STR 3442: copy/paste now inserts widget as expected.

Fluid would add pasted widgets as the last child of the
current group, even if they were cut at the beginning
of the group. This patch adds a 'startegy' to adding
widgets to allow merging closer to the 'current' widget.

Also added d'n'd for the widget bin and some other
UI improvements.

STR 3442: some preparation, variable renaming

STR 3442: unifying functions to add widgets.

Adding widgets interactively is merged into one function,
making undo/redo work as expected and removing
unexpected differences between adding by menu or bin.

STR 3442: adding drag'n'drop for windows from bin.

Just drag the window symbol out of the tree and drop it anywhere
on the desktop.

Visual representation of dragged Window.

STR 3442: insert individual nodes after 'current'

STR 3442: adding new widget at expected positions.

The widget bin can finally do drag'n'drop.
Widgets appear in the tree close to the last selection.
Duplicating now ads right below.
Cut and paste inserts after last selection.

Fluid: replaced #define with strict enum type.

1 files changed, 9 insertions, 0 deletions

diff --git a/fluid/undo.cxx b/fluid/undo.cxx
index 38d70c2e1..09f2867d9 100644
--- a/fluid/undo.cxx
+++ b/fluid/undo.cxx
@@ -19,6 +19,7 @@
 #include "fluid.h"
 #include "file.h"
 #include "Fl_Type.h"
+#include "widget_browser.h"
 
 #include <FL/Fl.H>
 #include <FL/Fl_Preferences.H>
@@ -107,11 +108,19 @@ void undo_cb(Fl_Widget *, void *) {
   }
 
   undo_suspend();
+  // Undo first deletes all widgets which resets the widget_tree browser.
+  // Save the current scroll position, so we don;t scroll back to 0 at undo.
+  int x = widget_browser->hposition();
+  int y = widget_browser->position();
   if (!read_file(undo_filename(undo_current - 1), 0)) {
     // Unable to read checkpoint file, don't undo...
     undo_resume();
     return;
   }
+  // Restore old browser position.
+  // Ideally, we would save the browser position insied the undo file.
+  widget_browser->hposition(x);
+  widget_browser->position(y);
 
   undo_current --;