rofi/source/scrollbar.c

/**
 *   MIT/X11 License
 *   Modified  (c) 2015 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 <X11/X.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xmd.h>
#include <X11/Xutil.h>
#include <X11/Xproto.h>
#include <X11/Xft/Xft.h>
#include <glib.h>
#include "scrollbar.h"

#include "x11-helper.h"

extern Display *display;

#define SCROLLBAR_WIDTH 10

scrollbar *scrollbar_create ( Window parent, XVisualInfo *vinfo, Colormap map,
                              short x, short y, short w, short h )
{
    scrollbar *sb = g_malloc0 ( sizeof ( scrollbar ) );

    sb->parent = parent;
    sb->x      = x;
    sb->y      = y;
    sb->w      = MAX ( 1, w );
    sb->h      = MAX ( 1, h );

    sb->length     = SCROLLBAR_WIDTH;
    sb->pos        = 0;
    sb->pos_length = 4;

    XSetWindowAttributes attr;
    attr.colormap         = map;
    attr.border_pixel     = color_border ( display );
    attr.background_pixel = color_background ( display );
    sb->window            = XCreateWindow ( display, sb->parent, sb->x, sb->y, sb->w, sb->h, 1, vinfo->depth,
                                            InputOutput, vinfo->visual, CWColormap | CWBorderPixel | CWBackPixel, &attr );

    sb->gc = XCreateGC ( display, sb->window, 0, 0 );
    XSetForeground ( display, sb->gc, color_separator ( display ) );
    //XSetFillStyle ( display, sb->gc, FillSolid);

    // Create GC.
    return sb;
}

void scrollbar_show ( scrollbar *sb )
{
    XMapWindow ( display, sb->window );
}
void scrollbar_hide ( scrollbar *sb )
{
    XUnmapWindow ( display, sb->window );
}

void scrollbar_free ( scrollbar *sb )
{
    XFreeGC ( display, sb->gc );
    XDestroyWindow ( display, sb->window );
    g_free ( sb );
}

void scrollbar_set_length ( scrollbar *sb, unsigned int length )
{
    sb->length = MAX ( 1, length );
}

void scrollbar_set_pos ( scrollbar *sb, unsigned int pos )
{
    sb->pos = MIN ( sb->length, MAX ( 0, pos ) );
}

void scrollbar_set_pos_length ( scrollbar *sb, unsigned int pos_length )
{
    sb->pos_length = MIN ( sb->length, MAX ( 1, pos_length ) );
}

void scrollbar_draw ( scrollbar *sb )
{
    // Calculate position and size.
    const short bh     = sb->h - 2;
    float       sec    = ( ( bh ) / (float) sb->length );
    short       height = sb->pos_length * sec;
    short       y      = sb->pos * sec + 1;
    // Set max pos.
    y      = MIN ( y, bh - 2 );
    // Never go out of bar.
    height = MAX ( 2, height );
    // Cap length;
    height = MIN ( bh - y, ( height ) );
    // Redraw base window
    XClearWindow ( display, sb->window );
    // Paint the handle. 
    XFillRectangle ( display, sb->window, sb->gc, 1, y, SCROLLBAR_WIDTH - 2, height );
}