x11: Implement setNativeMouseCursor()

src/she/x11/window.cpp

@@ -13,6 +13,7 @@
 #include "gfx/rect.h"
 #include "she/event.h"
 
+#include <X11/cursorfont.h>
 #include <map>
 
 namespace she {
@@ -23,6 +24,9 @@ namespace {
 // window is pressed by the userh.
 Atom wmDeleteMessage = 0;
 
+// Cursor Without pixels to simulate a hidden X11 cursor
+Cursor empty_xcursor = None;
+
 // See https://bugs.freedesktop.org/show_bug.cgi?id=12871 for more
 // information, it looks like the official way to convert a X Window
 // into our own user data pointer (X11Window instance) is using a map.
@@ -102,6 +106,8 @@ void X11Window::removeWindow(X11Window* window)
 
 X11Window::X11Window(::Display* display, int width, int height, int scale)
   : m_display(display)
+  , m_gc(nullptr)
+  , m_cursor(None)
   , m_scale(scale)
 {
   // Initialize special messages (just the first time a X11Window is
@@ -207,7 +213,93 @@ void X11Window::updateWindow(const gfx::Rect& unscaledBounds)
 
 bool X11Window::setNativeMouseCursor(NativeCursor cursor)
 {
-  return false;
+  Cursor xcursor = None;
+
+  switch (cursor) {
+    case kNoCursor: {
+      if (empty_xcursor == None) {
+        char data = 0;
+        Pixmap image = XCreateBitmapFromData(
+          m_display, m_window, (char*)&data, 1, 1);
+
+        XColor color;
+        empty_xcursor = XCreatePixmapCursor(
+          m_display, image, image, &color, &color, 0, 0);
+
+        XFreePixmap(m_display, image);
+      }
+      xcursor = empty_xcursor;
+      break;
+    }
+    case kArrowCursor:
+      xcursor = XCreateFontCursor(m_display, XC_arrow);
+      break;
+    case kCrosshairCursor:
+      xcursor = XCreateFontCursor(m_display, XC_crosshair);
+      break;
+    case kIBeamCursor:
+      xcursor = XCreateFontCursor(m_display, XC_xterm);
+      break;
+    case kWaitCursor:
+      xcursor = XCreateFontCursor(m_display, XC_watch);
+      break;
+    case kLinkCursor:
+      xcursor = XCreateFontCursor(m_display, XC_hand1);
+      break;
+    case kHelpCursor:
+      xcursor = XCreateFontCursor(m_display, XC_question_arrow);
+      break;
+    case kForbiddenCursor:
+      xcursor = XCreateFontCursor(m_display, XC_X_cursor);
+      break;
+    case kMoveCursor:
+      xcursor = XCreateFontCursor(m_display, XC_fleur);
+      break;
+    case kSizeNCursor:
+      xcursor = XCreateFontCursor(m_display, XC_top_side);
+      break;
+    case kSizeNSCursor:
+      xcursor = XCreateFontCursor(m_display, XC_sb_v_double_arrow);
+      break;
+    case kSizeSCursor:
+      xcursor = XCreateFontCursor(m_display, XC_bottom_side);
+      break;
+    case kSizeWCursor:
+      xcursor = XCreateFontCursor(m_display, XC_left_side);
+      break;
+    case kSizeECursor:
+      xcursor = XCreateFontCursor(m_display, XC_right_side);
+      break;
+    case kSizeWECursor:
+      xcursor = XCreateFontCursor(m_display, XC_sb_h_double_arrow);
+      break;
+    case kSizeNWCursor:
+      xcursor = XCreateFontCursor(m_display, XC_top_left_corner);
+      break;
+    case kSizeNECursor:
+      xcursor = XCreateFontCursor(m_display, XC_top_right_corner);
+      break;
+    case kSizeSWCursor:
+      xcursor = XCreateFontCursor(m_display, XC_bottom_left_corner);
+      break;
+    case kSizeSECursor:
+      xcursor = XCreateFontCursor(m_display, XC_bottom_right_corner);
+      break;
+  }
+
+  if (m_cursor != None) {
+    if (m_cursor != empty_xcursor) // Don't delete empty_xcursor
+      XFreeCursor(m_display, m_cursor);
+    m_cursor = None;
+  }
+
+  if (xcursor != None) {
+    m_cursor = xcursor;
+    XDefineCursor(m_display, m_window, xcursor);
+    return true;
+  }
+  else
+    return false;
 }
 
 bool X11Window::setNativeMouseCursor(const she::Surface* surface,

src/she/x11/window.h

@@ -64,6 +64,7 @@ private:
   ::Display* m_display;
   ::Window m_window;
   ::GC m_gc;
+  ::Cursor m_cursor;
   int m_scale;
 };