    if(!gtk_drag_dest_find_target(w, dc, NULL))
+    if(gtk_drag_dest_find_target(w, dc, NULL) == GDK_NONE)
       action = 0;
   }
   // Report the status
@@ -563,6 +495,12 @@ static gboolean ql_drag_motion(GtkWidget *w,
   return TRUE;
 }
 
+/** @brief Called when a drag moves leaves a candidate destination
+ * @param w Destination widget
+ * @param dc Drag context
+ * @param time_ Current time
+ * @param user_data Pointer to queuelike
+ */
 static void ql_drag_leave(GtkWidget *w,
                           GdkDragContext attribute((unused)) *dc,
                           guint attribute((unused)) time_,
@@ -614,6 +552,7 @@ static void ql_drag_data_get(GtkWidget attribute((unused)) *w,
   gtk_tree_selection_selected_foreach(ql->selection,
                                       ql_drag_data_get_collect,
                                       result);
+  // TODO must not be able to drag playing track!
   //fprintf(stderr, "drag-data-get: %.*s\n",
   //        result->nvec, result->vec);
   /* gtk_selection_data_set_text() insists that data->target is one of a
@@ -647,7 +586,7 @@ static void ql_drag_data_received(GtkWidget attribute((unused)) *w,
   struct vector ids[1], tracks[1];
   int parity = 0;
 
-  //fprintf(stderr, "drag-data-received: %d,%d\n", x, y);
+  //fprintf(stderr, "drag-data-received: %d,%d info_=%u\n", x, y, info_);
   /* Get the selection string */
   p = result = (char *)gtk_selection_data_get_text(data);
   if(!result) {
@@ -707,9 +646,21 @@ static void ql_drag_data_received(GtkWidget attribute((unused)) *w,
       break;
     }
   }
+  /* Guarantee we never drop an empty list */
+  if(!tracks->nvec)
+    return;
   /* Note that q->id can match one of ids[].  This doesn't matter for
    * moveafter but TODO may matter for playlist support. */
-  ql->drop(ql, tracks->nvec, tracks->vec, ids->vec, q);
+  switch(info_) {
+  case 0:
+    /* Rearrangement.  Send ID and track data. */
+    ql->drop(ql, tracks->nvec, tracks->vec, ids->vec, q);
+    break;
+  case 1:
+    /* Copying between widgets.  IDs mean nothing so don't send them. */
+    ql->drop(ql, tracks->nvec, tracks->vec, NULL, q);
+    break;
+  }
 }
 
 /** @brief Initialize a @ref queuelike */
@@ -787,9 +738,7 @@ GtkWidget *init_queuelike(struct queuelike *ql) {
                       GTK_DEST_DEFAULT_HIGHLIGHT|GTK_DEST_DEFAULT_DROP,
                       queuelike_targets,
                       sizeof queuelike_targets / sizeof *queuelike_targets,
-                      GDK_ACTION_MOVE);
-    g_signal_connect(ql->view, "drag-begin",
-                     G_CALLBACK(ql_drag_begin), ql);
+                      GDK_ACTION_MOVE|GDK_ACTION_COPY);
     g_signal_connect(ql->view, "drag-motion",
                      G_CALLBACK(ql_drag_motion), ql);
     g_signal_connect(ql->view, "drag-leave",
@@ -798,9 +747,17 @@ GtkWidget *init_queuelike(struct queuelike *ql) {
                      G_CALLBACK(ql_drag_data_get), ql);
     g_signal_connect(ql->view, "drag-data-received",
                      G_CALLBACK(ql_drag_data_received), ql);
+    make_treeview_multidrag(ql->view);
   } else {
-    /* TODO: support copy-dragging out of non-rearrangeable queues.  Will need
-     * to support copy dropping into the rearrangeable ones. */
+    /* For queues that cannot accept a drop we still accept a copy out */
+    gtk_drag_source_set(ql->view,
+                        GDK_BUTTON1_MASK,
+                        queuelike_targets,
+                        sizeof queuelike_targets / sizeof *queuelike_targets,
+                        GDK_ACTION_COPY);
+    g_signal_connect(ql->view, "drag-data-get",
+                     G_CALLBACK(ql_drag_data_get), ql);
+    make_treeview_multidrag(ql->view);
   }
   
   /* TODO style? */