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MultiSelect: Further simplication of user code to support Deletion.

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Provide standard RequestFocusItem storage.
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ocornut
2023-06-02 15:29:55 +02:00
parent df1eeb9a20
commit c0035705ca
3 changed files with 48 additions and 38 deletions
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7
imgui.h
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@@ -2777,18 +2777,19 @@ 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 implemention of 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.
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 / ms:r // (If using deletion) Set before EndMultiSelect() to reset ResetSrcItem (e.g. if deleted selection).
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 / / ms:w app:r // (If using deletion) Last known SetNextItemSelectionUserData() value 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).
ImGuiMultiSelectIO() { Clear(); }
void Clear() { memset(this, 0, sizeof(*this)); }
void Clear() { memset(this, 0, sizeof(*this)); RequestFocusItem = NavIdItem = RangeSrcItem = RangeDstItem = (void*)-1; }
};
//-----------------------------------------------------------------------------