Add scrollbar source code.

include/scrollbar.h

@@ -0,0 +1,24 @@
+#ifndef ROFI_SCROLLBAR_H
+#define ROFI_SCROLLBAR_H
+
+typedef struct _scrollbar
+{
+    Window       window, parent;
+    short        x, y, w, h;
+    GC           gc;
+    unsigned int length;
+    unsigned int pos;
+    unsigned int pos_length;
+} scrollbar;
+
+scrollbar *scrollbar_create ( Window parent, XVisualInfo *vinfo, Colormap map,
+                              short x, short y, short w, short h );
+
+void scrollbar_hide ( scrollbar *sb );
+void scrollbar_show ( scrollbar *sb );
+void scrollbar_free ( scrollbar *sb );
+void scrollbar_set_pos_length ( scrollbar *sb, unsigned int pos_length );
+void scrollbar_set_pos ( scrollbar *sb, unsigned int pos );
+void scrollbar_set_length ( scrollbar *sb, unsigned int length );
+void scrollbar_draw ( scrollbar *sb );
+#endif // ROFI_SCROLLBAR_H

source/scrollbar.c

@@ -0,0 +1,120 @@
+/**
+ *   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 );
+}