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◆ main openmsx / src / 3rdparty / imgui / imgui_stdlib.cc
3.8 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
// dear imgui: wrappers for C++ standard library (STL) types (std::string, etc.)
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// This is also an example of how you may wrap your own similar types.
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// TL;DR; this is using the ImGuiInputTextFlags_CallbackResize facility,
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// which also demonstrated in 'Dear ImGui Demo->Widgets->Text Input->Resize Callback'.
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// Changelog:
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// - v0.10: Initial version. Added InputText() / InputTextMultiline() calls with std::string
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// Usage:
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// {
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//   #include "misc/cpp/imgui_stdlib.h"
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//   #include "misc/cpp/imgui_stdlib.cpp" // <-- If you want to include implementation without messing with your project/build.
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//   [...]
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//   std::string my_string;
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//   ImGui::InputText("my string", &my_string);
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// }
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// See more C++ related extension (fmt, RAII, syntactic sugar) on Wiki:
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//   https://github.com/ocornut/imgui/wiki/Useful-Extensions#cness
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#include "imgui.h"
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#ifndef IMGUI_DISABLE
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#include "imgui_stdlib.h"
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// Clang warnings with -Weverything
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#if defined(__clang__)
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
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#endif
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struct InputTextCallback_UserData
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{
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    std::string*            Str;
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    ImGuiInputTextCallback  ChainCallback;
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    void*                   ChainCallbackUserData;
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};
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static int InputTextCallback(ImGuiInputTextCallbackData* data)
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{
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    InputTextCallback_UserData* user_data = (InputTextCallback_UserData*)data->UserData;
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    if (data->EventFlag == ImGuiInputTextFlags_CallbackResize)
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    {
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        // Resize string callback
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        // If for some reason we refuse the new length (BufTextLen) and/or capacity (BufSize) we need to set them back to what we want.
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        std::string* str = user_data->Str;
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        IM_ASSERT(data->Buf == str->c_str());
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        str->resize(data->BufTextLen);
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        data->Buf = (char*)str->c_str();
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    }
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    else if (user_data->ChainCallback)
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    {
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        // Forward to user callback, if any
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        data->UserData = user_data->ChainCallbackUserData;
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        return user_data->ChainCallback(data);
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    }
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    return 0;
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}
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bool ImGui::InputText(const char* label, std::string* str, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
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{
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    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
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    flags |= ImGuiInputTextFlags_CallbackResize;
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    InputTextCallback_UserData cb_user_data;
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    cb_user_data.Str = str;
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    cb_user_data.ChainCallback = callback;
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    cb_user_data.ChainCallbackUserData = user_data;
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    return InputText(label, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
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}
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bool ImGui::InputTextMultiline(const char* label, std::string* str, const ImVec2& size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
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{
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    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
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    flags |= ImGuiInputTextFlags_CallbackResize;
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    InputTextCallback_UserData cb_user_data;
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    cb_user_data.Str = str;
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    cb_user_data.ChainCallback = callback;
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    cb_user_data.ChainCallbackUserData = user_data;
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    return InputTextMultiline(label, (char*)str->c_str(), str->capacity() + 1, size, flags, InputTextCallback, &cb_user_data);
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}
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bool ImGui::InputTextWithHint(const char* label, const char* hint, std::string* str, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
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{
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    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
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    flags |= ImGuiInputTextFlags_CallbackResize;
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    InputTextCallback_UserData cb_user_data;
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    cb_user_data.Str = str;
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    cb_user_data.ChainCallback = callback;
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    cb_user_data.ChainCallbackUserData = user_data;
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    return InputTextWithHint(label, hint, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
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}
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#if defined(__clang__)
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#pragma clang diagnostic pop
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#endif
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#endif // #ifndef IMGUI_DISABLE