Window movement and resizing clamped to prevent moving them entirely offscreen.

dvx/dvxApp.c

@@ -770,7 +770,7 @@ static void dispatchEvents(AppContextT *ctx) {
     // Handle active drag
     if (ctx->stack.dragWindow >= 0) {
         if (buttons & 1) {
-            wmDragMove(&ctx->stack, &ctx->dirty, mx, my);
+            wmDragMove(&ctx->stack, &ctx->dirty, mx, my, ctx->display.width, ctx->display.height);
         } else {
             wmDragEnd(&ctx->stack);
         }
@@ -2782,21 +2782,39 @@ static void pollKeyboard(AppContextT *ctx) {
             }
 
             if (ctx->kbMoveResize.mode == KbModeMoveE) {
+                int32_t oldX = kbWin->x;
+                int32_t oldY = kbWin->y;
+
                 if (ascii == 0 && scancode == 0x48) {
-                    dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                     kbWin->y -= KB_MOVE_STEP;
-                    dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                 } else if (ascii == 0 && scancode == 0x50) {
-                    dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                     kbWin->y += KB_MOVE_STEP;
-                    dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                 } else if (ascii == 0 && scancode == 0x4B) {
-                    dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                     kbWin->x -= KB_MOVE_STEP;
-                    dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                 } else if (ascii == 0 && scancode == 0x4D) {
-                    dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                     kbWin->x += KB_MOVE_STEP;
+                }
+
+                // Clamp: keep title bar reachable
+                int32_t screenW    = ctx->display.width;
+                int32_t screenH    = ctx->display.height;
+                int32_t minVisible = 50;
+
+                if (kbWin->y < 0) {
+                    kbWin->y = 0;
+                }
+                if (kbWin->y + CHROME_BORDER_WIDTH + CHROME_TITLE_HEIGHT > screenH) {
+                    kbWin->y = screenH - CHROME_BORDER_WIDTH - CHROME_TITLE_HEIGHT;
+                }
+                if (kbWin->x + kbWin->w < minVisible) {
+                    kbWin->x = minVisible - kbWin->w;
+                }
+                if (kbWin->x > screenW - minVisible) {
+                    kbWin->x = screenW - minVisible;
+                }
+
+                if (kbWin->x != oldX || kbWin->y != oldY) {
+                    dirtyListAdd(&ctx->dirty, oldX, oldY, kbWin->w, kbWin->h);
                     dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                 }
             } else {
@@ -2830,6 +2848,18 @@ static void pollKeyboard(AppContextT *ctx) {
                     newH = kbWin->maxH;
                 }
 
+                // Clamp to screen boundaries
+                int32_t screenW = ctx->display.width;
+                int32_t screenH = ctx->display.height;
+
+                if (kbWin->x + newW > screenW) {
+                    newW = screenW - kbWin->x;
+                }
+
+                if (kbWin->y + newH > screenH) {
+                    newH = screenH - kbWin->y;
+                }
+
                 if (newW != kbWin->w || newH != kbWin->h) {
                     dirtyListAdd(&ctx->dirty, kbWin->x, kbWin->y, kbWin->w, kbWin->h);
                     kbWin->w = newW;

dvx/dvxWm.c

@@ -1193,18 +1193,33 @@ void wmDragEnd(WindowStackT *stack) {
 // we don't need to ask the app to repaint during the drag, just blit from
 // its buffer at the new position.
 
-void wmDragMove(WindowStackT *stack, DirtyListT *dl, int32_t mouseX, int32_t mouseY) {
+void wmDragMove(WindowStackT *stack, DirtyListT *dl, int32_t mouseX, int32_t mouseY, int32_t screenW, int32_t screenH) {
     if (stack->dragWindow < 0 || stack->dragWindow >= stack->count) {
         return;
     }
 
     WindowT    *win        = stack->windows[stack->dragWindow];
+    int32_t     minVisible = 50;
 
     dirtyListAdd(dl, win->x, win->y, win->w, win->h);
 
     win->x = mouseX - stack->dragOffX;
     win->y = mouseY - stack->dragOffY;
 
+    // Clamp: keep title bar reachable
+    if (win->y < 0) {
+        win->y = 0;
+    }
+    if (win->y + CHROME_BORDER_WIDTH + CHROME_TITLE_HEIGHT > screenH) {
+        win->y = screenH - CHROME_BORDER_WIDTH - CHROME_TITLE_HEIGHT;
+    }
+    if (win->x + win->w < minVisible) {
+        win->x = minVisible - win->w;
+    }
+    if (win->x > screenW - minVisible) {
+        win->x = screenW - minVisible;
+    }
+
     dirtyListAdd(dl, win->x, win->y, win->w, win->h);
 }
 
@@ -2022,6 +2037,11 @@ void wmResizeMove(WindowStackT *stack, DirtyListT *dl, const DisplayT *d, int32_
             newW  = maxW;
         }
 
+        if (newX < 0) {
+            newW += newX;
+            newX  = 0;
+        }
+
         if (newW >= minW) {
             win->x   = newX;
             win->w   = newW;
@@ -2036,6 +2056,10 @@ void wmResizeMove(WindowStackT *stack, DirtyListT *dl, const DisplayT *d, int32_
             newW = maxW;
         }
 
+        if (win->x + newW > d->width) {
+            newW = d->width - win->x;
+        }
+
         if (newW >= minW) {
             win->w   = newW;
             appliedX = true;
@@ -2051,6 +2075,11 @@ void wmResizeMove(WindowStackT *stack, DirtyListT *dl, const DisplayT *d, int32_
             newH  = maxH;
         }
 
+        if (newY < 0) {
+            newH += newY;
+            newY  = 0;
+        }
+
         if (newH >= minH) {
             win->y   = newY;
             win->h   = newH;
@@ -2065,6 +2094,10 @@ void wmResizeMove(WindowStackT *stack, DirtyListT *dl, const DisplayT *d, int32_
             newH = maxH;
         }
 
+        if (win->y + newH > d->height) {
+            newH = d->height - win->y;
+        }
+
         if (newH >= minH) {
             win->h   = newH;
             appliedY = true;

dvx/dvxWm.h

@@ -131,7 +131,7 @@ int32_t wmResizeEdgeHit(const WindowT *win, int32_t mx, int32_t my);
 // event while dragWindow is active. Dirties both the old and new window
 // positions. The drag offset (mouse position relative to window origin at
 // drag start) is applied so the window tracks the mouse smoothly.
-void wmDragMove(WindowStackT *stack, DirtyListT *dl, int32_t mouseX, int32_t mouseY);
+void wmDragMove(WindowStackT *stack, DirtyListT *dl, int32_t mouseX, int32_t mouseY, int32_t screenW, int32_t screenH);
 
 // Update window dimensions during an active resize. Enforces MIN_WINDOW_W/H
 // and optional maxW/maxH constraints. Reallocates the content buffer if the