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MultiSelect: made SetNextItemSelectionData() optional to allow disjoint selection (e.g. with a CollapsingHeader between items). Amend demo.

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ocornut 2023-05-20 15:51:39 +02:00
parent 815c61b82e
commit d2f208a30c
3 changed files with 29 additions and 22 deletions
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4
imgui.h
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@ -2766,14 +2766,14 @@ enum ImGuiMultiSelectFlags_
// 1) Call BeginMultiSelect() with the last saved value of ->RangeSrc and its selection state.
// It is because you need to pass its selection state (and you own selection) that we don't store this value in Dear ImGui.
// (For the initial frame or when resetting your selection state: you may use the value for your first item or a "null" value that matches the type stored in your void*).
// 2) Honor Clear/SelectAll requests by updating your selection data. Only required if you are using a clipper in step 4: but you can use same code as step 6 anyway.
// 2) Honor Clear/SelectAll/SetRange requests by updating your selection data. (Only required if you are using a clipper in step 4: but you can use same code as step 6 anyway.)
// Loop
// 3) Set RangeSrcPassedBy=true if the RangeSrc item is part of the items clipped before the first submitted/visible item. [Only required if you are using a clipper in step 4]
// 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 everywhere, this is easy to compute: if (clipper.DisplayStart > (int)data->RangeSrc) { data->RangeSrcPassedBy = true; }
// 4) Submit your items with SetNextItemSelectionUserData() + Selectable()/TreeNode() calls.
// Call IsItemToggledSelection() to query if the selection state has been toggled, if you need the info immediately for your display (before EndMultiSelect()).
// When cannot return a "IsItemSelected()" value because we need to consider clipped/unprocessed items, this is why we return a "Toggle" event instead.
// When cannot provide a "IsItemSelected()" value because we need to consider clipped/unprocessed items, this is why we return a "Toggled" event instead.
// End
// 5) Call EndMultiSelect(). Save the value of ->RangeSrc for the next frame (you may convert the value in a format that is safe for persistance)
// 6) Honor Clear/SelectAll/SetRange requests by updating your selection data. Always process them in this order (as you will receive Clear+SetRange request simultaneously)

40
imgui_demo.cpp
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@ -2830,6 +2830,7 @@ static void ShowDemoWindowMultiSelect()
ImGui::TreePop();
}
// Demonstrate implementation a most-basic form of multi-selection manually
IMGUI_DEMO_MARKER("Widgets/Selection State/Multiple Selection (simplfied, manual)");
if (ImGui::TreeNode("Multiple Selection (simplified, manual)"))
{
@ -2841,9 +2842,9 @@ static void ShowDemoWindowMultiSelect()
sprintf(buf, "Object %d", n);
if (ImGui::Selectable(buf, selection[n]))
{
if (!ImGui::GetIO().KeyCtrl) // Clear selection when CTRL is not held
if (!ImGui::GetIO().KeyCtrl) // Clear selection when CTRL is not held
memset(selection, 0, sizeof(selection));
selection[n] ^= 1;
selection[n] ^= 1; // Toggle current item
}
}
ImGui::TreePop();
@ -2883,7 +2884,6 @@ static void ShowDemoWindowMultiSelect()
{
char label[64];
sprintf(label, "Object %05d: %s", n, random_names[n % IM_ARRAYSIZE(random_names)]);
bool item_is_selected = selection.GetSelected(n);
ImGui::SetNextItemSelectionUserData(n);
ImGui::Selectable(label, item_is_selected);
@ -2916,28 +2916,36 @@ static void ShowDemoWindowMultiSelect()
enum WidgetType { WidgetType_Selectable, WidgetType_TreeNode };
static bool use_table = false;
static bool use_drag_drop = true;
static bool multiple_selection_scopes = false;
static bool use_multiple_scopes = false;
static ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_None;
static WidgetType widget_type = WidgetType_TreeNode;
if (ImGui::RadioButton("Selectables", widget_type == WidgetType_Selectable)) { widget_type = WidgetType_Selectable; }
ImGui::SameLine();
if (ImGui::RadioButton("Tree nodes", widget_type == WidgetType_TreeNode)) { widget_type = WidgetType_TreeNode; }
ImGui::Checkbox("Use table", &use_table);
ImGui::Checkbox("Use drag & drop", &use_drag_drop);
ImGui::Checkbox("Distinct selection scopes in same window", &multiple_selection_scopes);
ImGui::Checkbox("Multiple selection scopes in same window", &use_multiple_scopes);
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoMultiSelect", &flags, ImGuiMultiSelectFlags_NoMultiSelect);
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoUnselect", &flags, ImGuiMultiSelectFlags_NoUnselect);
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_NoSelectAll", &flags, ImGuiMultiSelectFlags_NoSelectAll);
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_ClearOnEscape", &flags, ImGuiMultiSelectFlags_ClearOnEscape);
ImGui::BeginDisabled(use_multiple_scopes);
ImGui::CheckboxFlags("ImGuiMultiSelectFlags_ClearOnClickWindowVoid", &flags, ImGuiMultiSelectFlags_ClearOnClickWindowVoid);
ImGui::EndDisabled();
// When 'multiple_selection_scopes' is set we show 3 selection scopes in the host window instead of 1 in a scrolling window.
// When 'use_multiple_scopes' is set we show 3 selection scopes in the host window instead of 1 in a scrolling window.
static ExampleSelection selections_data[3];
const int selection_scope_count = multiple_selection_scopes ? 3 : 1;
const int selection_scope_count = use_multiple_scopes ? 3 : 1;
for (int selection_scope_n = 0; selection_scope_n < selection_scope_count; selection_scope_n++)
{
ExampleSelection* selection = &selections_data[selection_scope_n];
const int ITEMS_COUNT = multiple_selection_scopes ? 12 : 1000;
const int ITEMS_COUNT = use_multiple_scopes ? 12 : 1000; // Smaller count to make it easier to see multiple scopes in same screen.
ImGui::PushID(selection_scope_n);
// Open a scrolling region
bool draw_selection = true;
if (multiple_selection_scopes)
if (use_multiple_scopes)
{
ImGui::SeparatorText("Selection scope");
}
@ -2952,15 +2960,13 @@ static void ShowDemoWindowMultiSelect()
if (widget_type == WidgetType_TreeNode)
ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(ImGui::GetStyle().ItemSpacing.x, 0.0f));
ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_None;
if (multiple_selection_scopes)
;// flags |= ImGuiMultiSelectFlags_ClearOnClickRectVoid;
else
flags |= ImGuiMultiSelectFlags_ClearOnClickWindowVoid;
ImGuiMultiSelectData* multi_select_data = ImGui::BeginMultiSelect(flags, (void*)(intptr_t)selection->RangeRef, selection->GetSelected(selection->RangeRef));
ImGuiMultiSelectFlags local_flags = flags;
if (use_multiple_scopes)
local_flags &= ~ImGuiMultiSelectFlags_ClearOnClickWindowVoid; // local_flags |= ImGuiMultiSelectFlags_ClearOnClickRectVoid;
ImGuiMultiSelectData* multi_select_data = ImGui::BeginMultiSelect(local_flags, (void*)(intptr_t)selection->RangeRef, selection->GetSelected(selection->RangeRef));
selection->ApplyRequests(multi_select_data, ITEMS_COUNT);
if (multiple_selection_scopes)
if (use_multiple_scopes)
ImGui::Text("Selection size: %d", selection->GetSelectionSize()); // Draw counter below Separator and after BeginMultiSelect()
if (use_table)
@ -3062,7 +3068,7 @@ static void ShowDemoWindowMultiSelect()
if (widget_type == WidgetType_TreeNode)
ImGui::PopStyleVar();
if (multiple_selection_scopes == false)
if (use_multiple_scopes == false)
ImGui::EndListBox();
}
ImGui::PopID(); // ImGui::PushID(selection_scope_n);

7
imgui_widgets.cpp
View File

@ -6391,6 +6391,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiID storage_id, ImGuiTreeNodeFlags
// Compute open and multi-select states before ItemAdd() as it clear NextItem data.
bool is_open = TreeNodeUpdateNextOpen(storage_id, flags);
const bool is_multi_select = (g.NextItemData.Flags & ImGuiNextItemDataFlags_HasSelectionData) != 0; // Before ItemAdd()
bool item_add = ItemAdd(interact_bb, id);
g.LastItemData.StatusFlags |= ImGuiItemStatusFlags_HasDisplayRect;
g.LastItemData.DisplayRect = frame_bb;
@ -6464,7 +6465,6 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiID storage_id, ImGuiTreeNodeFlags
const bool was_selected = selected;
// Multi-selection support (header)
const bool is_multi_select = (g.MultiSelectState.Window == window);
if (is_multi_select)
{
MultiSelectItemHeader(id, &selected);
@ -6780,7 +6780,9 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
}
const bool disabled_item = (flags & ImGuiSelectableFlags_Disabled) != 0;
const bool is_multi_select = (g.NextItemData.Flags & ImGuiNextItemDataFlags_HasSelectionData) != 0; // Before ItemAdd()
const bool item_add = ItemAdd(bb, id, NULL, disabled_item ? (ImGuiItemFlags)ImGuiItemFlags_Disabled : ImGuiItemFlags_None);
if (span_all_columns)
{
window->ClipRect.Min.x = backup_clip_rect_min_x;
@ -6816,7 +6818,6 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
if ((flags & ImGuiSelectableFlags_AllowOverlap) || (g.LastItemData.InFlags & ImGuiItemFlags_AllowOverlap)) { button_flags |= ImGuiButtonFlags_AllowOverlap; }
// Multi-selection support (header)
const bool is_multi_select = (g.MultiSelectState.Window == window);
const bool was_selected = selected;
if (is_multi_select)
{
@ -7166,7 +7167,7 @@ ImGuiMultiSelectData* ImGui::BeginMultiSelect(ImGuiMultiSelectFlags flags, void*
ms->In.RequestSelectAll = true;
if (flags & ImGuiMultiSelectFlags_ClearOnEscape)
if (Shortcut(ImGuiKey_Escape))
if (Shortcut(ImGuiKey_Escape)) // FIXME-MULTISELECT: Only hog shortcut if selection is not null, meaning we need "has selection or "selection size" data here.
ms->In.RequestClear = true;
}