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/*
* rofi
*
* MIT/X11 License
* Copyright © 2013-2021 Qball Cow <qball@gmpclient.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <config.h>
#include <xkbcommon/xkbcommon.h>
#include <glib.h>
#include "widgets/textbox.h"
#include "widgets/icon.h"
#include "widgets/listview.h"
#include "widgets/scrollbar.h"
#include "theme.h"
/** The default width of the scrollbar */
#define DEFAULT_SCROLLBAR_WIDTH 8
static void scrollbar_draw ( widget *, cairo_t * );
static void scrollbar_free ( widget * );
static int scrollbar_get_desired_height ( widget *wid )
{
// Want height we are.
return wid->h;
}
// TODO
// This should behave more like a real scrollbar.
guint scrollbar_scroll_get_line ( const scrollbar *sb, int y )
{
y -= sb->widget.border.top.base.distance;
if ( y < 0 ) {
return 0;
}
if ( y > sb->widget.h ) {
return sb->length - 1;
}
short r = ( sb->length * sb->widget.h ) / ( (double) ( sb->length + sb->pos_length ) );
short handle = sb->widget.h - r;
double sec = ( ( r ) / (double) ( sb->length - 1 ) );
short half_handle = handle / 2;
y -= half_handle;
y = MIN ( MAX ( 0, y ), sb->widget.h - 2 * half_handle );
unsigned int sel = ( ( y ) / sec );
return MIN ( sel, sb->length - 1 );
}
static void scrollbar_scroll ( scrollbar *sb, int y )
{
listview_set_selected ( (listview *) sb->widget.parent, scrollbar_scroll_get_line ( sb, y ) );
}
static WidgetTriggerActionResult scrollbar_trigger_action ( widget *wid, MouseBindingMouseDefaultAction action, G_GNUC_UNUSED gint x, gint y, G_GNUC_UNUSED void *user_data )
{
scrollbar *sb = (scrollbar *) wid;
switch ( action )
{
case MOUSE_CLICK_DOWN:
return WIDGET_TRIGGER_ACTION_RESULT_GRAB_MOTION_BEGIN;
case MOUSE_CLICK_UP:
scrollbar_scroll ( sb, y );
return WIDGET_TRIGGER_ACTION_RESULT_GRAB_MOTION_END;
case MOUSE_DCLICK_DOWN:
case MOUSE_DCLICK_UP:
break;
}
return FALSE;
}
static gboolean scrollbar_motion_notify ( widget *wid, G_GNUC_UNUSED gint x, gint y )
{
scrollbar *sb = (scrollbar *) wid;
scrollbar_scroll ( sb, y );
return TRUE;
}
scrollbar *scrollbar_create ( widget *parent, const char *name )
{
scrollbar *sb = g_malloc0 ( sizeof ( scrollbar ) );
widget_init ( WIDGET ( sb ), parent, WIDGET_TYPE_SCROLLBAR, name );
sb->widget.x = 0;
sb->widget.y = 0;
sb->width = rofi_theme_get_distance ( WIDGET ( sb ), "handle-width", DEFAULT_SCROLLBAR_WIDTH );
int width = distance_get_pixel ( sb->width, ROFI_ORIENTATION_HORIZONTAL );
sb->widget.w = widget_padding_get_padding_width ( WIDGET ( sb ) ) + width;
sb->widget.h = widget_padding_get_padding_height ( WIDGET ( sb ) );
sb->widget.draw = scrollbar_draw;
sb->widget.free = scrollbar_free;
sb->widget.trigger_action = scrollbar_trigger_action;
sb->widget.motion_notify = scrollbar_motion_notify;
sb->widget.get_desired_height = scrollbar_get_desired_height;
sb->length = 10;
sb->pos = 0;
sb->pos_length = 4;
return sb;
}
static void scrollbar_free ( widget *wid )
{
scrollbar *sb = (scrollbar *) wid;
g_free ( sb );
}
void scrollbar_set_max_value ( scrollbar *sb, unsigned int max )
{
if ( sb != NULL ) {
sb->length = MAX ( 1u, max );
}
}
void scrollbar_set_handle ( scrollbar *sb, unsigned int pos )
{
if ( sb != NULL ) {
sb->pos = MIN ( sb->length, pos );
}
}
void scrollbar_set_handle_length ( scrollbar *sb, unsigned int pos_length )
{
if ( sb != NULL ) {
sb->pos_length = MIN ( sb->length, MAX ( 1u, pos_length ) );
}
}
/**
* The range is the height - handle length.
* r = h - handle;
* handle is the element length of the handle* length of one element.
* handle = r / ( num ) * hl
*
* r = h - r / ( num) *hl
* r*num = num*h - r*hl
* r*num+r*hl = num*h;
* r ( num+hl ) = num*h
* r = (num*h)/(num+hl)
*/
static void scrollbar_draw ( widget *wid, cairo_t *draw )
{
scrollbar *sb = (scrollbar *) wid;
unsigned int wh = widget_padding_get_remaining_height ( wid );
// Calculate position and size.
unsigned int r = ( sb->length * wh ) / ( (double) ( sb->length + sb->pos_length ) );
unsigned int handle = wid->h - r;
double sec = ( ( r ) / (double) ( sb->length - 1 ) );
unsigned int height = handle;
unsigned int y = sb->pos * sec;
// Set max pos.
y = MIN ( y, wh - handle );
// Never go out of bar.
height = MAX ( 2, height );
// Cap length;
rofi_theme_get_color ( WIDGET ( sb ), "handle-color", draw );
cairo_rectangle ( draw,
widget_padding_get_left ( wid ),
widget_padding_get_top ( wid ) + y,
widget_padding_get_remaining_width ( wid ),
height );
cairo_fill ( draw );
}
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