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Drag and Drop: implement simple item reordering API.

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This commit is contained in:
Rokas Kupstys 2021-10-11 15:52:01 +03:00
parent d768b8c812
commit 713adaa4e2
4 changed files with 111 additions and 0 deletions
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48
imgui_demo.cpp
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@ -2285,6 +2285,54 @@ static void ShowDemoWindowWidgets()
ImGui::TreePop();
}
IMGUI_DEMO_MARKER("Widgets/Drag and Drop/Drag to reorder items (api)");
if (ImGui::TreeNode("Drag to reorder items (api)"))
{
HelpMarker("Drag items to reorder them.");
static const char* item_names[] = { "Item One", "Item Two", "Item Three", "Item Four", "Item Five" };
static bool vertical = true;
ImGui::Checkbox("Vertical", &vertical);
int swap_n = 0;
int swap_d = 0;
for (int n = 0; n < IM_ARRAYSIZE(item_names); n++)
{
const char* item = item_names[n];
if (vertical)
{
ImGui::Selectable(item);
}
else
{
ImGui::Button(item);
if (n + 1 < IM_ARRAYSIZE(item_names))
ImGui::SameLine();
}
// Called after reorderable item. "SomeId" is optional in this simple example, but may be used to
// avoid mixing multiple distinct reorderable lists when they exist in same id scope.
if (int swap_direction = ImGui::ItemReorder("SomeId", vertical))
{
swap_n = n;
swap_d = swap_direction;
}
}
// Defer swap after rendering in order to avoid rendering glitches when items of different length are
// swapped in a horizontal list.
if (swap_d != 0)
{
const char* item = item_names[swap_n];
int next_n = swap_n + swap_d;
if (next_n >= 0 && next_n < IM_ARRAYSIZE(item_names))
{
item_names[swap_n] = item_names[next_n];
item_names[next_n] = item;
}
}
ImGui::TreePop();
}
ImGui::TreePop();
}