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Now shows the help text of a menu item while it's selected (up to two lines of

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text, automatically wrapped correctly).
Added print_centered() function.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8119 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2004-06-22 02:55:51 +00:00
parent 447564cfea
commit a7aea4b86d
1 changed files with 81 additions and 11 deletions
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92
src/kernel/boot/platform/bios_ia32/menu.cpp
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@ -33,7 +33,7 @@ static int32 sMenuOffset = 0;
static int32
menu_height()
{
return console_height() - kFirstLine - kHelpLines;
return console_height() - kFirstLine - 1 - kHelpLines;
}
@ -46,7 +46,18 @@ print_spacing(int32 count)
static void
print_item_at(int32 line, MenuItem *item)
print_centered(int32 line, const char *text)
{
console_set_cursor(console_width() / 2 - strlen(text) / 2, line);
printf("%s", text);
console_set_cursor(0, 0);
// this avoids unwanted line feeds
}
static void
print_item_at(int32 line, MenuItem *item, bool clearHelp = true)
{
bool selected = item->IsSelected();
@ -105,6 +116,70 @@ print_item_at(int32 line, MenuItem *item)
}
print_spacing(console_width() - length - 2*kOffsetX);
if (!selected)
return;
console_set_cursor(0, console_height() - kHelpLines);
console_set_color(WHITE, BLACK);
if (clearHelp) {
// clear help text area
for (int32 i = 0; i < console_width() * 2 - 1; i++)
putchar(' ');
console_set_cursor(0, console_height() - kHelpLines);
}
if (item->HelpText() != NULL) {
// show help text at the bottom of the screen,
// center it, and wrap it correctly
const char *text = item->HelpText();
int32 width = console_width() - 2 * kOffsetX;
int32 length = strlen(text);
if (length > width * 2)
width += 2 * kOffsetX - 1;
char buffer[width + 1];
buffer[width] = '\0';
// make sure the buffer is always terminated
int32 row = 0;
for (int32 i = 0; i < length && row < 2; i++) {
while (text[i] == ' ')
i++;
// copy as much bytes as possible
int32 bytes = width;
if (bytes > length - i)
bytes = length - i;
memcpy(buffer, text + i, bytes);
buffer[bytes] = '\0';
char *pos = strchr(buffer, '\n');
if (pos != NULL)
i = pos - buffer;
else if (bytes < length - i) {
// search for possible line breaks
pos = strrchr(buffer, ' ');
if (pos != NULL)
i = pos - buffer;
else {
// no wrapping possible
i += bytes;
}
} else
i += bytes;
buffer[i] = '\0';
print_centered(console_height() - kHelpLines + row, buffer);
row++;
}
}
}
@ -113,17 +188,14 @@ draw_menu(Menu *menu)
{
console_clear_screen();
console_set_cursor(console_width()/2 - 7, 1);
console_set_color(WHITE, BLACK);
printf("Welcome To The");
print_centered(1, "Welcome To The");
console_set_cursor(console_width()/2 - 8, 2);
console_set_color(WHITE, BLACK);
printf("Haiku Boot Loader");
print_centered(2, "Haiku Boot Loader");
console_set_cursor(console_width()/2 - 12, 4);
console_set_color(GREEN, BLACK);
printf("Copyright 2004 Haiku Inc.");
print_centered(4, "Copyright 2004 Haiku Inc.");
if (menu->Title()) {
console_set_cursor(kOffsetX, kFirstLine - 2);
@ -137,8 +209,6 @@ draw_menu(Menu *menu)
MenuItem *item;
int32 i = 0;
console_set_cursor(kOffsetX, kFirstLine);
while ((item = iterator.Next()) != NULL) {
if (item->Type() == MENU_ITEM_SEPARATOR) {
putchar('\n');
@ -146,7 +216,7 @@ draw_menu(Menu *menu)
continue;
}
print_item_at(i++, item);
print_item_at(i++, item, false);
}
int32 height = menu_height();