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Make classes not depend on the implicit GImGui context (#6199, #5856, #6199): ImGuiIO

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This commit is a preparation toward adding ImGui apis with explicit context
and making ImGui applications being able to use multiple context at the same time
whatever their concurrency model.

About ImGuiIO:
- ImGuiIO depends on ImGuiContext because some of its method want to event to `g.InputEventQueue`.
- To make ImGuiIO aware of the context to use, context which creates the ImGuiIO is given as argument of ImGuiIO constructor.
- The assert `IM_ASSERT(&g.IO == this && "Can only add events to current context.")` has been removed since it does not make sense anymore

NOTE: ImGuiIO could be completely independent of ImGuiContext if the InputEventQueue was moved from ImGuiContext to ImGuiIO, but since
ImGuiIO is a public class it would expose InputEvent type. Solving this problem is out of the current scope, but it is interesting to notice.
This commit is contained in:
Marc Delorme
2022-11-01 20:35:05 +09:00
committed by ocornut
parent 5a1e6b60a2
commit 10ace228bc
4 changed files with 20 additions and 15 deletions
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8
imgui_internal.h
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@ -1052,7 +1052,7 @@ struct IMGUI_API ImGuiMenuColumns
// For a given item ID, access with ImGui::GetInputTextState()
struct IMGUI_API ImGuiInputTextState
{
ImGuiContext* Ctx; // parent dear imgui context
ImGuiContext* Ctx; // parent UI context (needs to be set explicitly by parent).
ImGuiID ID; // widget id owning the text state
int CurLenW, CurLenA; // we need to maintain our buffer length in both UTF-8 and wchar format. UTF-8 length is valid even if TextA is not.
ImVector<ImWchar> TextW; // edit buffer, we need to persist but can't guarantee the persistence of the user-provided buffer. so we copy into own buffer.
@ -1068,7 +1068,7 @@ struct IMGUI_API ImGuiInputTextState
bool Edited; // edited this frame
ImGuiInputTextFlags Flags; // copy of InputText() flags. may be used to check if e.g. ImGuiInputTextFlags_Password is set.
ImGuiInputTextState(ImGuiContext* ctx) { memset(this, 0, sizeof(*this)); Ctx = ctx;}
ImGuiInputTextState() { memset(this, 0, sizeof(*this)); }
void ClearText() { CurLenW = CurLenA = 0; TextW[0] = 0; TextA[0] = 0; CursorClamp(); }
void ClearFreeMemory() { TextW.clear(); TextA.clear(); InitialTextA.clear(); }
int GetUndoAvailCount() const { return Stb.undostate.undo_point; }
@ -2013,8 +2013,10 @@ struct ImGuiContext
ImVector<char> TempBuffer; // Temporary text buffer
ImGuiContext(ImFontAtlas* shared_font_atlas)
: InputTextState(this)
{
IO.Ctx = this;
InputTextState.Ctx = this;
Initialized = false;
FontAtlasOwnedByContext = shared_font_atlas ? false : true;
Font = NULL;