From 2351421622f435a84dde96364c83b07a2c2339fe Mon Sep 17 00:00:00 2001
From: rkfg <rkfg@rkfg.me>
Date: Tue, 22 Jun 2021 16:34:41 +0300
Subject: [PATCH] Limit cursor movement in detail views

---
 ui/cursor/cursor.go     | 6 +++++-
 ui/views/channel.go     | 4 +++-
 ui/views/help.go        | 4 +++-
 ui/views/routing.go     | 3 +++
 ui/views/transaction.go | 4 +++-
 5 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/ui/cursor/cursor.go b/ui/cursor/cursor.go
index 0d5887c..8dac7e7 100644
--- a/ui/cursor/cursor.go
+++ b/ui/cursor/cursor.go
@@ -14,10 +14,14 @@ func Down(v View) error {
 		return nil
 	}
 	cx, cy := v.Cursor()
+	ox, oy := v.Origin()
 	_, _, sy, _ := v.Speed()
+	_, fs := v.Limits()
+	if cy+oy+sy >= fs {
+		return nil
+	}
 	err := v.SetCursor(cx, cy+sy)
 	if err != nil {
-		ox, oy := v.Origin()
 		err := v.SetOrigin(ox, oy+sy)
 		if err != nil {
 			return err
diff --git a/ui/views/channel.go b/ui/views/channel.go
index 13c5898..ac84e83 100644
--- a/ui/views/channel.go
+++ b/ui/views/channel.go
@@ -49,7 +49,9 @@ func (c Channel) Speed() (int, int, int, int) {
 }
 
 func (c Channel) Limits() (pageSize int, fullSize int) {
-	return 0, 0
+	_, pageSize = c.view.Size()
+	fullSize = len(c.view.BufferLines()) - 1
+	return
 }
 
 func (c *Channel) SetCursor(x, y int) error {
diff --git a/ui/views/help.go b/ui/views/help.go
index 3387ede..19a11be 100644
--- a/ui/views/help.go
+++ b/ui/views/help.go
@@ -43,7 +43,9 @@ func (h Help) Speed() (int, int, int, int) {
 }
 
 func (h Help) Limits() (pageSize int, fullSize int) {
-	return 0, 0
+	_, pageSize = h.view.Size()
+	fullSize = len(h.view.BufferLines()) - 1
+	return
 }
 
 func (h *Help) SetCursor(x, y int) error {
diff --git a/ui/views/routing.go b/ui/views/routing.go
index 2c0fa43..694ef6f 100644
--- a/ui/views/routing.go
+++ b/ui/views/routing.go
@@ -137,6 +137,9 @@ func (c *Routing) Speed() (int, int, int, int) {
 func (c *Routing) Limits() (pageSize int, fullSize int) {
 	_, pageSize = c.view.Size()
 	fullSize = len(c.routingEvents.Log)
+	if pageSize < fullSize {
+		fullSize = pageSize
+	}
 	return
 }
 
diff --git a/ui/views/transaction.go b/ui/views/transaction.go
index 257e016..62da79e 100644
--- a/ui/views/transaction.go
+++ b/ui/views/transaction.go
@@ -48,7 +48,9 @@ func (c Transaction) Speed() (int, int, int, int) {
 }
 
 func (c Transaction) Limits() (pageSize int, fullSize int) {
-	return 0, 0
+	_, pageSize = c.view.Size()
+	fullSize = len(c.view.BufferLines()) - 1
+	return
 }
 
 func (c *Transaction) SetCursor(x, y int) error {