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MultiSelect: added ImGuiSelectionExternalStorage helper. Simplify bool demo.

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This commit is contained in:
ocornut 2024-06-05 19:00:13 +02:00
parent f9caf4447a
commit db4898cb91
3 changed files with 39 additions and 22 deletions
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16
imgui.h
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@ -44,7 +44,7 @@ Index of this file:
// [SECTION] ImGuiIO
// [SECTION] Misc data structures (ImGuiInputTextCallbackData, ImGuiSizeCallbackData, ImGuiPayload)
// [SECTION] Helpers (ImGuiOnceUponAFrame, ImGuiTextFilter, ImGuiTextBuffer, ImGuiStorage, ImGuiListClipper, Math Operators, ImColor)
// [SECTION] Multi-Select API flags and structures (ImGuiMultiSelectFlags, ImGuiMultiSelectIO, ImGuiSelectionRequest, ImGuiSelectionBasicStorage)
// [SECTION] Multi-Select API flags and structures (ImGuiMultiSelectFlags, ImGuiMultiSelectIO, ImGuiSelectionRequest, ImGuiSelectionBasicStorage, ImGuiSelectionExternalStorage)
// [SECTION] Drawing API (ImDrawCallback, ImDrawCmd, ImDrawIdx, ImDrawVert, ImDrawChannel, ImDrawListSplitter, ImDrawFlags, ImDrawListFlags, ImDrawList, ImDrawData)
// [SECTION] Font API (ImFontConfig, ImFontGlyph, ImFontGlyphRangesBuilder, ImFontAtlasFlags, ImFontAtlas, ImFont)
// [SECTION] Viewports (ImGuiViewportFlags, ImGuiViewport)
@ -180,6 +180,7 @@ struct ImGuiOnceUponAFrame; // Helper for running a block of code not mo
struct ImGuiPayload; // User data payload for drag and drop operations
struct ImGuiPlatformImeData; // Platform IME data for io.PlatformSetImeDataFn() function.
struct ImGuiSelectionBasicStorage; // Optional helper to store multi-selection state + apply multi-selection requests.
struct ImGuiSelectionExternalStorage;//Optional helper to apply multi-selection requests to existing randomly accessible storage.
struct ImGuiSelectionRequest; // A selection request (stored in ImGuiMultiSelectIO)
struct ImGuiSizeCallbackData; // Callback data when using SetNextWindowSizeConstraints() (rare/advanced use)
struct ImGuiStorage; // Helper for key->value storage (container sorted by key)
@ -2860,6 +2861,19 @@ struct ImGuiSelectionBasicStorage
ImGuiID GetStorageIdFromIndex(int idx) { return AdapterIndexToStorageId(this, idx); }
};
// Optional helper to apply multi-selection requests to existing randomly accessible storage.
// Convenient if you want to quickly wire multi-select API on e.g. an array of bool or items storing their own selection state.
struct ImGuiSelectionExternalStorage
{
// Members
void (*AdapterSetItemSelected)(ImGuiSelectionExternalStorage* self, int idx, bool selected); // e.g. AdapterSetItemSelected = [](ImGuiSelectionExternalStorage* self, int idx, bool selected) { ((MyItems**)self->UserData)[idx]->Selected = selected; }
void* UserData; // User data for use by adapter function // e.g. selection.UserData = (void*)my_items;
// Methods
ImGuiSelectionExternalStorage() { memset(this, 0, sizeof(*this)); }
IMGUI_API void ApplyRequests(ImGuiMultiSelectIO* ms_io); // Generic function, using AdapterSetItemSelected()
};
//-----------------------------------------------------------------------------
// [SECTION] Drawing API (ImDrawCmd, ImDrawIdx, ImDrawVert, ImDrawChannel, ImDrawListSplitter, ImDrawListFlags, ImDrawList, ImDrawData)
// Hold a series of drawing commands. The user provides a renderer for ImDrawData which essentially contains an array of ImDrawList.

29
imgui_demo.cpp
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@ -3212,41 +3212,28 @@ static void ShowDemoWindowMultiSelect()
ImGui::BulletText("Shift+Keyboard to copy current value to other boxes.");
// If you have an array of checkboxes, you may want to use NoAutoSelect + NoAutoClear and the ImGuiSelectionExternalStorage helper.
static bool values[20] = {};
static bool items[20] = {};
static ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_NoAutoSelect | ImGuiMultiSelectFlags_NoAutoClear | ImGuiMultiSelectFlags_ClearOnEscape;
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoAutoSelect", &flags, ImGuiMultiSelectFlags_NoAutoSelect);
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoAutoClear", &flags, ImGuiMultiSelectFlags_NoAutoClear);
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_BoxSelect", &flags, ImGuiMultiSelectFlags_BoxSelect); // Cannot use ImGuiMultiSelectFlags_BoxSelect1d as checkboxes are varying width.
struct Funcs
{
static void ApplyMultiSelectRequestsToBoolArray(ImGuiMultiSelectIO* ms_io, bool items[], int items_count)
{
for (ImGuiSelectionRequest& req : ms_io->Requests)
{
if (req.Type == ImGuiSelectionRequestType_SetAll)
for (int n = 0; n < items_count; n++)
items[n] = req.Selected;
else if (req.Type == ImGuiSelectionRequestType_SetRange)
for (int n = (int)req.RangeFirstItem; n <= (int)req.RangeLastItem; n++)
items[n] = req.Selected;
}
}
};
if (ImGui::BeginChild("##Basket", ImVec2(-FLT_MIN, ImGui::GetFontSize() * 20), ImGuiChildFlags_Border | ImGuiChildFlags_ResizeY))
{
ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(flags);
Funcs::ApplyMultiSelectRequestsToBoolArray(ms_io, values, IM_ARRAYSIZE(values)); //// By specs, it could be optional to apply requests from BeginMultiSelect() if not using a clipper.
ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(flags, -1, IM_ARRAYSIZE(items));
ImGuiSelectionExternalStorage storage_wrapper;
storage_wrapper.UserData = (void*)items;
storage_wrapper.AdapterSetItemSelected = [](ImGuiSelectionExternalStorage* self, int n, bool selected) { bool* array = (bool*)self->UserData; array[n] = selected; };
storage_wrapper.ApplyRequests(ms_io);
for (int n = 0; n < 20; n++)
{
char label[32];
sprintf(label, "Item %d", n);
ImGui::SetNextItemSelectionUserData(n);
ImGui::Checkbox(label, &values[n]);
ImGui::Checkbox(label, &items[n]);
}
ms_io = ImGui::EndMultiSelect();
Funcs::ApplyMultiSelectRequestsToBoolArray(ms_io, values, IM_ARRAYSIZE(values));
storage_wrapper.ApplyRequests(ms_io);
}
ImGui::EndChild();

16
imgui_widgets.cpp
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@ -7854,6 +7854,22 @@ void ImGuiSelectionBasicStorage::ApplyRequests(ImGuiMultiSelectIO* ms_io)
}
}
// Apply requests coming from BeginMultiSelect() and EndMultiSelect().
// We also pull 'ms_io->ItemsCount' as passed for BeginMultiSelect() for consistency with ImGuiSelectionBasicStorage
// This makes no assumption about underlying storage.
void ImGuiSelectionExternalStorage::ApplyRequests(ImGuiMultiSelectIO* ms_io)
{
IM_ASSERT(AdapterSetItemSelected);
for (ImGuiSelectionRequest& req : ms_io->Requests)
{
if (req.Type == ImGuiSelectionRequestType_SetAll)
for (int idx = 0; idx < ms_io->ItemsCount; idx++)
AdapterSetItemSelected(this, idx, req.Selected);
if (req.Type == ImGuiSelectionRequestType_SetRange)
for (int idx = (int)req.RangeFirstItem; idx <= (int)req.RangeLastItem; idx++)
AdapterSetItemSelected(this, idx, req.Selected);
}
}
//-------------------------------------------------------------------------
// [SECTION] Widgets: ListBox