Imgui Linux impl: implemented xcb event handling

1 files changed, 298 insertions, 0 deletions

diff --git a/Imgui/src/ImGuiImplLinuxXCB.cpp b/Imgui/src/ImGuiImplLinuxXCB.cpp
new file mode 100644
index 0000000..8d3a0dc
--- /dev/null
+++ b/Imgui/src/ImGuiImplLinuxXCB.cpp
@@ -0,0 +1,298 @@
+/*     Copyright 2019 Diligent Graphics LLC
+ *  
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
+ *
+ *  In no event and under no legal theory, whether in tort (including negligence), 
+ *  contract, or otherwise, unless required by applicable law (such as deliberate 
+ *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
+ *  liable for any damages, including any direct, indirect, special, incidental, 
+ *  or consequential damages of any character arising as a result of this License or 
+ *  out of the use or inability to use the software (including but not limited to damages 
+ *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
+ *  all other commercial damages or losses), even if such Contributor has been advised 
+ *  of the possibility of such damages.
+ */
+
+#include "imgui.h"
+
+#include <xcb/xcb.h>
+#include <X11/keysym.h>
+#include "xcb_keysyms/xcb_keysyms.h"
+
+#ifdef Bool
+#   undef Bool
+#endif
+
+#ifdef True
+#   undef True
+#endif
+
+#ifdef False
+#   undef False
+#endif
+
+#include "ImGuiImplLinuxXCB.h"
+
+namespace Diligent
+{
+
+ImGuiImplLinuxXCB::ImGuiImplLinuxXCB(xcb_connection_t* connection,
+                                     IRenderDevice*    pDevice,
+                                     TEXTURE_FORMAT    BackBufferFmt,
+                                     TEXTURE_FORMAT    DepthBufferFmt,
+                                     Uint32            DisplayWidth,
+                                     Uint32            DisplayHeight,
+                                     Uint32            InitialVertexBufferSize,
+                                     Uint32            InitialIndexBufferSize) :
+     ImGuiImplDiligent(pDevice, BackBufferFmt, DepthBufferFmt, InitialVertexBufferSize, InitialIndexBufferSize)
+{
+    m_syms = xcb_key_symbols_alloc((xcb_connection_t*)connection);
+
+    auto& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2(DisplayWidth, DisplayHeight);
+    
+    io.BackendPlatformName = "Diligent-ImGuiImplLinuxXCB";
+
+    // Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array that we will update during the application lifetime.
+    io.KeyMap[ImGuiKey_Tab]         = 0x17;
+    io.KeyMap[ImGuiKey_LeftArrow]   = 0x71;
+    io.KeyMap[ImGuiKey_RightArrow]  = 0x72;
+    io.KeyMap[ImGuiKey_UpArrow]     = 0x6F;
+    io.KeyMap[ImGuiKey_DownArrow]   = 0x74;
+    io.KeyMap[ImGuiKey_PageUp]      = 0x70;
+    io.KeyMap[ImGuiKey_PageDown]    = 0x75;
+    io.KeyMap[ImGuiKey_Home]        = 0x6E;
+    io.KeyMap[ImGuiKey_End]         = 0x73;
+    io.KeyMap[ImGuiKey_Insert]      = 0x76;
+    io.KeyMap[ImGuiKey_Delete]      = 0x77;
+    io.KeyMap[ImGuiKey_Backspace]   = 0x16;
+    //io.KeyMap[ImGuiKey_Space] = 0;//VK_SPACE;
+    io.KeyMap[ImGuiKey_Enter]       = 0x24;
+    io.KeyMap[ImGuiKey_Escape]      = 0x09;
+    io.KeyMap[ImGuiKey_KeyPadEnter] = 0x68;
+    io.KeyMap[ImGuiKey_A] = 'A';
+    io.KeyMap[ImGuiKey_C] = 'C';
+    io.KeyMap[ImGuiKey_V] = 'V';
+    io.KeyMap[ImGuiKey_X] = 'X';
+    io.KeyMap[ImGuiKey_Y] = 'Y';
+    io.KeyMap[ImGuiKey_Z] = 'Z';
+}
+
+ImGuiImplLinuxXCB::~ImGuiImplLinuxXCB()
+{
+    if (m_syms)
+    {
+        xcb_key_symbols_free(m_syms);
+    }
+}
+
+void ImGuiImplLinuxXCB::NewFrame()
+{
+    //ImGui_ImplWin32_NewFrame();
+    ImGuiImplDiligent::NewFrame();
+}
+
+// ----------------------------------------------------------------------
+// ----------------------------------------------------------------------
+void ImGuiImplLinuxXCB::HandleKeyEvent(xcb_key_release_event_t* event)
+{
+    bool IsKeyPressed = (event->response_type & 0x7f) == XCB_KEY_PRESS;
+
+    auto& io = ImGui::GetIO();
+
+    io.KeyCtrl  = event->state & XCB_KEY_BUT_MASK_CONTROL;
+    io.KeyShift = event->state & XCB_KEY_BUT_MASK_SHIFT;
+    io.KeyAlt   = event->state & XCB_KEY_BUT_MASK_MOD_1;
+
+     int k = 0;
+     switch (event->detail)
+     {
+        case 0x09:  k = io.KeyMap[ImGuiKey_Escape];     break;
+        case 0x6F:  k = io.KeyMap[ImGuiKey_UpArrow];    break;
+        case 0x74:  k = io.KeyMap[ImGuiKey_DownArrow];  break;
+        case 0x72:  k = io.KeyMap[ImGuiKey_RightArrow]; break;
+        case 0x71:  k = io.KeyMap[ImGuiKey_LeftArrow];  break;
+        case 0x24:  k = io.KeyMap[ImGuiKey_Enter];      break;
+        case 0x76:  k = io.KeyMap[ImGuiKey_Insert];     break;
+        case 0x77:  k = io.KeyMap[ImGuiKey_Delete];     break;
+        case 0x16:  k = io.KeyMap[ImGuiKey_Backspace];  break;
+        case 0x6E:  k = io.KeyMap[ImGuiKey_Home];       break;
+        case 0x17:  k = io.KeyMap[ImGuiKey_Tab];        break;
+        case 0x73:  k = io.KeyMap[ImGuiKey_End];        break;
+        case 0x68:  k = io.KeyMap[ImGuiKey_KeyPadEnter];break;
+        case 0x70:  k = io.KeyMap[ImGuiKey_PageUp];     break;
+        case 0x75:  k = io.KeyMap[ImGuiKey_PageDown];   break;
+    }      
+
+    if(k == 0 && IsKeyPressed)
+    {
+        xcb_keysym_t keysym = xcb_key_press_lookup_keysym(m_syms, event, 0);
+        switch (keysym)
+        {
+#if 0
+            case XK_Control_L:
+            case XK_Control_R: /*s_KMod |= TW_KMOD_CTRL;*/  break;
+
+            case XK_Shift_L:
+            case XK_Shift_R:   /*s_KMod |= TW_KMOD_SHIFT;*/ break;
+
+            case XK_Alt_L:
+            case XK_Alt_R:     /*s_KMod |= TW_KMOD_ALT;*/   break;
+
+#ifdef XK_Enter
+            case XK_Enter:     k = TW_KEY_RETURN;    break;
+#endif
+
+#ifdef XK_KP_Home
+            case XK_KP_Home:   k = io.KeyMap[ImGuiKey_Home];      break;
+            case XK_KP_End:    k = io.KeyMap[ImGuiKey_End];       break;
+            case XK_KP_Delete: k = io.KeyMap[ImGuiKey_Delete];    break;
+#endif
+
+#ifdef XK_KP_Up
+            case XK_KP_Up:     k = io.KeyMap[ImGuiKey_UpArrow];    break;
+            case XK_KP_Down:   k = io.KeyMap[ImGuiKey_DownArrow];  break;
+            case XK_KP_Right:  k = io.KeyMap[ImGuiKey_RightArrow]; break;
+            case XK_KP_Left:   k = io.KeyMap[ImGuiKey_LeftArrow];  break;
+#endif
+
+#ifdef XK_KP_Page_Up
+            case XK_KP_Page_Up:   k = io.KeyMap[ImGuiKey_PageUp];    break;
+            case XK_KP_Page_Down: k = io.KeyMap[ImGuiKey_PageDown];  break;
+#endif
+
+#ifdef XK_KP_Tab
+            case XK_KP_Tab:    k = io.KeyMap[ImGuiKey_Tab];       break;
+#endif
+#endif
+            default:
+                if (keysym > 12 && keysym < 127)
+                {
+                    if (io.KeyShift)
+                    {
+                        if (keysym >= 'a' && keysym <= 'z')
+                            keysym += (int)'A' - (int)'a';
+                        else
+                        {
+                            switch(keysym)
+                            {
+                                case '`':  keysym = '~'; break;
+                                case '1':  keysym = '!'; break;
+                                case '2':  keysym = '@'; break;
+                                case '3':  keysym = '#'; break;
+                                case '4':  keysym = '$'; break;
+                                case '5':  keysym = '%'; break;
+                                case '6':  keysym = '^'; break;
+                                case '7':  keysym = '&'; break;
+                                case '8':  keysym = '*'; break;
+                                case '9':  keysym = '('; break;
+                                case '0':  keysym = ')'; break;
+                                case '-':  keysym = '_'; break;
+                                case '=':  keysym = '+'; break;
+                                case '[':  keysym = '{'; break;
+                                case ']':  keysym = '}'; break;
+                                case '\\': keysym = '|'; break;
+                                case ';':  keysym = ':'; break;
+                                case '\'': keysym = '\"'; break;
+                                case ',':  keysym = '<'; break;
+                                case '.':  keysym = '>'; break;
+                                case '/':  keysym = '?'; break;
+                            }
+                        }
+                    }
+                    
+                    io.AddInputCharacter(keysym);
+                }
+        }  
+    }
+
+    if (k != 0)
+    {
+        io.KeysDown[k] = IsKeyPressed;
+    }
+}
+
+bool ImGuiImplLinuxXCB::HandleXCBEvent(xcb_generic_event_t* event)
+{
+    auto& io = ImGui::GetIO();
+    switch (event->response_type & 0x7f)
+    {
+        case XCB_MOTION_NOTIFY:
+        {
+            xcb_motion_notify_event_t *motion = (xcb_motion_notify_event_t *)event;
+            io.MousePos = ImVec2(motion->event_x, motion->event_y);
+            return io.WantCaptureMouse;
+        }
+        break;
+
+        case XCB_BUTTON_PRESS:
+        {
+            xcb_button_press_event_t *press = (xcb_button_press_event_t *)event;
+            int button = -1;
+            if (press->detail == XCB_BUTTON_INDEX_1)
+                button = 0; // Left
+            if (press->detail == XCB_BUTTON_INDEX_2)
+                button = 2; // middle
+            if (press->detail == XCB_BUTTON_INDEX_3)
+                button = 1; // right
+            if (button >= 0)
+            {
+                io.MouseDown[button] = true;
+                return io.WantCaptureMouse;
+            }
+            return false;
+        }
+        break;
+
+        case XCB_BUTTON_RELEASE:
+        {
+            xcb_button_release_event_t *press = (xcb_button_release_event_t *)event;
+            int button = -1;
+            if (press->detail == XCB_BUTTON_INDEX_1)
+                button = 0; // Left
+            if (press->detail == XCB_BUTTON_INDEX_2)
+                button = 2; // middle
+            if (press->detail == XCB_BUTTON_INDEX_3)
+                button = 1; // right
+            if (button >= 0)
+            {
+                io.MouseDown[button] = false;
+                return io.WantCaptureKeyboard;
+            }
+            return false;
+        }
+        break;
+
+        case XCB_KEY_RELEASE:
+        case XCB_KEY_PRESS:
+        {
+            xcb_key_press_event_t* keyEvent = (xcb_key_press_event_t *)event;
+            HandleKeyEvent(keyEvent);
+            return io.WantCaptureKeyboard;
+        }
+        break;
+
+        case XCB_CONFIGURE_NOTIFY:
+        {
+            const xcb_configure_notify_event_t *cfgEvent = (const xcb_configure_notify_event_t *)event;
+            io.DisplaySize = ImVec2(cfgEvent->width, cfgEvent->height);
+            return false;
+        }
+        break;
+
+        default:
+            break;
+    }
+
+    return false;
+}
+
+}