add keyboard input via CCIMEDispatcher

Author: matcool

src/backend.cpp

@@ -1,5 +1,6 @@
 #include <cocos2d.h>
 #include <Geode/modify/CCTouchDispatcher.hpp>
+#include <Geode/modify/CCIMEDispatcher.hpp>
 #include "platform/platform.hpp"
 #include "DevTools.hpp"
 #include "ImGui.hpp"
@@ -197,4 +198,25 @@ class $modify(CCTouchDispatcher) {
             }
         }
     }
+};
+
+class $modify(CCIMEDispatcher) {
+    void dispatchInsertText(const char* text, int len) {
+        auto& io = ImGui::GetIO();
+        if (!io.WantCaptureKeyboard) {
+            CCIMEDispatcher::dispatchInsertText(text, len);
+        }
+        std::string str(text, len);
+        io.AddInputCharactersUTF8(str.c_str());
+    }
+
+    void dispatchDeleteBackward() {
+        auto& io = ImGui::GetIO();
+        if (!io.WantCaptureKeyboard) {
+            CCIMEDispatcher::dispatchDeleteBackward();
+        }
+        // is this really how youre supposed to do this
+        io.AddKeyEvent(ImGuiKey_Backspace, true);
+        io.AddKeyEvent(ImGuiKey_Backspace, false);
+    }
 };

src/platform/Win32.cpp

@@ -6,12 +6,44 @@
 #include "platform.hpp"
 
 using namespace cocos2d;
+using namespace geode;
+
+ImGuiKey keyFromGLFW(int key) {
+    if (key >= GLFW_KEY_0 && key <= GLFW_KEY_9) {
+        return static_cast<ImGuiKey>(ImGuiKey_0 + (key - GLFW_KEY_0));
+    } else if (key >= GLFW_KEY_A && key <= GLFW_KEY_Z) {
+        return static_cast<ImGuiKey>(ImGuiKey_A + (key - GLFW_KEY_A));
+    }
+    switch (key) {
+        case GLFW_KEY_SPACE: return ImGuiKey_Space;
+        case GLFW_KEY_BACKSPACE: return ImGuiKey_Backspace;
+        case GLFW_KEY_COMMA: return ImGuiKey_Comma;
+        case GLFW_KEY_LEFT: return ImGuiKey_LeftArrow;
+        case GLFW_KEY_RIGHT: return ImGuiKey_RightArrow;
+        case GLFW_KEY_UP: return ImGuiKey_UpArrow;
+        case GLFW_KEY_DOWN: return ImGuiKey_DownArrow;
+        case GLFW_KEY_ESCAPE: return ImGuiKey_Escape;
+        case GLFW_KEY_LEFT_SHIFT: return ImGuiKey_LeftShift;
+        case GLFW_KEY_RIGHT_SHIFT: return ImGuiKey_RightShift;
+        case GLFW_KEY_LEFT_CONTROL: return ImGuiKey_LeftCtrl;
+        case GLFW_KEY_LEFT_ALT: return ImGuiKey_LeftAlt;
+        // TODO: rest :-)
+    }
+    return ImGuiKey_None;
+}
 
 class $modify(CCEGLView) {
     void updateWindow(int width, int height) {
         shouldUpdateGDRenderBuffer() = true;
         CCEGLView::updateWindow(width, height);
     }
+
+    void onGLFWKeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods) {
+        auto& io = ImGui::GetIO();
+        CCEGLView::onGLFWKeyCallback(window, key, scancode, action, mods);
+        // in practice this is only used for arrow keys
+        io.AddKeyEvent(keyFromGLFW(key), action != GLFW_RELEASE);
+    }
 };
 
 #endif