From d88f4d22e011deedc5e9e6f10913b161a05c7795 Mon Sep 17 00:00:00 2001
From: "Michael D. Lowis" <mike@mdlowis.com>
Date: Tue, 25 Dec 2018 22:19:59 -0500
Subject: [PATCH] added basic mouse handling and scrollbar to picker

---
 src/pick.c | 33 ++++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/src/pick.c b/src/pick.c
index 5f59fe4..1850a94 100644
--- a/src/pick.c
+++ b/src/pick.c
@@ -3,6 +3,7 @@
 #include <ctype.h>
 #include <x11.h>
 
+#define INCLUDE_DEFS
 #include "config.h"
 
 typedef struct {
@@ -135,12 +136,22 @@ static void xkeypress(XConf* x, XEvent* e) {
     } else if (key >= 0x20 && key <= 0x7F) {
         if (QueryIdx < sizeof(Query)-1)
             Query[QueryIdx++] = key;
+        Offset = ChoiceIdx = 0;
     }
     score();
 }
 
 static void xbtnpress(XConf* x, XEvent* e) {
-    (void)x, (void)e;
+    (void)x;
+    if (e->xbutton.button == Button1) {
+        int starty = x->font->height + 4;
+        e->xbutton.y = (e->xbutton.y < starty ? starty : e->xbutton.y - starty);
+        ChoiceIdx = Offset + (e->xbutton.y / x->font->height);
+    } else if (e->xbutton.button == Button4) {
+        if (Offset > 0) Offset--;
+    } else if (e->xbutton.button == Button5) {
+        if (Offset < vec_size(&Choices)) Offset++;
+    }
 }
 
 static void xresize(XConf* x, XEvent* e) {
@@ -155,9 +166,16 @@ static void xresize(XConf* x, XEvent* e) {
 static void redraw(XConf* x) {
     /* draw the background colors and border */
     size_t fheight = x->font->height;
+    size_t nlines = ((x->height - x->font->height - 4) / x->font->height) - 1;
+    size_t scroll_height = x->height - fheight - 4;
+    size_t start = (size_t)((float)Offset / (float)vec_size(&Choices) * scroll_height);
+    size_t size = (size_t)((float)nlines / (float)vec_size(&Choices) * scroll_height);
+
     x11_draw_rect(x, Palette[EditBg], 0, 0, x->width, x->height);
     x11_draw_rect(x, Palette[TagsBg], 0, 0, x->width, fheight + 4);
     x11_draw_rect(x, Palette[HorBdr], 0, fheight + 4, x->width, 1);
+    x11_draw_rect(x, Palette[ScrollBg], 0, fheight + 5, ScrollWidth+1, scroll_height);
+    x11_draw_rect(x, Palette[ScrollFg], 0, fheight + 5 + start, ScrollWidth, (size ? size : 5));
 
     /* get size of the query when printed */
     XGlyphInfo glyphinfo;
@@ -168,19 +186,16 @@ static void redraw(XConf* x) {
 
     /* draw the query and the cursor to the query region */
     int posx = 2 + glyphinfo.width + offset;
-    x11_draw_rect(x, Palette[TagsCsr], posx-1, 2,           3, 3);
-    x11_draw_rect(x, Palette[TagsCsr], posx,   2,           1, fheight);
+    x11_draw_rect(x, Palette[TagsCsr], posx-1, 2, 3, 3);
+    x11_draw_rect(x, Palette[TagsCsr], posx, 2, 1, fheight);
     x11_draw_rect(x, Palette[TagsCsr], posx-1, 2+fheight-3, 3, 3);
     x11_draw_string(x, x->font, offset + 2, fheight, Palette[TagsFg], Query);
 
     /* draw the scored and sorted results */
-    size_t nlines = ((x->height - x->font->height - 4) / x->font->height) - 1;
     for (int i = Offset, y = 2 * fheight + 4; ((size_t)i < vec_size(&Choices)) && ((size_t)i <= Offset+nlines); i++, y += fheight) {
-        bool selected = ((size_t)i == ChoiceIdx);
-        Choice* choice = (Choice*)vec_at(&Choices, i);
-        if (selected)
-            x11_draw_rect(x, Palette[EditSel], 0, y - x->font->ascent, x->width, fheight);
-        x11_draw_string(x, x->font, 2, y, Palette[TagsFg], choice->string);
+        if ((size_t)i == ChoiceIdx)
+            x11_draw_rect(x, Palette[EditSel], ScrollWidth+3, y - x->font->ascent, x->width, fheight);
+        x11_draw_string(x, x->font, ScrollWidth+3, y, Palette[TagsFg], ((Choice*)vec_at(&Choices, i))->string);
     }
     x11_flip(x);
 }
-- 
2.49.0