Added io.KeyAlt + support in examples apps

Currently unused but supported by sample so that more people will have
it set up when menus needs them

examples/directx11_example/imgui_impl_dx11.cpp

@@ -455,6 +455,7 @@ void ImGui_ImplDX11_NewFrame()
     // Read keyboard modifiers inputs
     io.KeyCtrl = (GetKeyState(VK_CONTROL) & 0x8000) != 0;
     io.KeyShift = (GetKeyState(VK_SHIFT) & 0x8000) != 0;
+    io.KeyAlt = (GetKeyState(VK_MENU) & 0x8000) != 0;
     // io.KeysDown : filled by WM_KEYDOWN/WM_KEYUP events
     // io.MousePos : filled by WM_MOUSEMOVE events
     // io.MouseDown : filled by WM_*BUTTON* events

examples/directx11_example/main.cpp

@@ -117,6 +117,10 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
             ImGui_ImplDX11_CreateDeviceObjects();
         }
         return 0;
+    case WM_SYSCOMMAND:
+        if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu
+            return 0;
+        break;
     case WM_DESTROY:
         PostQuitMessage(0);
         return 0;

examples/directx9_example/imgui_impl_dx9.cpp

@@ -276,6 +276,7 @@ void ImGui_ImplDX9_NewFrame()
     // Read keyboard modifiers inputs
     io.KeyCtrl = (GetKeyState(VK_CONTROL) & 0x8000) != 0;
     io.KeyShift = (GetKeyState(VK_SHIFT) & 0x8000) != 0;
+    io.KeyAlt = (GetKeyState(VK_MENU) & 0x8000) != 0;
     // io.KeysDown : filled by WM_KEYDOWN/WM_KEYUP events
     // io.MousePos : filled by WM_MOUSEMOVE events
     // io.MouseDown : filled by WM_*BUTTON* events

examples/directx9_example/main.cpp

@@ -30,6 +30,10 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
             ImGui_ImplDX9_CreateDeviceObjects();
         }
         return 0;
+    case WM_SYSCOMMAND:
+        if ((wParam & 0xfff0) == SC_KEYMENU) // Disable ALT application menu
+            return 0;
+        break;
     case WM_DESTROY:
         PostQuitMessage(0);
         return 0;

examples/opengl3_example/imgui_impl_glfw_gl3.cpp

@@ -143,6 +143,7 @@ void ImGui_ImplGlfwGL3_KeyCallback(GLFWwindow* window, int key, int scancode, in
         io.KeysDown[key] = false;
     io.KeyCtrl = (mods & GLFW_MOD_CONTROL) != 0;
     io.KeyShift = (mods & GLFW_MOD_SHIFT) != 0;
+    io.KeyAlt = (mods & GLFW_MOD_ALT) != 0;
 }
 
 void ImGui_ImplGlfwGL3_CharCallback(GLFWwindow* window, unsigned int c)

examples/opengl_example/imgui_impl_glfw.cpp

@@ -123,6 +123,7 @@ void ImGui_ImplGlFw_KeyCallback(GLFWwindow* window, int key, int scancode, int a
         io.KeysDown[key] = false;
     io.KeyCtrl = (mods & GLFW_MOD_CONTROL) != 0;
     io.KeyShift = (mods & GLFW_MOD_SHIFT) != 0;
+    io.KeyAlt = (mods & GLFW_MOD_ALT) != 0;
 }
 
 void ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c)

imgui.cpp

@@ -314,6 +314,7 @@
  - input: support track pad style scrolling & slider edit.
  - tooltip: move to fit within screen (e.g. when mouse cursor is right of the screen).
  - portability: big-endian test/support (github issue #81)
+ - misc: let user copy any window content to clipboard easily (CTRL+C on windows? while moving it? context menu?)
  - misc: mark printf compiler attributes on relevant functions
  - misc: provide a way to compile out the entire implementation while providing a dummy API (e.g. #define IMGUI_DUMMY_IMPL)
  - misc: double-clicking on title bar to minimize isn't consistent, perhaps move to single-click on left-most collapse icon?
@@ -4014,7 +4015,7 @@ static bool ButtonBehaviour(const ImGuiAabb& bb, const ImGuiID& id, bool* out_ho
     if (hovered)
     {
         g.HoveredId = id;
-        if (allow_key_modifiers || (!g.IO.KeyCtrl && !g.IO.KeyShift))
+        if (allow_key_modifiers || (!g.IO.KeyCtrl && !g.IO.KeyShift && !g.IO.KeyAlt))
         {
             if (g.IO.MouseClicked[0])
             {
@@ -8582,6 +8583,7 @@ void ImGui::ShowTestWindow(bool* opened)
     ImGui::Text("ImGui says hello.");
     //ImGui::Text("MousePos (%g, %g)", ImGui::GetIO().MousePos.x, ImGui::GetIO().MousePos.y);
     //ImGui::Text("MouseWheel %d", ImGui::GetIO().MouseWheel);
+    ImGui::Text("KeyMods %s%s%s", ImGui::GetIO().KeyCtrl ? "CTRL" : "", ImGui::GetIO().KeyShift ? "SHIFT" : "", ImGui::GetIO().KeyAlt? "ALT" : "");
     //ImGui::Text("WantCaptureMouse: %d", ImGui::GetIO().WantCaptureMouse);
     //ImGui::Text("WantCaptureKeyboard: %d", ImGui::GetIO().WantCaptureKeyboard);
 

imgui.h

@@ -601,6 +601,7 @@ struct ImGuiIO
     bool        MouseDrawCursor;            // Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor).
     bool        KeyCtrl;                    // Keyboard modifier pressed: Control
     bool        KeyShift;                   // Keyboard modifier pressed: Shift
+    bool        KeyAlt;                     // Keyboard modifier pressed: Alt
     bool        KeysDown[512];              // Keyboard keys that are pressed (in whatever storage order you naturally have access to keyboard data)
     ImWchar     InputCharacters[16+1];      // List of characters input (translated by user from keypress+keyboard state). Fill using AddInputCharacter() helper.