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/***************************************************************************
gui_scrollbar.c - description
-------------------
begin : Wed Oct 16 2002
copyright : (C) 2002 by Michael Speck
email : kulkanie@gmx.net
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <stdlib.h>
#include "gui_widget.h"
#include "gui_button.h"
#include "gui_scrollbar.h"
extern GuiTheme *gui_theme;
extern SDL_Surface *stk_display;
/*
====================================================================
LOCALS
====================================================================
*/
/*
====================================================================
Default event handler
====================================================================
*/
static void default_event_handler(
GuiWidget *widget, GuiEvent *event )
{
switch ( event->type ) {
case GUI_DESTROY:
break;
case GUI_DRAW:
/* display surface */
stk_surface_blit(
widget->surface, 0, 0, -1, -1,
stk_display,
widget->screen_region.x,
widget->screen_region.y );
break;
case GUI_BUTTON_PRESSED:
if ( widget->spec.scrollbar.vertical ) {
if ( event->button.y <
widget->spec.scrollbar.track->
screen_region.y )
gui_scrollbar_add( widget,
-widget->spec.scrollbar.jump );
else
gui_scrollbar_add( widget,
widget->spec.scrollbar.jump );
}
else {
if ( event->button.x <
widget->spec.scrollbar.track->
screen_region.x )
gui_scrollbar_add( widget,
-widget->spec.scrollbar.jump );
else
gui_scrollbar_add( widget,
widget->spec.scrollbar.jump );
}
break;
}
}
/*
====================================================================
Warp track button of scrollbar to correct position.
====================================================================
*/
static void gui_scrollbar_update_track( GuiWidget *widget )
{
int offset;
if ( widget->type != GUI_SCROLLBAR ) return;
if ( widget->spec.scrollbar.min == widget->spec.scrollbar.max )
offset = 0;
else
offset =
(((widget->spec.scrollbar.vertical) ?
widget->parent_region.h :
widget->parent_region.w) -
(widget->spec.scrollbar.button_size * 3) ) *
widget->spec.scrollbar.value /
(widget->spec.scrollbar.max - widget->spec.scrollbar.min);
gui_widget_warp( widget->spec.scrollbar.track,
(widget->spec.scrollbar.vertical) ? 0 :
(offset + widget->spec.scrollbar.button_size),
(widget->spec.scrollbar.vertical)?
(offset + widget->spec.scrollbar.button_size) : 0 );
}
/*
====================================================================
Update the scrollbar value by position of track button,
return True if it has changed and call event handler with
GUI_CHANGED.
====================================================================
*/
static int gui_scrollbar_adjust( GuiWidget *widget )
{
int new_value;
if ( widget->type != GUI_SCROLLBAR ) return 0;
new_value = (((widget->spec.scrollbar.vertical) ?
widget->spec.scrollbar.track->parent_region.y :
widget->spec.scrollbar.track->parent_region.x) -
widget->spec.scrollbar.button_size) *
(widget->spec.scrollbar.max - widget->spec.scrollbar.min) /
(((widget->spec.scrollbar.vertical) ?
widget->parent_region.h :
widget->parent_region.w) -
widget->spec.scrollbar.button_size * 3);
if ( new_value != widget->spec.scrollbar.value ) {
widget->spec.scrollbar.value = new_value;
gui_widget_call_user_event_handler(
widget, gui_event_get_simple( GUI_CHANGED ) );
return 1;
}
return 0;
}
/*
====================================================================
Default event handlers for scrollbar buttons: update the
scrollbar if a button was clicked and pass the event to the
scrollbar's user event handler.
====================================================================
*/
static void gui_scrollbar_dec_handler(
GuiWidget *widget, GuiEvent *event )
{
if ( event->type == GUI_CLICKED )
gui_scrollbar_add( widget->parent,
-widget->parent->spec.scrollbar.step );
gui_widget_call_user_event_handler(
widget->parent, event );
}
static void gui_scrollbar_inc_handler(
GuiWidget *widget, GuiEvent *event )
{
if ( event->type == GUI_CLICKED )
gui_scrollbar_add( widget->parent,
widget->parent->spec.scrollbar.step );
gui_widget_call_user_event_handler(
widget->parent, event );
}
static void gui_scrollbar_track_handler(
GuiWidget *widget, GuiEvent *event )
{
int pos;
if ( event->type == GUI_MOTION )
if ( event->motion.button ) {
if ( widget->parent->spec.scrollbar.vertical ) {
/* absolute offset in parent */
pos = widget->parent_region.y +
event->motion.yrel;
if ( pos < widget->parent->spec.scrollbar.button_size )
pos = widget->parent->spec.scrollbar.button_size;
else
if ( pos >= widget->parent->parent_region.h -
(widget->parent->spec.scrollbar.button_size<<1) )
pos = widget->parent->parent_region.h -
(widget->parent->spec.scrollbar.button_size<<1);
/* move */
gui_widget_warp( widget, 0, pos );
}
else {
/* absolute offset in parent */
pos = widget->parent_region.x +
event->motion.xrel;
if ( pos < widget->parent->spec.scrollbar.button_size )
pos = widget->parent->spec.scrollbar.button_size;
else
if ( pos >= widget->parent->parent_region.w -
(widget->parent->spec.scrollbar.button_size<<1) )
pos = widget->parent->parent_region.w -
(widget->parent->spec.scrollbar.button_size<<1);
/* move */
gui_widget_warp( widget, pos, 0 );
}
/* update value */
gui_scrollbar_adjust( widget->parent );
}
/* send event */
gui_widget_call_user_event_handler(
widget->parent, event );
}
/*
====================================================================
PUBLICS
====================================================================
*/
/*
====================================================================
Create an either vertical or horizontal scrollbar. The increase/
decrease/track buttons are square.
====================================================================
*/
GuiWidget* gui_scrollbar_create(
GuiWidget *parent, int x, int y, int width, int height,
void (*user_event_handler)(GuiWidget*,GuiEvent*),
int vertical, int min, int max, int step, int jump, int value )
{
int size;
GuiWidget *widget = gui_widget_create(
parent, GUI_SCROLLBAR, x, y, width, height,
default_event_handler, user_event_handler );
/* events */
gui_widget_enable_event( widget, GUI_CHANGED );
/* create surface and wallpaper it */
widget->surface = stk_surface_create(
SDL_SWSURFACE, width, height );
SDL_SetColorKey( widget->surface, 0,0 );
stk_surface_apply_wallpaper(
widget->surface, 0, 0, -1, -1,
gui_theme->widget_wallpaper, -1 );
/* get scrollbar size and add frame */
if ( vertical ) {
size = width;
stk_surface_apply_frame(
widget->surface, 0, size, size, height - 2 * size,
gui_theme->widget_frame );
}
else {
size = height;
stk_surface_apply_frame(
widget->surface, size, 0, width - 2 * size, size,
gui_theme->widget_frame );
}
/* various */
widget->spec.scrollbar.vertical = vertical;
widget->spec.scrollbar.button_size = size;
/* add inc/dec/track buttons */
widget->spec.scrollbar.dec =
gui_button_create( widget, 0, 0, size, size,
gui_scrollbar_dec_handler,
gui_theme->scrollbar_arrows,
(vertical)?0:
(gui_theme->scrollbar_arrow_size*2),
0,
gui_theme->scrollbar_arrow_size,
gui_theme->scrollbar_arrow_size, 0 );
gui_widget_disable_event( widget->spec.scrollbar.dec, GUI_FOCUS_IN );
gui_widget_disable_event( widget->spec.scrollbar.dec, GUI_FOCUS_OUT );
widget->spec.scrollbar.inc =
gui_button_create( widget,
(vertical)?0:(width-size),
(vertical)?(height-size):0,
size, size,
gui_scrollbar_inc_handler,
gui_theme->scrollbar_arrows,
gui_theme->scrollbar_arrow_size +
((vertical)?0:
(gui_theme->scrollbar_arrow_size*2)),
0,
gui_theme->scrollbar_arrow_size,
gui_theme->scrollbar_arrow_size, 0 );
gui_widget_disable_event( widget->spec.scrollbar.inc, GUI_FOCUS_IN );
gui_widget_disable_event( widget->spec.scrollbar.inc, GUI_FOCUS_OUT );
widget->spec.scrollbar.track =
gui_button_create( widget, 0, 0, size, size,
gui_scrollbar_track_handler,
0,0,0,0,0, 0 );
/* our trackbutton needs the motion event monitored */
gui_widget_enable_event( widget->spec.scrollbar.track, GUI_MOTION );
gui_widget_disable_event( widget->spec.scrollbar.track, GUI_FOCUS_IN );
gui_widget_disable_event( widget->spec.scrollbar.track, GUI_FOCUS_OUT );
/* track grabs focus if pressed to simplify usage */
widget->spec.scrollbar.track->grab_focus = 1;
/* range */
gui_scrollbar_set_range( widget, min, max, step, jump );
gui_scrollbar_set_value( widget, value );
/* done */
return widget;
}
/*
====================================================================
Set or get scrollbar value. Get returns False if this was no
scrollbar.
====================================================================
*/
void gui_scrollbar_set_value( GuiWidget *widget, int value )
{
if ( widget->type == GUI_SCROLLBAR ) {
widget->spec.scrollbar.value = value;
gui_scrollbar_update_track( widget );
}
}
int gui_scrollbar_get_value( GuiWidget *widget, int *value )
{
if ( widget->type != GUI_SCROLLBAR )
return 0;
*value = widget->spec.scrollbar.value;
return 1;
}
/*
====================================================================
Set the range of the scrollbar. Stores refresh rects if visible.
-1 for any value means to keep the current setting.
====================================================================
*/
int gui_scrollbar_set_range(
GuiWidget *widget, int min, int max, int step, int jump )
{
if ( widget->type != GUI_SCROLLBAR )
return 0;
if ( min != -1 ) widget->spec.scrollbar.min = min;
if ( max != -1 ) widget->spec.scrollbar.max = max;
if ( step != -1 ) widget->spec.scrollbar.step = step;
if ( jump != -1 ) widget->spec.scrollbar.jump = jump;
gui_scrollbar_update_track( widget );
return 1;
}
/*
====================================================================
Modify value of scrollbar by the passed amount and update,
return True if it has changed and call event handler with
GUI_CHANGED.
====================================================================
*/
int gui_scrollbar_add( GuiWidget *widget, int change )
{
int old_value = widget->spec.scrollbar.value;
if ( widget->type != GUI_SCROLLBAR ) return 0;
widget->spec.scrollbar.value += change;
if ( widget->spec.scrollbar.value < widget->spec.scrollbar.min )
widget->spec.scrollbar.value = widget->spec.scrollbar.min;
if ( widget->spec.scrollbar.value > widget->spec.scrollbar.max )
widget->spec.scrollbar.value = widget->spec.scrollbar.max;
gui_scrollbar_update_track( widget );
if ( old_value != widget->spec.scrollbar.value ) {
gui_widget_call_user_event_handler(
widget, gui_event_get_simple( GUI_CHANGED ) );
return 1;
}
return 0;
}
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