Renamed existing lbreakout2 to prevent misunderstangdings, fixed download data in LTris and LMarbles
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pelya
350
project/jni/application/lbreakout2-hwaccel/gui/gui_scrollbar.c
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350
project/jni/application/lbreakout2-hwaccel/gui/gui_scrollbar.c
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/***************************************************************************
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gui_scrollbar.c - description
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-------------------
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begin : Wed Oct 16 2002
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copyright : (C) 2002 by Michael Speck
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email : kulkanie@gmx.net
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include <stdlib.h>
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#include "gui_widget.h"
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#include "gui_button.h"
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#include "gui_scrollbar.h"
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extern GuiTheme *gui_theme;
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extern SDL_Surface *stk_display;
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/*
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====================================================================
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LOCALS
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====================================================================
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*/
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/*
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====================================================================
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Default event handler
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====================================================================
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*/
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static void default_event_handler(
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GuiWidget *widget, GuiEvent *event )
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{
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switch ( event->type ) {
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case GUI_DESTROY:
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break;
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case GUI_DRAW:
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/* display surface */
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stk_surface_blit(
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widget->surface, 0, 0, -1, -1,
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stk_display,
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widget->screen_region.x,
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widget->screen_region.y );
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break;
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case GUI_BUTTON_PRESSED:
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if ( widget->spec.scrollbar.vertical ) {
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if ( event->button.y <
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widget->spec.scrollbar.track->
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screen_region.y )
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gui_scrollbar_add( widget,
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-widget->spec.scrollbar.jump );
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else
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gui_scrollbar_add( widget,
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widget->spec.scrollbar.jump );
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}
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else {
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if ( event->button.x <
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widget->spec.scrollbar.track->
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screen_region.x )
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gui_scrollbar_add( widget,
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-widget->spec.scrollbar.jump );
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else
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gui_scrollbar_add( widget,
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widget->spec.scrollbar.jump );
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}
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break;
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}
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}
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/*
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====================================================================
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Warp track button of scrollbar to correct position.
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====================================================================
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*/
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static void gui_scrollbar_update_track( GuiWidget *widget )
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{
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int offset;
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if ( widget->type != GUI_SCROLLBAR ) return;
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if ( widget->spec.scrollbar.min == widget->spec.scrollbar.max )
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offset = 0;
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else
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offset =
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(((widget->spec.scrollbar.vertical) ?
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widget->parent_region.h :
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widget->parent_region.w) -
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(widget->spec.scrollbar.button_size * 3) ) *
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widget->spec.scrollbar.value /
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(widget->spec.scrollbar.max - widget->spec.scrollbar.min);
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gui_widget_warp( widget->spec.scrollbar.track,
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(widget->spec.scrollbar.vertical) ? 0 :
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(offset + widget->spec.scrollbar.button_size),
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(widget->spec.scrollbar.vertical)?
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(offset + widget->spec.scrollbar.button_size) : 0 );
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}
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/*
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====================================================================
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Update the scrollbar value by position of track button,
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return True if it has changed and call event handler with
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GUI_CHANGED.
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====================================================================
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*/
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static int gui_scrollbar_adjust( GuiWidget *widget )
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{
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int new_value;
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if ( widget->type != GUI_SCROLLBAR ) return 0;
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new_value = (((widget->spec.scrollbar.vertical) ?
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widget->spec.scrollbar.track->parent_region.y :
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widget->spec.scrollbar.track->parent_region.x) -
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widget->spec.scrollbar.button_size) *
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(widget->spec.scrollbar.max - widget->spec.scrollbar.min) /
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(((widget->spec.scrollbar.vertical) ?
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widget->parent_region.h :
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widget->parent_region.w) -
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widget->spec.scrollbar.button_size * 3);
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if ( new_value != widget->spec.scrollbar.value ) {
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widget->spec.scrollbar.value = new_value;
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gui_widget_call_user_event_handler(
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widget, gui_event_get_simple( GUI_CHANGED ) );
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return 1;
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}
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return 0;
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}
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/*
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====================================================================
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Default event handlers for scrollbar buttons: update the
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scrollbar if a button was clicked and pass the event to the
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scrollbar's user event handler.
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====================================================================
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*/
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static void gui_scrollbar_dec_handler(
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GuiWidget *widget, GuiEvent *event )
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{
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if ( event->type == GUI_CLICKED )
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gui_scrollbar_add( widget->parent,
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-widget->parent->spec.scrollbar.step );
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gui_widget_call_user_event_handler(
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widget->parent, event );
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}
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static void gui_scrollbar_inc_handler(
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GuiWidget *widget, GuiEvent *event )
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{
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if ( event->type == GUI_CLICKED )
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gui_scrollbar_add( widget->parent,
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widget->parent->spec.scrollbar.step );
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gui_widget_call_user_event_handler(
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widget->parent, event );
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}
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static void gui_scrollbar_track_handler(
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GuiWidget *widget, GuiEvent *event )
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{
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int pos;
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if ( event->type == GUI_MOTION )
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if ( event->motion.button ) {
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if ( widget->parent->spec.scrollbar.vertical ) {
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/* absolute offset in parent */
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pos = widget->parent_region.y +
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event->motion.yrel;
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if ( pos < widget->parent->spec.scrollbar.button_size )
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pos = widget->parent->spec.scrollbar.button_size;
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else
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if ( pos >= widget->parent->parent_region.h -
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(widget->parent->spec.scrollbar.button_size<<1) )
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pos = widget->parent->parent_region.h -
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(widget->parent->spec.scrollbar.button_size<<1);
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/* move */
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gui_widget_warp( widget, 0, pos );
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}
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else {
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/* absolute offset in parent */
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pos = widget->parent_region.x +
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event->motion.xrel;
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if ( pos < widget->parent->spec.scrollbar.button_size )
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pos = widget->parent->spec.scrollbar.button_size;
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else
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if ( pos >= widget->parent->parent_region.w -
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(widget->parent->spec.scrollbar.button_size<<1) )
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pos = widget->parent->parent_region.w -
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(widget->parent->spec.scrollbar.button_size<<1);
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/* move */
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gui_widget_warp( widget, pos, 0 );
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}
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/* update value */
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gui_scrollbar_adjust( widget->parent );
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}
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/* send event */
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gui_widget_call_user_event_handler(
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widget->parent, event );
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}
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/*
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====================================================================
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PUBLICS
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====================================================================
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*/
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/*
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====================================================================
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Create an either vertical or horizontal scrollbar. The increase/
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decrease/track buttons are square.
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====================================================================
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*/
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GuiWidget* gui_scrollbar_create(
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GuiWidget *parent, int x, int y, int width, int height,
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void (*user_event_handler)(GuiWidget*,GuiEvent*),
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int vertical, int min, int max, int step, int jump, int value )
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{
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int size;
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GuiWidget *widget = gui_widget_create(
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parent, GUI_SCROLLBAR, x, y, width, height,
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default_event_handler, user_event_handler );
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/* events */
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gui_widget_enable_event( widget, GUI_CHANGED );
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/* create surface and wallpaper it */
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widget->surface = stk_surface_create(
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SDL_SWSURFACE, width, height );
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SDL_SetColorKey( widget->surface, 0,0 );
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stk_surface_apply_wallpaper(
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widget->surface, 0, 0, -1, -1,
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gui_theme->widget_wallpaper, -1 );
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/* get scrollbar size and add frame */
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if ( vertical ) {
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size = width;
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stk_surface_apply_frame(
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widget->surface, 0, size, size, height - 2 * size,
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gui_theme->widget_frame );
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}
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else {
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size = height;
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stk_surface_apply_frame(
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widget->surface, size, 0, width - 2 * size, size,
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gui_theme->widget_frame );
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}
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/* various */
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widget->spec.scrollbar.vertical = vertical;
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widget->spec.scrollbar.button_size = size;
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/* add inc/dec/track buttons */
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widget->spec.scrollbar.dec =
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gui_button_create( widget, 0, 0, size, size,
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gui_scrollbar_dec_handler,
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gui_theme->scrollbar_arrows,
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(vertical)?0:
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(gui_theme->scrollbar_arrow_size*2),
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0,
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gui_theme->scrollbar_arrow_size,
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gui_theme->scrollbar_arrow_size, 0 );
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gui_widget_disable_event( widget->spec.scrollbar.dec, GUI_FOCUS_IN );
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gui_widget_disable_event( widget->spec.scrollbar.dec, GUI_FOCUS_OUT );
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widget->spec.scrollbar.inc =
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gui_button_create( widget,
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(vertical)?0:(width-size),
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(vertical)?(height-size):0,
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size, size,
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gui_scrollbar_inc_handler,
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gui_theme->scrollbar_arrows,
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gui_theme->scrollbar_arrow_size +
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((vertical)?0:
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(gui_theme->scrollbar_arrow_size*2)),
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0,
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gui_theme->scrollbar_arrow_size,
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gui_theme->scrollbar_arrow_size, 0 );
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gui_widget_disable_event( widget->spec.scrollbar.inc, GUI_FOCUS_IN );
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gui_widget_disable_event( widget->spec.scrollbar.inc, GUI_FOCUS_OUT );
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widget->spec.scrollbar.track =
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gui_button_create( widget, 0, 0, size, size,
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gui_scrollbar_track_handler,
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0,0,0,0,0, 0 );
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/* our trackbutton needs the motion event monitored */
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gui_widget_enable_event( widget->spec.scrollbar.track, GUI_MOTION );
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gui_widget_disable_event( widget->spec.scrollbar.track, GUI_FOCUS_IN );
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gui_widget_disable_event( widget->spec.scrollbar.track, GUI_FOCUS_OUT );
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/* track grabs focus if pressed to simplify usage */
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widget->spec.scrollbar.track->grab_focus = 1;
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/* range */
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gui_scrollbar_set_range( widget, min, max, step, jump );
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gui_scrollbar_set_value( widget, value );
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/* done */
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return widget;
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}
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/*
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====================================================================
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Set or get scrollbar value. Get returns False if this was no
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scrollbar.
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====================================================================
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*/
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void gui_scrollbar_set_value( GuiWidget *widget, int value )
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{
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if ( widget->type == GUI_SCROLLBAR ) {
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widget->spec.scrollbar.value = value;
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gui_scrollbar_update_track( widget );
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}
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}
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int gui_scrollbar_get_value( GuiWidget *widget, int *value )
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{
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if ( widget->type != GUI_SCROLLBAR )
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return 0;
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*value = widget->spec.scrollbar.value;
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return 1;
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}
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/*
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====================================================================
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Set the range of the scrollbar. Stores refresh rects if visible.
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-1 for any value means to keep the current setting.
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====================================================================
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*/
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int gui_scrollbar_set_range(
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GuiWidget *widget, int min, int max, int step, int jump )
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{
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if ( widget->type != GUI_SCROLLBAR )
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return 0;
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if ( min != -1 ) widget->spec.scrollbar.min = min;
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if ( max != -1 ) widget->spec.scrollbar.max = max;
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if ( step != -1 ) widget->spec.scrollbar.step = step;
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if ( jump != -1 ) widget->spec.scrollbar.jump = jump;
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gui_scrollbar_update_track( widget );
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return 1;
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}
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/*
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====================================================================
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Modify value of scrollbar by the passed amount and update,
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return True if it has changed and call event handler with
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GUI_CHANGED.
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====================================================================
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*/
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int gui_scrollbar_add( GuiWidget *widget, int change )
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{
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int old_value = widget->spec.scrollbar.value;
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if ( widget->type != GUI_SCROLLBAR ) return 0;
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widget->spec.scrollbar.value += change;
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if ( widget->spec.scrollbar.value < widget->spec.scrollbar.min )
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widget->spec.scrollbar.value = widget->spec.scrollbar.min;
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if ( widget->spec.scrollbar.value > widget->spec.scrollbar.max )
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widget->spec.scrollbar.value = widget->spec.scrollbar.max;
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gui_scrollbar_update_track( widget );
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if ( old_value != widget->spec.scrollbar.value ) {
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gui_widget_call_user_event_handler(
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widget, gui_event_get_simple( GUI_CHANGED ) );
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return 1;
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}
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return 0;
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}
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