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BeginPopupContextItem() now supports a NULL string identifier and uses the last item ID if available. For interactive items (that have an ID) this works! For non interactive items we assert.

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This commit is contained in:
omar 2017-10-16 23:36:34 +02:00
parent c76f014292
commit 1a35766356
3 changed files with 23 additions and 13 deletions
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25
imgui.cpp
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@ -3697,38 +3697,43 @@ void ImGui::EndPopup()
PopStyleVar();
}
// This is a helper to handle the most simple case of associating one named popup to one given widget.
// This is a helper to handle the simplest case of associating one named popup to one given widget.
// 1. If you have many possible popups (for different "instances" of a same widget, or for wholly different widgets), you may be better off handling
// this yourself so you can store data relative to the widget that opened the popup instead of choosing different popup identifiers.
// 2. If you want right-clicking on the same item to reopen the popup at new location, use the same code replacing IsItemHovered() with IsItemRectHovered()
// and passing true to the OpenPopupEx().
// Because: hovering an item in a window below the popup won't normally trigger is hovering behavior/coloring. The pattern of ignoring the fact that
// the item can be interacted with (because it is blocked by the active popup) may useful in some situation when e.g. large canvas as one item, content of menu
// driven by click position.
// This is because hovering an item in a window below the popup won't work. IsItemRectHovered() skips this test.
// The pattern of ignoring the fact that the item can be interacted with (because it is blocked by the active popup) may useful in some situation
// when e.g. large canvas where the content of menu driven by click position.
bool ImGui::BeginPopupContextItem(const char* str_id, int mouse_button)
{
ImGuiWindow* window = GImGui->CurrentWindow;
ImGuiID id = str_id ? window->GetID(str_id) : window->DC.LastItemId; // If user hasn't passed an ID, we can use the LastItemID. Using LastItemID as a Popup ID won't conflict!
IM_ASSERT(id != 0); // However, you cannot pass a NULL str_id if the last item has no identifier (e.g. a Text() item)
if (IsItemHovered() && IsMouseClicked(mouse_button))
OpenPopupEx(GImGui->CurrentWindow->GetID(str_id), false);
return BeginPopup(str_id);
OpenPopupEx(id, false);
return BeginPopupEx(id, 0);
}
bool ImGui::BeginPopupContextWindow(const char* str_id, int mouse_button, bool also_over_items)
{
if (!str_id)
str_id = "window_context";
ImGuiID id = GImGui->CurrentWindow->GetID(str_id);
if (IsWindowRectHovered() && IsMouseClicked(mouse_button))
if (also_over_items || !IsAnyItemHovered())
OpenPopupEx(GImGui->CurrentWindow->GetID(str_id), true);
return BeginPopup(str_id);
OpenPopupEx(id, true);
return BeginPopupEx(id, 0);
}
bool ImGui::BeginPopupContextVoid(const char* str_id, int mouse_button)
{
if (!str_id)
str_id = "void_context";
ImGuiID id = GImGui->CurrentWindow->GetID(str_id);
if (!IsAnyWindowHovered() && IsMouseClicked(mouse_button))
OpenPopupEx(GImGui->CurrentWindow->GetID(str_id), true);
return BeginPopup(str_id);
OpenPopupEx(id, true);
return BeginPopupEx(id, 0);
}
static bool BeginChildEx(const char* name, ImGuiID id, const ImVec2& size_arg, bool border, ImGuiWindowFlags extra_flags)

2
imgui.h
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@ -392,7 +392,7 @@ namespace ImGui
IMGUI_API void OpenPopup(const char* str_id); // call to mark popup as open (don't call every frame!). popups are closed when user click outside, or if CloseCurrentPopup() is called within a BeginPopup()/EndPopup() block. By default, Selectable()/MenuItem() are calling CloseCurrentPopup(). Popup identifiers are relative to the current ID-stack (so OpenPopup and BeginPopup needs to be at the same level).
IMGUI_API bool BeginPopup(const char* str_id); // return true if the popup is open, and you can start outputting to it. only call EndPopup() if BeginPopup() returned true!
IMGUI_API bool BeginPopupModal(const char* name, bool* p_open = NULL, ImGuiWindowFlags extra_flags = 0); // modal dialog (block interactions behind the modal window, can't close the modal window by clicking outside)
IMGUI_API bool BeginPopupContextItem(const char* str_id, int mouse_button = 1); // helper to open and begin popup when clicked on last item. read comments in .cpp!
IMGUI_API bool BeginPopupContextItem(const char* str_id = NULL, int mouse_button = 1); // helper to open and begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
IMGUI_API bool BeginPopupContextWindow(const char* str_id = NULL, int mouse_button = 1, bool also_over_items = true); // helper to open and begin popup when clicked on current window.
IMGUI_API bool BeginPopupContextVoid(const char* str_id = NULL, int mouse_button = 1); // helper to open and begin popup when clicked in void (no window).
IMGUI_API void EndPopup();

9
imgui_demo.cpp
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@ -1402,6 +1402,11 @@ void ImGui::ShowTestWindow(bool* p_open)
if (ImGui::TreeNode("Context menus"))
{
// BeginPopupContextItem() is a helper to provide common/simple popup behavior of essentially doing:
// if (IsItemHovered() && IsMouseClicked(0))
// OpenPopup(id);
// return BeginPopup(id);
// For more advanced uses you may want to replicate and cuztomize this code. This the comments inside BeginPopupContextItem() implementation.
static float value = 0.5f;
ImGui::Text("Value = %.3f (<-- right-click here)", value);
if (ImGui::BeginPopupContextItem("item context menu"))
@ -1413,9 +1418,9 @@ void ImGui::ShowTestWindow(bool* p_open)
}
static char name[32] = "Label1";
char buf[64]; sprintf(buf, "Button: %s###Button", name); // ### operator override ID ignoring the preceeding label
char buf[64]; sprintf(buf, "Button: %s###Button", name); // ### operator override ID ignoring the preceding label
ImGui::Button(buf);
if (ImGui::BeginPopupContextItem("rename context menu"))
if (ImGui::BeginPopupContextItem()) // When used after an item that has an ID (here the Button), we can skip providing an ID to BeginPopupContextItem().
{
ImGui::Text("Edit name:");
ImGui::InputText("##edit", name, IM_ARRAYSIZE(name));