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add new method listbox;:set_deselect

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set a predicate that decides to deselect selected items in mouse_up event.
This commit is contained in:
Jinhao 2019-05-23 00:49:56 +08:00
parent a21d58a5fe
commit 396319ea28
2 changed files with 21 additions and 1 deletions
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10
include/nana/gui/widgets/listbox.hpp
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@ -1593,6 +1593,16 @@ the nana::detail::basic_window member pointer scheme
* @return index_pairs containing all visible items.
*/
index_pairs visibles() const;
/// Sets a predicate that indicates whether to deselect items when mouse_up is triggered.
/**
* The predicate is called before the listbox attempts to deselect the selected items in the mouse_up event. Other situations,
* the predicates isn't called, for example, releasing mouse button after user performed a box selection, because listbox doesn't deselect the items during this operation.
* @param predicate Decides to deselect the items.
* The paramater of predicate indicates the mouse button which is releasing.
* It returns true to deselect the selected items. It returns false to cancel to deselect the selected items.
*/
void set_deselect(std::function<bool(nana::mouse)> predicate);
private:
drawerbase::listbox::essence & _m_ess() const;
nana::any* _m_anyobj(size_type cat, size_type index, bool allocate_if_empty) const override;

12
source/gui/widgets/listbox.cpp
View File

@ -2011,6 +2011,8 @@ namespace nana
std::function<void(paint::graphics&, const rectangle&, bool)> ctg_icon_renderer; ///< Renderer for the category icon
std::function<bool(nana::mouse)> pred_msup_deselect;
struct operation_rep
{
operation_states state{operation_states::none};
@ -4470,7 +4472,10 @@ namespace nana
if (operation_states::msup_deselect == essence_->operation.state)
{
essence_->operation.state = operation_states::none;
need_refresh |= essence_->lister.select_for_all(false, essence_->operation.item);
//Don't deselect if the predicate returns false
if(!(essence_->pred_msup_deselect && !essence_->pred_msup_deselect(arg.button)))
need_refresh |= essence_->lister.select_for_all(false, essence_->operation.item);
}
if (need_refresh)
@ -6102,6 +6107,11 @@ namespace nana
return indexes;
}
void listbox::set_deselect(std::function<bool(nana::mouse)> predicate)
{
_m_ess().pred_msup_deselect = std::move(predicate);
}
drawerbase::listbox::essence & listbox::_m_ess() const
{
return get_drawer_trigger().ess();