Start Drag event support

part of 19d17a7

Change-Id: I1a1b5fd4f4aedbf79f64fdb4334aadc014b4eabb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108026
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>

4 files changed, 21 insertions, 2 deletions

diff --git a/include/vcl/salvtables.hxx b/include/vcl/salvtables.hxx
index 401cbb0702a3..b96d02f0a5a8 100644
--- a/include/vcl/salvtables.hxx
+++ b/include/vcl/salvtables.hxx
@@ -1138,7 +1138,7 @@ protected:
     DECL_LINK(HeaderBarClickedHdl, HeaderBar*, void);
     DECL_LINK(ToggleHdl, SvLBoxButtonData*, void);
     DECL_LINK(ModelChangedHdl, SvTreeListBox*, void);
-    DECL_LINK(StartDragHdl, SvTreeListBox*, void);
+    DECL_LINK(StartDragHdl, SvTreeListBox*, bool);
     DECL_STATIC_LINK(SalInstanceTreeView, FinishDragHdl, SvTreeListBox*, void);
     DECL_LINK(EditingEntryHdl, SvTreeListEntry*, bool);
     typedef std::pair<SvTreeListEntry*, OUString> IterString;
@@ -1373,6 +1373,9 @@ public:
 
     virtual void set_id(const weld::TreeIter& rIter, const OUString& rId) override;
 
+    virtual void enable_drag_source(rtl::Reference<TransferDataContainer>& rHelper,
+                                    sal_uInt8 eDNDConstants) override;
+
     virtual void set_selection_mode(SelectionMode eMode) override;
 
     virtual void all_foreach(const std::function<bool(weld::TreeIter&)>& func) override;
diff --git a/include/vcl/transfer.hxx b/include/vcl/transfer.hxx
index 75af922a007c..a0b773984d3b 100644
--- a/include/vcl/transfer.hxx
+++ b/include/vcl/transfer.hxx
@@ -483,7 +483,7 @@ public:
 
 struct TransferDataContainer_Impl;
 
-class VCL_DLLPUBLIC TransferDataContainer final : public TransferableHelper
+class VCL_DLLPUBLIC TransferDataContainer : public TransferableHelper
 {
     std::unique_ptr<TransferDataContainer_Impl> pImpl;
 
diff --git a/include/vcl/treelistbox.hxx b/include/vcl/treelistbox.hxx
index d0fcfabd9e01..537e4abc7a8d 100644
--- a/include/vcl/treelistbox.hxx
+++ b/include/vcl/treelistbox.hxx
@@ -227,9 +227,13 @@ class VCL_DLLPUBLIC SvTreeListBox
     SelectionMode   eSelMode;
     sal_Int32       nMinWidthInChars;
 
+    sal_Int8        mnDragAction;
+
     SvTreeListEntry*        pEdEntry;
     SvLBoxItem*             pEdItem;
 
+    rtl::Reference<TransferDataContainer> m_xTransferHelper;
+
 protected:
     std::unique_ptr<SvImpLBox>              pImpl;
     short                   nColumns;
@@ -736,6 +740,8 @@ public:
     void            SetForceMakeVisible(bool bEnable);
 
     virtual FactoryFunction GetUITestFactory() const override;
+
+    void            SetDragHelper(rtl::Reference<TransferDataContainer>& rHelper, sal_uInt8 eDNDConstants);
 };
 
 class SvInplaceEdit2
diff --git a/include/vcl/weld.hxx b/include/vcl/weld.hxx
index 496f1e718f7c..3acf96b1fcf7 100644
--- a/include/vcl/weld.hxx
+++ b/include/vcl/weld.hxx
@@ -63,6 +63,7 @@ enum class PointerStyle;
 class SvNumberFormatter;
 class KeyEvent;
 class MouseEvent;
+class TransferDataContainer;
 class OutputDevice;
 class VirtualDevice;
 struct SystemEnvData;
@@ -709,7 +710,10 @@ protected:
     Link<const TreeIter&, bool> m_aCollapsingHdl;
     Link<TreeView&, void> m_aVisibleRangeChangedHdl;
     Link<TreeView&, void> m_aModelChangedHdl;
+    // if handler returns true, then menu has been show and event is consumed
     Link<const CommandEvent&, bool> m_aPopupMenuHdl;
+    // if handler returns true, drag is disallowed
+    Link<TreeView&, bool> m_aDragBeginHdl;
     std::function<int(const weld::TreeIter&, const weld::TreeIter&)> m_aCustomSort;
 
     std::vector<int> m_aRadioIndexes;
@@ -978,6 +982,12 @@ public:
         m_aPopupMenuHdl = rLink;
     }
 
+    virtual void enable_drag_source(rtl::Reference<TransferDataContainer>& rTransferrable,
+                                    sal_uInt8 eDNDConstants)
+        = 0;
+
+    void connect_drag_begin(const Link<TreeView&, bool>& rLink) { m_aDragBeginHdl = rLink; }
+
     //all of them
     void select_all() { unselect(-1); }
     void unselect_all() { select(-1); }