suckless/dwm/patches/dwm-tag-preview-6.3.diff

From 841ad7d5767f945ee9da6c5afc8cff98ca2f8231 Mon Sep 17 00:00:00 2001
From: explosion-mental <explosion0mental@gmail.com>
Date: Thu, 1 Sep 2022 16:21:58 -0500
Subject: [PATCH] [PATCH] tag previews: free() tagmap and add previewtag func

Allows you to see the contents of an already viewed tag. So a more
accurate description would be to re-view a tag.

Allows you to see the contents of an already viewed tag. So a more
accurate description would be to re-view a tag.

Compatibility with the alpha patch (replacing DefaultDepth() and
DefaultVisual() with depth and visual + window masks) and hide vacants can be
achieved, I left some lines to uncomment.

added:
* more compact structure, more probable to patch on top of other patches
  or easier to patch manually (like not moving the Monitor struct..)
* create the window preview in updatebars()
* renamed switchtag() -> takepreview(), makes more sense since it's
  "taking" the preview (basically a screenshot).
* option previewbar, whether to show the bar in the preview or not.
* previewtag which takes a tag (unsigned int from 0 to the last tag) and
  previews it. This allows to preview tags without using the
  cursor/mouse (which avoids a recursive previews preview).
  adding it to the TAGKEYS macro makes more sense so I've added it
  replacing (keybinding wise, not functionality) toggletag.
```
\#define TAGKEYS(KEY,TAG) \
	{ MODKEY,                       KEY,      view,           {.ui = 1 << TAG} }, \
	{ MODKEY|ControlMask,           KEY,      toggleview,     {.ui = 1 << TAG} }, \
	{ MODKEY|ShiftMask,             KEY,      tag,            {.ui = 1 << TAG} }, \
->	{ MODKEY|ControlMask|ShiftMask, KEY,      previewtag,     {.ui = TAG } },
```
---
 config.def.h |   4 +-
 config.mk    |   5 +-
 dwm.c        | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 145 insertions(+), 3 deletions(-)

diff --git a/config.def.h b/config.def.h
index a2ac963..eb70348 100644
--- a/config.def.h
+++ b/config.def.h
@@ -3,6 +3,8 @@
 /* appearance */
 static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
+static const int scalepreview       = 4;        /* preview scaling (display w and h / scalepreview) */
+static const int previewbar         = 1;        /* show the bar in the preview window */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
 static const char *fonts[]          = { "monospace:size=10" };
@@ -50,7 +52,7 @@ static const Layout layouts[] = {
 	{ MODKEY,                       KEY,      view,           {.ui = 1 << TAG} }, \
 	{ MODKEY|ControlMask,           KEY,      toggleview,     {.ui = 1 << TAG} }, \
 	{ MODKEY|ShiftMask,             KEY,      tag,            {.ui = 1 << TAG} }, \
-	{ MODKEY|ControlMask|ShiftMask, KEY,      toggletag,      {.ui = 1 << TAG} },
+	{ MODKEY|ControlMask|ShiftMask, KEY,      previewtag,     {.ui = TAG } },     \
 
 /* helper for spawning shell commands in the pre dwm-5.0 fashion */
 #define SHCMD(cmd) { .v = (const char*[]){ "/bin/sh", "-c", cmd, NULL } }
diff --git a/config.mk b/config.mk
index b6eb7e0..6f5129e 100644
--- a/config.mk
+++ b/config.mk
@@ -20,9 +20,12 @@ FREETYPEINC = /usr/include/freetype2
 # OpenBSD (uncomment)
 #FREETYPEINC = ${X11INC}/freetype2
 
+# Imlib2 (tag previews)
+IMLIB2LIBS = -lImlib2
+
 # includes and libs
 INCS = -I${X11INC} -I${FREETYPEINC}
-LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS}
+LIBS = -L${X11LIB} -lX11 ${XINERAMALIBS} ${FREETYPELIBS} ${IMLIB2LIBS}
 
 # flags
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L -DVERSION=\"${VERSION}\" ${XINERAMAFLAGS}
diff --git a/dwm.c b/dwm.c
index a96f33c..0c0ba12 100644
--- a/dwm.c
+++ b/dwm.c
@@ -40,6 +40,7 @@
 #include <X11/extensions/Xinerama.h>
 #endif /* XINERAMA */
 #include <X11/Xft/Xft.h>
+#include <Imlib2.h>
 
 #include "drw.h"
 #include "util.h"
@@ -112,6 +113,9 @@ typedef struct {
 } Layout;
 
 struct Monitor {
+	int previewshow;
+	Window tagwin;
+	Pixmap *tagmap;
 	char ltsymbol[16];
 	float mfact;
 	int nmaster;
@@ -235,6 +239,10 @@ static int xerrordummy(Display *dpy, XErrorEvent *ee);
 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 static void zoom(const Arg *arg);
 
+static void showtagpreview(unsigned int i);
+static void takepreview(void);
+static void previewtag(const Arg *arg);
+
 /* variables */
 static const char broken[] = "broken";
 static char stext[256];
@@ -438,6 +446,11 @@ buttonpress(XEvent *e)
 		if (i < LENGTH(tags)) {
 			click = ClkTagBar;
 			arg.ui = 1 << i;
+			/* hide preview if we click the bar */
+			if (selmon->previewshow) {
+				selmon->previewshow = 0;
+				XUnmapWindow(dpy, selmon->tagwin);
+			}
 		} else if (ev->x < x + blw)
 			click = ClkLtSymbol;
 		else if (ev->x > selmon->ww - (int)TEXTW(stext))
@@ -498,6 +511,7 @@ void
 cleanupmon(Monitor *mon)
 {
 	Monitor *m;
+	size_t i;
 
 	if (mon == mons)
 		mons = mons->next;
@@ -505,8 +519,14 @@ cleanupmon(Monitor *mon)
 		for (m = mons; m && m->next != mon; m = m->next);
 		m->next = mon->next;
 	}
+	for (i = 0; i < LENGTH(tags); i++)
+		if (mon->tagmap[i])
+			XFreePixmap(dpy, mon->tagmap[i]);
+	free(mon->tagmap);
 	XUnmapWindow(dpy, mon->barwin);
 	XDestroyWindow(dpy, mon->barwin);
+	XUnmapWindow(dpy, mon->tagwin);
+	XDestroyWindow(dpy, mon->tagwin);
 	free(mon);
 }
 
@@ -641,6 +661,7 @@ createmon(void)
 	m->topbar = topbar;
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
+	m->tagmap = ecalloc(LENGTH(tags), sizeof(Pixmap));
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 	return m;
 }
@@ -1125,6 +1146,36 @@ motionnotify(XEvent *e)
 	static Monitor *mon = NULL;
 	Monitor *m;
 	XMotionEvent *ev = &e->xmotion;
+	unsigned int i, x;
+
+	if (ev->window == selmon->barwin) {
+		i = x = 0;
+		do
+			x += TEXTW(tags[i]);
+		while (ev->x >= x && ++i < LENGTH(tags));
+	/* FIXME when hovering the mouse over the tags and we view the tag,
+	 *       the preview window get's in the preview shot */
+
+	     	if (i < LENGTH(tags)) {
+			if (selmon->previewshow != (i + 1)
+			&& !(selmon->tagset[selmon->seltags] & 1 << i)) {
+				selmon->previewshow = i + 1;
+				showtagpreview(i);
+			} else if (selmon->tagset[selmon->seltags] & 1 << i) {
+				selmon->previewshow = 0;
+				XUnmapWindow(dpy, selmon->tagwin);
+			}
+		} else if (selmon->previewshow) {
+			selmon->previewshow = 0;
+			XUnmapWindow(dpy, selmon->tagwin);
+		}
+	} else if (ev->window == selmon->tagwin) {
+		selmon->previewshow = 0;
+		XUnmapWindow(dpy, selmon->tagwin);
+	} else if (selmon->previewshow) {
+		selmon->previewshow = 0;
+		XUnmapWindow(dpy, selmon->tagwin);
+	}
 
 	if (ev->window != root)
 		return;
@@ -1530,6 +1581,82 @@ setmfact(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+showtagpreview(unsigned int i)
+{
+	if (!selmon->previewshow || !selmon->tagmap[i]) {
+		XUnmapWindow(dpy, selmon->tagwin);
+		return;
+	}
+
+	XSetWindowBackgroundPixmap(dpy, selmon->tagwin, selmon->tagmap[i]);
+	XCopyArea(dpy, selmon->tagmap[i], selmon->tagwin, drw->gc, 0, 0,
+			selmon->mw / scalepreview, selmon->mh / scalepreview,
+			0, 0);
+	XSync(dpy, False);
+	XMapRaised(dpy, selmon->tagwin);
+}
+
+void
+takepreview(void)
+{
+	Client *c;
+	Imlib_Image image;
+	unsigned int occ = 0, i;
+
+	for (c = selmon->clients; c; c = c->next)
+		occ |= c->tags;
+		//occ |= c->tags == 255 ? 0 : c->tags; /* hide vacants */
+
+	for (i = 0; i < LENGTH(tags); i++) {
+		/* searching for tags that are occupied && selected */
+		if (!(occ & 1 << i) || !(selmon->tagset[selmon->seltags] & 1 << i))
+			continue;
+
+		if (selmon->tagmap[i]) { /* tagmap exist, clean it */
+			XFreePixmap(dpy, selmon->tagmap[i]);
+			selmon->tagmap[i] = 0;
+		}
+
+		/* try to unmap the window so it doesn't show the preview on the preview */
+		selmon->previewshow = 0;
+		XUnmapWindow(dpy, selmon->tagwin);
+		XSync(dpy, False);
+
+		if (!(image = imlib_create_image(sw, sh))) {
+			fprintf(stderr, "dwm: imlib: failed to create image, skipping.");
+			continue;
+		}
+		imlib_context_set_image(image);
+		imlib_context_set_display(dpy);
+		/* uncomment if using alpha patch */
+		//imlib_image_set_has_alpha(1);
+		//imlib_context_set_blend(0);
+		//imlib_context_set_visual(visual);
+		imlib_context_set_visual(DefaultVisual(dpy, screen));
+		imlib_context_set_drawable(root);
+
+		if (previewbar)
+			imlib_copy_drawable_to_image(0, selmon->wx, selmon->wy, selmon->ww, selmon->wh, 0, 0, 1);
+		else
+			imlib_copy_drawable_to_image(0, selmon->mx, selmon->my, selmon->mw ,selmon->mh, 0, 0, 1);
+		selmon->tagmap[i] = XCreatePixmap(dpy, selmon->tagwin, selmon->mw / scalepreview, selmon->mh / scalepreview, DefaultDepth(dpy, screen));
+		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
+previewtag(const Arg *arg)
+{
+	if (selmon->previewshow != (arg->ui + 1))
+		selmon->previewshow = arg->ui + 1;
+	else
+		selmon->previewshow = 0;
+	showtagpreview(arg->ui);
+}
+
 void
 setup(void)
 {
@@ -1746,6 +1873,7 @@ toggleview(const Arg *arg)
 	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
 
 	if (newtagset) {
+		takepreview();
 		selmon->tagset[selmon->seltags] = newtagset;
 		focus(NULL);
 		arrange(selmon);
@@ -1811,10 +1939,18 @@ updatebars(void)
 	XSetWindowAttributes wa = {
 		.override_redirect = True,
 		.background_pixmap = ParentRelative,
-		.event_mask = ButtonPressMask|ExposureMask
+		.event_mask = ButtonPressMask|ExposureMask|PointerMotionMask
 	};
+
 	XClassHint ch = {"dwm", "dwm"};
 	for (m = mons; m; m = m->next) {
+		if (!m->tagwin) {
+			m->tagwin = XCreateWindow(dpy, root, m->wx, m->by + bh, m->mw / scalepreview,
+				m->mh / scalepreview, 0, DefaultDepth(dpy, screen), CopyFromParent,
+				DefaultVisual(dpy, screen), CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
+			XDefineCursor(dpy, m->tagwin, cursor[CurNormal]->cursor);
+			XUnmapWindow(dpy, m->tagwin);
+		}
 		if (m->barwin)
 			continue;
 		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
@@ -2043,6 +2179,7 @@ view(const Arg *arg)
 {
 	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
 		return;
+	takepreview();
 	selmon->seltags ^= 1; /* toggle sel tagset */
 	if (arg->ui & TAGMASK)
 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
-- 
2.37.3