From d78d12fdfe09eb6d1b08baf6725cd5aed9b4ea07 Mon Sep 17 00:00:00 2001
From: Darkvater <Darkvater@openttd.org>
Date: Fri, 29 Dec 2006 17:16:12 +0000
Subject: (svn r7619) -Feature (Internal): Add support for modal children. It's
 a window-child that  will block activity for the parent window until the
 modal popup is dismissed.

---
 window.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

(limited to 'window.c')

diff --git a/window.c b/window.c
index 14aef6bb7..75da457b5 100644
--- a/window.c
+++ b/window.c
@@ -1405,8 +1405,17 @@ static bool HandleViewportScroll(void)
 	return false;
 }
 
-static void MaybeBringWindowToFront(const Window *w)
-{
+/** Check if a window can be made top-most window, and if so do
+ * it. If a window does not obscure any other windows, it will not
+ * be brought to the foreground. Also if the only obscuring windows
+ * are so-called system-windows, the window will not be moved.
+ * The function will return false when a child window of this window is a
+ * modal-popup; function returns a false and child window gets a white border
+ * @param w Window to bring on-top
+ * @return false if the window has an active modal child, true otherwise */
+static bool MaybeBringWindowToFront(const Window *w)
+{
+	bool bring_to_front = false;
 	Window* const *wz;
 	Window* const *uz;
 
@@ -1414,12 +1423,19 @@ static void MaybeBringWindowToFront(const Window *w)
 			IsVitalWindow(w) ||
 			w->window_class == WC_TOOLTIPS ||
 			w->window_class == WC_DROPDOWN_MENU) {
-		return;
+		return true;
 	}
 
 	wz = FindWindowZPosition(w);
 	for (uz = wz; ++uz != _last_z_window;) {
-		const Window *u = *uz;
+		Window *u = *uz;
+
+		/* A modal child will prevent the activation of the parent window */
+		if (u->parent == w && (u->desc_flags & WDF_MODAL)) {
+			u->flags4 |= WF_WHITE_BORDER_MASK;
+			SetWindowDirty(u);
+			return false;
+		}
 
 		if (u->window_class == WC_MAIN_WINDOW ||
 				IsVitalWindow(u) ||
@@ -1428,6 +1444,7 @@ static void MaybeBringWindowToFront(const Window *w)
 			continue;
 		}
 
+		/* Window sizes don't interfere, leave z-order alone */
 		if (w->left + w->width <= u->left ||
 				u->left + u->width <= w->left ||
 				w->top  + w->height <= u->top ||
@@ -1435,9 +1452,11 @@ static void MaybeBringWindowToFront(const Window *w)
 			continue;
 		}
 
-		BringWindowToFront(w);
-		return;
+		bring_to_front = true;
 	}
+
+	if (bring_to_front) BringWindowToFront(w);
+	return true;
 }
 
 /** Send a message from one window to another. The receiving window is found by
@@ -1616,7 +1635,7 @@ void MouseLoop(int click, int mousewheel)
 
 	w = FindWindowFromPt(x, y);
 	if (w == NULL) return;
-	MaybeBringWindowToFront(w);
+	if (!MaybeBringWindowToFront(w)) return;
 	vp = IsPtInWindowViewport(w, x, y);
 
 	/* Don't allow any action in a viewport if either in menu of in generating world */
-- 
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