From 1ab9d314968f84e5b7e6530424cf08017de1f3ae Mon Sep 17 00:00:00 2001
From: "John Ankarstr\\xf6m" <john@ankarstrom.se>
Date: Sat, 29 May 2021 13:58:38 +0200
Subject: Implement 'prev' and 'prevstacked' actions

---
 src/event.c   |  6 ++++++
 src/key.c     |  2 ++
 src/key.h     | 26 +++++++++++++-----------
 src/parse.c   |  2 ++
 src/taskbar.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/taskbar.h |  3 +++
 6 files changed, 92 insertions(+), 12 deletions(-)

diff --git a/src/event.c b/src/event.c
index 3c4f0bb..4918401 100644
--- a/src/event.c
+++ b/src/event.c
@@ -360,6 +360,12 @@ void HandleKeyPress(const XKeyEvent *event) {
 	case KEY_NEXT_STACKED:
 		FocusNextStackedCircular();
 		break;
+	case KEY_PREV:
+		FocusPrevious();
+		break;
+	case KEY_PREV_STACKED:
+		FocusPreviousStackedCircular();
+		break;
 	case KEY_CLOSE:
 		if(np) {
 			DeleteClient(np);
diff --git a/src/key.c b/src/key.c
index b6e9ee6..73c6f91 100644
--- a/src/key.c
+++ b/src/key.c
@@ -242,6 +242,8 @@ int ShouldGrab(KeyType key) {
 	switch(key & 0xFF) {
 	case KEY_NEXT:
 	case KEY_NEXT_STACKED:
+	case KEY_PREV:
+	case KEY_PREV_STACKED:
 	case KEY_CLOSE:
 	case KEY_MIN:
 	case KEY_MAX:
diff --git a/src/key.h b/src/key.h
index a18aa46..736336b 100644
--- a/src/key.h
+++ b/src/key.h
@@ -22,18 +22,20 @@ typedef enum {
 	KEY_ENTER        = 6,
 	KEY_NEXT         = 7,
 	KEY_NEXT_STACKED = 8,
-	KEY_CLOSE        = 9,
-	KEY_MIN          = 10,
-	KEY_MAX          = 11,
-	KEY_SHADE        = 12,
-	KEY_MOVE         = 13,
-	KEY_RESIZE       = 14,
-	KEY_ROOT         = 15,
-	KEY_WIN          = 16,
-	KEY_DESKTOP      = 17,
-	KEY_EXEC         = 18,
-	KEY_RESTART      = 19,
-	KEY_EXIT         = 20
+	KEY_PREV         = 9,
+	KEY_PREV_STACKED = 10,
+	KEY_CLOSE        = 11,
+	KEY_MIN          = 12,
+	KEY_MAX          = 13,
+	KEY_SHADE        = 14,
+	KEY_MOVE         = 15,
+	KEY_RESIZE       = 16,
+	KEY_ROOT         = 17,
+	KEY_WIN          = 18,
+	KEY_DESKTOP      = 19,
+	KEY_EXEC         = 20,
+	KEY_RESTART      = 21,
+	KEY_EXIT         = 22
 } KeyType;
 
 void InitializeKeys();
diff --git a/src/parse.c b/src/parse.c
index 5dd82af..023ae23 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -49,6 +49,8 @@ static const KeyMapType KEY_MAP[] = {
 	{ "select",      KEY_ENTER        },
 	{ "next",        KEY_NEXT         },
 	{ "nextstacked", KEY_NEXT_STACKED },
+	{ "prev",        KEY_PREV         },
+	{ "prevstacked", KEY_PREV_STACKED },
 	{ "close",       KEY_CLOSE        },
 	{ "minimize",    KEY_MIN          },
 	{ "maximize",    KEY_MAX          },
diff --git a/src/taskbar.c b/src/taskbar.c
index f8ab13c..c553652 100644
--- a/src/taskbar.c
+++ b/src/taskbar.c
@@ -699,6 +699,71 @@ void FocusNextStackedCircular() {
 
 }
 
+/***************************************************************************
+ ***************************************************************************/
+void FocusPreviousStackedCircular() {
+
+	ClientNode *ac;
+	ClientNode *np;
+	int x;
+
+	ac = GetActiveClient();
+	np = NULL;
+
+	/* Check for a valid client below this client in the same layer. */
+	if(ac) {
+		for(np = ac->prev; np; np = np->prev) {
+			if(ShouldFocusItem(np)) {
+				break;
+			}
+		}
+	}
+
+	/* Check for a valid client in upper layers. */
+	if(ac && !np) {
+		for(x = ac->state.layer + 1; x <= LAYER_TOP; x++) {
+			for(np = nodes[x]; np; np = np->next) {
+				if(!np->next) {
+					break;
+				}
+			}
+			for(; np; np = np->prev) {
+				if(ShouldFocusItem(np)) {
+					break;
+				}
+			}
+			if(np) {
+				break;
+			}
+		}
+	}
+
+
+	/* Revert to the bottom-most valid client. */
+	if(!np) {
+		for(x = LAYER_BOTTOM; x <= LAYER_TOP; x++) {
+			for(np = nodes[x]; np; np = np->next) {
+				if(!np->next) {
+					break;
+				}
+			}
+			for(; np; np = np->prev) {
+				if(ShouldFocusItem(np)) {
+					break;
+				}
+			}
+			if(np) {
+				break;
+			}
+		}
+	}
+
+	if(np) {
+		FocusClient(np);
+	}
+}
+
+
 /***************************************************************************
  ***************************************************************************/
 Node *GetNode(TaskBarType *bar, int x) {
diff --git a/src/taskbar.h b/src/taskbar.h
index e65600f..1ac330d 100644
--- a/src/taskbar.h
+++ b/src/taskbar.h
@@ -46,6 +46,9 @@ void FocusPrevious();
 /** Focus the next stacked client. */
 void FocusNextStackedCircular();
 
+/** Focus the previous stacked client. */
+void FocusPreviousStackedCircular();
+
 /** Set the maximum width of task bar items.
  * @param cp The task bar component.
  * @param value The maximum width.
-- 
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