Comments (5)
thewoz
commented on July 2, 2024
1
I'm so sorry.
I understand what you mean.
Every time there is some thing I miss.
It's just that I still don't fully understand what the internal architecture of ImGui is.
So I by doing this:
if(ImGui::BeginMainMenuBar()) {
if(ImGui::BeginMenu("File")) {
ImGui::MenuItem("About", NULL, false, true);
ImGui::EndMenu();
}
ImGui::EndMainMenuBar();
}
I was already defining a menu in the "main" window.
So actually by putting this flag ImGuiWindowFlags_MenuBar I was adding another menu in the window that I was creating below
I was sure that putting ImGuiWindowFlags_MenuBar was to put the menu in the window I was creating here:
ImGui::Begin("MainWindow", NULL, windowFlags);
And that this was the code that was needed to make it work.
if(ImGui::BeginMainMenuBar()) {
if(ImGui::BeginMenu("File")) {
ImGui::MenuItem("About", NULL, false, true);
ImGui::EndMenu();
}
ImGui::EndMainMenuBar();
}
Anyway here is the complete corrected code.
thank you very much again.
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#define IMGUI_DEFINE_MATH_OPERATORS
#include <imgui/imgui.hpp>
static void glfwErrorCallback(int error, const char * description) {
fprintf(stderr, "GLFW error (%d): %s\n", error, description);
}
int main(int argc, const char * argv[]) {
if(!glfwInit()) {
fprintf(stderr, "GLFW init error\n");
exit(EXIT_FAILURE);
}
#if __APPLE__
const char* glsl_version = "#version 100";
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#else
const char* glsl_version = "#version 130";
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
#endif
glfwSetErrorCallback(glfwErrorCallback);
GLFWwindow * window = glfwCreateWindow(640, 480, "ImGui", NULL, NULL);
if(!window) {
glfwTerminate();
abort();
}
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
if(!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) abort();
IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGui_ImplGlfw_InitForOpenGL(window, true);
ImGui_ImplOpenGL3_Init(glsl_version);
ImGui::StyleColorsDark();
while(!glfwWindowShouldClose(window)) {
glfwPollEvents();
ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();
ImGuiViewport * viewport = ImGui::GetMainViewport();
ImGui::SetNextWindowPos(viewport->WorkPos);
ImGui::SetNextWindowSize(viewport->WorkSize);
ImGui::SetNextWindowViewport(viewport->ID);
ImGuiWindowFlags windowFlags = ImGuiWindowFlags_NoDocking | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoNavFocus | ImGuiWindowFlags_NoMove;
ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
ImGui::Begin("MainWindow", NULL, windowFlags);
ImGui::PopStyleVar();
if(ImGui::BeginMainMenuBar()) {
if(ImGui::BeginMenu("File")) {
ImGui::MenuItem("About", NULL, false, true);
ImGui::EndMenu();
}
ImGui::EndMainMenuBar();
}
float heightSideBar = ImGui::GetFrameHeight();
if(ImGui::BeginViewportSideBar("StatusBar", viewport, ImGuiDir_Down, heightSideBar, ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoSavedSettings | ImGuiWindowFlags_MenuBar)) {
if(ImGui::BeginMenuBar()) {
ImGui::Text("Status Bar:");
ImGui::EndMenuBar();
}
ImGui::End();
}
// right part red
ImGui::PushStyleColor(ImGuiCol_ChildBg, ImColor(255,0,0).Value);
ImGui::BeginChild("3", ImVec2(0, 0), true);
ImGui::PopStyleColor();
ImGui::EndChild();
ImGui::End();
ImGui::Render();
int displayW, displayH;
glfwGetFramebufferSize(window, &displayW, &displayH);
glViewport(0, 0, displayW, displayH);
static ImVec4 clearColor = ImColor(60, 55, 15);
glClearColor(clearColor.x, clearColor.y, clearColor.z, clearColor.w);
glClear(GL_COLOR_BUFFER_BIT);
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
glfwSwapBuffers(window);
}
ImGui_ImplOpenGL3_Shutdown();
ImGui_ImplGlfw_Shutdown();
ImGui::DestroyContext();
glfwDestroyWindow(window);
glfwTerminate();
return 0;
}
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ocornut
commented on July 2, 2024
ImGui::SetNextWindowPos(viewport->Pos);
ImGui::SetNextWindowSize(viewport->Size);
ImGui::SetNextWindowViewport(viewport->ID);
Your window is programmed to fill the entire viewport so that’s what it does. Bringing to front makes it appear over those bars.
You should use viewport->WorkPos and viewport->WorkSize to avoid overlapping menu bars and side bars.
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thewoz
commented on July 2, 2024
Hi @ocornut ,
thank you very much for the explanation.
I absolutely did not understand that was the problem.
I implemented what you suggested and indeed nothing disappears anymore.
What I don't understand is why the red part doesn't fill all the available space.
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ocornut
commented on July 2, 2024
Because your red window also has a Menubar as you passed ImGuiWindowFlags_MenuBar to it.
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ocornut
commented on July 2, 2024
Happy to help!
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