Resolves: tdf#136945 fix custom slide show dnd to reorder pages

Change-Id: Ib28d6779e772fd8ad30899354cde2c281085b328
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/124479
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

2 files changed, 48 insertions, 0 deletions

diff --git a/sd/source/ui/dlg/custsdlg.cxx b/sd/source/ui/dlg/custsdlg.cxx
index db2414a51fa2..89e29a237aa8 100644
--- a/sd/source/ui/dlg/custsdlg.cxx
+++ b/sd/source/ui/dlg/custsdlg.cxx
@@ -261,6 +261,7 @@ SdDefineCustomShowDlg::SdDefineCustomShowDlg(weld::Window* pWindow, SdDrawDocume
     , m_xBtnAdd(m_xBuilder->weld_button("add"))
     , m_xBtnRemove(m_xBuilder->weld_button("remove"))
     , m_xLbCustomPages(m_xBuilder->weld_tree_view("custompages"))
+    , m_xDropTargetHelper(new CustomPagesDropTarget(*m_xLbCustomPages))
     , m_xBtnOK(m_xBuilder->weld_button("ok"))
     , m_xBtnCancel(m_xBuilder->weld_button("cancel"))
     , m_xBtnHelp(m_xBuilder->weld_button("help"))
@@ -485,4 +486,37 @@ IMPL_LINK_NOARG(SdDefineCustomShowDlg, OKHdl, weld::Button&, void)
     }
 }
 
+CustomPagesDropTarget::CustomPagesDropTarget(weld::TreeView& rTreeView)
+    : DropTargetHelper(rTreeView.get_drop_target())
+    , m_rTreeView(rTreeView)
+{
+}
+
+sal_Int8 CustomPagesDropTarget::AcceptDrop(const AcceptDropEvent& rEvt)
+{
+    // to enable the autoscroll when we're close to the edges
+    m_rTreeView.get_dest_row_at_pos(rEvt.maPosPixel, nullptr, true);
+    return DND_ACTION_MOVE;
+}
+
+sal_Int8 CustomPagesDropTarget::ExecuteDrop( const ExecuteDropEvent& rEvt )
+{
+    weld::TreeView* pSource = m_rTreeView.get_drag_source();
+    // only dragging within the same widget allowed
+    if (!pSource || pSource != &m_rTreeView)
+        return DND_ACTION_NONE;
+
+    std::unique_ptr<weld::TreeIter> xSource(m_rTreeView.make_iterator());
+    if (!m_rTreeView.get_selected(xSource.get()))
+        return DND_ACTION_NONE;
+
+    std::unique_ptr<weld::TreeIter> xTarget(m_rTreeView.make_iterator());
+    int nTargetPos = -1;
+    if (m_rTreeView.get_dest_row_at_pos(rEvt.maPosPixel, xTarget.get(), true))
+        nTargetPos = m_rTreeView.get_iter_index_in_parent(*xTarget);
+    m_rTreeView.move_subtree(*xSource, nullptr, nTargetPos);
+
+    return DND_ACTION_NONE;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sd/source/ui/inc/custsdlg.hxx b/sd/source/ui/inc/custsdlg.hxx
index cd25983e9528..f8638845789a 100644
--- a/sd/source/ui/inc/custsdlg.hxx
+++ b/sd/source/ui/inc/custsdlg.hxx
@@ -19,6 +19,7 @@
 
 #pragma once
 
+#include <vcl/transfer.hxx>
 #include <vcl/weld.hxx>
 
 class SdDrawDocument;
@@ -55,6 +56,18 @@ public:
     bool         IsCustomShow() const;
 };
 
+class CustomPagesDropTarget : public DropTargetHelper
+{
+private:
+    weld::TreeView& m_rTreeView;
+
+    virtual sal_Int8 AcceptDrop( const AcceptDropEvent& rEvt ) override;
+    virtual sal_Int8 ExecuteDrop( const ExecuteDropEvent& rEvt ) override;
+
+public:
+    CustomPagesDropTarget(weld::TreeView& rTreeView);
+};
+
 class SdDefineCustomShowDlg : public weld::GenericDialogController
 {
 private:
@@ -68,6 +81,7 @@ private:
     std::unique_ptr<weld::Button> m_xBtnAdd;
     std::unique_ptr<weld::Button> m_xBtnRemove;
     std::unique_ptr<weld::TreeView> m_xLbCustomPages;
+    std::unique_ptr<CustomPagesDropTarget> m_xDropTargetHelper;
     std::unique_ptr<weld::Button> m_xBtnOK;
     std::unique_ptr<weld::Button> m_xBtnCancel;
     std::unique_ptr<weld::Button> m_xBtnHelp;