tag previews are back

TODO

@@ -1,5 +1,4 @@
 - Give proper credit to authors of patches that went into this project.
 - Document the bar better.
 - Rewrite statuscmd and powerline status syntax so that they can be used together.
-- Readd tag previews
 - Fix setbarheight() not working properly.

keybinds.h

@@ -35,6 +35,7 @@
 
 /* Tag related keybinds */
 #define TAGKEYS(CHAIN,KEY,TAG) { MODIFIER1,                   CHAIN, KEY, view,       {.ui = 1 << TAG } },  \
+                               { MODIFIER1|SHIFT,             CHAIN, KEY, previewtag, {.ui = TAG      } },  \
 							   { MODIFIER1|CONTROL,           CHAIN, KEY, toggleview, {.ui = 1 << TAG } },  \
 							   { MODIFIER1|SHIFT|CONTROL,     CHAIN, KEY, tag,        {.ui = 1 << TAG } },  
 

speedwm.c

@@ -293,9 +293,14 @@ typedef struct {
 typedef struct Pertag Pertag;
 struct Monitor {
 	char ltsymbol[16];     /* current layout symbol */
-#if USEIPC
+    #if USEIPC
 	char lastltsymbol[16]; /* previous layout symbol */
-#endif
+    #endif
+    #if USETAGPREVIEW
+    int previewshow;
+    Window tagwin;
+    Pixmap *tagmap;
+    #endif
 	float mfact;          /* mfact value */
 	float cfact;          /* cfact value */
 	int ltaxis[4];
@@ -718,6 +723,15 @@ static int xerrorstart(Display *dpy, XErrorEvent *ee);
 static void xinitvisual();
 static void zoom(const Arg *arg);
 
+/* Tag preview functions */
+#if USETAGPREVIEW
+static void showtagpreview(unsigned int i);
+static void takepreview(void);
+#endif
+
+/* We will keep this one, in order to keep keybinds.h clean. */
+static void previewtag(const Arg *arg);
+
 #include "bar/items.h"
 
 /* switcher funcs */
@@ -1101,6 +1115,10 @@ arrange(Monitor *m)
 		restack(m);
 	} else for (m = mons; m; m = m->next)
 		arrangemon(m);
+
+    #if USETAGPREVIEW
+    takepreview();
+    #endif
 }
 
 void
@@ -1446,6 +1464,16 @@ cleanupmon(Monitor *mon)
 		for (m = mons; m && m->next != mon; m = m->next);
 		m->next = mon->next;
 	}
+    #if USETAGPREVIEW
+    size_t i;
+    
+    for (i = 0; i < LENGTH(tags); i++)
+		if (mon->tagmap[i])
+			XFreePixmap(dpy, mon->tagmap[i]);
+	free(mon->tagmap);
+    XUnmapWindow(dpy, mon->tagwin);
+	XDestroyWindow(dpy, mon->tagwin);
+    #endif
 	free(mon);
 }
 
@@ -1727,9 +1755,15 @@ createmon(void)
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 
-#if USESWITCHER
+    #if USETAGPREVIEW
+    /* map our tags */
+  	m->tagmap = ecalloc(LENGTH(tags), sizeof(Pixmap));
+    #endif
+
+    #if USESWITCHER
+    /* number of clients, defaults to 0 */
 	m->nclients = 0;
-#endif
+    #endif
 
 	/* pertag */
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
@@ -3469,6 +3503,9 @@ toggleview(const Arg *arg)
 	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
 
 	if (newtagset) {
+        #if USETAGPREVIEW
+        takepreview();
+        #endif
 		selmon->tagset[selmon->seltags] = newtagset;
 		focus(NULL);
 		arrange(selmon);
@@ -5565,6 +5602,15 @@ updatebars(void)
 	};
 	XClassHint ch = {"speedwm", "speedwm"};
 	for (m = mons; m; m = m->next) {
+        #if USETAGPREVIEW
+        if (!m->tagwin) {
+            	m->tagwin = XCreateWindow(dpy, root, m->wx, m->bar->by + bh, m->mw / scalepreview, m->mh / scalepreview, 0,
+		            depth, CopyFromParent, visual, CWOverrideRedirect|CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &wa);
+			XDefineCursor(dpy, m->tagwin, cursor[CurNormal]->cursor);
+			XUnmapWindow(dpy, m->tagwin);
+		}
+        #endif
+
     	for (bar = m->bar; bar; bar = bar->next) {
 			if (!bar->win) {
 				bar->win = XCreateWindow(dpy, root, bar->bx, bar->by, bar->bw, bar->bh, 0, depth,
@@ -5999,6 +6045,9 @@ view(const Arg *arg)
 		togglebar(NULL);
     }
 
+    #if USETAGPREVIEW
+    takepreview();
+    #endif
 	focus(NULL);
 	arrange(NULL);
 	updatecurrentdesktop();
@@ -6416,5 +6465,88 @@ inplacerotate(const Arg *arg)
 	focus(c);
 }
 
+#if USETAGPREVIEW
+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)
+        if (!selmon->hideemptytags)
+            occ |= c->tags;
+        else
+            occ |= c->tags == 255 ? 0 : c->tags;
+
+	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;
+		}
+
+		selmon->previewshow = 0;
+		XUnmapWindow(dpy, selmon->tagwin);
+		XSync(dpy, False);
+
+		if (!(image = imlib_create_image(tw, sh))) {
+			fprintf(stderr, "speedwm: imlib: failed to create image, skipping.");
+			continue;
+		}
+		imlib_context_set_image(image);
+		imlib_context_set_display(dpy);
+		imlib_image_set_has_alpha(1);
+		imlib_context_set_blend(0);
+		imlib_context_set_visual(visual);
+		imlib_context_set_drawable(root);
+
+       	if (!barpreview)
+				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, depth);
+		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();
+	}
+}
+#endif
+
+void
+previewtag(const Arg *arg)
+{
+    #if USETAGPREVIEW
+	if (selmon->previewshow != (arg->ui + 1))
+		selmon->previewshow = arg->ui + 1;
+	else
+		selmon->previewshow = 0;
+	showtagpreview(arg->ui);
+    #else
+    return;
+    #endif
+}
+
+
 /* Layout code */
 #include "layouts.c" /* Enable patched layouts */

toggle.h

@@ -32,4 +32,4 @@ Not compatible with BSDs so for those, set this to 0. */
  */
 #define USEIMLIB2        1 /* Whether or not to include imlib2. Required by USEWINICON and USETAGPREVIEW. */
 #define USEWINICON       1 /* Whether or not to include window icons. Requires imlib to be enabled in toggle.mk and it must be installed. */
-#define USETAGPREVIEW    0 /* Whether or not to include tag previews. Requires imlib to be enabled in toggle.mk and it must be installed. */
+#define USETAGPREVIEW    1 /* Whether or not to include tag previews. Requires imlib to be enabled in toggle.mk and it must be installed. */