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Demo: Dual List Box: Added a dual list box (6648)

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ocornut 2023-08-23 15:53:50 +02:00
parent ba698df7bb
commit dce02f5c4b
1 changed files with 170 additions and 13 deletions
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183
imgui_demo.cpp
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@ -2761,6 +2761,13 @@ static void ShowDemoWindowWidgets()
}
}
static const char* ExampleNames[] =
{
"Artichoke", "Arugula", "Asparagus", "Avocado", "Bamboo Shoots", "Bean Sprouts", "Beans", "Beet", "Belgian Endive", "Bell Pepper",
"Bitter Gourd", "Bok Choy", "Broccoli", "Brussels Sprouts", "Burdock Root", "Cabbage", "Calabash", "Capers", "Carrot", "Cassava",
"Cauliflower", "Celery", "Celery Root", "Celcuce", "Chayote", "Celtuce", "Chayote", "Chinese Broccoli", "Corn", "Cucumber"
};
// Our multi-selection system doesn't make assumption about:
// - how you want to identify items in multi-selection API? Indices(*) / Custom Identifiers / Pointers ?
// - how you want to store persistent selection data? Indices / Custom Identifiers(*) / Pointers ?
@ -2858,7 +2865,7 @@ struct ExampleSelection
QueueDeletion = false;
// If focused item is not selected...
const int focused_idx = adapter->UserDataToIndex(adapter, ms_io->NavIdItem); // Index of currently focused item
const int focused_idx = (int)ms_io->NavIdItem; // Index of currently focused item
if (ms_io->NavIdSelected == false) // This is merely a shortcut, == Contains(adapter->IndexToStorage(items, focused_idx))
{
ms_io->RangeSrcReset = true; // Request to recover RangeSrc from NavId next frame. Would be ok to reset even when NavIdSelected==true, but it would take an extra frame to recover RangeSrc when deleting a selected item.
@ -2905,6 +2912,147 @@ struct ExampleSelection
}
};
// Example: Implement dual list box storage and interface
struct ExampleDualListBox
{
ImVector<ImGuiID> Items[2]; // ID is index into ExampleName[]
ExampleSelection Selections[2]; // Store ExampleItemId into selection
bool OptKeepSorted = true;
void MoveAll(int src, int dst)
{
IM_ASSERT((src == 0 && dst == 1) || (src == 1 && dst == 0));
for (ImGuiID item_id : Items[src])
Items[dst].push_back(item_id);
Items[src].clear();
SortItems(dst);
Selections[src].Swap(Selections[dst]);
Selections[src].Clear();
}
void MoveSelected(int src, int dst)
{
for (int src_n = 0; src_n < Items[src].Size; src_n++)
{
ImGuiID item_id = Items[src][src_n];
if (!Selections[src].Contains(item_id))
continue;
Items[src].erase(&Items[src][src_n]); // FIXME-OPT: Could be implemented more optimally (rebuild src items and swap)
Items[dst].push_back(item_id);
src_n--;
}
if (OptKeepSorted)
SortItems(dst);
Selections[src].Swap(Selections[dst]);
Selections[src].Clear();
}
void ApplySelectionRequests(ImGuiMultiSelectIO* ms_io, int side)
{
// In this example we store item id in selection (instead of item index)
ExampleSelectionAdapter adapter;
adapter.Data = Items[side].Data;
adapter.IndexToStorage = [](ExampleSelectionAdapter* self, int idx) { return (ImGuiID)((ImGuiID*)self->Data)[idx]; };
Selections[side].ApplyRequests(ms_io, &adapter, Items[side].Size);
}
static int IMGUI_CDECL CompareItemsByValue(const void* lhs, const void* rhs)
{
const int* a = (const int*)lhs;
const int* b = (const int*)rhs;
return (*a - *b) > 0 ? +1 : -1;
}
void SortItems(int n)
{
qsort(Items[n].Data, (size_t)Items[n].Size, sizeof(Items[n][0]), CompareItemsByValue);
}
void Show()
{
ImGui::Checkbox("Sorted", &OptKeepSorted);
if (ImGui::BeginTable("split", 3, ImGuiTableFlags_None))
{
ImGui::TableSetupColumn("", ImGuiTableColumnFlags_WidthStretch); // Left side
ImGui::TableSetupColumn("", ImGuiTableColumnFlags_WidthFixed); // Buttons
ImGui::TableSetupColumn("", ImGuiTableColumnFlags_WidthStretch); // Right side
ImGui::TableNextRow();
int request_move_selected = -1;
int request_move_all = -1;
for (int side = 0; side < 2; side++)
{
// FIXME-MULTISELECT: Dual List Box: Add context menus
// FIXME-NAV: Using ImGuiWindowFlags_NavFlattened exhibit many issues.
ImVector<ImGuiID>& items = Items[side];
ExampleSelection& selection = Selections[side];
ImGui::TableSetColumnIndex((side == 0) ? 0 : 2);
ImGui::Text("%s (%d)", (side == 0) ? "Available" : "Basket", items.Size);
// Submit scrolling range to avoid glitches on moving/deletion
const float items_height = ImGui::GetTextLineHeightWithSpacing();
ImGui::SetNextWindowContentSize(ImVec2(0.0f, items.Size * items_height));
if (ImGui::BeginChild(ImGui::GetID(side ? "1" : "0"), ImVec2(-FLT_MIN, ImGui::GetFontSize() * 20), ImGuiChildFlags_FrameStyle))
{
ImGuiMultiSelectFlags flags = ImGuiMultiSelectFlags_None;
ImGuiMultiSelectIO* ms_io = ImGui::BeginMultiSelect(flags);
ApplySelectionRequests(ms_io, side);
for (int item_n = 0; item_n < items.Size; item_n++)
{
ImGuiID item_id = items[item_n];
bool item_is_selected = selection.Contains(item_id);
ImGui::SetNextItemSelectionUserData(item_n);
ImGui::Selectable(ExampleNames[item_id], item_is_selected, ImGuiSelectableFlags_AllowDoubleClick);
if (ImGui::IsItemFocused())
{
// FIXME-MULTISELECT: Dual List Box: Transfer focus
if (ImGui::IsKeyPressed(ImGuiKey_Enter) || ImGui::IsKeyPressed(ImGuiKey_KeypadEnter))
request_move_selected = side;
if (ImGui::IsMouseDoubleClicked(0)) // FIXME-MULTISELECT: Double-click on multi-selection?
request_move_selected = side;
}
}
ms_io = ImGui::EndMultiSelect();
ApplySelectionRequests(ms_io, side);
}
ImGui::EndChild();
}
// Buttons columns
ImGui::TableSetColumnIndex(1);
ImGui::NewLine();
//ImVec2 button_sz = { ImGui::CalcTextSize(">>").x + ImGui::GetStyle().FramePadding.x * 2.0f, ImGui::GetFrameHeight() + padding.y * 2.0f };
ImVec2 button_sz = { ImGui::GetFrameHeight(), ImGui::GetFrameHeight() };
// (Using BeginDisabled()/EndDisabled() works but feels distracting given how it is currently visualized)
if (ImGui::Button(">>", button_sz))
request_move_all = 0;
if (ImGui::Button(">", button_sz))
request_move_selected = 0;
if (ImGui::Button("<", button_sz))
request_move_selected = 1;
if (ImGui::Button("<<", button_sz))
request_move_all = 1;
// Process requests
if (request_move_all != -1)
MoveAll(request_move_all, request_move_all ^ 1);
if (request_move_selected != -1)
MoveSelected(request_move_selected, request_move_selected ^ 1);
// FIXME-MULTISELECT: action from outside
if (OptKeepSorted == false)
{
ImGui::NewLine();
if (ImGui::ArrowButton("MoveUp", ImGuiDir_Up)) {}
if (ImGui::ArrowButton("MoveDown", ImGuiDir_Down)) {}
}
ImGui::EndTable();
}
}
};
static void ShowDemoWindowMultiSelect()
{
IMGUI_DEMO_MARKER("Widgets/Selection State & Multi-Select");
@ -2947,13 +3095,6 @@ static void ShowDemoWindowMultiSelect()
ImGui::TreePop();
}
static const char* random_names[] =
{
"Artichoke", "Arugula", "Asparagus", "Avocado", "Bamboo Shoots", "Bean Sprouts", "Beans", "Beet", "Belgian Endive", "Bell Pepper",
"Bitter Gourd", "Bok Choy", "Broccoli", "Brussels Sprouts", "Burdock Root", "Cabbage", "Calabash", "Capers", "Carrot", "Cassava",
"Cauliflower", "Celery", "Celery Root", "Celcuce", "Chayote", "Celtuce", "Chayote", "Chinese Broccoli", "Corn", "Cucumber"
};
// Demonstrate holding/updating multi-selection data using the BeginMultiSelect/EndMultiSelect API.
// SHIFT+Click w/ CTRL and other standard features are supported.
IMGUI_DEMO_MARKER("Widgets/Selection State/Multi-Select");
@ -2982,7 +3123,7 @@ static void ShowDemoWindowMultiSelect()
for (int n = 0; n < ITEMS_COUNT; n++)
{
char label[64];
sprintf(label, "Object %05d: %s", n, random_names[n % IM_ARRAYSIZE(random_names)]);
sprintf(label, "Object %05d: %s", n, ExampleNames[n % IM_ARRAYSIZE(ExampleNames)]);
bool item_is_selected = selection.Contains((ImGuiID)n);
ImGui::SetNextItemSelectionUserData(n);
ImGui::Selectable(label, item_is_selected);
@ -3023,7 +3164,7 @@ static void ShowDemoWindowMultiSelect()
for (int n = clipper.DisplayStart; n < clipper.DisplayEnd; n++)
{
char label[64];
sprintf(label, "Object %05d: %s", n, random_names[n % IM_ARRAYSIZE(random_names)]);
sprintf(label, "Object %05d: %s", n, ExampleNames[n % IM_ARRAYSIZE(ExampleNames)]);
bool item_is_selected = selection.Contains((ImGuiID)n);
ImGui::SetNextItemSelectionUserData(n);
ImGui::Selectable(label, item_is_selected);
@ -3092,7 +3233,7 @@ static void ShowDemoWindowMultiSelect()
{
const int item_id = items[n];
char label[64];
sprintf(label, "Object %05d: %s", item_id, random_names[item_id % IM_ARRAYSIZE(random_names)]);
sprintf(label, "Object %05d: %s", item_id, ExampleNames[item_id % IM_ARRAYSIZE(ExampleNames)]);
bool item_is_selected = selection.Contains((ImGuiID)n);
ImGui::SetNextItemSelectionUserData(n);
@ -3112,6 +3253,22 @@ static void ShowDemoWindowMultiSelect()
ImGui::TreePop();
}
// Implement a Dual List Box (#6648)
IMGUI_DEMO_MARKER("Widgets/Selection State/Multi-Select (dual list box)");
if (ImGui::TreeNode("Multi-Select (dual list box)"))
{
// Init default state
static ExampleDualListBox dlb;
if (dlb.Items[0].Size == 0 && dlb.Items[1].Size == 0)
for (int item_id = 0; item_id < IM_ARRAYSIZE(ExampleNames); item_id++)
dlb.Items[0].push_back((ImGuiID)item_id);
// Show
dlb.Show();
ImGui::TreePop();
}
// Demonstrate individual selection scopes in same window
IMGUI_DEMO_MARKER("Widgets/Selection State/Multi-Select (multiple scopes)");
if (ImGui::TreeNode("Multi-Select (multiple scopes)"))
@ -3135,7 +3292,7 @@ static void ShowDemoWindowMultiSelect()
for (int n = 0; n < ITEMS_COUNT; n++)
{
char label[64];
sprintf(label, "Object %05d: %s", n, random_names[n % IM_ARRAYSIZE(random_names)]);
sprintf(label, "Object %05d: %s", n, ExampleNames[n % IM_ARRAYSIZE(ExampleNames)]);
bool item_is_selected = selection->Contains((ImGuiID)n);
ImGui::SetNextItemSelectionUserData(n);
ImGui::Selectable(label, item_is_selected);
@ -3239,7 +3396,7 @@ static void ShowDemoWindowMultiSelect()
ImGui::TableNextColumn();
const int item_id = items[n];
const char* item_category = random_names[item_id % IM_ARRAYSIZE(random_names)];
const char* item_category = ExampleNames[item_id % IM_ARRAYSIZE(ExampleNames)];
char label[64];
sprintf(label, "Object %05d: %s", item_id, item_category);