マウスオーバー効果

control.c

@@ -54,7 +54,7 @@ OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 char curinput[64] = {0};
 int input_pos = 0;
 int initialized = 0;
-SuwaButton buttons[NUM_ROWS][NUM_COLS];
+SuwaButton *lasthover = NULL;
 
 static const char *btn_labels[][10] = {
   { NULL }, // 数字表示
@@ -195,7 +195,6 @@ void initialize_basic_buttons(SuwaWindow *window, XftDraw *backdraw, float scale
         }
       }
       suwaui_draw_button(window, &btn, backdraw);
-      buttons[row][col] = btn;
     }
   }
 }
@@ -385,23 +384,14 @@ redraw:
   control_expose(window, labels, &(SuwaButton){0});
 }
 
-void handle_mouse_hover(SuwaWindow *window, CtrlLabels *labels) {
-  int x = window->event.xmotion.x;
-  int y = window->event.xmotion.y;
-  SuwaButton *btn = find_button_at(window, x, y);
+void handle_mouse_hover(SuwaWindow *window, CtrlLabels *labels, int mx, int my) {
+  SuwaButton *btn = find_button_at(window, mx, my);
   if (!btn) return;
 
-  btn->hovered = 1;
-  XftDraw *backdraw = XftDrawCreate(window->display, window->backbuf,
-      DefaultVisual(window->display, DefaultScreen(window->display)),
-        DefaultColormap(window->display, DefaultScreen(window->display)));
-  if (!backdraw) {
-    fprintf(stderr, "Pixmap向けXftDrawの作成に失敗。\n");
-    XFreePixmap(window->display, window->backbuf);
-    window->backbuf = None;
-    return;
-  }
+  if (lasthover && lasthover != btn) lasthover->hovered = 0;
+  if (btn) btn->hovered = 1;
+  lasthover = btn;
 
   window->event = (XEvent){.type = Expose};
-  control_expose(window, labels, btn);
+  control_expose(window, labels, btn ? btn : &(SuwaButton){0});
 }

control.h

@@ -47,4 +47,4 @@ void control_expose(SuwaWindow *window, CtrlLabels *labels, SuwaButton *button);
 void handle_button_press(SuwaWindow *window, CtrlLabels *labels, int mx, int my);
 void handle_button_release(SuwaWindow *window, CtrlLabels *labels, int mx, int my);
 void handle_key_press(SuwaWindow *window, CtrlLabels *labels);
-void handle_mouse_hover(SuwaWindow *window, CtrlLabels *labels);
+void handle_mouse_hover(SuwaWindow *window, CtrlLabels *labels, int mx, int my);

include/suwaui.h

@@ -332,8 +332,8 @@ __attribute__((unused)) static SuwaWindow suwaui_create_window(int x, int y, int
     | ButtonPressMask
     | ButtonReleaseMask
     | KeyPressMask
-    // | PointerMotionMask
-    // | ButtonMotionMask
+    | PointerMotionMask
+    | Button1MotionMask
     // | StructureNotifyMask
   );
 

main.c

@@ -43,6 +43,8 @@ const char *sofname = "ucalc";
 const char *version = "0.0.0";
 const char *disname = "Unix Calc";
 
+static Time lasthovertime = 0;
+
 int main() {
 #if defined(__OpenBSD__)
   SuwaWindow window = suwaui_create_window(
@@ -109,7 +111,18 @@ int main() {
         handle_key_press(&window, &lbl);
         break;
       case MotionNotify:
-        handle_mouse_hover(&window, &lbl);
+        Time now = window.event.xmotion.time;
+        if (now - lasthovertime < 40) break;
+        lasthovertime = now;
+        Window root, child;
+        int root_x, root_y,
+            win_x, win_y;
+        unsigned int mask;
+
+        XQueryPointer(window.display, window.xwindow, &root, &child,
+            &root_x, &root_y, &win_x, &win_y, &mask);
+        if (window.event.xmotion.state == 0) break;
+        handle_mouse_hover(&window, &lbl, win_x, win_y);
         break;
       case ClientMessage:
         // WM_DELETE_WINDOW