Magpie/Runtime/UIDrawer.cpp
刘旭 bdc4088d59 feat: 创建一个 ImGUI backend 供 Magpie 使用
相比 win32 backend 相比主要的变化是光标位置的映射
2022-02-14 16:41:12 +08:00

83 lines
2 KiB
C++

#include "pch.h"
#include "UIDrawer.h"
#include "App.h"
#include "DeviceResources.h"
#include <imgui.h>
#include "imgui_impl_magpie.h"
#include "imgui_impl_dx11.h"
#include "Renderer.h"
#include "CursorDrawer.h"
UIDrawer::~UIDrawer() {
if (_handlerID != 0) {
App::GetInstance().UnregisterWndProcHandler(_handlerID);
}
ImGui_ImplDX11_Shutdown();
ImGui_ImplMagpie_Shutdown();
ImGui::DestroyContext();
}
bool UIDrawer::Initialize(ID3D11Texture2D* renderTarget) {
auto& dr = App::GetInstance().GetDeviceResources();
IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO();
io.ConfigFlags |= ImGuiConfigFlags_NavNoCaptureKeyboard | ImGuiConfigFlags_NoMouseCursorChange;
ImGui::StyleColorsDark();
ImGui_ImplMagpie_Init(App::GetInstance().GetHwndHost());
ImGui_ImplDX11_Init(dr.GetD3DDevice(), dr.GetD3DDC());
dr.GetRenderTargetView(renderTarget, &_rtv);
_handlerID = App::GetInstance().RegisterWndProcHandler(_WndProcHandler);
return true;
}
void UIDrawer::Draw() {
auto& io = ImGui::GetIO();
ImGui_ImplMagpie_NewFrame();
ImGui_ImplDX11_NewFrame();
ImGui::NewFrame();
if (io.WantCaptureMouse) {
if (!_cursorOnUI) {
HWND hwndHost = App::GetInstance().GetHwndHost();
LONG_PTR style = GetWindowLongPtr(hwndHost, GWL_EXSTYLE);
SetWindowLongPtr(hwndHost, GWL_EXSTYLE, style & ~WS_EX_TRANSPARENT);
_cursorOnUI = true;
}
} else {
if (_cursorOnUI) {
HWND hwndHost = App::GetInstance().GetHwndHost();
LONG_PTR style = GetWindowLongPtr(hwndHost, GWL_EXSTYLE);
SetWindowLongPtr(hwndHost, GWL_EXSTYLE, style | WS_EX_TRANSPARENT);
_cursorOnUI = false;
}
}
bool show = true;
ImGui::ShowDemoWindow(&show);
ImGui::Render();
auto& dr = App::GetInstance().GetDeviceResources();
App::GetInstance().GetDeviceResources().GetD3DDC()->OMSetRenderTargets(1, &_rtv, NULL);
ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
}
bool UIDrawer::_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
ImGui_ImplMagpie_WndProcHandler(hWnd, msg, wParam, lParam);
return false;
}