From b430068a23468a8cf92a6d8df1cfd8155a3bfc72 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Axel=20D=C3=B6rfler?= <axeld@pinc-software.de>
Date: Wed, 25 Aug 2004 15:23:28 +0000
Subject: [PATCH] Implemented the enabling/disabling of menu items. "Continue
 boot" will now be disabled if there are no boot volumes. Also, there will be
 an additional menu item "Reboot" in that case. The boot device menu will now
 show a disabled "No boot devices found" label then, and will be selected upon
 entry. Added a help text to "Rescan volumes" which will also be selected upon
 entry if there is no boot device.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8649 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/kernel/boot/loader/menu.cpp | 57 +++++++++++++++++++++++++++------
 1 file changed, 48 insertions(+), 9 deletions(-)

diff --git a/src/kernel/boot/loader/menu.cpp b/src/kernel/boot/loader/menu.cpp
index 9d6ecb1413..c0175fc05b 100644
--- a/src/kernel/boot/loader/menu.cpp
+++ b/src/kernel/boot/loader/menu.cpp
@@ -26,6 +26,7 @@ MenuItem::MenuItem(const char *label, Menu *subMenu)
 	fTarget(NULL),
 	fIsMarked(false),
 	fIsSelected(false),
+	fIsEnabled(true),
 	fType(MENU_ITEM_STANDARD),
 	fMenu(NULL),
 	fSubMenu(subMenu),
@@ -68,18 +69,12 @@ MenuItem::SetMarked(bool marked)
 }
 
 
-void
-MenuItem::Select(bool selected)
-{
-	if (fIsSelected == selected)
-		return;
+void MenuItem::Select(bool selected) { if (fIsSelected == selected) return;
 
 	if (selected && fMenu != NULL) {
 		// unselect previous item
-		MenuItem *selectedItem = fMenu->FindSelected();
-		if (selectedItem != NULL)
-			selectedItem->Select(false);
-	}
+		MenuItem *selectedItem = fMenu->FindSelected(); if (selectedItem !=
+				NULL) selectedItem->Select(false); }
 
 	fIsSelected = selected;
 
@@ -95,6 +90,19 @@ MenuItem::SetType(menu_item_type type)
 }
 
 
+void
+MenuItem::SetEnabled(bool enabled)
+{
+	if (fIsEnabled == enabled)
+		return;
+
+	fIsEnabled = enabled;
+
+	if (fMenu != NULL)
+		fMenu->Draw(this);
+}
+
+
 void
 MenuItem::SetData(void *data)
 {
@@ -302,6 +310,7 @@ add_boot_volume_menu(Directory *bootVolume)
 	Menu *menu = new Menu(CHOICE_MENU, "Select Boot Volume");
 	MenuItem *item;
 	void *cookie;
+	int32 count = 0;
 
 	if (gRoot->Open(&cookie, O_RDONLY) == B_OK) {
 		Directory *volume;
@@ -317,14 +326,27 @@ add_boot_volume_menu(Directory *bootVolume)
 					item->SetMarked(true);
 					item->Select(true);
 				}
+
+				count++;
 			}
 		}
 		gRoot->Close(cookie);
 	}
 
+	if (count == 0) {
+		// no boot volume found yet
+		menu->AddItem(item = new MenuItem("<No boot volume found>"));
+		item->SetType(MENU_ITEM_NO_CHOICE);
+		item->SetEnabled(false);
+	}
+
 	menu->AddSeparatorItem();
+
 	menu->AddItem(item = new MenuItem("Rescan volumes"));
+	item->SetHelpText("Please insert a Haiku CD-ROM or attach a USB disk - depending on your BIOS, you can then boot from them.");
 	item->SetType(MENU_ITEM_NO_CHOICE);
+	item->Select(true);
+
 	menu->AddItem(item = new MenuItem("Return to main menu"));
 	item->SetType(MENU_ITEM_NO_CHOICE);
 
@@ -350,6 +372,14 @@ add_safe_mode_menu()
 }
 
 
+static bool
+user_menu_reboot(Menu *menu, MenuItem *item)
+{
+	platform_exit();
+	return true;
+}
+
+
 status_t
 user_menu(Directory **_bootVolume)
 {
@@ -366,7 +396,16 @@ user_menu(Directory **_bootVolume)
 	platform_add_menus(menu);
 
 	menu->AddSeparatorItem();
+	if (*_bootVolume == NULL) {
+		menu->AddItem(item = new MenuItem("Reboot"));
+		item->SetTarget(user_menu_reboot);
+	}
+
 	menu->AddItem(item = new MenuItem("Continue booting"));
+	if (*_bootVolume == NULL) {
+		item->SetEnabled(false);
+		menu->ItemAt(0)->Select(true);
+	}
 
 	menu->Run();
 	return B_OK;