imgui_impl_wt.cpp

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#include <imgui.h>
#include <imgui_internal.h>
 
#include "imgui_impl_wt.h"
#include "imgui_impl_opengl3.h"
 
#include <Wt/WEvent.h>
 
ImGuiBackendWt::ImGuiBackendWt(Wt::WContainerWidget* parent)
{
    IMGUI_CHECKVERSION();
    ctx = ImGui::CreateContext();
    ImGui::SetCurrentContext(ctx);
 
    const char* glsl_version = "#version 130";
    ImGui_ImplOpenGL3_Init(glsl_version);
}
 
ImGuiBackendWt::~ImGuiBackendWt()
{
    ImGui::SetCurrentContext(ctx);
    ImGui_ImplOpenGL3_Shutdown();
    ImGui::DestroyContext(ctx);
}
 
void ImGuiBackendWt::NewFrame(int width, int height)
{
    ImGui::SetCurrentContext(ctx);
    auto& io = ImGui::GetIO();
    io.DisplaySize.x = width;
    io.DisplaySize.y = height;
 
    ImGui_ImplOpenGL3_NewFrame();
    ImGui::NewFrame();
 
    //while (ctx->InputEventsQueue.Size > 0)
    //{
    //  ImGui::EndFrame();
    //  ImGui::NewFrame();
    //}
}
 
void ImGuiBackendWt::Render()
{
    ImGui::Render();
    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
}
 
bool ImGuiBackendWt::handleMousePressed(const Wt::WMouseEvent& evt)
{
    auto& io = ctx->IO;
    int button = -1;
    if (evt.button() == Wt::MouseButton::Left) button = 0;
    if (evt.button() == Wt::MouseButton::Right) button = 1;
    if (evt.button() == Wt::MouseButton::Middle) button = 2;
    //io.AddMousePosEvent(evt.widget().x, evt.widget().y);
    io.MousePos = ImVec2(evt.widget().x, evt.widget().y);
    io.AddMouseButtonEvent(button, true);
    return io.WantCaptureMouse;
}
 
bool ImGuiBackendWt::handleMouseDrag(const Wt::WMouseEvent& evt)
{
    auto& io = ctx->IO;
    io.AddMousePosEvent(evt.widget().x, evt.widget().y);
    return io.WantCaptureMouse;
}
 
bool ImGuiBackendWt::handleMouseReleased(const Wt::WMouseEvent& evt)
{
    auto& io = ctx->IO;
    int button = -1;
    if (evt.button() == Wt::MouseButton::Left) button = 0;
    if (evt.button() == Wt::MouseButton::Right) button = 1;
    if (evt.button() == Wt::MouseButton::Middle) button = 2;
    //io.AddMousePosEvent(evt.widget().x, evt.widget().y);
    io.MousePos = ImVec2(evt.widget().x, evt.widget().y);
    io.AddMouseButtonEvent(button, false);
    return io.WantCaptureMouse;
}