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◆ main openmsx / src / imgui / ImGuiLayer.cc
3.2 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "ImGuiLayer.hh"
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#include "ImGuiCpp.hh"
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#include "ImGuiManager.hh"
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#include "Keyboard.hh"
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#include "MSXMotherBoard.hh"
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#include "Reactor.hh"
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#include <imgui.h>
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#include <imgui_impl_opengl3.h>
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#include <imgui_impl_sdl2.h>
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#include <imgui_internal.h>
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#include <SDL.h>
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namespace openmsx {
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ImGuiLayer::ImGuiLayer(ImGuiManager& manager_)
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	: Layer(Layer::Coverage::PARTIAL, Layer::ZIndex::IMGUI)
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	, manager(manager_)
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{
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}
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void ImGuiLayer::paint(OutputSurface& /*surface*/)
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{
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	manager.preNewFrame();
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	// Start the Dear ImGui frame
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	ImGui_ImplOpenGL3_NewFrame();
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	ImGui_ImplSDL2_NewFrame();
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	ImGui::NewFrame();
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	// Allow docking in main window
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	auto* mainViewport = ImGui::GetMainViewport();
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	auto dockspaceId = 0;
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	im::StyleVar(ImGuiStyleVar_Alpha, /*transparent*/0.0f, [&]{
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		dockspaceId = ImGui::DockSpaceOverViewport(0, mainViewport,
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			ImGuiDockNodeFlags_NoDockingOverCentralNode |
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			ImGuiDockNodeFlags_PassthruCentralNode |
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			ImGuiDockNodeFlags_AutoHideTabBar);
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	});
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	// Main content window: focus target for the MSX display area.  Docked
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	// into central node so it receives clicks there.  When focused, we
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	// override WantCapture so input goes to the application (see
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	// ImGuiManager).
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	ImGui::SetNextWindowPos(mainViewport->Pos);
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	ImGui::SetNextWindowSize(mainViewport->Size);
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	auto flags = ImGuiWindowFlags_NoTitleBar |
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			ImGuiWindowFlags_NoBackground |
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			ImGuiWindowFlags_NoResize |
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			ImGuiWindowFlags_NoMove |
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			ImGuiWindowFlags_NoScrollbar |
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			ImGuiWindowFlags_NoCollapse |
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			ImGuiWindowFlags_NoBringToFrontOnFocus;
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	bool focus = false;
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	im::Window("MSX Display Area", nullptr, flags, [&]{
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		// Ensure this window has focus on startup (after other windows are loaded)
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		if (ImGui::GetFrameCount() == 1) {
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			ImGui::SetWindowFocus();
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		}
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		// If no other window currently has focus, then take it ourselves.
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		if (ImGui::GetCurrentContext()->NavWindow == nullptr) {
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			ImGui::SetWindowFocus();
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		}
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		focus = ImGui::IsWindowFocused(ImGuiFocusedFlags_RootWindow);
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		if (focus) {
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			ImGui::SetNextFrameWantCaptureMouse(false);
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			ImGui::SetNextFrameWantCaptureKeyboard(false);
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		}
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		if (auto* motherBoard = manager.getReactor().getMotherBoard()) {
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			if (auto* keyb = motherBoard->getKeyboard()) {
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				auto time = motherBoard->getCurrentTime();
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				keyb->setFocus(focus, time);
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			}
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		}
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	});
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	manager.paintImGui(focus);
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	// Rendering
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	const ImGuiIO& io = ImGui::GetIO();
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	ImGui::Render();
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	ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
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	// Update and Render additional Platform Windows
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	// (Platform functions may change the current OpenGL context, so we
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	// save/restore it to make it easier to paste this code elsewhere.
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	if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) {
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		SDL_Window* backup_current_window = SDL_GL_GetCurrentWindow();
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		SDL_GLContext backup_current_context = SDL_GL_GetCurrentContext();
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		ImGui::UpdatePlatformWindows();
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		ImGui::RenderPlatformWindowsDefault();
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		SDL_GL_MakeCurrent(backup_current_window, backup_current_context);
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#ifdef __APPLE__
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		if (ImGui::GetFrameCount() == 1) {
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			// On startup, bring main openMSX window to front, which it doesn't
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			// do it by itself due to creation of platform windows for viewports.
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			SDL_RaiseWindow(SDL_GetWindowFromID(WindowEvent::getMainWindowId()));
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		}
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#endif
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	}
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}
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} // namespace openmsx