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Demo: BeginCombo() demo code

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This commit is contained in:
omar 2017-12-25 17:40:47 +01:00
parent 3849bb4470
commit 3d48f5b8c2
2 changed files with 22 additions and 5 deletions
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1
imgui.h
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@ -300,6 +300,7 @@ namespace ImGui
// Widgets: Combo Box // Widgets: Combo Box
// The new BeginCombo()/EndCombo() api allows you to manage your contents and selection state however you want it. // The new BeginCombo()/EndCombo() api allows you to manage your contents and selection state however you want it.
// The old Combo() api are helpers over BeginCombo()/EndCombo() which are kept available for convenience purpose.
IMGUI_API bool BeginCombo(const char* label, const char* preview_value, ImGuiComboFlags flags = 0); IMGUI_API bool BeginCombo(const char* label, const char* preview_value, ImGuiComboFlags flags = 0);
IMGUI_API void EndCombo(); IMGUI_API void EndCombo();
IMGUI_API bool Combo(const char* label, int* current_item, const char* const items[], int items_count, int popup_max_height_in_items = -1); IMGUI_API bool Combo(const char* label, int* current_item, const char* const items[], int items_count, int popup_max_height_in_items = -1);

26
imgui_demo.cpp
View File

@ -322,12 +322,28 @@ void ImGui::ShowDemoWindow(bool* p_open)
ImGui::LabelText("label", "Value"); ImGui::LabelText("label", "Value");
static int item = 1; {
ImGui::Combo("combo", &item, "aaaa\0bbbb\0cccc\0dddd\0eeee\0\0"); // Combo using values packed in a single constant string (for really quick combo) // Simplified one-liner Combo() API, using values packed in a single constant string
static int current_item_1 = 1;
ImGui::Combo("combo", &current_item_1, "aaaa\0bbbb\0cccc\0dddd\0eeee\0\0");
//ImGui::Combo("combo w/ array of char*", &current_item_2_idx, items, IM_ARRAYSIZE(items)); // Combo using proper array. You can also pass a callback to retrieve array value, no need to create/copy an array just for that.
const char* items[] = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK", "LLLLLLL", "MMMM", "OOOOOOO", "PPPP", "QQQQQQQQQQ", "RRR", "SSSS" }; // General BeginCombo() API, you have full control over your selection data and display type
static int item2 = -1; const char* items[] = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK", "LLLLLLL", "MMMM", "OOOOOOO", "PPPP", "QQQQQQQQQQ", "RRR", "SSSS" };
ImGui::Combo("combo scroll", &item2, items, IM_ARRAYSIZE(items)); // Combo using proper array. You can also pass a callback to retrieve array value, no need to create/copy an array just for that. static const char* current_item_2 = NULL;
if (ImGui::BeginCombo("combo 2", current_item_2)) // The second parameter is the label previewed before opening the combo.
{
for (int n = 0; n < IM_ARRAYSIZE(items); n++)
{
bool is_selected = (current_item_2 == items[n]); // You can store your selection however you want, outside or inside your objects
if (ImGui::Selectable(items[n], is_selected))
current_item_2 = items[n];
if (is_selected)
ImGui::SetItemDefaultFocus(); // Set the initial focus when opening the combo (scrolling + for keyboard navigation support in the upcoming navigation branch)
}
ImGui::EndCombo();
}
}
{ {
static char str0[128] = "Hello, world!"; static char str0[128] = "Hello, world!";