Add MU_OPT_NODRAG

Derived from GitHub PR rxi/microui#50

demo.c

@@ -176,7 +176,7 @@ test_window(mu_Context* ctx)
 static void
 log_window(mu_Context* ctx)
 {
-    if (mu_begin_window(ctx, "Log Window", mu_rect(350, 40, 300, 200))) {
+    if (mu_begin_window_ex(ctx, "Log Window", mu_rect(350, 40, 300, 200), MU_OPT_NODRAG)) {
         /* output text panel */
         mu_layout_row(ctx, 1, (int[]) { -1 }, -25);
         mu_begin_panel(ctx, "Log Output");

demo.sunder

@@ -168,7 +168,7 @@ func test_window(ui: *smol::ui) void {
 var textbox_buffer = (:[128]char)[0...];
 func log_window(ui: *smol::ui) void
 {
-    if ui.*.begin_window("Log Window", smol::rect::init(350, 40, 300, 200)) {
+    if ui.*.begin_window_ex("Log Window", smol::rect::init(350, 40, 300, 200), smol::OPT_NODRAG) {
         # output text panel
         ui.*.layout_row((:[]sint)[-1], -25);
         ui.*.begin_panel("Log Output");

microui.c

@@ -1220,7 +1220,7 @@ mu_begin_window_ex(mu_Context* ctx, char const* title, mu_Rect rect, int opt)
             mu_Id id = mu_get_id(ctx, "!title", 6);
             mu_update_control(ctx, id, tr, opt);
             mu_draw_control_text(ctx, title, tr, MU_COLOR_TITLETEXT, opt);
-            if (id == ctx->focus && ctx->mouse_down == MU_MOUSE_LEFT) {
+            if (id == ctx->focus && ctx->mouse_down == MU_MOUSE_LEFT &&  ~opt & MU_OPT_NODRAG) {
                 cnt->rect.x += ctx->mouse_delta.x;
                 cnt->rect.y += ctx->mouse_delta.y;
             }

microui.h

@@ -85,11 +85,12 @@ enum {
     MU_OPT_NOSCROLL     = (1 << 5),
     MU_OPT_NOCLOSE      = (1 << 6),
     MU_OPT_NOTITLE      = (1 << 7),
-    MU_OPT_HOLDFOCUS    = (1 << 8),
-    MU_OPT_AUTOSIZE     = (1 << 9),
-    MU_OPT_POPUP        = (1 << 10),
-    MU_OPT_CLOSED       = (1 << 11),
-    MU_OPT_EXPANDED     = (1 << 12)
+    MU_OPT_NODRAG       = (1 << 8),
+    MU_OPT_HOLDFOCUS    = (1 << 9),
+    MU_OPT_AUTOSIZE     = (1 << 10),
+    MU_OPT_POPUP        = (1 << 11),
+    MU_OPT_CLOSED       = (1 << 12),
+    MU_OPT_EXPANDED     = (1 << 13)
 };
 
 enum {

microui.sunder

@@ -58,11 +58,12 @@ let MU_OPT_NORESIZE    = (:sint)(1u << 4);
 let MU_OPT_NOSCROLL    = (:sint)(1u << 5);
 let MU_OPT_NOCLOSE     = (:sint)(1u << 6);
 let MU_OPT_NOTITLE     = (:sint)(1u << 7);
-let MU_OPT_HOLDFOCUS   = (:sint)(1u << 8);
-let MU_OPT_AUTOSIZE    = (:sint)(1u << 9);
-let MU_OPT_POPUP       = (:sint)(1u << 10);
-let MU_OPT_CLOSED      = (:sint)(1u << 11);
-let MU_OPT_EXPANDED    = (:sint)(1u << 12);
+let MU_OPT_NODRAG      = (:sint)(1u << 8);
+let MU_OPT_HOLDFOCUS   = (:sint)(1u << 9);
+let MU_OPT_AUTOSIZE    = (:sint)(1u << 10);
+let MU_OPT_POPUP       = (:sint)(1u << 11);
+let MU_OPT_CLOSED      = (:sint)(1u << 12);
+let MU_OPT_EXPANDED    = (:sint)(1u << 13);
 
 let MU_MOUSE_LEFT      = (:sint)(1u << 0);
 let MU_MOUSE_RIGHT     = (:sint)(1u << 1);

smolui.sunder

@@ -39,6 +39,7 @@ let OPT_NORESIZE    = MU_OPT_NORESIZE;
 let OPT_NOSCROLL    = MU_OPT_NOSCROLL;
 let OPT_NOCLOSE     = MU_OPT_NOCLOSE;
 let OPT_NOTITLE     = MU_OPT_NOTITLE;
+let OPT_NODRAG      = MU_OPT_NODRAG;
 let OPT_HOLDFOCUS   = MU_OPT_HOLDFOCUS;
 let OPT_AUTOSIZE    = MU_OPT_AUTOSIZE;
 let OPT_POPUP       = MU_OPT_POPUP;