tdf#120087 Disable unuseable items in Manage Dialog

Fix behaviour for 'Remove' and 'Edit' buttons for the Manage Conditional
Formatting dialog in Calc

Change-Id: Id8fc37262464232ab8fbb76c5a9609af5982e222
Reviewed-on: https://gerrit.libreoffice.org/61475Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>

sc/source/ui/condformat/condformatmgr.cxx

@@ -119,6 +119,8 @@ ScCondFormatManagerDlg::ScCondFormatManagerDlg(vcl::Window* pParent, ScDocument*
     m_pBtnEdit->SetClickHdl(LINK(this, ScCondFormatManagerDlg, EditBtnClickHdl));
     m_pBtnAdd->SetClickHdl(LINK(this, ScCondFormatManagerDlg, AddBtnHdl));
     m_pCtrlManager->SetDoubleClickHdl(LINK(this, ScCondFormatManagerDlg, EditBtnHdl));
+
+    UpdateButtonSensitivity();
 }
 
 ScCondFormatManagerDlg::~ScCondFormatManagerDlg()
@@ -142,6 +144,13 @@ std::unique_ptr<ScConditionalFormatList> ScCondFormatManagerDlg::GetConditionalF
     return std::move(mpFormatList);
 }
 
+void ScCondFormatManagerDlg::UpdateButtonSensitivity()
+{
+    OUString aNewSensitivity = mpFormatList->size() ? OUString("true") : OUString("false");
+    m_pBtnRemove->set_property("sensitive", aNewSensitivity);
+    m_pBtnEdit->set_property("sensitive", aNewSensitivity);
+}
+
 // Get the current conditional format selected.
 //
 ScConditionalFormat* ScCondFormatManagerDlg::GetCondFormatSelected()
@@ -153,12 +162,14 @@ IMPL_LINK_NOARG(ScCondFormatManagerDlg, RemoveBtnHdl, Button*, void)
 {
     m_pCtrlManager->DeleteSelection();
     mbModified = true;
+    UpdateButtonSensitivity();
 }
 
 IMPL_LINK_NOARG(ScCondFormatManagerDlg, EditBtnClickHdl, Button*, void)
 {
     mbModified = true;
     EditBtnHdl(nullptr);
+    UpdateButtonSensitivity();
 }
 IMPL_LINK_NOARG(ScCondFormatManagerDlg, EditBtnHdl, SvTreeListBox*, bool)
 {
@@ -182,6 +193,7 @@ IMPL_LINK_NOARG(ScCondFormatManagerDlg, AddBtnHdl, Button*, void)
 void ScCondFormatManagerDlg::SetModified()
 {
     mbModified = true;
+    UpdateButtonSensitivity();
 }
 
 bool ScCondFormatManagerDlg::CondFormatsChanged() const

sc/source/ui/inc/condformatmgr.hxx

@@ -64,6 +64,7 @@ private:
     VclPtr<PushButton> m_pBtnEdit;
     std::unique_ptr<ScConditionalFormatList> mpFormatList;
     VclPtr<ScCondFormatManagerWindow> m_pCtrlManager;
+    void UpdateButtonSensitivity();
 
     DECL_LINK(RemoveBtnHdl, Button*, void);
     DECL_LINK(EditBtnClickHdl, Button*, void);