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MultiSelect: (Breaking) Use ImGuiSelectionUserData (= ImS64) instead of void* for selection user data.

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Less confusing for most users, less casting.
This commit is contained in:
ocornut 2023-08-07 12:38:24 +02:00
parent 140a2f0565
commit e82b49d2d4
4 changed files with 53 additions and 45 deletions
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38
imgui.h
View File

@ -265,8 +265,9 @@ typedef ImWchar32 ImWchar;
typedef ImWchar16 ImWchar;
#endif
// Multi-Selection item index or identifier when using SetNextItemSelectionUserData()/BeginMultiSelect()
// (Most users are likely to use this store an item INDEX but this may be used to store a POINTER as well.)
// Multi-Selection item index or identifier when using BeginMultiSelect()
// - Used by SetNextItemSelectionUserData() + and inside ImGuiMultiSelectIO structure.
// - Most users are likely to use this store an item INDEX but this may be used to store a POINTER as well. Read comments near ImGuiMultiSelectIO for details.
typedef ImS64 ImGuiSelectionUserData;
// Callback and functions types
@ -670,7 +671,7 @@ namespace ImGui
// Multi-selection system for Selectable() and TreeNode() functions.
// - This enables standard multi-selection/range-selection idioms (CTRL+Mouse/Keyboard, SHIFT+Mouse/Keyboard, etc.) in a way that also allow a clipper to be used.
// - Read comments near ImGuiMultiSelectIO for details.
// - ImGuiSelectionUserData is often used to store your item index. Read comments near ImGuiMultiSelectIO for details.
IMGUI_API ImGuiMultiSelectIO* BeginMultiSelect(ImGuiMultiSelectFlags flags);
IMGUI_API ImGuiMultiSelectIO* EndMultiSelect();
IMGUI_API void SetNextItemSelectionUserData(ImGuiSelectionUserData selection_user_data);
@ -2754,18 +2755,25 @@ enum ImGuiMultiSelectFlags_
// For small selection set (<100 items), you might want to not bother with using the clipper, as the cost you should
// be negligible (as least on Dear ImGui side).
// If you are not sure, always start without clipping and you can work your way to the optimized version afterwards.
// - The void* RangeSrcItem/RangeDstItem value represent a selectable object. They are the value you pass to SetNextItemSelectionUserData().
// Most likely you will want to store an index here.
// Storing an integer index is the easiest thing to do, as SetRange requests will give you two end points and you will need to interpolate
// between them to honor range selection. But the code never assume that sortable integers are used (you may store pointers to your object,
// and then from the pointer have your own way of iterating from RangeSrcItem to RangeDstItem).
// About ImGuiSelectionUserData:
// - This is your application-defined identifier in a selection set:
// - For each item is submitted by your calls to SetNextItemSelectionUserData().
// - In return we store them into RangeSrcItem/RangeDstItem and other fields ImGuiMultiSelectIO.
// - Most applications will store an object INDEX, hence the chosen name and type.
// Storing an integer index is the easiest thing to do, as SetRange requests will give you two end points
// and you will need to interpolate between them to honor range selection.
// - However it is perfectly possible to store a POINTER inside this value! The multi-selection system never assume
// that you identify items by indices, and never attempt to interpolate between two ImGuiSelectionUserData values.
// - As most users will want to cast this to integer, for convenience and to reduce confusion we use ImS64 instead
// of void*, being syntactically easier to downcast. But feel free to reinterpret_cast a pointer into this.
// - If you need to wrap this API for another language/framework, feel free to expose this as 'int' if simpler.
// Usage flow:
// BEGIN - (1) Call BeginMultiSelect() and retrieve the ImGuiMultiSelectIO* result.
// - (2) [If using clipper] Honor Clear/SelectAll/SetRange requests by updating your selection data. Same code as Step 6.
// LOOP - (3) [If using clipper] Set RangeSrcPassedBy=true if the RangeSrcItem item is part of the items clipped before the first submitted/visible item.
// This is because for range-selection we need to know if we are currently "inside" or "outside" the range.
// - If you are using integer indices, this is easy to compute: if (clipper.DisplayStart > data->RangeSrcItem) { data->RangeSrcPassedBy = true; }
// - If you are using pointers, you may need additional processing in each clipper step to tell if current DisplayStart comes after RangeSrcItem..
// - If you are using integer indices in ImGuiSelectionUserData, this is easy to compute: if (clipper.DisplayStart > data->RangeSrcItem) { data->RangeSrcPassedBy = true; }
// - If you are using pointers in ImGuiSelectionUserData, you may need additional processing in each clipper step to tell if current DisplayStart comes after RangeSrcItem..
// - (4) Submit your items with SetNextItemSelectionUserData() + Selectable()/TreeNode() calls. (optionally call IsItemToggledSelection() if you need that info immediately for displaying your item, before EndMultiSelect())
// END - (5) Call EndMultiSelect() and retrieve the ImGuiMultiSelectIO* result.
// - (6) Honor Clear/SelectAll/SetRange requests by updating your selection data. Same code as Step 2.
@ -2780,19 +2788,19 @@ struct ImGuiMultiSelectIO
bool RequestClear; // ms:w, app:r / / ms:w, app:r // 1. Request app/user to clear selection.
bool RequestSelectAll; // ms:w, app:r / / ms:w, app:r // 2. Request app/user to select all.
bool RequestSetRange; // / / ms:w, app:r // 3. Request app/user to select/unselect [RangeSrcItem..RangeDstItem] items, based on RangeSelected. In practice, only EndMultiSelect() request this, app code can read after BeginMultiSelect() and it will always be false.
void* RequestFocusItem; // app:w / app:r / app:r // (If using deletion) 4. Request user to focus item. This is actually only manipulated in user-space, but we provide storage to facilitate implementing a deletion idiom (see demo).
ImGuiSelectionUserData RequestFocusItem; // app:w / app:r / app:r // (If using deletion) 4. Request user to focus item. This is actually only manipulated in user-space, but we provide storage to facilitate implementing a deletion idiom (see demo).
// STATE/ARGUMENTS -------------------------// BEGIN / LOOP / END
void* RangeSrcItem; // ms:w / app:r / ms:w, app:r // Begin: Last known SetNextItemSelectionUserData() value for RangeSrcItem. End: parameter from RequestSetRange request.
void* RangeDstItem; // / / ms:w, app:r // End: parameter from RequestSetRange request.
ImGuiSelectionUserData RangeSrcItem; // ms:w / app:r / ms:w, app:r // Begin: Last known SetNextItemSelectionUserData() value for RangeSrcItem. End: parameter from RequestSetRange request.
ImGuiSelectionUserData RangeDstItem; // / / ms:w, app:r // End: parameter from RequestSetRange request.
ImS8 RangeDirection; // / / ms:w, app:r // End: parameter from RequestSetRange request. +1 if RangeSrcItem came before RangeDstItem, -1 otherwise. Available as an indicator in case you cannot infer order from the void* values. If your void* values are storing indices you will never need this.
bool RangeSelected; // / / ms:w, app:r // End: parameter from RequestSetRange request. true = Select Range, false = Unselect Range.
bool RangeSrcPassedBy; // / ms:rw app:w / ms:r // (If using clipper) Need to be set by app/user if RangeSrcItem was part of the clipped set before submitting the visible items. Ignore if not clipping.
bool RangeSrcReset; // app:w / app:w / ms:r // (If using deletion) Set before EndMultiSelect() to reset ResetSrcItem (e.g. if deleted selection).
bool NavIdSelected; // ms:w, app:r / / // (If using deletion) Last known selection state for NavId (if part of submitted items).
void* NavIdItem; // ms:w, app:r / / // (If using deletion) Last known SetNextItemSelectionUserData() value for NavId (if part of submitted items).
ImGuiSelectionUserData NavIdItem; // ms:w, app:r / / // (If using deletion) Last known SetNextItemSelectionUserData() value for NavId (if part of submitted items).
ImGuiMultiSelectIO() { Clear(); }
void Clear() { memset(this, 0, sizeof(*this)); RequestFocusItem = NavIdItem = RangeSrcItem = RangeDstItem = (void*)-1; }
void Clear() { memset(this, 0, sizeof(*this)); RequestFocusItem = NavIdItem = RangeSrcItem = RangeDstItem = (ImGuiSelectionUserData)-1; }
};
//-----------------------------------------------------------------------------

24
imgui_demo.cpp
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@ -2802,7 +2802,7 @@ struct ExampleSelection
{
if (ms_io->RequestClear) { Clear(); }
if (ms_io->RequestSelectAll) { SelectAll(items_count); }
if (ms_io->RequestSetRange) { SetRange((int)(intptr_t)ms_io->RangeSrcItem, (int)(intptr_t)ms_io->RangeDstItem, ms_io->RangeSelected ? 1 : 0); }
if (ms_io->RequestSetRange) { SetRange((int)ms_io->RangeSrcItem, (int)ms_io->RangeDstItem, ms_io->RangeSelected ? 1 : 0); }
}
void DebugTooltip()
@ -2827,19 +2827,19 @@ struct ExampleSelection
QueueDeletion = false;
// If current item is not selected.
if (ms_io->NavIdSelected == false) // Here 'NavIdSelected' should be == to 'GetSelected(ms_io->NavIdData)'
if (ms_io->NavIdSelected == false) // Here 'NavIdSelected' should be == to 'GetSelected(ms_io->NavIdData)'
{
ms_io->RangeSrcReset = true; // Request to recover RangeSrc from NavId next frame. Would be ok to reset even without the !NavIdSelected test but it would take an extra frame to recover RangeSrc when deleting a selected item.
return (int)(intptr_t)ms_io->NavIdItem; // Request to land on same item after deletion.
ms_io->RangeSrcReset = true; // Request to recover RangeSrc from NavId next frame. Would be ok to reset even without the !NavIdSelected test but it would take an extra frame to recover RangeSrc when deleting a selected item.
return (int)ms_io->NavIdItem; // Request to land on same item after deletion.
}
// If current item is selected: land on first unselected item after RangeSrc.
for (int n = (int)(intptr_t)ms_io->RangeSrcItem + 1; n < items.Size; n++)
for (int n = (int)ms_io->RangeSrcItem + 1; n < items.Size; n++)
if (!GetSelected(n))
return n;
// If current item is selected: otherwise return last unselected item.
for (int n = IM_MIN((int)(intptr_t)ms_io->RangeSrcItem, items.Size) - 1; n >= 0; n--)
for (int n = IM_MIN((int)ms_io->RangeSrcItem, items.Size) - 1; n >= 0; n--)
if (!GetSelected(n))
return n;
@ -2860,7 +2860,7 @@ struct ExampleSelection
IM_UNUSED(ms_io);
ImVector<ITEM_TYPE> new_items;
new_items.reserve(items.Size - SelectionSize);
int next_focus_idx_in_old_selection = (int)(intptr_t)ms_io->RequestFocusItem;
int next_focus_idx_in_old_selection = (int)ms_io->RequestFocusItem;
int next_focus_idx_in_new_selection = -1;
for (int n = 0; n < items.Size; n++)
{
@ -3016,8 +3016,8 @@ static void ShowDemoWindowMultiSelect()
// FIXME-MULTISELECT: If pressing Delete + another key we have ambiguous behavior.
const bool want_delete = (selection.GetSize() > 0) && ImGui::IsWindowFocused() && ImGui::IsKeyPressed(ImGuiKey_Delete);
if (want_delete)
ms_io->RequestFocusItem = (void*)(intptr_t)selection.ApplyDeletionPreLoop(ms_io, items);
const int next_focus_item_idx = (int)(intptr_t)ms_io->RequestFocusItem;
ms_io->RequestFocusItem = selection.ApplyDeletionPreLoop(ms_io, items);
const int next_focus_item_idx = (int)ms_io->RequestFocusItem;
for (int n = 0; n < items.Size; n++)
{
@ -3138,7 +3138,7 @@ static void ShowDemoWindowMultiSelect()
const bool want_delete = selection.QueueDeletion || ((selection.GetSize() > 0) && ImGui::IsWindowFocused() && ImGui::IsKeyPressed(ImGuiKey_Delete));
if (want_delete)
selection.ApplyDeletionPreLoop(ms_io, items);
const int next_focus_item_idx = (int)(intptr_t)ms_io->RequestFocusItem;
const int next_focus_item_idx = (int)ms_io->RequestFocusItem;
if (show_in_table)
{
@ -3162,7 +3162,7 @@ static void ShowDemoWindowMultiSelect()
{
// IF clipping is used: you need to set 'RangeSrcPassedBy = true' if RangeSrc was passed over.
// If you submit all items this is unnecessary as this is one by SetNextItemSelectionUserData()
if (use_clipper && clipper.DisplayStart > (int)(intptr_t)ms_io->RangeSrcItem)
if (use_clipper && !ms_io->RangeSrcPassedBy && clipper.DisplayStart > ms_io->RangeSrcItem)
ms_io->RangeSrcPassedBy = true;
const int item_begin = use_clipper ? clipper.DisplayStart : 0;
@ -3254,7 +3254,7 @@ static void ShowDemoWindowMultiSelect()
// If clipping is used: you need to set 'RangeSrcPassedBy = true' if RangeSrc was passed over.
// If you submit all items this is unnecessary as this is one by SetNextItemSelectionUserData()
// Here we essentially notify before EndMultiSelect() that RangeSrc is still present in our data set.
if (use_clipper && items.Size > (int)(intptr_t)ms_io->RangeSrcItem)
if (use_clipper && !ms_io->RangeSrcPassedBy && items.Size > ms_io->RangeSrcItem)
ms_io->RangeSrcPassedBy = true;
if (show_in_table)

6
imgui_internal.h
View File

@ -1741,11 +1741,11 @@ struct IMGUI_API ImGuiMultiSelectState
int LastFrameActive; // Last used frame-count, for GC.
ImS8 RangeSelected; // -1 (don't have) or true/false
ImS8 NavIdSelected; // -1 (don't have) or true/false
void* RangeSrcItem; //
void* NavIdItem; // SetNextItemSelectionUserData() value for NavId (if part of submitted items)
ImGuiSelectionUserData RangeSrcItem; //
ImGuiSelectionUserData NavIdItem; // SetNextItemSelectionUserData() value for NavId (if part of submitted items)
ImGuiMultiSelectState() { Init(0); }
void Init(ImGuiID id) { Window = NULL; ID = id; LastFrameActive = 0; RangeSelected = NavIdSelected = -1; RangeSrcItem = NavIdItem = (void*)-1; }
void Init(ImGuiID id) { Window = NULL; ID = id; LastFrameActive = 0; RangeSelected = NavIdSelected = -1; RangeSrcItem = NavIdItem = ImGuiSelectionUserData_Invalid; }
};
#endif // #ifdef IMGUI_HAS_MULTI_SELECT

30
imgui_widgets.cpp
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@ -7128,7 +7128,7 @@ static void DebugLogMultiSelectRequests(const char* function, const ImGuiMultiSe
ImGuiContext& g = *GImGui;
if (data->RequestClear) IMGUI_DEBUG_LOG_SELECTION("[selection] %s: RequestClear\n", function);
if (data->RequestSelectAll) IMGUI_DEBUG_LOG_SELECTION("[selection] %s: RequestSelectAll\n", function);
if (data->RequestSetRange) IMGUI_DEBUG_LOG_SELECTION("[selection] %s: RequestSetRange %p..%p = %d (dir %+d)\n", function, data->RangeSrcItem, data->RangeDstItem, data->RangeSelected, data->RangeDirection);
if (data->RequestSetRange) IMGUI_DEBUG_LOG_SELECTION("[selection] %s: RequestSetRange %p..%p = %d (dir %+d)\n", function, (void*)data->RangeSrcItem, (void*)data->RangeDstItem, data->RangeSelected, data->RangeDirection);
}
// Return ImGuiMultiSelectIO structure. Lifetime: valid until corresponding call to EndMultiSelect().
@ -7174,7 +7174,7 @@ ImGuiMultiSelectIO* ImGui::BeginMultiSelect(ImGuiMultiSelectFlags flags)
if (ms->KeyMods & ImGuiMod_Shift)
ms->IsSetRange = true;
if (ms->IsSetRange)
IM_ASSERT(storage->RangeSrcItem != (void*)-1); // Not ready -> could clear?
IM_ASSERT(storage->RangeSrcItem != ImGuiSelectionUserData_Invalid); // Not ready -> could clear?
if ((ms->KeyMods & (ImGuiMod_Ctrl | ImGuiMod_Shift)) == 0)
ms->BeginIO.RequestClear = true;
}
@ -7207,15 +7207,15 @@ ImGuiMultiSelectIO* ImGui::EndMultiSelect()
if (ms->IsFocused)
{
if (ms->BeginIO.RangeSrcReset || (ms->BeginIO.RangeSrcPassedBy == false && ms->BeginIO.RangeSrcItem != (void*)-1))
if (ms->BeginIO.RangeSrcReset || (ms->BeginIO.RangeSrcPassedBy == false && ms->BeginIO.RangeSrcItem != ImGuiSelectionUserData_Invalid))
{
IMGUI_DEBUG_LOG_SELECTION("[selection] EndMultiSelect: Reset RangeSrcItem.\n"); // Will set be to NavId.
ms->Storage->RangeSrcItem = (void*)-1;
ms->Storage->RangeSrcItem = ImGuiSelectionUserData_Invalid;
}
if (ms->NavIdPassedBy == false && ms->Storage->NavIdItem != (void*)-1)
if (ms->NavIdPassedBy == false && ms->Storage->NavIdItem != ImGuiSelectionUserData_Invalid)
{
IMGUI_DEBUG_LOG_SELECTION("[selection] EndMultiSelect: Reset NavIdItem.\n");
ms->Storage->NavIdItem = (void*)-1;
ms->Storage->NavIdItem = ImGuiSelectionUserData_Invalid;
ms->Storage->NavIdSelected = -1;
}
}
@ -7255,7 +7255,7 @@ void ImGui::SetNextItemSelectionUserData(ImGuiSelectionUserData selection_user_d
{
// Auto updating RangeSrcPassedBy for cases were clipper is not used (done before ItemAdd() clipping)
g.NextItemData.ItemFlags |= ImGuiItemFlags_HasSelectionUserData | ImGuiItemFlags_IsMultiSelect;
if (ms->BeginIO.RangeSrcItem == (void*)selection_user_data)
if (ms->BeginIO.RangeSrcItem == selection_user_data)
ms->BeginIO.RangeSrcPassedBy = true;
}
else
@ -7273,7 +7273,7 @@ void ImGui::MultiSelectItemHeader(ImGuiID id, bool* p_selected)
ImGuiMultiSelectState* storage = ms->Storage;
IM_ASSERT(g.NextItemData.FocusScopeId == g.CurrentFocusScopeId && "Forgot to call SetNextItemSelectionUserData() prior to item, required in BeginMultiSelect()/EndMultiSelect() scope");
void* item_data = (void*)g.NextItemData.SelectionUserData;
ImGuiSelectionUserData item_data = g.NextItemData.SelectionUserData;
// Apply Clear/SelectAll requests requested by BeginMultiSelect().
// This is only useful if the user hasn't processed them already, and this only works if the user isn't using the clipper.
@ -7293,7 +7293,7 @@ void ImGui::MultiSelectItemHeader(ImGuiID id, bool* p_selected)
if (is_range_dst)
{
ms->RangeDstPassedBy = true;
if (storage->RangeSrcItem == (void*)-1) // If we don't have RangeSrc, assign RangeSrc = RangeDst
if (storage->RangeSrcItem == ImGuiSelectionUserData_Invalid) // If we don't have RangeSrc, assign RangeSrc = RangeDst
{
storage->RangeSrcItem = item_data;
storage->RangeSelected = selected ? 1 : 0;
@ -7302,7 +7302,7 @@ void ImGui::MultiSelectItemHeader(ImGuiID id, bool* p_selected)
const bool is_range_src = storage->RangeSrcItem == item_data;
if (is_range_src || is_range_dst || ms->BeginIO.RangeSrcPassedBy != ms->RangeDstPassedBy)
{
IM_ASSERT(storage->RangeSrcItem != (void*)-1 && storage->RangeSelected != -1);
IM_ASSERT(storage->RangeSrcItem != ImGuiSelectionUserData_Invalid && storage->RangeSelected != -1);
selected = (storage->RangeSelected != 0);
}
else if ((ms->KeyMods & ImGuiMod_Ctrl) == 0)
@ -7330,13 +7330,13 @@ void ImGui::MultiSelectItemFooter(ImGuiID id, bool* p_selected, bool* p_pressed)
if (!ms->IsFocused && !hovered)
return;
void* item_data = (void*)g.NextItemData.SelectionUserData;
ImGuiSelectionUserData item_data = g.NextItemData.SelectionUserData;
const bool is_multiselect = (ms->Flags & ImGuiMultiSelectFlags_SingleSelect) == 0;
bool is_ctrl = (ms->KeyMods & ImGuiMod_Ctrl) != 0;
bool is_shift = (ms->KeyMods & ImGuiMod_Shift) != 0;
if (g.NavId == id && storage->RangeSrcItem == (void*)-1)
if (g.NavId == id && storage->RangeSrcItem == ImGuiSelectionUserData_Invalid)
{
storage->RangeSrcItem = item_data;
storage->RangeSelected = selected; // Will be updated at the end of this function anyway.
@ -7398,7 +7398,7 @@ void ImGui::MultiSelectItemFooter(ImGuiID id, bool* p_selected, bool* p_pressed)
// Shift+Arrow always select
// Ctrl+Shift+Arrow copy source selection state (alrady stored by BeginMultiSelect() in RangeSelected)
//IM_ASSERT(storage->HasRangeSrc && storage->HasRangeValue);
ms->EndIO.RangeSrcItem = (storage->RangeSrcItem != (void*)-1) ? storage->RangeSrcItem : item_data;
ms->EndIO.RangeSrcItem = (storage->RangeSrcItem != ImGuiSelectionUserData_Invalid) ? storage->RangeSrcItem : item_data;
ms->EndIO.RangeSelected = (is_ctrl && storage->RangeSelected != -1) ? (storage->RangeSelected != 0) : true;
ms->EndIO.RangeDirection = ms->BeginIO.RangeSrcPassedBy ? +1 : -1;
}
@ -7459,8 +7459,8 @@ void ImGui::DebugNodeMultiSelectState(ImGuiMultiSelectState* storage)
if (!is_active) { PopStyleColor(); }
if (!open)
return;
Text("RangeSrcItem = %p, RangeSelected = %d", storage->RangeSrcItem, storage->RangeSelected);
Text("NavIdData = %p, NavIdSelected = %d", storage->NavIdItem, storage->NavIdSelected);
Text("RangeSrcItem = %p, RangeSelected = %d", (void*)storage->RangeSrcItem, storage->RangeSelected);
Text("NavIdData = %p, NavIdSelected = %d", (void*)storage->NavIdItem, storage->NavIdSelected);
TreePop();
#else
IM_UNUSED(storage);