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[settings] Enable jump scroll in config UI

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Implement jump scrolling with "..." displayed where the settings list
continues off-screen, because there are now too many settings to fit
on screen in the "config ..." text user interface.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Glenn Brown 2010-06-23 13:18:34 -07:00 committed by Michael Brown
parent 9908587ca2
commit f9bcb928f5
1 changed files with 77 additions and 38 deletions
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115
src/hci/tui/settings_ui.c
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@ -45,6 +45,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define TITLE_ROW 1
#define SETTINGS_LIST_ROW 3
#define SETTINGS_LIST_COL 1
#define SETTINGS_LIST_ROWS 16
#define INFO_ROW 20
#define ALERT_ROW 20
#define INSTRUCTION_ROW 22
@ -65,6 +66,8 @@ struct setting_row {
struct setting_widget {
/** Settings block */
struct settings *settings;
/** Index of the first visible setting, for scrolling. */
unsigned int first_visible;
/** Configuration setting */
struct setting *setting;
/** Screen row */
@ -84,15 +87,13 @@ struct setting_widget {
static void load_setting ( struct setting_widget *widget ) __nonnull;
static int save_setting ( struct setting_widget *widget ) __nonnull;
static void init_setting ( struct setting_widget *widget,
struct settings *settings,
struct setting *setting,
unsigned int row, unsigned int col ) __nonnull;
static void init_widget ( struct setting_widget *widget,
struct settings *settings ) __nonnull;
static void draw_setting ( struct setting_widget *widget ) __nonnull;
static int edit_setting ( struct setting_widget *widget, int key ) __nonnull;
static void init_setting_index ( struct setting_widget *widget,
struct settings *settings,
unsigned int index ) __nonnull;
static void select_setting ( struct setting_widget *widget,
unsigned int index ) __nonnull;
static void reveal ( struct setting_widget *widget, unsigned int n) __nonnull;
static void vmsg ( unsigned int row, const char *fmt, va_list args ) __nonnull;
static void msg ( unsigned int row, const char *fmt, ... ) __nonnull;
static void valert ( const char *fmt, va_list args ) __nonnull;
@ -135,28 +136,17 @@ static int save_setting ( struct setting_widget *widget ) {
}
/**
* Initialise setting widget
* Initialise the scrolling setting widget, drawing initial display.
*
* @v widget Setting widget
* @v settings Settings block
* @v setting Configuration setting
* @v row Screen row
* @v col Screen column
*/
static void init_setting ( struct setting_widget *widget,
struct settings *settings,
struct setting *setting,
unsigned int row, unsigned int col ) {
/* Initialise widget structure */
static void init_widget ( struct setting_widget *widget,
struct settings *settings ) {
memset ( widget, 0, sizeof ( *widget ) );
widget->settings = settings;
widget->setting = setting;
widget->row = row;
widget->col = col;
/* Read current setting value */
load_setting ( widget );
widget->first_visible = SETTINGS_LIST_ROWS;
reveal ( widget, 0 );
}
/**
@ -212,19 +202,25 @@ static int edit_setting ( struct setting_widget *widget, int key ) {
}
/**
* Initialise setting widget by index
* Select a setting for display updates, by index.
*
* @v widget Setting widget
* @v settings Settings block
* @v index Index of setting with settings list
*/
static void init_setting_index ( struct setting_widget *widget,
struct settings *settings,
unsigned int index ) {
static void select_setting ( struct setting_widget *widget,
unsigned int index ) {
struct setting *all_settings = table_start ( SETTINGS );
unsigned int skip = offsetof ( struct setting_widget, setting );
init_setting ( widget, settings, &all_settings[index],
( SETTINGS_LIST_ROW + index ), SETTINGS_LIST_COL );
/* Reset the widget, preserving static state. */
memset ( ( char * ) widget + skip, 0, sizeof ( *widget ) - skip );
widget->setting = &all_settings[index];
widget->row = SETTINGS_LIST_ROW + index - widget->first_visible;
widget->col = SETTINGS_LIST_COL;
/* Read current setting value */
load_setting ( widget );
}
/**
@ -334,22 +330,65 @@ static void draw_instruction_row ( int editing ) {
}
}
/**
* Reveal a setting by index: Scroll the setting list to reveal the
* specified setting.
*
* @widget The main loop's display widget.
* @n The index of the setting to reveal.
*/
static void reveal ( struct setting_widget *widget, unsigned int n)
{
unsigned int i;
/* Simply return if setting N is already on-screen. */
if ( n - widget->first_visible < SETTINGS_LIST_ROWS )
return;
/* Jump scroll to make the specified setting visible. */
while ( widget->first_visible < n )
widget->first_visible += SETTINGS_LIST_ROWS;
while ( widget->first_visible > n )
widget->first_visible -= SETTINGS_LIST_ROWS;
/* Draw elipses before and/or after the settings list to
represent any invisible settings. */
mvaddstr ( SETTINGS_LIST_ROW - 1,
SETTINGS_LIST_COL + 1,
widget->first_visible > 0 ? "..." : " " );
mvaddstr ( SETTINGS_LIST_ROW + SETTINGS_LIST_ROWS,
SETTINGS_LIST_COL + 1,
( widget->first_visible + SETTINGS_LIST_ROWS < NUM_SETTINGS
? "..."
: " " ) );
/* Draw visible settings. */
for ( i = 0; i < SETTINGS_LIST_ROWS; i++ ) {
if ( widget->first_visible + i < NUM_SETTINGS ) {
select_setting ( widget, widget->first_visible + i );
draw_setting ( widget );
} else {
clearmsg ( SETTINGS_LIST_ROW + i );
}
}
/* Set the widget to the current row, which will be redrawn
appropriately by the main loop. */
select_setting ( widget, n );
}
static int main_loop ( struct settings *settings ) {
struct setting_widget widget;
unsigned int current = 0;
unsigned int next;
int i;
int key;
int rc;
/* Print initial screen content */
draw_title_row();
color_set ( CPAIR_NORMAL, NULL );
for ( i = ( NUM_SETTINGS - 1 ) ; i >= 0 ; i-- ) {
init_setting_index ( &widget, settings, i );
draw_setting ( &widget );
}
init_widget ( &widget, settings );
while ( 1 ) {
/* Redraw information and instruction rows */
draw_info_row ( widget.setting );
@ -385,11 +424,11 @@ static int main_loop ( struct settings *settings ) {
switch ( key ) {
case KEY_DOWN:
if ( next < ( NUM_SETTINGS - 1 ) )
next++;
reveal ( &widget, ++next );
break;
case KEY_UP:
if ( next > 0 )
next--;
reveal ( &widget, --next ) ;
break;
case CTRL_X:
return 0;
@ -399,7 +438,7 @@ static int main_loop ( struct settings *settings ) {
}
if ( next != current ) {
draw_setting ( &widget );
init_setting_index ( &widget, settings, next );
select_setting ( &widget, next );
current = next;
}
}