Adding tagpreview patch (#271)

patch/bar.c

@@ -0,0 +1,39 @@
+void
+barhover(XEvent *e, Bar *bar)
+{
+	const BarRule *br;
+	Monitor *m = bar->mon;
+	XMotionEvent *ev = &e->xmotion;
+	BarArg barg = { 0, 0, 0, 0 };
+	int r;
+
+	for (r = 0; r < LENGTH(barrules); r++) {
+		br = &barrules[r];
+		if (br->bar != bar->idx || (br->monitor == 'A' && m != selmon) || br->hoverfunc == NULL)
+			continue;
+		if (br->monitor != 'A' && br->monitor != -1 && br->monitor != bar->mon->num)
+			continue;
+		if (bar->x[r] > ev->x || ev->x > bar->x[r] + bar->w[r])
+			continue;
+
+		barg.x = ev->x - bar->x[r];
+		barg.y = ev->y - bar->borderpx;
+		barg.w = bar->w[r];
+		barg.h = bar->bh - 2 * bar->borderpx;
+
+		br->hoverfunc(bar, &barg, ev);
+		break;
+	}
+}
+
+Bar *
+wintobar(Window win)
+{
+	Monitor *m;
+	Bar *bar;
+	for (m = mons; m; m = m->next)
+		for (bar = m->bar; bar; bar = bar->next)
+			if (bar->win == win)
+				return bar;
+	return NULL;
+}

patch/bar.h

@@ -0,0 +1,2 @@
+static void barhover(XEvent *e, Bar *bar);
+static Bar *wintobar(Window win);

patch/bar_tagpreview.c

@@ -0,0 +1,95 @@
+#include <Imlib2.h>
+
+void
+showtagpreview(int tag, int x, int y)
+{
+	if (selmon->tagmap[tag]) {
+		XSetWindowBackgroundPixmap(dpy, selmon->tagwin, selmon->tagmap[tag]);
+		XCopyArea(dpy, selmon->tagmap[tag], selmon->tagwin, drw->gc, 0, 0, selmon->mw / scalepreview, selmon->mh / scalepreview, 0, 0);
+		XMoveWindow(dpy, selmon->tagwin, x, y);
+		XSync(dpy, False);
+		XMapWindow(dpy, selmon->tagwin);
+	} else
+		XUnmapWindow(dpy, selmon->tagwin);
+}
+
+void
+hidetagpreview(Monitor *m)
+{
+	m->previewshow = 0;
+	XUnmapWindow(dpy, m->tagwin);
+}
+
+void
+tagpreviewswitchtag(void)
+{
+	int i;
+	unsigned int occ = 0;
+	Client *c;
+	Imlib_Image image;
+
+	for (c = selmon->clients; c; c = c->next)
+		occ |= c->tags;
+	for (i = 0; i < NUMTAGS; i++) {
+		if (selmon->tagset[selmon->seltags] & 1 << i) {
+					if (selmon->tagmap[i] != 0) {
+				XFreePixmap(dpy, selmon->tagmap[i]);
+				selmon->tagmap[i] = 0;
+			}
+			if (occ & 1 << i) {
+				image = imlib_create_image(sw, sh);
+				imlib_context_set_image(image);
+				imlib_context_set_display(dpy);
+				#if BAR_ALPHA_PATCH
+				imlib_image_set_has_alpha(1);
+				imlib_context_set_blend(0);
+				imlib_context_set_visual(visual);
+				#else
+				imlib_context_set_visual(DefaultVisual(dpy, screen));
+				#endif // BAR_ALPHA_PATCH
+				imlib_context_set_drawable(root);
+				imlib_copy_drawable_to_image(0, selmon->mx, selmon->my, selmon->mw ,selmon->mh, 0, 0, 1);
+				#if BAR_ALPHA_PATCH
+				selmon->tagmap[i] = XCreatePixmap(dpy, selmon->tagwin, selmon->mw / scalepreview, selmon->mh / scalepreview, depth);
+				#else
+				selmon->tagmap[i] = XCreatePixmap(dpy, selmon->tagwin, selmon->mw / scalepreview, selmon->mh / scalepreview, DefaultDepth(dpy, screen));
+				#endif // BAR_ALPHA_PATCH
+				imlib_context_set_drawable(selmon->tagmap[i]);
+				imlib_render_image_part_on_drawable_at_size(0, 0, selmon->mw, selmon->mh, 0, 0, selmon->mw / scalepreview, selmon->mh / scalepreview);
+				imlib_free_image();
+			}
+		}
+	}
+}
+
+void
+updatepreview(void)
+{
+	Monitor *m;
+
+	XSetWindowAttributes wa = {
+		.override_redirect = True,
+		#if BAR_ALPHA_PATCH
+		.background_pixel = 0,
+		.border_pixel = 0,
+		.colormap = cmap,
+		#else
+		.background_pixmap = ParentRelative,
+		#endif // BAR_ALPHA_PATCH
+		.event_mask = ButtonPressMask|ExposureMask
+	};
+	for (m = mons; m; m = m->next) {
+		m->tagwin = XCreateWindow(dpy, root, m->wx, m->bar->by + bh, m->mw / 4, m->mh / 4, 0,
+				#if BAR_ALPHA_PATCH
+				depth, CopyFromParent, visual,
+				CWOverrideRedirect|CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &wa
+				#else
+				DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
+				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa
+				#endif // BAR_ALPHA_PATCH
+				);
+		XDefineCursor(dpy, m->tagwin, cursor[CurNormal]->cursor);
+		XMapRaised(dpy, m->tagwin);
+		XUnmapWindow(dpy, m->tagwin);
+	}
+}

patch/bar_tagpreview.h

@@ -0,0 +1,4 @@
+static void showtagpreview(int tag, int x, int y);
+static void hidetagpreview(Monitor *m);
+static void tagpreviewswitchtag(void);
+static void updatepreview(void);

patch/bar_tags.c

@@ -91,3 +91,56 @@ click_tags(Bar *bar, Arg *arg, BarArg *a)
 	return ClkTagBar;
 }
 
+int
+hover_tags(Bar *bar, BarArg *a, XMotionEvent *ev)
+{
+	#if BAR_TAGPREVIEW_PATCH
+	int i = 0, x = lrpad / 2;
+	int px, py;
+	Monitor *m = bar->mon;
+	#if VANITYGAPS_PATCH
+	int ov = gappov;
+	int oh = gappoh;
+	#else
+	int ov = 0;
+	int oh = 0;
+	#endif // VANITYGAPS_PATCH
+
+	#if BAR_HIDEVACANTTAGS_PATCH
+	Client *c;
+	unsigned int occ = 0;
+	for (c = bar->mon->clients; c; c = c->next)
+		occ |= c->tags == 255 ? 0 : c->tags;
+	#endif // BAR_HIDEVACANTTAGS_PATCH
+
+	do {
+		#if BAR_HIDEVACANTTAGS_PATCH
+		if (!(occ & 1 << i || bar->mon->tagset[bar->mon->seltags] & 1 << i))
+			continue;
+		#endif // BAR_HIDEVACANTTAGS_PATCH
+		x += TEXTW(tagicon(bar->mon, i));
+	} while (a->x >= x && ++i < NUMTAGS);
+
+	if (i < NUMTAGS) {
+		if ((i + 1) != selmon->previewshow && !(selmon->tagset[selmon->seltags] & 1 << i)) {
+			if (bar->by > m->my + m->mh / 2) // bottom bar
+				py = bar->by - m->mh / scalepreview - oh;
+			else // top bar
+				py = bar->by + bar->bh + oh;
+			px = bar->bx + ev->x - m->mw / scalepreview / 2;
+			if (px + m->mw / scalepreview > m->mx + m->mw)
+				px = m->wx + m->ww - m->mw / scalepreview - ov;
+			else if (px < bar->bx)
+				px = m->wx + ov;
+			selmon->previewshow = i + 1;
+			showtagpreview(i, px, py);
+		} else if (selmon->tagset[selmon->seltags] & 1 << i) {
+			hidetagpreview(selmon);
+		}
+	} else if (selmon->previewshow != 0) {
+		hidetagpreview(selmon);
+	}
+	#endif // BAR_TAGPREVIEW_PATCH
+
+	return 1;
+}

patch/bar_tags.h

@@ -1,4 +1,4 @@
 static int width_tags(Bar *bar, BarArg *a);
 static int draw_tags(Bar *bar, BarArg *a);
 static int click_tags(Bar *bar, Arg *arg, BarArg *a);
-
+static int hover_tags(Bar *bar, BarArg *a, XMotionEvent *ev);

patch/include.c

@@ -1,6 +1,7 @@
 /* Bar functionality */
 #include "bar_indicators.c"
 #include "bar_tagicons.c"
+#include "bar.c"
 
 #if BAR_ALPHA_PATCH
 #include "bar_alpha.c"
@@ -50,6 +51,9 @@
 #if BAR_TABGROUPS_PATCH
 #include "bar_tabgroups.c"
 #endif
+#if BAR_TAGPREVIEW_PATCH
+#include "bar_tagpreview.c"
+#endif
 #if BAR_TAGS_PATCH
 #include "bar_tags.c"
 #endif

patch/include.h

@@ -1,6 +1,7 @@
 /* Bar functionality */
 #include "bar_indicators.h"
 #include "bar_tagicons.h"
+#include "bar.h"
 
 #if BAR_ALPHA_PATCH
 #include "bar_alpha.h"
@@ -59,6 +60,9 @@
 #if BAR_TAGLABELS_PATCH
 #include "bar_taglabels.h"
 #endif
+#if BAR_TAGPREVIEW_PATCH
+#include "bar_tagpreview.h"
+#endif
 #if BAR_TAGGRID_PATCH
 #include "bar_taggrid.h"
 #endif