Demo: Assets Browser: store items, sorting, type overlay.
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ocornut
parent
d18e57e673
commit
88df590145
146
imgui_demo.cpp
146
imgui_demo.cpp
@ -2770,7 +2770,7 @@ static const char* ExampleNames[] =
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{
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"Artichoke", "Arugula", "Asparagus", "Avocado", "Bamboo Shoots", "Bean Sprouts", "Beans", "Beet", "Belgian Endive", "Bell Pepper",
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"Bitter Gourd", "Bok Choy", "Broccoli", "Brussels Sprouts", "Burdock Root", "Cabbage", "Calabash", "Capers", "Carrot", "Cassava",
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"Cauliflower", "Celery", "Celery Root", "Celcuce", "Chayote", "Celtuce", "Chayote", "Chinese Broccoli", "Corn", "Cucumber"
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"Cauliflower", "Celery", "Celery Root", "Celcuce", "Chayote", "Chinese Broccoli", "Corn", "Cucumber"
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};
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// Our multi-selection system doesn't make assumption about:
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@ -9640,19 +9640,84 @@ void ShowExampleAppDocuments(bool* p_open)
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//#include "imgui_internal.h" // NavMoveRequestTryWrapping()
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struct ExampleAsset
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{
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int ID;
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int Type;
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ExampleAsset(int id, int type) { ID = id; Type = type; }
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static const ImGuiTableSortSpecs* s_current_sort_specs;
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static void SortWithSortSpecs(ImGuiTableSortSpecs* sort_specs, ExampleAsset* items, int items_count)
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{
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s_current_sort_specs = sort_specs; // Store in variable accessible by the sort function.
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if (items_count > 1)
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qsort(items, (size_t)items_count, sizeof(items[0]), ExampleAsset::CompareWithSortSpecs);
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s_current_sort_specs = NULL;
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}
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// Compare function to be used by qsort()
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static int IMGUI_CDECL CompareWithSortSpecs(const void* lhs, const void* rhs)
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{
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const ExampleAsset* a = (const ExampleAsset*)lhs;
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const ExampleAsset* b = (const ExampleAsset*)rhs;
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for (int n = 0; n < s_current_sort_specs->SpecsCount; n++)
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{
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const ImGuiTableColumnSortSpecs* sort_spec = &s_current_sort_specs->Specs[n];
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int delta = 0;
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if (sort_spec->ColumnIndex == 0)
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delta = (a->ID - b->ID);
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else if (sort_spec->ColumnIndex == 1)
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delta = (a->Type - b->Type);
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if (delta > 0)
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return (sort_spec->SortDirection == ImGuiSortDirection_Ascending) ? +1 : -1;
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if (delta < 0)
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return (sort_spec->SortDirection == ImGuiSortDirection_Ascending) ? -1 : +1;
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}
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return (a->ID - b->ID);
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}
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};
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const ImGuiTableSortSpecs* ExampleAsset::s_current_sort_specs = NULL;
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struct ExampleAssetsBrowser
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{
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// Options
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bool ShowTypeOverlay = true;
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float IconSize = 32.0f;
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int IconSpacing = 7;
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bool StretchSpacing = true;
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// State
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int ItemsCount = 10000;
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ExampleSelection Selection;
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float IconSize = 32.0f;
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int IconSpacing = 7;
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bool StretchSpacing = true;
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float ZoomWheelAccum = 0.0f;
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ImVector<ExampleAsset> Items;
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ExampleSelection Selection;
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int NextItemId = 0;
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bool SortDirty = false;
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float ZoomWheelAccum = 0.0f;
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// Functions
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ExampleAssetsBrowser()
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{
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AddItems(10000);
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}
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void AddItems(int count)
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{
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if (Items.Size == 0)
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NextItemId = 0;
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Items.reserve(Items.Size + count);
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for (int n = 0; n < count; n++, NextItemId++)
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Items.push_back(ExampleAsset(NextItemId, (NextItemId % 20) < 15 ? 0 : (NextItemId % 20) < 18 ? 1 : 2));
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SortDirty = true;
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}
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void ClearItems()
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{
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Items.clear();
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Selection.Clear();
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}
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void Draw(const char* title, bool* p_open)
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{
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ImGui::SetNextWindowSize(ImVec2(IconSize * 25, IconSize * 15), ImGuiCond_FirstUseEver);
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if (!ImGui::Begin(title, p_open, ImGuiWindowFlags_MenuBar))
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{
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ImGui::End();
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@ -9664,6 +9729,11 @@ struct ExampleAssetsBrowser
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{
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if (ImGui::BeginMenu("File"))
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{
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if (ImGui::MenuItem("Add 10000 items"))
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AddItems(10000);
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if (ImGui::MenuItem("Clear items"))
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ClearItems();
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ImGui::Separator();
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if (ImGui::MenuItem("Close", NULL, false, p_open != NULL))
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*p_open = false;
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ImGui::EndMenu();
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@ -9671,6 +9741,11 @@ struct ExampleAssetsBrowser
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if (ImGui::BeginMenu("Options"))
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{
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ImGui::PushItemWidth(ImGui::GetFontSize() * 10);
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ImGui::SeparatorText("Contents");
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ImGui::Checkbox("Show Type Overlay", &ShowTypeOverlay);
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ImGui::SeparatorText("Layout");
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ImGui::SliderFloat("Icon Size", &IconSize, 16.0f, 128.0f, "%.0f");
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ImGui::SliderInt("Icon Spacing", &IconSpacing, 0, 32);
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ImGui::Checkbox("Stretch Spacing", &StretchSpacing);
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@ -9697,22 +9772,24 @@ struct ExampleAssetsBrowser
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}
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// Show a table with ONLY one header row to showcase the idea/possibility of using this to provide a sorting UI
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// FIXME-MULTISELECT: Showcase sorting.
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ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
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ImGuiTableFlags table_flags_for_sort_specs = ImGuiTableFlags_Sortable | ImGuiTableFlags_SortMulti | ImGuiTableFlags_SizingFixedFit | ImGuiTableFlags_Borders;
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if (ImGui::BeginTable("for_sort_specs_only", 3, table_flags_for_sort_specs, ImVec2(0.0f, ImGui::GetFrameHeight())))
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if (ImGui::BeginTable("for_sort_specs_only", 2, table_flags_for_sort_specs, ImVec2(0.0f, ImGui::GetFrameHeight())))
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{
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ImGui::TableSetupColumn("Index");
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ImGui::TableSetupColumn("Color");
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ImGui::TableSetupColumn("Type");
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ImGui::TableHeadersRow();
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if (ImGuiTableSortSpecs* sort_specs = ImGui::TableGetSortSpecs())
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sort_specs->SpecsDirty = false; // No actual sorting in this demo yet
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if (sort_specs->SpecsDirty || SortDirty)
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{
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ExampleAsset::SortWithSortSpecs(sort_specs, Items.Data, Items.Size);
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sort_specs->SpecsDirty = SortDirty = false;
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}
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ImGui::EndTable();
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}
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ImGui::PopStyleVar();
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if (ImGui::BeginChild("Assets", ImVec2(0, 0), true, ImGuiWindowFlags_NoMove))
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if (ImGui::BeginChild("Assets", ImVec2(0, -ImGui::GetTextLineHeightWithSpacing()), true, ImGuiWindowFlags_NoMove))
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{
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ImDrawList* draw_list = ImGui::GetWindowDrawList();
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const ImVec2 item_size(floorf(IconSize), floorf(IconSize));
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@ -9723,7 +9800,7 @@ struct ExampleAssetsBrowser
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// Layout: calculate number of icon per line and number of lines
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const int column_count = IM_MAX((int)(avail_width / (item_size.x + IconSpacing)), 1);
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const int line_count = (ItemsCount + column_count - 1) / column_count;
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const int line_count = (Items.Size + column_count - 1) / column_count;
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// Layout: when stretching: allocate remaining space to more spacing. Round before division, so item_spacing may be non-integer.
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if (StretchSpacing && column_count > 1)
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@ -9736,10 +9813,12 @@ struct ExampleAssetsBrowser
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ImGui::SetCursorScreenPos(start_pos);
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// Multi-select
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ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_ClearOnClickWindowVoid;
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ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(flags);
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ImGuiMultiSelectFlags ms_flags = ImGuiMultiSelectFlags_ClearOnEscape | ImGuiMultiSelectFlags_ClearOnClickWindowVoid;
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ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(ms_flags);
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ExampleSelectionAdapter selection_adapter;
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Selection.ApplyRequests(ms_io, &selection_adapter, ItemsCount);
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selection_adapter.Data = this;
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selection_adapter.IndexToStorage = [](ExampleSelectionAdapter* self_, int idx) { ExampleAssetsBrowser* self = (ExampleAssetsBrowser*)self_->Data; return (ImGuiID)self->Items[idx].ID; };
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Selection.ApplyRequests(ms_io, &selection_adapter, Items.Size);
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// Altering ItemSpacing may seem unnecessary as we position every items using SetCursorScreenPos()...
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// But it is necessary for two reasons:
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@ -9747,6 +9826,12 @@ struct ExampleAssetsBrowser
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// - The vertical spacing would be measured by Clipper to calculate line height if we didn't provide it explicitly (here we do).
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ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(item_spacing, item_spacing));
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// Rendering parameters
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const ImU32 icon_bg_color = IM_COL32(48, 48, 48, 128);
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const ImU32 icon_type_overlay_colors[3] = { 0, IM_COL32(200, 70, 70, 255), IM_COL32(70, 170, 70, 255) };
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const ImVec2 icon_type_overlay_size = ImVec2(4.0f, 4.0f);
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const bool display_label = (item_size.x >= ImGui::CalcTextSize("999").x);
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const float line_height = item_size.y + item_spacing;
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ImGuiListClipper clipper;
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clipper.Begin(line_count, line_height);
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@ -9757,10 +9842,11 @@ struct ExampleAssetsBrowser
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for (int line_idx = clipper.DisplayStart; line_idx < clipper.DisplayEnd; line_idx++)
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{
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const int item_min_idx_for_current_line = line_idx * column_count;
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const int item_max_idx_for_current_line = IM_MIN((line_idx + 1) * column_count, ItemsCount);
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const int item_max_idx_for_current_line = IM_MIN((line_idx + 1) * column_count, Items.Size);
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for (int item_idx = item_min_idx_for_current_line; item_idx < item_max_idx_for_current_line; ++item_idx)
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{
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ImGui::PushID(item_idx);
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ExampleAsset* item_data = &Items[item_idx];
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ImGui::PushID(item_data->ID);
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// Position item
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ImVec2 pos = ImVec2(start_pos.x + (item_idx % column_count) * (item_size.x + item_spacing), start_pos.y + (line_idx * line_height));
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@ -9771,9 +9857,9 @@ struct ExampleAssetsBrowser
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ImVec2 box_max(box_min.x + item_size.x + 2, box_min.y + item_size.y + 2);
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draw_list->AddRect(box_min, box_max, IM_COL32(90, 90, 90, 255));
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bool item_is_selected = Selection.Contains((ImGuiID)item_idx);
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ImGui::SetNextItemSelectionUserData(item_idx);
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ImGui::Selectable("##select", item_is_selected, ImGuiSelectableFlags_None, item_size);
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bool item_is_selected = Selection.Contains((ImGuiID)item_data->ID);
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ImGui::Selectable("", item_is_selected, ImGuiSelectableFlags_None, item_size);
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// Update our selection state immediately (without waiting for EndMultiSelect() requests)
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// because we use this to alter the color of our text/icon.
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@ -9798,10 +9884,19 @@ struct ExampleAssetsBrowser
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}
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// A real app would likely display an image/thumbnail here.
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char label[32];
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sprintf(label, "%d", item_idx);
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draw_list->AddRectFilled(box_min, box_max, IM_COL32(48, 48, 48, 128));
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draw_list->AddText(ImVec2(box_min.x, box_max.y - ImGui::GetFontSize()), item_is_selected ? IM_COL32(255, 255, 255, 255) : ImGui::GetColorU32(ImGuiCol_TextDisabled), label);
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draw_list->AddRectFilled(box_min, box_max, icon_bg_color);
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if (ShowTypeOverlay && item_data->Type != 0)
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{
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ImU32 type_col = icon_type_overlay_colors[item_data->Type % IM_ARRAYSIZE(icon_type_overlay_colors)];
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draw_list->AddRectFilled(ImVec2(box_max.x - 2 - icon_type_overlay_size.x, box_min.y + 2), ImVec2(box_max.x - 2, box_min.y + 2 + icon_type_overlay_size.y), type_col);
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}
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if (display_label)
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{
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ImU32 label_col = item_is_selected ? IM_COL32(255, 255, 255, 255) : ImGui::GetColorU32(ImGuiCol_TextDisabled);
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char label[32];
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sprintf(label, "%d", item_data->ID);
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draw_list->AddText(ImVec2(box_min.x, box_max.y - ImGui::GetFontSize()), label_col, label);
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}
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ImGui::PopID();
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}
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@ -9811,13 +9906,14 @@ struct ExampleAssetsBrowser
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ImGui::PopStyleVar(); // ImGuiStyleVar_ItemSpacing
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ms_io = ImGui::EndMultiSelect();
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Selection.ApplyRequests(ms_io, &selection_adapter, ItemsCount);
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Selection.ApplyRequests(ms_io, &selection_adapter, Items.Size);
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// FIXME-MULTISELECT: Find a way to expose this in public API. This currently requires "imgui_internal.h"
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//ImGui::NavMoveRequestTryWrapping(ImGui::GetCurrentWindow(), ImGuiNavMoveFlags_WrapX);
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}
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ImGui::EndChild();
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ImGui::Text("Selected: %d/%d items", Selection.Size, Items.Size);
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ImGui::End();
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}
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};
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